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Sample records for akodon molinae rodentia

  1. Robertsonian chromosome polymorphism of Akodon molinae (Rodentia: Sigmodontinae: analysis of trivalents in meiotic prophase Polimorfismo cromosómico Robertsoniano de Akodon molinae (Rodentia: Sigmodontinae

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    RAÚL FERNÁNDEZ-DONOSO

    2001-03-01

    Full Text Available Akodon molinae (with 2n = 42-43-44 and an FN = 44 shows a remarkable polymorphism of chromosome 1 in natural and laboratory populations. Specimens 2n = 42, named single homozygotes (SH, have a chromosome pair 1 formed by two large metacentric chromosomes. Specimens 2n = 3, heterozygotes (Ht, have one chromosome 1 and two medium-sized subtelocentric chromosomes, 1a and 1b, which are homologous with the long and short arms of chromosome 1 respectively. Specimens 2n = 44 are double homozygotes (DH, with just two pairs of medium-sized subtelocentric chromosomes, 1a and 1b. Analysis of meiotic metaphases I and II showed that anomalous segregation occurs more frequently in spermatocytes carrying the 1a and 1b chromosomes. This would disturb gametogenesis and other reproductive and developmental processes, producing a marked decrease in viability of DH individuals. There is, as yet, no satisfactory explanation for these phenomena. To investigate structural elements which might explain such segregational anomalies, we have studied bivalent and trivalent synapsis in pachytene spermatocytes from SH, Ht and DH specimens. Of a total of 80 spermatocyte nuclei microspreads, the following results were obtained: of 16 microspreads from two SH individuals, 20 autosomic bivalents plus the XY bivalent were observed; of 48 microspreads from three Ht individuals, 19 autosomic bivalents, 1 trivalent and an XY bivalent were seen; and of the 16 microspreads from two DH individuals, 21 autosomic bivalents plus the XY bivalent were found. Trivalents analysed showed complete pairing between the short arms of 1a and 1b, and having an apparently normal synaptonemal complex (SC with lengths of 1 and 2.8 µm. The trivalent SC showed three telomeric ends, corresponding to arms: q1 and q1a; p1 and q1b; and p1a and p1b, with attachment plates to the nuclear envelope of normal organisation. None of the trivalents showed asynapsis or desynapsis between p1a and p1b, nor an

  2. Metabolic rates and thermoregulatory characteristics of Akodon azarae (Rodentia: Sigmodontinae Tasas metabólicas y características termorregulatorias de Akodon azarae (Rodentia: Sigmodontinae

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    C. DANIEL ANTINUCHI

    2000-03-01

    Full Text Available In this work, we evaluated the energetic status, activity daily metabolic rate, thermoregulatory capacity and the existence of torpor in Akodon azarae (Fisher 1829. Basal metabolic rate (BMR was similar to the expected value from Kleiber´s, and also according to the BMR of phylogenetically related species. No statistical difference in BMR between sexes was detected. For both males and females, activity daily metabolic rate was 235 % of BMR. Body temperature was not statistically different, neither at different ambient temperatures nor between sexes. In the thermoneutral zone, body temperature was 36.1 ± 1.5 °C. Thermal conductance was lower than the expected for mammals whereas thermoregulatory capacity was 136 % of the expected. Akodon azarae did not show evidence of torporEn este trabajo fueron evaluadas, para Akodon azarae (Fisher 1829, la tasa metabólica basal (BMR y de actividad diaria así como la capacidad termorregulatoria y la posible existencia de torpor. La BMR no presentó diferencias estadísticas con la esperada por la ecuación de Kleiber así como con la esperada para especies filogenéticamente relacionadas. Tampoco fueron detectadas diferencias significativas en la BMR entre sexos. La tasa metabólica de actividad diaria para ambos sexos fue el 235 % de la BMR. La temperatura corporal no presentó variaciones entre individuos mantenidos a diferentes temperaturas ambiente ni tampoco entre sexos y en termoneutralidad fue de 36,1 ± 1,5 °C. Por otra parte, la conductancia térmica fue menor a la esperada mientras que la capacidad termorregulatoria fue el 136% de la esperada. Akodon azarae no presenta sopor

  3. Chromosomal variation in Argentine populations of Akodon montensis Thomas, 1913 (Rodentia, Cricetidae, Sigmodontinae).

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    Malleret, Matías Maximiliano; Labaroni, Carolina Alicia; García, Gabriela Verónica; Ferro, Juan Martín; Martí, Dardo Andrea; Lanzone, Cecilia

    2016-01-01

    The genus Akodon Meyen, 1833 is one of the most species-rich among sigmodontine rodents and has great chromosome variability. Akodon montensis has a relatively broad distribution in South America, and Argentine populations are located in the southernmost region of its range. Brazilian populations have important chromosomal variability, but cytogenetic data from Argentina are scarce. We performed a chromosome characterization of natural populations of Akodon montensis using conventional staining, C-banding, Ag-NORs and base-specific fluorochromes. A total of 31 specimens from five localities of Misiones Province, in Argentina, were analyzed. The 2n=24 chromosomes was the most frequently observed karyotype. However, five individuals presented 25 chromosomes due to a supernumerary B-chromosome; and one individual had 2n=26 due to one B plus a trisomy for chromosome 11. Additionally, two XY females and two variants of the X chromosomes were found. C-positive centromeric bands occurred in all chromosomes; additional C-bands were observed in some autosomes, the X, Y and B chromosomes. Ag-NORs were observed in five autosomes, and the B chromosome was frequently marked. Fluorochrome banding was similar among karyotypes of the analyzed populations. Comparisons of cytogenetic data among populations of Argentina and Brazil showed the presence of high intraspecific variability in Akodon montensis and some differences among regions.

  4. Reproduction, development and growth of Akodon lindberghi (Hershkovitz, 1990 (Rodentia, Muridae, Sigmodontinae raised in captivity

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    V De Conto

    Full Text Available The reproduction, development and growth of Akodon lindberghi were studied in captivity. The colony was derived from animals captured in Simão Pereira, Minas Gerais state, which represents a new area of geographical distribution known for this species. Twelve males and twelve females were crossed, producing 144 young in 53 litters. Post-partum oestrus was observed and gestation length was estimated in 23 days. Litter size ranged from 1 to 4 with a mean of 2.72 (SD = 0.97, n = 53 and modal size of 3. Sexual dimorphism was neither present in body mass at birth nor at weaning. There was a significant negative correlation between litter size and mass at birth or weaning. Permanent emergence of adult external appearance occurred at 15 days. Puberty for males and females was 43 and 42 days, respectively, and the first fecundation event for two females was recorded at 47 and 54 days of age. The weight growth was described by fitting a Gompertz model. No significant difference was found in any parameter of growth curves for males and females. Measurements (head-body, tail, hind foot and internal and external ear lengths obtained for adult individuals also did not reveal the presence of sexual dimorphism.

  5. Ecology of the interaction between Ixodes loricatus (Acari: Ixodidae) and Akodon azarae (Rodentia: Criceridae).

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    Colombo, Valeria C; Nava, Santiago; Antoniazzi, Leandro R; Monje, Lucas D; Racca, Andrea L; Guglielmone, Alberto A; Beldomenico, Pablo M

    2015-10-01

    The present study explores associations of different factors (i.e. host parameters, presence of other ectoparasites and [mainly biotic] environmental factors) with burdens of Ixodes loricatus immature stages in one of its main hosts in Argentina, the rodent Akodon azarae. For 2 years, rodents were trapped and sampled monthly at 16 points located in four different sites in the Parana River Delta region. Data were analysed with generalized linear mixed models with a negative binomial response (counts of larvae or nymphs). The independent variables assessed were (a) environmental: trapping year, presence of cattle, type of vegetation, rodent abundance; (b) host parameters: body length, sex, body condition, blood cell counts, natural antibody titers and (c) co-infestation with other ectoparasites. Two-way interaction terms deemed a priori as relevant were also included in the analysis. Most of the associations investigated were found significant, but in general, the direction and magnitude of the associations were context-dependent. An exception was the presence of cattle, which was consistently negatively associated with both larvae and nymphs independently of all other variables considered and had the strongest effect on tick burdens. Mites, fleas and Amblyomma triste were also significantly associated (mostly positively) with larval and nymph burdens, and in many cases, they influenced associations with environmental or host factors. Our findings strongly support that raising cattle may have a substantial impact on the dynamics of I. loricatus and that interactions within the ectoparasite community may be an important-but generally ignored-driver of tick dynamics.

  6. Histopathology associated with angiostrongylosis in Akodon species (Rodentia: Sigmodontinae) from Sierra de la Ventana, Buenos Aires, Argentina.

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    Robles, María del Rosario; Perfumo, Carlos; Kinsella, John M; Navone, Graciela T

    2012-12-01

    Angiostrongylus is a metastrongylid nematode genus that includes species found in carnivores, rodents, and occasionally primates (including humans). About 100 species of wild sigmodontine rodents occur in Argentina, 16 of which are species of Akodon. The lungs of Akodon azarae and Akodon dolores from Sierra de la Ventana, Buenos Aires, Argentina, were examined, and 2 of 10 A. dolores specimens were positive for angiostrongylosis, showing macroscopic lesions of verminous pneumonia. Adults found were identified as Angiostrongylus morerai. Histopathology of the lungs revealed multiple nodules in the interstitium, alveoli, and vessels, resulting in interstitial fibrosis and the destruction of small capillaries and arterioles. Since extensive pathology in the lung was noted here from only 2 adults, it is probable that heavier infections may cause mortality in their hosts. This is the first record of this nematode species from A. dolores , expanding its geographic distribution to the southwest of Buenos Aires Province, and the first description of the histopathology of larval angiostrongylosis in a wild rodent from South America.

  7. Karyotypes of Akodon orophilus Osgood 1913 and Thomasomys sp. (Rodentia: Sigmodontinae from Huánuco, Peru

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    Víctor Pacheco

    2012-10-01

    Full Text Available Conventional chromosomal preparations were made of three native mice from Huánuco, Peru: a male and a female of Thomasomys sp., and a male of Akodon orophilus. Thomasomys sp. had a karyotype of 2n = 42, XY (n = 21, meanwhile A. orophilus presented 2n = 22, XY (n = 11. Comparisons between chromosomal pairs from the existent literature indicate that both are new karyotypes. Thomasomys sp. has a distinct sexual Y chromosome, the only metacentric (m reported for the genus. The chromosomes X and Y of A. orophilus are acrocentrics (a; and the length of chromosome Y (2/3 of the length of X distinguishes A. orophilus from other congeneric. Because the structural differences between the sexual chromosomes usually generates mechanism of reproductive isolation at intraspecific level and are bigger still in interspecific crosses, we concluded that the karyotypes reported here support the validity of the species A. orophilus and suggest that Thomasomys sp. represents a new species to science.

  8. Chromosome homologies of the highly rearranged karyotypes of four Akodon species (Rodentia, Cricetidae) resolved by reciprocal chromosome painting: the evolution of the lowest diploid number in rodents.

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    Ventura, Karen; O'Brien, Patricia C M; Yonenaga-Yassuda, Yatiyo; Ferguson-Smith, Malcolm A

    2009-01-01

    Traditionally comparative cytogenetic studies are based mainly on banding patterns. Nevertheless, when dealing with species with highly rearranged genomes, as in Akodon species, or with other highly divergent species, cytogenetic comparisons of banding patterns prove inadequate. Hence, comparative chromosome painting has become the method of choice for genome comparisons at the cytogenetic level since it allows complete chromosome probes of a species to be hybridized in situ onto chromosomes of other species, detecting homologous genomic regions between them. In the present study, we have explored the highly rearranged complements of the Akodon species using reciprocal chromosome painting through species-specific chromosome probes obtained by chromosome sorting. The results revealed complete homology among the complements of Akodon sp. n. (ASP), 2n = 10; Akodon cursor (ACU), 2n = 15; Akodon montensis (AMO), 2n = 24; and Akodon paranaensis (APA), 2n = 44, and extensive chromosome rearrangements have been detected within the species with high precision. Robertsonian and tandem rearrangements, pericentric inversions and/or centromere repositioning, paracentric inversion, translocations, insertions, and breakpoints, where chromosomal rearrangements, seen to be favorable, were observed. Chromosome painting using the APA set of 21 autosomes plus X and Y revealed eight syntenic segments that are shared with A. montensis, A. cursor, and ASP, and one syntenic segment shared by A. montensis and A. cursor plus five exclusive chromosome associations for A. cursor and six for ASP chromosome X, except for the heterochromatin region of ASP X, and even chromosome Y shared complete homology among the species. These data indicate that all those closely related species have experienced a recent extensive process of autosomal rearrangement in which, except for ASP, there is still complete conservation of sex chromosomes homologies.

  9. Ectoparasite occurrence associated with males and females of wild rodents Oligoryzomys flavescens (Waterhouse) and Akodon azarae (Fischer) (Rodentia: Cricetidae: Sigmodontinae) in the Punta Lara wetlands, Argentina.

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    Lareschi, Marcela

    2010-01-01

    The objective of this research was to study infestation parameters and indexes of ectoparasites associated with each sex of the wild rodents Oligoryzomys flavescens (Waterhouse) andAkodon azarae (Fischer) in the Punta Lara wetlands, Argentina. A trend towards higher mean abundance (MA) and ectoparasite specific richness was observed in males of O. flavescens whereas those values were similar for both A. azarae sexes. The prevalence of the following ectoparasites was significantly higher on males (Prodent hosts, these results are epidemiologically important.

  10. Laelapinae mites (Acari: Parasitiformes: Laelapidae) parasitic of sigmodontine rodents from northern Peru, with the description of a new species from Akodon aerosus (Rodentia: Cricetidae: Sigmodontinae).

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    Lareschi, Marcela; Velazco, Paúl M

    2013-04-01

    Laelapine mites are common parasites of sigmodontine rodents in the Neotropics. However, few species are reported from Peru as a result of the low number of mammal surveys that include ectoparasite collections. Herein we report 12 species of mites from northern Peru. From these, 8 are reported for the first time for the country, and 1 is new to science , Androlaepaps aerosus sp. nov., the latter associated exclusively with the sigmodontine Akodon aerosus . Most of the laelapine species were host specific. The new species, included in the Androlaelaps rotundus species group, resembles An. rotundus "sensu stricto" and An. ulysespardinasi in general appearance but is unique in the length of the hypostomal seta h3 (>58 μm), which is 3 times as long as the gnathosomal seta, and its tip reaching or over-reaching the gnathosomal setal bases; dorsal seta j2 is very long (>70 μm), almost reaching the point of j3.

  11. New species and records of the mite genus Prolistrophorus (Acariformes: Listrophoridae) from rodents of the subfamily Sigmodontinae (Rodentia: Cricetidae).

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    Bochkov, Andre V; Lareschi, Marcela; Barreto, Mauricio

    2014-10-01

    Six fur-mite species of the genus Prolistrophorus Fain, 1970 (Acariformes: Listrophoridae) were recorded from Central and South American rodents of the subfamily Sigmodontinae (Rodentia: Cricetidae). Among them, Prolistrophorus (Aprolistrophorus) parabidentatus sp. nov. from Akodon azarae from Argentina and Prolistrophorus (Aprolistrophorus) tylomys sp. nov. from Tylomys nudicaudus from Guatemala are described as new for science. New hosts are recorded for the following species: Prolistrophorus (Prolistrophorus) grassii (Radford, 1954) from Zygodontomys brevicauda from Colombia, P. (P.) frontalis (Hirst, 1921) from Oligoryzomys sp. from Argentina, P. (P.) argentinus (Hirst, 1921) from Melanomys caliginosus, Akodon affinis from Colombia and Scapteromys aquaticus from Argentina, Prolistrophorus (Beprolistrophorus) hirstianus Fain, 1973 from Scapteromys aquaticus from Argentina.

  12. 2016 AMS Mario J. Molina Symposium

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    Zhang, Renyi [Texas A & M Univ., College Station, TX (United States)

    2016-11-29

    A named symposium to honor Dr. Mario J. Molina was held 10–14 January 2016, as part of the 96th American Meteorological Society (AMS) Annual Meeting in New Orleans, Louisiana. Dr. Molina first demonstrated that industrially produced chlorofluorocarbons (CFCs) decompose in the stratosphere and release chlorine atoms, leading to catalytic ozone destruction. His research in stratospheric chemistry was instrumental to the establishment of the 1987 United Nations Montreal Protocol to ban ozone-depleting substances worldwide. Dr. Molina’s contributions to preserving the planet Earth not only save the atmospheric ozone layer, but also protect the climate by reducing the emissions of greenhouse gases. He was awarded the 1995 Nobel Prize in Chemistry for his pioneering research in understanding the stratospheric ozone loss mechanism. In 2013, President Barack Obama announced Dr. Molina as a recipient of the Presidential Medal of Freedom. The 2016 AMS Molina Symposium honored Dr. Molina’s distinguished contributions to research related to atmospheric chemistry. The symposium contained an integrated theme related to atmospheric chemistry, climate, and policy. Dr. Molina delivered a keynote speech at the Symposium. The conference included invited keynote speeches and invited and contributed oral and poster sessions, and a banquet was held on Tuesday January 12, 2016. The symposium covered all aspects of atmospheric chemistry, with topics including (1) Stratospheric chemistry, (2) Tropospheric chemistry, (3) Aerosol nucleation, growth, and transformation, (4) Aerosol properties, (5) Megacity air pollution, and (6) Atmospheric chemistry laboratory, field, and modeling studies. This DOE project supported 14 scientists, including graduate students, post docs, junior research scientists, and non-tenured assistant professors to attend this symposium.

  13. Detection of the first incidence of Akodon paranaensis naturally infected with the Jabora virus strain (Hantavirus in Brazil

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    Renata Carvalho de Oliveira

    2012-05-01

    Full Text Available We characterised hantaviruses circulating in different Akodon rodent species collected in midwestern Santa Catarina (SC, southern Brazil, where the Jabora hantavirus (JABV strain was first identified in Akodon montensis. Genetic and phylogenetic analyses based on a partial S segment indicated that, in SC, Akodon paranaensis and A. montensis carried the same type of hantavirus. Additionally, we conducted the first genomic characterisation of the complete S segment from the Brazilian JABV strain. This is the first report of A. paranaensis infected with the JABV.

  14. Multiple origins of XY female mice (genus Akodon): phylogenetic and chromosomal evidence.

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    Hoekstra, H. E.; Edwards, S.V.

    2000-01-01

    Despite the diversity in sex determination across organisms, theory predicts that the evolution of XY females is rare in mammals due to fitness consequences associated with infertility or the loss of YY zygotes. We investigated this hypothesis from a phylogenetic perspective by examining the inter- and intraspecific distribution of Y chromosomes in males and females (XY females) in South American field mice (Akodon). We found that XY females occurred at appreciable frequencies (10-66%) in at ...

  15. Gerardo Molina y el Estado providente

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    Cataño , Gonzalo

    2004-12-01

    Full Text Available En este ensayo Gonzalo Cataño examina la visión del Estado del notable pensador y dirigente socialista colombiano, Gerardo Molina. Ofrece una breve información biográfica y comenta su enfoque sobre las funciones del aparato estatal. Aunque en la exposición predomina un tono crítico, muestra que las limitaciones de un analista inteligente de los asuntos públicos son más instructivas que las consideraciones correctas de un comentarista trivial de la política. En este trabajo se denomina por Estado providente ¿conocido también como asistencial o de bienestar¿ al que garantiza niveles mínimos de ingreso, salud, alimentación, vivienda, educación y trabajo, como derecho político y no como beneficencia.

  16. DANGEROUS GAMES IN CARLOS DENIS MOLINA'S PLAYS

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    Braillon-Chantraine, Cécile

    2014-01-01

    International audience; De par son hyper réflexivité, l'oeuvre dramatique de l'écrivain uruguayen Carlos Denis Molina (1916-1983) constitue un témoignage des pratiques théâtrales de son époque et des mutations socio-économiques que traverse son pays, l'Uruguay, au cours du vingtième siècle. Le procédé méta théâtral du jeu, mettant en scène des personnages en train de se divertir et de jouer un rôle, est présent dans plusieurs de ses pièces, à chaque étape de sa production dramatique, et débou...

  17. Estudo do roedor Akodon arviculoides, Wagner, 1842 (Cricetidae: importância nos focos pestosos no Brasil The rodent Akodon arviculoides, Wagner, 1842 (Cricetidae: importance in plague focus of Brazil

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    Célio Rodrigues de Almeida

    1986-12-01

    Full Text Available Relata-se a ocorrência do roedor Akodon arviculoides (Wagner, 1842 no foco pestoso do Agreste pernambucano, sua capacidade de sobrevivência, reprodução e o desenvolvimento no cativeiro, a susceptibilidade à infecção pela Yersinia pestis e a importãncia desse roedor nos focos pestosos do Brasil.The occurrence of the rodent Akodon arviculoides Wagner, 1842 in the plague focus of the "Agreste" region of the State of Pernambuco and a report on its ability for survival, reproduction and development in captivity, its susceptibility to Yersinia pestis infection and the role of this rodent species in Brazilian plague foci are reported.

  18. Effects of high density on spacing behaviour and reproduction in Akodon azarae: A fencing experiment

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    Ávila, Belén; Bonatto, Florencia; Priotto, José; Steinmann, Andrea R.

    2016-01-01

    We studied the short term spacing behavioural responses of Pampean grassland mouse (Akodon azarae) with regard to population density in four 0.25 ha enclosures (two control and two experimental) in the 2011 breeding season. Based on the hypothesis that A. azarae breeding females exhibit spacing behaviour, and breeding males show a fusion spatial response, we tested the following predictions: (1) home range size and intrasexual overlap degree of females are independent of population density values; (2) at high population density, home range size of males decreases and the intrasexual home range overlap degree increases. To determine if female reproductive success decreases at high population density, we analyzed pregnancy rate, size and weight of litters, and period until fecundation in both low and high enclosure population density. We found that both males and females varied their home range size in relation to population density. Although male home ranges were always bigger than those of females in populations with high density, home range sizes of both sexes decreased. Females kept exclusive home ranges independent of density values meanwhile males decreased home range overlap in high breeding density populations. Although females produced litters of similar size in both treatments, weight of litter, pregnant rate and period until fecundation varied in relation to population density. Our results did not support the hypothesis that at high density females of A. azarae exhibit spacing behaviour neither that males exhibit a fusion spatial response.

  19. Paleozoogeography of the Wine Mouse (Akodon oenos & Late Holocene Paleoenvironments in South-Central Mendoza, Argentina

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    Fernando Julián Fernández

    2011-02-01

    Full Text Available Cranial remains of the wine mouse (Akodon oenos are documented from an archaeological site in south-central Mendoza, Argentina (Agua de La Mula, 35º22' S, 68º15' W, which dates to the end of the late Holocene (1610 ± 60; 1260 ± 60; 1000 ± 50 C14 yr B.P.. The taxonomic status of this small rodent is currently being assessed, but these remains represent the first fossil record for the morphotaxon A. oenos. The species’ present distribution is restricted to a few records from Mendoza province. Analysis of the remains supports paleoenvironmental reconstruction using the small mammal assemblage recovered from this site. From the late Holocene into modernity temperature decreased and winter precipitation increased, resulting in advance of Patagonian steppe grading with altitude into Monte desert. Holocene climatic conditions may explain the relatively late human occupation of ecologically marginal environments in this region, which probably favored effective human occupation of the Payunia region at sites such as Agua de La Mula between 1600 and 1000 years B.P.

  20. Variation in phenolic compounds of Ugni molinae populations and their potential use as antioxidant supplement

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    Marcia A. Avello

    2012-01-01

    Full Text Available In the present work we carried out a comparative study of total phenolic contents and antioxidant capacity of aqueous leaf extracts of Ugni molinae Turcz., Myrtaceae (infusion and Soxhlet extracted prepared from continent and Juan Fernández Island samples. The results revealed that total phenol content (TPC, tannins (TTC and flavonoids (TFC for U. molinae extracts (infusion and Soxhlet extracts from island leaves were 38.5, 56.7 and 37.5% higher than those obtained with leaves from the continent, respectively. Also, HPLC profiles showed important differences between U. molinae populations. In vitro antioxidant capacity (scavenging of DPPH radical for 1% infusion and aqueous extract (Soxhlet method of U. molinae from island samples, was 15% greater than from continent samples. Further, in vivo impact of U. molinae intake (1% infusion was studied in plasma samples obtained from healthy volunteers. Participants that consumed tea prepared with leaves from island population showed higher TBARS reduction and plasma antioxidant capacity (TEAC-CUPRAC than those who consumed tea prepared with leaves from continental population. The conditions of the territory in which U. molinae populations growth could explain the differences in their composition and activity. According to results, island U. molinae populations could be an important source of study for the development of an antioxidant supplement, and thereby contribute to the use of this species that has becoming an ecological problem in the island.

  1. Litter Decomposition of Acacia caven (Molina Molina and Lolium multiflorum Lam. in Mediterranean Climate Ecosystems Descomposición de Hojarascas de Acacia caven (Molina Molina y Lolium multiflorum Lam. en Ecosistemas de Clima Mediterráneo

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    Ingrid Martínez G

    2010-09-01

    Full Text Available The ecosystems of the Mediterranean interior dryland of Chile, dominated by an espinal agroecosystem of Acacia caven (Molina Molina, show low productivity as a result of soil degradation. The objective of this study was to evaluate litter decomposition of A. caven and Lolium multiflorum Lam. in espinal ecosystems: well preserved (Wp 50 to 80%, typical (Pd 25 to 50%, and degraded (De with 10 to 25% cover. During 420 d and starting in April 2004 until August 2005, weight loss in litter bags and chemical composition (hemicellulose, cellulose, lignin, non-structural components, ash, N, C, C/N ratio, and P were determined by using near infrared reflectance spectroscopy (NIRS and the Van Soest protocol. Weight loss ranged from 31 to 52% in L. multiflorum and 26 to 40% in A. caven after 420 d. During the chemical decomposition process of L. multiflorum, cellulose degradation was relevant in the labile phase while lignin was important in the recalcitrant phase. On the other hand, non-structural components and cellulose were degraded in the labile phase and lignin in the recalcitrant stage for A. caven. Moreover, both litters improved N concentration during the decomposition process. Espinal ecosystems with higher canopy cover (Pd and Wp had a positive influence, and showed early effects during the decomposition process, especially in the De espinal ecosystem, probably because of the microenvironmental conditions it generated. A better knowledge of the dynamics of litter decomposition in ecosystems was achieved by using both techniques: litter bags and NIRS.Los ecosistemas del secano interior mediterráneo de Chile presentan una baja productividad debido a la degradación de los suelos, dominados por un agroecosistema espinal de Acacia caven (Molina Molina. El objetivo de este estudio fue evaluar la descomposición de hojarascas de A. caven y Lolium multiflorum Lam., en ecosistemas espinales: densos (Wp con cobertura de 50-80%, poco densos (Pd 25-50% y

  2. JEUX DANGEREUX DANS LE THEATRE DE CARLOS DENIS MOLINA?

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    Braillon-Chantraine, Cécile

    2014-01-01

    International audience; De par son hyper réflexivité, l'oeuvre dramatique de l'écrivain uruguayen Carlos Denis Molina (1916-1983) constitue un témoignage des pratiques théâtrales de son époque et des mutations socio-économiques que traverse son pays, l'Uruguay, au cours du vingtième siècle. Le procédé méta théâtral du jeu, mettant en scène des personnages en train de se divertir et de jouer un rôle, est présent dans plusieurs de ses pièces, à chaque étape de sa production dramatique, et débou...

  3. Ultrasonically enhanced extraction of bioactive principles from Quillaja Saponaria Molina.

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    Gaete-Garretón, L; Vargas-Hernández, Yolanda; Cares-Pacheco, María G; Sainz, Javier; Alarcón, John

    2011-07-01

    A study of ultrasonic enhancement in the extraction of bioactive principles from Quillaja Saponaria Molina (Quillay) is presented. The effects influencing the extraction process were studied through a two-level factorial design. The effects considered in the experimental design were: granulometry, extraction time, acoustic Power, raw matter/solvent ratio (concentration) and acoustic impedance. It was found that for aqueous extraction the main factors affecting the ultrasonically-assisted process were: granulometry, raw matter/solvent ratio and extraction time. The extraction ratio was increased by Ultrasonics effect and a reduction in extraction time was verified without any influence in the product quality. In addition the process can be carried out at lower temperatures than the conventional method. As the process developed uses chips from the branches of trees, and not only the bark, this research contributes to make the saponin exploitation process a sustainable industry.

  4. Noticia preliminar de los grabados de la Peña Escrita (Canales de Molina, Guadalajara

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    María Luisa CERDEÑO

    2009-10-01

    Full Text Available La Peña Escrita está situada en el término de Canales de Molina, a escasos kilómetrros de Molina de Aragón al noreste de la provincia de Guadalajara. El paraje lo componen una serie de afloramientos de rocas calizas entre las que discurre el arroyo de la Dehesa que poco después, aguas abajo, desemboca en el río Gallo, afluente del Tajo.

  5. La ficción de Iván Molina Jiménez (Science Fiction by Iván Molina Jiménez

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    Roy Alfaro Vargas

    2014-11-01

    Full Text Available El estudio analiza la narrativa de ciencia ficción de Iván Molina Jiménez, a partir de un cuerpo teórico para abordar el análisis y la producción literaria de ciencia ficción, desde una adecuada poiesis. Se plantean los principios alrededor de la noción de novum, para la producción literaria de este tipo. Luego, se analizan algunos textos de ciencia ficción de Molina, y se muestran deficiencias de tal producción para así iniciar la construcción de las bases de la ciencia ficción costarricense. This article analyzes the tales of science fiction by Iván Molina Jiménez using a theoretical framework which makes it possible to address the literary production of science fiction, from the perspective of an adequate poiesis. The necessary principles based on the notion of novum are proposed for this genre. Then, some texts of science fiction by Iván Molina are analyzed, indicating certain deficiencies in order to begin the construction of the basis of the Costa Rican science fiction.

  6. Microhabitat characteristics of Akodon montensis, a reservoir for hantavirus, and hantaviral seroprevalence in an Atlantic forest site in eastern Paraguay.

    Science.gov (United States)

    Goodin, Douglas G; Paige, Robert; Owen, Robert D; Ghimire, Kabita; Koch, David E; Chu, Yong-Kyu; Jonsson, Colleen B

    2009-06-01

    Hantaviruses may cause serious disease when transmitted to humans by their rodent hosts. Since their emergence in the Americas in 1993, there have been extensive efforts to understand the role of environmental factors on the presence of these viruses in their host rodent populations. HPS outbreaks have been linked to precipitation, but climatic factors alone have not been sufficient to predict the spatial-temporal dynamics of the environment-reservoir-virus system. Using a series of mark-recapture sampling sites located at the Mbaracayú Biosphere Reserve, an Atlantic Forest site in eastern Paraguay, we investigated the hypothesis that microhabitat might also influence the prevalence of Jaborá hantavirus within populations of its reservoir species, Akodon montensis. Seven trapping sessions were conducted during 2005-2006 at four sites chosen to capture variable microhabitat conditions within the study site. Analysis of microhabitat preferences showed that A. montensis preferred areas with little forest overstory and denser vegetation cover on and near the ground. Moreover, there was a significant difference in the microhabitat occupied by antibody-positive vs antibody-negative rodents, indicating that microhabitats with greater overstory cover may promote transmission and maintenance of hantavirus in A. montensis.

  7. Muridae (Rodentia) from the lower Turolian of Crevillente (Alicante, Spain)

    NARCIS (Netherlands)

    Martín Suárez, E.; Freudenthal, M.

    1993-01-01

    The fauna of Muridae (Rodentia) from the Lower Turolian of Crevillente (Alicante, SE Spain) contains species attributed to the genera Huerzelerimys, Parapodemus, and Occitanomys. The material described allows a detailed biostratigraphy of Upper Miocene deposits of SE Spain. En este trabajo se estudi

  8. Late Miocene Sciuridae (Mammalia, Rodentia) from Anatolia, Turkey

    NARCIS (Netherlands)

    Bosma, A.A.; de Bruijn, H.; Wessels, W.

    2013-01-01

    Isolated cheek teeth of Sciuridae (Rodentia, Mammalia) from nine late Miocene localities in central Anatolia (Turkey) are described. The teeth represent at least 12 different species, five of which belong to the ground squirrel genus Tamias, two to the ground squirrel genus Spermophilinus, one to th

  9. Ultrasonically assisted extraction of bioactive principles from Quillaja Saponaria Molina

    Science.gov (United States)

    Cares, M. G.; Vargas, Y.; Gaete, L.; Sainz, J.; Alarcón, J.

    2010-01-01

    A study of ultrasonically assisted extraction of bioactive principles from Quillaja Saponaria Molina (Quillay) is presented. To address the problem it was studied the effects that could influence the extraction process through a two-level Factorial Design. The effects considered in the Experimental Design were: Granulometry, Extraction time, Acoustic Power and Acoustic Impedance. The production of the quillaja extracts is done with an aqueous extraction and the process is assisted by an ultrasonic field; no other solvents are used in its production. The final product only incorporates natural ingredients and raw materials, authorized for their use in food manufacturing processes. The principal factors affecting the ultrasonic extraction process were: Granulometry and Extraction time. The enhanced of ultrasonic assisted extraction ratio was measuring the increasing yield of extracted components, the extraction ratio was increased by ultrasonic effect and a reduction in extraction time was verified. In addition the process can be carried out at temperatures lower than the traditional way. The influence of ultrasound on the quality of bioactive principles was examined by HPLC technique and no influence of ultrasound on natural components was found.

  10. La mujer como sujeto: Josefina Molina en la Escuela Oficial de Cine

    OpenAIRE

    Deltell Escolar, Luis

    2015-01-01

    Josefina Molina es la primera mujer diplomada en Dirección Cinematográfica en la Escuela Oficial de Cine de España (E.O.C.). Fue una de las primeras realizadoras televisivas incorporadas a la T.V.E. Durante toda su carrera artística, ha sido una pione

  11. «Héctor Molina Riaño»

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    Yanoy Morejón Mesa

    2008-01-01

    Full Text Available El presente trabajo se realizó en los campos pertenecientes a la Empresa Azucarera «Héctor Molina Riaño», con el objetivo de desarrollar una metodología que permita realizar una evaluación energética y económica durante la recogida y transportación de los residuos agrícolas cañeros (RAC hasta la industria, partiendo de la determinación de los volúmenes de RAC, en campos cosechados con máquinas CAMECO y en el centro de limpieza. Para esto se utilizaron utensilios e instrumentos reglamentados por las normas de medición y control de la calidad. El valor de los RAC quedados en el campo ascendió a 3,87 t/ha, que pueden ser recogidos y transportados para producir energía y el índice de RAC para estas condiciones fue de 0,11. El volumen total de RAC a transportar desde el campo alcanzó 26 524,74 t y desde el centro de limpieza alcanzó 28 051,70 t. Según criterios planteados por diversos autores se realizó la evaluación energética de la recogida y transportación de los RAC hasta la industria, obteniéndose una energía requerida total de 680 478,34 Mcal y la energía que se puede producir con los RAC recogidos y transportado s es de 256 509 268 Mcal. También se realizó la evaluación económica, obteniéndose un gasto económico total de 411 256,27 pesos, costo de la energía producida de 909 607 pesos, con un costo unitario de 7,53 peso/t de RAC recogido y transportado y 16,66 peso/t de RAC utilizados en la generación de energía. Con estos resultados se evidencia que es factible el uso de los RAC como combustible alternativo en el sector azucarero.

  12. Acariform mites (Acariformes - permanent symbionts of Hapalomys delacouri Thomas (Rodentia, Muridae in Vietnam

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    Andre Bochkov

    2014-12-01

    Full Text Available Two new species of parasitic acariform mites (Acariformes are described from the Delacour’s marmoset rat Hapalomys delacouri Thomas (Rodentia: Muridae in Vietnam: Afrolistrophorus (Afrolistrophorus hapalomys sp. n. (Listrophoridae and Radfordia (Radfordia mirabilis sp. n. (Myobiidae. Based on morphological evidences, we show that species of both mite genera associated with Hapalomys Blyth do not demonstrate clear phylogenetic links with respective congeners from rodents of the closest genus Chiropodomys Peters (Rodentia: Muridae.

  13. Amores intertextuales y parodias posmodernistas: Vicente Molina Foix y la poesía

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    Gala, Candelas

    2010-12-01

    Full Text Available Taking as a point of departure the two poetry books, Los espías del realista y Vanas penas de amor, that Vicente Molina Foix published in 1990 and 1998, respectively, this essay analyzes the role of the ironic glance the poetic speaker casts on the literary, artistic and cultural models firmly rooted in the analytical-referential system of tradition. A careful reading of specific poems from both collections reveals Molina Foix’s use of parodic and inter-textual strategies to debunk the monumentality of such discourses, not so much to ridicule or do away with them, but to show their incongruence in the modern context and at the level of the individual person.Tomando como punto de partida los dos libros de poesía, Los espías del realista y Vanas penas de amor, que Vicente Molina Foix publica en 1990 y 1998, respectivamente, este ensayo analiza el papel de la mirada irónica que el hablante poético dirige a los modelos literarios, artísticos y culturales sólidamente establecidos en el sistema analítico y referencial de la tradición. La lectura atenta de poemas específicos procedentes de ambas colecciones revela el uso que hace Molina Foix de estrategias paródicas e intertextuales para desbancar la monumentalidad de dichos discursos con el fin no tanto de descartarlos y ridiculizarlos, sino más bien de mostrar su incongruencia en el contexto moderno y a nivel de la persona individual.

  14. El “Mundus Subterraneus” de Juan Ignacio Molina o el geólogo como economista

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    Orrego G., Francisco

    2015-12-01

    Full Text Available In general, the work of the Chilean ex Jesuit Juan Ignacio Molina (1740-1829 has not been studied under the light of history of geology. This article attempts to reconstruct the origin and morphology of the ideas in which the Chilean naturalist developed about the internal structure of the Earth. We will see how the geological ideas elaborated by Molina went beyond the scientific reflection. The development of a particular discipline as political economy during the eighteenth century also influenced Juan Ignacio Molina´s thoughts about the internal organization of the Earth, geological processes and the descriptions of the nature of Chilean kingdom in the late eighteenth century.En general, la obra del ex jesuita chileno Juan Ignacio Molina (1740-1829 no ha sido estudiada con profundidad a la luz de la historia de la geología. Este artículo reconstruye el origen y la morfología de parte de las ideas que el naturalista chileno elaboró sobre la estructura interna de la Tierra. Se verá cómo las ideas geológicas desarrolladas por Molina fueron más allá de la simple reflexión científica. El desarrollo de una disciplina particular y novedosa como la economía política, también influyó en el tipo de reflexiones que Juan Ignacio Molina desarrolló sobre la organización interior de la Tierra, los procesos geológicos y las descripciones sobre la naturaleza del Reino de Chile a fines del siglo XVIII.

  15. Domestication in Murtilla (Ugni molinae) Reduced Defensive Flavonol Levels but Increased Resistance Against a Native Herbivorous Insect.

    Science.gov (United States)

    Chacón-Fuentes, Manuel; Parra, Leonardo; Rodriguez-Saona, Cesar; Seguel, Ivette; Ceballos, Ricardo; Quiroz, Andres

    2015-06-01

    Plant domestication can have negative consequences for defensive traits against herbivores, potentially reducing the levels of chemical defenses in plants and consequently their resistance against herbivores. We characterized and quantified the defensive flavonols from multiple cultivated ecotypes with wild ancestors of murtilla, Ugni molinae Turcz, an endemic plant from Chile, at different times of the year, and examined their effects on a native insect herbivore, Chilesia rudis Butler (Lepidoptera: Arctiidae). We hypothesized that domestication results in a decrease in flavonol levels in U. molinae plants, and that this negatively affected C. rudis performance and preference. Ethanolic extracts were made from leaves, stems, and fruit of murtilla plants for flavonol analysis. Flavonols identified were kaempferol, quercetin, rutin, and quercetin 3-D-β-glucoside, the last two being the most abundant. More interestingly, we showed differences in flavonol composition between wild and cultivated U. molinae that persisted for most of the year. Relative amounts of all four flavonols were higher in wild U. molinae leaves; however, no differences were found in the stem and fruit between wild and cultivated plants. In choice and no-choice assays, C. rudis larvae gained more mass on, and consumed more leaf material of, wild as compared with cultivated U. molinae plants. Moreover, when applied to leaves, larvae ate more leaf material with increasing concentrations of each flavonol compound. Our study demonstrates that domestication in U. molinae reduced the amount of flavonols in leaves as well as the performance and preference of C. rudis, indicating that these compounds stimulate feeding of C. rudis.

  16. Paralelismos y divergencias entre Juan Tenorio de Tirso de Molina y Miguel Páramo, personaje de Juan Rulfo.

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    Herlinda Ramírez-Barradas.

    2009-01-01

    Full Text Available Resumen: En este breve artículo se presentan algunas características de Miguel Páramo que, primero, permiten incluirlo en la larga lista de personajes donjuanescos derivados de la obra de Tirso de Molina y que, además, hacen posible entender su función trágica.Summary: This article presents some of Miguel Páramo's characteristics that, first, allow including him in the long list of prominent Don Juan figures derived from Tirso de Molina's work and, in addition, make it possible to understand his tragic function.

  17. Intoxicación por bromuro de metilo en la Universidad Nacional Agraria la Molina

    OpenAIRE

    Erazo Ramirez, Arturo; Rodríguez Espinosa, Félix

    2004-01-01

    El 21 de setiembre del presente, el Centro Nacional de Salud Ocupacional y Protección del Medio Ambiente (CENSOPAS) del INS es notificado por la Dirección General de Salud Ambiental (DIGESA) sobre la fuga de bromuro de metilo, ocurrido el 20 de setiembre en la Facultad de Industrias Alimentarias de la Universidad Nacional Agraria de La Molina. Un equipo conformado por técnicos de CENSOPAS y de DIGESA realizó la investigación de campo, entrevistaron a las autoridades, profesores, trabaja...

  18. Articulismo en democracia. Las columnas de Antonio Muñoz Molina

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    Natalia Corbellini

    2008-11-01

    Full Text Available The writer's column format related to Muñoz Molina's last novels (Sefarad. Una novela de novelas; Ventanas de Manhattan; Días de diario , where the concept of genre is not clear, they alternate narrative and argumentation, tales and essay. I will analyze the writing of published columns as "Ida y vuelta" in the suplement Babelia of El país, as a format that allows experimentation with the language and the narrator; and simultaneously constructs an ego with the will of style, and for providing a rewatching form of knowledge and thought

  19. Actividad insecticida del polvo de Peumus boldus Molina (Monimiaceae) contra Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae).

    OpenAIRE

    Pizarro, Diana; Gonzalo SILVA; Tapia,Maritza; J. Concepción RODRÍGUEZ; Angélica URBINA; Angel LAGUNES; Candelario SANTILLÁN-ORTEGA; Agustín ROBLES-BERMÚDEZ; Sotero AGUILAR-MEDEL

    2013-01-01

    Se evaluaron las propiedades insecticidas del polvo de follaje de Peumus boldus Molina para el control de adultos y estados inmaduros de S. zeamais. La mayor toxicidad por contacto y fumigación se obtuvo con las concentraciones iguales o mayores a 1,25% registrando una mortalidad superior a 90%. Los tratamientos con mayor mortalidad mostraron también una baja emergencia de insectos adultos (F 1) y menor pérdida de peso del grano. En el control de estados inmaduros la menor F1 se observó en la...

  20. The geological perspective of Italy and Chile by Abbot Juan Ignacio Molina between the 18th and 19th centuries La perspectiva geolgica del Abate Juan Ignacio Molina sobre Italia y Chile entre los siglos XVIII y XIX

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    Marco Menichetti

    2011-09-01

    Full Text Available The first geological observations in Chile can be traced to Juan Ignacio Molina, a Jesuit priest who was born in 1740 in Chile and died in 1829 in Bologna, Italy. He received a scholarship education with a strong leaning towards philosophy, the humanities and the sciences at the Jesuit College in Concepcion. In 1767, when all the Jesuits were expelled from Chile and the spanish colonies, he took refuge in Italy, first in Imola and then in Bologna where he taught Greek at the University and later natural sciences at the Archiginnasio. During his stay in Bologna at the end of the 18th century, the Jesuit community continued to play an important role in the teaching of the sciences in spite of the Napoleonic occupation. In Bologna, as early as the 16th century, Ulisse Aldrovandi was developing new concepts in geology with his study and systematic collection of fossils. At the beginning of the 18th century, the naturalist and oceanographer L.F. Marsili and one of the fathers of paleontology, G. Monti, built of Aldrovandi's work and contributed to the growth of the Science Institute and the Natural History Museum in the city. It was in this cultural context that in 1782 Molina published in Italian language the Saggio sulla storia naturale del Chile. The book was divided into four chapters, the first two of which dealt with the earth sciences. In this work Molina repeatedly compares the north-south stretched landscapes, the volcanic activity and the geology of Italy and Chile. His next work, Memorie di storia naturale, was published in 1821 and was based on several lectures given by him at the Bologna Academy of Sciences. It contained fourteen Memoria -lectures- referred to different aspects of the natural sciences and six covered geological topics. In 1815, one of Molina's lectures -later Memoria XIV-, was published under the title Less noticed analogies in three kingdom of nature. In this lecture Molina discussed the similarities between minerals

  1. Phenolic compounds and antioxidant activity of hydroalcoholic extracts of wild and cultivated murtilla (Ugni molinae Turcz.

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    Thalita Riquelme Augusto

    2014-12-01

    Full Text Available Over the last decade a considerable increase in the number of studies addressing the use of antioxidants from natural sources has led to the identification and understanding of the potential mechanisms of biologically active components. This results from the fact that they can be used to replace synthetic antioxidants commonly used in food. Murtilla (Ugni molinae Turcz is a native berry grown in Chile, and in the present study, the phenolic composition and antioxidant activity of its fruits were studied. Hydroalcoholic extracts of dehydrated fruits from two genotypes of murtilla (Ugni molinae Turcz. were produced. Extracts of wild murtilla and 14-4 genotype fruits had 19.35 and 40.28mg GAE/g for Total Phenolic Compounds, 76.48, and 134.35μmol TEAC/g for DPPH, and 157.04 and 293.99 μmol TEAC/g for ABTS, respectively. Components such as quercetin, epicatechin, and gallic, benzoic and hydrocaffeic acids were identified by CG/MS analysis. All of them showed antioxidant activity. Therefore, it is possible to say that the hydroalcoholic extracts of murtilla have antioxidant potential to be used in lipidic food.

  2. Neoclásica y disidente: La Fábula de Polifemo de Francisco Nieto Molina

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    Bonilla Cerezo, Rafael

    2012-06-01

    Full Text Available This article revives the figure of a mid-seventeenth century forgotten ingenious from Cadiz: Francisco Nieto Molina. I try to place him in the central literary debates of the Enlightenment: gongorism trail and Lope de Vega’s tragicomedy. I edit his Fábula de Polifemo («No anuncios de Jano», included in El Fabulero (1764, with a comprehensive analysis. Lastly, I illuminate, through this little romance, both the footsteps of the great poet from Cordoba as well as the keys that make Nieto a «dissident neoclassic».Este artículo resucita la figura de un olvidado ingenio gaditano de mediados del XVIII: Francisco Nieto Molina. Procuro ubicarlo en los principales debates literarios de la Ilustración: la estela del gongorismo y la tragicomedia lopista. Edito con amplio comentario su Fábula de Polifemo («No anuncios de Jano», incluida en El Fabulero (1764. Ilumino, por último, en virtud de este romancillo, tanto las huellas del poeta cordobés como las claves que convierten a Nieto en un «neoclásico disidente».

  3. Toxicity of Boldo Peumus boldus Molina for Sitophilus zeamais Motschulsky and Tribolium castaneum Herbst Toxicidad del Boldo, Peumus boldus Molina, sobre Sitophilus zeamais Motschulsky y Tribolium castaneum Herbst

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    Margarita Ortiz U

    2012-09-01

    Full Text Available The maize weevil (Sitophilus zeamais Motschulsky and the red flour beetle (Tribolium castaneum Herbst are two key pests of stored-grain products worldwide. The insecticidal activity of boldo (Peumus boldus Molina powder, liquid ethanolic and hexanic extracts against S. zeamais and T. castaneum were evaluated under laboratory conditions. The evaluated variables were mortality, emergence of adult insects (F1, and grain weight loss. The experimental design was completely randomized. The mortality in S. zeamais was 100% even at the lowest powder concentration (0.5% w/w, whereas emergence of F1 adult insects was 0% and grain weight loss was El gorgojo del maíz (Sitophilus zeamais Motschulsky y el gorgojo castaño de la harina (Tribolium castaneum Herbst son plagas primarias de productos almacenados a nivel mundial. Se evaluó en laboratorio la actividad insecticida de polvo y extractos líquidos etanólicos y hexánicos del boldo (Peumus boldus Molina sobre S. zeamais y T. castaneum. Las variables evaluadas fueron mortalidad y emergencia de insectos adultos (F1 y pérdida de peso de los granos con un diseño experimental completamente al azar. La mortalidad en S. zeamais fue 100%, incluso con la concentración menor (0,5% p/p mientras que la emergencia de insectos adultos y la pérdida de peso de granos de maíz fue < 0,08%. Para T. castaneum sólo las concentraciones de 8 y 16% p/p de polvo causaron una mortalidad de 100%. Los extractos en agua, etanol, y hexano tuvieron un efecto insecticida de 100% en S. zeamais, mientras que en T. castaneum sólo el extracto en etanol alcanzó este valor. Por lo tanto, el polvo y los extractos evaluados de P. boldus presentan actividad insecticida contra S. zeamais y T. castaneum y son promisorios para utilizarse contra éstas y otras plagas de granos almacenados.

  4. Insecticidal Activity of Peumus boldus Molina Essential Oil against Sitophilus zeamais Motschulsky Actividad Insecticida del Aceite Esencial de Peumus boldus Molina sobre Sitophilus zeamais Motschulsky

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    Jessica Betancur R

    2010-09-01

    Full Text Available In stored grains, the main agents diminishing production are insects, which can produce losses between 20% and 80% before harvest or under storage. The insecticidal properties of the essential oil of fresh leaves of Peumus boldus Molina against maize weevil (Sitophilus zeamais Motschulsky adults were determined under laboratory conditions. The highest mortality (100% was achieved at 4% concentration by contact with a treated glass surface. The same concentration in impregnated corn (Zea mays L. grain, resulted in 98.7% mortality. Mortality by fumigant action at 6 h was 100% with 35 µL oil in 0.15 L (air volume. Concentrations 1, 2 and 4% of essential oil produced 0% F1 adult emergence. At 10 d of residual effect, the 4% concentration reached 63.7% mortality. All treatments were repellent to adults of S. zeamais and corn grain germination was not affected by any treatment.Los principales agentes que disminuyen la producción en los granos almacenados son los insectos, antes de la cosecha y en el almacenamiento pueden causar pérdidas de 20 a 80%. Se evaluaron las propiedades insecticidas del aceite esencial de hojas frescas de Peumus boldus Molina para el control de adultos de gorgojo del maíz (Sitophilus zeamais Motschulsky en laboratorio. La mayor mortalidad (100% por contacto con una superficie de vidrio tratada se obtuvo con la concentración de 4%. Esta misma concentración produjo 98,7% de mortalidad en exposición a grano de maíz (Zea mays L. tratado. El efecto fumigante a las 6 h de exposición fue 100% con 35 µL de aceite en 0,15 L (volumen de aire. Con las concentraciones de 1, 2 y 4% de aceite esencial, el porcentaje de emergencia de la F1 fue 0%. A los 10 d de efecto residual se alcanzó 63,7% de mortalidad con la concentración de 4%. Todos los tratamientos fueron repelentes para adultos de S. zeamais y ningún tratamiento afectó la germinación de los granos.

  5. Clues on Syntenic Relationship among Some Species of Oryzomyini and Akodontini Tribes (Rodentia: Sigmodontinae)

    Science.gov (United States)

    Suárez, Pablo; Nagamachi, Cleusa Yoshiko; Lanzone, Cecilia; Malleret, Matias Maximiliano; O’Brien, Patricia Caroline Mary; Ferguson-Smith, Malcolm Andrew; Pieczarka, Julio Cesar

    2015-01-01

    Sigmodontinae rodents represent one of the most diverse and complex components of the mammalian fauna of South America. Among them most species belongs to Oryzomyini and Akodontini tribes. The highly specific diversification observed in both tribes is characterized by diploid complements, which vary from 2n = 10 to 86. Given this diversity, a consistent hypothesis about the origin and evolution of chromosomes depends on the correct establishment of synteny analyzed in a suitable phylogenetic framework. The chromosome painting technique has been particularly useful for identifying chromosomal synteny. In order to extend our knowledge of the homeological relationships between Akodontini and Oryzomyini species, we analyzed the species Akodon montensis (2n = 24) and Thaptomys nigrita (2n = 52) both from the tribe Akodontini, with chromosome probes of Hylaeamys megacephalus (2n = 54) of the tribe Oryzomyini. The results indicate that at least 12 of the 26 autosomes of H. megacephalus show conserved synteny in A. montensis and 14 in T. nigrita. The karyotype of Akodon montensis, as well as some species of the Akodon cursor species group, results from many chromosomal fusions and therefore the syntenic associations observed probably represent synapomorphies. Our finding of a set of such associations revealed by H. megacephalus chromosome probes (6/21; 3/25; 11/16/17; and, 14/19) provides phylogenetic information for both tribes. An extension of these observations to other members of Akodontini and Oryzomyini tribes should improve our knowledge about chromosome evolution in both these groups. PMID:26642204

  6. Clues on Syntenic Relationship among Some Species of Oryzomyini and Akodontini Tribes (Rodentia: Sigmodontinae.

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    Pablo Suárez

    Full Text Available Sigmodontinae rodents represent one of the most diverse and complex components of the mammalian fauna of South America. Among them most species belongs to Oryzomyini and Akodontini tribes. The highly specific diversification observed in both tribes is characterized by diploid complements, which vary from 2n = 10 to 86. Given this diversity, a consistent hypothesis about the origin and evolution of chromosomes depends on the correct establishment of synteny analyzed in a suitable phylogenetic framework. The chromosome painting technique has been particularly useful for identifying chromosomal synteny. In order to extend our knowledge of the homeological relationships between Akodontini and Oryzomyini species, we analyzed the species Akodon montensis (2n = 24 and Thaptomys nigrita (2n = 52 both from the tribe Akodontini, with chromosome probes of Hylaeamys megacephalus (2n = 54 of the tribe Oryzomyini. The results indicate that at least 12 of the 26 autosomes of H. megacephalus show conserved synteny in A. montensis and 14 in T. nigrita. The karyotype of Akodon montensis, as well as some species of the Akodon cursor species group, results from many chromosomal fusions and therefore the syntenic associations observed probably represent synapomorphies. Our finding of a set of such associations revealed by H. megacephalus chromosome probes (6/21; 3/25; 11/16/17; and, 14/19 provides phylogenetic information for both tribes. An extension of these observations to other members of Akodontini and Oryzomyini tribes should improve our knowledge about chromosome evolution in both these groups.

  7. Tirso de Molina: the Dramatist in the Crisis of the Succession of 1621

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    Alan K.G. Paterson

    2016-11-01

    Full Text Available The crisis is the political upheaval that accompanied the ascent of Olivares to power. Its repercussions on the religious and literary career of Fr. Gabriel Téllez/Tirso de Molina are examined. The primary documents analysed include the two passages in Téllez’s Historia de la Orden de la Merced (one from the early 1630s. the other revised towards the end of the decade containing his hostile criticism of the struggle between the two groups, Lerma’s associates and those of Olivares. This hostility relates to the sentence issued by the Junta de Reformación (1625 and to be meted out as its response to the notorious case of Fr. Gabriel Téllez oka Tirso de Molina, etc. This connection confirms our seeing Tirso as a notable political victim. Yet in the thirties, Tirso’s position is complex. To offset the clear indications of a major if not terminal disruption to his activity as dramatist, the circumstances attendant on the Parte tercera de las comedias (1634 are examined to show how Fr. Gabriel came to the defence of his creation Tirso de Molina, by ensuring his survival in print. The text of the Junta’s sentence informs us of the reason its judges had to silence the dramatist; it concerns his writing plays which are profane and give bad examples. This information invites us to ask to which plays can the harsh sentence of the Junta refer? The reply to this question forms the main theme of the study. It is argued that La venganza de Tamar is a work seriously involved in the turbulent politics of the succession. This argument is preceded by an essential study on the text as authorized by Tirso and subject to the editorial scrutiny of Lucas de Avila. The nexus of images referring to physical hunger that develops into sexual and political hunger is coordinated with the recurring image of the body, presented in a series of progressively morbid pathological states. The human body receives focus in a spectacular way, as a conspicuous object on

  8. Los realismos en Beatus Ille de Antonio Muñoz Molina.

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    Papa Mamour Diop

    2007-07-01

    Full Text Available ENGLISH: This work deals with the current debate about reality and its literary and artistic expression: realism. In Beatus Ille, Antonio Muñoz Molina’s first novel, the fictional universe reveals three kinds of realism: the epic and elegiac realism, the historic realismand the magic realism. SPANISH: En este trabajo, abordamos el actual debate sobre la realidad y su expresión literaria y artística: el realismo. En Beatus Ille, primera novela de Antonio Muñoz Molina, eluniverso novelesco permite percibir tres tipos de realismos: el realismo épico elegiaco, el realismo histórico o contrafactual y el realismo mágico.

  9. Catálogo de la obra de Rafael Barco Molina

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    María Concepción Álvarez

    2013-01-01

    Full Text Available Con este artículo se prentende difundir el catálogo de la obra de Rafael Barco Molina (Fuente Victoria, 1903- Almería, 1995, compositor, profesor, director, y sobre todo la cuna musical almeriense de la postguerra, conocido en Almería como el maestro Barco, obras que pertenecen al patrimonio musical de Almería y que hasta el momento han permanecido refugiadas, en su mayor parte, en archivos privados (familia, amigos y discípulos y/o instituciones de ámbito privado (hermandades y SGAE y en muy pocos casos, en instituciones públicas como es el caso de la Biblioteca Nacional de España, en la que se encuentran seis de los títulos que forma la obra musical de este compositor y el archivo de la Banda Municipal de Almería.

  10. Antioxidant and Vasodilator Activity of Ugni molinae Turcz. (Murtilla) and Its Modulatory Mechanism in Hypotensive Response

    Science.gov (United States)

    Jofré, Ignacio; Pezoa, Cesar; Scheuermann, Erick; Rosalen, Pedro Luiz; Romero, Fernando

    2016-01-01

    Hypertension is a systemic condition with high morbidity and mortality rates worldwide, which poses an increased risk for cardiovascular diseases. In this study, we demonstrated the antioxidant and vasodilator activity of Ugni molinae Turcz. (Murtilla) fruit, a berry native to Chile and proposed models to explain its modulatory mechanism in hypotensive response. Murtilla fruits were cultivated in a germplasm bank and submitted to chemical and biological analyses. The phenolic compounds gallic acid, Catechin, Quercetin-3-β-D-glucoside, Myricetin, Quercetin, and Kaempferol were identified. Murtilla extract did not generate toxic effects on human endothelial cells and had significant antioxidant activity against ROS production, lipid peroxidation, and superoxide anion production. Furthermore, it showed dose-dependent vasodilator activity in aortic rings in the presence of endothelium, whose hypotensive mechanism is partially mediated by nitric oxide synthase/guanylate cyclase and large-conductance calcium-dependent potassium channels. Murtilla fruits might potentially have beneficial effects on the management of cardiovascular diseases. PMID:27688827

  11. Diversity in bottle gourd (Lagenaria siceraria - (Molina Standl. Germplasm from peninsular india

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    Sunil N*, Thirupathi Reddy M, Hameedunnisa B, Vinod Someswara Rao P, Sivaraj N, Kamala V, Prasad R B N, Rao B VS K, Chakrabarty S K

    2014-06-01

    Full Text Available A set of 20 diverse accessions of bottle gourd (Lagenaria siceraria (Molina Standl., exhibited wide range of variability for qualitative and quantitative traits. The seed oil content ranged from 18.6 % (IC446598 to 28.0 % (IC446592. The fatty acid composition of bottle gourd seed oil also varied. Days to 50% flowering and peduncle length had significant positive correlation with seed oil content, whereas inter nodal length had significant negative correlation. The intermodal length and number of primary branches per plant had high positive direct effect on fruit yield per plant. Based on the traits, the accessions clustered into three distinct clusters. The diversity may be exploited for crop improvement and the potential of bottle gourd as edible oil source further explored.

  12. A Transitional Gundi (Rodentia: Ctenodactylidae from the Miocene of Israel.

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    Raquel López-Antoñanzas

    Full Text Available We describe a new species of gundi (Rodentia: Ctenodactylidae: Ctenodactylinae, Sayimys negevensis, on the basis of cheek teeth from the Early Miocene of the Rotem Basin, southern Israel. The Rotem ctenodactylid differs from all known ctenodactylid species, including Sayimys intermedius, which was first described from the Middle Miocene of Saudi Arabia. Instead, it most resembles Sayimys baskini from the Early Miocene of Pakistan in characters of the m1-2 (e.g., the mesoflexid shorter than the metaflexid, the obliquely orientated hypolophid, and the presence of a strong posterolabial ledge and the upper molars (e.g., the paraflexus that is longer than the metaflexus. However, morphological (e.g., presence of a well-developed paraflexus on unworn upper molars and dimensional (regarding, in particular, the DP4 and M1 or M2 differences between the Rotem gundi and Sayimys baskini distinguish them and testify to the novelty and endemicity of the former. In its dental morphology, Sayimys negevensis sp. nov. shows a combination of both the ultimate apparition of key-characters and incipient features that would be maintained and strengthened in latter ctenodactylines. Thus, it is a pivotal species that bridges the gap between an array of primitive ctenodactylines and the most derived, Early Miocene and later, gundis.

  13. A Century of Chemical Dynamics Traced through the Nobel Prizes. 1995: Paul Crutzen, Sherwood Rowland, and Mario Molina

    Science.gov (United States)

    van Houten, Josh

    2002-10-01

    The 1995 Nobel Prize was awarded to Paul Crutzen, Sherwood Rowland, and Mario Molina "for their work in atmospheric chemistry, particularly concerning the formation and decomposition of ozone". Collectively, their work established atmospheric chemistry as a major focus at the end of the twentieth century. The results have drawn attention to significant environmental issues in particular, the threat posed to the ozone layer by chlorofluorocarbons.

  14. Chemical profile and antimicrobial activity of Boldo (Peumus boldus Molina) extracts obtained by compressed carbon dioxide extraction

    OpenAIRE

    Mazutti,M.; A J Mossi; CANSIAN,R.L.; M. L. Corazza; Dariva,C.; J. Vladimir Oliveira

    2008-01-01

    This work reports the effects of temperature (20 to 50ºC) and pressure (100 to 250 bar) on the extraction yield, chemical characteristics and antimicrobial activity of extracts of Peumus boldus Molina obtained by compressed carbon dioxide extraction. Results showed that the extraction variables affect the extraction yield and the chemical distribution of the major compounds present in the extracts. The extracts were chemically analyzed with regard to 1,8-cineole, trans-sabinene, pinocarveol, ...

  15. Memorial and biographical history of Spain: El jinete polaco by Antonio Muñoz Molina

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    Felipe Oliver Fuentes Kraffczyk

    2012-12-01

    Full Text Available The novel El jinete polaco by Antonio Muñoz Molina is a highly complex work in which the narrator mixes multiple plotlines in an effort to recreate or remember part of his family past. In the process, the collective memory of the town and people of Mágina (an allegoric space that represents the peasant life of the olive growers of southern Spain appears as a rich and contradictory montage of dreams and failures. And in a third level of discourse, the recent past of Spain also emerges through the main historic al events: the civil war, the protracted military government, and the economic development and current consolidation of democracy. In order to achieve this complex and ambitious narrative project, in El jinete polaco time is not represented as uninterrupted historical timeline but as the rich mixture of the simultaneous experiences of different life courses in terms of both values and cultural patterns in order to understand how the rapid social change affects relations between the various age groups. In other words, time is constructed as a synthesis of the biographical dimension within collective memory and major historical events. This paper seeks to point out the similarities and differences between biographical discourse, collective memory and history.

  16. Morphology of the testes and epididymal ducts in the pampas cat Leopardus colocolo (Molina, 1782

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    Mahmoud Mehanna

    Full Text Available ABSTRACT: The pampas cat Leopardus colocolo (Molina, 1782 is a species of the Felidae family, widely distributed in South America, included on CITES Appendix II and classified as Near Threatened on the IUCN Red List, with population trend decreasing. Based on this information, the objective of this study is to describe morphologically the testes and epididymal ducts of pampas cat. The animal, coming from the Federal University of Mato Grosso Zoo, Brazil, had died after anesthesia procedure and the male reproductive system was dissected to collect the testicles. The samples taken were fragmented and histologically examined. From the microscopic analysis of the testes were identified: vaginal and tunica albuginea, formed by dense connective tissue modeled with large amount of collagen fibers. The tunica albuginea fibrous septa emits into the body. The seminiferous tubules are coiled and coated internally by spermatogenic epithelium consisting of Sertoli cells, surrounded by a basement membrane in the presence of myoid cells. The interstitial tissue between the seminiferous tubules, is composed of loose connective tissue, blood and lymph vessels, and Leydig cells in polyhedral shape. The epididymal ducts showed pseudostratified columnar epithelium with secretory cells of which stereocilia design, situated on a basement membrane filled by myoid cells. This epithelium has principal and basal cells, the main cell design stereocilia toward the lumen of the epididymal duct.

  17. Microencapsulation of maqui (Aristotelia chilensis Molina Stuntz leaf extracts to preserve and control antioxidant properties

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    Leslie Vidal J

    2013-03-01

    Full Text Available Microencapsulation technology is an alternative to stabilize stress factors and protect food ingredients or additives, which include environmentally sensitive bioactive principles in protective matrices to increase their functionality and life span. The objective of this research was to study conditions to obtain microcapsules with antioxidant capacity from a maqui (Aristotelia chilensis [Molina] Stuntz, Elaeocarpaceae leaf extract by emulsification and subsequent retention after microencapsulation. Microcapsules were produced by water-in-oil emulsion (W/O using a phase of the aqueous maqui leaf extract and gum arabic, and a liquid vaseline phase. Maqui leaf extract antioxidant capacity was 99.66% compared with the aqueous phase of the emulsion at 94.38 and 93.06% for 5% and 15% gum arabic, respectively. The mean yield of maqui leaf extract microencapsulation with 5% gum arabic varied between 38 and 48%, whereas with 15% gum arabic it was 39%. Once the antioxidant microcapsules were formed, mean extract antioxidant capacity ranged between 30 and 35%. Both yields responded similarly to changes in gum arabic concentrations (5% and 15% in the aqueous phase of the emulsion; 5% concentration produced a microcapsule size from 1.0 to 10 urn. Maqui leaf extracts with high phenolic compound levels, which can be stabilized and protected by the microencapsulation process, produce new natural preservative systems as compared with their synthetic counterparts.

  18. Insecticidal activity of powder and essential oil of Cryptocarya alba (Molina Looser against Sitophilus zeamais Motschulsky

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    Juan J Pinto

    2016-03-01

    Full Text Available Cereals constitute a relevant part of human and domestic animal diet. Under storage conditions, one of the most significant problems of these crops is insect pests as the maize weevil (Sitophilus zeamais Motschulsky. This insect species is usually controlled by means of synthetic insecticides but problems as toxic residues and resistance has led to the search for more friendly control alternatives such as botanical insecticides. The aim of this research was to evaluate, under laboratory conditions, the insecticidal properties of the powder and the essential oil of peumo (Cryptocarya alba [Molina] Looser; Lauraceae leaves against S. zeamais. The variables assessed were toxicity by contact and fumigant activity, adult emergence (F1, repellent effect, and impact on wheat (Triticum aestivum L. seed germination. A completely randomized design was used with five treatments and 10 replicates. The higher mortality levels were obtained at 80 g powder kg-1 grain and 40 mL essential oil kg-1 grain of C. alba; in both cases, the mortality of adult S. zeamais surpassed 80%. The emergence of adults S. zeamais (F1 was reduced by 100% at 80 g powder kg-1 grain and 40 mL essential oil kg-1 grain. Germination of wheat seeds treated with C. alba powder and essential oil was not affected. Both, the powder and the oil treatments showed repellent effect, but not fumigant activity.

  19. Inheritance of warty fruit texture and fruit color in bottle gourd [Lagenaria siceraria (Molina Standl.

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    Mladenović Emina

    2013-01-01

    Full Text Available Bottle gourd [Lagenaria siceraria (Molina Standl.] is one of the most interesting species in the plant kingdom, due to the diversity of fruit shapes, sizes and ways of use. Warty genotypes are rare compared to non warty genotypes. Considering unusual external appearance of warty fruits, we focused our research on the investigation of its inheritance patterns. By crossing different bottle gourd phenotypes, we studied the mode of inheritance and identified and verified genes responsible for the fruit skin color and warty phenotype segregation. Two parental lines, LAG 70 (with warty fruit of light green color and LAG 71 (smooth fruit, variegated, F1, F2 and backcrosses populations along with both parents were evaluated. Genetic analysis indicated that warty fruit type is a result of monogenic inheritance, whereby the warty fruit type is dominant (Wt trait over to the non-warty fruit type (wt. The mode of inheritance of fruit color was controlled by recessive epistasis, with a ratio of 9 variegated (A-, B-, 3 dark green colored (aaB- and 4 light green colored (aabb fruits in the F2 generation.

  20. Antioxidant and Vasodilator Activity of Ugni molinae Turcz. (Murtilla and Its Modulatory Mechanism in Hypotensive Response

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    Ignacio Jofré

    2016-01-01

    Full Text Available Hypertension is a systemic condition with high morbidity and mortality rates worldwide, which poses an increased risk for cardiovascular diseases. In this study, we demonstrated the antioxidant and vasodilator activity of Ugni molinae Turcz. (Murtilla fruit, a berry native to Chile and proposed models to explain its modulatory mechanism in hypotensive response. Murtilla fruits were cultivated in a germplasm bank and submitted to chemical and biological analyses. The phenolic compounds gallic acid, Catechin, Quercetin-3-β-D-glucoside, Myricetin, Quercetin, and Kaempferol were identified. Murtilla extract did not generate toxic effects on human endothelial cells and had significant antioxidant activity against ROS production, lipid peroxidation, and superoxide anion production. Furthermore, it showed dose-dependent vasodilator activity in aortic rings in the presence of endothelium, whose hypotensive mechanism is partially mediated by nitric oxide synthase/guanylate cyclase and large-conductance calcium-dependent potassium channels. Murtilla fruits might potentially have beneficial effects on the management of cardiovascular diseases.

  1. Karyotypes of two rare rodents, Hapalomys delacouri and Typhlomys cinereus (Mammalia, Rodentia), from Vietnam.

    Science.gov (United States)

    Abramov, Alexei V; Aniskin, Vladimir M; Rozhnov, Viatcheslav V

    2012-01-01

    Karyotypes of Hapalomys delacouri (Rodentia, Muridae) and Typhlomys cinereus (Rodentia, Platacanthomyidae) from Vietnam are described for the first time. The diploid karyotype of Hapalomys delacouri is 38 (NFa=48), consisting of six pairs of bi-armed and 12 pairs of acrocentric autosomes decreasing in size; plus a large metacentric X chromosome and Y chromosome, also metacentric, that is equal in size to the largest pair of acrocentric autosomes. The newly described karyotype differs significantly from that reported for Hapalomys delacouri from northern Thailand. The latter record very likely represents a different species of Hapalomys, possibly the taxon Hapalomys pasquieri described from north-central Laos.The diploid karyotype of Typhlomys cinereus is 38 (NF=48), consisting of five pairs of meta- to submetacentric and 14 pairs of acrocentric chromosomes varying in size from large to small; sex chromosomes were not defined.

  2. Karyotypes of two rare rodents, Hapalomys delacouri and Typhlomys cinereus (Mammalia, Rodentia, from Vietnam

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    Alexei Abramov

    2012-01-01

    Full Text Available Karyotypes of Hapalomys delacouri (Rodentia, Muridae and Typhlomys cinereus (Rodentia, Platacanthomyidae from Vietnam are described for the first time. The diploid karyotype of H. delacouri is 38 (NFa=48, consisting of six pairs of bi-armed and 12 pairs of acrocentric autosomes decreasing in size; plus a large metacentric X chromosome and Y chromosome, also metacentric, that is equal in size to the largest pair of acrocentric autosomes. The newly described karyotype differs significantly from that reported for H. delacouri from northern Thailand. The latter record very likely represents a different species of Hapalomys, possibly the taxon H. pasquieri described from north-central Laos. The diploid karyotype of Typhlomys cinereus is 38 (NF=48, consisting of five pairs of meta- to submetacentric and 14 pairs of acrocentric chromosomes varying in size from large to small; sex chromosomes were not defined.

  3. On subspecific taxonomy of Microtus savii (Rodentia, Arvicolidae

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    Longino Contoli

    2003-10-01

    Full Text Available Riassunto Sulla tassonomia sottospecifica di Microtus savii (Rodentia, Arvicolidae Viene riveduta e riassunta la situazione tassonomica sottospecifica di Microtus (Terricola savii, anche tramite la descrizione di due nuovi taxa: Microtus (Terricola savii tolfetanus, dei Monti della Tolfa e Microtus (Terricola savii niethammericus, del Gargano.

  4. The geological perspective of Italy and Chile by Abbot Juan Ignacio Molina between the 18th and 19th centuries La perspectiva geolgica del Abate Juan Ignacio Molina sobre Italia y Chile entre los siglos XVIII y XIX

    OpenAIRE

    Marco Menichetti

    2011-01-01

    The first geological observations in Chile can be traced to Juan Ignacio Molina, a Jesuit priest who was born in 1740 in Chile and died in 1829 in Bologna, Italy. He received a scholarship education with a strong leaning towards philosophy, the humanities and the sciences at the Jesuit College in Concepcion. In 1767, when all the Jesuits were expelled from Chile and the spanish colonies, he took refuge in Italy, first in Imola and then in Bologna where he taught Greek at the University and la...

  5. El abate Juan Ignacio Molina: una vida dedicada a la historia natural y civil del reino de Chile Abbot Juan Ignacio Molina: A life devoted to the natural and civil history of Chile

    OpenAIRE

    2011-01-01

    Juan Ignacio Molina (1740-1829) naci cerca de Talca, Chile, y falleci en Bolonia, Italia. Es el primer cientfico chileno. Desde pequeo se interes por la naturaleza. Se educ con la Compaa de Jess en diversos lugares de Chile central, lo que le permiti conocer su geografa, fauna, flora y poblacin. Con 15 aos ingres a la Compaa. En 1767, abandon el pas al ser expulsada esta orden de espaa y sus dominios. Se radic en los Estados Pontificios, donde se orden de sacerdote y permaneci hasta su muerte...

  6. Avaliação da qualidade de folhas de boldo-do-chile (Peumus boldus Molina) comercializadas em Curitiba, PR

    OpenAIRE

    M.C.S. Barbosa; Belletti,K.M. da S.; Corrêa,T.F.; C.A. de M. Santos

    2001-01-01

    Foi realizada a avaliação da qualidade de amostras de boldo-do-chile (Peumus boldus Molina) comercializadas na Região Metropolitana de Curitiba. Os resultados mostraram que todas as amostras são autênticas, mas os resultados das análises físico-químicas mostraram-se discrepantes em relação aos parametros da Farmacopéia Brasileira e outras bibliografias de referência.Samples of boldo-do-chile (Peumus boldus Molina) commercialized at the metropolitan area of Curitiba/PR were evaluated to establ...

  7. Alonso Quesada, Agustín Millares Carlo, Argote de Molina y el solar norte de la catedral

    OpenAIRE

    Antonio Henríquez Jiménez

    2001-01-01

    Se presentan dos textos: una carta de don Agustín Millares Carlo y una "Crónica de la ciudad" de Alonso Quesada, que no aparece en su Obra Completa, en los que se habla del solar norte de la catedral de Las Palmas y del enterramiento en él del historiador y genealogista sevilano Gonzalo Argote de Molina.Two Texts are presented: A letter from D. Agustín Millares Carlo and a "Crónica de la ciudad" from Alonso Quesasda, that doesn't appear in the Obra Completa from Alonso Quesada in which is spo...

  8. El abate Juan Ignacio Molina: una vida dedicada a la historia natural y civil del reino de Chile

    OpenAIRE

    Reynaldo Charrier; Francisco Herv

    2011-01-01

    Juan Ignacio Molina (1740-1829) naci cerca de Talca, Chile, y falleci en Bolonia, Italia. Es el primer cientfico chileno. Desde pequeo se interes por la naturaleza. Se educ con la Compaa de Jess en diversos lugares de Chile central, lo que le permiti conocer su geografa, fauna, flora y poblacin. Con 15 aos ingres a la Compaa. En 1767, abandon el pas al ser expulsada esta orden de espaa y sus dominios. Se radic en los Estados Pontificios, donde se orden de sacerdote y permaneci hasta su muerte...

  9. Narrar para contarlo: Labrando la memoria histórica en Beatus ille de Antonio Muñoz Molina

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    Natalia Corbellini

    2004-11-01

    Full Text Available This essay attempts to analyze Muñoz Molina's discourse as a form of "new memory" of the facts and events prevailing in twentieth-century Spain. In his text, the author confronts the ®heroic history¼ of the Civil War and its poets, with the private life-stories of his characters. Beatus ille narrate a heroic discourse on the biography and works of a dark and forgotten writer of the Generación del 27, but the voice, placed emphatically in 1968, omits the moment in which the novel is written and published.

  10. Effect of boldo (Peumus boldus Molina) infusion on lipoperoxidation induced by cisplatin in mice liver.

    Science.gov (United States)

    Fernández, J; Lagos, P; Rivera, P; Zamorano-Ponce, E

    2009-07-01

    Peumus boldus Molina (Monimiaceae), commonly referred to as 'boldo', is used in traditional Chilean medicine to treat hepatic and gastrointestinal diseases. Its leaves are rich in antioxidant compounds, principally alkaloids and flavonoids. This study evaluates the protective effect of a complete boldo leaf infusion on lipoperoxidation (MDA determination at 532 nm) induced by cisplatin in mice liver. To determine if the observed effect can be explained by the action of boldine or catechin, each compound was studied separately. The mice were divided into 8 groups (n = 6): (I) not treated; (II) treated with cisplatin 6 mg/Kg b.w.; (III) treated with boldo leaf infusion 5%; (IV) pretreated with boldo leaf infusion 5% and treated with cisplatin 6 mg/Kg b.w.; (V) treated with boldine 50 mg/Kg b.w.; (VI) pretreated with boldine 50 mg/Kg b.w. and treated with cisplatin 6 mg/kg.b.w.; (VII) treated with catechin; and (VIII) pretreated with catechin 50 mg/Kg b.w. and treated with cisplatin 6 mg/Kg b.w. As expected, the treatment with cisplatin significantly increased (p < 0.01) lipoperoxidation in comparison with the non-treated group. Pretreatment with boldo leaf infusion significantly diminished (p < 0.05) the lipoperoxidation induced by cisplatin with respect to the animals not pretreated with the infusion. The pretreatments with boldine and catechin significantly diminished (p < 0.05) the lipoperoxidation induced by cisplatin with respect to the group treated only with cisplatin. The results suggest that the boldo infusion is acting as a protector with respect to the oxidative hepatic damage caused by cisplatin, and that this protective ability would be due to the presence in the infusion of the natural antioxidants boldine and principally catechin. These findings suggest the potential use of the infusion as a chemoprotector.

  11. New species and records of mites of the superfamily Sarcoptoidea (Acariformes: Psoroptidia) from mammals in Brazil.

    Science.gov (United States)

    Bochkov, Andre V; Valim, Michel P

    2016-01-01

    Sixteen species of the superfamily Sarcoptoidea (Acariformes: Psoroptidia) belonging to 10 genera of the families Atopomelidae, Listrophoridae, Chirodiscidae, and Listropsoralgidae are recorded in Brazil. Among them, three species, Prolistrophorus hylaeamys sp. nov. from Hylaeamys laticeps (Lund, 1840) (Cricetidae: Sigmodontinae) from Minas Gerais, Lynxacarus serrafreirei sp. nov. from Galictis cuja (Molina, 1782) (Carnivora: Mustelidae) from Rio de Janeiro (Listrophoridae), and Didelphoecius micoureus sp. nov. (Atopomelidae) from Micoureus paraguayanus (Tate, 1931) (Didelphimorphia: Didelphidae) from Minas Gerais are described as new for science. Three species of the family Listrophoridae, Prolistrophorus bidentatus Fain et Lukoschus, 1984 from Akodon cursor (Winge, 1887) (Rodentia: Cricetidae) (new host), Prolistrophorus ctenomys Fain, 1970 from Ctenomys torquatus Lichtenstein, 1830 (Rodentia: Ctenomyidae) (new host), and Leporacarus sylvilagi Fain, Whitaker et Lukoschus, 1981 from Sylvilagus brasiliensis (Linnaeus, 1758) (Lagomorpha: Leporidae) (new host) -from Minas Gerais and Rio Grande do Sul, and one species of the family Chirodiscidae, Parakosa tadarida McDaniel and Lawrence, 1962 from Molossus molossus (Pallas, 1766) (Chiroptera: Molossidae) are recorded for the first time in Brazil. The previously unknown female of Didelphoecius validus Fain, Zanatta-Coutinho et Fonseca, 1996 (Atopomelidae) from Metachirus nudicaudatus (Geoffroy, 1803) (Didelphimorphia: Didelphidae) from Minas Gerais is described. All data on host-parasite associations of sarcoptoids in Brazil are summarized. Totally, 61 sarcoptoid species of 8 families are recorded in Brazil.

  12. Feeding habits of Molina's hog-nosed skunk, Conepatus chinga (Carnivora: Mephitidae in the extreme south of Brazil

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    Felipe Bortolotto Peters

    2011-04-01

    Full Text Available Feeding habits of the Molina's hog-nosed skunk, Conepatus chinga (Molina, 1782 in the extreme south of Brazil. We analyzed 60 stomachs of road-kills of C. chinga in the extreme south of Brazil. The contents revealed 808 prey parts, including invertebrates (frequency of occurrence - FO = 96.7% and relative abundance - RA = 94.7%, vertebrates (FO = 18.3% and RA = 2.8% and plants (FO = 31.7% and RA = 2.3%. We identified 18 kinds of food, including the invertebrate order Coleoptera which showed the highest FO (86.7% and RA (75.2%. Other important orders were Orthoptera (FO = 35% and RA = 10.4% and Araneae (FO = 41.7% and RA = 4%. The combination of occurrence and abundance of the preys consumed allowed classifying C. chinga as an omnivorous with a predominance of insects, especially Coleoptera, consuming other invertebrates, vertebrates and plants in smaller numbers. Behavioral and morphological adaptations of C. chinga favor the predation of insects, which are preys that offer low physical resistance and are available in all terrestrial environments.

  13. [Comparative anatomical study of the ventral brain arteries of the Pudu pudu (Molina, 1782) with those of the cow].

    Science.gov (United States)

    Schweitzer-Delaunoy, W

    1997-06-01

    Comparative anatomical study of the ventral brain arteries of the Pudú pudu (Molina, 1782) with those of the cow. A comparison using the corrosion method was made between Pudú pudu (Molina, 1782) ventral brain arteries and those of the cow. The Pudú's Rete mirabile epidurale rostrale (Nomina Anatomica Veterinaria, 1994) is ventrally formed by branches of the A. maxillaris, and caudally formed by the A. vertebralis. The Hypophysis is surrounded by the Rete mirabile rostrale. The lateral parts are rostrally joined to that gland by a thin vascular bridge and caudally by thick arteries. The Pudú's Circulus arteriosus cerebri asymmetrical, that is, on the right side the A. cerebri rostralis ends in the A. cerebri media. The left-side A. cerebri rostralis irrigates every rostral portion of the encephalon. In the cow, practically the same arteries come out of the Circulus arteriosus cerebri, which is not asymmetrical. The A. cerebri caudalis comes first out of the A. communicans caudalis and then the branches for the Pons, and finally the A. cerebelli rostralis. In this species, there are arterial blocks that are not present in Pudú.

  14. Luis de Molina y la esclavitud de los negros africanos en el siglo XVI. Principios doctrinales y conclusiones

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    García Añoveros, Jesús María

    2000-08-01

    Full Text Available One of the most important consequences of Portuguese discoveries was the black slavery business. A most reputed theologist and jurist of the time, Juan de Molina, who had a first-hand knowledge of the subject, made a thorough analysis of the justness of slavery from a Theology and Law perspective, while showing himself opposed to the same. His doctrine set basis for future thought and he must be considered as the first great tratadist on black slavery.

    Una de las consecuencias más importantes de los descubrimientos portugueses en África fue el negocio de los esclavos negros. Luis de Molina, uno de los teólogos y juristas más importantes de su época y con un gran conocimiento del asunto, trató el tema de la licitud de los esclavos negros en amplitud, analizándolo desde la perspectiva de la teología y del derecho, sin omitir su opinión personal contraria a dicha esclavitud. Su doctrina creó escuela y debe ser considerado como el primer gran tratadista de la esclavitud de los negros.

  15. The role of growth stop as a morphogenetic factor in Mastomys natalensis (Rodentia: Muridae)

    DEFF Research Database (Denmark)

    Fadda, Carlo; Leirs, Herwig

    2009-01-01

    The present study investigated growth patterns under three different environmental conditions in a single population of the rodent Mastomys natalensis (Rodentia, Muridae) in Morogoro, Tanzania. The study aimed to test whether and how post-weaning ontogenetic processes are affected by different en...

  16. Identification of lymphocytic choriomeningitis mammarenavirus in house mouse (Mus musculus, Rodentia) in French Guiana.

    Science.gov (United States)

    Lavergne, Anne; de Thoisy, Benoît; Tirera, Sourakhata; Donato, Damien; Bouchier, Christiane; Catzeflis, François; Lacoste, Vincent

    2016-01-01

    Thirty-seven house mice (Mus musculus, Rodentia) caught in different localities in French Guiana were screened to investigate the presence of lymphocytic choriomeningitis mammarenavirus (LCMV). Two animals trapped in an urban area were found positive, hosting a new strain of LCMV, that we tentatively named LCMV "Comou". The complete sequence was determined using a metagenomic approach. Phylogenetic analyses revealed that this strain is related to genetic lineage I composed of strains inducing severe disease in humans. These results emphasize the need for active surveillance in humans as well as in house mouse populations, which is a rather common rodent in French Guianese cities and settlements.

  17. Projecto Rodentia : etologia aplicada na sala de aula do 1º Ciclo

    OpenAIRE

    2008-01-01

    p. 275-279 O Projecto Rodentia, implementado no ano 2006/2007, visa promover a cultura científica em alunos do 1º ciclo do Ensino Básico, familiarizando-os com o Método Científico e desenvolvendo competências conceptuais, processuais e atitudinais, com base na Etologia Aplicada e na reflexão ética sobre o bem-estar animal. Foram instalados em três salas de aula habitats especialmente desenhados, contendo cada um dois ratos de laboratório. Inicialmente orien...

  18. El abate Juan Ignacio Molina: una vida dedicada a la historia natural y civil del reino de Chile Abbot Juan Ignacio Molina: A life devoted to the natural and civil history of Chile

    Directory of Open Access Journals (Sweden)

    Reynaldo Charrier

    2011-09-01

    Full Text Available Juan Ignacio Molina (1740-1829 naci cerca de Talca, Chile, y falleci en Bolonia, Italia. Es el primer cientfico chileno. Desde pequeo se interes por la naturaleza. Se educ con la Compaa de Jess en diversos lugares de Chile central, lo que le permiti conocer su geografa, fauna, flora y poblacin. Con 15 aos ingres a la Compaa. En 1767, abandon el pas al ser expulsada esta orden de espaa y sus dominios. Se radic en los Estados Pontificios, donde se orden de sacerdote y permaneci hasta su muerte. All ense ciencias naturales y produjo su obra cientfica: Compendio de la historia geogrfica, natural y civil del reino de Chile de 1776, una versin aumentada, Ensayo sobre la historia natural de Chile de 1782 y una segunda en 1810. En ellas, abord aspectos climticos, botnicos, geolgicos, zoolgicos, mineralgicos y geogrficos del territorio. Describi el terremoto de Concepcin, las erupciones del Villarrica y Peteroa, e hizo referencia a recursos minerales. Diferenci cuatro unidades litoestratigrficas para Chile central. Clasific plantas y animales siguiendo los criterios de Linneo. En una de sus 14 memorias, Analogas menos observadas de los tres reinos de la Naturaleza, sin podrselo calificar de evolucionista, se destaca su intento de integracin entre los "seres" de los tres reinos, y en Sobre la propagacin del gnero humano en las diversas partes de la tierra, propuso tres vas diferentes para el poblamiento de Amrica. En 1802, ingres a la Academia de Ciencias de Bolonia.Juan Ignacio Molina (1740-1829, born next to Talca, Chile, and dead in Bologna, Italy, is the first Chilean scientist. His education in establishments of the Society of Jesus, in several localities of central Chile, allowed him to learn about its geography, flora, fauna, and population. At 15 years old he entered the Society. In 1767, he left Chile when the Jesuits were expelled from the spanish territories. In Bologna he produced his scientific contribution. Molina published in 1776 the first

  19. Chemical profile and antimicrobial activity of Boldo (Peumus boldus Molina extracts obtained by compressed carbon dioxide extraction

    Directory of Open Access Journals (Sweden)

    M. Mazutti

    2008-06-01

    Full Text Available This work reports the effects of temperature (20 to 50ºC and pressure (100 to 250 bar on the extraction yield, chemical characteristics and antimicrobial activity of extracts of Peumus boldus Molina obtained by compressed carbon dioxide extraction. Results showed that the extraction variables affect the extraction yield and the chemical distribution of the major compounds present in the extracts. The extracts were chemically analyzed with regard to 1,8-cineole, trans-sabinene, pinocarveol, pinocarvone, 4-terpineol, ascaridole, piperitone oxide, limonene dioxide and n-eicosane in a GC/MSD. Antimicrobial tests demonstrated that the high-pressure CO2 extracts had activity against 13 bacteria and that better action was verified with extracts obtained at a lower CO2 extraction density and a higher temperature.

  20. Avaliação da qualidade de folhas de boldo-do-chile (Peumus boldus Molina comercializadas em Curitiba, PR

    Directory of Open Access Journals (Sweden)

    M.C.S. Barbosa

    2001-01-01

    Full Text Available Foi realizada a avaliação da qualidade de amostras de boldo-do-chile (Peumus boldus Molina comercializadas na Região Metropolitana de Curitiba. Os resultados mostraram que todas as amostras são autênticas, mas os resultados das análises físico-químicas mostraram-se discrepantes em relação aos parametros da Farmacopéia Brasileira e outras bibliografias de referência.Samples of boldo-do-chile (Peumus boldus Molina commercialized at the metropolitan area of Curitiba/PR were evaluated to establish their quality control patterns. The results showed that all samples are authentic but the data obtained for the physico-chemical parameters differ from those related at the Brazilian Pharmacopoeia IV ed.

  1. Insecticidal Properties of Peumus boldus Molina Powder Used Alone and Mixed with Lime Against Sitophilus zeamais Motschulsky (Coleopter: Curculionidae Propiedades Insecticidas del Polvo de Peumus boldus Molina Solo y en Mezcla con Cal contra Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae

    Directory of Open Access Journals (Sweden)

    Gabriel Bustos-Figueroa

    2009-09-01

    Full Text Available The insecticidal properties of boldus (Peumus boldus Molina powder used alone and mixed with lime against adults of maize weevil (Sitophilus zeamais Motschulsky were evaluated under laboratory conditions. Additionally, aeration effects (presence or absence and temperature (room temperature vs. 3 ºC on insecticidal properties were studied over time. A mortality rate of 100% was observed at 20 g kg-1 (w/w of P. boldus powder when used alone and mixed with lime in proportions of 50:50, 60:40, and 80:20. The 50% lethal concentration (LC50 for all treatments was Se evaluaron las propiedades insecticidas del polvo de boldo (Peumus boldus Molina, solo y en mezcla con cal, bajo condiciones de laboratorio. Adicionalmente, se evaluó el efecto de la aeración (presencia vs. ausencia y de la temperatura (temperatura ambiente vs. 3 ºC sobre la mortalidad y emergencia de adultos de la F1. La concentración de 20 g kg-1 (p/p del polvo de boldo ya sea solo o en combinación con cal en las proporciones de 50:50, 60:40 y 80:20 mostraron 100% de mortalidad. La concentración letal 50% (CL50, en todos los tratamientos fue menor a 5 g kg-1 (p/p mientras que la CL90 no superó 11 g kg-1 (p/p. La mezcla del polvo con los granos de maíz tanto solo como en mezcla con cal no afectó la germinación. La temperatura y la aeración no afectaron la mortalidad de los adultos parentales ni la emergencia de adultos de la F1. Cuando se mezcló el maíz con el polvo de boldo molido 24 h antes de la infestación con adultos, la mortalidad de los adultos parentales y la emergencia de adultos de la F1 fue de 100 y de 0%, respectivamente. Los resultados no fueron satisfactorios cuando el polvo de boldo almacenado durante 30, 60 y 90 d fue mezclado con el maíz infestado. La toxicidad del follaje de boldo es alta 24 h después de pulverizarse; si el tiempo es mayor, la toxicidad declina significativamente.

  2. The helminth community of Apodemus sylvaticus (Rodentia, Muridae in the Sierra de Gredos (Spain

    Directory of Open Access Journals (Sweden)

    Fuentes, M. V.

    2005-02-01

    Full Text Available The Spanish mountain range of Gredos was included in the studies conducted on the Iberian peninsula to investigate helminth fauna of small mammals. The helminth community of the wood mouse, Apodemus sylvaticus (Rodentia, Muridae, was analysed. Qualitatively, 13 helminth species were detected: Plagiorchis sp. I and Plagiorchis sp. II (Trematoda; Taenia parva larvae, T. martis larvae, T. taeniaeformis larvae, Rodentolepis straminea and R. fraterna (Cestoda; and Trichuris muris, Heligmosomoides polygyrus, Syphacia stroma, S. frederici, Aspiculuris tetraptera and Rictularia proni (Nematoda. Quantitatively, the highest prevalence (65.0% and the mean abundance (36.9% of H. polygyrus stand out. In comparison with the other mountain ranges studied, analysis of the global results demonstrates that the helminth fauna of the host species studied is diverse despite the adverse climatic conditions. This could be related to both the particular ecological characteristics and the appropriate state of preservation of this ecosystem.

  3. Isolation and Characterization of Phenolic Compounds and Anthocyanins from Murta (Ugni molinae Turcz. Fruits. Assessment of Antioxidant and Antibacterial Activity

    Directory of Open Access Journals (Sweden)

    Maria Paula Junqueira-Gonçalves

    2015-03-01

    Full Text Available Berry fruit consumption has become important in the promotion of human health, mainly due to their phenolic compounds, which have been associated with protection against different pathologies, as well as antimicrobial and other biological activities. Consequently, there has been a growing interest in identifying natural antioxidants and antimicrobials from these plants. This study aimed to characterize the phenolic chemical composition and anthocyanin profile of murta (Ugni molinae Turcz. fruit, and to evaluate the antioxidant and antimicrobial activity of its extracts (ethanolic and methanolic. LC/MS of the ethanolic extracts showed the presence of three major compounds: caffeic acid 3-glu, quercetin-3-glu and quercetin, while in the methanolic acid extract they were cyanidin-3-glucoside, pelargonidin-3-arabinose and delphinidin-3-glucoside. The antioxidant activity of ethanolic extracts (DPPH· and ORAC assays was higher than that of methanol acid extracts or purified anthocynins. Furthermore, the methanol acid extract showed an inhibitory activity against the bacteria E. coli and S. typhi similar to that of standard antibiotics. The results suggest that the antioxidant activity of the ethanolic extract is regulated by the high content of phenolic compounds and the fruit’s characteristic color is due to the content of pelargonidin-3-arabinose and delphinidin-3-glucoside. The obtained results demonstrated the appreciable antioxidant and antibacterial activities, providing opportunities to explore murta extracts as biopreservatives.

  4. Antioxidant activity and sensory analysis of murtilla (Ugni molinae Turcz. fruit extracts in an oil model system

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    T. R. Augusto-Obara

    2017-03-01

    Full Text Available An oil model system was used to analyze the antioxidant activity of Chilean fruit extracts and to determine their odor sensory effect. Hydroalcoholic extracts from wild and 14-4 genotype murtilla (Ugni molinae Turcz. fruit were assessed by the Response Surface Methodology. The optimal conditions for producing high total phenolic-content extracts were 49.5% (v/v ethanol at 30 ºC, which yielded 18.39 and 26.14 mg GAE·g-1 dry matter, respectively. The optimized extracts were added to a lipid model system and evaluated via the Schaal Oven Test. After 96 hours, 150 and 200 mg·kg-1 oil of the wild and 14-4 genotype extracts, respectively, showed an antioxidant capacity similar to TBHQ (200 mg·kg-1 oil in terms of peroxide values and odor. Thus, murtilla fruit extracts are a natural source of antioxidants for protecting lipidic foods, such as soybean oil.

  5. Institución Educativa Técnico Industrial Pedro Antonio Molina: eje de desarrollo y bienestar para la comunidad

    Directory of Open Access Journals (Sweden)

    DANIEL ALBERTO ÁLVAREZ WATSON

    2012-01-01

    Full Text Available El caso analiza la situación particular de la Institución educativa Técnico Industrial Pedro Antonio Molina, el liderazgo del rector y el apoyo del sector privado en los procesos de gestión de la calidad. Esto motiva a los integrantes de la institución a trabajar en equipo para lograr la certificación de calidad, mejorando sus resultados académicos año tras año, destacándose a nivel regional y nacional, y generando cambios sociales en su entorno. Metodológicamente, se identificó una institución líder en la ciudad de Cali (Colombia, luego fuentes de información en el contexto local, regional y mundial, consolidándose un caso que muestra las mejores prácticas que una institución educativa realiza para lograr un modelo administrativo susceptible de ser replicado en otras instituciones.

  6. El camino de la biotecnología en la Universidad Nacional Agraria La Molina, Perú

    Directory of Open Access Journals (Sweden)

    Marcel Gutiérrez-Correa

    2013-06-01

    Full Text Available Se realiza un relato histórico sobre los cincuenta años que tiene la carrera de biología en la Universidad Na-cional Agraria La Molina y la gestación, inicio, desarrollo y maduración de la biotecnología en esta universidad. Se describen algunos pormenores de las tres grandes estructuraciones curriculares que finalmente derivan al establecimiento del área de biotecnología en el pregrado y en el doctorado así como a los logros alcanzados. El desarrollo de la biotecnología en la UNALM ha influenciado el desarrollo de esta área en el Perú no solo en las adaptaciones curriculares que se han producido en varias universidades del país sino también en las investigaciones biotecnológicas que se llevan a cabo en universidades e institutos de investigación en las diferentes regiones del país. En este devenir histórico se concluye que el balance es muy positivo y que la mejor corriente epistemológica es la que nos lleva mediante la investigación a encontrar verdades usables en la solución de los problemas del país y, también por qué no, del planeta.

  7. El abate Juan Ignacio Molina: una vida dedicada a la historia natural y civil del reino de Chile

    Directory of Open Access Journals (Sweden)

    Reynaldo Charrier

    2011-09-01

    Full Text Available Juan Ignacio Molina (1740-1829 naci cerca de Talca, Chile, y falleci en Bolonia, Italia. Es el primer cientfico chileno. Desde pequeo se interes por la naturaleza. Se educ con la Compaa de Jess en diversos lugares de Chile central, lo que le permiti conocer su geografa, fauna, flora y poblacin. Con 15 aos ingres a la Compaa. En 1767, abandon el pas al ser expulsada esta orden de espaa y sus dominios. Se radic en los Estados Pontificios, donde se orden de sacerdote y permaneci hasta su muerte. All ense ciencias naturales y produjo su obra cientfica: Compendio de la historia geogrfica, natural y civil del reino de Chile de 1776, una versin aumentada, Ensayo sobre la historia natural de Chile de 1782 y una segunda en 1810. En ellas, abord aspectos climticos, botnicos, geolgicos, zoolgicos, mineralgicos y geogrficos del territorio. Describi el terremoto de Concepcin, las erupciones del Villarrica y Peteroa, e hizo referencia a recursos minerales. Diferenci cuatro unidades litoestratigrficas para Chile central. Clasific plantas y animales siguiendo los criterios de Linneo. En una de sus 14 memorias, Analogas menos observadas de los tres reinos de la Naturaleza, sin podrselo calificar de evolucionista, se destaca su intento de integracin entre los "seres" de los tres reinos, y en Sobre la propagacin del gnero humano en las diversas partes de la tierra, propuso tres vas diferentes para el poblamiento de Amrica. En 1802, ingres a la Academia de Ciencias de Bolonia.

  8. Identification of Fungus Flora Associated with Lagenaria Siceraria (Molina Standl in Côte d’Ivoire

    Directory of Open Access Journals (Sweden)

    Koffi Ahébé Marie-Hélène

    2013-10-01

    Full Text Available Lagenaria siceraria (Molina Standl is a cucurbit which seeds are consumed by people in rural and urban Africa. This plant is subjected to a strong parasitic and diseases pressure that reduces seeds production. Efficient fight against plant parasite, particularly fungus is a prerequisite for an improved productivity. This study was undertaken in five localities (Alepe, Bondoukou, Bongouanou, Divo and Korhogo belonging to three agroecological areas of Côte d’Ivoire. The aim was to identify fungal genera infecting L. siceraria in order to design an efficient control measure. Leaf samples with necrosis and discoloration symptoms were collected throughout the localities and subsequently, fungus were isolated and identified in laboratory. From a total of 750 samples collected, 7 types of symptoms were distinguished. Fungal genera found in all of the localities were Aspergillus, Botryosphaeria, Cochliobolus, Colletotrichum, Fusarium, Lasiodiplodia and Phoma. Only Pestalotiopsis was specific to the locality of Divo. An ANOVA test performed on the data showed a significant difference between fungal genera in terms of isolation frequency. Principal components analysis revealed that fungus distribution in each locality was correlated with climatic factors.

  9. Diversification of Chilean aquaculture: the case of the giant barnacle Austromegabalanus psittacus (Molina, 1782 Diversificación de la acuicultura chilena: el caso del cirripedio gigante Austromegabalanus psittacus (Molina, 1782

    Directory of Open Access Journals (Sweden)

    Daniel A López

    2012-09-01

    Full Text Available Evidence is presented supporting the technical and economic possibilities of giant barnacle Austromegabalanuspsittacus (Molina, 1782 culture, one of the main alternatives for diversifying aquaculture in Chile. Spat collection from the wild varied between different sites in the north and south of the country and according to type of artificial collector. Growth also varied between sites (greater in the north, technological systems (greater in tubular systems and depths (greater at 4 m. Average commercial size in the national market was reached over a period between 18 and 24 months. A long-line can produce between 7 to 10 gross ton during this period, therefore average annual fisheries production can be reached with only 10 to 30 long-lines, in an area of 1 to 3 ha. There is demand for this resource in the external market, particularly in the Japanese market, either as product similar to "fujit subo" (Balanus rostratus, or as a new resource; the relationship between production costs and price determines that giant barnacle culture has commercial potential. Economic indicators for cultured giant barnacle were as follows: net present value (NPV: US$ 490,000; internal rate of return (IRR: 32%; discounted payback period (DPBP: 4 years. Results obtained suggest the natural bank repopulation option, and the development of mass cultures. Giant barnacle culture is based on biological characteristics that differentiate it from other crustaceans species, as well as simple and economic production technologies and favourable economic projections on external markets.Se presentan evidencias de las posibilidades técnicas y económicas del cultivo del cirripedio gigante o "picoroco", Austromegabalanus psittacus (Molina, 1782. Esta especie es una de las principales alternativas para la diversificación de la acuicultura en Chile. La captación de semilla desde el ambiente varió entre distintos sitios del norte y sur del país y según el tipo de colector

  10. What will it take to close the racial and ethnic health disparities gap? A conversation with Michael E. Bird, Reed Tuckson, and Marilyn Aguirre-Molina.

    Science.gov (United States)

    Head, Carmen J; Lathan, Monica J

    2006-07-01

    In the United States, the health of a community is often times determined by poverty and race. As the nation becomes more racially and ethnically diverse, new directives and approaches must be taken to improve health outcomes of minority and underserved communities. Three leading experts in racial and ethnic health share their perspectives regarding where we are and where we need to be in addressing health disparities. Michael E. Bird, MSW, MPH, Reed Tuckson, MPH, and Marilyn Aguirre-Molina, EdD, offer transdisciplinary-focused recommendations that encompass disease prevention, health care, and community mobilization.

  11. Crenosoma brasiliense sp. n. (Nematoda: Metastrongyloidea) parasitic in lesser grison, Galictis cuja (Molina, 1782) (Carnivora, Mustelidae) from Brazil, with a key to species of Crenosoma Molin, 1861.

    Science.gov (United States)

    Vieira, Fabiano M; Muniz-Pereira, Luis C; de Souza, Lima Sueli; Neto, Antonio H A Moraes; Gonçalves, Pamela R; Luque, José L

    2012-09-01

    This study describes Crenosoma brasiliense (Nematoda, Metastrongyloidea), a new species parasitic in bronchi and bronchioles of Galictis cuja (Molina) (Carnivora, Mustelidae) from Brazil. This species differs from other 11 species of Crenosoma by having a cuticular projection at the distal end of the spicules, forming a prominent blade at the tip of the spicule, a vulval cuticular appendage with a triangular shape and prominent vulval lips. There are no previous records of species of Metastrongyloidea in G. cuja or species of Crenosoma in South America. Therefore, the new species represents the first host record and first geographical record of species of Crenosoma in South America.

  12. El arte, la mirada y la intimidad en Ventanas de Manhattan, de Antonio Muñoz Molina

    OpenAIRE

    2010-01-01

    Entre los relatos de Antonio Muñoz Molina, quizá sea Ventanas de Manhattan (2004) aquel que explora con mayor intensidad un motivo recurrente en su obra: la observación del entorno y de las huellas del pasado. En este texto híbrido, que participa de la crónica periodística, el libro de viajes, el ensayo y la novela, dividido en secuencias que a veces constituyen verdaderos microrrelatos, Nueva York se presenta como el espacio del anonimato y la indiferencia, donde “estar viendo y no mirar ...

  13. Larvicidal activity of essential oil of Peumus boldus Molina and its ascaridole-enriched fraction against Culex quinquefasciatus.

    Science.gov (United States)

    de Castro, Débora Silva Borges; da Silva, Denise Brentan; Tibúrcio, Jacqueline Domingues; Sobral, Marcos Eduardo Guerra; Ferraz, Vany; Taranto, Alex Gutterres; Serrão, José Eduardo; de Siqueira, João Máximo; Alves, Stênio Nunes

    2016-12-01

    Culex quinquefasciatus (Say, 1823), known as the domestic mosquito, is a common and abundant species throughout the world, and a cosmopolitan species. The adults of this mosquito are important in terms of public and animal health since they display adaptability to different hosts. In humans, they are responsible for the transmission of various diseases. One manner of control of this vector is the use of insecticidal or larvicidal products, which may have the drawback of toxicity to mammals and can be harmful to the environment. The present work evaluated the larvicidal potential of the essential oil (EO) and ascaridole-enriched fraction (EF4-5) obtained from the leaves of Peumus boldus Molina (boldo). The EO, obtained by steam distillation, was analyzed by GC/MS and fractionated on silica gel. EO and EF4-5, containing 31.4% and 89.5% ascaridole, respectively, were evaluated against C. quinquefasciatus at concentrations of 100, 50 and 25 μg/ml on the third and fourth instars. They showed lethal concentrations (LC50) of 82.14 and 41.85 μg/ml, respectively. Larvae treated with the EF4-5 showed morphological changes in the midgut, with cells possessing a cytoplasm that contained small vacuole-like structures, as well as a nucleus with decondensed chromatin and a cell apex with a short brush border. The cells of the fat body showed larger protein granules, which were acidophilic relative to the larvae of the control group. Moreover, the enriched fraction at a dose of 50 μg/ml showed a residual larvicidal effect according to exposure time on C. quinquefasciatus. This residual effect deserves consideration, since a long-term larvicidal product may be a useful tool for vector control.

  14. Identification and Characterization of Microsatellite Loci in Maqui (Aristotelia chilensis [Molina] Stunz) Using Next-Generation Sequencing (NGS)

    Science.gov (United States)

    Bastías, Adriana; Correa, Francisco; Rojas, Pamela; Almada, Rubén; Muñoz, Carlos; Sagredo, Boris

    2016-01-01

    Maqui (Aristotelia chilensis [Molina] Stunz) is a small dioecious tree native to South America with edible fruit characterized by very high antioxidant capacity and anthocyanin content. To preserve maqui as a genetic resource it is essential to study its genetic diversity. However, the complete genome is unknown and only a few gene sequences are available in databases. Simple sequence repeats (SSR) markers, which are neutral, co-dominant, reproducible and highly variable, are desirable to support genetic studies in maqui populations. By means of identification and characterization of microsatellite loci from a maqui genotype, using 454 sequencing technology, we develop a set of SSR for this species. Obtaining a total of 165,043 shotgun genome sequences, with an average read length of 387 bases, we covered 64 Mb of the maqui genome. Reads were assembled into 4,832 contigs, while 98,546 reads remained as singletons, generating a total of 103,378 consensus genomic sequences. A total of 24,494 SSR maqui markers were identified. Of them, 15,950 SSR maqui markers were classified as perfects. The most common SSR motifs were dinucleotide (31%), followed by tetranucleotide (26%) and trinucleotide motifs (24%). The motif AG/CT (28.4%) was the most abundant, while the motif AC (89 bp) was the largest. Eleven polymorphic SSRs were selected and used to analyze a population of 40 maqui genotypes. Polymorphism information content (PIC) ranged from 0.117 to 0.82, with an average of 0.58. Non-significant groups were observed in the maqui population, showing a panmictic genetic structure. In addition, we also predicted 11150 putative genes and 3 microRNAs (miRNAs) in maqui sequences. This results, including partial sequences of genes, some miRNAs and SSR markers from high throughput next generation sequencing (NGS) of maqui genomic DNA, constitute the first platform to undertake genetic and molecular studies of this important species. PMID:27459734

  15. Identification and Characterization of Microsatellite Loci in Maqui (Aristotelia chilensis [Molina] Stunz Using Next-Generation Sequencing (NGS.

    Directory of Open Access Journals (Sweden)

    Adriana Bastías

    Full Text Available Maqui (Aristotelia chilensis [Molina] Stunz is a small dioecious tree native to South America with edible fruit characterized by very high antioxidant capacity and anthocyanin content. To preserve maqui as a genetic resource it is essential to study its genetic diversity. However, the complete genome is unknown and only a few gene sequences are available in databases. Simple sequence repeats (SSR markers, which are neutral, co-dominant, reproducible and highly variable, are desirable to support genetic studies in maqui populations. By means of identification and characterization of microsatellite loci from a maqui genotype, using 454 sequencing technology, we develop a set of SSR for this species. Obtaining a total of 165,043 shotgun genome sequences, with an average read length of 387 bases, we covered 64 Mb of the maqui genome. Reads were assembled into 4,832 contigs, while 98,546 reads remained as singletons, generating a total of 103,378 consensus genomic sequences. A total of 24,494 SSR maqui markers were identified. Of them, 15,950 SSR maqui markers were classified as perfects. The most common SSR motifs were dinucleotide (31%, followed by tetranucleotide (26% and trinucleotide motifs (24%. The motif AG/CT (28.4% was the most abundant, while the motif AC (89 bp was the largest. Eleven polymorphic SSRs were selected and used to analyze a population of 40 maqui genotypes. Polymorphism information content (PIC ranged from 0.117 to 0.82, with an average of 0.58. Non-significant groups were observed in the maqui population, showing a panmictic genetic structure. In addition, we also predicted 11150 putative genes and 3 microRNAs (miRNAs in maqui sequences. This results, including partial sequences of genes, some miRNAs and SSR markers from high throughput next generation sequencing (NGS of maqui genomic DNA, constitute the first platform to undertake genetic and molecular studies of this important species.

  16. A new species, Litomosoides odilae n. sp (Nematoda: Onchocercidae) from Oligoryzomys nigripes (Rodentia: Muridae) in the rainforest of Misiones, Argentina.

    Science.gov (United States)

    Notarnicola, Juliana; Navone, Graciela

    2002-10-01

    A new species of Litomosoides was collected from the abdominal cavity of Oligoryzomys nigripes (Rodentia: Muridae) in a semideciduous secondary rainforest of Misiones, Argentina. Litomosoides odilae n. sp. belongs to the carinii group and is characterized by the amphids displaced dorsally; buccal capsule with an anterior segment transparent and an annular asymmetrical thickening; esophagus divided, with the posterior glandular portion slightly wider than the muscular; male cloacal aperture strongly protruded; and microfilaria sheathed with an attenuated tail. The morphology of the new species, which is similar to that of L petteri, a parasite of marsupials in Brazil, suggests that host-switching events may have occurred in the diversification of this genus.

  17. A new genus and species of Heligmonellidae (Nematoda: Trichostrongylina) parasitic in Delomys dorsalis (Rodentia: Sigmodontinae) from Misiones, Argentina.

    Science.gov (United States)

    Digiani, María Celina; Kinsella, John M

    2014-10-01

    Alippistrongylus bicaudatus gen. et sp. n. (Nematoda: Heligmonellidae) is described from the striped Atlantic forest rat, Delomys dorsalis (Hensel) (Rodentia: Sigmodontinae), from the province of Misiones in Argentina. The new genus and species is characterised by a synlophe of 21 unequal ridges in both sexes without a gradient in size, with two ridges weakly sclerotised and oriented perpendicularly in the dorsal left quadrant; males with a highly dissymmetrical bursa with a hypertrophied right lobe, and females with a dorsal conical appendage just posterior to the vulva, conferring a two-tailed appearance to the female worms.

  18. Two new species of Litomosoides (Nemata:Onchocercidae) from Ctenomys opimus (Rodentia:Ctenomyidae) on the altiplano of Bolivia.

    Science.gov (United States)

    Brant, S V; Gardner, S L

    1997-08-01

    Two filarioid nematodes, Litomosoides andersoni n. sp. and Litomosoides ctenomyos n. sp. (Nemata: Onchocercidae), are described from the mesenteries of the subterranean rodent Ctenomys opimus (Rodentia: Hystrichognathi) collected on the altiplano of Bolivia. Specimens collected near Rancho Huancaroma (Oruro Dept.) in 1984 and 1986 can be recognized as undescribed by the structures of the spicules and stoma and the shape of the ovijector. This record represents the first time members of the genus Litomosoides have been recovered from rodents of the family Ctenomyidae; this also represents the first published report of these nematodes from mammals in Bolivia.

  19. Terminología botánica indígena en el vocabulario castellanomexicano (1555 de Fray A. De Molina

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    Manuel Galeote

    2002-01-01

    Full Text Available Las voces indígenas de la flora americana, que fray Alonso de Molina incluye en la sección castellana de su obra: Aqui comiença vn vocabulario en la lengua castellana y mexicana (México, Juan Pablos, 1555 se analizan desde el punto de vista histórico y sociolingüístico. Se trata del primer vocabulario de Molina —el Nebrija de las Indias — y, además, el primer diccionario impreso en México y en América. En las entradas castellanas, los términos indígenas americanos de la flora (plantas y frutas constituyen uno de los campos onomasiológicos más numerosos (maíz, cacao, maguey, chía, ají, etc. De los once términos indígenas hemos contabilizado casi un centenar de ocurrencias. En conclusión, este vocabulario muestra el fondo léxico patrimonial del español y los indoamericanismos que se acomodaron a las estructuras de la lengua castellana.

  20. LA VOZ NARRATIVA COMO COMPROMISO CON LA VERDAD ANÁLISIS DEL NARRADOR EN LA NOVELA LA NOCHE DE LOS TIEMPOS, DE MUÑOZ MOLINA

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    Enrique Arroyas

    2012-07-01

    Full Text Available Resumen: Este artículo consiste en un análisis de la voz narrativa de la novela La noche de los tiempos, según un modelo comunicativo que abarca tanto aspectos sintácticos y semánticos como pragmáticos que permitan arrojar luz sobre el sentido del texto. Desde un enfoque pragmático se analiza la finalidad de la narración como acto comunicativo en la que se plantea la relación del discurso con su contexto y del enunciador con el enunciatario. La elección de la voz narrativa y su focalización es uno de los grandes aciertos de esta novela de Muñoz Molina, puesto que en ella reside su verosimilitud y su carácter ético. Abstract: This article examines the narrative voice of La noche de los tiempos, a novel by Antonio Muñoz Molina, according to a communicative model that treats syntactic, semantic, and pragmatics aspects that shed light on the meaning of the text.From a pragmatic perspective I analyze the purpose of the narrative as a communicative act which establishes a relationship of the discourse to its context and of the narrator to the narratee. The choice of narrative voice and its focalization is one of the great achievements of this novel, since it is the source of the work’s verisimilitude and ethical character.

  1. Terminología botánica indígena en el vocabulario castellano-mexicano (1555 de Fray A. de Molina

    Directory of Open Access Journals (Sweden)

    Galeote Manuel

    2002-06-01

    Full Text Available

    Las voces indígenas de la flora americana, que fray Alonso de Molina incluye en la sección castellana de su obra: Aquí comience un vocabulario en la lengua castellana y mexicana (México, Juan Pablos, 1555 se analizan desde el punto de vista histórico y sociolingüístico. Se trata del primer vocabulario de Molina el Nebrija de las Indias y, además, el primer diccionario impreso en México y en América. En las entradas castellanas, los términos indígenas americanos de la flora (plantas y frutas constituyen uno de los campos onomasiológicos más numerosos (maíz, cacao, maguey, chía, ají, etc. De los once términos indígenas hemos contabilizado casi un centenar de ocurrencias. En conclusión, este vocabulario muestra el fondo léxico patrimonial del español y los indoamericanismos que se acomodaron a las estructuras de la lengua castellana.

  2. [Biostratigraphy and paleoecology of the Neogene micromammalian faunas from the Calatayud-Teruel Basin (Spain) / Freudenthal, M. (editor)]: Rodents and lagomorphs from a lower Vallesian fissure filling near Molina de Aragon (Prov. Guadalajara, Spain)

    NARCIS (Netherlands)

    Anduenza, J.I.L.

    1988-01-01

    A new lower Vallesian micromammalian fauna from a locality near Molina de Aragon is described. Five species of Cricetidae, three species of Sciuridae - including a new one (Heteroxerus molinensis) -, two species of Gliridae, and one lagomorph species are described. Also, the paleoecological implicat

  3. Description of the karyotype of Rhagomys rufescens Thomas, 1886 (Rodentia, Sigmodontinae from Southern Brazil Atlantic forest

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    André Filipe Testoni

    2010-01-01

    Full Text Available Rhagomys rufescens (Rodentia: Sigmodontinae is an endemic species of the Atlantic forest from Southern and Southeastern Brazil. Some authors consider Rhagomys as part of the tribe Thomasomyini; but its phylogenetic relationships remain unclear. Chromosomal studies on eight specimens of Rhagomys rufescens revealed a diploid number of 2n = 36 and a number of autosome arms FN = 50. GTG, CBG and Ag-NOR banding and CMA3/DAPI staining were performed on metaphase chromosomes. Eight biarmed and nine acrocentric pairs were found in the karyotype of this species. The X and Y chromosomes were both acrocentric. Most of the autosomes and the sex chromosomes showed positive C-bands in the pericentromeric region. The X chromosome showed an additional heterochromatic block in the proximal region of the long arm. Nucleolus organizer regions (NORs were located in the pericentromeric region of three biarmed autosomes (pairs 4, 6 and 8 and in the telomeric region of the short arm of three acrocentrics (pairs 10, 12 and 17. CMA3/DAPI staining produced fluorescent signals in many autosomes, especially in pairs 4, 6, and 8. This study presents cytogenetic data of Rhagomys rufescens for the first time.

  4. Historical Review and Notes on Small Mammals (Mammalia: Erinaceomorpha, Soricomorpha, Rodentia in Korea

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    Lee, Jeong-Boon

    2014-07-01

    Full Text Available A taxonomic study of small mammals (Erinaceomorpha, Soricomorpha and Rodentia was conducted in order to find out the scientific names which have been used in Korea. The synonymy of each species and taxonomical research was reviewed and confirmed in this study. The species names are rearranged based on recent studies. Among the various confused names, available names were adopted such as follows: C. shantungensis shantungensis known as Crocidura suaveolens; C. shantungensis quelpartis known as C. dsinezumi; Rattus tanezumi known as R. rattus, called black rat, roof rat and ship rat, respectively. Apodemus sylvaticus (Muridae, wood mouse is excluded in the checklist based on indistinct previous records and ambiguous habitation on the Korean Peninsula, and neighbors. In addition, we provide a new Korean vernacular name for Myocastor coypus, called the "Nutria" in Korea. We reflect that several species are repositioned to other genera. A checklist of Korean small mammals and synonym list for each species is provided to avoid confusion of scientific names in Korea. In this study, the list of small mammals in Korea is arranged to 33 species, 20 genera, 8 families, and 3 orders.

  5. Mast cells in the eyes of Calomys callosus(Rodentia: Cricetidae) infected by Toxoplasma gondii.

    Science.gov (United States)

    Gil, Cristiane D; Mineo, José R; Smith, Ricardo L; Oliani, Sonia M

    2002-06-01

    The mast cell is a powerful effector cell for the innate immune system, acting through the secretion of several distinct mediators. Few studies have demonstrated the relationship between mast cells and toxoplasmosis. In this study, mast cells were investigated in two experimental Toxoplasma infections using Calomys callosus (Rodentia: Cricetidae) as the host. Animals were inoculated either intraperitoneally or via the conjunctiva with tachyzoites of Toxoplasma gondii (RH strain) and sacrificed after 5 days or 24 h, respectively. Enucleated eyes were processed for histological and ultrastructural analysis. Neither experimental infection altered the localization of mast cells compared to control eyes, but they did lead to an accumulation in some tissues as well as to their activation. There was a significant increase in the number of mast cells within 5 days and 24 h after infection. The ocular lesions were characterized by the presence of tachyzoites, inflammatory cells and vasodilatation in the iris and retina. In conclusion, mast cells were mobilized in these experimental infections, suggesting that they play an important role in the host inflammatory response after infection with T. gondii.

  6. The complete mitochondrial genome of Microtus fortis calamorum (Arvicolinae, Rodentia) and its phylogenetic analysis.

    Science.gov (United States)

    Jiang, Xianhuan; Gao, Jun; Ni, Liju; Hu, Jianhua; Li, Kai; Sun, Fengping; Xie, Jianyun; Bo, Xiong; Gao, Chen; Xiao, Junhua; Zhou, Yuxun

    2012-05-01

    Microtus fortis is a special resource of rodent in China. It is a promising experimental animal model for the study on the mechanism of Schistosome japonicum resistance. The first complete mitochondrial genome sequence for Microtus fortis calamorum, a subspecies of M. fortis (Arvicolinae, Rodentia), was reported in this study. The mitochondrial genome sequence of M. f. calamorum (Genbank: JF261175) showed a typical vertebrate pattern with 13 protein coding genes, 2 ribosomal RNAs, 22 transfer RNAs and one major noncoding region (CR region).The extended termination associated sequences (ETAS-1 and ETAS-2) and conserved sequence block 1 (CSB-1) were found in the CR region. The putative origin of replication for the light strand (O(L)) of M. f. calamorum was 35bp long and showed high conservation in stem and adjacent sequences, but the difference existed in the loop region among three species of genus Microtus. In order to investigate the phylogenetic position of M. f. calamorum, the phylogenetic trees (Maximum likelihood and Bayesian methods) were constructed based on 12 protein-coding genes (except for ND6 gene) on H strand from 16 rodent species. M. f. calamorum was classified into genus Microtus, Arvcicolinae for the highly phylogenetic relationship with Microtus kikuchii (Taiwan vole). Further phylogenetic analysis results based on the cytochrome b gene ranged from M. f. calamorum to one of the subspecies of M. fortis, which formed a sister group of Microtus middendorfii in the genus Microtus.

  7. Codivergence in heteromyid rodents (Rodentia: heteromyidae) and their sucking lice of the genus Fahrenholzia (Phthiraptera: anoplura).

    Science.gov (United States)

    Light, Jessica E; Hafner, Mark S

    2008-06-01

    Although most studies of codivergence rely primarily on topological comparisons of host and parasite phylogenies, temporal assessments are necessary to determine if divergence events in host and parasite trees occurred contemporaneously. A combination of cophylogenetic analyses and comparisons of branch lengths are used in this study to understand the host-parasite association between heteromyid rodents (Rodentia: Heteromyidae) and their sucking lice of the genus Fahrenholzia (Phthiraptera: Anoplura). Cophylogenetic comparisons based on nucleotide substitutions in the mitochondrial COI gene reveal a significant, but not perfect, pattern of cophylogeny between heteromyids and their sucking lice. Regression analyses show a significant functional relationship between the lengths of analogous branches in the host and parasite trees, indicating that divergence events in hosts and parasites were approximately contemporaneous. Thus, the topological similarity observed between heteromyids and their lice is the result of codivergence. These analyses also show that the COI gene in lice is evolving two to three times faster than the same gene in their hosts (similar to the results of studies of other lice and their vertebrate hosts) and that divergence events in lice occurred shortly after host divergence. We recommend that future studies of codivergence include temporal comparisons and, when possible, use the same molecular marker(s) in hosts and parasites to achieve the greatest insight into the history of the host-parasite relationship.

  8. Paternal behavior and testosterone plasma levels in the Volcano Mouse Neotomodon alstoni (Rodentia: Muridae).

    Science.gov (United States)

    Luis, Juana; Ramírez, Lorena; Carmona, Agustín; Ortiz, Guadalupe; Delgado, Jesús; Cárdenas, René

    2009-01-01

    Paternal behavior and testosterone plasma levels in the Volcano Mouse Neotomodon alstoni (Rodentia: Muridae). Although initially it was thought that testosterone inhibited the display of paternal behavior in males of rodents, it has been shown that in some species high testosterone levels are needed for exhibition of paternal care. In captivity, males of Volcano Mouse (Neotomodon alstoni) provide pups the same care provided by the mother, with the exception of suckling. Here we measured plasmatic testosterone concentrations 10 days after mating, five and 20 days postpartum, and 10 days after males were isolated from their families in order to determine possible changes in this hormone, associated to the presence and age of pups. Males of Volcano Mouse exhibited paternal behavior when their testosterone levels were relatively high. Although levels of this hormone did not change with the presence or pups age, males that invested more time in huddling showed higher testosterone levels. It is possible that in the Volcano Mouse testosterone modulates paternal behavior indirectly, as in the California mouse.

  9. Helminth fauna of the Siberian chipmunk, Tamias sibiricus Laxmann (Rodentia, Sciuridae) introduced in suburban French forests.

    Science.gov (United States)

    Pisanu, Benoît; Jerusalem, Christelle; Huchery, Cindy; Marmet, Julie; Chapuis, Jean-Louis

    2007-05-01

    The spread of an immigrant host species can be influenced both by its specific helminth parasites that come along with it and by newly acquired infections from native fauna. The Siberian chipmunk, Tamias sibiricus Laxmann (Rodentia, Sciuridae), a northeastern Eurasiatic ground nesting Sciurid, has been introduced in France for less than three decades. Thirty individuals were collected from three suburban forests in the Ile-de-France Region between 2002 and 2006. Two intestinal nematode species dominated the helminth fauna: Brevistriata skrjabini [Prevalence, P, 99% C.I., 87% (64-97%); mean intensity, M.I., 99% C.I., 43 (28-78)] and Aonchotheca annulosa [P, 47% (25-69%); M.I., 35 (3-157)]. B. skrjabini is a direct life cycle nematode species of North Eurasiatic origin, with a restricted spectrum of phylogenetically related suitable hosts. This result indicates that B. skrjabini successfully settled and spread with founder pet chipmunks maintained in captivity and released in natura. Chipmunks acquired A. annulosa, a nematode species with a large spectrum of phylogenetically unrelated suitable host species, from local Muroid rodent species with similar behavior, life-history traits and habitats. Quantitative studies are needed to evaluate the potential for both B. skrjabini and A. annulosa to impede the spread of Tamias and for B. skrjabini to favor chipmunk colonization through detrimental effects upon native co-inhabiting host species.

  10. Lamotheoxyuris ackerti n. gen., n. comb. (Nematoda: Heteroxynematidae parasite of Neotoma spp. (Rodentia: Muridae Lamotheoxyuris ackerti n. gen., n. comb. (Nematoda: Heteroxynematidae parásito de Neotoma spp. (Rodentia: Muridae

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    JORGE FALCÓN-ORDAZ

    2010-06-01

    Full Text Available On the basis of the revision of the type material of Aspiculuris ackerti Kruidenier & Mehra, 1959, and new specimens collected from Neotoma nelsoni Goldman, 1905 (Rodentia: Cricetidae, in Veracruz, Mexico, we herein to which A. ackerti is transferred as Lamotheoxyuris ackerti This new genus differs from all other genera included in 1 mouth surrounded by six lips; 2 extension of lateral alae describe a new genus (Lamotheoxyuris n. gen., (Kruidener & Mehra, 1959 n. gen., n. comb. Heteroxynematinae by the following main traits: reduced; and 3 lack of caudal alae.Con base en la revisión del material tipo de Aspiculuris ackerti Kruidenier y Mehra, 1959 y de nuevos ejemplares recolectados en Neotoma nelsoni Goldman, 1905 (Rodentia: Cricetidae, en Veracruz, México, se describe un nuevo género (Lamotheoxyuris n. gen., al que A. ackerti es transferido como Lamotheoxyuris ackerti (Kruidener y Mehra, 1959 n. gen., n. comb. Este nuevo género se distingue de todos los demás géneros incluidos en Heteroxynematinae por las siguientes características: 1 presencia de seis labios rodeando la boca; 2 extensión reducida del ala lateral; y 3 carencia de ala caudal.

  11. AGRO-BOTANICAL CHARACTERISTICS OF LAGENARIA (Lagenaria siceraria (Molina Standl. IN IMAGES AND SYMBOLS Агро-ботанические характеристики лагенарии (Lagenaria siceraria (Molina Standl. в образах и символах

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    Tsatsenko L. V.

    2013-09-01

    Full Text Available The article considers the agro-botanical characteristics of pumpkin annual plants – lagenaria ( Lagenaria siceraria (Molina Standl. have been consider in article. The task of the analytical study went in search of communication between anatomic-morphological characteristics of plant and use this in the images, the iconography of the cultural traditions of different nation

  12. AGRO-BOTANICAL CHARACTERISTICS OF LAGENARIA (Lagenaria siceraria (Molina) Standl.) IN IMAGES AND SYMBOLS Агро-ботанические характеристики лагенарии (Lagenaria siceraria (Molina) Standl.) в образах и символах

    OpenAIRE

    Tsatsenko L. V.

    2013-01-01

    The article considers the agro-botanical characteristics of pumpkin annual plants – lagenaria ( Lagenaria siceraria (Molina) Standl.) have been consider in article. The task of the analytical study went in search of communication between anatomic-morphological characteristics of plant and use this in the images, the iconography of the cultural traditions of different nation

  13. Análise da contaminação fúngica em amostras de Cassia acutifolia Delile (sene) e Peumus boldus (Molina) Lyons (boldo-do-Chile) comercializadas na cidade de Campinas, Brasil Analysis of the fungal contamination in Cassia acutifolia Delile (sene) and Peumus boldus (Molina) Lyons (boldo-do-Chile) sold in Campinas, Brazil

    OpenAIRE

    Liliana O Rocha; Maria Magali S. R. Soares; Cristiana Leslie Corrêa

    2004-01-01

    A sociedade atual tem buscado a fitoterapia como um importante recurso terapêutico, sendo a avaliação da qualidade microbiológica destes produtos um requisito essencial, considerando a sua origem. Deste modo, o objetivo da pesquisa foi realizar a contagem e a identificação de fungos filamentosos em 20 amostras de folhas de Cassia acutifolia Delile (sene) e de Peumus boldus (Molina) Lyons (boldo-do-Chile) comercializadas em farmácias de manipulação e mercados da cidade de Campinas, Brasil, usa...

  14. Control of the biological process through continuous measurement of the sludge age. Experiences in the WWTP Molina de Segura (Murcia, Spain); Control del proceso biologico mediante la medida en continuo de la edad del fango. Experiencias en la EDAr Molina de Segura (Murcia)

    Energy Technology Data Exchange (ETDEWEB)

    Marques, F.; Pradas, P.; Lardin, C.; Simon, P.

    2010-07-01

    This paper reports the results obtained when a sludge age based control is incorporated in the biological process of a wastewater treatment plant (WWTP). Greater stability of the biological process is achieved when this control is implemented in WWTP of Molina de Segura. In particular biodiversity has increased and it has been possible to reduce and stabilize the secondary sludge production. An improvement of the sludge decantation and a reduction of the specific volumetric load of secondary clarifiers have also been observed. finally, costs have been reduced dur to the decrease of cationic polyelectrolyte consumption. (Author) 16 refs.

  15. Un Andalou au Pays basque. Ardor guerrero de Muñoz Molina (1995) : problèmes identitaires pendant la Transition espagnole (1975-1982)

    OpenAIRE

    Elvire Diaz

    2007-01-01

    L’écrivain, journaliste et académicien, Antonio Muñoz Molina (Jaén, 1956) retrace dans Ardor guerrero, roman à caractère autobiographique, son expérience militaire en tant qu’appelé, affecté au Pays Basque, entre octobre 1979 et décembre 1980. Dans un contexte de transition politique et idéologique, qui définit les Statuts d’autonomie des anciennes régions « historiques», le narrateur-personnage d’Ardor guerrero décrit et analyse non seulement la rudesse de la vie militaire dans la caserne de...

  16. Un Andalou au Pays basque. Ardor guerrero de Muñoz Molina (1995 : problèmes identitaires pendant la Transition espagnole (1975-1982

    Directory of Open Access Journals (Sweden)

    Elvire Diaz

    2007-07-01

    Full Text Available L’écrivain, journaliste et académicien, Antonio Muñoz Molina (Jaén, 1956 retrace dans Ardor guerrero, roman à caractère autobiographique, son expérience militaire en tant qu’appelé, affecté au Pays Basque, entre octobre 1979 et décembre 1980. Dans un contexte de transition politique et idéologique, qui définit les Statuts d’autonomie des anciennes régions « historiques», le narrateur-personnage d’Ardor guerrero décrit et analyse non seulement la rudesse de la vie militaire dans la caserne de...

  17. Extended longevity of reproductives appears to be common in Fukomys mole-rats (Rodentia, Bathyergidae.

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    Philip Dammann

    Full Text Available African mole-rats (Bathyergidae, Rodentia contain several social, cooperatively breeding species with low extrinsic mortality and unusually high longevity. All social bathyergids live in multigenerational families where reproduction is skewed towards a few breeding individuals. Most of their offspring remain as reproductively inactive "helpers" in their natal families, often for several years. This "reproductive subdivision" of mole-rat societies might be of interest for ageing research, as in at least one social bathyergid (Ansell's mole-rats Fukomys anselli, breeders have been shown to age significantly slower than non-breeders. These animals thus provide excellent conditions for studying the epigenetics of senescence by comparing divergent longevities within the same genotypes without the inescapable short-comings of inter-species comparisons. It has been claimed that many if not all social mole-rat species may have evolved similar ageing patterns, too. However, this remains unclear on account of the scarcity of reliable datasets on the subject. We therefore analyzed a 20-year breeding record of Giant mole-rats Fukomys mechowii, another social bathyergid species. We found that breeders indeed lived significantly longer than helpers (ca. 1.5-2.2fold depending on the sex, irrespective of social rank or other potentially confounding factors. Considering the phylogenetic positions of F. mechowii and F. anselli and unpublished data on a third Fukomys-species (F. damarensis showing essentially the same pattern, it seems probable that the reversal of the classic trade-off between somatic maintenance and sexual reproduction is characteristic of the whole genus and hence of the vast majority of social mole-rats.

  18. The tubular compartment and the spermatogenic dynamics of the wild rodent Oxymycterus nasutus (Rodentia: Cricetidae).

    Science.gov (United States)

    Morais, Ana Carolina Torre; Balarini, Maytê Koch; Lopes, Elizabeth Oliveira; Menezes, Tatiana Prata; Quintela, Fernando Marques; Morais, Danielle Barbosa; Gomes, Marcos de Lucca M; Matta, Sérgio Luis P da

    2014-10-01

    Despite the order Rodentia present worldwide distribution and large number of species in the Brazilian fauna, detailed studies on testicular morphophysiology are still scarce. Therefore, this study aimed to analyze the dynamics of the spermatogenic process of Oxymycterus nasutus using morphometrical and stereological tools. Testicles from ten sexually mature males were used, showing a gonadosomatic index of 0.89%. The testicular parenchyma showed one of the highest tubulesomatic indexes reported among wild rodents - 0.82% - from which 65.12% was allocated into seminiferous epithelium. The average tubular diameter was 249.89 μm, whereas the epithelium height was 62.47 μm and the total length was 18.62 m per gram of testis. Eight different stages of the seminiferous epithelium cycle were described. Stage 1 was used for counting the germ cell population as well as the Sertoli cells. On average, 3.47 type-A spermatogonia, 24.39 primary spermatocytes in preleptotene/leptotene, 24.13 primary spermatocytes in pachytene, 68.38 round spermatids and 7.33 Sertoli cells were found per tubular cross section. There were 91.02 × 10(6) Sertoli cells per gram of testis and each cell was able to support 9.33 spermatids and 16.43 germ cells. The coefficient of spermatogonial mitosis was 7.02, while 2.83 spermatids were produced for each primary spermatocyte in pachytene. The overall efficiency of spermatogenesis was 19.70 cells, whereas the sperm reserve per gram of testis totalized 849.63 × 10(6) spermatids. Therefore, the presented data showed that O. nasutus shows a high energetic investment in reproduction, corroborating the findings for other species of the Cricetidae family.

  19. Postnatal ontogeny of limb proportions and functional indices in the subterranean rodent Ctenomys talarum (Rodentia: Ctenomyidae).

    Science.gov (United States)

    Echeverría, Alejandra Isabel; Becerra, Federico; Vassallo, Aldo Iván

    2014-08-01

    Burrow construction in the subterranean Ctenomys talarum (Rodentia: Ctenomyidae) primarily occurs by scratch-digging. In this study, we compared the limbs of an ontogenetic series of C. talarum to identify variation in bony elements related to fossorial habits using a morphometrical and biomechanical approach. Diameters and functional lengths of long bones were measured and 10 functional indices were constructed. We found that limb proportions of C. talarum undergo significant changes throughout postnatal ontogeny, and no significant differences between sexes were observed. Five of six forelimb indices and two of four hindlimb indices showed differences between ages. According to discriminant analysis, the indices that contributed most to discrimination among age groups were robustness of the humerus and ulna, relative epicondylar width, crural and brachial indices, and index of fossorial ability (IFA). Particularly, pups could be differentiated from juveniles and adults by more robust humeri and ulnae, wider epicondyles, longer middle limb elements, and a proportionally shorter olecranon. Greater robustness indicated a possible compensation for lower bone stiffness while wider epicondyles may be associated to improved effective forces in those muscles that originate onto them, compensating the lower muscular development. The gradual increase in the IFA suggested a gradual enhancement in the scratch-digging performance due to an improvement in the mechanical advantage of forearm extensors. Middle limb indices were higher in pups than in juveniles-adults, reflecting relatively more gracile limbs in their middle segments, which is in accordance with their incipient fossorial ability. In sum, our results show that in C. talarum some scratch-digging adaptations are already present during early postnatal ontogeny, which suggests that they are prenatally shaped, and other traits develop progressively. The role of early digging behavior as a factor influencing on

  20. Effect of methanolic extract of Lagenaria siceraria (Molina Standley fruits on marble-burying behavior in mice: Implications for obsessive-compulsive disorder

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    R P Prajapati

    2011-01-01

    Full Text Available Context: Obsessive-compulsive disorder (OCD is the fourth most common mental disorder and is diagnosed nearly as often as asthma and diabetes mellitus. Over the last decade, the inhibition of burying of glass marbles by mice has been used as an index of anti-OCD drug action in the so-called marble-burying test. Lagenaria siceraria (Molina Standley (LS, commonly known as "bottle gourd" (English, possesses several medicinal properties; little is known about its action as a nerve tonic. Objective: The purpose of this study was to characterize the anti-OCD (anti-compulsive activity of the methanolic extract of the fruits of L. siceraria (Molina Standley (LS using the marble-burying behavior in mice. Materials and Methods: The experiment was conducted in specific animal models of Swiss albino mice to evaluate marble-burying behavior. Results and Conclusions: Intraperitonial administration of 25 and 50 mg/kg of LS extract significantly (P < 0.001 decreased the total number of buried marbles. The effect was comparable to that of the fluoxetine (10 mg/kg, i.p.. Fluoxetine and LS fruit extract do not produce any overt motor dysfunction. Preliminary phytochemical screening of the methanolic extract of LS showed the presence of flavonoids, saponins, sterols, proteins, tannins and carbohydrates. The results of the study for the first time show that the plant possesses anti-compulsive (anti-OCD activity, confirming the traditional claims. Future research should focus on the identification and the mechanism of action of the constituents from this plant.

  1. TENSIONES ENTRE LITERATURA, CIENCIA, EXPERIENCIA E HISTORIA EN UN INTELECTUAL DE LA SATTELZEIT HISPANOAMERICANA: LOS PREFACIOS EN LA PROSA CIENTÍFICA DE JUAN IGNACIO MOLINA Tensions between literature, science, experience and history in an intellectual of the Sattelzeit in Spanish America: the prefaces in the scientific prose of Juan Ignacio Molina

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    Adolfo de Nordenflycht B

    2009-12-01

    Full Text Available Este estudio se propone una revisión de los prefacios de las principales obras de Juan Ignacio Molina (el Compendio anónimo de 1776, el Saggio de 1782 traducido al español como Compendio en 1788 y el Saggio de 1810 a fin de evidenciar cómo ciertos aspectos literarios de su prosa científica -en particular, los problemas del género (ensayo, compendio la escritura de "historias naturales", el significado del narrar y el sentido de la experiencia del sujeto- ilustran las tensiones inherentes durante el proceso del cambio semántico del concepto de "ciencia" en el marco de la Sattelzeit hispanoamericana.A study which propounds a review of the prefaces of Juan Ignacio Molina's principal works (the anonymous Compendio 1116, the Saggio 1782, translated into Spanish like Compendio in 1788 and the Saggio 1810 in order to demonstrate how certain literary aspects of his scientific prose -in particular, gender issues (essay, compendium, the writing of "Natural History", the meaning of the narrative and the sense of the subject's experience- ¡Ilustrate the tensions inherent in the process of semantic change of the concept of "science" in the frame of the Sattelzeit in Spanish América.

  2. Squamasnema amazonica n. gen. n. sp. (Heligmonellinae): A new parasite of Proechimys roberti (Rodentia: Echimyidae) in the Brazilian Amazon.

    Science.gov (United States)

    Cordeiro, Helrik da Costa; Melo, Francisco Tiago de Vasconcelos; Furtado, Adriano Penha; Giese, Elane Guerreiro; Maldonado, Arnaldo; dos Santos, Jeannie Nascimento

    2015-08-01

    A new species of nematode, Squamasnema amazonica n. gen. n. sp., is described based on specimens found parasitizing the small intestine of Proechimys roberti (Rodentia: Echimyidae) collected during a survey of the fauna of Tapirapé-Aquirí National Forest (Brazil, Eastern Brazilian Amazon). The nematodes were fixed and processed for light microscopy and scanning electron microscopy (SEM). These nematodes were classified under the family Heligmonellidae and the subfamily Heligmonellinae. Although several species in the family Heligmonellidae exhibit discontinuous ridges, Squamasnema n. gen. and Trichotravassosia are the only genera with columns of scales along their entire body, as an apomorphy of the synlophe. Squamasnema n. gen. has columns of cuticular cells along its body, except for on the left flank, and exhibits a synlophe with no size gradient or inclination and does not present chitinized structures supporting the synlophe. Therefore, due to these morphological differences of Squamasnema n. gen., the creation of a new genus was necessary.

  3. Redescription of Trichuris pampeana (Nematoda: Trichuridae) from the South American subterranean rodent Ctenomys talarum Thomas, 1898 (Rodentia: Octodontidae).

    Science.gov (United States)

    Rossin, M Alejandra; Malizia, Ana I

    2005-02-01

    Trichuris pampeana Suriano and Navone, 1994 (Nematoda: Trichuridae) is redescribed from voucher specimens from the type host Ctenomys azarae Thomas, 1903 (Rodentia: Octodontidae) and from parasites collected from 2 populations of the subterranean rodent C. talarum Thomas, 1898 from Mar de Cobo and Necochea, Buenos Aires Province, Argentina. After a revision of these nematodes, it was confirmed that the following characters were not considered in the original description: bacillary band, cells from the esophagointestinal junction, ejaculatory duct, vas deferens, adanal papillae, vagina, oviduct, and rectum. Additional information about the spicular sheath, vulva, uteri, and ovary is provided. The morphological features given in this redescription allow to confirm the identity of T. pampeana as a valid species and also to distinguish it more clearly from other species of the genus.

  4. A classification of the Gliridae (Rodentia on the basis of dental morphology

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    Remmert Daams

    1995-05-01

    Full Text Available Abstract The supra-familiar relationships of the Gliridae are discussed. The criterion used for subdividing the Gliridae is the morphology of the cheek teeth because this is the only character known for all taxa. This limitation leads to the undesirable "synonymy" of Glamys and Gliravus, two genera whose type species have a very different skull morphology, and to the incorporation into the Dryomyinae of Graphiurus and Leithia, despite the fact that Dryomys has a myomorph, Graphiurus a hystricomorph and Leithia a sciuromorph skull. The hundred and seventy-seven species and thirty eight genera of dormice are grouped into five subfamilies. One of these, the Bransatoglirinae, is new. The subfamily Graphiurinae is supressed and Graphiurus is assigned to the Dryomyinae. The genera of the Gliridae and the species allocated to them are listed in the appendix in alphabetical order. The original diagnoses of the genera are given in English and the type locality, type level and synonymy of each species is given. Riassunto Una classificazione di Gliridae (Rodentia sulla base della morfologia dentale - Vengono discusse le relazioni soprafamiliari dei Gliridi. I1 criterio utilizzato per la suddivisione dei Gliridi è la morfologia dei denti molari poiché è l'unico carattere noto per tutti i taxa. Questa limitazione porta alla "sinonimia" non voluta di Glamys e Gliravus, due generi le cui specie tipiche presentano una struttura del cranio molto diversa, ed alla incorporazione di Graphiurus e Leithia nei Dryomyinae, sebbene Dryomys abbia un cranio miomorfo, Graphiurus un cranio istricomorfo e Leithia un cranio sciuromorfo. Le centosettantasette specie ed i trentotto generi di Gliridi sono raggruppati in cinque sottofamiglie. Una di queste, Bransatoglirinae, è nuova. La

  5. Arquitectura fluvial de las «Areniscas del río Arandilla». Triásico de Molina de Aragón (Guadalajara

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    Sánchez-Moya, Y.

    1989-08-01

    Full Text Available The outstanding outcrops of Upper Buntsandstein sediments (Middle Triassic in Molina de Aragón (Guadalajara area, allow a detailed study of their characteristics and their associations which are described here. The fluvial architecture of the section indicates four main depositional episodes. The two lowest episodes were laid down by a fluvial system characterized by frequent channel shifting, low sinuosity and wide shallow channels. The drainage basin was controlled by highly seasonal discharge. The middle episode evolved into a more distal systems, with smaller higher sinuosity channels and fine overbank deposits. The uppermost episode is related to an increase of slope in the basin. That increase is probably related to tectonic movements recorded in this area. An attempt has been made to correlate the above events to the global sea level fluctuations (Haq et al., 1987. So, the low stage that have been stated occurred during Early Anisian can be tentatively correlated with the uppermost episode in Areniscas del río Arandilla.Los excelentes afloramientos de la parte superior del Buntsandstein (Triásico medio en Molina de Aragón (Guadalajara, han permitido llevar a cabo un análisis sedimentológico detallado de las facies fluviales y de su arquitectura. Se han distinguido doce diferentes facies cuyas características y asociaciones se describen en este trabajo. La evolución fluvial indica la existencia de cuatro episodios deposicionales. Los dos episodios inferiores son característicos de un sistema fluvial con canales de baja sinuosidad, inestables, de gran amplitud y poca profundidad. El drenaje de la cuenca estaba controlado por importantes descargas estacionales. El episodio intermedio es el resultado de la evolución del sistema hacia facies más distales. En esta etapa los canales son de menor tamaño, la sinuosidad es mayor y existe un mayor porcentaje de depósitos de granulometría fina relacionados con la llanura de inundaci

  6. Juan Ignacio Molina y la comprensión de la naturaleza del Finis Terrae. Un acercamiento desde la Historia (cultural de la Ciencia

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    Orrego González, Francisco

    2011-10-01

    Full Text Available The study of the work of the Chilean Jesuit Juan Ignacio Molina (1740-1829, especially since the Chilean historiography, has accused an important criticism myopia about of the naturalist that constantly has been considered, with fairly light weight, as the “first Chilean scientist”. The fundamental importance of exile as a scientific vocation, the European controversies about the New World and the institutional conditions and political mechanisms that allowed the development of scientific knowledge in late eighteenth century are elements that have not been integrated into the analysis of the work of the naturalist Chilean who came to integrate the Bologna Academy of Sciences. Therefore, the proposed historical analysis of this article seeks to break the apologetic historiography in order to present the work and figure of the Chilean Jesuit in a broad historical context, in an attempt to provide alternative answers, shows part of the political and epistemological problems that influenced the development of scientific thought of the Chilean naturalist.El estudio de la obra del jesuita chileno Juan Ignacio Molina (1740-1829, especialmente desde la historiografía chilena, ha acusado una importante miopía crítica respecto del naturalista que constantemente ha sido considerado, con bastante ligereza, como el “primer científico chileno”. La importancia fundamental del exilio como vocación científica, las controversias europeas sobre el Nuevo Mundo y las condiciones institucionales y mecanismos políticos que permitieron el desarrollo del conocimiento científico a fines del siglo XVIII son elementos que no han sido integrados en el análisis de la obra del naturalista chileno quien llegó a integrar la Accademia delle Scienze di Bologna. Por tanto, la propuesta de análisis histórico de este artículo busca romper con la historiografía apologética para presentar la obra y la figura del jesuita chileno en un contexto histórico amplio y

  7. Optimization of the anaerobic digestion through application of ultrasounds in secondary sludge of the wastewater treatment plant of Molina de Segura (Murcia, Spain); Optimizacion de la digestion anaerobia mediante la aplicacion del ultrasonidos en los fangos secundarios de la EDAR Molina de Segura (Murcia)

    Energy Technology Data Exchange (ETDEWEB)

    Simon Andreu, P. J.; Lardin, C.; Andreu, J. a.; Bolinches Sanchez, S.; Garcia, A.; Pinana, L.; Pradas, P.; Gutierrez Garcia, D.

    2007-07-01

    The application of ultrasounds in secondary sludge in the wastewater treatment plant of Molina de Segura produces an instantaneous hydrolysis on the existing cellular walls in secondary sludge, all it in a time of retention of 2 seconds as opposed to the 8 days of minimum time of required retention in any anaerobic digestion. This hydrolysis instantaneously increases the biodegradable matter easily biodegradable accelerating the processes of digestion and allowing to the passage to next the three stages (acidogenesis, acetogenesis and methanogenesis), providing great amount of benefits, as are, an increase of the yield of elimination of volatile material, an increase in the production of biogas and a reduction in the production of dehydrated sludge. (Author)

  8. Presence of a Phytoplasma Associated with Witches’-Broom Disease in Ugni molinae Turcz. and Gaultheria phillyreifolia (Pers. Sleumer Determined by DAPI, PCR, and DNA Sequencing Presencia de un Fitoplasma Asociado a la Enfermedad de "Escoba de Bruja" en Ugni molinae Turcz. y Gaultheria phillyreifolia (Pers. Sleumer Determinado Mediante DAPI, PCR y Secuenciación de ADN

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    Nolberto Arismendi S

    2010-03-01

    Full Text Available Murta (Ugni molinae Turcz. and common chaura (Gaultheria phillyreifolia (Pers. Sleumer are native species of Chile. Plants of both species have shown over-branching like witches' broom. The causal agents of these symptoms in many plants are phytoplasma. To verify the presence of these microorganisms, DAPI (4',6-diamidino-2-phenylindole staining analysis and polymerase chain reaction (PCR were performed in symptomatic and asymptomatic plants. Positive PCR samples were sequenced to identify the pathogens involved. In individuals of both species with witches’ broom symptoms, DAPI staining showed fluorescent bodies in the phloem tissues, but not in asymptomatic plants. Verification by nested-PCR, phytoplasmatic DNA was amplified from diseased murta and chaura, but not in apparently healthy plants. Sequencing of amplified products allowed locating phytoplasma within the ash yellows group (16SrVII and related to Candidatus phytoplasma fraxini. This is the first report of phytoplasma in Chilean native species. Considering the diversity of plant species infected by the ash yellows group suggests that G. phillyreifolia and U. molinae could be a phytoplasma reservoir for other economically important agricultural crops.La murta (Ugni molinae Turcz. y la chaura común (Gaultheria phillyreifolia (Pers. Sleumer son especies nativas de Chile. En plantas de ambas especies se ha observado una sobre-ramificación de tipo "escoba de bruja". En muchas plantas los agentes causales de esta sintomatología son fitoplasmas. Para verificar la presencia de estos microorganismos se analizaron plantas con y sin síntomas mediante tinciones DAPI (4’,6-diamidino-2-fenilindol y reacción en cadena de la polimerasa (PCR. Muestras positivas en la PCR fueron secuenciadas para identificar al fitopatógeno implicado. En individuos de ambas especies con síntomas de escoba de bruja, la tinción DAPI permitió observar cuerpos fluorescentes en los tejidos del floema, situaci

  9. TITLE: Tirso de Molina and The Trickster of Seville: The Traditionalist Hypothesis and the State of the Question. TÍTULO: Tirso de Molina y El burlador de Sevilla: la hipótesis tradicionalista y el estado de la cuestión

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    Alfredo Rodríguez López-Vázquez

    2011-04-01

    Full Text Available ABSTRACT: This paper analizes the critical and methodological basis of the two recent Studies about the problems on textual priority and authorship between Tan largo me lo fiáis and El burlador de Sevilla: the edition according to William F. Hunter’s text and the book by Laura Dolfi on the relationship between Tirso de Molina and Don Juan. Our study remarks important omissions in both works, both in the bibliographical field and the ecdotical basis regarding the two texts. We claim that both authors, supporters of the traditional hypothesis on authorship and priority, support their points of view in the form of critical opinions formulated in an insufficient way from the critic point of view and in an incomplete and biased way regarding ecdotical possibilities of both texts. RESUMEN: Este artículo analiza las bases críticas y metodológicas de dos recientes estudios sobre los problemas de la prioridad textual y de la autoría entre Tan largo me lo fiáis y El burlador de Sevilla: the edition according to William F. Hunter’s text and the book by Laura Dolfi sobre la relación entre Tirso de Molina y Don Juan. Nuestro estudio constata importantes omisiones en ambas obras, tanto en el campo bibliográfico como en la fundamentación ecdótica de ambos textos. Sostenemos que ambos autores, partidarios de la hipótesis tradicional sobre la autoría y la prioridad, exponen sus puntos de vista en forma de opiniones críticas formuladas de manera insuficiente desde el punto de vista crítico y de forma incompleta y parcial respecto a las posibilidades ecdóticas de ambos textos.

  10. Bioactivity of Peumus boldus Molina, Laurelia sempervirens (Ruiz & Pav. Tul. and Laureliopsis philippiana (Looser Schodde (Monimiacea essential oils against Sitophilus zeamais Motschulsky

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    Carmen Herrera-Rodríguez

    2015-09-01

    Full Text Available The maize weevil (Sitophilus zeamais Motschulsky is one of most important pest of stored seeds worldwide, but its current control method is based on the use of synthetic insecticides, usually leading to undesirable problems such as insecticide residues on treated food, human intoxications, and insect resistance development. Therefore the search of friendly alternative methods is required. The aim of this study was to assess, under laboratory conditions, the insecticidal properties of Peumus boldus Molina, Laurelia sempervirens (Ruiz & Pav. Tul., and Laureliopsis philippiana (Looser Schodde essential oils against S. zeamais. The phytochemical analysis of the three essential oils showed 1,8-cineole, safrole and methyleugenol as the common components; all of them documented with insecticidal activity from essential oils from other plant species. The highest toxicity (100% mortality of these three oils acting as a contact insecticide was observed at 24 h exposure at 4% concentration. The estimated LC50 values for P. boldus, L. sempervirens, and L. philippiana were 0.37, 1.02, and 0.28 μL g-1, respectively. Peumus boldus exhibited the highest fumigant activity with 100% adult mortality at 30 μL oil L-1 air. At ≥ 0.5% (v/w concentration, all essential oils showed repellent activity. These three essential oils showed a promissory insecticidal activity against the maize weevil.

  11. Effect of vacuum storage on shelf life of a grain protector based on Peumus boldus Molina foliage powder and lime against Sitophilus zeamais Motschulsk

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    Paulina Rivera

    2014-03-01

    Full Text Available The maize weevil (Sitophilus zeamais Motschulsky, Coleoptera: Curculionidae is a key pest of stored grain maize. As an ecological pest control alternative, the use of botanical insecticides, such as powder from boldus (Peumus boldus Molina foliage singly or mixed with lime, has been evaluated. Unfortunately, its shelf life is very short and does not exceed 15 d. The effectiveness of vacuum storage on insecticidal properties of a natural grain protector produced with boldus powder:lime at proportions of 50:50 and 60:40 against adults of S. zeamais was assessed under laboratory conditions. Treatments were evaluated at 1% and 2% (w/w for 150 d of storage. All treatments based on boldus powder kept the level of mortality by contact activity over 80% at 150 d of storage. The highest toxicity, as a fumigant, was observed in treatments 50:50 at 2% and 60:40 at 1% and 2% with mortality over 60%. The grain weight loss was less than 1% and seed germination was not affected. With the exception of 0:100 at 2% without vacuum storage, all treatments were repellent to S. zeamais. Vacuum storage extended shelf life of the grain protector for 150 d.

  12. Bioactivity of a water extract of boldus (Peumus boldus Molina against Spodoptera frugiperda (J.E. Smith and Helicoverpa zea Boddie (Lepidoptera: Noctuidae

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    Gonzalo Silva

    2013-06-01

    Full Text Available The insecticidal properties of water-extract of Peumus boldus Molina and its effect on the development cycle and feeding habits of Spodoptera frugiperda J.E. Smith and Helicoverpa zea Boddie were evaluated under laboratory conditions in concentrations of 0.25, 0.5, 1.0, 2.0, 4.0, and 8.0% (w/w. Spodoptera frugiperda was the most susceptible with 75% mortality at 7 d at 8% P. boldus concentration, while H. zea had only 30% mortality. LC50 was 2.31 mL kg-1 for S. frugiperda and 16.05 mL kg¹ for H. zea. When the extract concentration increased in the diet, larval size and weight, percentage of pupation and number of adults decreased, and the time required to reach those states was greater. Neonate larvae fed primarily on the diet with the lower extract concentration and the control was preferred by more than 50% of larvae. Inhibition of feeding, growth, weight gain of 3rd instar larvae as well as new biomass production decreased with concentration of the extract.

  13. Landscape dynamics and fire activity since 6740 cal yr BP in the Cantabrian region (La Molina peat bog, Puente Viesgo, Spain)

    Science.gov (United States)

    Pérez-Obiol, R.; García-Codron, J. C.; Pèlachs, A.; Pérez-Haase, A.; Soriano, J. M.

    2016-03-01

    A lack of paleobotanic studies with adequate resolution and multiproxy approaches has limited proper discussion of vegetation dynamics in Cantabria and of the role of fires in the configuration of the plant landscape during the Holocene in the northwest part of the Iberian peninsula. The pollen diagram of La Molina peat bog in Puente Viesgo (43°15‧38″ N-3°58‧37″ W; ETRS89), located at 484 m.a.s.l., and the study of its sedimentary charcoals allowed the acquisition of a continuous and thorough fire sequence for the last 6700 cal yr BP and an understanding of its relationship to the forest. The results show the importance of human influence on the incidence and characteristics of fire activity during the different phases studied: the Neolithic, Bronze Age, Iron Age, Roman period, and Middle Ages. A synergy seems to exist between dry climate periods (especially during Bond events 3 and 4) and a greater presence of biomass. As the Holocene advances, vegetation coverage clearly tends to decrease. This study provides key elements for understanding the role of fire activity in the forest dynamics of deciduous and evergreen Quercus, Corylus, Pinus, Fagus, and Alnus and demonstrates the strongly artificialized character of the present landscape.

  14. Estudo experimental de Zygodontomys lasiurus (Rodentia-cricetidae com cepas de Trypanosoma cruzi Studies on the experimental infection of Zygodontomys lasiurus (Rodentia-Cricetidae with three strains of Trypanosoma cruzi

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    Monamaris M. Borges

    1983-10-01

    Full Text Available São apresentados resultados em relação a infecção expertmental de Zygodontomys lasiurus (Rodentia-Cricetidae com duas cepas de T. cruzi isoladas de casos humanos, Y e Berenice, e uma isolada de um triatomíneo silvestre, chamada costalimai. Foram realizados estudos em relação a evolução da parasitemia, duração da patência e prepatência da infecção. Com o objetivo de verificar a agressividade e tropismo tissular das cepas de T. cruzi nesta espécie de roedor, foram também realizados estudos histopatológicos. Os resultados obtidos mostraram que os níveis de parasitemias foram baixos para as três cepas estudadas. A patência da infecção variou de 14 a 16 dias nos animais inoculados com a cepa Y, 26 a 29 dias com a Berenice e 9 a 13 dias com a costalimai. O período prepatente variou de 3 a 5 dias nos animais inoculados com a cepa Y, de 2 a 6 dias com a cepa Berenice e de 6 a 8 dias com a costalimai. As três cepas apresentaram em Z. lasiurus, comprometimento nitidamente muscular, provocando reações leves, moderadas e intensas.Studies on the experimental infection of Zygodontomys lasiurus (Rodentia-Cricetidae are presented in the current paper. Three strains of T. cruzi were used in the experiments: two, Y and Berenice, were originated from human infection, while the third one was obtained from natural infection in a wild bug Triatoma costalimai. The evolution of the parasitemia was studied and the prepatent and patent periods determined. The tissular tropism and aggressiveness of the strains of T. cruzi were verified through histopathological studies. Results have shown that the parasitemia was always kept at low levels for all the strains. The prepatent period in the infected rodents varied from: 3 to 6 days in the Y strain; 2 to 6 days in the Berenice strain; 6 to 8 in the costalimai strain. The patent period showed the following duration patterns: 14 to 16 days in the Y strain; 26 to 29 in the Berenice strain and 6 to 8

  15. A phylogeographic study of the endemic rodent Eliurus carletoni (Rodentia: Nesomyinae) in an ecological transition zone of Northern Madagascar.

    Science.gov (United States)

    Rakotoarisoa, Jean-Eric; Raheriarisena, Martin; Goodman, Steven M

    2013-01-01

    We conducted a mitochondrial phylogeographic study of the endemic dry forest rodent Eliurus carletoni (Rodentia: Nesomyinae) in an ecological transition zone of northern Madagascar (Loky-Manambato) and 2 surrounding regions (Ankarana and Analamerana). The main goal was to assess the evolutionary consequences on this taxon of the complex landscape features and Quaternary ecological vicissitudes. Three haplogroups were identified from the 215 specimens obtained from 15 populations. High levels of genetic diversity and significant genetic differentiation among populations were observed. The different geographical subdivisions of the study area by regions, by river catchment zones, and the physical distance between populations are not correlated with genetic patterns. In contrast, population structure is mostly explained by the geographic distribution of the samples among existing forest blocks. E. carletoni experienced a genetic bottleneck between 18 750 and 7500 years BP, which correlates with periods when moister climates existed on the island. Overall, our data suggest that the complex genetic patterns of E. carletoni can be explained by Quaternary climatic vicissitudes that resulted in habitat fluctuations between dry and humid forests, as well as subsequent human-induced fragmentation of forest habitat.

  16. Trypanosoma (Megatrypanum) lainsoni n. sp. from Mesomys hispidus (Rodentia: Echimyidae) in Brazil: trypomastigotes described from experimentally infected laboratory mice.

    Science.gov (United States)

    Naiff, Roberto Daibes; Barrett, Toby Vincent

    2013-01-01

    We report the detection, isolation and description of Trypanosoma (Megatrypanum) lainsoni n. sp. from a caviomorph rodent, Mesomys hispidus (Rodentia: Echimyidae), obtained in the Rio Negro region of the state of Amazonas, in northern Brazil. Laboratory-bred white mice (Mus musculus) and rats (Rattus rattus) were inoculated with large numbers of culture forms by intraperitoneal route, and trypomastigotes appeared in their blood 3-8 days post-inoculation. One single epimastigote was also found in Mus musculus. Similar attempts to infect Rattus norvegicus, hamsters (Mesocricetus auratus), the opossum Didelphis marsupialis, the anteater Tamandua tetradactyla and triatomine bugs were unsuccessful, following six months of observations and microscopic examinations of blood films and blood cultures. As we have found no previous record of a Trypanosoma (Megatrypanum) species naturally infecting a member of the family Echimyidae, or any other caviomorph rodent, we conclude that this is the first time such an infection has been reported. The new species is unusual in the subgenus for its infectivity to laboratory mice.

  17. AVES DEL CAMPUS DE LA UNIVERSIDAD NACIONAL AGRARIA LA MOLINA (LIMA-PERÚ) - UNA REVISIÓN DE SU ABUNDANCIA, DISTRIBUCIÓN Y DIVERSIDAD DESDE 1992 AL 2010

    OpenAIRE

    Castillo Palacios, Lucía; Universidad Nacional Agraria La Molina (Perú).; Castañeda Córdova, Liz; Universidad Nacional Agraria La Molina (Perú).; Quinteros Carlos, Zulema; Universidad Nacional Agraria La Molina (Perú).

    2014-01-01

    El campus de la Universidad Nacional Agraria La Molina (UNALM) Lima – Perú, se presenta como un ecosistema variado y complejo con áreas agrícolas, urbanas y naturales. El presente trabajo es una compilación de tres estudios publicados en los años 1992, 2007 y 2010; y observaciones mensuales realizadas en el año 2010, con el fin de tener un panorama general sobre el cambio de la abundancia, distribución y diversidad de la comunidad de aves presente en la UNALM (1989-2010). Para el año 2010 se ...

  18. FLUCTUACIÓN POBLACIONAL INVIERNO – PRIMAVERA DE Pinnaspis aspidistrae (Signoret), Fiorinia fioriniae (Targioni Tozzetti), Chrysomphalus aonidum (Linnaeus) (HEMIPTERA: DIASPIDIDAE) Y SUS PARASITOIDES, EN PALTO. LA MOLINA, LIMA – PERÚ

    OpenAIRE

    2016-01-01

    Se realizaron observaciones sobre la fluctuación poblacional de Pinnaspis aspidistrae (Signoret), Fiorinia fioriniae (Targioni Tozzetti), Chrysomphalus aonidum (Linnaeus) y sus parasitoides en el cultivo de palto en el área agrícola de la Universidad Nacional Agraria La Molina. El campo se dividió en 5 sectores y se tomaron 5 árboles al azar por cada sector, donde se evaluaron semanalmente 200 hojas (haz y envés) en estratos (tercio medio e inferior) desde el 16 de julio hasta el 17 de diciem...

  19. Caracterización de los suelos de usos agrícolas e industrial de la comarca de Molina de Segura (Murcia) para una planificación racional del territorio

    OpenAIRE

    Gómez García, Ana María

    2016-01-01

    El presente estudio pretende conocer la situación actual de los suelos de la comarca de Molina de Segura (Murcia) así como ver si presentan una planificación racional del territorio ya que no había estudios anteriores que caracterizaran tan detalladamente los tipos y usos de los suelos de esta comarca. Los dos principales tipos de suelos presentes son Regosoles calcáricos (suelos poco evolucionados con un horizonte A ócrico en superficie como único horizonte diagnóstico y con abundante car...

  20. COMPARAÇÃO DA QUALIDADE SANITÁRIA ENTRE AMOSTRAS DE Peumus boldus Molina INDUSTRIALIZADAS E ARTESANAIS DO MUNICÍPIO DE CURRAIS NOVOS, RN.

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    Fabio Gonçalves Macêdo de Medeiros

    2012-06-01

    Full Text Available As plantas medicinais, embora constituam válida vertente da Medicina Tradicional, quando mal utilizadas representam risco potencial a saúde humana. O consumo de produtos contaminados pode gerar intoxicações diversas por subprodutos advindos de microrganismos patogênicos. O presente trabalho objetivou a avaliação da qualidade microbiológica de amostras de Peumus boldus Molina artesanais, comercializadas na feira popular, e compará-la com a qualidade microbiológica de amostras da mesma espécie industrializadas, comercializadas no comércio varejista local. Foram quantificados: aeróbios mesófilos (ágar Padrão de Contagem, 35±1°C/24h, coliformes totais/Escherichia coli (teste presuntivo: caldo LST, 35±0,5°C/24-48±2; CT: caldo VB, 35±0,5°C/24-48±2; E. coli: caldo EC, 44,5±0,2°C/24±2h; ágar L-EMB, 35±0,5°C/24±2h, bolores e leveduras (ágar Batata Dextrosado Acidificado, 25±1°C/5 dias e Staphylococcus aureus (ágar Baird-Parker, 35-37°C/24±2h. Para a confirmação de E. coli, colônias foram submetidas às provas bioquímicas da série IMViC. A E. coli estava presente em 10% das amostras, o S. aureus em 50%, bolores e leveduras em 80% e aeróbios mesófilos em 100% das amostras analisadas. O estudo revelou que a tanto amostras industrializadas quanto artesanais não estavam de acordo com as recomendações de padrões sanitários e microbiológicos adequados para o comércio, caracterizando-se como riscos potenciais à Saúde Pública.

  1. Catalog of type specimens of recent mammals: Rodentia (Sciuromorpha and Castorimorpha) in the National Museum of Natural History, Smithsonian Institution

    Science.gov (United States)

    Fisher, Robert D.; Ludwig, Craig A.

    2012-01-01

    The type collection of Recent mammals in the Division of Mammals, National Museum of Natural History, Smithsonian Institution, contains 843 specimens bearing names of 820 species group taxa of Rodentia (Sciuromorpha and Castorimorpha) as of July 2011. This catalog presents a list of these holdings, which comprise 798 holotypes, 14 lectotypes, seven syntypes (30 specimens), and one neotype. In addition, we include three holotypes and 10 specimens that are part of syntype series that should be in the collection but cannot be found and three syntypes that were originally in this collection but are now known to be in other collections. One specimen that no longer has name-bearing status is included for the record. Forty-one of the names are new since the last type catalog. One new lectotype is designated. Suborders and families are listed as in Wilson and Reeder. Within families, currently recognized genera are arranged alphabetically. Within each currently recognized genus, accounts are arranged alphabetically by original published name. Information in each account includes original name and abbreviated citation thereto, current name if other than original, citation for first use of current name combination for the taxon (or new name combination if used herein for the first time), type designation, U.S. National Museum catalog number(s), preparation, age and sex, type locality, date of collection and name of collector, collector’s original number, and comments or additional information as appropriate. Digital photographs of each specimen serve as a condition report and will be linked to each electronic specimen record.

  2. Análise da contaminação fúngica em amostras de Cassia acutifolia Delile (sene e Peumus boldus (Molina Lyons (boldo-do-Chile comercializadas na cidade de Campinas, Brasil Analysis of the fungal contamination in Cassia acutifolia Delile (sene and Peumus boldus (Molina Lyons (boldo-do-Chile sold in Campinas, Brazil

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    Liliana de O. Rocha

    2004-12-01

    Full Text Available A sociedade atual tem buscado a fitoterapia como um importante recurso terapêutico, sendo a avaliação da qualidade microbiológica destes produtos um requisito essencial, considerando a sua origem. Deste modo, o objetivo da pesquisa foi realizar a contagem e a identificação de fungos filamentosos em 20 amostras de folhas de Cassia acutifolia Delile (sene e de Peumus boldus (Molina Lyons (boldo-do-Chile comercializadas em farmácias de manipulação e mercados da cidade de Campinas, Brasil, usando as técnicas microbiológicas clássicas. Os resultados obtidos evidenciaram que 45% das amostras analisadas se situavam fora dos padrões estabelecidos pela Organização Mundial da Saúde (OMS. Não foram observadas diferenças significativas na análise quantitativa da contaminação fúngica entre amostras comercializadas em farmácias de manipulação e mercados, tanto para o boldo-do-Chile como para a sene. Os fungos identificados nestas amostras foram: Aspergillus, Penicillium, Phoma, Cladosporium, Trichoderma, Rhizopus, Mucor, Aureobasidium pullulans, Mycelia sterilia, Acremonium e Monilia sitophila. Estes resultados demonstraram o baixo nível de qualidade desses fitoterápicos, pois, além do elevado número de amostras contaminadas, foram identificados fungos de gêneros produtores de micotoxinas, como o Aspergillus e o Penicillium. Verifica-se a urgência na realização de adequado controle de qualidade microbiológico dos fitoterápicos e de implantação de fiscalização efetiva, para garantir a segurança e eficácia destes produtos.The consumption of medicinal plants has increased during the last years. The purpose of this study was to evaluate and identify fungi specimens present in samples of Cassia acutifolia Delile (20 (sene and Peumus boldus (Molina Lyons (Boldo-do-Chile (20, that were purchased in drugstores and markets of Campinas, Brazil, by usual methods. The results showed that 45% of samples did not fit the minimum

  3. Polyphenol content and antioxidant activity of maqui (Aristotelia chilensis Molina Stuntz during fruit development and maturation in Central Chile Contenidos de polifenoles y actividad antioxidante de maqui (Aristotelia chilensis Molina Stuntz durante el desarrollo y maduración de frutos en Chile Central

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    Carolina Fredes

    2012-12-01

    Full Text Available Maqui (Aristotelia chilensis Molina Stuntz, Elaeocarpaceae is a Chilean native species which produces small berries that are mainly collected from the wild. The health benefits of maqui fruit are attributed to their high polyphenol content as well as their wide variety of anthocyanins and flavonols. One of the main factors that affect the polyphenol content in fruit is the maturity stage at harvest. The objective of this study was to determine total phenol and total anthocyanin content and antioxidant activity (by ferric reducing ability of plasma FRAP assay of maqui fruits harvested at different fruit maturity stages from two wild populations located in Central Chile. Each maturity stage was determined by days from fruit set, berry size, and soluble solids. Total phenol content declined while total anthocyanin content increased from the green to light red stage. Nevertheless, both total phenol and anthocyanin content increased from the light red to dark purple stage. The highest anthocyanin content and antioxidant activity was found in the late maturity stage (dark purple. The results show that ripening in maqui fruit can be expected with 1100 growing degree-days (91 d after fruit set in Central Chile. At this moment of harvest, fruits with 18-19 °Brix have the highest anthocyanin content and antioxidant activity (FRAP. This study constitutes the first advances in the understanding of maqui fruit ripening and corresponding antioxidant activity.El maqui (Aristotelia chilensis Molina Stuntz, Elaeocarpaceae es una especie nativa de Chile que produce unas bayas pequeñas que se recolectan principalmente de individuos silvestres. Los beneficios para la salud atribuidos a los frutos de maqui se deben a sus altos contenidos de polifenoles, así como a la gran variedad de antocianos y flavonoles. Uno de los principales factores que afectan el contenido de polifenoles en frutos es el estado de madurez a la cosecha. El objetivo de este estudio fue

  4. The chromosome complement of Acomys spp. (Rodentia, Muridae) from Oursi, Burkina Faso--the ancestral karyotype of the cahirinus-dimidiatus group?

    Science.gov (United States)

    Volobouev, V; Gautun, J C; Sicard, B; Tranier, M

    1996-11-01

    We present here data on chromosome banding analysis (R- and C-bands) of Acomys sp. (Rodentia, Muridae) from Oursi, Burkina Faso, characterized by 2n = FN = 68 and comparison of its banding patterns with those of Acomys dimidiatus from Saudi Arabia (2n = 38, FN = 70), studied previously. The study revealed complete homology between acrocentric chromosomes of Acomys sp. and chromosome arms of 16 pairs of metacentric and two pairs of acrocentric chromosomes of A. dimidiatus. In addition to monobrachial homology, one tandem translocation accompanied by a centromeric shift was identified in the karyotype of the latter species. The data obtained show that karyotypes of all the species of the Acomys cahirinus-dimidiatus group studied previously may be derived from that of Acomys sp. from Oursl by means of numerous non-homologous Rb translocations and 1-2 tandem transiocations, and thus its karyotype may be considered as ancestral for the cahirinus-dimidiatus group.

  5. The role of the subterranean rodent Ctenomys talarum (Rodentia: Octodontidae) in the life cycle of Taenia taeniaeformis (Cestoda: Taeniidae) in urban environments.

    Science.gov (United States)

    Rossin, Alejandra; Malizia, Ana I; Denegri, Guillermo M

    2004-06-10

    This work is the first report of subterranean rodent Ctenomys talarum (Rodentia: Octodontidae) as intermediate host of Taenia taeniaeformis in urban areas of Mar de Cobo (Buenos Aires Province, Argentina) and to experimentally reproduce in domestic dogs the adult stage of this parasite. Prevalence, mean abundance and mean intensity of infection with T. taeniaeformis larvae in the liver and peritoneal cavity of C. talarum were 64%, 15.3 and 9.8, respectively. Ten adults of T. taeniaeformis were obtained from experimentally infected dogs. Information about the role of subterranean rodents in the life cycle of this parasite is also given. The above mentioned data indicate that T. taeniaeformis is a frequent parasite of this species of rodents, at least within the study area. Also explanations for the high prevalence of larval forms of this parasite in C. talarum populations are given.

  6. Third lineage of rodent eimerians: morphology, phylogeny and re-description of Eimeria myoxi (Apicomplexa: Eimeriidae) from Eliomys quercinus (Rodentia: Gliridae).

    Science.gov (United States)

    Kvičerová, Jana; Mikeš, Václav; Hypša, Václav

    2011-09-01

    Coccidian oocysts from feces of 46 individuals of the garden dormouse, Eliomys quercinus (Rodentia: Gliridae), were morphologically and molecularly characterized. Both morphological and sequence data (18S rDNA and ORF 470) showed low variability, indicating that all samples represent a single species. By comparison with published morphological descriptions of coccidia from glirid rodents, we determined that the samples represent Eimeria myoxi. Molecular data suggest that this species does not fall within the 2 known rodent-specific groups but branches as a third independent lineage. However, its exact position in respect to other eimerian clusters could not be established due to the lack of phylogenetic information at this taxonomic level for the 18S rRNA and ORF 470 genes. Based on these results, we provide a re-description of Eimeria myoxi, which contains morphological and molecular characteristics sufficient for its further unequivocal identification.

  7. Identidade, riqueza e abundãncia de pequenos mamíferos (Rodentia e Didelphimorphia de área de Floresta com Araucária no estado do Paraná, Brasil

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    Guilherme Grazzini

    2015-01-01

    Full Text Available Roedores e Marsupiais são componentes importantes da fauna na região Neotropical. Estudos sobre a riqueza e abundância destes animais são raros na Floresta Ombrófila Mista (FOM e aqui apresentamos um inventário conduzido na Floresta Nacional de Piraí do Sul. Esta área possui uma área aproximada de 150 ha, cercada por pastos e plantações de Pinus. A amostragem foi feita através de armadilhas de queda, Sherman e Tomahawk, dispostas nos principais tipos de vegetação encontrados. Pelo menos um casal de cada espécie foi coletado. Como resultado, durante 5.892 armadilhas.noite nós obtivemos um total de 1.049 capturas, representando 17 espécies: Akodon montensis, Bibimys labiosus, Brucepattersonius iheringi, Cryptonanus sp., Didelphis albiventris, D. aurita, Gracilinanus microtarsus, Monodelphis americana, M. scalops, Myocastor coypus, Nectomys squamipes, Oligoryzomys nigripes, Oxymycterus judex, O. nasutus, Sooretamys angouya e Thaptomys nigrita. Capturas por armadilhas de queda representaram 67% do total, e oito espécies foram registradas exclusivamente por este método. Akodon montensis, O. nigripes e T. nigrita foram as espécies mais abundantes.

  8. Importance and practices of Egusi crops (Citrullus lanatus (Thunb. Matsum. & Nakai, Cucumeropsis mannii Naudin and Lagenaria siceraria (Molina Standl. cv. 'Aklamkpa' in sociolinguistic areas in Benin

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    Coulibaly O.

    2008-01-01

    Full Text Available Importance et culture de Egusi (Citrullus lanatus (Thunb. Matsum. & Nakai, Cucumeropsis mannii Naudin et Lagenaria siceraria (Molina Standl. cv ' Aklamkpa ' dans les régions sociolinguistiques du Bénin. Les légumes traditionnels africains sont considérés comme potentiellement utiles pour contribuer à la sécurité alimentaire et à la génération de revenu au niveau des communautés locales. Cependant, Egusi (Citrullus lanatus subsp. mucosospermus, Cucumeropsis mannii et Lagenaria siceraria cv. ' Aklamkpa ' a rarement fait l'objet de recherche et de promotion alors que sa culture persiste dans les systèmes de production de plusieurs pays de l'Afrique de l'Ouest. Cette étude met l'accent sur le rôle social des cultures de Egusi et leur importance dans le système de production des groupes sociolinguistiques au Bénin. En 2005, une investigation des systèmes de production et de culture de cinq régions socioculturelles prédominantes indique que la culture de Egusi est classée parmi les dix premières spéculations, selon la perception des ménages interrogés. Le rang attribué aux cultures de Egusi est relatif au genre mais pas à l'âge. Les agriculteurs allouent en moyenne 0,74 ha pour la production de Egusi, avec une différence significative d'une région sociolinguistique à une autre. Dans la communauté Mahi-Fon du centre Bénin, par exemple, nous avons observé des champs de production de Egusi allant jusqu'à 5 ha. L'espèce la plus cultivée est C. lanatus subsp. mucosospermus. Cependant, dans la communauté Adja du sud Bénin, la préférence des agriculteurs est pour L. siceraria cv. ' Aklamkpa '. Egusi se cultive au champ et en jardin de case, soit en association ou en monoculture. C. mannii est généralement cultivée en association et joue un rôle social très important dans les communautés Nagot-Yoruba. Bien que Egusi ne soit pas une culture réservée aux femmes, ces dernières réalisent la plupart des activit

  9. El túnel viario de María de Molina en Madrid. Optimización en el diseño y descripción de las soluciones estructurales adoptadas

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    Granda San Segundo, Laura

    2002-08-01

    Full Text Available Maria de Molina tunnel which will join paseo de la Castellana and Velázquez street with the N-II highway (Madrid - Barcelona will be the largest municipal underground work in Spain. The tunnel is 1171 meters long and it will absorbe a traffic of 30000 vehicles going out every day. The initial part of the tunnel has been designed as false tunnels made with foundation walls and slabs. The concrete has been cast over the ground and the tunnel has been excavated afterwards in order to minimize the effect of the work on Madrid traffic. Once a sufficient depth has been reached, two different construction systems have been proposed, depending on the conditions the tunnel finds in each case. The project presents some singular points in which the solutions adopted are structurally extraordinary.El túnel viario de María de Molina, que unirá el Paseo de la Castellana y la calle Velázquez con la N-II de Madrid a Barcelona, constituirá la mayor obra municipal de pasos subterráneos. El túnel de un total de 1.171 m de longitud va a absorber una salida de tráfico de 30.000 vehículos diarios. En los tramos iniciales se han proyectado falsos túneles con pantallas y losas hormigonadas sobre el terreno y excavadas a posteriori, para minimizar los efectos tráfico. Cuando se alcanza una profundidad adecuada se ha planteado la ejecución de un túnel con dos sistemas constructivos diferentes, dependiendo de los condicionantes que se encuentran en cada momento. El proyecto presenta una serie de puntos singulares en los que las soluciones adoptadas son estructuralmente extraordinarias

  10. Caractérisation botanique et agronomique de trois espèces de cucurbites consommées en sauce en Afrique de l'Ouest : Citrullus sp., Cucumeropsis mannii Naudin et Lagenaria siceraria (Molina Standl

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    Zoro Bi I.A.

    2003-01-01

    Full Text Available Botanical and agronomical characterisation of three species of cucurbit consumed as sauce in West Africa: Citrullus sp., Cucumeropsis mannii Naudin and Lagenaria siceraria (Molina Standl. There are in Côte d'Ivoire at least five species of cucurbit incorrectly called ""pistaches"" in town and cultivated at small scale by women for their oleaginous seeds that are a great importance in the sociocultural live of several peoples. Nevertheless, few studies aimed at the improvement of these plants (related notably to taxonomy, genetic resources collecting missions, genetic characterisation, agronomic evaluation, and selection have been carried out. In order to set up a list of reliable traits that should be examined easily during and after collecting missions, we carry out in the present study, for three species (Citrullus sp., Cucumeropsis mannii Naudin and Lagenaria siceraria (Molina Standl a botanic description and an analysis of eleven agronomic traits: 100-seeds weight, germination rate, seedlings emergence time, matured fruit weight, matured fruit decomposition time, mean number of seeds per fruit, seeds shape, fruit diameter, fruit interior cavity diameter, flowering time, and fruiting time. Statistical analyses using nine of these traits showed that the three species can be completely distinguished with six traits whereas the three other traits allowed partial distinction. Low yields have been observed for the three species: 11.41 kg/ha of decorticated seeds for C. mannii, 18.51 kg/ha for Citrullus sp. and 75.14 kg/ha for L. siceraria. From the observed yield components, the possibilities to improve the production of these cucurbits are discussed.

  11. Differences in richness and composition of gastrointestinal parasites of small rodents (Cricetidae, Rodentia) in a continental and insular area of the Atlantic Forest in Santa Catarina state, Brazil.

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    Kuhnen, V V; Graipel, M E; Pinto, C J C

    2012-08-01

    The first and only study on gastrointestinal parasites of wild rodents in the Island of Santa Catarina was done in 1987. The aim of this study was to identify intestinal parasites from wild rodents in Santo Amaro da Imperatriz and Santa Catariana Island, and to compare the richness and composition of the gastrointestinal parasite community of both areas. Rodents were captured with live traps, and feces were screened using the sedimentation method and optical microscopy. The following species of rodents were captured in the two areas: Akodon montensis, Euryoryzomys russatus, Oligoryzomys nigripes and Nectomys squamipes. In Santo Amaro da Impetratriz, prevalent parasites were: A. montensis (51%), E. russatus (62%), O. nigripes (53%) and N. squamipes (20%). From the Island of Santa Catarina the rodent prevalence rates were: A. montensis (43%), E. russatus (59%), O. nigripes (30%) and N. squamipes (33%) and the collected parasites were: Hymenolepis sp., Longistriata sp., Strongyloides sp., Hassalstrongylus sp., Syphacia sp., Trichomonas sp., Ancylostomidae, Trichuridae, Oxyuridae and Eucoccidiorida. The species richness (10.6 ± 0.7) of the endoparasite comunity in the area located on the continent was higher (p < 0.01) and different (p = 0.001) from that of the area located on the island (6.9 ± 0.5).

  12. Suprafamilial relationships among Rodentia and the phylogenetic effect of removing fast-evolving nucleotides in mitochondrial, exon and intron fragments

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    Arnal Véronique

    2008-11-01

    Castorimorpha (Castoridae + Geomyoidea. The second suprafamilial clustering identified a novel association between the Sciuromorpha (Gliridae + (Sciuridae + Aplodontidae and the Hystricomorpha (Ctenodactylidae + Hystricognathi which together represents the earliest dichotomy among Rodentia. Molecular time estimates using a relaxed Bayesian molecular clock dates the appearance of the five suborders nearly contemporaniously at the KT boundary and this is congruent with suggestions of an early explosion of rodent diversity. Based on these newly proposed phylogenetic relationships, the evolution of the zygomasseteric pattern that has been used for a long time in rodent systematics is evaluated.

  13. Avaliação da qualidade de amostras comerciais de boldo (Peumus boldus Molina, pata-de-vaca (Bauhinia spp. e ginco (Ginkgo biloba L. Control quality evaluation of commercial samples of boldo (Peumus boldus Molina, pata-de-vaca (Bauhinia spp. and ginkgo (Ginkgo biloba L.

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    J. G. de Melo

    2004-01-01

    Full Text Available O presente trabalho procurou avaliar a qualidade de produtos comercializados à base de boldo, pata-de-vaca e ginco, através dos parâmetros contidos na Farmacopéia Brasileira e na literatura específica. Foram analisadas oito amostras de boldo, nove de pata-de-vaca e sete de ginco, adquiridas em farmácias na cidade do Recife. A metodologia consistiu em avaliar: os rótulos e bulas dos produtos verificando se estavam de acordo com a RDC n o 17 de 24/02/2000 e a portaria 110/97 da ANVISA; realizar análise sensorial; verificar a autenticidade das amostras e sua pureza. Todas as embalagens de boldo, pata-de-vaca e seis de ginco continham erros ou ausência de informações científicas, além da falta de bula. Na verificação de impurezas, todas as de boldo, cinco de pata-de-vaca, e uma amostra de ginco foram reprovadas. Todos os produtos analisados apresentaram alguma irregularidade segundo os códigos oficiais, sendo necessário uma maior intensificação na vigilância de produtos à base de plantas medicinais no Brasil.This study aimed to evaluate the quality of commercial products prepared with boldo (Peumus boldus Molina, pata-de-vaca (Bauhinia spp. and ginkgo (Ginkgo biloba L. by using parameters from the Brazilian Pharmacopoeia and specific literature. Eight samples of "boldo", nine of "pata-de-vaca", and seven of ginkgo were analyzed, all bought from pharmacies in Recife (Pernambuco, Brazil. The methodology consisted in evaluating the products’ labels and instructions to verify their accordance to RDC n o 17 of 02/24/2000 and ANVISA (National Sanitary Surveillance Agency decree 110/97, undertaking a sensorial analysis, and verifying the authenticity and purity of the samples. All of the packages of "boldo" and "pata-de-vaca" and six of the packages of ginkgo contained mistakes or lacked scientific information; instructions were also missing. After analyzing for impurities, all samples of "boldo", five of "pata-de-vaca", and one of

  14. Una nueva especie del género Hoplopleura Enderlein, 1904 (Anoplura, Hoplopleuridae parásita de Andinomys edax (Rodentia, Cricetidae

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    González, A.

    1996-12-01

    Full Text Available The authors described a new species Hoplopleura zentaensi sp. n. based on specimens collected on Andinomys edax Thomas, l902, from Sierra de Zenta, Jujuy province, Argentina. Descriptions involve the holotype female; three nymphal instar, external architecture of eggs and sites of oviposition, providing differences with its close relative Hoplopleura hirsuta Ferris, l916 and Hoplopleura oxymycteri Ferris, l921. Comments on distribution of these species on their hosts are presented and they are included in the “erratica” group.Describimos en esta contribución a Hoplopleura zentaensi sp. n., a partir de la hembra, sus tres estadios ninfales y las características coriónicas externas del huevo de la referida especie parásita de Andinomys edax Thomas, 1902 (Rodentia, Cricetidae, capturado en Sierra de Zenta, Jujuy, Argentina. Hoplopleura zentaensi sp. n. es afín a Hoplopleura hirsuta Ferris, 1916 y de Hoplopleura oxymycteri Ferris, 1921, integrando junto a estas especies el grupo “erratica”.

  15. Catalog of type specimens of recent mammals: orders Didelphimorpha through Chiroptera (Excluding Rodentia) in the National Museum of Natural History, Smithsonian Institution

    Science.gov (United States)

    Fisher, Robert D.; Ludwig, Craig A.

    2015-01-01

    The type collection of Recent Mammals in the Division of Mammals, National Museum of Natural History, Smithsonian Institution, contains 820 specimens bearing names of 809 species-group taxa of Didelphimorphia through Chiroptera, excluding Rodentia, as of June 2014. This catalog presents an annotated list of these holdings comprised of 788 holotypes, 26 lectotypes, 11 syntypes (22 specimens), and 4 neotypes. Included are several specimens that should be in the collection but cannot be found or are now known to be in other collections. One hundred and twenty-seven of the names are new since the last type catalog covering these orders, Poole and Schantz (1942). Five specimens reported in Poole and Schantz (1942) were subsequently sent to the Vertebrate Paleontology collection and are not included here. Orders and families are ordered as in Wilson and Reeder (2005); within families, currently recognized genera are arranged alphabetically; within each currently recognized genus, accounts are arranged alphabetically by original published name. Information in each account includes original name and abbreviated citation thereto, current name if other than original, citation for first use of current name combination for the taxon (or new name combination if used herein for the first time), type designation, U.S. National Museum catalog number(s), preparation, age and sex, date of collection and collector, original collector number, type locality, and remarks as appropriate. Digital photographs of each specimen will serve as a condition report and will be attached to each electronic specimen record.

  16. Catalog of type specimens of recent mammals: Rodentia (Myomorpha, Anomaluromorpha, and Hystricomorpha) in the National Museum of Natural History, Smithsonian Institution

    Science.gov (United States)

    Fisher, Robert D.; Ludwig, Craig A.

    2014-01-01

    The type collection of Recent mammals in the Division of Mammals, National Museum of Natural History, Smithsonian Institution, contains 945 specimens bearing names of 931 species-group taxa of Rodentia (Myomorpha, Anomaluromorpha, and Hystricomorpha) as of August 2013. This catalog presents an annotated list of these holdings comprised of 905 holotypes, 16 lectotypes, 8 syntypes (48 specimens), and 2 neotypes. In addition, we include 44 specimens that are part of syntype series that should be in the collection but cannot be found or are now known to be in other collections. One hundred and ten of the names are new since the last type catalog covering these suborders A lectotype for Mus peruvianus Peale, 1848, is newly designated herein. Nine specimens previously reported were subsequently sent to the vertebrate paleontology collection and are not included here. Suborders and families are ordered as in Carleton and Musser; within families, currently recognized genera are arranged alphabetically; within each currently recognized genus, accounts are arranged alphabetically by original published name. Information in each account includes original name and abbreviated citation thereto, current name if other than original, citation for first use of current name combination for the taxon (or new name combination if used herein for the first time), type designation, U.S. National Museum catalog number(s), preparation, age and sex, date of collection and collector, original collector number, type locality, and remarks as appropriate. Digital photographs of each specimen will serve as a condition report and will be attached to each electronic specimen record.

  17. Rodentia and lagomorpha

    Science.gov (United States)

    Sheffield, S.R.; Sawicka-Kapusta, K.; Cohen, J.B.; Rattner, B.A.; Shore, Richard F.; Rattner, Barnett A.

    2001-01-01

    This comprehensive review examines the extensive literature on wild rodents and lagomorphs as biomonitors of environmental contamination. This chapter covers studies dealing with exposure and effects of environmental contaminants on rodent and lagomorph species, including pesticides (organochlorines, organophosphorus and carbamate compounds, herbicides, plant growth regulators, fungicides, and rodenticides), other organic chemicals, metals, radionuclides, and other miscellaneous contaminants. Many research needs become evident when reviewing ecotoxicological data for rodents and lagomorphs, the most striking being the paucity of information on rodent families other than Muridae (mice and rats). While our ability to qualitatively extrapolate effects observed in laboratory studies to field situations is good for a variety of contaminants, quantitative predictions of dose-response relationships are poor because inter-specific variation and differences in exposure patterns between laboratory and wild species to toxicants are for the most part unknown. More sophisticated comparative toxicity studies need to be undertaken that build on previous work in order to develop a database of information, to account for and model differences in exposure pathways, to document interactions among multiple stressors, to generate data establishing thresholds, critical concentrations, and diagnostic guidelines, and even to develop physiologically-based toxicokinetic models. Such efforts may enhance our ability to predict effects on wild populations, including threatened and endangered species.

  18. Identification of three Iranian species of the genus Rattus (Rodentia, Muridae using a PCR-RFLP technique on mitochondrial DNA

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    safieh Akbary rad

    2009-11-01

    Full Text Available Abstract Three species of the genus Rattus Fisher, 1803 have been reported from Iran: the brown rat (R. norvegicus, the black rat (R. rattus and the Himalayan rat (R. pyctoris. The first two were introduced, whilst R. pyctoris is native and lives in mountainous regions from Pakistan to north-eastern Iran. In this study, the mitochondrial DNA from twenty six rats were analysed using a PCR-RFLP (Polymerase Chain Reaction - Restriction Fragments Length Polymorphism method to investigate inter-specific variation. Part of the 16S rRNA and cytochrome b genes were amplified and digested with three restriction enzymes: AluI, MboI and HinfI. Restriction fragments resulted in four different haplotypes and allowed to distinguish the three Rattus species. Our results suggest that the Himalayan rats are more closely related to R. rattus than to R. norvegicus and provide the basics for further phylogenetic studies. Riassunto Identificazione di tre specie iraniane del genere Rattus (Rodentia, Muridae tramite PCR-RFLP su DNA mitocondriale. Tre specie del genere Rattus risultano diffuse in Iran: il surmolotto (R. norvegicus, il ratto nero (R. rattus e il ratto himalayano (R. pyctoris. Le prime due specie sono state introdotte, mentre R. pyctoris è presente nelle aree montane che si sviluppano dal Pakistan all’Iran nordorientale. In questo studio, il DNA mitocondriale di 26 individui è stato analizzato tramite PCR-RFLP per evidenziare variazioni inter-specifiche. Parte dei geni del rRNA 16S e del citocromo b è stata amplificata e quindi sottoposta a digestione tramite tre diversi enzimi: AluI, MboI e HinfI. I frammenti di restrizione hanno permesso di individuare quattro aplotipi mitocondriali e di distinguere le tre specie. I risultati ottenuti suggeriscono che il ratto

  19. Tirso de Molina, Indios y Encomenderos

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    Caro López, Ceferino

    1997-08-01

    Full Text Available In the text of Tirso's Trilogía de los Pizarro elements are to be found which allow to affirm that the playwright availed himself of an occasional commission to make an instrument of political criticism aiming at false advisers and validos. Tirso fought against the novelties in the government and policy of the Inidies and stood for the abolition of the humanitarian measures of the Leyes Nuevas and the strengthening of the encomenderos' power. Thus the Trilogy presents itself as a telling instance of the mental shift between Renaissance erasmism and the crisis of the Counter-Reformation.

    En la Trilogía de los Pizarro hay elementos que permiten afirmar que el dramaturgo usó un encargo ocasional para hacer un instrumento de crítica de la política de su tiempo, poniendo en evidencia la figura de los validos y de los malos consejeros. Contra las novedades introducidas en el gobierno y en la política indiana Tirso proponía la abolición de las medidas humanitarias incluidas en las Leyes Nuevas y el fortalecimiento de la autoridad de los encomenderos. La Trilogía se presenta por lo tanto como un ejemplo del cambio cultural entre el erasmismo del Renacimiento y la crisis de la Contrarreforma.

  20. Avaliação da eficácia dos tratamentos com a associação de Sulfadiazina, Pirimetamina e Ácido folínico (SPAF), Azitromicina, infusão de Artemisia annua L. e Espiramicina na prevenção da transmissão vertical da toxoplasmose em Calomys callosus (Rodentia: Cricetidae)

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    Costa, Idessania Nazareth da

    2009-01-01

    O objetivo deste trabalho foi verificar a eficácia dos tratamentos com sulfadiazina, pirimetamina e ácido folínico (SPAF) associados, azitromicina, infusão de Artemisia annua e espiramicina na prevenção da transmissão vertical da toxoplasmose em Calomys callosus (Rodentia: Cricetidae). Fêmeas de C. callosus foram oralmente infectadas com 20 cistos de Toxoplasma gondii (cepa ME-49) no dia de detecção da rolha vaginal (primeiro dia de gestação). O tratamento com azitromicina, inf...

  1. Range expansion of Oligoryzomys longicaudatus (Rodentia, Sigmodontinae in Patagonian Chile, and first record of Hantavirus in the region Ampliación del rango de distribución de Oligoryzomys longicaudatus (Rodentia, Sigmodontinae en la Patagonia de Chile y primer registro de Hantavirus en la región

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    SEBASTIÁN BELMAR-LUCERO

    2009-06-01

    Full Text Available At present, 20 species of Oligoryzomys (Rodentia, Sigmodontinae are recognized in the Neotropical region, most of them distinguished by their karyotypes, which fluctuates between 46-70 chromosomes. Two species are currently recognized in Chile, Oligoryzomys longicaudatus (Bennet, 1832; "colilargo" or the long-tailed pygmy rice rat; 2n = 56, which ranges from 27° to approximately 51° S, and O. magellanicus (Bennet, 1836; Magellanic pygmy rice rat; 2n = 54, south of 51° S in the Patagonian region of Chile and Argentina. As part of an ongoing research on the southern Patagonia of Chile, we report the results of small mammal samplings in six localities. We karyotyped 28 specimens and we also sequenced the hypervariable mtDNA region I in 22 individuals, aligning these sequences with an under development phylogeny of O. longicaudatus. We also evaluated the serology and viral charge in all captured specimens to detect the presence of antibodies to Andes virus (ANDV through Strip Immunoblot Assay (SIA, and of viral genome by RT-PCR. The results consistently showed that the karyotype of southern Patagonia specimens was 2n = 56, equal to that of O. longicaudatus, and that individuals from this area do not differentiate phylogenetically from those of the northern range of distribution. In addition, the serology showed the presence of antibodies IgG anti-ANDV and of viral genome in heart, kidney, spleen, and lungs of a single specimen of Oligoryzomys from the locality of Fuerte Bulnes in the Magallanes region. We conclude that all specimens trapped south of 51° S correspond to Oligoryzomys longicaudatus, thus expanding the distribution of this specie! from 51° to at least 55° S. The results also extended the disiribution of the Andes strain of Hantavirus to southernmost Patagonia.Actualmente se reconocen 20 especies de Oligoryzomys (Rodentia, Sigmodontinae en la región Neotropical, la mayoría de ellas distinguidas por sus cariotipos, los que fluct

  2. Mammal prey of the Barn Owl (Tyto alba) in Parque Luro Reserve, La Pampa, Argentina

    OpenAIRE

    1994-01-01

    Abstract The diet of the barn owl was studied through the analysis of pellets obtained in various sites within the Parque Luro reserve, located in an area of xerophyte Caldén forests. The study of 1241 prey items revealed a high dominance of the cricetid rodents Calomys sp., Akodon molinae and Eligmodontia typus, followed by other 8 species of rodents, one species of marsupial and undetermined birds a...

  3. Case 3058. Arctocephalus F. Cuvier, 1826 and Callorhinus Gray, 1859 (Mammalia, Pinnipedia): proposed conservation by the designation of Phoca pusilla Schreber, [1775] as the type species of Arctocephalus; and Otaria Peron, 1816 and Eumetopias Gill, 1866: proposed conservation by the designation of Phoca leonina Molina, 1782 as the type species of Otaria

    Science.gov (United States)

    Gardner, A.L.; Robbins, C.B.

    1999-01-01

    The purpose of this application is to conserve the accustomed understanding and usage of the fur seal name Arctocephalus F. Cuvier, 1826 by the designation of Phoca pusilia Schreber, [1775] as the type species, thus conserving also the name Callorhinus Gray, 1859. At present Phoca ursina Linnaeus, 1758 is the valid type species of both Arctocephalus and Callorhinus. The name Arctocephalus relates to a genus of some seven fur seals from the southern hemisphere, while Callorhinus is used for the single species C. ursinus (Linnaeus) from the northern hemisphere. It is also proposed that the universal understanding of the names Otaria Peron, 1816 and Eumetopias Gill, 1866 should be conserved for the southern and northern sea lions respectively by designating Phoca leonina Molina, 1782 (for which the valid specific name is P. byronia de Blainville, 1820) as the type species of Otaria. At present Phoca jubata Schreber, [1776] is the type species of Otaria and the name Otaria is a senior subjective synonym of Eumetopias. The four genera Arctocephalus, Callorhinus, Otaria and Eumetopias are all placed in the family OTARIIDAE Gray, 1825.

  4. Seasonal effects on the hematology and blood plasma proteins of two species of mice Mus musculus domesticus and M. spretus (Rodentia: Muridae from Portugal

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    António Mira

    1994-05-01

    Full Text Available Abstract Blood samples were taken from Mus musculus domesticus (Rutty, 1772 and M. spretus (Lataste, 1883, live-trapped at one month intervals, from September 88 to July 89, in the district of Lisbon, Portugal. The seasonal hematological variations in the commensal species, M. musculus domesticus, were characterized by an increase in red blood cells, hemoglobin and hematocrit values in winter which reverse during summer. On the contrary, in M. spretus hematocrit values slightly change throughout the year. In both species the albumin/globulin ratio was low in spring and high in autumn. These results were analysed and discussed taking into account environmental factors and physiological conditions of mice. Riassunto Effetti stagionali sull'ematologia e le proteine del plasma di Mus musculus domesticus e M. spretus (Rodentia: Muridae in Portogallo - I campioni di sangue provengono da individui di Mus musculus domesticus (Rutty, 1772 e M. spretus (Lataste, 1883. Gli animali sono stati catturati vivi ogni mese, da settembre 88 a luglio 89, nel distretto di Lisbona, in Portogallo. Le variazioni stagionali ematologiche nella specie commensale, M. m. domesticus, sono caratterizzate da un incremento di cellule rosse del sangue, di emoglobina e dei valori di ematocrito in inverno che assumono un andamento opposto in estate. Al contrario, in M. spretus i valori di ematocrito non cambiano sensibilmente durante tutto l'anno. In entrambe le specie il rapporto albumina/globulina risulta basso in primavera e alto in autunno. Questi risultati sono stati analizzati e discussi tenendo conto dei fattori ambientali e le condizioni fisiologiche dei topi.

  5. Karyotype composition of some rodents and marsupials from Chapada Diamantina (Bahia, Brasil

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    LG. Pereira

    Full Text Available The Chapada Diamantina (CD is located in Bahia State, between 11-14° S and 41-43° W, being part of the Serra do Espinhaço. The occurrence of different habitats and transition areas permits an interesting mammal fauna composition, with species from different biomes living in sympatry. Species of Didelphimorphia and Rodentia are important members of mammal communities in almost all different habitats, and morphological and cytogenetic characters are important for a correct identification of most of these species. In this work 258 specimens of small mammals from the orders Didelphimorphia (six genera and six species and Rodentia (two families, five Sigmodontinae tribes, nine genera and 11 species were collected during the whole field work (44 nights with traps. Chromosome preparations were obtained from 145 specimens from the species: Marmosops incanus, Gracilinanus microtarsus, Monodelphis domestica, Akodon aff. cursor, Necromys lasiurus, Cerradomys sp., Oligoryzomys fornesi, O. nigripes, O. rupestris, Calomys expulsus, Rhipidomys macrurus, Wiedomys pyrrhorhinus and Thrichomys inermis. Didelphis albiventris, Micoureus demerarae, Thylamys karymii and Nectomys sp. were identified by morphological characters. Most analyzed specimens do not show karyotype variation. However, numerical chromosomic variation was found in two individuals of Akodon aff. cursor (2n = 15 and in one individual of Cerradomys sp. (2n = 51. Structural variation in karyotype was observed in seven individuals of Cerradomys sp., showing one additional pair of metacentric chromosomes.

  6. Aproximación a la confrontación jurídico-económica entre María de Molina y las aljamas castellanas a finales del siglo XIII y principios del siglo XIV

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    Rica AMRAN

    2006-01-01

    Full Text Available Ce travail a été conçu dans une perspective bien précise : l’aspect historiographique de la question, introduit par les chroniques. Toutefois, à cause du laconisme de ces textes, et bien que la base de notre étude soit le récit historiographique des règnes de Sanche IV et de Ferdinand IV, nous avons aussi utilisé la documentation des cortès et celle de la collection Burriel. D’autres documents, relatifs à des conciles et à des synodes, proviendront de la jurisprudence ecclésiastique. Nous évoquerons d’abord les communautés juives castillanes dans leur situation interne (sociale et spirituelle et analyserons la situation économique à laquelle la majorité de leurs membres fut soumise, avant de passer au coeur de notre propos : les relations de Marie de Molina avec les juifs (points communs avec les époques antérieures, changements provoqués par la reine et enfin signification de sa politique envers cette minorité et impact de celle-ci au XIVe siècle.El presente trabajo ha sido concebido bajo una visión bien dirigida : la vertiente historiográfica que introducen las crónicas. Sin embargo y debido a la parquedad de las mismas, y aunque las bases serán estas, las del periodo de Sancho IV y Fernando IV, me he permitido también utilizar los documentos de Cortes, al mismo tiempo que algunos sobre el periodo insertos en la colección Burriel ; otros provendrán de la jurisprudencia eclesiástica, relativos a concilios y sínodos. Y ya en un segundo plano trabajaremos sobre las aljamas castellanas (situación social y espiritualidad desde un punto de vista interno ; analizaremos desde la óptica de la mayoría la situación económica a los que estos se vieron sometidos y por último, lo que será el centro de nuestro estudio, la relación de María de Molina con la comunidad judía : los puntos comunes con épocas anteriores, los cambios que esta realiza en su relación con la comunidad, para concluir con lo que

  7. SPECIES DIVERSITY OF LONG GOURD LAGENARIA SICERARIA (MOLINA STANDL

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    Tsatsenko L. V.

    2014-01-01

    Full Text Available The issues of international spread of fruits of long gourd lagenaria and the introduction of it in culture are considered in the article. We have shown how to use it as a vegetable crop and considered varietal diversity of this species. The biological characteristics of lagenaria cultivation as vegetable plants, including peculiarities of the reproductive system have been marked. We have also considered the issues of cultivation and distribution of long gourd lagenaria (zycca for food

  8. Ocular comparative anatomy of the family Rodentia.

    Science.gov (United States)

    Rodriguez-Ramos Fernandez, Julia; Dubielzig, Richard R

    2013-07-01

    There is little information regarding ocular anatomy and histology in many of the rodent species. Histological analyses for morphologic features were performed in 31 globes from 18 rodent species submitted to and archived at the Comparative Ocular Pathology Laboratory of Wisconsin. The following measurements were taken: thickness of the cornea, corneal epithelium, corneal stroma, Descemet's membrane, and retina. H&E sections were evaluated for the following anatomical features: presence of pigmented epithelial cells in the peripheral cornea, presence and location of Schlemm's canal, presence of iridal sphincter and dilator and ciliary body muscles, presence of pars plicata and plana, presence of retinal vessels, presence of lamina cribrosa, and presence of tapetum lucidum. The springhaas was the only rodent in our collection that presented a well-developed tapetum lucidum fibrosum. The presence of retinal vessels was variable: vessels were observed in all of the members of the mouse-related clade, except the springhaas and the beaver, in all of the squirrel-related clade members, and in none of the Ctenohystrica. In the flying squirrels, blood vessels extended to the outer limiting membrane in the photoreceptor layer. Beavers, chinchillas, capybara, and guinea pigs lacked vessels within the retina; however, they had vessels within the optic nerve head. Ground squirrels have an optic nerve head, which is linear in the horizontal plane and an asymmetric retina. The tree-dwelling squirrels have a rounded but still elongated optic nerve, and the flying squirrel has a round optic nerve head like all the other rodents.

  9. A new karyotype of Calomys (Rodentia, Sigmodontinae

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    Lima J. Fernando de S.

    2001-01-01

    Full Text Available The genus Calomys Waterhouse, 1837 is widely distributed within South America, being found in Venezuela, Colombia, Peru, Bolivia, Brazil, Paraguay, Uruguay and Argentina. Specimens of Calomys were collected in Formoso do Araguaia, Tocantins, Brazil. For chromosome characterization standard staining techniques and as G-banding and nucleolar organizer region were used. The karyotype was 2n=46 and AN=66. The X chromosome is a medium metacentric and the Y chromosome a small acrocentric chromosome. Chromosome homologies with other species were observed. Probably, karyotype differences were basically due to Robertsonian rearrangements.

  10. Mammal prey of the Barn Owl (Tyto alba in Parque Luro Reserve, La Pampa, Argentina

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    Sergio Tiranti

    1994-05-01

    Full Text Available Abstract The diet of the barn owl was studied through the analysis of pellets obtained in various sites within the Parque Luro reserve, located in an area of xerophyte Caldén forests. The study of 1241 prey items revealed a high dominance of the cricetid rodents Calomys sp., Akodon molinae and Eligmodontia typus, followed by other 8 species of rodents, one species of marsupial and undetermined birds and anuran amphibians. For comparing the diets from a relatively undisturbed forested area (Parque Luro and a deforested site, two subcollections of pellets were analyzed. Differences in FNB values and in the prevalence and composition of prey assemblages were observed between these areas. Riassunto Mammiferi predati dal Barbagianni (Tyto alba nella Riserva Parque Luro, La Pampa, Argentina - La dieta del Barbagianni (Tyto alba è stata studiata attraverso l'analisi delle borre ottenute in varie località all'interno della riserva Parque Luro, situata in un'area con boschi xerofili a Prosopis caldenia. Lo studio di 1241 campioni ha rivelato un'elevata prevalenza di roditori cricetidi Calomys sp., Akodon molinae and Eligmodontia typus, seguiti da altre 8 specie di roditori, una specie di marsupiali e uccelli e anfibi anuri indeterminati. Per il confronto delle diete sono state analizzate due sub-raccolte di borre di rapaci provenienti da un'area boscata relativamente indisturbata e da un sito disboscato. In queste aree sono state osservate differenze nei valori della FNB e nella prevalenza e composizione delle prede.

  11. Branch whorls of juvenile Araucaria araucana (Molina Koch: are they formed annually? Los verticilos de juveniles de Araucaria araucana (Molina Koch: ¿son formados anualmente?

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    CHRISTOPHER H. LUSK

    2000-09-01

    Full Text Available The growth of Araucaria araucana, like that of many other conifers, is characterised by the production of a monopodial stem with branch whorls. However, the periodicity of whorl formation in this species has not been subjected to systematic study. We used growth ring counts to determine the frequency of whorl formation in sun- and shade-grown juvenile A. araucana in a montane forest in the Chilean coast range. Whorls were not annual in any of the 35 individuals studied, growth rings outnumbering whorls by a factor of 1.8 to 3.9. The mean interval between successive whorls was significantly shorter in sun-grown (2.1 yrs whorl -1 than in shade-grown trees (2.6 yrs whorl-1, suggesting a relationship with plant carbon balance. Mean distance between whorls was also sensitive to light environment. The overall result of this effect of light environment on both whorl spacing and production rate was that mean height growth rates were > 50% higher in sun-grown trees (169 mm yr-1 than in shade-grown individuals (111 mm yr-1. Despite the non-annual nature of whorls in the study population, whorl counts may have some potential as a non-invasive method of age estimation in juvenile A. araucana. In both shade- and sun-grown subpopulations, whorl number was a better predictor of stem age than were stem diameter or heightEl crecimiento de A. araucana, al igual que el de muchas otras coníferas, se caracteriza por la producción de un fuste monopódico y ramas en verticilos. Sin embargo, en esta especie, no se ha investigado sistemáticamente la periodicidad de la formación de los verticilos. Esta nota documenta el conteo de anillos de crecimiento para determinar la frecuencia de formación de verticilos, en árboles juveniles de A. araucana. Se muestrearon 17 árboles en ambientes soleados y otros 18 bajo sombra, en un bosque montano de la Cordillera de la Costa, Chile. Ninguno de los 35 individuos estudiados mostró evidencias de formación anual de verticilos, puesto que el número de anillos de crecimiento excedió al número de verticilos en 1,8 a 3,9 veces. El intervalo promedio entre la producción de verticilos sucesivos fue significativamente menor en individuos expuestos a pleno sol (2,1 años verticilo-1 que en aquellos que crecieron bajo sombra (2,6 años verticilo-1, sugiriendo cierta relación con el balance de carbono de la planta. La distancia promedio entre verticilos también se mostró sensible al ambiente lumínico. El resultado de este efecto del ambiente lumínico sobre tanto la tasa de producción de verticilos, como la distancia entre éstos, fue que la tasa promedio de crecimiento en altura de los individuos soleados (169 mm año-1 excedió en > 50% a la de los individuos sombreados (111 mm año-1. A pesar de la naturaleza no anual de los verticilos en la población estudiada, los recuentos de verticilos pueden tener potencial como un método no invasivo de estimación de edad para juveniles de A. araucana. Tanto dentro de las subpoblaciones soleadas como sombreadas, el número de verticilos fue mejor indicador de la edad que el diámetro o la altura del fuste

  12. Reestablecimiento de Choromytilus chorus (Molina, 1782) (Bivalvia: Mytilidae) en el norte de Chile Reestablishment of Choromytilus chorus (Molina, 1782) (Bivalvia: Mytilidae) in northern Chile

    OpenAIRE

    Miguel Avendaño; Marcela Cantillánez

    2011-01-01

    Hasta fines del siglo pasado no existían registros de la presencia de Choromytilus chorus al norte de los 23°S, pese a antecedentes que señalaban su existencia en épocas pasadas. Ciertos cambios relacionados con las masas de agua costeras de esta zona, habrían generado la ausencia o escasez que presentaba el entorno costero actual. Sin embargo, hace una década atrás, su presencia en el norte de Chile, comienza a tener connotación pesquera. En el presente trabajo se confirma su reestablecimien...

  13. Reestablecimiento de Choromytilus chorus (Molina, 1782 (Bivalvia: Mytilidae en el norte de Chile Reestablishment of Choromytilus chorus (Molina, 1782 (Bivalvia: Mytilidae in northern Chile

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    Miguel Avendaño

    2011-07-01

    Full Text Available Hasta fines del siglo pasado no existían registros de la presencia de Choromytilus chorus al norte de los 23°S, pese a antecedentes que señalaban su existencia en épocas pasadas. Ciertos cambios relacionados con las masas de agua costeras de esta zona, habrían generado la ausencia o escasez que presentaba el entorno costero actual. Sin embargo, hace una década atrás, su presencia en el norte de Chile, comienza a tener connotación pesquera. En el presente trabajo se confirma su reestablecimiento en las regiones de Antofagasta y Tarapacá, mediante prospecciones realizadas en seis lugares donde se registró su presencia, así como mediante la captación de semilla en colectores suspendidos. Se indica interacción con Aulacomya ater, a la cual ha desplazado a estratos más profundos, mientras que su reestablecimiento, iniciado en las regiones de Atacama y Antofagasta, y que se amplió posteriormente a la región de Tarapacá; permite postular la hipótesis que la dinámica de estos bancos, respondería a una estructura de metapoblación, dado el sistema de corrientes y vientos que predominan en la zona norte, permitiendo la advección larval de poblaciones existentes en la región de Coquimbo.Despite indications of its presence in past ages, until the end of the last century, no records showed Choromytilus chorus north of 23°S. Certain changes related to coastal water masses in the zone could be responsible for the present lack or scarcity of this species in the coastal area. However, a decade ago, this species appeared in northern Chile in the context of fisheries. This study confirms the re-establishment of C. chorus in the Antofagasta and Tarapaca regions through surveys at six sites where the species had been registered and spat collection using suspended collectors. This species has interacted with Aulacomya ater, displacing it towards deeper habitats. The re-establishment of C. chorus began in the Atacama and Antofagasta regions and later extended to the Tarapaca region. Thus, we hypothesize that the dynamics of these shoals correspond to a metapopulation structure that has allowed larval advection, given the current system and predominant winds in the northern zone, from populations existing in the Coquimbo region.

  14. The adhesive protein of Choromytilus chorus (Molina, 1782) and Aulacomya ater (Molina, 1782): a proline-rich and a glycine-rich polyphenolic protein.

    Science.gov (United States)

    Burzio, L A; Saéz, C; Pardo, J; Waite, J H; Burzio, L O

    2000-06-15

    The adhesive polyphenolic proteins from Aulacomya ater and Choromytilus chorus with apparent molecular masses of 135000 and 105000, respectively, were digested with trypsin and the peptides produced resolved by reversed phase liquid chromatography. About 5 and 12 major peptides were obtained from the protein of A. ater and C. chorus, respectively. The major peptides were purified by reverse-phase chromatography and the amino acid sequence indicates that both polyphenolic proteins consisted of repeated sequence motifs in their primary structure. The major peptides of A. ater contain seven amino acids corresponding to the consensus sequence AGYGGXK, whereas the tyrosine was always found as 3, 4-dihydroxyphenylalanine (Dopa), the X residue in position 6 was either valine, leucine or isoleucine, and the carboxy terminal was either lysine or hydroxylysine. On the other hand, the major peptides of C. chorus ranged in size from 6 to 21 amino acids and the majority correspond to the consensus sequence AKPSKYPTGYKPPVK. Both proteins differ markedly in the sequence of their tryptic peptides, but they share the common characteristics of other adhesive proteins in having a tandem sequence repeat in their primary structure.

  15. [Parasite nematodes from Dusycion griseus (Gray, 1837), D. culpaeus (Molina, 1782) and Conepatus chinga (Molina, 1782) (Mammalia:Carnivora) in Neuquén, Argentina. Systematics and ecology].

    Science.gov (United States)

    Stein, M; Suriano, D M; Novaro, A J

    1994-01-01

    Four nematode species (Physaloptera clausa Rudolphi, 1819; Ph. maxillaris Molin, 1860; Protospirura numidica criceticola Quentin, Karimi and Rodrigues De Almeida, 1968; Toxascaris leonina (Von Linstow, 1902) were collected from D. griseus, D. culpaeus and C. chinga in Neuquen Province, Argentina. These hosts were captured from April to August in 1990 and 1991. Ph. clausa and Ph. maxillaris ar redescribed. The systematic position of Ph. clausa is discussed and the authors conclude that this species could be considered the type species of the genus. The possibility that D. griseus and D. culpaeus could be the accidental hosts for P. n. criceticola is discussed. Prevalence, mean intensity and frequency of each species are given. These parameters were related with the diets of the hosts and the parasite life cycles. There was no relationship between parasitic burden of each host and their nutritional condition (Kendall Tau Test). Significant differences exist among the diet of each host and among prevalence values of each parasite species (Homogeneity Test SYSTAT Program).

  16. Late Pleistocene voles (Arvicolinae, Rodentia) from the Baranica Cave (Serbia)

    Science.gov (United States)

    Bogićević, Katarina; Nenadić, Draženko; Mihailović, Dušan

    2012-02-01

    Baranica is a cave system situated in the south-eastern part of Serbia, four kilometers south to Knjaževac, on the right bank of the Trgovi\\vski Timok. The investigations in Baranica were conducted from 1994 to 1997 by the Faculty of Philosophy from Belgrade and the National Museum of Knjaževac. Four geological layers of Quaternary age were recovered. The abundance of remains of both large and small mammals was noticed in the early phase of the research. In this paper, the remains of eight vole species are described: Arvicola terrestris (Linnaeus, 1758), Chionomys nivalis (Martins, 1842), Microtus (Microtus) arvalis (Pallas, 1778) and Microtus (Microtus) agrestis (Linnaeus, 1761), Microtus (Stenocranius) gregalis (Pallas, 1779), Microtus (Terricola) subterraneus (de Sélys-Longchamps, 1836), Clethrionomys glareolus (Schreber, 1780) and Lagurus lagurus (Pallas, 1773). Among them, steppe and open area inhabitants prevail. Based on the evolutionary level and dimensions of the Arvicola terrestris molars, as well as the overall characteristics of the fauna, it was concluded that the deposits were formed in the last glacial period of the Late Pleistocene. These conclusions are rather consistent with the absolute dating of large mammal bones (23.520 ± 110 B.P. for Layer 2 and 35.780 ± 320 B.P. for Layer 4).

  17. Dietary ecology of Murinae (Muridae, Rodentia): a geometric morphometric approach.

    Science.gov (United States)

    Gómez Cano, Ana Rosa; Hernández Fernández, Manuel; Alvarez-Sierra, M Ángeles

    2013-01-01

    Murine rodents represent a highly diverse group, which displays great ecological versatility. In the present paper we analyse the relationship between dental morphology, on one hand, using geometric morphometrics based upon the outline of first upper molar and the dietary preference of extant murine genera, on the other. This ecomorphological study of extant murine rodents demonstrates that dietary groups can be distinguished with the use of a quantitative geometric morphometric approach based on first upper molar outline. A discriminant analysis of the geometric morphometric variables of the first upper molars enables us to infer the dietary preferences of extinct murine genera from the Iberian Peninsula. Most of the extinct genera were omnivore; only Stephanomys showed a pattern of dental morphology alike that of the herbivore genera.

  18. Dietary ecology of Murinae (Muridae, Rodentia: a geometric morphometric approach.

    Directory of Open Access Journals (Sweden)

    Ana Rosa Gómez Cano

    Full Text Available Murine rodents represent a highly diverse group, which displays great ecological versatility. In the present paper we analyse the relationship between dental morphology, on one hand, using geometric morphometrics based upon the outline of first upper molar and the dietary preference of extant murine genera, on the other. This ecomorphological study of extant murine rodents demonstrates that dietary groups can be distinguished with the use of a quantitative geometric morphometric approach based on first upper molar outline. A discriminant analysis of the geometric morphometric variables of the first upper molars enables us to infer the dietary preferences of extinct murine genera from the Iberian Peninsula. Most of the extinct genera were omnivore; only Stephanomys showed a pattern of dental morphology alike that of the herbivore genera.

  19. Pericentric satellite DNA and molecular phylogeny in Acomys (Rodentia).

    Science.gov (United States)

    Kunze, B; Traut, W; Garagna, S; Weichenhan, D; Redi, C A; Winking, H

    1999-01-01

    Satellite DNAs (stDNAs) of four Acomys species (spiny-mice), A. cahirinus, A. cineraceus, A. dimidiatus and A. russatus, belong to closely related sequence families. Monomer sizes range from 338 to 364 bp. Between-species sequence identity was from 81.0% to 97.2%. The molecular phylogeny of the sequences helps to clarify the taxonomy of this 'difficult' group. The A. dimidiatus genome contains about 60000 repeats. According to the restriction patterns, repeats are arranged in tandem. The stDNA maps to the centromeric heterochromatin of most autosomes, both acrocentric and metacentric, but appears to be absent in the centromeric region of Y chromosomes. A well-conserved centromere protein B (CENP-B) box is present in the stDNA of A. russatus while it is degenerated in the other species.

  20. [Ovarian activity of Agouti paca (Rodentia: Agoutidae) under captivity].

    Science.gov (United States)

    Montes Pérez, Rubén C; Cabrera Baz, Elsy A

    2006-09-01

    The ovarian activity of Agouti paca was characterized by hormonal profiles and ovarian structures. Samples of blood were taken from eight females (seven adults and one juvenile) at the breeding grounds of the Facultad de Medicina Veterinaria y Zootecnia in Yucatśn, Mexico. Sampling lasted approximately two months and was done every three and six days. Blood was collected from anesthetized animals, and the levels of progesterone (P4) and 17 beta estradiol (E2) were analized by radioimmunoassay technique. Macroscopic and microscopic analyses were carried out in ovaries of dead animals. The estrous cycle lasted 29+/-8.4 days, levels of 1.61+/-0.65 ng/ml for P4 and 39+/-24 pg/ml for E2 were observed for a follicular phase, 6.18+/-3.70 ng/ml and 29+/-16 pg/ml for P4 and E2 respectively in the luteal phase. Statistically significant differences were found between phases for P4 but not for E2. The presence of extragonadal steroids with levels of P4 of 1.9+/-0.77 ng/ml and E2 of 22+/-17 pg/ml were observed, which are not produced by the effects of managing stress. The changes in the levels of P4 during the cycle are indicators of luteal activity, with the intersticial tissue acting probably as active steroids-producing gland. Follicular growth was observed during the entire cycle.

  1. Phylogeographic study of Apodemus ilex (Rodentia: Muridae in Southwest China.

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    Qi Liu

    Full Text Available BACKGROUND: The Mountains of southwest China have complex river systems and a profoundly complex topography and are among the most important biodiversity hotspots in the world. However, only a few studies have shed light on how the mountains and river valleys promote genetic diversity. Apodemus ilex is a fine model for investigating this subject. METHODOLOGY/PRINCIPAL FINDINGS: To assess the genetic diversity and biogeographic patterns of Apodemus ilex, the complete cytochrome b gene sequences (1,140 bp were determined from 203 samples of A. draco/ilex that were collected from southwest China. The results obtained suggested that A. ilex and A. draco are sistergroups and diverged from each other approximately 2.25 million years ago. A. ilex could be divided into Eastern and Western phylogroups, each containing two sub-groups and being widespread in different geographical regions of the southern Hengduan Mountains and the western Yunnan - Guizhou Plateau. The population expansions of A. ilex were roughly from 0.089 Mya to 0.023 Mya. CONCLUSIONS: Our result suggested that A. ilex is a valid species rather than synonym of A. draco. As a middle-high elevation inhabitant, the phylogenetic pattern of A. ilex was strongly related to the complex geographical structures in southwest China, particularly the existence of deep river valley systems, such as the Mekong and Salween rivers. Also, it appears that the evolutionary history of A. ilex, such as lineage divergences and population expansions were strongly affected by climate fluctuation in the Late Pleistocene.

  2. First report of partial albinism in genus Thrichomys (Rodentia: Echimyidae

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    Antonio Carlos da S.A. Neves

    2014-01-01

    Full Text Available Reports about albinism in rodents are common. In the family Echimyidae, however, albinism is very rare. This is the second case of coat color variation reported within Echimyidae and the first for the genus Thrichomys. The pelages of Thrichomys pachyurus individuals with normal and variant coat color were observed under a fluorescent artificial light and were examined with a stereoscopic microscope. The descriptions of pelage color were based on the book "Color Standards and Color Nomenclature". The predominantly white pattern of coat color in individuals of T. pachyurus suggests a partial albinism caused by delay in migration time of melanoblasts from neural crest to epidermis. The habitat of T. pachyurus has a heavy vegetative cover, which offers natural protection against predators and high-quality nutrition.

  3. RAPD analysis of Nectomys squamipes (Rodentia, Sigmodontinae populations

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    Almeida Francisca C.

    2000-01-01

    Full Text Available Random amplified of polymorphic DNA (RAPD analysis was used to assess genetic distance and the genetic structure of populations of Nectomys squamipes, a semiaquatic rodent species distributed along watercourses. DNA samples of five populations were analyzed using three primers, producing 45 scorable bands, 31 of which were polymorphic. There was a significant differentiation among populations [F ST = 0.17; phiST = 0.14 (P < 0.004] but gene flow (Nm = 1.25 was sufficient to overcome genetic drift effects. No fixed specific markers were found for any population. The Mantel's test and UPGMA cluster analysis showed a lack of relationship between genetic and geographic distances. The apparent homogeneity indicated by RAPD markers coincided with morphometric data, despite the wide geographic range of N. squamipes. Alternative hypotheses for explaining our results include recurrent processes of local extinction and recolonization or a recent and sudden increase in the geographic distribution of this species.

  4. Children's Attitudes towards Animals: Evidence from the RODENTIA Project

    Science.gov (United States)

    Fonseca, Maria Joao; Franco, Nuno H.; Brosseron, Francis; Tavares, Fernando; Olsson, I. Anna S.; Borlido-Santos, Julio

    2011-01-01

    The instructional use of animals is a popular strategy to engage students with science, enhance their motivation, and promote values such as respect, tolerance, and empathy for all living beings. Although these beneficial outcomes are widely acknowledged, research has not provided reliable indicators of their efficiency. Therefore, it is essential…

  5. Spatial patterns in Mastomys natalensis in Tanzania (Rodentia, Muridae)

    DEFF Research Database (Denmark)

    Leirs, Herwig; Verheyen, Walter; Verhagen, Ron

    1996-01-01

    in periods without reproduction, indicated a high degree of dispersal. Resident animals had a limited home range with most movements within 30 m of the burrow; however, excursions and movements over large distances were observed. Animals living on the border of maize fields and fallow land are active in both...

  6. Late Pleistocene echimyid rodents (Rodentia, Hystricognathi) from northern Brazil.

    Science.gov (United States)

    Ferreira, Thais M F; Olivares, Adriana Itati; Kerber, Leonardo; Dutra, Rodrigo P; Avilla, Leonardo S

    2016-06-07

    Echimyidae (spiny rats, tree rats and the coypu) is the most diverse family of extant South American hystricognath rodents (caviomorphs). Today, they live in tropical forests (Amazonian, coastal and Andean forests), occasionally in more open xeric habitats in the Cerrado and Caatinga of northern South America, and open areas across the southern portion of the continent (Myocastor). The Quaternary fossil record of this family remains poorly studied. Here, we describe the fossil echimyids found in karst deposits from southern Tocantins, northern Brazil. The analyzed specimens are assigned to Thrichomys sp., Makalata cf. didelphoides and Proechimys sp. This is the first time that a fossil of Makalata is reported. The Pleistocene record of echimyids from this area is represented by fragmentary remains, which hinders their determination at specific levels. The data reported here contributes to the understanding of the ancient diversity of rodents of this region, evidenced until now in other groups, such as the artiodactyls, cingulates, carnivores, marsupials, and squamate reptiles.

  7. Late Pleistocene echimyid rodents (Rodentia, Hystricognathi from northern Brazil

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    THAIS M.F. FERREIRA

    2016-06-01

    Full Text Available ABSTRACT Echimyidae (spiny rats, tree rats and the coypu is the most diverse family of extant South American hystricognath rodents (caviomorphs. Today, they live in tropical forests (Amazonian, coastal and Andean forests, occasionally in more open xeric habitats in the Cerrado and Caatinga of northern South America, and open areas across the southern portion of the continent (Myocastor. The Quaternary fossil record of this family remains poorly studied. Here, we describe the fossil echimyids found in karst deposits from southern Tocantins, northern Brazil. The analyzed specimens are assigned to Thrichomys sp., Makalata cf. didelphoides and Proechimys sp. This is the first time that a fossil of Makalata is reported. The Pleistocene record of echimyids from this area is represented by fragmentary remains, which hinders their determination at specific levels. The data reported here contributes to the understanding of the ancient diversity of rodents of this region, evidenced until now in other groups, such as the artiodactyls, cingulates, carnivores, marsupials, and squamate reptiles.

  8. Nests of the Brazilian squirrel Sciurus ingrami Thomas (Rodentia, Sciuridae Ninhos do esquilo brasileiro Sciurus ingrami Thomas (Rodentia, Sciuridae

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    Cibele A. Alvarenga

    2005-09-01

    Full Text Available Descriptions of Sciurus ingrami Thomas, 1901 nests are not available in the literature. In this study, a survey was made of the distribution of S. ingrami nests in a woodlot located near to the headquarters of the Serra do Caraça Reserve, in state of Minas Gerais, where there is a high concentration of Syagrus romanzoffiana (Chamisso Glassman palm tree, among other exotic tree species. The nest-building behaviour and the nest characteristics, such as height from the ground, total circumference, diameter of the entrance, and the position of the nest in the tree - in the crown, along the trunk or in a side branch, were described.Não existe na literatura a descrição de ninhos de Sciurus ingrami Thomas, 1901. Neste estudo, foi examinada a distribuição espacial de ninhos desta espécie, localizados em área de vegetação de crescimento secundário, próxima a área construída da Reserva Particular do Patrimônio Natural Serra do Caraça, Minas Gerais, onde há grande concentração da palmeira Syagrus romanzoffiana (Chamisso Glassman, entre outras espécies exóticas de árvores. O comportamento de construção e as características dos ninhos, tais como, altura em relação ao solo, circunferência total, diâmetro da entrada e a posição dos ninhos na árvore foram descritos.

  9. Micromammals (Insectivora; Rodentia of "Valle dell'Inferno" (Rome / Micromammiferi (Insectivora; Rodentia della Valle dell'Inferno (Roma

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    Roberto Federici

    1986-12-01

    Full Text Available Abstract A research on micromammals in the area of "Valle dell'Inferno" (in the north-west of Rome was carried out. The study was based on a previous phytosociological survey which describes a Quercus suber population in the valley (a once larger residua1 of a roman cork-tree wood which is now included in the town. Specimens from Rodents (Apodemus sylvaticus, Mus domesticus, Rattus rattus, R. norvegicus, Pitymys savii and Insectivores (Crocidura suaveolens, Erinaceus europaeus were captured by live traps. Most of Insectivores specimens are represented by C. suaveolens. Generally C. suaveolens lives in sympatry with C. leucodon but no specimens of the latter were found in this area. Three different kinds of landscape are present in the "Inferno" valley, namely, the wood, the meadow, and the bottom valley (with high anthropic impact; we have compared these three landscapes with biotic indexes (index of faunistic affinity, index of biocoenotic affinity and index of environmental evaluation. We have also compared through the same indexes, the micromammal fauna of the "Inferno" valley with six other differently polluted localities in Latium, where animals were captured with the same live traps. This area retains its natura1 environment in despite of the high anthropic impact. Riassunto È stato effettuato uno studio sulla micromammalofauna terrestre della Valle dell'Inferno situata a nord-ovest di Roma. Lo studio è basato su una precedente indagine fitosociologica effettuata per la caratterizzazione vegetazionale di una sughereta un tempo molto estesa ed ora racchiusa nell'abitato cittadino. È stato pertanto possibile tracciare, tramite gli indici biotici, una correlazione tra microteriocenosi ed effetti dell'impatto antropico.

  10. Tirso de Molina's comedy «Las Quinas de Portugal» and Salazar's censorship

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    António Apolinário Lourenço

    2015-11-01

    Full Text Available In March 1968, Portuguese censors stopped the broadcast on public television —which was the only television network at the time— of Tirso de Molina’s comedy Las quinas de Portugal. This play stages the most important creation myth for the Portuguese nation: on the eve of the battle of Ourique, a crucified Christ appeared and offered Count Afonso Henriques his five holy wounds as a symbol for the Portuguese coat of arms. In this article, I intend to understand the ethical and political reasoning of the censors who read this play, written by one of the most important playwrights of the Spanish Golden Age

  11. Reestablecimiento de Choromytilus chorus (Molina, 1782) (Bivalvia: Mytilidae) en el norte de Chile

    OpenAIRE

    Avendaño,Miguel; Cantillánez,Marcela

    2011-01-01

    Hasta fines del siglo pasado no existían registros de la presencia de Choromytilus chorus al norte de los 23°S, pese a antecedentes que señalaban su existencia en épocas pasadas. Ciertos cambios relacionados con las masas de agua costeras de esta zona, habrían generado la ausencia o escasez que presentaba el entorno costero actual. Sin embargo, hace una década atrás, su presencia en el norte de Chile, comienza a tener connotación pesquera. En el presente trabajo se confirma su reestablecimien...

  12. LAS CIENCIAS SOCIALES EN LA UCT EN 1971, POR VÍCTOR RAVIOLA MOLINA

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    Victor Raviola Molina

    2013-07-01

    Full Text Available Hasta el golpe de Estado, nuestro país se perfilaba como una «cosmópolis intelectual», exhibiendo condiciones como estabilidad política, modernización del sistema educacional universitario y gestión de redes internacionales tejidas desde algunas universidades. Esto propicia el florecimiento de centros académicos de investigación y formación, constituyendo un polo para intelectuales latinoamericanos, europeos y americanos que se insertan en estas instituciones con el objetivo de fortalecer dichas iniciativas, y analizar los procesos sociopolíticos que estaban teniendo lugar. En este contexto, y aun cuando en una condición periférica que implica sobre todo precariedad de recursos, las instituciones regionales buscaron afianzar su posición, se pensaron no sólo como instancias formativas, sino también de investigación, contribuyendo a través de la ciencia al desarrollo en el plano local.En la década de los setenta, la sede regional de la Pontificia Universidad Católica de Chile, hoy Universidad Católica de Temuco, abría un panorama auspicioso para el desarrollo de las ciencias sociales. Desde el Centro de Estudios de la Realidad Regional (CERER, y con el propósito de formar investigadores locales, se da apertura en 1971 a un programa de especialización denominado «Carrera de Investigadores en Ciencias Sociales», el que fue antesala de la fundación de la carrera de Licenciatura en Antropología en 1973, la tercera en el país y la segunda regional.Consideramos relevante este discurso pronunciado por el entonces director de Sede, don Víctor Raviola, en la inauguración anual de actividades académicas, en tanto deja testimonio de un estilo de universidad, a saber: regionalista, comprometida con la investigación científica aplicada, y vinculada con el medio local. Las palabras del profesor Raviola resultan señeras respecto del desarrollo de las ciencias sociales a nivel regional, proyecto que decae paulatinamente a partir de 1973 y que concluye con el cierre de la carrera de Antropología en 1978. En 1970 se da inicio a un proyecto que quedará inconcluso y que sólo volverá a cobrar fuerza en la década de los noventa con la apertura de las carreras de Antropología y Trabajo Social y la posterior creación de la Facultad de Ciencias Sociales en el primer decenio del siglo XXI.Agradecemos a Gloria Vergara Segura la transcripción de este texto (Héctor Mora Nawrath.

  13. Recuerdo e imaginación en Beltenebros de Antonio Muñoz Molina

    DEFF Research Database (Denmark)

    Hansen, Hans Lauge

    2004-01-01

    Nueva narrativa, novela, sujeto, búsqueda de identidad, den nye spanske roman, subjekt, identitet......Nueva narrativa, novela, sujeto, búsqueda de identidad, den nye spanske roman, subjekt, identitet...

  14. Mi Confesión. Revelaciones de un criminal de guerra (Mauricio Aranguren Molina

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    Herminia Gonzálvez Torralbo

    2007-01-01

    Full Text Available Hablar de un libro como el que paso a reseñar, implica comentar en un primer momento, qué es aquello que entendemos por confesión. Señalo esto porque cuando vemos la carátula del libro y leemos su título, el lector puede pensar que el protagonista del mismo revela voluntariamente acontecimientos de su propia vida, pero no sólo eso sino que además el lector puede pensar también que ésto s acontecimientos son relatados con el ánimo, no sólo de la revelación de una verdad, la verdad de Carlos Castaño, sino también con la intención de buscar una reconciliación (no sabría muy bien con quién pues son muchos los que han sufrido su falta de piedad por todos los crímenes cometidos. Es cierto, que cualquier tipo de confesión de un paramilitar que busque el perdón nunca se sostendrá,pero una confesión de un paramilitar es algo que llama la atención, sea esta del calibre que sea y sea cual sea el motivo de la misma.

  15. Morfología del aparato reproductor del picoroco Austromegabalanus psittacus (Molina, 1782 (Cirripedia, Balanidae

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    Catalina Contreras

    2015-07-01

    Full Text Available Descripción morfológica de las estructuras reproductivas de Austromegabalanus psittacus en dos periodos de maduración sexual. Se determinó que es un organismo hermafrodita que transfiere sus espermatozoides mediante un órgano intromitente o pene. El aparato reproductor masculino consta de testículos organizados en acinos que se distribuyen arboriformemente, dos conductos deferentes que se unen en la base del pene para formar el conducto eyaculador. El aparato reproductor femenino consiste principalmente en un ovario sacular que rodea al resto del cuerpo y se encuentra adherido a través de musculatura a la base de las placas operculares. Se organiza internamente en sacos acinares elongados que contienen ovogonias y ovocitos previtelogénicos adheridos a su pared y vitelogénicos y maduros libres dentro del lumen. Se observaron diferencias notorias en los ovarios entre los organismos recolectados en septiembre y octubre. En septiembre presentaron coloración amarillenta y en su interior se encontraron dos estructuras compactas denominadas lamelas ovígeras en cuyo interior se observaron ovocitos fecundados, embriones en diferentes estados de desarrollo y nauplius libres en la cavidad corporal; en octubre los ovarios son gruesos, blanquecinos y con gran cantidad de fluido lechoso en su interior.

  16. Morfología del aparato reproductor del picoroco Austromegabalanus psittacus (Molina, 1782) (Cirripedia, Balanidae)

    OpenAIRE

    Catalina Contreras; Nicolás Luna; Enrique Dupré

    2015-01-01

    Descripción morfológica de las estructuras reproductivas de Austromegabalanus psittacus en dos periodos de maduración sexual. Se determinó que es un organismo hermafrodita que transfiere sus espermatozoides mediante un órgano intromitente o pene. El aparato reproductor masculino consta de testículos organizados en acinos que se distribuyen arboriformemente, dos conductos deferentes que se unen en la base del pene para formar el conducto eyaculador. El aparato reproductor femenino consiste pri...

  17. Fibrinolytic activity of kaempferol isolated from the fruits of Lagenaria siceraria (Molina) Standley.

    Science.gov (United States)

    Rajput, M S; Mathur, Vineet; Agrawal, Purti; Chandrawanshi, H K; Pilaniya, Urmila

    2011-11-01

    This study was undertaken to isolate a flavonol, kaempferol, from the fruits of Lagenaria siceraria (bottle gourd) as a sole compound and to explore the fibrinolytic potential of the methanolic extract of the fruits of L. siceraria and the isolated compound using their in vitro activity. The fibrinolytic activity in terms of percentage of plasma clot liquefaction was determined by plasma clot lysis at 37°C in 24 h. The fibrinolytic activity of both substances was compared to the well-known thrombolytic agent streptokinase (30,000 IU). The percentage of fibrinolytic activity of the extract and isolated compound were found to be 54.72 ± 0.7210 and 77.37 ± 1.3010, respectively. Streptokinase was considered as the standard fibrinolytic enzyme for comparative purposes and had 91.46 ± 0.7625% fibrinolytic activity. The conclusion drawn in our study after testing the hypothesis by experimental procedures is that in vitro fibrinolytic activity on plasma clots is an inherent property of kaempferol isolated from the fruits of L. siceraria, and its comparison with streptokinase is a new aspect for further study.

  18. HEPATOPROTECTIVE ACTIVITY OF LAGENARIA SICERARIA (MOLINA STANDLEY FRUITS AGAINST PARACETAMOL INDUCED HAPATOTOXICITY IN MICE

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    C.V. Panchal*, Jyotiram A. Sawale , B. N. Poul and K.R. Khandelwal

    2013-01-01

    Full Text Available Aim and Objectives: Fruit juice of Lagenaria siceraria (LS belonging to Cucurbitaceae family, has been used traditionally to treat jaundice and to cure certain liver disorders. Antioxidants are well known for their hepatoprotective effect and in curing liver disorders. In this study, hepatoprotective and antioxidant effects of fruits were investigated. Materials and Methods: The coarsely powdered plant material was extracted successively with petroleum ether (PE and ethanol (ETH using soxhlet. PE & ETH, were then evaluated for their hepatoprotective and antioxidant activities against paracetamol induced hepatotoxicity and different in vitro assays respectively. Hepatoprotective activity was evaluated at three oral dose levels of 250, 500 and 1000 mg/kg. Results: Both extracts, PE and ETH exhibited a significant hepatoprotective and antioxidant activity. The ETH (1000 mg/kg showed maximum hepato-protection. ETH also showed better antioxidant activity, in comparison to PE, in all the antioxidant assays. Conclusions: ETH has shown better hepatoprotective activity than PE, which could be due to its better antioxidant activity. Moreover, better activity can also be attributed to the presence of phenolic compounds as these were absent in the PE.

  19. NETSUKE AS A RESOURCE OF INFORMATION ABOUT SPECIES DIVERSITY OF LAGENARIA SICERARIA (MOLINA STANDL

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    Tsatsenko L. V.

    2014-02-01

    Full Text Available In the article, with a descriptive method and a method of analysis and synthesis, we have conducted a study of species diversity of Lagenaria on the basis of a miniature sculpture of netsuke. In Japan and China, in the period from the 17th to the 20th century, the most common was 9 species. The biological peculiarities of some rare species of lagenaria has been described

  20. Organisation of autonomic nervous structures in the small intestine of chinchilla (Chinchilla laniger, Molina).

    Science.gov (United States)

    Nowak, E

    2014-08-01

    Using histochemical, histological and immunocytochemical methods, organisation of the autonomic nerve structures in small intestine of chinchilla was investigated. Myenteric plexus was localised between circular and longitudinal layers of the smooth muscles. Forming network nodes, the small autonomic, cholinergic ganglia were linked with the bundles of nerve fibres. Adrenergic structures were visible as specific varicose, rosary-like fibres forming bundles of parallel fibres connecting network nodes. Structures of the submucosal plexus formed a finer network than those of the myenteric plexus. Moreover, in 'whole-mount' specimens, fibres forming thick perivascular plexuses were also observed. Immunocytochemical studies confirmed the cholinergic and adrenergic character of the investigated structures. VAChT-positive neurones were found only in myenteric plexus, and numerous VAChT-positive and DBH-positive fibres were found in both plexuses.

  1. Respuestas foliares de Aristotelia chilensis (Molina Stuntz (Elaeocarpaceae a la fragmentación del bosque maulino Leaf responses of Aristotelia chilensis (Molina Stuntz (Elaeocarpaceae to the fragmentation of the Maulino forest

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    FIORELLA REPETTO-GIAVELLI

    2007-12-01

    Full Text Available La fragmentación que ha sufrido el bosque nativo de Chile debido a la fuerte presión antrópica ha causado, además de la grave pérdida de habitat, la modificación del microclima de los parches de bosque remanente que alguna vez constituyeron un bosque continuo de especies nativas. Estos cambios generarían respuestas morfológicas, químicas y fisiológicas en plantas capaces de adaptarse a las nuevas condiciones. Este estudio tiene como objetivo identificar respuestas a nivel de las hojas ante el aumento de radiación solar y disminución de agua en el suelo que ocurre al interior de los fragmentos. Para esto utilizamos a Aristotelia chilensis, especie que crece tanto en fragmentos como en bosque continuo, y comparamos parámetros relacionados a su morfología foliar en bosque y fragmentos y medimos su repercusión en la capacidad fotosintética de A. chilensis. En términos morfológicos, se observó una disminución del área foliar y del área foliar específica en los fragmentos, siendo 1,2 veces menor que en el bosque continuo. En los fragmentos, el grosor de la epidermis y del parénquima esponjoso son más de 1,3 veces mas gruesos que en el bosque continuo. El grosor del parénquima en empalizada, en cambio, no se vio modificado. La cantidad de nitrógeno en las hojas es 1,2 veces mayor en el bosque continuo que en los fragmentos, mientras que el contenido de carbono no varía. La conductancia estomática en el bosque continuo fue 1,5 veces mayor que en los fragmentos. Aristotelia chilensis responde morfológica y fisiológicamente ante los cambios abióticos generados por la fragmentación de los bosques, lo que le permite sobrevivir tanto en ambientes de baja luminosidad como el bosque continuo y en ambientes de alta luminosidad y bajo contenido hídrico como los fragmentos de bosque, manteniendo tasas fotosintéticas semejantes en ambos ambientesFragmentation of the Maulino forest implies significant habitat loss, as well as the modification of the microclimatic conditions of the remaining forest patches. Fragments are drier, hotter and receive more light than the continuous forest. These changes might induce morphological, chemical and physiological responses on individuals inhabiting forest patches. This study aims to identify morpho and physiological changes in Aristotelia chilensis, an evergreen tree that grows both in forest fragments and continuous forest. Leaves were 1.2 times smaller in forest fragments than in the continuous forest. Similar reduction was observed on specific leaf area (SLA. In forest fragments, the thickness of epidermis and of the spongy mesophyll was more than 1.3 times larger than that on the continuous forest, whereas the thickness of the palisade mesophyll did not differ. The amount of foliar nitrogen was 1.2 times larger in the continuous forest than in fragments, whereas the carbon content did not differ. Stomatal conductance in the continuous forest was 1.5 fold higher than that in forest fragments. Changes depicted by A. chilensis allows it to survive in environments of low luminosity as the continuous forest, and in environments of low water content as the forest fragments, maintaining similar photosynthetic rates in both environments

  2. OSTEOMETRÍA DE VICUGNA VICUGNA MOLINA, 1782 EN EL PLEISTOCENO FINAL DE PATAGONIA MERIDIONAL CHILENA: IMPLICANCIAS PALEOECOLÓGICAS Y BIOGEOGRÁFICAS / Osteometry of Vicugna vicugna Molina, 1782 in the late Pleistocene of southern chilean Patagonia

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    Rafael Labarca Encina

    2009-12-01

    Full Text Available  Se presenta un análisis osteométrico uni y multivariado con los materiales fósiles -principalmente huesos cortos y falanges- de Vicugna sp. del yacimiento Cueva Lago Sofía 4 (13500 – 11000 AP, ubicado en la provincia de Última Esperanza (Región de Magallanes, Chile. Los resultados indican que los elementos analizados poseen un tamaño compatible con los registrados para Vicugna vicugna, no superando en ningún caso a los especímenes conocidos para Vicugna gracilis del Pleistoceno de la región Pampeana. Esto confirma la información morfológica y de ADN antiguo que indicaba la presencia de Vicugna vicugna en la Patagonia meridional chilena. Se discuten los resultados en términos taxonómicos, biogeográficos y paleoecológicos sugiriendo que la presencia de este taxón fuera de su rango actual de distribución se debió a las condiciones ambientales compartidas entre la Puna y Patagonia austral durante la transición Pleistoceno-Holoceno. La extinción de V. vicugna se habría debido al impacto de los cambios climáticos ocurridos al inicio del Holoceno producto de su dieta pastadora y etología no migratoria y territorial, a lo que se habría sumado una caza por parte de depredadores humanos y no humanos.Palabras clave: género Vicugna, osteometría, Pleistoceno, Patagonia AbstractThis contribution presents the results of single and multi-variable osteometric analyses performed on a sample of short bones and phalanxes assigned to Vicugna sp. from Lago Sofía Cave 4 site (13500 – 11000 BP, Región de Magallanes, Chile. The elements analyzed show a similar size to the reference collections for Vicugna vicugna, and do not exceed the metrics for the pampean pleistocenic specimens of Vicugna gracilis. This confirms the morphological and ancient DNA data that indicated the presence of vicuña in southern Chilean Patagonia. The taxonomic, biogeographic and palaeoecologic discussion of these results, suggests that the presence of this species outside its current distribution range was due to shared environmental conditions between the Puna and Patagonia during the Pleistocene-Holocene transition. The extinction of this form is, most likely, due to the impact of climatic change during the begining of the Holocene over its pasturing diet and its territorial and non migratory habits. It is added to this, a hunting pressure by human and non-human predators.Keywords: Vicugna genus, osteometry, Pleistocene, Patagonia 

  3. Variabilidad genética y estructura poblacional del tunicado Pyura chilensis Molina, 1782, en la costa de Chile Genetic variability and population structure in tunicate Pyura chilensis Molina, 1782, in the coast of Chile

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    MARCELA P ASTORGA

    2006-12-01

    Full Text Available El tunicado Pyura chilensis se ha considerado una especie de importancia ecológica, por concentrar una gran diversidad biológica en sus agregaciones y de importancia económica por ser un recurso de extracción por pescadores artesanales. Sin embargo, se han detectado cambios en la distribución y abundancia de sus poblaciones adjudicados a su sobreexplotación. Para llegar a establecer medidas de conservación de un recurso, es necesario entre otras cosas, conocer su variabilidad genética y su estructura poblacional, estimando los patrones y sus causas. Por lo tanto, en el presente trabajo se determinó el grado de variabilidad genética aloenzimática del piure P. chilensis y su estructura poblacional en base a tres localidades (Antofagasta, Talcahuano y Puerto Montt en la costa chilena. Los loci polimórficos obtenidos fueron Mdh-1 y Pgi-1. Los valores de Fst mostraron leve estructuración poblacional entre localidades (Fst 0,019 al igual que la prueba exacta de diferenciación genética (P = 0,031. Se observó diferenciación para la localidad de Puerto Montt en relación a las otras dos localidades en algunos de los dos loci. Los niveles de variabilidad observados en esta especie corresponden a lo esperados para otras ascidias. La estructuración genética poblacional puede ser explicada por una combinación de diferentes factores, entre los que destacan: (i el tiempo del periodo larval de 12 a 24 h, lo cual no facilitaría una amplia dispersión a lo largo de 2.500 km de costa y (ii las condiciones oceanográficas diferenciales entre localidades, junto a patrones de circulación cerrados que podrían llegar a restringir el flujo génico. Por último, proponemos que un conocimiento adecuado del grado de variabilidad, estructura y dinámica genética de las poblaciones son aspectos esenciales para tomar medidas de conservación de recursos explotados, tanto en ambientes abiertos como en áreas de manejoThe ascidian Pyura chilensis is an ecologically important species due to its aggregates, providing habitat for other species. In addition, it is an economically important species being commercially exploited along the coast of Chile. Here, changes in distribution and abundance have been observed during the last decade that have been linked to overfishing. Patterns of genetic variation and population structure are important to understand biodiversity, management and conservation of species. Thus, the main objective of this study was to determine the genetic variability and population structure of Pyura chilensis in three localities along the Chilean coast (Antofagasta, Talcahuano, Puerto Montt. The polymorphic loci obtained were: Mdh-1 and Gpi-1 for P. chilensis. The Fst values showed slight population structure (Fst = 0.019, and the genetic differentiation showed statistically significant values (P = 0.031. The Puerto Montt locality was significantly different from the other two sites in the pairwise comparison in some loci. The genetic differentiation among localities of P. chilensis could be explained by a combination of different causes: (i low larval dispersion capacity associated to the larval life time of this species (12 to 24 h, and (ii differences in oceanographic conditions between localities and a closed circulation pattern that restrict dispersion. We conclude that monitoring of genetic diversity levels are essential to establish conservation and management plans of exploited marine resources

  4. VizieR Online Data Catalog: UBVI CCD photometry of Carina region stars (Molina-Lera+, 2016)

    Science.gov (United States)

    Molina-Lera, J. A.; Baume, G.; Gamen, R.; Costa, E.; Carraro, G.

    2016-08-01

    Photometric parameters for 62730 stars in the carina region covering 6 stellar clusters (NGC 3752, Trumpler 18, NGC 3590, Hogg 10, 11 and 12) and the surrounding field. The photometry was secured in March 2006 and March 2009 with the Y4KCAM camera attached to the Cerro Tololo Inter American Observatory (CTIO, Chile) 1.0-m telescope. (1 data file).

  5. Morphological and allozyme variation in a collection of Lagenaria siceraria (Molina Standl. from Côte d'Ivoire

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    Koffi KK.

    2009-01-01

    Full Text Available This study describes the intraspecific variation of 30 edible-seed Lagenaria siceraria germplasm accessions from the University of Abobo-Adjamé. These accessions were collected from three (Centre, East and South geographical zones of Côte d’Ivoire. Selection based on seed size by the farmers has resulted in subdividing the species into two cultivars: large-seeded and smallseeded. The morphological diversity study of the collection included 18 accessions and 24 traits. The multivariate analysis of variance (MANOVA showed a significant difference between the two groups of cultivars. Principal component analysis on 13 traits pointed out variations among individuals, mainly on the basis of flower, fruit, and seed size. Dendrogram with UPGMA method allowed clustering of the cultivars. The genetic structure analysis among accessions using allozyme markers showed the following values: 18.95% for the proportion of polymorphic loci (P, 1.21 for the number of alleles (A and 0.053 for observed heterozygosity (Ho. The level of the within accessions genetic diversity (HS = 0.188 was higher than the genetic variation among accessions (DST = 0.082. The estimates of F-statistics indicated a low level of genetic differentiation between accessions (FST = 0.298. Such a value suggested that L. siceraria maintains about 30% of its genetic variation among accessions. Nei genetic distances between the two cultivars were also low (0.002, indicating that cultivars were genetically similar enough to belong to the same genetic group.

  6. ANALYSIS OF FRUIT POLYMORPHISM IN THE BOTTLE LAGENARIA SICERARIA (MOLINA STANDL. ON THE BASIS OF IMAGES OF ART WORKS

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    Tsatsenko L. V.

    2013-11-01

    Full Text Available The article considers the issues of international spread the fruits of bottled gourd. Analysis of polymorphism of lagenaria fruits have been made on the basis of images of the paintings and sculpture, marked characteristic features of each country. Issues of selection on the basis of the trait of fruit form have considered

  7. La mujer por fuerza, El condenado por desconfiado y El burlador de Sevilla, tres comedias atribuidas a Tirso de Molina

    OpenAIRE

    Rodríguez López-Vázquez,Alfredo

    2010-01-01

    Planteamos tres problemas de atribución de obras autoría dudosa en el teatro del Siglo de Oro: El condenado por desconfiado y La mujer por fuerza, editadas a nombre de Tirso en la problemática Segunda parte, y El burlador de Sevilla, editada a nombre de Tirso en el volumen de Doze comedias de Lope de Vega y otros autores (circa 1630). Aplicamos una metodología de análisis de metáforas y de léxico poco usual, y cotejamos con varias obras de los dos dramaturgos implicados en su atribución, Tirs...

  8. La mujer por fuerza, El condenado por desconfiado and El burlador de Sevilla, Three Comedies Attributed to Tirso de Molina

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    Alfredo Rodríguez López-Vázquez

    2010-03-01

    Full Text Available We expose three attribution problems in several cases of doubtful authorship in the theater of the Siglo de Oro: El condenado por desconfiado and La mujer por fuerza, both edited as Tirso’s works in the problematic Segunda parte and El burlador de Sevilla, edited under the name of Tirso in the volume Doze comedias de Lope de Vega y otros autores (about 1630. We have applied a methodology concerning the analysis of metaphors and inusual lexical items, and we have comparated it with several works by the two dramaturgians concerned by its attributions, Tirso and Claramonte, and also with several others, as reference group. We conclude that La mujer por fuerza is a work by Tirso, El burlador de Sevilla is a Claramonte’s work, and El condenado por desconfiado is also a work by Claramonte, perhaps with a collaboration from Mira de Amescua.

  9. Micromamiferos andinos holocenicos del sitio arqueologico Inca Cueva 5, Ju Juy, Argentina: tafonomia, zoogeografia y reconstruccion paleoambiental

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    Ortiz, P. E.

    2002-08-01

    Full Text Available A micromammal archaeological sequence (2120 f 120 to 780 f 100 years BP from Inca Cueva 5 site (23" 05' S - 65" 27' W; 3700 m.a.s.l., Jujuy Province, Argentina was studied. The following mammalian taxa were recorded: Order Didelphimorphia, Family Didelphidae, Thylamys cf. T. pallidior; Order Rodentia, Family Muridae, Akodon cf. A. albiventer, Andinomys edax, Auliscomys sublimis, Calomys lepidus, Neotomys ebriosus, Phyllotis sp.; Family Caviidae, Cavia cf. C. tschudii, Galea musteloides; Family Abrocomidae, Abrocoma cinerea; Family Chinchillidae, Lagidium viscacia; Family Octodontidae, Octodontomys gliroides. The taphonomy indicates that the sequence is an owl pellet accumulation inside the cave. The general landscape corresponds to the oriental border of the Puna steppe, with scattered shrub and low brush vegetation. Near the site there are small tree groups of Polylepis australis as well as small streams covered with grass and ciperaceous vegetation known as «vegas». Al1 the recorded taxa at Inca Cueva 5 exist today in Puna and Prepuna environments from Jujuy and Salta Provinces and southem Bolivia, excepting Cavia cf. C. tschudii. The modem records of this species in northem Argentina and southern Bolivia come from localities with high montane bunchgrass prairies and forests of the humid Yungas phytogeographical region. The presence of this species in the sequence suggests wetter climatic conditions on this region when the archaeological site was originated. Later drier conditions, caused probably by anthropic influence in the last 500 years, produced the retraction of Cavia tschudii to the moist eastern side of the Andes and its disappeareance of the Puna areas.El sitio arqueológico Inca Cueva 5 se encuentra en la provincia de Jujuy, Argentina, en el borde oriental de la región de la Puna (23" 05' S - 65" 27' W; 3700 m s n m y está fechado entre 2120 f 120 y 780 f 100 años radiocarbónicos AP. El estudio de una pequeña muestra de

  10. Comportamentos e atividade diária de Sciurus ingrami (Thomas em cativeiro (Rodentia, Sciuridae Behaviour and diary activity of Sciurus ingrami (Thomas in captivity (Rodentia, Sciuridae

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    Marcelo Bordignon

    1997-09-01

    Full Text Available From October 1994 to November 1995 the behaviour, postures and diurnal activity of tive captive squirrels Sciurus ingrami were observed and registered. Four basics postures, five grooming behaviours, displacements and face wiping behaviour were identified. Based on behavioural observations, the diurnal activity was divided into four categories: resting, displacement, teeding and maintenance. The time spent in each category varied seasonally and the squirrels spent more time resting during winter and spring. However, more time was spent feeding during autum and summer and was reduced the displacement in autum. Two types of breeding behaviour were identified: sexual trailing and mating chase of females by males. However copulatori behaviour was not recorded during the studied period. We also verified that S. ingrami presents thermorregulation behaviour during winter, remaining resting in the nest to conserve energy in heath maintenance. During the hottest seasons, the squirrels remain resting out of the nest, placed on the branchs to decrease their body heat to normal temperature, The behaviours observed in this study were similar to those described in the literature, as well as the mating behaviour, which was very similar to S. carolinensis.

  11. VARIACIÓN CARIOLÓGICA EN DIFERENTES FENOTIPOS DE Sciurus granatensis (RODENTIA, SCIURIDAE Karyologic Variation in Different Phenotypes of Sciurus granatensis (Rodentia, Sciuridae

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    CAROLINA ARANGO

    Full Text Available Siete ejemplares de Sciurus granatensis (ardilla colombiana de diferentes fenotipos según color, rescatadas del tráfico ilegal de fauna silvestre de Colombia fueron estudiadas. Mediante técnicas convencionales de bandeo cromosómico G, C, Q, R y NOR se estableció su cariotipo 2n=42. Se encontraron tres cariomorfos de acuerdo al Número Fundamental (NF y características propias de cada uno de los complementos ocasionadas por distintos rearreglos cromosómicos, lo cual sugiere que S. granatensis es un complejo de especies. No se observó relación entre cariotipo y fenotipo. La variación en el color del pelaje se debe probablemente a las condiciones ambientales.Seven specimens of Sciurus granatensis (redtailed squirrel rescued from illegal fauna traffic in Colombia were studied; they had different phenotypes according to colour. G, C, Q, R and NOR chromosome banding was used, being found a 2n=42 diploid number for the Sciurus granatensis Colombian squirrels. There were 3 karyomorphs according to fundamental number (FN and different chromosomal characteristics caused by rearregement, suggesting that S. granatensis represents a complex of species. Relationships between karyotype and phenotype were not observed. The variation in the colour of sqirrels’ fur was probably due to environmental conditions.

  12. Variación cariológica en diferentes fenotipos de Sciurus granatensis (Rodentia, Sciuridae Karyologic Variation in Different Phenotypes of Sciurus granatensis (Rodentia, Sciuridae

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    Chacón Marcos Nicolás

    2007-12-01

    Full Text Available Siete ejemplares de Sciurus granatensis (ardilla colombiana de diferentes fenotipos según color, rescatadas del tráfico ilegal de fauna silvestre de Colombia fueron estudiadas. Mediante técnicas convencionales de bandeo cromosómico G, C, Q, R y NOR se estableció su cariotipo 2n=42. Se encontraron tres cariomorfos de acuerdo al Número Fundamental (NF y características propias de cada uno de los complementos ocasionadas por distintos rearreglos cromosómicos, lo cual sugiere que S. granatensis es un complejo de especies. No se observó relación entre cariotipo y fenotipo. La variación en el color del pelaje se debe probablemente a las condiciones ambientales.Seven specimens of Sciurus granatensis (redtailed squirrel rescued from illegal fauna traffic in Colombia were studied; they had different phenotypes according to colour. G, C, Q, R and NOR chromosome banding was used, being found a 2n=42 diploid number for the Sciurus granatensis Colombian squirrels. There were 3 karyomorphs according to fundamental number (FN and different chromosomal characteristics caused by rearregement, suggesting that S. granatensis represents a complex of species. Relationships between karyotype and phenotype were not observed. The variation in the colour of sqirrels' fur was probably due to environmental conditions.

  13. Registro nuevo de Neotoma mexicana vulcani (Rodentia: Muridae para México A new record of Neotoma mexicana vulcani (Rodentia: Muridae in Mexico

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    Roberto Vidal-López

    2005-12-01

    Full Text Available Se registra la presencia de Neotoma mexicana vulcani en México, subespecie antes considerada como endémica del volcán Tajomulco, Departamento de San Marcos, Guatemala. La identificación se llevó a cabo con base en la revisión de las medidas morfométricas y patrones de coloración de ejemplares recientemente recolectados y registros de bases de datos. Con estos resultados, el área de distribución de la subespecie se amplía hacia México en la Sierra Madre de Chiapas, aproximadamente a 50 km al norte de la localidad anteriormente conocida.We report the presence of Neotoma mexicana vulcani in Mexico; this subspecies has been considered endemic to the Tajomulco volcano, in the Departamento of San Marcos, Guatemala. We identified our specimens using measurements, color patterns of recently colleted specimens, and data base records. Based on our results, the distribution range of this subspecies extends to Mexico, in the Sierra Madre of Chiapas, approximately 50 km north of the previously known locality.

  14. Obsessed with grasses?: The case of mara Dolichotis patagonum(Caviidae: Rodentia ¿Obsesionada con gramíneas?: El caso de mara Dolichotis patagonum (Caviidae: Rodentia

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    MOIRA S. SOMBRA

    2005-09-01

    Full Text Available The diet of mara (Dolichotis patagonum, Zimmeraman 1780 within the limits of Sierra de las Quijadas National Park (San Luis, Argentina is described. Other studies regarding mara’s diet showed that mara, feeds on different species of grasses and shrubs. However, there is controversy regarding the proportions of these items in the diet or whether this proportion varies seasonally. Considering mara’s body size, anatomical features and physiology, we suggest that mara feeds on grasses in a greater proportion than shrubs and forbs. Moreover, giving that in this region precipitation varies considerably between seasons; it is also expected to find a correlation between the diet of mara and seasons. Fecal pellets of mara were collected during four periods including two dry, and two wet seasons. Relative frequency of each item in scats was determined by microhistological analysis. Results support the hypothesis that mara shows preference for grasses, despite they are less available than shrubs and forbs and that this preference remains constant through seasons regardless of the precipitation regime. The characteristics of mara’s diet and the ecological implications of these findings are discussedEn este trabajo se describe la dieta de mara (Dolichotis patagonum Zimmeraman 1780 en el Parque Nacional Sierra de las Quijadas (San Luis, Argentina. Los estudios realizados sobre su dieta indican que se alimenta de varias especies de gramíneas y arbustos. Sin embargo, existe cierta controversia acerca de la proporción en que se presentan estos ítemes, y si las mismas varían estacionalmente. En base al tamaño corporal de mara, y a sus características anatómicas y fisiológicas se propone que, mara consume una mayor proporción de gramíneas que de otras hierbas no graminiformes y dicotiledóneas en general. Además esperamos una variación estacional de la dieta, correlacionada a una posible variación estacional en los recursos alimentarios asociada a las precipitaciones. Se colectaron muestras de heces correspondientes a cuatro estaciones en el parque, dos estaciones secas y dos lluviosas. Mediante análisis microhistológico se determinó la proporción de cada ítem medido como frecuencia de aparición en las heces. Los resultados apoyan la hipótesis de un consumo preferencial de gramíneas por parte de mara. Las gramíneas aparecen en mayor proporción en la dieta a pesar de estar en menor disponibilidad en el hábitat y sin que el régimen de precipitación tenga algún efecto Se discuten las características de la dieta de mara y las implicancias ecológicas relacionadas con esta especie

  15. Records of Coendou ichillus (Rodentia, Erethizontidae) from the Lower Urubamba Region of Peru

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    Gregory, Tremaine; Lunde, Darrin; Zamora-Meza, Hugo Tomás; Carrasco-Rueda, Farah

    2015-01-01

    Abstract Coendou ichillus was first described in 2001 by Voss and da Silva, with a range from Amazonian Ecuador to Iquitos, Peru. Here, we describe an adult female Coendou ichillus specimen collected in a Tomahawk trap in the forest canopy of the Lower Urubamba Region of Peru in October 2013. We also describe pathologies and behaviors observed through 379 camera trapping photo events (2,196 photos) gathered in natural canopy bridges over the course of a year (7,198 trap nights), including information on activity period over the course of the day and over the course of the lunar cycle. We conservatively estimate that 17 individuals were photographed, including one juvenile. Being 900 km away from Iquitos, Peru (the site of the closest record), discovery of this species in the Lower Urubamba constitutes a significant range extension. PMID:26175605

  16. Dinomys branickii Peters, 1873 (Rodentia, Dinomyidae: consumption and food preference in captivity

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    Raymundo Tomaz Melo dos Santos Neto

    2017-02-01

    Full Text Available Dinomys branickii is a large rodent listed as Endangered (EN, that suffers pressure from anthropogenic activities such as hunting and habitat destruction. Captive breeding methods are viable for supplementation of conservation projects, and may enhance our knowledge of main aspects of the biology of this species. The objective of this study was to determine consumption and food preferences in a captive group of D. branickii. To determine feeding preferences, the Food Preference Index (P was used for the type of food with highest consumption. The mean amount of food provided was 6.6 kg per day per group, with 4.4 kg per day/group consumed (66%. An average of 11 ± 2.9 types of food were offered daily. The consumption of fruits (71% was higher than the consumption of other food groups, followed by roots/tubers (65.3%. The food groups least consumed were cereals and seeds (39.4% and leaves (38.3%. The preferred foods were: Brassica oleracea (P = 1.38, Zea mays (P = 1.25, Ipomoea batatas (P = 1.17, Mangifera indica (P = 1.13, Cucurbita moschata (P = 1.10, Talinum esculentum (P = 1.00 and Manihot esculenta (P = 1.00. These results suggest that foods with high fiber and carbohydrate content are the best choices for D. branickii development and well-being in captivity.

  17. Age Variations in Microtus guentheri Danford and Alston, 1880 (Mammalia: Rodentia) in Turkey

    OpenAIRE

    SÖZEN, Mustafa; ÇOLAK, Ercüment; Nuri YİĞİT

    1999-01-01

    The skull, teeth, phallus and bacula of Microtus guentheri specimens raised in the laboratory were investigated at different stages of postnatal development. The most of the cranial measurements attained those of adults on day 60. There were determined to be some morphological differences between the skulls of young and adult voles. The incisors and the molars began to erupt at 3 and 6 days, respectively. It was shown that there was no difference in respect to the phallic and bacular morpholo...

  18. Studies on Rift Valley fever in some African murids (Rodentia: Muridae).

    Science.gov (United States)

    Swanepoel, R; Blackburn, N K; Efstratiou, S; Condy, J B

    1978-04-01

    Brains, spleens and livers of 2214 murids, 27 shrews and 7 dormice, trapped at 7 sites in Rhodesia, were tested in 277 pools for the presence of Rift Valley Fever virus. There were no isolations of Rift Valley Fever, but 69 isolations of an unidentified virus were obtained. Sixteen out of 867 sera had low-titre haemagglutination-inhibition activity against Rift Valley Fever antigen, but only one out of 1260 sera had neutralizing antibody. The evidence suggests that murids fail to encounter infection in nature and are unlikely to play a role in circulation and dissemination of Rift Valley Fever virus. Four out of seven widely distributed species of muried, Rhabdomys pumilio, Saccostomys campestris, Aethomys chrysophilus and Lemniscomys griselda, were shown to be capable of circulating amounts of virus likely to be infective for mosquitoes.

  19. Chromosomal and molecular characterization of Aethomys kaiseri from Zambia and Aethomys chrysophilus from Tanzania (Rodentia, Muridae).

    Science.gov (United States)

    Castiglia, Riccardo; Corti, Marco; Colangelo, Paolo; Annesi, Flavia; Capanna, Ernesto; Verheyen, Walter; Sichilima, Alfred Matafwali; Makundi, Rhodes

    2003-01-01

    Aethomys is a common and widespread rodent genus in the African savannas and grasslands. However, its systematics and taxonomy are still unclear as no study has covered the entire range. In fact it might not be a monophyletic genus and perhaps should be split into two subgenera, Micaelamys and Aethomys. In this paper, we present findings based on the cytogenetics and the entire cytochrome b sequence of two species from Zambia (A. kaiseri) and Tanzania (A. chrysophilus), and we compare them with the sequences of a South African species (A. namaquensis) and other allied muroid genera. Comparison of the banded chromosomes revealed complete G-band homology between the autosomes of the two species. However, the X and Y chromosomes clearly differ in size and in C- and G-banding, being much larger in A. kaiseri. Comparison of the cytochrome b sequences places the separation between A. kaiseri and A. chrysophilus at 4.49 Mya, a period of intense speciation in other African muroids. The resulting phylogeny strongly supports the idea of a paraphyletic group, suggesting the need to elevate the previously described subgenera to the genus rank.

  20. New record on Pigmy Field Mouse (muridae, rodentia from northeast Iran

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    Jamshid Darvish

    2011-02-01

    Full Text Available

    Abstract
    In this study the field mice of eastern Elborz in Golestan province were examined using molecular, morphologic and morphometric characters. RFLP analysis indicates the presence of three different haplotypes called as A, B and C. Taxonomic determination of the specimens of the haplotyes shows that haplotypes A, B and C represents three different species, A. cf. uralensis, A. cf. hyrcanicus and A. witherbeyi, respectively. Two latter species were previously reported from the studied area. However, the discovery of A. cf. uralensis in this region extends the eastern border of the distribution of this species up to eastern Elbruz and confirms the sympatric occurrence of A. uralensis and A. hyrcanicus in the Golestan province. 

  1. A new form of rodent placentation in the relict species, Laonastes aenigmamus (Rodentia Diatomyidae)

    DEFF Research Database (Denmark)

    Carter, Anthony Michael; Enders, A C; Jones, C J P

    2013-01-01

    . METHODS: We examined the reproductive tract of nonpregnant (n = 5), early (n = 3) and mid to late gestation (n = 2) females. Selected characters were mapped to a phylogenetic tree to examine their evolution in rodents. RESULTS: The chorionic placenta was discoid and labyrinthine with a spongy zone...... but without internal lobes. The interhemal region was hemodichorial with syncytiotrophoblast lining maternal blood spaces and an inner layer of vacuolated cytotrophoblast. There was no subplacenta. The yolk sac was well developed with a villous portion that faced the placental disk but no fibrovascular ring....... There was a single fetus that very likely would be precocial at birth. DISCUSSION: A lobulated labyrinth and the presence of a subplacenta and a fibrovascular ring emerged as synapomorphies for Hystricognathi. Laonastes, Ctenodactylus and stem Hystricognathi all had precocial young, whereas altriciality...

  2. Effects of classical music as part of environmental enrichment in captive Mus musculus (Rodentia: Muridae

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    José Geraldo Pereira da Cruz

    2010-06-01

    Full Text Available In the wild, animals are exposed to an ever-changing array of sensory stimuli. The captive environment, by contrast, is generally much more impoverished in terms of the cues it offers the animals housed within. In a bid to remedy this, and promote better welfare, mice (Mus musculus were exposed to two conditions: no auditory stimulation, and stimulation with classical music. In all experiments, a battery of behavior tests was used. The results demonstrated significantly decreased immobility in the forced swim, increased enclosed arm entries in the plus-maze, and decreased immobility in the open-field, in animals that had been pre-exposed to music 24h earlier, suggesting that changes in mouse motor activity were caused by classical music. This study led to the conclusion that environmental enrichment may have profound effects on the behavior of mice in behavioral tests, and that classical music can be a relatively simple method of contributing to the well-being of captive mice, but it can affect the results of experiments such as forced swimming.

  3. A new karyotype of Wiedomys pyrrhorhinus (Rodentia: Sigmodontinae from Chapada Diamantina, northeastern Brazil

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    Ana L. G Souza

    2011-02-01

    Full Text Available A new karyotype of Wiedomys pyrrhorhinus (Wied, 1821 is described, including G- and C-banding and Ag-NOR sites from specimens collected in the municipality of Morro do Chapéu, situated in the northern region of the Chapada Diamantina, state of Bahia. Karyological studies of W. pyrrhorhinus have shown a constant diploid number (2n of 62 with two different numbers of autosomal arms (FNa: 86 and 90, respectively. The new karyotype revealed 2n = 62 and FNa = 104, being the higher autosomal number found so far for this genus. The X chromosome is a large acrocentric and the Y chromosome is a small acrocentric. The analysis of the karyotype morphology suggests that this new karyotype is more closely related to the previous karyotype with 2n = 62 and FNa = 90, described from Caetité, Bahia State. Further studies, comparing different populations of W. pyrrhorhinus, including molecular approaches, may help to better understand the geographical limits of each population and their phylogenetic relationships in the Caatinga biome

  4. Revision of bank vole Clethrionomys glareolus (Schreber, 1780 (Mammalia, Rodentia distribution in Serbia and Montenegro

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    Paunović M.

    2005-01-01

    Full Text Available The present article represents a complete review of all published data (with corrections on bank vole Clethrionomys glareolus distribution in Serbia and Montenegro. On the other hand, data of 63 unpublished records stored in the period from 1956 to 1983 in the Mammal Study Collection of the Natural History Museum, Belgrade had not been processed until now. In the period from 1992 to 2004, 29 new findings were recorded, 12 of them outside the currently known area of distribution. New data reveal a wider distribution of bank vole than was known until now, completing and partly modifying previous knowledge about this rodent's bionomy and ecology in Serbia and Montenegro. The occurrence of bank vole in the Prokletije Mountains, Kosovo and Metohija represents its highest known altitude in Europe (2500 m. On the basis of these new data and observations, we can conclude that bank vole is continuously present in small and linear fragments of autochthonous woodlands on plains and hills, and that there are no large discontinuities in its distribution in Serbia and Montenegro, as was assumed earlier. In efforts to preserve overall biological diversity, the example of the bank vole underlines the need to intensify protection and management of woodlands especially remaining fragments of forests on plains and in hills.

  5. Variación cariológica en diferentes fenotipos de Sciurus granatensis (Rodentia, Sciuridae

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    Bueno Angulo Marta Lucía

    2007-04-01

    Full Text Available Debido a la poca información ecológica, taxonómica o genética sobre las ardillas colombianas, existen problemas
    sistemáticos aun no resueltos (Emmons LH, 1990, lo cual dificulta la reubicación y/o liberación de ejemplares sin procedencia, provenientes del tráfico ilegal de fauna silvestre. Estudios cariológicos sirven para detectar variaciones intra e interespecíficas por lo que en este trabajo se busco detectar diferencias cariotípicas entre varios fenotipos Sciurus granatensis. La diferenciación genética en conservación, puede ser una herramienta
    útil en la toma de decisiones en los procesos de liberación de ejemplares capturados, dado que la introducción
    de individuos con genomas diferentes en un población puede originar un proceso de depresión por exogamia o introgresión genética (pérdida de alelos adaptativos locales, procesos nocivos para la población receptora. Se estudiaron siete especímenes (cinco hembras y dos machos de S. granatensis procedentes del tráfico ilegal. Los cariotipos fueron obtenidos a partir de cultivos de linfocitos de sangre periférica. Las metafases con bandas G, R, C, Q y NOR, se analizaron al microscopio y se ordenaron en el programa Lucia Karyotyping®. Los individuos estudiados corresponden a los tres fenotipos reportados por Emmons LH, 1990, pero con una gran variación cariológica. Solo uno de los machos no corresponde a los fenotipos descritos, y además presenta varios rearreglos cromosómicos que lo diferencian notablemente de los demás, por lo cual posiblemente se trate de un híbrido estéril originado de dos poblaciones diferenciadas cariológicamente. El número de cromosomas fue constante (2n=42, con variación en el número fundamental (NF=80; 81, por lo cual se reportan tres cariomorfos para Sciurus granatensis, según NF y los rearreglos cromosómicos encontrados. Se observó variación en los pares 9, 16 y una translocación universal entre autosomas dentro de uno de los ejemplares. El cromosoma X es submetacéntrico mediano. El cromosoma Y es acrocéntrico, coincidente con lo descrito para Sciurus. No se registró una relación cariotipo-fenotipo. Por lo tanto se puede sugerir que Sciurus granatensis, es un complejo de especies con diferencias cariológicas y morfológicas que no ha sido estudiado a profundidad teniendo en cuenta su amplia distribución geográfica.

  6. Fatal placental subinvolution in a captive capybara (Hydrochaeris hydrochaeris, Order Rodentia).

    Science.gov (United States)

    Juan-Sallés, C; Martínez, L S; Garner, M M

    2005-07-01

    An adult, captive-born female capybara died of systemic thrombosis and hemoperitoneum associated with placental subinvolution. Grossly, the uterus was enlarged, segmentally thickened, and associated with a large blood clot in the abdominal cavity. There was hemometra and a large ovoid mass in each uterine horn weakly adhered to the endometrium, and the right uterine horn wall had a small perforation over the mass. The mesometrial veins were markedly dilated due to thrombosis and occasionally perforated. Histologically, the uterine masses consisted of partly necrotic placental and subplacental tissue. The uterine wall surrounding the masses had full-thickness coagulative necrosis of the myometrium and diffuse endometrial ulceration with abundant syncytiotrophoblast-like cells within capillaries. Vascular lesions in the uterus and mesometrium consisted of mural invasion by cytotrophoblast and syncytiotrophoblast-like cells, thrombosis, fibrinoid necrosis, and/or heterophilic vasculitis. This is the first report of placental subinvolution in capybaras or any rodent species, to the authors' knowledge.

  7. Seasonal changes in burrow geometry of the common mole rat (Rodentia: Bathyergidae)

    Science.gov (United States)

    Thomas, H. G.; Scantlebury, M.; Swanepoel, D.; Bateman, P. W.; Bennett, N. C.

    2013-11-01

    Sociality in mole rats has been suggested to have evolved as a response to the widely dispersed food resources and the limited burrowing opportunities that result from sporadic rainfall events. In the most arid regions, individual foraging efficiency is reduced, and energetic constraints increase. In this study, we investigate seasonal differences in burrow architecture of the social Cryptomys hottentotus hottentotus in a mesic region. We describe burrow geometry in response to seasonal weather conditions for two seasons (wet and dry). Interactions occurred between seasons and colony size for the size of the burrow systems, but not the shape of the burrow systems. The fractal dimension values of the burrow systems did not differ between seasons. Thus, the burrow complexity was dependent upon the number of mole rats present in the social group.

  8. The role of the water voles (Arvicola, Rodentia in the Quatemary

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    Ruiz Bustos, A.

    1999-04-01

    Full Text Available Arvicolids are rodents which have molars with a morphology formed by a sequence of enamel folds similar to the curve y = sin f(x. The morphology of the crown of the first lower molar (mi of living species of Arvicola (large voles is identified with six criteria, irrespective of tooth size. When rootless arvicolid fossil communities are analysed, it can be seen that the mi morphology of Arvicola is present in those communities represented by specimens of small size at the beginning of the Quaternary. Before this data was known, the presence of Arvicola communities could only be detected in the second half of the Quaternary, when the specimens were comparable to the large size characterising living species. The existence of communities of small-sized Arvicola at the beginning of the Quaternary implies that the mi of Arvicola undergoes a continuous and accelerated growth throughout the entire Quatemary, which allows representatives the genus to be used as a chronological tool. These data mean that it is necessary to change the concept of the genus Allophaiomys and to formulate a new classification to reflect evolutionary relationships of quatemary arvicolids.Los arvicólidos son roedores que tienen la morfología de la corona de los dientes formada por una secuencia de pliegues de esmalte que se asemeja a la curva y=sen f(x. Las especies actuales del género Arvicola cumplen en la morfología del molar mI, seis criterios que son independientes de la talla. El examen de las poblaciones de arvicólidos sin raíz, procedentes del Pleistoceno inferior, indica la existencia de molares con una morfología idéntica a la de los ejemplares vivos de Arvicola, pero con menor talla. La existencia de esta identidad permite proponer la hipótesis de poblaciones primitivas del género Arvicola con pequeña talla durante el Pleistoceno Inferior. Estas han pasado desapercibidas entre las poblaciones de Allophaiomys. a causa de su identidad morfológica entre ambos. La hipótesis de la existencia de Arvicola en el Pleistoceno Inferior supone un profundo cambio en el concepto de Allophaiomys como género y convierte la talla de Arvicola, por su continuo crecimiento durante todo el Pleistoceno, en un útil instrumento cronológico.

  9. Morphology of the tongue and characteristics of lingual papillae in Cuniculus paca (Rodentia: Cuniculidae

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    André Luiz Quagliatto Santos

    2013-11-01

    Full Text Available This paper describes the morphology of the tongue, its extrinsic muscles, and the characteristics of lingual papillae in Cuniculus paca. We used fifteen specimens from the Wild Animals Sector of Universidade Estadual Paulista (UNESP. In this species, the tongue is divided into three regions: root, body, and apex. The latter is delimited by the lingual frenum, which has the aspect of fibrous membrane. We also identified a median groove and a prominence on its dorsal surface. The extrinsic tongue muscles are the styloglossus, hyoglossus, genioglossus, geniohyoid, and milohyoid, the latter two are inserted into the hyoid apparatus. As for the presence of lingual papillae, we observed five papillae types in all specimens: filiform, fungiform, vallate, foliate, and conic. The filiform papillae are distributed throughout the apex surface and tongue body. They are caudally inclined throughout the body, until they are modified in the root region and form the conic papillae. The fungiform papillae are distributed in a large amount on the lingual apex, between the filiform papillae. This papilla type has a mushroom-like shape. Only two vallate papillae are located in the caudal portion of the lingual root, and they have an oval shape and are surrounded by a deep groove. The foliate papillae are observed in parallel grooves or slots located in the lateral portion of the tongue, between the vallate papillae and half of the intermolar prominence. In the tongue root, body, and apex we observed keratinized squamous stratified epithelium lining both the lingual papillae and the surface between them.

  10. Species composition and conservation of small mammals (Mammalia: Erinaceomorpha, Soricomorpha, Lagomorpha, Rodentia in Vrachanska Planina Mountains

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    NEDKO NEDYALKOV

    2016-05-01

    Full Text Available A review on the composition of the small mammals in Vrachanska Planina Mts. was completed using published and author’s data. A total of 27 species occur within the territory. All of the species found are typical for the region. The species with the highest conservation status, the European ground squirrel Spermophilus citellus, disappeared from the region in the early 1950s. In the last years activities on its recovery were carried out. We analyze the threats for the small mammals and propose conservation activities to improve their conservation status.

  11. The comparative gastrointestinal morphology of Jaculus jaculus (Rodentia) and Paraechinus aethiopicus (Erinaceomorpha).

    Science.gov (United States)

    Pereira, Daniella L; Walters, Jacklynn; Bennett, Nigel C; Alagaili, Abdulaziz N; Mohammed, Osama B; Kotzé, Sanet H

    2016-05-01

    Jaculus jaculus (Lesser Egyptian jerboa) and Paraechinus aethiopicus (Desert hedgehog) are small mammals which thrive in desert conditions and are found, among others, in the Arabian Peninsula. Jaculus jaculus is omnivorous while P. aethiopicus is described as being insectivorous. The study aims to describe the gastrointestinal tract (GIT) morphology of these animals which differ in diet and phylogeny. The GITs of J. jaculus (n = 8) and P. aethiopicus (n = 7) were weighed, photographed, and the length, basal surface areas, and luminal surface areas of each of the anatomically distinct gastrointestinal segments were determined. The internal aspects of each area were examined and photographed while representative histological sections of each area were processed to wax and stained using haematoxylin and eosin. Both species had a simple unilocular stomach which was confirmed as wholly glandular on histology sections. Paraechinus aethiopicus had a relatively simple GIT which lacked a caecum. The caecum of J. jaculus was elongated, terminating in a narrow cecal appendix which contained lymphoid tissue on histological examination. The internal aspect of the proximal colon of J. jaculus revealed distinct V-shaped folds. Stomach content analysis of J. jaculus revealed mostly plant and seed material and some insects, whereas P. aethiopicus samples showed plant material in addition to insects, indicating omnivorous feeding tendencies in areas where insects may be scarce.

  12. Chromosomal and C-heterochromatin Characterization of Arvicanthis niloticus (Rodentia: Murinae in Egypt

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    Mahmoud I. Shoulkamy

    2006-01-01

    Full Text Available The karyotype and C-banding pattern of the unstriped grass rat Arvicanthis niloticus from four localities in Egypt are presented. All individuals karyotyped, as a rule, have the same diploid number of 2n = 62 and autosomal Fundamental Number of aFN = 62. In addition, all chromosomes have a large centromeric block of fairly uniform size. However, an additional interstitial or telomeric small C-band is scored in some chromosomes. Nevertheless, frequent heteromorphism in the morphology and heterochromatin content of both the homologous chromosomes of the pair No. 1 and the X chromosome are scored in some individuals from the four localities and led to an aFN = 63. Accordingly, four forms or cytotypes, namely ANI-1a, ANI-1b, ANI-1c and ANI-1d, are recognized based on this variation, which is mostly attributed either to addition or deletion of a heterochromatic segment as a result of pericentric inversions. Of these four forms, the ANI-1a is considered ancestral for A. niloticus in Egypt and is closely similar to that of the Ethiopian A. dembeensis, regardless the contradiction concerned with nomenclature of the X chromosome, while the karyotypes of the other forms are synapomorphy of the form ANI-1a and showed as well a relative resemblance to those of the Ethiopian A. abyssinicus and A. blicki. Therefore, it is concluded that the genus Arvicanthis would be represented by an Egyptian-Ethiopian radiation (A. niloticus, A. dembeensis, A. abyssinicus and A. blicki and by a Central-Western African one, including the karyotypes described as A. centralis and A. solatus. Moreover, A. niloticus should be regarded no longer as a single species but as a cluster of several proper species.

  13. Bony labyrinth morphometry indicates locomotor adaptations in the squirrel-related clade (Rodentia, Mammalia)

    OpenAIRE

    2015-01-01

    The semicircular canals (SCs) of the inner ear detect angular acceleration and are located in the bony labyrinth of the petrosal bone. Based on high-resolution computed tomography, we created a size-independent database of the bony labyrinth of 50 mammalian species especially rodents of the squirrel-related clade comprising taxa with fossorial, arboreal and gliding adaptations. Our sampling also includes gliding marsupials, actively flying bats, the arboreal tree shrew and subterranean specie...

  14. Bony labyrinth morphometry indicates locomotor adaptations in the squirrel-related clade (Rodentia, Mammalia).

    Science.gov (United States)

    Pfaff, Cathrin; Martin, Thomas; Ruf, Irina

    2015-06-22

    The semicircular canals (SCs) of the inner ear detect angular acceleration and are located in the bony labyrinth of the petrosal bone. Based on high-resolution computed tomography, we created a size-independent database of the bony labyrinth of 50 mammalian species especially rodents of the squirrel-related clade comprising taxa with fossorial, arboreal and gliding adaptations. Our sampling also includes gliding marsupials, actively flying bats, the arboreal tree shrew and subterranean species. The morphometric anatomy of the SCs was correlated to the locomotion mode. Even if the phylogenetic signal cannot entirely be excluded, the main significance for functional morphological studies has been found in the diameter of the SCs, whereas the radius of curvature is of minor interest. Additionally, we found clear differences in the bias angle of the canals between subterranean and gliding taxa, but also between sciurids and glirids. The sensitivity of the inner ear correlates with the locomotion mode, with a higher sensitivity of the SCs in fossorial species than in flying taxa. We conclude that the inner ear of flying and gliding mammals is less sensitive due to the large information flow into this sense organ during locomotion.

  15. Intrageneric phylogeny of Acomys (rodentia, muridae) using mitochondrial gene cytochrome b.

    Science.gov (United States)

    Barome, P O; Monnerot, M; Gautun, J C

    1998-06-01

    This paper investigates interspecies relationships within the genus Acomys (spiny mice) by analyzing entire mitochondrial cytochrome b gene (1141 bp). This gene provides strong phylogenetic signal, as shown by high support of the topology obtained (bootstrap value and RNA support number). The phylogeny is congruent with inferences from allozymes for the species considered. Controversial taxonomy of Acomys cahirinus, dimidiatus, airensis, and ignitus is clarified, with their specific ranks confirmed on the basis of tree topology and nucleotide distances. Phylogenetic relationship between the undescribed species Acomys sp. from west Africa and A. airensis argue in favor of two distinct colonization events in this zone.

  16. Reproductive biology of Acomys cilicicus Spitzenberger, 1978 (Rodentia: Muridae) in Turkey

    OpenAIRE

    KIVANÇ, Erkut; EYİSON, Hatice MUTLU; KIRALP, Seda; EKİM, Okan

    2014-01-01

    The genus Acomys is represented by 19 species in a vast area in the African and eastern Mediterranean regions. Acomys cilicicus, belonging to the genus Acomys, is an endemic species in Turkey. In this study, by evaluating the reproductive data in laboratory conditions and the natural habitat of A. cilicicus, the reproductive biology of the species was researched in detail for the first time. The data concerning the reproduction of 1404 samples, reproduced from 1 male and 2 females in the labo...

  17. The origin of an unusual sex chromosome constitution in Acomys sp. (Rodentia, Muridae) from Tanzania.

    Science.gov (United States)

    Castiglia, Riccardo; Makundi, Rhodes; Corti, Marco

    2007-10-01

    This paper describes a case which presents an evident variation from the "standard" XX/XY sex chromosomal constitution in a rodent, Acomys sp. This species known to be found in three localities of East Africa has only recently been separated from A. spinosissimus, its closest relative. In our study, five specimens of Acomys sp. and eight specimens of A. spinosissimus were live-trapped in five localities. Comparisons between the two taxa assed by G-banding show a complete homology in the chromosomal shape and banding pattern for 29 pairs of chromosomes corresponding to the complete autosomal set of A. spinosissimus. However, while all the A. spinosissimus analysed have 2n = 60 and a XY-XX system, in Acomys sp. males and females constitute mosaics for sex chromosomes in the bone marrow cells. Females (2n = 59, 60) have an excess (97%) of aneuploid cells with one single giant X chromosome, and males (2n = 60, 61) show X0/XY cells occurring in somatic tissues and XY cells in the germinal lineage. In addition, an odd heterochromatic submetacentric chromosome was identified in all the cells examined in two males and a female of Acomys sp. Since this chromosome was not related to sex determination and it is not present in all the analysed specimens, it can be considered as a B chromosome. Finally, the in situ fluorescence hybridisation (FISH) with telomeric probes showed a very intense interstitial telomeric signal (ITS) at the medial part on the long heterochromatic arm of the X chromosome. This could be due to recent chromosomal rearrangement.

  18. Rattus norvegicus (Rodentia: Muridae) Infected by Leishmania (Leishmania) infantum (syn. Le. chagasi) in Brazil.

    Science.gov (United States)

    Lara-Silva, Fabiana de Oliveira; Barata, Ricardo Andrade; Michalsky, Erika Monteiro; Ferreira, Eduardo de Castro; Lopes, Maria Olímpia Garcia; Pinheiro, Aimara da Costa; Fortes-Dias, Consuelo Latorre; Dias, Edelberto Santos

    2014-01-01

    In the present study we surveyed the fauna of phlebotomine sand flies and small mammals in peridomestic areas from a Brazilian municipality where the American cutaneous leishmaniasis (ACL) is endemic. A total of 608 female phlebotomine sand flies were captured during nine months in 2009 and 2010. Seven different species were represented with 60% of them being Lutzomyia intermedia and Lu. whitmani, both incriminated vectors of ACL. Lu. longipalpis, a proven vector of visceral leishmaniasis (VL) was also captured at high proportion (12.8%). Genomic DNA analysis of 136 species-specific pools of female sand flies followed by molecular genotyping showed the presence of Leishmania infantum DNA in two pools of Lu. longipalpis. The same Leishmania species was found in one blood sample from Rattus norvegicus among 119 blood and tissue samples analysed. This is the first report of Le. infantum in R. norvegicus in the Americas and suggests a possible role for this rodent species in the zoonotic cycle of VL. Our study coincided with the reemergence of VL in Governador Valadares.

  19. Progonomys Schaub, 1938 and Huerzelerimys gen. nov. (Rodentia) : their evolution in Western Europe

    NARCIS (Netherlands)

    Mein, P.; Martín Suárez, E.; Agustí, J.

    1993-01-01

    In this paper the various species and populations attributed to the genus Progonomys Schaub, 1938 are revised. Valerymys Michaux, 1969 is considered to be synonymous with Occitanomys Michaux, 1969, since the type-species V. ellenbergeri (Thaler, 1966) was included in Occitanomys by Aguilar et al. (1

  20. A new species of Sciurodendrium (Nematoda: Heligmonellidae) in Sciurus aureogaster (Rodentia: Sciuridae) from Morelos, Mexico.

    Science.gov (United States)

    Falcón-Ordaz, Jorge; Lamothe-Argumedo, Marcos Rafael

    2006-06-01

    Sciurodendrium bravohollisae n. sp. (Heligmonellidae) is described as an intestinal parasite of 2 squirrels, Sciurus aureogaster Cuvier, 1829, collected from Los Robles, Municipio de Tlalnepantla, Morelos State, Mexico. The new species differs from all other congeners in possessing a very well-developed and sacciform genital cone. This is the seventh species described for the genus and the first one recorded in Mexico.

  1. VARIACIÓN CARIOLÓGICA EN DIFERENTES FENOTIPOS DE Sciurus granatensis (RODENTIA, SCIURIDAE

    Directory of Open Access Journals (Sweden)

    CAROLINA ARANGO

    2007-01-01

    Full Text Available Siete ejemplares de Sciurus granatensis (ardilla colombiana de diferentes fenotipos según color, rescatadas del tráfico ilegal de fauna silvestre de Colombia fueron estudiadas. Mediante técnicas convencionales de bandeo cromosómico G, C, Q, R y NOR se estableció su cariotipo 2n=42. Se encontraron tres cariomorfos de acuerdo al Nú- mero Fundamental (NF y características propias de cada uno de los complementos ocasionadas por distintos rearreglos cromosómicos, lo cual sugiere que S. granatensis es un complejo de especies. No se observó relación entre cariotipo y fenotipo. La variación en el color del pelaje se debe probablemente a las condiciones ambientales.

  2. Modulation of parasitemia and antibody responce to Trypanosoma cruzy by cyclophosphamide in Calomys callosus (Rodentia, Cricetidae)

    OpenAIRE

    1992-01-01

    Calomys callosus a wild rodent, previously described as harboring Trypanosoma cruzi, has a low susceptibility to infection by this protozoan. Experiments were designed to evaluate the contribution of the immune response to the resistance to T. cruzi infection exhibited by C. calossus. Animals were submitted to injections of high (200 mg/kg body weight) and low (20 mg/kg body weight) doses of cyclophosphamide on days -1 or -1 and +5, and inoculated with 4 x 10³ T. cruzi on day O. Parasitemia, ...

  3. Development of the central nervous system in guinea pig (Cavia porcellus, Rodentia, Caviidae

    Directory of Open Access Journals (Sweden)

    Fernanda Menezes de Oliveira e Silva

    Full Text Available Abstract: This study describes the development of the central nervous system in guinea pigs from 12th day post conception (dpc until birth. Totally, 41 embryos and fetuses were analyzed macroscopically and by means of light and electron microscopy. The neural tube closure was observed at day 14 and the development of the spinal cord and differentiation of the primitive central nervous system vesicles was on 20th dpc. Histologically, undifferentiated brain tissue was observed as a mass of mesenchymal tissue between 18th and 20th dpc, and at 25th dpc the tissue within the medullary canal had higher density. On day 30 the brain tissue was differentiated on day 30 and the spinal cord filling throughout the spinal canal, period from which it was possible to observe cerebral and cerebellar stratums. At day 45 intumescences were visualized and cerebral hemispheres were divided, with a clear division between white and gray matter in brain and cerebellum. Median sulcus of the dorsal spinal cord and the cauda equina were only evident on day 50. There were no significant structural differences in fetuses of 50 and 60 dpc, and animals at term were all lissencephalic. In conclusion, morphological studies of the nervous system in guinea pig can provide important information for clinical studies in humans, due to its high degree of neurological maturity in relation to its short gestation period, what can provide a good tool for neurological studies.

  4. Phylogenetic relationships of extant zokors (Myospalacinae) (Rodentia, Spalacidae) inferred from mitochondrial DNA sequences.

    Science.gov (United States)

    Su, Junhu; Ji, Weihong; Wang, Jing; Gleeson, Dianne M; Zhou, Janwei; Hua, Limin; Wei, Yanming

    2014-04-01

    In this study, we use three mitochondrial markers, cytochrome b gene (Cyt b), NADH dehydrogenase subunit 4 (ND4) and control region (D-loop) to investigate the phylogenetic relationships of extant zokor species in Mysopalacinae. The phylogenetic tree constructed based on Cyt b strongly supports the monophyly genera Eospalax and Myospalax with E. fontanierii being the most ancient species in Eospalax. Further phylogenetic analyses of four species of Eospalax based on ND4 and D-loop sequences revealed two clades that correspond to two geographical distributions. The basal clade includes E. cansus which is mainly found on Loess Plateau (LP) and another clade including E. baileyi, E. smithii and E. rufescens that inhabits areas above 2000 m on Qinghai-Tibetan Plateau (QTP) and Qinling Mountains. Geographical events of QTP and LP may have played a major role in the diversification and evolution of Mysopalacinae.

  5. Heterakis spumosa Schneider, 1866 (Nematoda: Heterakidae in Rattus norvegicus (Rodentia: Muridae in Ica, Peru

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    Rufino Cabrera Ch.

    2014-06-01

    Full Text Available In this paper Heterakis spumosa Schneider, 1866 is redescribed. It is a parasitic heterakid nematoda living in the caecum of murid rodent, Rattus norvegícus "gray rat" from district of Parcona, province of Ica, Peru.

  6. Note on the Giant Woolly Gliding Squirrel Eupetaurus cinereus (Mammalia: Rodentia: Sciuridae in northern Pakistan

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    Jaffar Ud Din

    2015-07-01

    Full Text Available The Woolly Gliding Squirrel Eupetaurus cinereus is an extremely rare, localized, and endangered mammal and may constitute one of the endemic species of Pakistan. The species was rediscovered in northern Pakistan in the mid-1990s after a 70-year absence of records. All the previous information regarding this giant squirrel was limited to museum specimens, collected mostly from areas presently in northern Pakistan in the late 1800s. Sighting of the species is extremely challenging owing to its nocturnal behavior, low densities and the inhospitable terrain it is reported from. Here we report detailed information about the species collected during the rescue of a young male individual from Gilgit City followed by its successful release in its natural habitat. We report that the species is still facing human-induced threats and may disappear from the mountains of northern Pakistan if informed management measures are not taken. Moreover, the occurrence of the species outside its core distribution range, i.e., districts Gilgit and Diamer, still remains questionable; therefore, it is recommended that further in-depth research studies be undertaken to determine the status of the species across the entire reported range. 

  7. Comportamiento agresivo del macho del ratón de los volcanes Neotomodon alstoni (Rodentia: Cricetidae)

    OpenAIRE

    Granados, Humberto; Luis, Juana; Agustín CARMONA; Espinosa, Guillermo; Arenas, Teresa

    2015-01-01

    Se estudió el comportamiento agresivo de los machos del ratón de los volcanes, Neotomodon alstoni, con 50 pares de ratones que fueron clasificados como posibles dominantes (O) y subordinados (S) a través del Método de Melzack- Thompson. La agresividad se registró en las combinaciones: O vs. O y S vs. S. Se formaron dos grupos: Grupo 1 con 12 pares de machos O y 13 S, y Grupo Il con JI O y 14 S. En el Grupo I el nivel de agresividad se cuantificó después de una semana de apareamiento y después...

  8. Genetic diversity and population structure of the Guinea pig (Cavia porcellus, Rodentia, caviidae in Colombia

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    William Burgos-Paz

    2011-01-01

    Full Text Available The aim was to establish the genetic diversity and population structure of three guinea pig lines, from seven production zones located in Nariño, southwest Colombia. A total of 384 individuals were genotyped with six microsatellite markers. The measurement of intrapopulation diversity revealed allelic richness ranging from 3.0 to 6.56, and observed heterozygosity (Ho from 0.33 to 0.60, with a deficit in heterozygous individuals. Although statistically significant (p < 0.05, genetic differentiation between population pairs was found to be low. Genetic distance, as well as clustering of guinea-pig lines and populations, coincided with the historical and geographical distribution of the populations. Likewise, high genetic identity between improved and native lines was established. An analysis of group probabilistic assignment revealed that each line should not be considered as a genetically homogeneous group. The findings corroborate the absorption of native genetic material into the improved line introduced into Colombia from Peru. It is necessary to establish conservation programs for native-line individuals in Nariño, and control genealogical and production records in order to reduce the inbreeding values in the populations.

  9. Notocotylus loeiensis n. sp. (Trematoda: Notocotylidae from Rattus losea (Rodentia: Muridae in Thailand

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    Chaisiri K.

    2011-02-01

    Full Text Available Notocotylus loeiensis n. sp. (Trematoda: Notocotylidae is described from the cecum of the lesser rice field rat (Rattus losea, from Loei Province in Thailand with a prevalence of 9.1% (eight of 88 rats infected. The new species differs from previously described Notocotylus species mainly by the extreme prebifurcal position of the genital pore and the number of ventral papillae. This is the first description at the species level of Notocotylus from mammals in Southeast Asia.

  10. Habitats, population densities, and social structure of capybaras (Hydrochaeris Hydrochaeris, Rodentia in the Pantanal, Brazil

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    Cleber J.R. Alho

    1987-01-01

    Full Text Available (1 The Pantanal is the central portion of a sunken flat plain bordering the upper Paraguay river, with an area of 140,000 km². Seasonal floods begin in January and end in April. From May to October the land dries out and campos (grassland formations and scattered pools appear. (2 Typical capybara habitat in the Pantanal is composed of three components: the water, a patch of forest, and a grass field for foraging. Highest densities of capybaras (14 individuals/km² were found during the rainy season when the available space for capybaras was reduced due to the flooding. Areas without ponds or creeks presented low densities (from 0.38 to 0.84 capybaras/km². Group sizes ranged from 2 to 49 individuals (x = 9.48. (3 Reproduction occurred year-round and young of different ages were seen throughout the year. However, the principal recruitment of young to the population was observed in July-August. While the females took turns in caring for young of different ages, probably the offspring of mothers who are sisters in the same social groups, the males competed intensively with each other for access to breeding females. The male's reproductive success appears to be limited to the number of breeding females that males have access to in the social group.

  11. Karyotypic analysis in species of the genus Dasyprocta (Rodentia: Dasyproctidae found in Brazilian Amazon

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    ROSEMAR S. L. RAMOS

    2003-03-01

    Full Text Available A total of 30 animals of the genus Dasyprocta were cytogenetically studied. They belong to the following species: D. prymnolopha (N=20, D. leporina (N=6, D. fuliginosa (N=1 and Dasyprocta sp. (N=3 (Dasyproctidae, Hystricognathi. Cell suspensions were obtained by peripheral blood culture, besides bone marrow and spleen cells, from D. prymnolopha and D. leporina. The diploid number was 64/65 for all samples. The karyotypes showed similarity, and chromosomal polymorphism was not detected by Giemsa conventional staining and G banding. The constitutive heterochromatin distribution at the pericentromeric region of all the chromosomes was similar in all species. D. prymnolopha, D. leporina and Dasyprocta sp. presented variation in the heterochromatical block size at one of the homologues of the A18 pair. D. fuliginosa presented the heterochromatin uniformly distributed in all chromosomes. There was not variation in the NORs pattern in the species studied.Foram estudados citogeneticamente um total de 30 animais das espécies D. prymnolopha (N=20, D. leporina (N=6, D. fuliginosa (N=1 e Dasyprocta sp. (N=3 (Dasyproctidae, Histricognathi. As preparações cromossômicas foram obtidas do cultivo de sangue periférico, além de medula óssea e baço em D. prymnolopha e D. leporina. O número diplóide foi de 64/65 em todos os exemplares. O cariótipo mostrou similaridade, não sendo detectado, através de coloração convencional de giemsa e de banda G, polimorfismo cromossômico em qualquer uma das espécies estudadas. A distribuição da heterocromatina constitutiva na região pericentromérica de todos os cromossomos foi similar nas quatro espécies. D. prymnolopha, D. leporina e Dasyprocta sp. apresentaram variação no tamanho do bloco heterocromático em um dos homólogos do par A18. D. fuliginosa apresentou a heterocromatina uniformemente distribuída em todos os cromossomos. Não houve variação no padrão das RONs entre as esp��cies estudadas.

  12. Homomorphic sex chromosomes and the intriguing Y chromosome of Ctenomys rodent species (Rodentia, Ctenomyidae).

    Science.gov (United States)

    Suárez-Villota, Elkin Y; Pansonato-Alves, José C; Foresti, Fausto; Gallardo, Milton H

    2014-01-01

    Unlike the X chromosome, the mammalian Y chromosome undergoes evolutionary decay resulting in small size. This sex chromosomal heteromorphism, observed in most species of the fossorial rodent Ctenomys, contrasts with the medium-sized, homomorphic acrocentric sex chromosomes of closely related C. maulinus and C. sp. To characterize the sequence composition of these chromosomes, fluorescent banding, self-genomic in situ hybridization, and fluorescent in situ hybridization with an X painting probe were performed on mitotic and meiotic plates. High molecular homology between the sex chromosomes was detected on mitotic material as well as on meiotic plates immunodetected with anti-SYCP3 and anti-γH2AX. The Y chromosome is euchromatic, poor in repetitive sequences and differs from the X by the loss of a block of pericentromeric chromatin. Inferred from the G-banding pattern, an inversion and the concomitant prevention of recombination in a large asynaptic region seems to be crucial for meiotic X chromosome inactivation. These peculiar findings together with the homomorphism of Ctenomys sex chromosomes are discussed in the light of the regular purge that counteracts Muller's ratchet and the probable mechanisms accounting for their origin and molecular homology.

  13. Two new species of Hymenolepis (Cestoda: Hymenolepididae) from Spalacidae and Muridae (Rodentia) from eastern Palearctic.

    Science.gov (United States)

    Makarikov, Arseny A; Tkach, Vasyl V

    2013-03-01

    Previously unrecognized species of the genus Hymenolepis are described based on specimens from spalacid and murid (Murinae) rodents. Hymenolepis rymzhanovi sp. nov. from the Siberian zokor, Myospalax myospalax (Laxmann), from East Kazakhstan, and H. apodemi sp. nov. from Eurasian field mice, Apodemus peninsulae (Thomas), A. uralensis (Pallas) and A. agrarius (Pallas), from the south of Russian Far East, western Siberia and south-eastern Kazakhstan are characterized. The new species differ from other species of the genus by the morphology of the scolex, the relative position and length of the cirrus-sac and the relative position and arrangement of the testes. Differential criteria of species of Hymenolepis (sensu stricto) are also discussed.

  14. Cryptic speciation and chromosomal repatterning in the South African climbing mice Dendromus (Rodentia, Nesomyidae).

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    Solano, Emanuela; Taylor, Peter J; Rautenbach, Anita; Ropiquet, Anne; Castiglia, Riccardo

    2014-01-01

    We evaluate the intra- and interspecific diversity in the four South African rodent species of the genus Dendromus. The molecular phylogenetic analysis on twenty-three individuals have been conducted on a combined dataset of nuclear and mitochondrial markers. Moreover, the extent and processes underlying chromosomal variation, have been investigated on three species by mean of G-, C-bands, NORs and Zoo-FISH analysis. The molecular analysis shows the presence of six monophyletic lineages corresponding to D. mesomelas, D. mystacalis and four lineages within D. cfr. melanotis with high divergence values (ranges: 10.6% - 18.3%) that raises the question of the possible presence of cryptic species. The first description of the karyotype for D. mesomelas and D. mystacalis and C- and G- banding for one lineage of D. cfr. melanotis are reported highlighting an extended karyotype reorganization in the genus. Furthermore, the G-banding and Zoo-FISH evidenced an autosome-sex chromosome translocation characterizing all the species and our timing estimates this mutation date back 7.4 mya (Late Miocene). Finally, the molecular clock suggests that cladogenesis took place since the end of Miocene to Plio-Pleistocene, probably due to ecological factors, isolation in refugia followed by differential adaptation to the mesic or dry habitat.

  15. Karyotypic variation in the Andean rodent Phyllotisxanthopygus (Waterhouse, 1837) (Rodentia, Cricetidae, Sigmodontinae).

    Science.gov (United States)

    Labaroni, Carolina Alicia; Malleret, Matías Maximiliano; Novillo, Agustina; Ojeda, Agustina; Rodriguez, Daniela; Cuello, Pablo; Ojeda, Ricardo; Dardo Martí; Lanzone, Cecilia

    2014-01-01

    Phyllotisxanthopygus (Waterhouse, 1837) is an Andean rodent endemic to South America. Despite its wide geographical distribution in Argentina, few individuals have been studied on the cytogenetic level and only through conventional staining. In this work, chromosome characterization of Argentine samples of this species was performed using solid staining, C-banding and base-specific fluorochromes. Twenty two specimens were analyzed, collected in the provinces of Jujuy, Catamarca, and the north and south of Mendoza. All studied specimens showed 2n=38, having mostly the bi-armed autosomes, metacentric or submetacentric. Fundamental Number varied between 70 and 72. These changes were due to the presence of chromosome heteromorphisms in individuals from southern Mendoza and Jujuy. C-banding revealed pericentromeric blocks of constitutive heterochromatin in most chromosomes. Acrocentric chromosomes involved in heteromorphisms showed high variation in the amount of heterochromatin within and among populations. Additionally, banding with fluorochromes (DAPI and chromomycin A3) revealed homologous localization of AT and GC rich regions among chromosomes of the different populations analyzed. Comparisons among heteromorphic pairs suggested, however, that the variation might be the result of complex chromosome rearrangements, involving possibly amplifications and/or deletions of heterochromatic segments. These results are in accordance with molecular studies that indicate genetic variability within and among the populations of this taxon.

  16. Seasonal changes in body composition of Ctenomys talarum (Rodentia: Octodontidae): an herbivore subterranean rodent.

    Science.gov (United States)

    del Valle, Juana C; López Mañanes, Alejandra A; Busch, Cristina

    2006-09-01

    Ctenomys talarum is a subterranean herbivorous rodent whose burrow systems exhibit particular characteristics, distinct from other subterranean environments. We studied seasonal variation in body composition of C. talarum in relation to energetic requirements. Body lipid content seasonally changed in C. talarum, related to reproductive cycle and thermorregulatory mechanisms. A decrease in protein body content was found only in spring. Ash content of females was lowest when most of them are in post partum estro. Observed variations in water body content could be associated with plant water content and/or metabolic regulation. Our results show the occurrence of seasonal variations in body composition in C. talarum, which could be related to the high cost of reproduction and the subterranean life style of this species.

  17. First Miocene rodent from Lebanon provides the 'missing link' between Asian and African gundis (Rodentia: Ctenodactylidae).

    Science.gov (United States)

    López-Antoñanzas, Raquel; Knoll, Fabien; Maksoud, Sibelle; Azar, Dany

    2015-08-07

    Ctenodactylinae (gundis) is a clade of rodents that experienced, in Miocene time, their greatest diversification and widest distribution. They expanded from the Far East, their area of origin, to Africa, which they entered from what would become the Arabian Peninsula. Questions concerning the origin of African Ctenodactylinae persist essentially because of a poor fossil record from the Miocene of Afro-Arabia. However, recent excavations in the Late Miocene of Lebanon have yielded a key taxon for our understanding of these issues. Proafricanomys libanensis nov. gen. nov. sp. shares a variety of dental characters with both the most primitive and derived members of the subfamily. A cladistic analysis demonstrates that this species is the sister taxon to a clade encompassing all but one of the African ctenodactylines, plus a southern European species of obvious African extraction. As such, Proafricanomys provides the 'missing link' between the Asian and African gundis.

  18. Esqueletogênese em punaré (Thrichomys laurentinus- Rodentia, Echimyidae

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    Phelipe O. Favaron

    Full Text Available Resumo: O objetivo deste estudo foi descrever o desenvolvimento do esqueleto do punaré (Thrichomys laurentinus. Para tanto, foram utilizados 11 embriões e 12 fetos em diferentes estágios de desenvolvimento, sendo divididos em 4 grupos de acordo com o período gestacional. As amostras foram obtidas no Centro de Multiplicação de Animais Silvestres da Universidade Federal Rural do Semi-Árido, Mossoró-RN, Brasil. Após fixados em formol (10% ou glutaraldeído (2,5%, foi realizada a analise morfológica com auxílio de lupa, sendo as características macroscópicas fotodocumentadas. Análises de raios-x e coloração por alizarina red foram realizadas para melhor compreensão do desenvolvimento ósseo. Nas análises de raio-x os embriões não apresentaram nenhuma radiopacidade, ao contrário dos fetos que apresentavam radiopacidade gradual ao longo dos grupos. No grupo II houve aumento de radiopacidade na região da coluna vertebral e das regiões mandibular e maxilar. No grupo III a radiopacidade estava aumentada nos membros pélvicos, nas costelas e na região frontal e no grupo IV nos membros torácicos e nas regiões occipital, temporal e frontal do crânio. Tais características foram confirmadas pelas analises histológicas e pela técnica de Alizarina Red. Com isso podemos concluir que o conhecimento acerca da embriologia do sistema ósseo normal é fundamental para o entendimento dos efeitos adversos causados pela nutrição e uso de drogas durante o desenvolvimento.

  19. [Morphological variability of Microtus oeconomus pallas (Rodentia, Rrvicolidae) from Baikal region].

    Science.gov (United States)

    Pozdniakov, A A; Litvinov, Iu N; Demidovich, P A

    2006-01-01

    The analysis of morphological variability of the ten samples of Microtus oeconomus from islands of Baikal and adjacent regions gas shown, that island samples differ from continental ones by complex of parameters, defining proportions of a skuul, mainly, proportions of an auditory region. Island samples also differ higher indexes of complexity and asymmetry of morphotypes of the third upper molar. An environment of the Baikal islands differ absence of the damp habitats preferred Microtus oeconomus, and also colder microclimate that has caused forming original morphological character of island micropopulations.

  20. The role of seed mass on the caching decision by agoutis, Dasyprocta leporina (Rodentia: Agoutidae

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    Mauro Galetti

    2010-06-01

    Full Text Available It has been shown that the local extinction of large-bodied frugivores may cause cascading consequences for plant recruitment and overall plant diversity. However, to what extent the resilient mammals can compensate the role of seed dispersal in defaunated sites is poorly understood. Caviomorph rodents, especially Dasyprocta spp., are usually resilient frugivores in hunted forests and their seed caching behavior may be important for many plant species which lack primary dispersers. We compared the effect of the variation in seed mass of six vertebrate-dispersed plant species on the caching decision by the red-rumped agoutis Dasyprocta leporina Linnaeus, 1758 in a land-bridge island of the Atlantic forest, Brazil. We found a strong positive effect of seed mass on seed fate and dispersal distance, but there was a great variation between species. Agoutis never cached seeds smaller than 0.9 g and larger seeds were dispersed for longer distances. Therefore, agoutis can be important seed dispersers of large-seeded species in defaunated forests.

  1. A new karyotype for the genus Cavia from a southern island of Brazil (Rodentia - Caviidae

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    A. Gava

    1998-03-01

    Full Text Available Intraspecific karyotype variation in mammal species is very common and often caused by centromeric fusion of acrocentric chromosomes. We describe here a new karyotype 2n = 62 (FN = 112 for the genus Cavia from the Moleques do Sul Islands, of the southern coast of Brazil. We analyzed two male and four female karyotypes that had twenty-four biarmed pairs and six pairs of acrocentric chromosomes. The sexual pair consisted of a metacentric X-chromosome and a large acrocentric Y. C-bands were found in the centromeric and pericentromeric regions of almost all chromosomes, except for some small biarmed and acrocentric ones. Nucleolus organizer regions appeared in two biarmed chromosomes, and G-banding patterns were also seen.RESUMO A variação cariotípica nas espécies de mamíferos é bastante comum e geralmente causada pela fusão de cromossomos acrocêntricos. Foi descrito neste trabalho um novo cariótipo, com 2n = 62 e FN = 112, para o gênero Cavia proveniente das ilhas Moleques do Sul, da costa sul do Brasil. Foram analisados os cariótipos de dois machos e quatro fêmeas que possuiam 24 pares de cromossomos com dois braços e seis pares de acrocêntricos. O par sexual era constituído por um cromossomo X metacêntrico grande e um Y acrocêntrico. As bandas C estavam localizadas nas regiões centroméricas e pericentroméricas da maioria dos cromossomos, com exceção de alguns acrocêntricos e os cromossomos de dois braços menores. As regiões organizadoras de nucléolo ocorreram em dois cromossomos com dois braços e o padrão de bandamento G foi também apresentado.

  2. Fleas (Siphonaptera) in the Nests of Dormice (Gliridae: Rodentia) in Lithuania.

    Science.gov (United States)

    Lipatova, I; Stanko, M; Paulauskas, A; Spakovaite, S; Gedminas, V

    2015-05-01

    Negative effects of flea (Siphonaptera) parasitism on the host may be expressed in different ways. The aim of this study was to assess distribution of the flea fauna in nests of dormice in Lithuania. Nests of Glis glis (L.), Dryomys nitedula (Pallas), and Muscardinus avellanarius (L.) were collected from nest boxes in 2012 and 2013. Fleas were collected from nests in the laboratory and put into plastic tubes with 70% ethanol. Flea species were identified using morphological keys. From 400 nest boxes, 112 nests of dormice were collected from eight sites from mixed forests of central Lithuania. Twenty-three nests of G. glis were collected from nest boxes, with 16 of them containing 286 fleas belonging to four species: Ceratophyllus sciurorum (Schrank) (259), C. gallinae (Schrank) (23), Hystrichopsylla talpae (Curtis) (3), and Megabothris turbidus (Rothschild) (1). Fourteen nests of M. avellanarius were collected from nest boxes, 4 of which contained 224 fleas belonging to two species: C. sciurorum (221) and C. gallinae (3). Twenty-four nests of D. nitedula were collected from nest boxes, including 17 containing 207 fleas belonging to two species: C. sciurorum (205) and C. gallinae (2). Fifty-one nests of undetermined dormice species also were collected from nest boxes, 12 of them contained 395 fleas belonging to three species: C. sciurorum (374), Ctenophthalmus agyrtes (Heller) (19), and Ctenophthalmus assimilis (Taschenberg) (2). C. sciurorum was a predominant species in the nests of dormice. The occurrence of C. gallinae was documented in Lithuania for the first time.

  3. Isozyme and allozyme markers distinguishing two morphologically similar, medically important Mastomys species (Rodentia: Muridae

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    Van der Bank Herman FH

    2001-09-01

    Full Text Available Abstract Background Two common southern African mice species, Mastomys coucha and M. natalensis, are widely distributed throughout the subregion and overlap in many areas. They also share a high degree of morphological similarity, making them impossible to distinguish in the field at present. These multimammate mice are documented carriers of serious disease vectors causing Lassa fever, plague and encephalomyocarditis, which coupled to their cohabitation with humans in many areas, could pose a significant health risk. A preliminary study reported the presence of isozyme markers at three loci (GPI-2, PT-2, -3 in one population each of M. coucha and M. natalensis. Two additional populations (from the Vaal Dam and Richards Bay were sampled to determine the reliability of these markers, and to seek additional genetic markers. Results Fifteen proteins or enzymes provided interpretable results at a total of 39 loci. Additional fixed allele differences between the species were detected at AAT-1, ADH, EST-1, PGD-1, Hb-1 and -2. Average heterozygosities for M. coucha and M. natalensis were calculated as 0.018 and 0.032 respectively, with a mean genetic distance between the species of 0.26. Conclusions The confirmation of the isozyme and the detection of the additional allozyme markers are important contributions to the identification of these two medical and agricultural pest species.

  4. Ectoparasites of the critically endangered insular cavy, Cavia intermedia (Rodentia: Caviidae, southern Brazil

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    André Luis Regolin

    2015-04-01

    Full Text Available Cavia intermedia is a rodent species critically endangered and is found only on a 10 hectare island off the southern Brazilian coast. To identify the ectoparasites of C. intermedia, 27 specimens (14 males and 13 females, representing approximately 65% of the estimated total population, were captured and examined. A total of 1336 chewing lice of two species were collected: Gliricola lindolphoi (Amblycera: Gyropidae and Trimenopon hispidum (Amblycera: Trimenoponidae. In addition, chiggers Arisocerus hertigi (Acari: Trombiculidae and Eutrombicula sp. (Acari: Trombiculidae were collected from the ears of all captured animals. This low species richness compared to those for other Cavia species is expected for island mammals. Although the results presented here are not conclusive about the relationship between C. intermedia and ectoparasites, this low species richness found might be reflected in a low level of investment by the hosts in the basal immune defense, since investments in white blood cell production by mammals are influenced by the diversity of parasites in the environment. Additionally, considering that it might result in host vulnerability to other parasites that might be introduced through exotic or migratory host species, the monitoring of C. intermedia, including parasitological and immunological assessments, is recommended as a key component of conservation efforts.

  5. LATE PLEISTOCENE RODENTS (MAMMALIA: RODENTIA FROM THE BARANICA CAVE NEAR KNJAZEVAC (EASTERN SERBIA: SYSTEMATICS AND PALAEOECOLOGY

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    KATARINA BOGICEVIC

    2011-07-01

    Full Text Available Baranica is a cave in the Balkan mountain range in the eastern part of Serbia. It contains four layers of sediments of Quaternary age. The Upper Pleistocene deposits (layers 2-4 have yielded a rich and diverse assemblage of vertebrate fauna, including fish, amphibians, reptiles, birds, and small and large mammals. In this work, preliminary results of a study of the rodent fauna from the Upper Pleistocene deposits of the Baranica Cave (Knjazevac, eastern Serbia are presented. The fossil material comes from the 1995 archaeological excavation. The remains of 10 rodent species are described herein: Spermophilus cf. citelloides, Castor fiber, Sicista subtilis, Cricetulus migratorius, Cricetus cricetus, Mesocricetus newtoni, Apodemus ex gr. sylvaticus-flavicollis, Spalax leucodon, Dryomys nitedula, and Muscardinus avellanarius. Along with eight vole species, this makes altogether 18 species of rodents found in this locality. Both layers 2 and 4 (layer 3 is very poor in fossils have yielded a rodent fauna typical for the cold periods of the Late Pleistocene on the Balkan Peninsula, with a prevalence of open and steppe inhabitants, but some forest dwellers were also present. The assemblages from these layers are similar, but there are some differences in the composition of the fauna, which may indicate a slight shift towards drier conditions. They have also been compared to rodent associations from some Serbian and Bulgarian localities of the same age and their similarities and differences are discussed. SHORT NOTE-NOTA BREVE

  6. Re-evaluation of Sinocastor (Rodentia: Castoridae with implications on the origin of modern beavers.

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    Natalia Rybczynski

    Full Text Available The extant beaver, Castor, has played an important role shaping landscapes and ecosystems in Eurasia and North America, yet the origins and early evolution of this lineage remain poorly understood. Here we use a geometric morphometric approach to help re-evaluate the phylogenetic affinities of a fossil skull from the Late Miocene of China. This specimen was originally considered Sinocastor, and later transferred to Castor. The aim of this study was to determine whether this form is an early member of Castor, or if it represents a lineage outside of Castor. The specimen was compared to 38 specimens of modern Castor (both C. canadensis and C. fiber as well as fossil specimens of C. fiber (Pleistocene, C. californicus (Pliocene and the early castorids Steneofiber eseri (early Miocene. The results show that the specimen falls outside the Castor morphospace and that compared to Castor, Sinocastor possesses a: 1 narrower post-orbital constriction, 2 anteroposteriorly shortened basioccipital depression, 3 shortened incisive foramen, 4 more posteriorly located palatine foramen, 5 longer rostrum, and 6 longer braincase. Also the specimen shows a much shallower basiocciptal depression than what is seen in living Castor, as well as prominently rooted molars. We conclude that Sinocastor is a valid genus. Given the prevalence of apparently primitive traits, Sinocastor might be a near relative of the lineage that gave rise to Castor, implying a possible Asiatic origin for Castor.

  7. Spatial use of rodents (Rodentia: Mammalia host body surface by ectoparasites

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    E. B. BITTENCOURT

    Full Text Available We studied the ectoparasite and the Amblyopinini beetle fauna associated with four small mammal species of the Atlantic Rainforest of Ilha Grande, an island located off the southern Rio de Janeiro State Coast, Southeastern Brazil, analyzing to what extent the parasites were specific to each region of the host body. During the study, a total of 90 individual rodents were captured: 61 Proechimys iheringi Thomas, 1911 (Echymyidae, 22 Sciurus aestuans (Thomas, 1901 (Sciuridae, 4 Oxymycterus sp. (Waterhouse, 1837, and 2 Nectomys squamipes (Brants, 1827 (Sigmodontinae. The data showed that the ectoparasites and Amblyopinini on some rodent hosts in Ilha Grande tend to prefer particular host body sites, and that some ectoparasite species sites may overlap owing to their inaccessibility to the host.

  8. The cuticular profile of the aristiform hair as a characteristic feature of Abrawayaomys (Rodentia: Cricetidae

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    Tarcísio de Souza Duarte

    2015-08-01

    Full Text Available ABSTRACT The cuticle is the outermost of the three cellular layers of the mammalian hair. It comprises numerous keratinized scales, whose morphology, combined with other microscopic characteristics of the hair, confers characteristic signature traits to various different species. This study aimed to analyze whether the cuticular patterns of the aristiform hair had any signature implications for the two species of the genus Abrawayaomys Cunha & Cruz, 1979. We identified the cuticular profiles of A. ruschi and A. chebezi. Both species have similar hair pattern. The base of the hair shows "irregular waved" scales with smooth and continuous edges, and the apex showed "transversal waved" small-sized scales with continuous and ornamented edges. The middle portion of the hair exhibits different cuticular patterns on different sides of a single hair follicle: "transversal waved" on the dorsal side and "narrow losangled" on the ventral side. This distribution pattern of the cuticular scales is an unprecedented record for any mammal, and it is an important generic feature that allows the identification of single samples, such as those found in predators' gastrointestinal contents. The species in question are considered rare due to the restricted number of specimens deposited in scientific collections. Our findings may contribute to expanding the species' geographic range by making it possible to identify it in various situations. These results highlight the relevance of studies pertaining the identification of the micromorphology of the aristiform hair, which can be used as a tool to accurately identify rodents.

  9. Accelerated molecular evolution in Microtus (Rodentia) as assessed via complete mitochondrial genome sequences.

    Science.gov (United States)

    Triant, Deborah A; Dewoody, J Andrew

    2006-01-01

    Microtus is one of the most taxonomically diverse mammalian genera, including over 60 extant species. These rodents have evolved rapidly, as the genus originated less than 2 million years ago. If these numbers are taken at face value, then an average of 30 microtine speciation events have occurred every million years. One explanation for the rapid rate of cladogenesis in Microtus could be the karyotypic differentiation exhibited across the genus: diploid numbers range from 17 to 64. Despite the striking chromosomal variability within Microtus, phenotypic variation is unremarkable. To determine whether nucleotide substitution rates are also elevated in voles, we sequenced the entire mitochondrial DNA (mtDNA) genome of the Eurasian sibling vole (Microtus rossiaemeridionalis). We compared this genome to another previously sequenced vole mtDNA genome (Microtus kikuchii) and performed pairwise sequence comparisons with the mtDNA genomes of ten additional mammalian genera. We found that microtine mtDNA genomes are evolving more rapidly than any other mammalian lineage we sampled, as gauged by the rate of nucleotide substitution across the entire mtDNA genome as well as at each individual protein-coding gene. Additionally, we compared substitution rates within the cytochrome b gene to seven other rodent genera and found that Microtus mtDNA is evolving fastest. The root cause of accelerated evolution in Microtus remains uncertain, but merits further investigation.

  10. Rattus norvegicus (Rodentia: Muridae Infected by Leishmania (Leishmania infantum (syn. Le. chagasi in Brazil

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    Fabiana de Oliveira Lara-Silva

    2014-01-01

    Full Text Available In the present study we surveyed the fauna of phlebotomine sand flies and small mammals in peridomestic areas from a Brazilian municipality where the American cutaneous leishmaniasis (ACL is endemic. A total of 608 female phlebotomine sand flies were captured during nine months in 2009 and 2010. Seven different species were represented with 60% of them being Lutzomyia intermedia and Lu. whitmani, both incriminated vectors of ACL. Lu. longipalpis, a proven vector of visceral leishmaniasis (VL was also captured at high proportion (12.8%. Genomic DNA analysis of 136 species-specific pools of female sand flies followed by molecular genotyping showed the presence of Leishmania infantum DNA in two pools of Lu. longipalpis. The same Leishmania species was found in one blood sample from Rattus norvegicus among 119 blood and tissue samples analysed. This is the first report of Le. infantum in R. norvegicus in the Americas and suggests a possible role for this rodent species in the zoonotic cycle of VL. Our study coincided with the reemergence of VL in Governador Valadares.

  11. Are ribosomal DNA clusters rearrangement hotspots? A case study in the genus Mus (Rodentia, Muridae

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    Douzery Emmanuel JP

    2011-05-01

    Full Text Available Abstract Background Recent advances in comparative genomics have considerably improved our knowledge of the evolution of mammalian karyotype architecture. One of the breakthroughs was the preferential localization of evolutionary breakpoints in regions enriched in repetitive sequences (segmental duplications, telomeres and centromeres. In this context, we investigated the contribution of ribosomal genes to genome reshuffling since they are generally located in pericentromeric or subtelomeric regions, and form repeat clusters on different chromosomes. The target model was the genus Mus which exhibits a high rate of karyotypic change, a large fraction of which involves centromeres. Results The chromosomal distribution of rDNA clusters was determined by in situ hybridization of mouse probes in 19 species. Using a molecular-based reference tree, the phylogenetic distribution of clusters within the genus was reconstructed, and the temporal association between rDNA clusters, breakpoints and centromeres was tested by maximum likelihood analyses. Our results highlighted the following features of rDNA cluster dynamics in the genus Mus: i rDNA clusters showed extensive diversity in number between species and an almost exclusive pericentromeric location, ii a strong association between rDNA sites and centromeres was retrieved which may be related to their shared constraint of concerted evolution, iii 24% of the observed breakpoints mapped near an rDNA cluster, and iv a substantial rate of rDNA cluster change (insertion, deletion also occurred in the absence of chromosomal rearrangements. Conclusions This study on the dynamics of rDNA clusters within the genus Mus has revealed a strong evolutionary relationship between rDNA clusters and centromeres. Both of these genomic structures coincide with breakpoints in the genus Mus, suggesting that the accumulation of a large number of repeats in the centromeric region may contribute to the high level of chromosome repatterning observed in this group. However, the elevated rate of rDNA change observed in the chromosomally invariant clade indicates that the presence of these sequences is insufficient to lead to genome instability. In agreement with recent studies, these results suggest that additional factors such as modifications of the epigenetic state of DNA may be required to trigger evolutionary plasticity.

  12. Another one bites the dust: bite force and ecology in three caviomorph rodents (Rodentia, Hystricognathi).

    Science.gov (United States)

    Becerra, Federico; Echeverría, Alejandra Isabel; Casinos, Adrià; Vassallo, Aldo Iván

    2014-04-01

    Mammals have developed sophisticated strategies adapting to particular locomotor modes, feeding habits, and social interactions. Many rodent species have acquired a fossorial, semi-fossorial, or even subterranean life-style, converging on morphological, anatomical, and ecological features but diverging in the final arrangement. These ecological variations partially depend on the functional morphology of their digging tools. Muscular and mechanical features (e.g., lever arms relationship) of the bite force were analyzed in three caviomorph rodents with similar body size but different habits and ecological demands of the jaws. In vivo forces were measured at incisors' tip using a strain gauge load cell force transducer whereas theoretical maximal performance values, mechanical advantages, and particular contribution of each adductor muscle were estimated from dissections in specimens of Ctenomys australis (subterranean, solitary), Octodon degus (semi-fossorial, social), and Chinchilla laniger (ground-dweller, colonial). Our results showed that C. australis bites stronger than expected given its small size and C. laniger exhibited the opposite outcome, while O. degus is close to the expected value based on mammalian bite force versus body mass regressions; what might be associated to the chisel-tooth digging behavior and social interactions. Our key finding was that no matter how diverse these rodents' skulls were, no difference was found in the mechanical advantage of the main adductor muscles. Therefore, interspecific differences in the bite force might be primarily due to differences in the muscular development and force, as shown for the subterranean, solitary and territorial C. australis versus the more gracile, ground-dweller, and colonial C. laniger.

  13. Early evolutionary differentiation of morphological variation in the mandible of South American caviomorph rodents (Rodentia, Caviomorpha).

    Science.gov (United States)

    Alvarez, A; Perez, S I; Verzi, D H

    2011-12-01

    Caviomorphs are a clade of South American rodents recorded at least since the early Oligocene (> 31.5 Ma) that exhibit ample eco-morphological variation. It has been proposed that phylogenetic structure is more important than ecological factors for understanding mandibular shape variation in this clade. This was interpreted as a result of the long-standing evolutionary history of caviomorphs and the early divergence of major lineages. In this work, we test this hypothesis through the analysis of morphological variation in the mandible of living and extinct species and compare this information with that obtained through comparative phylogenetic analyses. Our results support the hypothesis of early origin of mandibular variation; moreover, they suggest the conservation of early differentiated morphologies, which could indicate the existence of constrained evolutionary diversification.

  14. Scaling and adaptations of incisors and cheek teeth in caviomorph rodents (Rodentia, Hystricognathi).

    Science.gov (United States)

    Becerra, Federico; Vassallo, Aldo I; Echeverría, Alejandra I; Casinos, Adrià

    2012-10-01

    The South American hystricognath rodents are one of the most diverse mammalian clades considering their occupied habitats, locomotor modes and body sizes. This might have been partly evolved by diversification of their masticatory apparatus' structure and its ecological commitment, for example, chisel-tooth digging. In this phylogeny-based comparative study, we test the relationship between ecological behavior and mechanical features of their incisors and molariforms. In 33 species of nine families of caviomorph rodents, we analyze incisor attributes related to structural stress resistance and molar features related with grinding capacity, for example, second moment of inertia and enamel index (EI) (enamel band length/occlusal surface area), respectively. Most of these variables scaled isometrically to body mass, with a strong phylogenetic effect. A principal component analysis discrimination on the EI clustered the species according to their geographic distribution. We presume that selective pressures in Andean-Patagonian regions, on particular feeding habits and chisel-tooth digging behaviors, have modeled the morphological characteristics of the teeth. Subterranean/burrower ctenomyids, coruros, and plains viscachas showed the highest bending/torsion strength and anchorage values for incisors; a simplified enamel pattern in molariforms would be associated with a better grinding of the more abrasive vegetation present in more open and drier biomes.

  15. Two new species of Hymenolepis (Cestoda: Hymenolepididae) from murid rodents (Rodentia: Muridae) in the Philippines.

    Science.gov (United States)

    Makarikov, Arseny A; Tkach, Vasyl V; Bush, Sarah E

    2013-10-01

    Two previously unrecognized species of the genus Hymenolepis are described based on specimens obtained from murid rodent species Bullimus luzonicus , Apomys microdon , and Rattus everetti collected on Luzon Island, Philippines. Hymenolepis bicauda n. sp. differs from all known Hymenolepis spp. in relative position of the poral dorsal and ventral osmoregulatory canals, gravid uterus occupying less than half the length of proglottid, relatively few eggs, and the highly characteristic longitudinal split of proglottids at the end of the gravid strobila. Hymenolepis haukisalmii n. sp. differs from all known Hymenolepis spp. in the relative position of both poral and aporal dorsal and ventral osmoregulatory canals and uterus lacking dorsal and ventral diverticula. The shift in the relative position of the dorsal and ventral osmoregulatory canals was not known in Hymenolepis from rodents in other regions of the world and is reminiscent of the situation observed in Hymenolepis erinacei, parasitic in hedgehogs, and members of the genus Talpolepis, parasitic in moles. The cosmopolitan species Hymenolepis diminuta was the only member of the genus previously reported from the Philippines.

  16. Helminthes of synanthropic rodents (Rodentia: Muridae) from Dakahlia and Menoufia, Egypt.

    Science.gov (United States)

    Elshazly, Atef M; Awad, Soha I; Azab, Manar S; Elsheikha, Hany M; Abdel-Gawad, Abdel Gawad E; Khalil, Hazem H M; Morsy, Tosson A

    2008-12-01

    A cross-sectional survey was conducted to monitor and compare the prevalence of helminthes in rodents from Dakahlia and Menoufia governorates. The domestic rodents (271) were Rattus norvegicus, Rattus rattus frugivorous, Rattus r. alexandrinus, & Mus musculus. The overall prevalence of helminthes was 52.8%. In Dakahlia, 72/145 rats (49.6%) were infected. The highest prevalence of infection was in R. r. frugivorous 43 (60.4%), then R. r. alexandrinus 44 (47.7%), R. norvegicus 38 (44.7%), and the lowest was M. musculus 20 (40%). In Menoufia, 71/126 rats (56.3%) were infected. The highest prevalence of infection was in R. r. frugivorous 36 (77.7%), then M. musculus 27 (48.1%), R. norvegicus 23 (47.8%), and the lowest was in R. r. alexandrinus 40 (47.5%). A total of 24 species of helminthes (11 trematodes, 4 cestodes & 10 nematodes) were identified among the 271 rodents. The commonest trematode was Mesostephanus aegypticus followed by Stictodora tridactyla. The commonest cestode was Hymenolepis diminuta followed by Taenia taeniaformis. The commonest nematode was Capillaria hepatica followed by Trichurus muris. Given the zoonotic potential of rodents' parasites and since several residential, commercial, and agricultural sites exist in the examined geographic areas, the potential health risk should not be ignored.

  17. On the systematic position of the Western Hamster, Cricetus cricetus canescens Nehring (Mammalia: Rodentia)

    NARCIS (Netherlands)

    Husson, A.M.

    1959-01-01

    The systematic position of the western hamster, Cricetus cricetus canescens, has been a subject of discussion and criticism ever since NEHRING (1899, pp. 1—2) described the hamster occurring in Belgium west of the Meuse as a separate variety. The present paper is a new effort to throw more light on

  18. Entwicklungsstufen der miozänen Cricetodontinae (Mammalia, Rodentia) Mittelspaniens und ihre stratigraphische Bedeutung

    NARCIS (Netherlands)

    Freudenthal, M.

    1963-01-01

    During the summer holidays of 1960 to 1963 a great many localities of Miocene and Pliocene mammals were discovered in the Southern part of Zaragoza province (Spain). Remains of both large and small mammals were found, the latter by sieving clays and marls. This small fauna consists mainly of Criceto

  19. In vitro activity on human gut bacteria of murta leaf extracts (Ugni molinae Turcz. ), a native plant from southern chile

    DEFF Research Database (Denmark)

    Shene, C.; Canquil, N.; Jorquera, M.

    2012-01-01

    Despite the fact that murta infusions have been used to treat gut/urinary infections by native Chileans for centuries, the mechanisms promoting such effects still remain unclear. As a first attempt to unravel these mechanisms, human fecal samples were incubated in a medium containing water extrac...

  20. Reassessment of morphology and historical distribution as factors in conservation efforts for the Endangered Patagonian Huemul Deer Hippocamelus bisulcus (Molina 1782

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    H.T. Force

    2012-11-01

    Full Text Available To assist with conservation of Endangered Patagonian Huemul Deer (Hippocamelus bisulcus, the Huemul Task Force (HTF reassessed information on appendicular morphology, paleobiogeography, and historical distribution as potential factors in recovery efforts. Traditional claims of being a mountain specialist of the Andes were refuted by empirical evidence showing huemul morphology to coincide with other cervids rather than the commonly implied homology to rock-climbing ungulates. It thus supports historical evidence of huemul in treeless habitat and reaching the Atlantic coast, which cannot be dismissed as past erroneous observations. Instead, pre- and post-Columbian anthropogenic impacts resulted in huemul displacement from productive sites and in survival mainly in remote and marginal refuge areas. The process of range contraction was facilitated by easy hunting of huemul, energetic incentives from seasonal fat cycles and huemul concentrations, the change from hunting-gathering to a mobile equestrian economy, and colonization with livestock. However, areas used presently by huemul, as supposed mountain specialists, are also used by wild and domestic ungulates that clearly are not considered mountain specialists, whereas the only other Hippocamelus successfully uses areas homologous to tree-less Patagonia. Rigid application of modern habitat usage to infer past habitat use and ignoring historic extra-Andean accounts is unwarranted; these conclusions reached by the HTF indicate new opportunities for recovery efforts by considering morphological and historical evidence. For instance, reintroductions to other portions of the landscape used formerly by huemul, which tend to be more productive sites than those currently occupied by many huemul groups, would present a promising avenue.

  1. Avaliação farmacognostica e da rotulagem das drogas vegetais boldo-do-chile (Peumus boldus Molina) e camomila (Matricaria recutita L.) comercializadas em Fortaleza, CE

    OpenAIRE

    F.P. SOARES; N.M. FREIRE; SOUZA, T. R. de

    2015-01-01

    RESUMO Boldo-do-chile (Peumus boldus) e camomila (Matricaria recutita) são plantas empregadas na fitoterapia principalmente para o tratamento de desordens hepáticas e intestinais, atuando também como anti-inflamatório e antiespasmódico, respectivamente. Por isso, o presente trabalho objetivou avaliar a qualidade farmacognostica dessas drogas vegetais comercializadas em Fortaleza (CE), além das informações de suas rotulagens. Quarenta e duas amostras de boldo, e quarenta e cinco amostras de ca...

  2. The physical, chemical and functional characterization of starches from Andean tubers: oca (Oxalis tuberosa Molina, olluco (Ullucus tuberosus Caldas and mashua (Tropaeolum tuberosum Ruiz & Pavón

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    Beatriz Valcárcel-Yamani

    2013-09-01

    Full Text Available The physical, chemical, and functional properties of starches isolated from the Andean tubers oca (Oxalis tuberosa M., olluco (Ullucus tuberosus C. and mashua (Tropaeolum tuberosum R. & P. were studied. The tubers were obtained from a local grocery. The morphology of the starch granules (size and shape was studied with scanning electron microscopy (SEM, which revealed ellipsoid, oval, conical, pear-shaped and prismatic forms: ellipsoids and oval granules with lengths up to 54.30 µm in oca; with lengths up to 32.09 µm for olluco starch granules; and with predominantly truncated spherical or oval forms and smaller dimensions (up to 16.29 um for mashua starch granules. Amylose contents were similar among the samples: 27.60% (oca, 26.49% (olluco and 27.44% (mashua. Olluco starch had less swelling power, forming opaque, less firm gels. All three starch gels showed the same stability on refrigeration and presented high syneresis under freezing temperatures, with a variation of 40.28 to 74.42% for olluco starch. The starches cooked easily, with high peak viscosity. The low gelatinization temperatures and high stability during cooling make these starches suitable feedstock for use in formulations that require milder processing temperatures and dispense freezing storage.

  3. Escherbothrium molinae n. gen. et n. sp. (Eucestoda: Tetraphyllidea: Triloculariidae) in Urotrygon chilensis (Chondrichthyes: Myliobatiformes: Urolophidae) from the Gulf of Nicoya, Costa Rica.

    Science.gov (United States)

    Berman, R; Brooks, D R

    1994-10-01

    Cestodes collected in spiral valves of the stingray Urotrygon chilensis from the Pacific coast of Costa Rica represent an undescribed species of Tetraphyllidea. By possessing more than 2 loculi as well as an apical sucker on each bothridium, the new species is diagnosably distinct from all other tetraphyllidean genera; therefore, a new genus is proposed for it. The new species also possesses globular structures irregularly arranged on the surface of the bothridia. We found similar structures on the bothridial faces of Trilocularia acanthiaevulgaris, possibly indicating phylogenetic relationships with the new species. This possibility is enhanced by the observation that the bothridia of T. acanthiaevulgaris comprise 2 loculi and an apical sucker, rather than 3 loculi.

  4. Avaliação farmacognostica e da rotulagem das drogas vegetais boldo-do-chile (Peumus boldus Molina e camomila (Matricaria recutita L. comercializadas em Fortaleza, CE

    Directory of Open Access Journals (Sweden)

    F.P. SOARES

    2015-09-01

    Full Text Available RESUMO Boldo-do-chile (Peumus boldus e camomila (Matricaria recutita são plantas empregadas na fitoterapia principalmente para o tratamento de desordens hepáticas e intestinais, atuando também como anti-inflamatório e antiespasmódico, respectivamente. Por isso, o presente trabalho objetivou avaliar a qualidade farmacognostica dessas drogas vegetais comercializadas em Fortaleza (CE, além das informações de suas rotulagens. Quarenta e duas amostras de boldo, e quarenta e cinco amostras de camomila, procedentes de farmácias, de lojas de produtos naturais e de bancas de raizeiros, foram analisadas quanto à autenticidade, à pureza e às informações contidas na rotulagem desses produtos conforme legislação vigente. Na verificação de impurezas, 35,7% das amostras de boldo e 57,7% das amostras de camomila excederam o teor máximo de matéria estranha; no teor de cinzas totais, 33,3% das amostras de boldo foram reprovadas; rotulagens das amostras de boldo (100% e de camomila (96,6% apresentaram erros ou ausência de informações. Os resultados das análises confirmam, portanto, a necessidade urgente de melhor fiscalização e intervenção na produção e venda dessas e de outras drogas vegetais para adequação às normas vigentes.

  5. El Código vital detrás de los espejos en “Con tal de no morir” de Vicente Molina Foix

    OpenAIRE

    Ramón-García, E. (Emilio)

    2013-01-01

    Con tal de no morir presenta doce mundos aparentemente inconexos llenos de ansiedades contemporáneas. Gracias a la numerología pitagórica, esta colección se muestra como el espejo de una serie de frustraciones y de intertextos culturales que se agrupan en triadas y que va más allá de lo aparente. Según la Gestalt, podríamos aceptar una lectura superficial, la tendencia de la experiencia perceptiva más común, pero al ahondar en los intertextos y en sus reagrupamientos descubrimos, siguiendo el...

  6. Infecção experimental de Calomys callosus (Rodentia-Cricetidae) com Leishmania donovani chagasi (Laison, 1982) Experimental infection of Calomys callosus (Rodentia-Cricetidae) with Leishmania donovani

    OpenAIRE

    Mello,Dalva A.; Maria Lucia Teixeira

    1984-01-01

    Foi descrita a infecção experimental em Calomys callosus com uma cepa de Leishmania donovani chagasi de caso humano. Um grupo de 22 roedores foi inoculado por via intraperitoneal com 0,1 ml de um macerado de baço em salina, rico em amastigotas. Esses animais foram sacrificados três meses após as inoculações, tendo sido realizado: cultura "in vitro" em meio acelular (LIT e NNN) e esfregaços, corados pelo Giemsa, de fígado, baço, medula óssea e sangue; cortes histológicos corados com hematoxili...

  7. Infecção experimental de Calomys callosus (Rodentia-Cricetidae com Leishmania donovani chagasi (Laison, 1982 Experimental infection of Calomys callosus (Rodentia-Cricetidae with Leishmania donovani

    Directory of Open Access Journals (Sweden)

    Dalva A. Mello

    1984-08-01

    Full Text Available Foi descrita a infecção experimental em Calomys callosus com uma cepa de Leishmania donovani chagasi de caso humano. Um grupo de 22 roedores foi inoculado por via intraperitoneal com 0,1 ml de um macerado de baço em salina, rico em amastigotas. Esses animais foram sacrificados três meses após as inoculações, tendo sido realizado: cultura "in vitro" em meio acelular (LIT e NNN e esfregaços, corados pelo Giemsa, de fígado, baço, medula óssea e sangue; cortes histológicos corados com hematoxilina-eosina de fígado e baço. Os resultados para fígado e baço foram: 67% de positividade nas culturas "in vitro"; esfregaços ricos em amastigotas intra e extra celular (inclui medula óssea; reações teciduais traduzidas por hepatomegalia com proliferação das células de Kupffer; reação granulomatosa das áreas portais, esplenomegalia com reações granulomatosas, abundância de formas amastigotas. Os resultados para o sangue foram negativos em todas as investigações.In the current paper experimental infection of Calomys callosus with Leishmania donovani is reported for the first time. A group of 22 C. callosus aged 20 months and weighing 25 g were inoculated with 0.1 of a homogeneous saline preparation of infected spleens of homologous animals. The L. donovani strain used in the experiments was isolated from a case of human visceral leishmaniasis from the state of Maranhão, Brazil. The animals infected were weighed and killed 3 months after the experimental infection. Spleens and livers were also weighed and pieces from them were fixed in 10% formaline and stained with hematoxilin-eosin for histological studies. Impression smears stained with Giemsa were made and cultivation "in vitro" (NNN and LIT was done, with material from blood, spleen, liver and bone marrow. At the end of the experiments the animals showed low of body weight. Splenomegaly was observed in all the inoculated animals. The "in vitro" cultures were positive from liver and spleen in 67% of the animals. Many extracellular and intracellular amastigote forms were seen in the smears of spleen, liver and bone marrow. Blood showed negative results. Histological studies of the liver showed proliferation of Kupffer cells and granulomatous reaction in the portal areas with multinucleated cells and amastigote forms of the parasites. Loss of folicular pattern with parasitism in great numbers of cells around which there were granulomatous reactions were observed in the spleen.

  8. Comportamiento social y reproductivo del roedor subterráneo solitario Ctenomys talarum (Rodentia: Ctenomyidae en condiciones de semicautiverio Social and reproductive behavior of the subterranean solitary rodent Ctenomys talarum (Rodentia: Ctenomyidae in a seminatural enclosure

    Directory of Open Access Journals (Sweden)

    ROXANA R. ZENUTO

    2002-03-01

    Full Text Available Se estudió el comportamiento social y reproductivo en grupos de individuos del roedor subterráneo Ctenomys talarum (Thomas, 1898 en condiciones seminaturales, que reflejaron la complejidad de las cuevas de la especie así como también la relación de sexos típica de poblaciones naturales. Los datos sugieren que las interacciones entre los individuos son mucho más variadas y complejas que lo esperado para una especie solitaria y territorial. Diferentes canales de comunicación _auditivo, táctil y olfativo- fueron importantes para el establecimiento y mantenimiento de territorios y durante el cortejo y la cópula. Se observaron diferencias en el comportamiento social entre individuos de poblaciones naturales con diferentes características ecológicas. Individuos pertenecientes a la población de Mar de Cobo, que presenta una alta densidad y una proporción de sexos desviada a favor de las hembras, establecieron jerarquías de dominancia entre los machos, lo que determinó el acceso preferencial por parte del macho dominante a varias hembras. La observación de daño físico (heridas fue común entre machos de la población de Mar de Cobo. En contraste, la agresión entre machos de la población de Necochea, que presenta una baja densidad y una proporción de sexos balanceada, usualmente no resultó en daño físico y no se detectó una jerarquía de dominancia; los machos cortejaron a las hembras aún en presencia de otros machosThe social and reproductive behavior of the subterranean rodent Ctenomys talarum (Thomas, 1898 was studied in a seminatural enclosure resembling both the complexity of the natural burrow system and the sex ratio observed in wild populations. Contrary to expectations based on their solitariness and their rather simple social system, the interactions among individuals of this species were diverse and complex. Auditory, tactile and chemical communication were of importance during territory guarding, courtship and copulatory behavior. Individuals from different populations differing in ecological attributes behaved in substantially different ways. Males from Mar de Cobo, a population characterized by a high density and a skewed sex ratio favouring females, behaved aggressively, which resulted in frequent wounding. Males from Mar de Cobo established a dominance hierarchy among them, which preceded courtship and, eventually, resulted in the dominant male monopolizing mating activity. On the contrary, males from Necochea, a population showing low density and an even sex ratio, behaved less aggressively; dominance relationships were absent, and males performed courtship behaviors in the presence of other males

  9. Dustbathing and intra-sexual communication of social degus, Octodon degus (Rodentia:Octodontidae Baños de tierra y comunicación intra-sexual en el degu social, Octodon degus (Rodentia: Octodontidae

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    LUIS A. EBENSPERGER

    2000-06-01

    Full Text Available I observed the behavior of captive male and female Octodon degus to assess if dustbathing behavior plays a role in social communication among unfamiliar, same-sex conspecifics. Degus of a first group (control responders were individually exposed during 10-min tests to an arena containing loose, clean soil. I compared the latency to first dustbathing as well as the overall frequency of dustbathing events recorded to control responders with the corresponding figures recorded to a second group of degus (experimental responders after they were individually introduced into the same arena but with soil previously used for dustbathing by a same-sex conspecific (depositor. I also compared the location of dustbathing events by experimental responders with that of depositor individuals. Although male degus tended to exhibit shorter latencies to first dustbathing event when in clean soil, this variable was not significantly influenced by sex of responders or the type of soil (clean or used. In contrast, a significant interaction between both factors revealed that males dustbathe at a higher rate than females when on clean soil, but similarly so when in a substratum previously dustbathed by a same-sex conspecific. The place chosen by both male and female responders to conduct their dustbathing behavior was unrelated to the presence of previous marks left by a depositor degu. I conclude that dustbathing is involved in communication during male-male, but not during female-female, interactions in the degu. I suggest that such male-male interactions represent competition for matesObservé el comportamiento de machos y hembras en cautiverio del roedor social Octodon degus para evaluar si la conducta de bañarse en tierra es parte de un mecanismo de comunicación social entre conespecíficos del mismo sexo, desconocidos entre sí. Un primer grupo de degus (respondientes controles fueron introducidos individualmente durante ensayos de 10 min a un terrario con tierra suelta y limpia (no usada previamente por otros degus. Comparé el tiempo transcurrido desde el inicio de cada experimento hasta la observación del primer baño de tierra (latencia así como el número total de baños de tierra realizados por cada respondiente control, con los valores equivalentes obtenidos de un segundo grupo de degus (respondientes experimentales, observados en la misma arena pero con tierra usada previamente por un conespecífico del mismo sexo (depositante. También comparé la ubicación espacial de los baños de tierra efectuados por respondientes experimentales con la posición de los baños de tierra realizados previamente por degus depositantes. Aunque los respondientes macho tendieron a mostrar una latencia más corta, esta variable no fue afectada significativamente ni por el sexo de los respondientes ni por el tipo de sustrato (limpio o usado. En cambio, una interacción significativa entre ambos factores mostró que los respondientes macho efectuaron un mayor número de baños de tierra que las hembras cuando ambos fueron expuestos a un sustrato limpio, pero que tales diferencias desaparecen cuando los individuos son expuestos a un sustrato usado previamente por otro individuo del mismo sexo. Los sitios de la arena seleccionados por respondientes macho y hembra para efectuar sus baños de tierra no estuvieron relacionados con la presencia de marcas dejadas por degus depositantes. Concluyo que los baños de tierra son usados por el degu como un mecanismo de comunicación olfativa durante interacciones entre machos, pero no entre hembras. Sugiero que tales interacciones entre machos representan competencia por apareamientos

  10. Dieta de Sciurus ingrami Thomas (Rodentia, Sciuridae em um remanescente de Floresta com Araucária, Paraná, Brasil Diet of Sciurus ingrami Thomas (Rodentia, Sciuridae on a Araucauria Pine Forest remnant, Paraná, Brazil

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    João M. D. Miranda

    2005-12-01

    Full Text Available Este estudo foi realizado entre fevereiro de 2002 e janeiro de 2003, em um remanescente de Floresta com Araucária, localizado no Distrito do Bugre, Município de Balsa Nova, Paraná, Brasil. O objetivo foi conhecer as espécies utilizadas na alimentação por Sciurus ingrami Thomas, 1901 no decorrer de um ano. Foram registradas dez (N = 10 espécies na dieta dos serelepes, pertencentes a sete famílias botânicas. Os serelepes predaram sementes de três espécies e se alimentaram de três espécies exóticas, mostrando adaptabilidade a ambientes alterados.This study was conducted between February, 2002 and January, 2003 in a remnant of Araucaria Pine Forest located in the District of Bugre, Municipality of Balsa Nova, Paraná, Brazil. The goal of this study was to survey the species used as food items by Sciurus ingrami Thomas, 1901 throughout a year. Ten (N = 10 species were recorded in the diet of these squirrels, belonging to seven plant families. Squirrels preyed on seeds of three plant species and fed on three exotic species, indicating good adaptability to disturbed habitats.

  11. Formas de abertura dos frutos de Syagrus romanzoffiana (Chamisso glassman efetuadas por Sciurus ingrami Thomas (Rodentia, Sciuridae Opening forms of palm nuts Syagrus romanzoffiana (Chamisso Glassman made by Sciurus ingrami Thomas (Rodentia, Sciuridae

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    Marcelo Bordignon

    1996-01-01

    Full Text Available In this work was identifyed the diferents opening forms of the palm nuts Syagrus romanzoffiana by brazilian squirrel Sciurus ingrami in four diferents points of Curitiba, Paraná, Brazil. Was caracterized tive basic forms of opening, in acording with the number of incisions and opening aspects. The form with lower number of incisions (two was also the greather frequently in the four points sampled (66,25%; N = 5194 well as registred the lower opening time (7,2 ± 1,7 min in relationship with other forms (9,2 ± 2,3 min. To explicate the diferences in the frequences of forms discovered, is proposed "apprenticeship's hypothesis" which the young squirrels of the population, along the opening nuts apprenticeship, to passing of the forms with larger number of incisions to forms with lower number of incisions, ending in the form of more frequence, which is maintained by adult squirrels.

  12. Habitat use and relative abundance of the Spotted Paca Cuniculus paca (Linnaeus, 1766 (Rodentia: Cuniculidae and the Red-rumped Agouti Dasyprocta leporina (Linnaeus, 1758 (Rodentia: Dasyproctidae in Guatopo National Park, Venezuela

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    Elinor Jax

    2015-01-01

    Full Text Available The Spotted Paca Cuniculus paca and the Red-rumped Agouti Dasyprocta leporina are affected by habitat loss and hunting.  In Venezuela, their conservation status is unknown, even within protected areas.  The objective of this study was to estimate the relative abundance, activity patterns, habitat use, and effect of human activities on these species in Venezuela.  To achieve this, 26 camera-trap stations (20.8km2 were established in Guatopo National Park between February and April 2011, characterization of the habitat was undertaken and occupancy models were created.  The relative abundance of the Spotted Paca was 1.62 captures/100trap-nights, with a fully nocturnal activity pattern.  The relative abundance of the Red-rumped Agouti was 2.32 captures/100trap-nights, with a pronounced diurnal activity pattern. The occupation probability of the Red-rumped Agouti (0.61 SE 0.02 was higher than that of the Spotted Paca (0.27 SE 0.02. Spotted Pacas were mainly found in areas with mature forest and high tree density, whereas the  Red-rumped Agoutis were most frequently found in valleys with little disturbed forest.  A positive correlation was found between illegal hunting activities and areas occupied by the Spotted Paca.  It is important to strengthen the park control measurements to reduce illegal hunting of Spotted Pacas.

  13. Estudio sistemático y bioestratigráfico de los Eomyidae (Rodentia) del Oligoceno superior y Mioceno inferior español = Taxonomy and biostratigraphy of Eomyidae (Rodentia) from the upper Oligocene and lower Miocene of Spain

    NARCIS (Netherlands)

    Alvarez Sierra, M.A.

    1987-01-01

    This paper is the first fundamental study on Spanish Eomyidae. The flourishing time of this family in Europe was the Late Oligocene and Early Miocene. Four genera are recognized in this time span: Rhodanomys Depéret & Douxami, 1902, Ritteneria Stehlin & Schaub, 1951, Pseudotheridomys Schlosser, 1926

  14. Modulation of parasitemia and antibody responce to Trypanosoma cruzy by cyclophosphamide in Calomys callosus (Rodentia, Cricetidae Modulação da parasitemia e da resposta de anticorpos ao Trypanosoma cruzi pela ciclofosfamida em Calomys callosus (Rodentia, Cricetidae

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    Monamaris Marques Borges

    1992-02-01

    Full Text Available Calomys callosus a wild rodent, previously described as harboring Trypanosoma cruzi, has a low susceptibility to infection by this protozoan. Experiments were designed to evaluate the contribution of the immune response to the resistance to T. cruzi infection exhibited by C. calossus. Animals were submitted to injections of high (200 mg/kg body weight and low (20 mg/kg body weight doses of cyclophosphamide on days -1 or -1 and +5, and inoculated with 4 x 10³ T. cruzi on day O. Parasitemia, mortality and antibody response as measured by direct agglutination of trypomastigotes were observed. Two hundred mg doses of cyclophosphamide resulted in higher parasitemia and mortality as well as in suppression of the antibody response. A single dose of 20 mg enhanced antibody levels on the 20th day after infection, while an additional dose did not further increase antibody production. Parasitemia levels were not depressed, but rather increased in both these groups as compared to untreated controls. Passive transfer of hyperimmune C. callosus anti-T. cruzi serum to cyclophosphamide immunosuppressed animals resulted in lower parasitemia and mortality rates. These results indicate that the immune response plays an important role in the resistance of C. callossus to T. cruzi.Calomys-callosus, roedor silvestre, que já foi encontrado naturalmente infectado pelo Trypanosoma cruzi, tem baixa suscetibilidade à infecção experimental por este protozoário. Foram feitos experimentos para avaliar a contribuição da resposta imune a essa baixa suscetibilidade. Animais foram submetidos a injeção de doses altas (200 mg/kg peso corporal ou doses baixas (20 mg/kg peso corporal de ciclofosfamida nos dias -1 ou -1 e +5, e inoculados com 4 x 10³ T. cruzi no dia O. Observou-se a curva de parasitemia, mortalidade e resposta de anticorpos medida por aglutinação direta de tripomastigotas. Doses de 200 mg resultaram em parasitemia e mortalidade mais elevada e supressão da resposta de anticorpos. Uma dose de 20 mg aumentou os níveis de anticorpos no 20º dia após a infecção, enquanto a administração de uma segunda dose não alterou significativamente a produção de anticorpos. Os níveis de parasitemia não diminuíram, mas pelo contrário, elevaram-se em relação aos animais testemunhos, em ambos os grupos. A transferência passiva de soro anti-T. cruzi de C. callosus resultou em parasitemia e mortalidade mais baixa nos animais imunossuprimidos. Estes resultados indicam que a resposta imune é um importante fator na resistência de C. callosus à infecção por T. cruzi.

  15. PATRONES DE REPLICACIÓN Y BANDEO NO DIFERENCIAL EN ARDILLAS COLOMBIANAS DEL GÉNERO Sciurus (RODENTIA, SCIURIDAE Replication Patterns and no Differential Banding in Colombian Squirrels, Sciurus (Rodentia, Sciuridae

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    CAROLINA ARANGO

    2012-05-01

    Full Text Available Las ardillas colombianas muestran una gran variabilidad citogenética lo que ha despertado el interés en ahondar aspectos evolutivos en el grupo. Para esto, varias herramientas de bandeo cromosómico convencional como bandas diferenciales Q y R y bandas no diferenciales C y NOR fueron analizadas permitiendo, por primera vez en las ardillas colombianas, detectar señales de cromosómicas inusuales de replicación e inactivación de heterocromatina y cromosomas marcadores específicos. Se explica la utilidad de cada uno de estos complementos en el análisis citogenético de especies y las observaciones para los citotipos de las ardillas colombianas.Colombian Squirrels cytogenetics showed a great variability which has renewed the interest in evolutionary aspects within the group. Many chromosome banding tools must be analyzed carefully in addition to the classical G-banding G technique. These techniques include other differential bands like Q and R banding and nondifferential banding (C and NOR. In this article the use of each of these supplements in the cytogenetic analysis of species and cytotypes observations for the Colombian squirrels is explained.

  16. Ritmos de actividad locomotora y uso de las cuevas en condiciones seminaturales en Ctenomys talarum (Rodentia, Octodontidae Rhythms of locomotor activity and burrow use under seminatural conditions in Ctenomys talarum (Rodentia, Octodontidae

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    FACUNDO LUNA

    2000-03-01

    Full Text Available Ctenomys es un género de roedores subterráneos que vive en sistemas de galerías cerrados a la superficie del suelo y por lo tanto lleva a cabo la mayoría de sus actividades en ausencia de luz. Sin embargo a diferencia de otros roedores subterráneos sus salidas a la superficie son frecuentes. En este trabajo fueron evaluadas, en Ctenomys talarum (Thomas, 1898 la existencia y las características de los ritmos locomotores de actividad para distintas condiciones experimentales. Además, fueron analizadas la permanencia y preferencia por distintos sectores del sistema de galerías. El 25 % de los individuos de C. talarum analizados, para las distintas condiciones de fotoperiodo y temperatura ambiente evaluadas, mostraron actividad rítmica. Por otra parte, los individuos no presentaron un patrón generalizado de permanencia y preferencia por sectores definidos en el sistema de galeríasCtenomys are subterranean rodents that perform most of their daily activities in dark, thermally stable burrow systems. In this paper the dependence of Ctenomys talarum (Thomas, 1898 activity rhythms on either photoperiod and ambient temperature was analyzed, as well as permanency and preference for different sectors of a burrow system. 25 % of the individuals showed rhythmicity in their activities. Thus, luminous stimuli and ambient temperature did not affect activity pattern in this species. Furthermore, individuals of C. talarum did not show any generalized pattern of preference and permanency on defined sectors of the artificial burrow system

  17. MYOCASTOR COYPUS (“COIPO”, RODENTIA, MAMMALIA COMO RECURSO EN LOS HUMEDALES DE LA PAMPA BOANERENSE: PATRONES DE EXPLOTACIÓN/Myocastor coypus (“coipo”, Rodentia, Mammalia as an archaeological resource in the wetlands of Buenos Aires Pampas: exploitation

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    Paula Escosteguy

    2012-11-01

    Full Text Available Myocastor coypus es una de las especies más abundantes en los humedales de la región pampeana, particularmente en las cuencas de los ríos Salado y Paraná. Distintas líneas de evidencia permiten sostener que fue un recurso ampliamente aprovechado siendo central en las estrategias económicas de los cazadores-recolectores-pescadores durante el Holoceno tardío. Se presentan los resultados obtenidos del análisis de restos arqueofaunísticos de esta presa mediano-pequeña, a partir de: análisis cuantitativos, estimación de clases de edad, análisis de huellas, termoalteraciones y fracturas. El objetivo es analizar los patrones de explotación del coipo utilizando información proveniente de los sitios de la localidad La Guillerma (LG1, LG4 y LG5 y San Ramón 7 (SR7 ubicados en el curso inferior del río Salado y del sitio Río Luján (RL y la localidad Cañada Honda (CH localizados en el NE bonaerense. Los resultados permiten sostener que la presión de captura se dio sobre presas adultas, que ingresaron completas a los sitios. Las huellas evidencian la ejecución de una serie de acciones para su aprovechamiento (cuereo, desarticulación y descarne. Abstract Myocastor coypus is one of the most abundant species found in archaeological sites in the Pampean Region wetlands, especially in the Salado and Paraná river basins. On the basis of different lines of evidence, it may be suggested that this animal was an extensively exploited resource, proving to be central in the strategies of hunter-gatherer-fishers that inhabited these regions during the Late Holocene. In this study, data obtained from archaeofaunal analysis are described: quantitative, age-class and butchering evidence analysis (cut marks, burning features and fracture patterns. We aim at analyzing the exploitation patterns of coypu using data found in La Guillerma (LG1, LG4 and LG5 and San Ramón 7 (SR7, pertaining to the lower Río Salado basin, and in Río Luján (RL and Cañada Honda (CH situated in the northeastern province of Buenos Aires. Results show that adult prey capture was practised, where the entire animal bodies had been introduced in the sites. Cut marks also evidence a series of tasks associated to exploitation (skinning, disarticulation and defleshing.

  18. Aprovechamiento de Myocastor coypus (Rodentia, Caviomorpha en sitios del Chaco Húmedo argentino durante el Holoceno tardío Myocastor coypus (Rodentia, Caviomorpha procurement at sites in the argentinean Chaco Humedo during the late Holecene

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    Mariano Santini

    2011-07-01

    Full Text Available De los mamíferos presentes en los sitios arqueológicos del Chaco Húmedo durante el Holoceno tardío, Myocastor coypus constituyó un recurso importante en la subsistencia de los grupos humanos que habitaron la zona de esteros, cañadas y selvas de ribera. El objetivo de este trabajo es presentar los resultados obtenidos del estudio de los materiales arqueofaunísticos correspondientes a M. coypus provenientes de los sitios El Cachapé Potrero V y Sotelo 1 (departamento Primero de Mayo, provincia del Chaco. Cronológicamente, estos sitios se sitúan entre los 1200 y 1690 años AP. Los materiales analizados ascienden a un NISP de 7868 y 4412 y un MNI de 251 y 259, para Potrero V y Sotelo 1, respectivamente, y representan el 84% y 77,1% del total de especímenes recuperados. Además del análisis cuantitativo se determinaron los perfiles etarios y se analizaron las modificaciones óseas, antrópicas y naturales, que permitieron identificar los agentes tafonómicos que intervinieron en la formación de los conjuntos muestreados. Los estudios mostraron que se realizó un aprovechamiento integral del coypo -al cual se lo utilizó tanto como fuente de alimento como de materia prima para la confección de instrumentos óseos-; y que, probablemente, también se haya aprovechado su cuero.Of the mammals from archaeological sites in Chaco Province, Myocastor coypus constituted an important subsistence resource for the human groups that inhabited the area of Esteros, Cañadas and Selvas de Ribera in the Late Holocene. The aim of this paper is to present the results of materials studies relating to M. coypus from the archaeological sites of El Cachapé Potrero 5 and Sotelo 1 (Primero de Mayo Department, Chaco Province. Chronologically, these sites are located between 1200 and 1690 years BP. The NISP was 7,868 and 4,412 and the MNI 251 and 259 for Potrero V and Sotelo I, respectively, accounting for 84% and 77.1% of all specimens recovered from the two archaeological sites. In addition to quantitative analysis, age profiles and osseous, anthropogenic, and natural modifications were analyzed, identifying the various taphonomic agents that influenced the formation of the samples. M. coypus was of great importance to the subsistence of human groups that inhabited the region. Such groups took full advantage of the rodent, using them not only as a food resource but also as a raw material for the manufacture of bone tools and probably also for their hides.

  19. A new Appenninic station of Dryomys nitedula Pallas, 1979 (Rodentia, Gliridae / Nuova stazione appenninica di Dryomys nitedula (Pallas, 1779 (Rodentia, Gliridae

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    Maria Grazia Filippucci

    1986-06-01

    Full Text Available Abstract A new record of Dryomys nitedula from the massif of Pollino (Southern Italy is given and the value of the subspecific division (D. nitedula intermedius, D. nitedula aspromontis in Italy is discussed. Riassunto Viene segnalato il ritrovamento di un esemplare di Dryomys nitedula sul Massiccio del Pollino e ridiscusso il valore della ripartizione sottospecifica (D. nitedula intermedius, D. nitedula aspromontis in Italia.

  20. Dietas de Abrothrix andinus, Phyllotis xanthopygus (Rodentia y Lepus europaeus (Lagomorpha en un ambiente altoandino de Chile Feeding habits of Abrothrix andinus, Phyllotis xanthopygus (Rodentia and Lepus europaeus (Lagomorpha in an Andean environment of Chile

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    FRANCISCO LÓPEZ-CORTÉS

    2007-03-01

    Full Text Available Los roedores nativos Abrothrix andinus, Phyllotis xanthopygus y el lagomorfo introducido Lepus europaeus, coexisten en ambientes altoandinos del centro-norte de Chile, donde la disponibilidad de alimento es escasa y distribuida heterogéneamente en el paisaje. Propusimos que en estos ambientes las especies en estudio se comportarían como herbívoros generalistas y que existiría una alta sobreposición en la dieta entre la liebre y los roedores nativos. El objetivo de este trabajo fue documentar la composición de la dieta de las tres especies y determinar su amplitud, preferencia y sobreposición en la dieta a partir del análisis microhistológico de heces frescas. Los resultados indican que las tres especies se comportaron como herbívoros-folívoros, siendo la dieta de L. europaeus la de mayor amplitud trófica. Abrothrix andinus seleccionó todos los ítemes que consume, mientras que P. xanthopygus y L. europaeus realizaron un consumo más oportunista. La mayor sobreposición en la dieta se observó entre los roedores nativosThe native rodents Abrothrix andinus, Phyllotis xanthopygus and the introduced lagomorph Lepus europaeus coexist in the highlands of north-central Chile, where food availability is scarce. We hypothesized that in these environments, the studied species would behave as generalist herbivores and where the diet of native rodents would overlap that of hares greatly. The aim of this study was to quantify feeding habits, amplitude, diet preferences and overlap of these three species through microhistological analysis of fresh faeces. While all three species behaved as herbivore-folivores, L. europaeus showed the largest niche breath. Abrothrix andinus selected all consumed items, while P. xanthopygus and L. europaeus exhibited a more opportunistic consumption food items. The highest diet overlap was observed between native rodents

  1. Infecção natural do Holochilus brasiliensis nanus Thomas, 1897 (Rodentia, cricetidae por Litomosoides carinii Natural infection of Holochilius brasiliensis nanus Thomas, 1897 (Rodentia, Cricetidae by Litomosoides carinii

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    J. C. Holanda

    1985-03-01

    Full Text Available É registrada a infecção natural do Holochilus brasiliensis nanus, um pequeno roedor semi-aquático da Baixada Ocidental do Estado do Maranhão, Brasil, por Litomosoides carinii.It is recorded the natural infection of Holochilus brasiliensis nanus, a small semi-aquatic rodent of the Occidental Lowland of Maranhão State, Brazil, by Litomosoides carinii.

  2. Temporal dynamics of milk composition of the precocial caviomorph Octodon degus (Rodentia: Octodontidae) Dinámica temporal de la composición de la leche del caviomorfo precocial Octodon degus (Rodentia: Octodentidae)

    OpenAIRE

    CLAUDIO VELOSO; G.J. KENAGY

    2005-01-01

    During lactation, both the nutritional and energetic requirements of suckling change gradually. These changes normally are accompanied by modifications in chemical composition of the milk. We investigated the temporal course of milk composition during lactation in a precocial caviomorph rodent, the "degu" (Octodon degus) under laboratory condition. Female degus were kept in laboratory during gestation and lactation and fed with commercial food pellets. Milk was collected at three stages of la...

  3. Dustbathing and intra-sexual communication of social degus, Octodon degus (Rodentia:Octodontidae) Baños de tierra y comunicación intra-sexual en el degu social, Octodon degus (Rodentia: Octodontidae)

    OpenAIRE

    Luis A. Ebensperger

    2000-01-01

    I observed the behavior of captive male and female Octodon degus to assess if dustbathing behavior plays a role in social communication among unfamiliar, same-sex conspecifics. Degus of a first group (control responders) were individually exposed during 10-min tests to an arena containing loose, clean soil. I compared the latency to first dustbathing as well as the overall frequency of dustbathing events recorded to control responders with the corresponding figures recorded to a second group ...

  4. Parâmetros hematológicos do roedor fossorial Ctenomys lami (Rodentia, Ctenomidae no estado do Rio Grande do Sul Hematological parameters of fossorial rodent Ctenomys lami (Rodentia, Ctenomidae in Rio Grande do Sul, Brazil

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    Gisele G. Stein

    2010-08-01

    Full Text Available O perfil hematológico sanguíneo foi determinado em três populações de Ctenomys lami, em áreas denominadas A e B, impactadas pela bovinocultura, e C, sem impacto antrópico, ambas no sul do Brasil. Sessenta e dois animais foram coletados ao total. Os valores de hematócrito (Ht, hemoglobina (Hb e eritrócitos apresentaram diferenças significativas entre machos e fêmeas. Os valores médios de Ht e a Hb encontrados na espécie foram mais baixos em comparação com os de outras espécies de roedores subterrâneos, podendo estes valores estarem relacionados ao habitat de forrageio ou às características do solo. Também foram encontradas diferenças significativas nas médias de hemoglobina, CHCM e linfócitos em animais das áreas A e B em relação à área C. O valor da média dos hematócritos dos animais entre as áreas foi mais elevado nas áreas A e B, porém significativamente diferentes entre A e C. Algumas dessas alterações sugerem a relação dos valores encontrados com o estresse dos animais em relação a áreas impactadas. Variações significativas no VCM foram encontradas entre os animais das áreas A e C, e também nas plaquetas destes entre as áreas A e B. Não foram observados Corpúsculo de Kurloff no sangue dos animais analisados. Os valores hematológicos encontrados nesses espécimes de Ctenomys lami fornecem informações importantes sobre a espécie e podem ser úteis em outras pesquisas.The hematological profile was determined in three populations of Ctenomys lami that inhabits three different areas nominated as A and B, affected by cattle production, and C, without human impact, all of them in southern Brazil, under the same geologic formation. Sixty two individuals were collected. The packed cell volume (PCV values, hemoglobin (Hb and red blood cell (RBC count presents statistic significant differences between males and females. PCV and Hb values were lower in comparison with other subterranean rodents, which could be related to the food searching behavior or soil characteristic of the species. Significant statistic differences were found to for Hb, mean corpuscular hemoglobin concentration (MCHC and lymphocytes between animals belonging to A and C areas. The PCV values were higher for animals from areas A and B, with significance only between A and C. Some of these alterations may suggest a modification on stress levels of the animals inhabiting areas A and B with anthropic alterations, or maybe just an inherited characteristic. Significant statistic differences were found either in mean corpuscular volume (MCV between A and C areas, and platelets between A and B areas. No Kurloff cells were observed in the blood smear from analyzed individuals. The hematological values founded for Ctenomys lami are an important information for this species, which can be used for future research and management.

  5. Molerats (Bathyergidae, Rodentia in South African National Parks: notes on the Taxonomic "isolation" and Hystricomorph Affinities of the family

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    G de Graaff

    1979-01-01

    Full Text Available The history of classification ofAfrotropical molerats is reviewed and an assessment is made of the supposed taxonomic "isolation" of the molerats (bathyergids by considering morphological features in the skull, post-cranial skeleton, reproductive organs and myology which collectively point to hystricomorph affinities in contrast to a myomorph relationship which is often postulated.

  6. Anatomia comparada e morfometria de oligoryzomys nigripes e o. flavescens (rodentia, sigmodontinae no Rio Grande do Sul, Brasil

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    Leonardo F. Machado

    2011-01-01

    Full Text Available Oligoryzomys nigripes e O. flavescens são amplamente distribuídos e simpátricos em diversos biomas. Os caracteres diagnósticos para seus reconhecimentos não são claramente estabelecidos. Neste estudo, foram realizadas a descrição e comparação da morfologia externa, anatomia do crânio, dentes, esqueleto pós crânio, morfologia estomacal e peniana. Análises estatísticas foram geradas a partir de dados morfométricos. A amostra consiste de 208 exemplares provenientes de 24 localidades do Brasil. O. nigripes é maior, com pelagem dorsal mais escura e pelagem ventral esbranquiçada e salpicada de preto. Crânio maior e mais robusto que O. flavescens. O. flavescens é menor, com pelagem dorsal levemente mais clara e ventre amarelado. O padrão de circulação cefálica das duas espécies é derivada de segundo tipo. Em O. flavescens são visualizados acidentes proeminentes na escápula e úmero, enquanto O. nigripes demonstrou maiores diferenças localizadas na crista íliaca, orientação do ísquio e acidentes proeminentes na tíbia e fíbula. A morfologia estomacal de ambos os táxons possui padrão Unilocular-hemiglandular. A morfologia do pênis consiste de báculo central tri-digitado. A análise de função discriminante reconhecem claramente a distinção de dois grupos homogêneos representados pelas espécies. Segundo o teste t duas variáveis morfométricas (largura da placa zigomática e largura do primeiro molar superior não são relevantes (P > 0.05 para a discriminação dos táxons. Dimorfismo sexual baseado na morfometria foi sustentado pelo teste t para O. nigripes. Em O. flavescens esta condição não é estatisticamente verificada.

  7. Comparative chromosome painting in six species of Oligoryzomys (Rodentia, Sigmodontinae and the karyotype evolution of the genus.

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    Camilla Bruno Di-Nizo

    Full Text Available Oligoryzomys belongs to the tribe Oryzomyini, and contains about 22 species. Diploid numbers range from 2n = 44 in Oligoryzomys sp. 2 to 2n = 72 in O. utiaritensis and phylogenetic relationships are not well defined. The high morphological convergence leads to misidentification of taxonomic entities and the species are often identified by chromosomal characters. Until now, the genus has been studied only by classical cytogenetic approaches. To understand the chromosomal evolution of Oligoryzomys, we developed chromosome probes from a female of Oligoryzomys moojeni (OMO with 2n = 70 and hybridized to other five Oligoryzomys species. The probes painted 31 segments on O. fornesi (OFO with 2n = 62; 32 segments on O. microtis (OMI, 2n = 64; 33 segments on O. nigripes (ONI, 2n = 62 and on O. rupestris (ORU, 2n = 46; and 34 on Oligoryzomys sp. 2 (OSP, 2n = 44. OMO probes 4 and 5 showed a syntenic association in O. fornesi, O. microtis and O. nigripes and were also presented in the same pair, although disrupted, in O. rupestris and Oligoryzomys sp. 2. Concerning O. rupestris and Oligoryzomys sp. 2, species with the lowest diploid numbers of the genus, a total of 8 probes hybridized to 11 segments on the largest pair of ORU 1 and 9 probes hybridized to 12 segments on OSP 1. Also, OMO 6 painted three segments in ORU, corresponding to the proximal segment of ORU 2q, and the whole of ORU 19 and 20. In OSP, the segment corresponding to ORU 20 was homologous to OSP 1p. OMO X showed signals of hybridization in both X and Y chromosomes. Extensive chromosomal rearrangements, that could not be detected by classical cytogenetic techniques, such as pericentric inversions or repositioning of centromeres, Robertsonian rearrangements and tandem fusions/fissions, as well as gain/activation or loss/inactivation of centromeres and telomeric sequences have driven the huge genome reshuffling in these closely related species.

  8. Karyotypic analyses and morphological comments on the endemic and endangered Brazilian painted tree rat Callistomys pictus (Rodentia, Echimyidae

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    Karen Ventura

    2008-01-01

    Full Text Available The genus Callistomys belongs to the rodent family Echimyidae, subfamily Echimyinae, and its only living representative is Callistomys pictus, a rare and vulnerable endemic species of the state of Bahia, Brazil. Callistomys has been previously classified as Nelomys, Loncheres, Isothrix and Echimys. In this paper we present the karyotype of Callistomys pictus, including CBG and GTG-banding patterns and silver staining of the nucleolus organizer regions (Ag-NORs. Comments on Callistomys pictus morphological traits and a compilation of Echimyinae chromosomal data are also included. Our analyses revealed that Callistomys can be recognized both by its distintinctive morphology and by its karyotype.

  9. Comparative chromosome painting in six species of Oligoryzomys (Rodentia, Sigmodontinae) and the karyotype evolution of the genus.

    Science.gov (United States)

    Di-Nizo, Camilla Bruno; Ventura, Karen; Ferguson-Smith, Malcolm Andrew; O'Brien, Patricia Caroline Mary; Yonenaga-Yassuda, Yatiyo; Silva, Maria José de J

    2015-01-01

    Oligoryzomys belongs to the tribe Oryzomyini, and contains about 22 species. Diploid numbers range from 2n = 44 in Oligoryzomys sp. 2 to 2n = 72 in O. utiaritensis and phylogenetic relationships are not well defined. The high morphological convergence leads to misidentification of taxonomic entities and the species are often identified by chromosomal characters. Until now, the genus has been studied only by classical cytogenetic approaches. To understand the chromosomal evolution of Oligoryzomys, we developed chromosome probes from a female of Oligoryzomys moojeni (OMO) with 2n = 70 and hybridized to other five Oligoryzomys species. The probes painted 31 segments on O. fornesi (OFO) with 2n = 62; 32 segments on O. microtis (OMI), 2n = 64; 33 segments on O. nigripes (ONI), 2n = 62 and on O. rupestris (ORU), 2n = 46; and 34 on Oligoryzomys sp. 2 (OSP), 2n = 44. OMO probes 4 and 5 showed a syntenic association in O. fornesi, O. microtis and O. nigripes and were also presented in the same pair, although disrupted, in O. rupestris and Oligoryzomys sp. 2. Concerning O. rupestris and Oligoryzomys sp. 2, species with the lowest diploid numbers of the genus, a total of 8 probes hybridized to 11 segments on the largest pair of ORU 1 and 9 probes hybridized to 12 segments on OSP 1. Also, OMO 6 painted three segments in ORU, corresponding to the proximal segment of ORU 2q, and the whole of ORU 19 and 20. In OSP, the segment corresponding to ORU 20 was homologous to OSP 1p. OMO X showed signals of hybridization in both X and Y chromosomes. Extensive chromosomal rearrangements, that could not be detected by classical cytogenetic techniques, such as pericentric inversions or repositioning of centromeres, Robertsonian rearrangements and tandem fusions/fissions, as well as gain/activation or loss/inactivation of centromeres and telomeric sequences have driven the huge genome reshuffling in these closely related species.

  10. Reproductive biology of the greater bandicoot rat Bandicota indica (Rodentia: Muridae) in the rice fields of southern Thailand

    Institute of Scientific and Technical Information of China (English)

    N.THITIPRAMOTE; J.SUWANJARAT; W.G.BREED

    2009-01-01

    This study investigated some aspects of the reproductive biology of male and female greater bandicoot rats,Bandicota indica,in southern Thailand from September 2004 to September 2006. In females,body,uterine and preputial gland weights,occurrences of pregnancies and placental scars,and in males,testicalar weights and histology,and sizes of accessory sex glands,were recorded. Pregnancies occurred predominantly,but not exclusively,in the wet season,with a higher incidence pregnancies in the second,than in the first,dry season. Uterine and preputial gland weights tended to be lower in the first,but not the second dry season,with placental scars occurring at all times of year. Males tended to have heavier testes in the wet season but some seminiferous tubules contained sperm even in the dry season. Seminal vesicles,but not prostates and preputial glands,tended to be heavier in animals in the wet season. We conclude that the greater bandieoot rat in southern Thailand shows maximal reproductive activity in the wet season with some reproductive activity,albeit variable from year to year,occurring in the dry season depending upon environmental conditions. This study has also shown that females,as well as males,have large preputial glands,and that males invariably have small testes regardless of the time of year. These observations suggest a similar timing of reproduction,but a different breeding biology and perhaps social organisation,from that of the sympatric ricefield rat,Rattus argentiventer.

  11. Reproductive biology of the greater bandicoot rat Bandicota indica (Rodentia: Muridae in the rice fields of southern Thailand

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    N. THITIPRAMOTE

    2009-02-01

    Full Text Available This study investigated some aspects of the reproductive biology of male and female greater bandicoot rats Bandicota indica in southern Thailand from September 2004 to September 2006. In females, body, uterine and preputial gland weights, occurrences of pregnancies and placental scars, and in males, testicular weights and histology, and sizes of accessory sex glands, were recorded. Pregnancies occurred predominantly, but not exclusively, in the wet season, with a higher incidence pregnancies in the second, than in the first, dry season. Uterine and preputial gland weights tended to be lower in the first, but not the second dry season, with placental scars occurring at all times of year. Males tended to have heavier testes in the wet season but some seminiferous tubules contained sperm even in the dry season. Seminal vesicles, but not prostates and preputial glands, tended to be heavier in animals in the wet season. We conclude that the greater bandicoot rat in southern Thailand shows maximal reproductive activity in the wet season with some reproductive activity, albeit variable from year to year, occurring in the dry season depending upon environmental conditions. This study has also shown that females, as well as males, have large preputial glands, and that males invariably have small testes regardless of the time of year. These observations suggest a similar timing of reproduction, but a different breeding biology and perhaps social organisation, from that of the sympatric ricefield rat, Rattus argentiventer [Current Zoology 55(1: 48–55, 2009].

  12. Association of the "IUCN vulnerable" spiny rat Clyomys bishopi (Rodentia: Echimyidae) with palm trees and armadillo burrows in southeastern Brazil.

    Science.gov (United States)

    Bueno, Adriana A; Lapenta, Marina J; Oliveira, Fátima; Motta-Junior, José C

    2004-12-01

    The globally vulnerable Clyomys bishopi, a semi-fossorial and colonial rodent, is apparently limited to cerrado (savannah-like vegetation) physiognomies in São Paulo State, Brazil. The aim of the study was to verify whether the presence of C. bishopi is associated to the occurrence of palm trees (Attalea gearensis, Syagrus loefgrenii) and armadillo burrows. Thirty six quadrats were placed in different physiognomies of cerrado vegetation at Itirapina Ecological Station, southeastern Brazil to survey the number of C. bishopi burrows of individuals of palm trees and burrows of armadillos. There was a strong dependence and association between the number of C. bishopi burrows and all measured variables (Contingency tables and Spearman rank correlations). It is suggested that this rodent can be found in great numbers where palm trees are abundant. The use of armadillo burrows possibly makes the movement of the rodents easier inside their own galleries.

  13. Genetic assessment of the Atlantic Forest bristle porcupine, Chaetomys subspinosus (Rodentia: Erethizontidae), an endemic species threatened with extinction.

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    Oliveira, C G; Martinez, R A; Giné, G A F; Faria, D M; Gaiotto, F A

    2011-05-24

    The bristle-spined porcupine, Chaetomys subspinosus, an endemic rodent from Atlantic Forest, was considered to be abundant in the recent past, but population reductions due to habitat loss and expansion of human activities caused this species to be included in the "vulnerable" category of the World Conservation Union Red List. We performed the first genetic assessment in natural populations of this focal species along its geographical distribution. Thirty-five non-invasive samples (hair) were collected from three natural populations in the Brazilian States of Sergipe, Bahia and Espírito Santo. Genetic similarity obtained by Jaccard's index, based on dominant RAPD and ISSR markers, varied between 25 and 100%. Four clusters, mainly coincident with the geographical distribution of the populations, were observed. Analysis of molecular variance based on 47 polymorphic loci showed that there was 15.99% genetic variability among populations and 84.01% within populations. The estimated genetic structure among populations (Φ(ST)) was 0.16. The populations may have formed a continuum along the past distribution of the Atlantic rainforest but historical events of human occupation resulted in recent divergence among sampled populations.

  14. The capybara, Hydrochoerus hydrochaeris (Mammalia: Rodentia, found at the archaeological site SC PRV 02, Santa Catarina Island, Brasil

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    Paulo César Simões-Lopes

    2005-11-01

    Full Text Available Santa Catarina Island possesses dozens of archeological sites where the skeletal remains of a great array of animals can be found. The goal of this study was to quantify the skeletal remains of capybaras found at the archeological site SC PRV 02 (1067 to 1735 BP, located in the northern part of the island, along the shores of Lagoa da Conceição, a saltwater lagoon. Thirty-seven skeletal fragments of at least 12 different individuals were identified. The anatomic regions of the capybaras most sought-after by pre-colonial inhabitants were the anterior and posterior limbs. About 40% of the skeletal fragments did not show any epiphyseal fusion with the shaft. Approximately 48% of the fragments found presented evidence of human activity. Our analyses suggest that capybaras played an important role in the diet of these inhabitants and that they were also used for the confection of different functional goods. We diagnosed the manipulation techniques used to obtain these goods, such as percussion and transversal section. The evidence of carbonization and superficial incisions indicates dismembering, preparation, and consumption of capybaras for feeding. Similar techniques were found at other archeological sites of the same age, suggesting that even though pre-colonial inhabitants of the island were considered to be fishermen, capybaras represented a well-appreciated resource.

  15. [Diet of the capybara Hydrochaeris hydrochaeris (Rodentia: Hydrocharidae) in Caño Limón, Arauca, Colombia].

    Science.gov (United States)

    Forero-Montaña, Jimena; Betancur, Julio; Cavelier, Jaime

    2003-06-01

    We studied the composition and seasonal variation of the diet of the capybara (Hydrochaeris hydrochaeris) in the flooded savannas of Caño Limón, Colombia. This was achieved by direct observation of the consumption patterns of these animals. The capybaras only consumed plants, and their diet included 89 species of 22 families. Sixty three percent of these plant species had not been reported before. The most commonly consumed plants (94% of the diet), belonged to the Poaceae, Cyperaceae, Leguminosae and Pontederiaceae. Only seven species represented 60% of the total diet: the grasses Hymenachne amplexicaulis (16.9%), Digitaria bicornis (4.5%) and Panicum maximum (4.4%) and the Cyperaceae Rynchospora corymbosa (4.4%). There was seasonal variation in the diet composition of capybaras.

  16. Redescription of Echinocoleus hydrochoeri (Travassos, 1916) (Nematoda: Trichuridae) from Hydrochoeris hydrochaeris Linnaeus, 1766 (Rodentia: Caviidae) from Argentina.

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    Robles, María del Rosario; Eberhardt, María Ayelen Teresita; Bain, Odile; Beldomenico, Pablo Martín

    2013-08-01

    Twenty-eight Capillariinae species have been recorded in rodents; 1 of these species was reported from a caviomorph rodent, Hydrochoeris hydrochaeris (capybara), and placed in the genus Echinocoleus by Moravec (1982). However, both original description and subsequent contributions of Echinocoleus hydrochoeri are poor and incomplete. In this paper, this species is redescribed, and a new geographical distribution is reported. The redescription is based on morphologic and morphometrical features; intestine ends in a cloaca beside ejaculatory duct, caudal bursa composed of 2 large ventrolateral lobes with a fleshy internal part and a membranous external part (they are not united dorsally with a membrane), 1 pair of caudal papillae, terminal part of cylindrical cirrus ornamented with thin and thick spines (and particular pattern distribution), sclerotized spicule in male, and vulvar appendage in female, and 3 bacillary bands (1 ventral and 2 lateral). Generic and specific analyses were performed to establish new standards for future studies on the systematic position of Capillariinae species. This study presents new morphological information and a new record of a capillariid species from Argentina.

  17. Biometric features of the capybara´s body and small intestine Hydrochoerus hydrochaeris Linnaeus, 1766 (Mammalia, Rodentia, Hydrochaeridae

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    Tarcízio Antônio Rego de Paula

    2006-09-01

    Full Text Available Biometric aspects of the body were analyzed, as well as some aspects of the small intestine of the capybara Hydrochoerus hydrochaeris wild species, particularly those that have been provoking economic interest in meat and leather production. Data such as age, corporal weight and length and thoracic perimeter and height were analyzed. Significant correlations were found between the age and the crown-rump (CR and snout-rump (SR corporal lengths, and between the corporal weight and the parameters of corporal length, thoracic perimeter and height, so that the age and the corporal weight could be obtained starting from more accessible biometric parameters, relative to corporal measurement. Most of the correlations were more significant in the male animals, especially the correlations between the corporal weight and the parameters CR length, thoracic perimeter and height, as well as the correlation among CR length and thoracic height and perimeter, suggesting the existence of possible sexual dimorphism. In relation to the small intestine, estimates were made of the length and volumetric capacity totals as well as those of its individual segments. The capybara possesses a small intestine that is relatively long, about five times longer than the corporal length, and with a volumetric capacity that is relatively high, representing 6.7% of the corporal weight.

  18. Three new karyotypes extend a Robertsonian fan in Ethiopian spiny mice of the genus Acomys I. Geoffroy, 1838 (Mammalia, Rodentia

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    Leonid Lavrenchenko

    2011-12-01

    Full Text Available Three new karyotypes (2n=40, 44, 52 are described revealing what are probably new cryptic species of Ethiopian spiny mice. Two other diploid numbers have already been reported for the country (2n=36 and 68 and, overall, the five known karyotypic forms constitute a common lineage differentiated by a Robertsonian process. Such arrays of karyotypic forms are known as a ‘Robertsonian fan’. This view of the situation in Ethiopian Acomys I. Geoffroy, 1838 is based on standard chromosomal morphology that reveals a constant FN (68 and needs further investigation of chromosome homology by differential staining and/or molecular cytogenetic techniques as well as further molecular phylogenetic analysis.

  19. Three new karyotypes extend a Robertsonian fan in Ethiopian spiny mice of the genus Acomys I. Geoffroy, 1838 (Mammalia, Rodentia).

    Science.gov (United States)

    Lavrenchenko, L A; Nadjafova, R S; Bulatova, N Sh

    2011-01-01

    Three new karyotypes (2n=40, 44, 52) are described revealing what are probably new cryptic species of Ethiopian spiny mice. Two other diploid numbers have already been reported for the country (2n=36 and 68) and, overall, the five known karyotypic forms constitute a common lineage differentiated by a Robertsonian process. Such arrays of karyotypic forms are known as a 'Robertsonian fan'. This view of the situation in Ethiopian Acomys I. Geoffroy, 1838 is based on standard chromosomal morphology that reveals a constant FN (68) and needs further investigation of chromosome homology by differential staining and/or molecular cytogenetic techniques as well as further molecular phylogenetic analysis.

  20. Comparative gastrointestinal morphology of three small mammalian insectivores: Acomys spinosissimus (Rodentia), Crocidura cyanea (Eulipotyphla), and Amblysomus hottentotus (Afrosoricida).

    Science.gov (United States)

    Boonzaier, Julia; Van der Merwe, Elizabeth L; Bennett, Nigel C; Kotzé, Sanet H

    2013-06-01

    The gastrointestinal morphology was investigated in three mammalian insectivorous species, namely Acomys spinosissimus, Crocidura cyanea, and Amblysomus hottentotus. The aim of the study was to provide a comprehensive morphological comparison between the different species and to explore whether anatomical gastrointestinal adaptations are associated with the insectivorous diet of these species. The shape, proportional length, and proportional surface areas of the different gastrointestinal regions were recorded and compared in the three insectivores. Hematoxylin and Eosin (H&E) and Alcian Blue/Periodic Acid Schiff (AB/PAS) were used for morphological assessment. In all three species, the stomach was simple and uncompartmentalized. The internal aspect of the stomach in A. spinosissimus was hemi-glandular, containing stratified squamous epithelium in the fundus, with glandular epithelium in the body and pyloric region. However, C. cyanea and A. hottentotus had wholly glandular stomachs. Paneth cells were not observed in the intestinal tracts of C. cyanea and A. hottentotus. Acomys spinosissimus was the only species studied that had a cecum. The proximal colonic region of A. spinosissimus had V-shaped mucosal folds. Histologically, C. cyanea had villi throughout the entire gastrointestinal tract (GIT), whereas for A. hottentotus villi were not present in the most distal gastrointestinal regions. In both C. cyanea and A. hottentotus, longitudinal mucosal folds were present in the distal part of the colon. The GITs of C. cyanea and A. hottentotus showed little morphological differentiation namely, a simple, glandular stomach and the lack of a cecum.

  1. Cytochrome b sequences reveal Acomys minous (Rodentia, Muridae) paraphyly and answer the question about the ancestral karyotype of Acomys dimidiatus.

    Science.gov (United States)

    Barome, P O; Lymberakis, P; Monnerot, M; Gautun, J C

    2001-01-01

    Sequences of the cytochrome b (cyt b) mitochondrial gene show that the spiny mouse Acomys from Crete, known as the endemic species A. minous, is composed of two distinct maternal lineages ("A" and "B"). Group "A" sequences cluster with A. nesiotes (Cyprus) and group "B" sequences cluster with A. cilicicus (Turkey), which is evidence of paraphyly of A. minous in regard to these two species. From cyt b sequences, the three taxa are very closely related to A. cahirinus (Egypt): the maximum divergence found among these sequences is 1.6%, which is equivalent to the intraspecific diversity observed in other Acomys species. Paleozoology evidenced that man unintentionally introduced Acomys into Crete and Cyprus during antiquity. The divergence time between Acomys cyt b sequences found in Crete was estimated at 0.4 Myr, which means that the diversity observed did not appear after the introduction but reflects a much more ancient polymorphism. Cytochrome b phylogeny and cytogenetic data together comprise evidence that, within the species A. dimidiatus (Saudi Arabia, Israel, Egypt), it is the karyotypic form with 36 chromosomes that derives from the form with 38 chromosomes, due to a single acrocentric fusion.

  2. On cognitive ecology and the environmental factors that promote Alzheimer disease: lessons from Octodon degus (Rodentia: Octodontidae).

    Science.gov (United States)

    Rivera, Daniela S; Inestrosa, Nibaldo C; Bozinovic, Francisco

    2016-02-20

    Cognitive ecologist posits that the more efficiently an animal uses information from the biotic and abiotic environment, the more adaptive are its cognitive abilities. Nevertheless, this approach does not test for natural neurodegenerative processes under field or experimental conditions, which may recover animals information processing and decision making and may explain, mechanistically, maladaptive behaviors. Here, we call for integrative approaches to explain the relationship between ultimate and proximate mechanisms behind social behavior. We highlight the importance of using the endemic caviomorph rodent Octodon degus as a valuable natural model for mechanistic studies of social behavior and to explain how physical environments can shape social experiences that might influence impaired cognitive abilities and the onset and progression of neurodegenerative disorders such as Alzheimer disease. We consequently suggest neuroecological approaches to examine how key elements of the environment may affect neural and cognitive mechanisms associated with learning, memory processes and brain structures involved in social behavior. We propose the following three core objectives of a program comprising interdisciplinary research in O. degus, namely: (1) to determine whether diet types provided after weaning can lead to cognitive impairment associated with spatial memory, learning and predisposing to develop Alzheimer disease in younger ages; (2) to examine if early life social experience has long term effects on behavior and cognitive responses and risk for development Alzheimer disease in later life and (3) To determine if an increase of social interactions in adult degu reared in different degree of social stressful conditions alter their behavior and cognitive responses.

  3. On the Origin and Evolution of the Extant System of B Chromosomes in Oryzomyini Radiation (Rodentia, Sigmodontinae).

    Science.gov (United States)

    Ventura, Karen; O'Brien, Patricia Caroline Mary; do Nascimento Moreira, Camila; Yonenaga-Yassuda, Yatiyo; Ferguson-Smith, Malcolm Andrew

    2015-01-01

    Heterogeneous supernumerary chromosomes (Bs) are recognized in the oryzomyines Holochilus brasiliensis, Nectomys rattus, N. squamipes, Oligoryzomys flavescens and Sooretamys angouya, representing about 10% of all known B-containing rodent species. They provide an outstanding model for understanding the origin, evolution and diversity of Bs in a phylogenetic context. Therefore, whole chromosome-specific probes were generated from flow-sorted Holochilus brasiliensis (HBR) autosomes 11 and 25+26 and chromosomes X, Y and Bs. Hybridizations were performed on male metaphases of 15 Oryzomyini species of which 3 are B-containing species. The results reveal that among the species sampled, 12 of them, belonging to a monophyletic Oryzomiyini subclade, are positive for an anonymous Oryzomyini shared heterochromatic region (OSHR) on both sex chromosomes. The OSHR is also present on Bs of Holochilus brasiliensis, Nectomys rattus and N. squamipes but not on Bs of O. flavescens and S. angouya. Two distinct additional OSHR/autosome associations are observed on S. angouya. The three species that are OSHR negative belong to an outgroup. Molecular dating suggests that the OSHR originated between 7.8 and 3 Mya on ancestral sex chromosomes. A tentative explanation for the OSHR-positive nature of B regions in three species could be that transposable elements (TEs) from this specific sex chromosome region may have invaded existing B chromosomes. The presence of the OSHR on entire Xp and Yp adjacent to interstitial telomeric sequences at pericentromeric positions, as observed in Drymoreomys albimaculatus, show a similar organization as on B chromosomes in Nectomys squamipes. The diversity of the Oryzomyini Bs in number, size, morphology and genetic content may be explained by the independent origin of B chromosomes in different subgroups of species, with Bs in Holochilus brasiliensis, Nectomys squamipes and N. rattus sharing the OSHR with sex chromosomes, and those in Oligoryzomys flavescens and Sooretamys angouya lacking OSHR in Bs. The species-specific pattern of Bs is probably a consequence of their independent evolutionary origin.

  4. Paraspidodera uncinata (Nematoda, Lauroiinae as parasite of Cavia magna and Cavia aperea (Rodentia, Caviidae in southern Brazil

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    Ana Gabriela da Silva Rocha

    2015-05-01

    Full Text Available Out of the 5 species of Guinea pig registered for Brazil, 4 (Cavia fulgida, C. porcellus, C. aperea, and C. magna have already been reported as hosts of Paraspidodera uncinata. The rodent species C. magna and C. aperea are small-sized mammals, with terrestrial habits, which occur from southern Brazil to eastern Uruguay. Guinea pig specimens donated for research were necropsied for the analysis of endoparasites, and the nematodes found were identified as P. uncinata. The microhabitats of this species were the small and large intestines in C. magna and the large intestine in C. aperea. The prevalence of P. uncinata in the hosts was 60% in C. magna (n = 5 and 14% in C. aperea (n = 7. The record of P. uncinata in different Guinea pig species allows inferring that the foraging mode is similar in the different locations where they occur in southern Brazil, because, perhaps, the infection of hosts has occurred through the ingestion of vegetables contaminated with P. uncinata eggs. This study contributes to knowledge on the helminth fauna of C. magna and C. aperea in southern Brazil.

  5. A new host of Trypanosoma cruzi from Jujuy, Argentina: octodontomys gliroides (Gervais & D'Orbigny, 1844 (Rodentia, Octodontidae

    Directory of Open Access Journals (Sweden)

    Nicolas J. Schweigmann

    1992-06-01

    Full Text Available To identify wild hosts of Trypanosoma cruzi, surveys were conducted in the subandean valleys of Jujuy Province, Argentina, between June 1986 and March 1987. Seventy two mammals from 13 different species were examined by xenodiagnosis. Fifty two of them were mostly roedents trapped at the localities of Maimará, León and Tilcara, and the remainder had been kept in captivity at the Estación Biológica Experimental, in Jujuy. Trypanosoma cruzi infection was detected only in 2 Octodontomys gliroides (2 pos./8 exam. 25% from all 72 examined mammals. Isolates were called Octodontomys Argentina 1 and 2 (OA1 and OA2. Both infected animals were caught at the archaelogical ruin of Pucará, at Tilcara. Repeated searches for triatomines in the ruin itself and in neighbour houses rendered negative results. Groups of mice inoculated with either OA1 or OA2 isolates became infected between 7 (OA1 to 12 days (OA2 postinoculation PI. Parasitemia peaks were observed between day 12th - 14th PI. Scarce amastigote nests were found in myocardium and skeletal muscle. Mortality was observed only for mice inoculated with OA1. Isoenzyme patterns of OA1 and OA2 were identical to one found in dogs and slightly different from that of human parasites in Argentina. Bones from Octodontomys sp., were recently found in a cave, dated 10200-8600 BC, in Pumamarca, near Tilcara, Jujuy. There are evidences that O. gliroides cohabited with man in ancient times and was associated to the domestic cycle of T. cruzi transmission, playing a role like that of domestic cavies. in Bolivia.

  6. Thrichomys laurentius (Rodentia; Echimyidae as a putative reservoir of Leishmania infantum and L. braziliensis: patterns of experimental infection.

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    André Luiz Rodrigues Roque

    Full Text Available The importance of the genus Thrichomys in the retention of infection and transmission of Leishmania species is supported by previous studies that describe an ancient interaction between caviomorphs and trypanosomatids and report the natural infection of Thrichomys spp. Moreover, these rodents are widely dispersed in Brazil and recognized as important hosts of other tripanosomatids. Our main purpose was to evaluate the putative role of Thrichomys laurentius in the retention of infection and amplification of the transmission cycle of Leishmania infantum and L. braziliensis. Male and female T. laurentius (n = 24 born in captivity were evaluated for the retention of infection with these Leishmania species and followed up by parasitological, serological, hematological, biochemical, histological, and molecular assays for 3, 6, 9, or 12 months post infection (mpi. T. laurentius showed its competence as maintenance host for the two inoculated Leishmania species. Four aspects should be highlighted: (i re-isolation of parasites 12 mpi; (ii the low parasitic burden displayed by T. laurentius tissues; (iii the early onset and maintenance of humoral response, and (iv the similar pattern of infection by the two Leishmania species. Both Leishmania species demonstrated the ability to invade and maintain itself in viscera and skin of T. laurentius, and no rodent displayed any lesion, histological changes, or clinical evidence of infection. We also wish to point out the irrelevance of the adjective dermotropic or viscerotropic to qualify L. braziliensis and L. infantum, respectively, when these species are hosted by nonhuman hosts. Our data suggest that T. laurentius may act at least as a maintenance host of both tested Leishmania species since it maintained long-lasting infections. Moreover, it cannot be discarded that Leishmania spp. infection in free-ranging T. laurentius could result in higher parasite burden due the more stressing conditions in the wild. Therefore the tissular parasitism of the skin, infectiveness to the vector, and amplification of the transmission cycle of both Leishmania species could be expected.

  7. Evolutionary and Biological Implications of Dental Mesial Drift in Rodents: The Case of the Ctenodactylidae (Rodentia, Mammalia)

    Science.gov (United States)

    Gomes Rodrigues, Helder; Solé, Floréal; Charles, Cyril; Tafforeau, Paul; Vianey-Liaud, Monique; Viriot, Laurent

    2012-01-01

    Dental characters are importantly used for reconstructing the evolutionary history of mammals, because teeth represent the most abundant material available for the fossil species. However, the characteristics of dental renewal are presently poorly used, probably because dental formulae are frequently not properly established, whereas they could be of high interest for evolutionary and developmental issues. One of the oldest rodent families, the Ctenodactylidae, is intriguing in having longstanding disputed dental formulae. Here, we investigated 70 skulls among all extant ctenodactylid genera (Ctenodactylus, Felovia, Massoutiera and Pectinator) by using X-ray conventional and synchrotron microtomography in order to solve and discuss these dental issues. Our study clearly indicates that Massoutiera, Felovia and Ctenodactylus differ from Pectinator not only by a more derived dentition, but also by a more derived eruptive sequence. In addition to molars, their dentition only includes the fourth deciduous premolars, and no longer bears permanent premolars, conversely to Pectinator. Moreover, we found that these premolars are lost during adulthood, because of mesial drift of molars. Mesial drift is a striking mechanism involving migration of teeth allowed by both bone remodeling and dental resorption. This dental innovation is to date poorly known in rodents, since it is only the second report described. Interestingly, we noted that dental drift in rodents is always associated with high-crowned teeth favoring molar size enlargement. It can thus represent another adaptation to withstand high wear, inasmuch as these rodents inhabit desert environments where dust is abundant. A more accurate study of mesial drift in rodents would be very promising from evolutionary, biological and orthodontic points of view. PMID:23185576

  8. Evolutionary and biological implications of dental mesial drift in rodents: the case of the Ctenodactylidae (Rodentia, Mammalia.

    Directory of Open Access Journals (Sweden)

    Helder Gomes Rodrigues

    Full Text Available Dental characters are importantly used for reconstructing the evolutionary history of mammals, because teeth represent the most abundant material available for the fossil species. However, the characteristics of dental renewal are presently poorly used, probably because dental formulae are frequently not properly established, whereas they could be of high interest for evolutionary and developmental issues. One of the oldest rodent families, the Ctenodactylidae, is intriguing in having longstanding disputed dental formulae. Here, we investigated 70 skulls among all extant ctenodactylid genera (Ctenodactylus, Felovia, Massoutiera and Pectinator by using X-ray conventional and synchrotron microtomography in order to solve and discuss these dental issues. Our study clearly indicates that Massoutiera, Felovia and Ctenodactylus differ from Pectinator not only by a more derived dentition, but also by a more derived eruptive sequence. In addition to molars, their dentition only includes the fourth deciduous premolars, and no longer bears permanent premolars, conversely to Pectinator. Moreover, we found that these premolars are lost during adulthood, because of mesial drift of molars. Mesial drift is a striking mechanism involving migration of teeth allowed by both bone remodeling and dental resorption. This dental innovation is to date poorly known in rodents, since it is only the second report described. Interestingly, we noted that dental drift in rodents is always associated with high-crowned teeth favoring molar size enlargement. It can thus represent another adaptation to withstand high wear, inasmuch as these rodents inhabit desert environments where dust is abundant. A more accurate study of mesial drift in rodents would be very promising from evolutionary, biological and orthodontic points of view.

  9. In the wake of invasion: tracing the historical biogeography of the South American cricetid radiation (Rodentia, Sigmodontinae.

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    Rafael N Leite

    Full Text Available The Great American Biotic Interchange (GABI was greatly influenced by the completion of the Isthmus of Panama and impacted the composition of modern faunal assemblages in the Americas. However, the contribution of preceding events has been comparatively less explored, even though early immigrants in the fossil records are evidence for waif dispersals. The cricetid rodents of the subfamily Sigmodontinae are a classic example of a species-rich South American radiation resulting from an early episode of North American invasion. Here, we provide a temporal and spatial framework to address key aspects of the historical biogeography and diversification of this diverse mammal group by using mitochondrial and nuclear DNA datasets coupled with methods of divergence time estimation, ancestral area reconstruction and comparative phylogenetics. Relaxed-clock time estimates indicate that divergence of the Sigmodontinae began in the middle-late Miocene (ca. 12-9 Ma. Dispersal-vicariance analyses point to the arrival of a single lineage of northern invaders with a widespread ancestral distribution and imply that the initial differentiation between Central and South America gave rise to the most basal groups within the subfamily. These two major clades diversified in the late Miocene followed by the radiation of main tribes until the early Pliocene. Within the Oryzomyalia, tribes diverged initially in eastern South America whereas multiple dispersals into the Andes promoted further diversification of the majority of modern genera. A comparatively uniform background tempo of diversification explains the species richness of sigmodontines across most nodes, except for two akodontine genera with recent increases in diversification rates. The bridging of the Central American seaway and episodes of low sea levels likely facilitated the invasion of South America long before the onset of the post-Isthmian phase of the GABI.

  10. In the Wake of Invasion: Tracing the Historical Biogeography of the South American Cricetid Radiation (Rodentia, Sigmodontinae)

    OpenAIRE

    Leite, Rafael N; Sergios-Orestis Kolokotronis; Francisca C Almeida; Werneck, Fernanda P.; Duke S Rogers; Marcelo Weksler

    2014-01-01

    The Great American Biotic Interchange (GABI) was greatly influenced by the completion of the Isthmus of Panama and impacted the composition of modern faunal assemblages in the Americas. However, the contribution of preceding events has been comparatively less explored, even though early immigrants in the fossil records are evidence for waif dispersals. The cricetid rodents of the subfamily Sigmodontinae are a classic example of a species-rich South American radiation resulting from an early e...

  11. In the wake of invasion: tracing the historical biogeography of the South American cricetid radiation (Rodentia, Sigmodontinae).

    Science.gov (United States)

    Leite, Rafael N; Kolokotronis, Sergios-Orestis; Almeida, Francisca C; Werneck, Fernanda P; Rogers, Duke S; Weksler, Marcelo

    2014-01-01

    The Great American Biotic Interchange (GABI) was greatly influenced by the completion of the Isthmus of Panama and impacted the composition of modern faunal assemblages in the Americas. However, the contribution of preceding events has been comparatively less explored, even though early immigrants in the fossil records are evidence for waif dispersals. The cricetid rodents of the subfamily Sigmodontinae are a classic example of a species-rich South American radiation resulting from an early episode of North American invasion. Here, we provide a temporal and spatial framework to address key aspects of the historical biogeography and diversification of this diverse mammal group by using mitochondrial and nuclear DNA datasets coupled with methods of divergence time estimation, ancestral area reconstruction and comparative phylogenetics. Relaxed-clock time estimates indicate that divergence of the Sigmodontinae began in the middle-late Miocene (ca. 12-9 Ma). Dispersal-vicariance analyses point to the arrival of a single lineage of northern invaders with a widespread ancestral distribution and imply that the initial differentiation between Central and South America gave rise to the most basal groups within the subfamily. These two major clades diversified in the late Miocene followed by the radiation of main tribes until the early Pliocene. Within the Oryzomyalia, tribes diverged initially in eastern South America whereas multiple dispersals into the Andes promoted further diversification of the majority of modern genera. A comparatively uniform background tempo of diversification explains the species richness of sigmodontines across most nodes, except for two akodontine genera with recent increases in diversification rates. The bridging of the Central American seaway and episodes of low sea levels likely facilitated the invasion of South America long before the onset of the post-Isthmian phase of the GABI.

  12. Dietary selection in Mastomys natalensis (Rodentia: Muridae) in the maize agro-ecosystems of central and southwestern Tanzania

    DEFF Research Database (Denmark)

    Odhiambo, Richard O; Makundi, Rhodes H; Leirs, Herwig;

    2008-01-01

    We studied the feeding habits of Mastomys natalensis by analysing a total of 2934 stomachs from individuals snap trapped from maize fields and the surrounding fallow land of central and southwestern Tanzania between February 2001 and October 2002. Mastomys natalensis had a wide range of food item...

  13. Leishmania mexicana in Proechimys iheringi denigratus Moojen (Rodentia, Echimyidae in a region endemic for American cutaneous leishmaniasis

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    Air C. Barretto

    1985-12-01

    Full Text Available Three isolates of Leishmania were recovered from five of 27 specimens of the rodent Proechimys iheringi denigratus Moojen captured near Três Braços in the Atlantic Forest region of Bahia, Brazil. Two of these isolates were recovered from hamsters inoculated with a pooled triturate of liver, spleen and skin tissue from apparently healthy P. i. denigratus. The third isolate was recovered from a triturate of only skin tissue from another. Metastasis was observed in the inoculated hamsters, the parasites grew abundantly in artificial media and a typical suprapylarial pattern of infection in Lutzomyia longipalpis was produced indicating that the parasites belong to the Leishmania mexicana complex. All isolates reacted with Leishmania mexicana mexicana and Leishmania mexicana amazonensis monoclonal antibodies. The isoenzyme analysis differentiated these isolates from standard isolates of L. m. mexicana, L. m. amazonensis, L. m. aristedesi, L. m. pifanoi, L. m. garnhami and L. m. ssp.(Goiás-W. Barbosa. These isolates seem to be a subspecies of L. mexicana very closely related to L. m. amazonensis from which they differ by decreased electrophoretic mobility of GPI, PEP and ALAT. This is the first record of the isolation of a parasite of thegenus Leishmania in a rodent captured in the State of Bahia.Três isolados de Leishmania foram obtidos de cinco entre 27 exemplares do roedor Proechimys iheringi denigratus, capturados na região de Três Braços, na mata atlântica do Estado da Bahia, Brasil. O isolamento desse parasito foi feito através de inoculação de triturado de pele, baço e fígado em patas de hamsters. Em pelo menos um dos casos, (MTB-574, o parasito foi isolado da pele. Metas- tase foi observada nos hamsters inoculados, os parasitos cresceram abundantemente em meios artificiais de cultura e um padrão suprapapilario típico foi obtido em Lutzomyia longipalpis, indicando que o parasito pertence ao complexo L. mexicana. Todos os isolados reagiram positivamente com anticorpos monoclonais de L. m. mexicana e L. m. amazonensis. A análise isoenzimática diferenciou o parasito de isolados padrões de L. m. mexicana. L. m. amazonensis. L. m. aristedesi. L. m. pifanoi. L. m. garnhami e L. m. ssp(Goiás-W. Barbosa. O parasito parece ser uma subespécie de L. mexicana muito próxima à L. m. amazonensis, da qual difere pela menor mobilidade eletroforêtica de GPI, PEP e ALAT. Este e o primeiro registro do isolamento de um parasito do gênero Leishmania em um roedor capturado no Estado da Bahia.

  14. Glirinae (Gliridae, Rodentia) from the type area of the Aragonian and adjacent areas (provinces of Teruel and Zaragoza, Spain)

    NARCIS (Netherlands)

    Daams, R.

    1985-01-01

    This paper, the first in a series of monographs on the mammal faunas from the type area of the Aragonian and adjacent areas in the provinces of Teruel and Zaragoza, deals with the description and palaeoenvironmental interpretation of the Glirinae (Gliridae: dormice).

  15. PATRONES DE REPLICACIÓN Y BANDEO NO DIFERENCIAL EN ARDILLAS COLOMBIANAS DEL GÉNERO SCIURUS (RODENTIA, SCIURIDAE

    Directory of Open Access Journals (Sweden)

    Bueno Marta Lucia

    2012-08-01

    Full Text Available Las ardillas colombianas muestran una gran variabilidad citogenética lo que ha despertado el interés en ahondar aspectos evolutivos en el grupo. Para esto varias herramientas de bandeo cromosómico deben ser analizadas con detenimiento en complemento con la técnica clásica de bandeo G. Estas técnicas incluyen otras bandas diferenciales como la banda Q y R y bandas no diferenciales tipo banda C y NOR. Se explica la utilidad de cada uno de estos complementos en el análisis citogenético de especies y las observaciones para los citotipos de las ardillas colombianas.

  16. A taxonomic revision of the Pleistocene Hystrix (Hystricidae, Rodentia) from Eurasia with notes on the evolution of the family

    NARCIS (Netherlands)

    Weers, van D.J.

    2005-01-01

    Measurements of many hundreds of the high-crowned cheek teeth of Hystrix specimens from the Euro-Asiatic Pleistocene in the collections of European and Asiatic institutions have been compared with extant species for a revision of the genus. A review is given about the extant genera and species of th

  17. Aepyosciurinae -- a new subfamily of Sciuridae (Rodentia, Mammalia) from basal loess deposits at the northeastern border of Tibetan Plateau

    Institute of Scientific and Technical Information of China (English)

    2003-01-01

    Aepyosciurinae, a new subfamily of Sciuridae, were found at the base of the early Pleistocene loess deposits in Dongxiang County, Gansu Province. Its unilaterally hypsodont and lophodont cheek teeth are unique among the sciurids so far known all over the world. Certain degree of similarity can be observed between the cheek teeth of the new subfamily and the Anomalurinae living in tropical and subtropical forests in central and western Africa. Aepyosciuris orientalis gen. et sp. nov. might have lived in montaneous woodland or grassland and lived on harder leaves, barks, or even grass. This tends to show that the northeastern border area of the Tibetan Plateau had been lifted considerably high in early Pleistocene (ca. 2 Ma), with drier climate, becoming a suitable habitat for Aepyosciurus orientalis.

  18. Potential distribution and new records of Trinomys species (Rodentia: Echimyidae in the state of Rio de Janeiro

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    Nina Attias

    2009-06-01

    Full Text Available The spiny rats of the genus Trinomys Thomas, 1921 have a broad distribution in the Atlantic Forests of southeastern Brazil. However, some species are known only from their type locality and adjacent areas. In our study, nine areas in the state of Rio de Janeiro were surveyed and three species of the genus were captured - Trinomys dimidiatus (Günther, 1877, T. setosus (Desmarest, 1817 and T. gratiosus bonafidei (MOOJEN, 1948. We extended the distribution of T. gratiosus bonafidei in 100 km, in a straight line to the northwest, and into an area of Semidecidual Seasonal Forest. We captured T. setosus, which had not been previously recorded in the state, in the municipality of Cambuci, extending its distribution 150 km, in a straight line to the east of its closest record, in Juiz de Fora, state of Minas Gerais. The state of Rio de Janeiro has now six recognized species of Trinomys, however none of them were collected above 1300 m of altitude. We used occurrence points provided by our inventories data and from the literature to model the potential distribution of Trinomys species. We used climatic, topographic and phytogeographic variables to prepare the potential distribution maps. The algorithm used for modeling was provided by the software Maxent, version 3.2.1. Although species boundaries within Trinomys in Rio de Janeiro State are not yet clear, their distributions seem to be parapatric, except for T. iheringi and T. dimidiatus.

  19. Changes on Schistosoma mansoni (Digenea: Schistosomatidae worm load in Nectomys squamipes (Rodentia: Sigmodontinae concurrently infected with Echinostoma paraensei (Digenea: Echinostomatidae

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    Arnaldo Maldonado Júnior

    2001-09-01

    Full Text Available The water rat, Nectomys squamipes, closely involved in schistosomiasis transmission in Brazil, has been found naturally infected simultaneously by Schistosoma mansoni and Echinostoma paraensei. Laboratory experiments were conducted to verify parasitic interaction in concurrent infection. It was replicated four times with a total of 42 water rats and essayed two times with 90 mice pre-infected with E. paraensei. Rodents were divided into three groups in each replication. A wild strain recently isolated from Sumidouro, RJ, and a laboratory strain of S. mansoni from Belo Horizonte (BH was used. Rats infected with E. paraensei were challenged 4 weeks later with S. mansoni and mice 2 or 6 weeks after the infection with S. mansoni. Necropsy took place 8 weeks following S. mansoni infection. The N. squamipes treatment groups challenged with S. mansoni RJ strain showed a significant decrease (80 and 65% in the S. mansoni parasite load when compared with their respective control groups. There was a significant change or no change in the hosts challenged with the BH strain. The persistence time of E. paraensei within host was extended in relation to control groups, with a consequent enhancement of the number of recovered worm. An E. paraensei strain-specific influence on S. mansoni parasitism is reported. This paper presents some experimental data about this interaction in N. squamipes and Mus musculus.

  20. El aparato masticador del género extinto Actenomys Burmeister, 1888 (Rodentia, Ctenomyidae: inferencias sobre su modo de vida

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    Moreira, G. J.

    2000-04-01

    Full Text Available The genus Actenomys is registered from Plioceno sediments of Buenos Aires province, Argentina. Anatomy of skull and dentition of the genus is described, giving special emphasis to the origin and insertion points of the masticatory musculature. Actenomys is compared with the extant fossorial rodent of the genus Ctenomys, and the development of the masticatory muscles and their degree of functionality are inferred. It is concluded that Actenomys presents a less robust skull, with a masticatory musculature in agreement and incisives with great procumbency. This evidence could explain a possible adaptation of Actenomys to dig using the incisives and an adaptation to live in habitats of higher humidity than the extant forms.Se describe la anatomía cráneo-dentaria del género Actenomys, registrado en sedimentos del Plioceno de la provincia de Buenos Aires (República Argentina, con especial énfasis los puntos de origen e inserción de la musculatura masticatoria; se lo compara con el roedor fosorial viviente del género Ctenomys, infiriéndose el desarrollo de los músculos masticatorios y su grado de funcionalidad. Se concluye que Actenomys presenta un cráneo menos robusto, con una musculatura masticatoria acorde e incisivos procumbentes, lo que podría explicar una posible adaptación para cavar con los mismos, y que estaría adaptado a vivir en ambientes con un porcentaje de humedad mayor que las formas actuales.

  1. Teasing apart socially-induced infertility in non-reproductive female Damaraland mole-rats, Fukomys damarensis (Rodentia: Bathyergidae).

    Science.gov (United States)

    Bennett, Nigel C

    2011-12-01

    The Damaraland mole-rat is a subterranean mammal exhibiting extreme reproductive skew with a single reproductive female in each colony responsible for procreation. Non-reproductive female colony members are physiologically suppressed while in the colony, exhibiting reduced concentrations of plasma luteinizing hormone (LH) and a decreased response of the pituitary, as measured by the release of bioactive LH, to an exogenous dose of gonadotrophin releasing hormone (GnRH). Removal of the reproductive female from the colony results in an elevation of LH and an enhanced response of the pituitary to a GnRH challenge in non-reproductive females comparable to reproductive females, implying control of reproduction in these individuals by the reproductive female. The Damaraland mole-rat is an ideal model for investigating the physiological and behavioral mechanisms that regulate the hypothalamo-pituitary-gonadal axis. In contrast, we know less about the control of reproduction at the level of the hypothalamus. The immunohistochemistry of the GnRH system of both reproductive and non-reproductive female Damaraland mole-rats has revealed no significant differences with respect to morphology, distribution or numbers of immunoreactive GnRH perikarya. We examined whether the endogenous opioid peptide beta-endorphin was responsible for the inhibition of the release of the GnRH from the neurons indirectly by measuring LH concentrations in these non-reproductive females following single, hourly and 8 hourly injections of the opioid antagonist naloxone. The results imply that the endogenous opioid peptide, beta-endorphin, is not responsible for the inhibition of GnRH release from the perikarya in non-reproductive females. Preliminary data examining the circulating levels of cortisol also do not support a role for circulating glucocorticoids. The possible role of kisspeptin is discussed.

  2. Behavior and foraging technique of the Ingram's squirrel Guerlinguetus ingrami (Sciuridae: Rodentia in an Araucaria moist forest fragment

    Directory of Open Access Journals (Sweden)

    Calebe Pereira Mendes

    2014-06-01

    Full Text Available This work describes the foraging techniques, body positions and behavior of free-ranging Ingram's squirrel Guerlinguetus ingrami Thomas, 1901 in a region of the Araucaria moist forest, in the Atlantic Forest of southern Brazil. The animals were observed using the "all occurrence sampling" method with the aid of binoculars and a digital camcorder. All behaviors were described in diagrams and an ethogram. We recorded five basic body positions, 24 behaviors, two food choices, and three feeding strategies utilized to open fruits of Syagrus romanzoffiana (Cham., the main food source of Ingram's squirrels. We also observed a variance in the animals' stance, which is possibly influenced by predation risk, and discuss the causes of some behaviors.

  3. Syphacia obvelata (Nematode, Oxyuridae) infecting laboratory mice Mus musculus (Rodentia, Muridae): phylogeny and host-parasite relationship.

    Science.gov (United States)

    Abdel-Gaber, Rewaida

    2016-03-01

    Syphacia obvelata is a pinworm nematode parasite infecting man and laboratory animals in high abundance. This parasitological study was carried out during the period of March 2014-February 2015 to investigate the helminth parasites infecting the laboratory mice Mus musculus in the Animal House at Cairo University, Egypt. The prevalence of S. obvelata in M. musculus was 75.0 %. The extent of infection with S. obvelata is analyzed according to the sex of the host mice. It was shown that the prevalence of male infection was greater than female worms. Morphological characterization revealed that the present Oxyurid species possesses a rounded cephalic end with less developed lips, esophagus divided into cylindrical corpus, and globular bulb supported internally with valvular apparatus; three mamelons are located at the ventral surface with a single chitinized spicule and a gubernaculum provided with an accessory hook in males, and ovijector apparatus opens ventrally by the vulva surrounded by protruded lips in female worms. Body of the male was 0.623-1.130 (0.830 ± 0.11) mm long and 0.092-0.130 (0.110 ± 0.01) mm wide; the esophagus was 0.164-0.280 (0.210 ± 0.01) mm long; the nerve ring and excretory pore are located at 0.035-0.132 (0.073 ± 0.01) and 0.087-0.191 (0.145 ± 0.01) mm from the anterior end, respectively, while the female measured 2.930-4.650 (3.540 ± 0.1) mm long and 0.120-0.232 (0.156 ± 0.001) mm wide; the esophagus was 0.213-0.410 (0.342 ± 0.01) mm long; the nerve ring, excretory pore, and vulval opening are located at 0.026-0.157 (0.121 ± 0.01), 0.134-0.243 (0.195 ± 0.01), and 0.323-0.632 (0.546 ± 0.11) mm from the anterior end, respectively; eggs measured 0.120-0.139 (0.129 ± 0.001) mm long and 0.030-0.052 (0.045 ± 0.001) mm wide. It compared morphometrically with other Syphacia species described previously and showed little differences in measurements. Molecular characterization based on small subunit ribosomal DNA (rDNA) was done to confirm the obtained morphological and morphometric results. A preliminary genetic comparison between SSU rDNA of the present parasite and other species of Oxyuridae places it as a putative sister taxon to other S. obvelata.

  4. Descriptive morphometry and stereology of the tubular compartment in the wild rodent Hylaeamys megacephalus (Rodentia: Cricetidae) from Central Brazil.

    Science.gov (United States)

    de Melo, Fabiana Cristina Silveira Alves; de Sousa, Tatiane Pires; Costa, Kyvia Lugate C; da Matta, Sérgio Luis P; de Melo, Fabiano Rodrigues; Santa-Rita, Ricardo de Mattos

    2013-04-01

    Information on reproductive characteristics of wild rodents is scarce in the literature. This study aimed to assess the testis morphometry and stereology of Hylaeamys megacephalus. We used five animals in the study, captured in forest fragments in southwestern Goias State, between April and August 2009. The testes were fixed in Karnovsky solution, dehydrated, and embedded in methacrylate. Two-micrometer-thick sections from each sample were stained with toluidine blue/sodium borate 1%. Images of the testicular parenchyma were obtained from photomicroscope and morphometric and stereological analyses were carried out using the Image Pro-Plus software. The average body weight observed in the specimens of H. megacephalus in the study was 47.84 g, of which, 0.40% is allocated to the gonads (GSI) and 0.36% to the seminiferous tubules (TSI). These parameters suggest promiscuous reproductive behavior, of the polyandrous type, favoring males with higher sperm production and consequently, larger testes. The volume density of the seminiferous tubules was 94.46%, which represented a volume of 0.18 mL. The volume density and volume of the interstitium were 5.54% and 0.011 mL, respectively. The diameter of the seminiferous tubules was 206.5 μm and the height of seminiferous epithelium was 71.27 μm. H. megacephalus presents 5.06 m of seminiferous tubules and an average of 27.96 m of seminiferous tubules per gram of testis. The mitotic and meiotic indexes showed losses of 85 and 42%, respectively and an overall loss of 90% over the full spermatogenic process. The number of Sertoli cells per testis and per gram of testis was 7.8×10(6) and 95.28×10(6), respectively. Most of the morphometric parameters evaluated in H. megacephalus in this study are within the range of values described for most mammals.

  5. A new genus of aplodontid rodent (Mammalia, Rodentia) from the late Oligocene of northern Junggar Basin, China.

    Science.gov (United States)

    Bi, Shundong; Meng, Jin; McLean, Sarah; Wu, Wenyu; Ni, Xijun; Ye, Jie

    2013-01-01

    A new genus and species of aplodontid rodent, Proansomys dureensis, from the late Oligocene of the northern Junggar Basin of China is described. The new genus is referred to as Ansomyinae because the ectoloph on the upper cheek teeth, although not fully crested, has attained the same characteristic bucket-handle-shaped configuration as other members of the subfamily. It represents the earliest record of the subfamily yet discovered in Asia and is more plesiomorphic than species of the genus Ansomys in having a partly crested ectoloph, a lower degree of lophodonty, and less complex tooth basins (lacking accessory lophules). Proansomys has transitional features between Prosciurus and Ansomys, suggesting that the Ansomyinae derived from a group of aplodontids related to Prosciurus, as did other advanced aplodontid rodents. This provides new light on the paleobiogeography of the Ansomyinae.

  6. Establishment of Orientia tsutsugamushi Lc-1 (Rickettsiales: Rickettsiaceae) infection in ICR outbred mice (Rodentia: Muridae) by needle challenge.

    Science.gov (United States)

    Lurchachaiwong, Woradee; Chan, Teik-Chye; Richards, Allen L; McCardle, Wesley; Schuster, Anthony L

    2014-05-01

    Orientia tsutsugamushi is a pathogen transmitted by Leptotrombidium that causes scrub typhus. To develop an infection mouse model, a mite-derived isolate of O. tsutsugamushi was established from a laboratory-maintained colony of Leptotrombidium chiangraiensis (O. tsutsugamushi Lc-1). This Lc-1 isolate was initially presented to ICR (CD-1) mice by feeding an infected Lc chigger on the ear of a mouse. Once the Lc-1 was adapted to the ICR mice, quantitative real-time polymerase chain reaction was used to investigate O. tsutsugamushi genomic equivalent copies in tissues and sera. Furthermore, times to onset of the signs of infection are reported in this study. This study provides information useful for future research on this host-pathogen interaction and the associated vaccine efficacy trials.

  7. Karyotype reorganisation in the subtilis group of birch mice (Rodentia, Dipodidae, Sicista): unexpected taxonomic diversity within a limited distribution.

    Science.gov (United States)

    Kovalskaya, Y M; Aniskin, V M; Bogomolov, P L; Surov, A V; Tikhonov, I A; Tikhonova, G N; Robinson, T J; Volobouev, V T

    2011-01-01

    Conventional cytogenetic studies of Sicista subtilis and S. severtzovi (Dipodidae, Sicistinae), both attributable to the subtilis group of birch mice, revealed extensive karyotype diversity with 2n = 16-26 and NFa values of 26-46 indicating the overwhelming non-Robertsonian nature of chromosomal reorganization in these species. The numerical and structural chromosome variability was principally found in specimens located within a confined region of the East European (Russian) Plain. The approximately 135,000-km(2) area occurs in the vicinity of the Don River bend between 49°13'N/43°46'E and 51°32'N/36°16'E. The detection of cytotypes sharing similar 2n and NF values, but having morphologically distinct chromosomes, suggests that these may result from polymorphisms present both within recognized species and in cryptic taxa not hitherto described. We conducted a comprehensive, comparative chromosome banding analysis of 52 birch mice (21 localities) referable to the subtilis group and report the presence of 5 distinct karyotypes, each characterized by a combination of stable, variable, and partly overlapping 2n/NFa values. These karyotypes differed from each other by 10-29 structural chromosomal rearrangements (18.1 ± 6.3) that comprised Rb fusions/fissions (42.2%), pericentric inversions (31.1%), and tandem translocations (22.2%). The composition, and the high numbers of these chromosomal changes, is likely to provide an effective means of post-mating isolation, suggesting that taxonomic diversity within the subtilis group is larger than currently accepted. Additionally, we report the frequent fixation of tandem translocations in sample populations, one of which was found in a polymorphic state representing, as far as we are aware, the first case of an in statu nascendi tandem fusion in wild populations. Moreover, our data revealed that bi-armed chromosomes were involved in fusions detected in some of the subtilis taxa. In each instance, however, fusions were preceded by pericentric inversions that transform one or both bi-armed chromosomes into acrocentrics resulting in either centromere-telomere or Robertsonian translocations. Finally, a phylogenetic scenario inferred from a cladistic analysis of the chromosomal data suggests that the extensive karyotypic diversification within the subtilis group in the south-east region of the Russian Plain most likely results from fragmentation of a continuously distributed, ancestral population. It is thought that this occurred at the last glacial maximum (18,000-14,000 years B.P.), and that the process of isolation has been exacerbated by increasing human activity in the region in modern times.

  8. Karyotype diversity suggests that Laonastes aenigmamus (Laotian rock rat) (Rodentia, Diatomyidae) is a multi-specific genus.

    Science.gov (United States)

    Richard, Florence; Gerbault-Seureau, Michèle; Douangboupha, Bounneuang; Keovichit, Kham; Hugot, Jean-Pierre; Dutrillaux, Bernard

    2016-09-01

    Laonastes aenigmamus (Khanyou) is a recently described rodent species living in geographically separated limestone formations of the Khammuan Province in Lao PDR. Chromosomes of 21 specimens of L. aenigmamus were studied using chromosome banding as well as fluorescent in situ hybridization (FISH) techniques using human painting, telomere repeats, and 28S rDNA probes. Four different karyotypes were established. Study with human chromosome paints and FISH revealed that four large chromosomes were formed by multiple common tandem fusions, with persistence of some interstitial telomeres. The rearrangements separating the different karyotypes (I to IV) were also reconstructed. Various combinations of Robertsonian translocations or tandem fusions involving the same chromosomes differentiate these karyotypes. These rearrangements create a strong gametic barrier, which isolates specimens with karyotype II from the others. C-banding and FISH with telomere repeats also exhibit large and systematized differences between karyotype II and others. These data indicate an ancient reproductive separation and suggest that Laonastes is not a mono-specific genus.

  9. Trypanosoma cruzi: distinct patterns of infection in the sibling caviomorph rodent species Thrichomys apereoides laurentius and Thrichomys pachyurus (Rodentia, Echimyidae).

    Science.gov (United States)

    Roque, André Luiz Rodrigues; D'Andrea, Paulo Sérgio; de Andrade, Gisele Braziliano; Jansen, Ana Maria

    2005-09-01

    Thrichomys apereoides, a caviomorph rodent species common in a highly endemic area for Chagas disease in Brazil, may act as reservoir of the parasite. However, no information is available concerning its sibling species Thrichomys pachyurus, found in the Pantanal region, where Trypanosoma cruzi is found only in the enzootic cycle. We followed up the cross infection of these cryptic species with two isolates derived from naturally infected T. pachyurus and Thrichomys apereoides laurentius. No regional co-adaptation between Thrichomys species and the regional isolates were noticed. However, significant differences in the outcome of the infection were observed. T. a. laurentius was more resistant than T. pachyurus, as expressed by lower parasitemia and less histopathological damage. The routine biochemical markers used for laboratory rodents were unsuitable for follow up of infection in Thrichomys spp, since they did not correlate with the histopathological findings or allowed the kinetic follow-up of tissue colonization by the parasite.

  10. Genetic and morphological variability in South American rodent Oecomys (Sigmodontinae, Rodentia): evidence for a complex of species.

    Science.gov (United States)

    Rosa, C C; Flores, T; Pieczarka, J C; Rossi, R V; Sampaio, M I C; Rissino, J D; Amaral, P J S; Nagamachi, C Y

    2012-01-01

    The rodent genus Oecomys (Sigmodontinae) comprises ~16 species that inhabit tropical and subtropical forests in Central America and South America. In this study specimens of Oecomys paricola Thomas, 1904 from Belém and Marajó island, northern Brazil, were investigated using cytogenetic, molecular and morphological analyses. Three karyotypes were found, two from Belém (2n = 68, fundamental number (FN) = 72 and 2n = 70, FN = 76) and a third from Marajó island (2n = 70, FN = 72). No molecular or morphological differences were found between the individuals with differing cytotypes from Belém, but differences were evident between the individuals from Belém and Marajó island. Specimens from Belém city region may represent two cryptic species because two different karyotypes are present in the absence of significant differences in morphology and molecular characteristics. The Marajó island and Belém populations may represent distinct species that have been separated for some time, and are in the process of morphological and molecular differentiation as a consequence of reproductive isolation at the geographic and chromosomal levels. Thus, the results suggest that O. paricola may be a complex of species.

  11. Comparison between Oligoryzomys nigripes and O. flavescens by RAPD and genetic diversity in O. nigripes (Rodentia, Cricetidae

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    AJ Mossi

    Full Text Available The genus of Oligoryzomys includes species of small size, morphologically similar, which may impede taxonomic identification, mainly between O. flavescens (Waterhouse, 1837 and O. nigripes (Olfers, 1818. The main objective of this work was to investigate whether the RAPD markers are capable of genetically differentiating the specimens O. nigripes and O. flavescens, coming from Rio Grande do Sul (RS and Santa Catarina (SC states, and also to estimate the genetic variability among populations of O. nigripes, with the Uruguay River as a geographical barrier. For this purpose, samples were collected in fragments of forests situated in the North of RS, at FLONA (Floresta Nacional de Passo Fundo and in fragments from SC, close to the Uruguay River. The karyotyping of two samples for each species was carried out and compared using the RAPD technique together with non- karyotyped individuals. Samples of O. nigripes presented 2n = 62; NA = 82, with submetacentric arms on the largest chromosomes, while samples of O. flavescens showed 2n = 64; NA = 66, with the largest chromosomes presenting acrocentric morphology, making such a result the main difference between the species. The analysis was able to detect two distinct groups, being the first one with karyotyped O. flavescens and the second with karyotyped O. nigripes. Identification afforded 211 loci, among them 181 (85.78% polymorphic. The Jaccard similarity coefficient was in the range of 0.45 to 0.87. The UPGMA and Main Coordinate Analysis techniques demonstrated the existence of heterogeneous genetics among populations, but did not separate them completely in terms of geographical standards, and they are not influenced by the Uruguay River, which did not act as an efficient barrier.

  12. Genetic differentiation in geographically close populations of the water rat Nectomys squamipes (Rodentia, Sigmodontinae from the Brazilian Atlantic Forest

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    Maroja L.S.

    2003-01-01

    Full Text Available We examined the genetic structure and the effects of a bottleneck in populations of the water rat Nectomys squamipes, a primary host of Schistosoma mansoni. Eight microsatellite loci were studied in 7 populations from the Sumidouro region of the Brazilian state of Rio de Janeiro. Our data, covering a four-year period during which a bottleneck occurred, revealed substantial variation (6-31 alleles per locus and high levels of both observed (0.718-0.789 and expected (0.748-0.832 heterozygosity. Most populations were in Hardy-Weinberg equilibrium without linkage disequilibrium between loci. Overall average genetic differentiation between populations (estimated with the F ST (q and R ST (r analogues was 0.037 for q and 0.060 for r. There was significant allelic and genotypic differentiation between populations, especially in pairwise comparisons that included the most geographically isolated population. Direct migration estimates showed a low rate of migration, indicating that infected N. squamipes populations had a limited ability to spread S. mansoni. When the pre- and post-bottleneck populations were compared there was no detectable reduction in heterozygosity or allele number, although a significant excess of heterozygosity was detected in the post-bottleneck population.

  13. Genetic and morphological variability in South American rodent Oecomys (Sigmodontinae, Rodentia): evidence for a complex of species

    Indian Academy of Sciences (India)

    C. C. Rosa; T. Flores; J. C. Pieczarka; R. V. Rossi; M. I. C. Sampaio; J. D. Rissino; P. J. S. Amaral; C. Y. Nagamachi

    2012-12-01

    The rodent genus Oecomys (Sigmodontinae) comprises ∼16 species that inhabit tropical and subtropical forests in Central America and South America. In this study specimens of Oecomys paricola Thomas, 1904 from Belém and Marajó island, northern Brazil, were investigated using cytogenetic, molecular and morphological analyses. Three karyotypes were found, two from Belém ($2n = 68$, fundamental number (FN) = 72 and $2n = 70$, FN = 76) and a third from Marajó island ($2n = 70$, FN = 72). No molecular or morphological differences were found between the individuals with differing cytotypes from Belém, but differences were evident between the individuals from Belém and Marajó island. Specimens from Belém city region may represent two cryptic species because two different karyotypes are present in the absence of significant differences in morphology and molecular characteristics. The Marajó island and Belém populations may represent distinct species that have been separated for some time, and are in the process of morphological and molecular differentiation as a consequence of reproductive isolation at the geographic and chromosomal levels. Thus, the results suggest that O. paricola may be a complex of species.

  14. Litomosoides anguyai n. sp. (Nematoda: Onchocercidae) from Oxymycterus misionalis (Rodentia: Muridae) in the rain forest of Misiones, Argentina.

    Science.gov (United States)

    Notarnicola, Juliana; Bain, Odile; Navone, Graciela

    2002-06-01

    A new species of Litomosoides is described from sigmodontine murids occurring in the rain forests of Misiones, Argentina. Litomosoides anguyai n. sp., a parasite of the abdominal cavity of Oxymycterus misionalis, belongs to the sigmodontis group and is closely related to L. legerae and L. oxymycteri. The new species is differentiated by the salient amphids, an asymmetrical annular thickening of the buccal capsule, by the arrangement of the head and tail papillae, and the shape and size of the microfilaria.

  15. Penial morphology in three species of Brazilian tuco-tucos, Ctenomys torquatus, C. minutus, and C. flamarioni (Rodentia: Ctenomyidae).

    Science.gov (United States)

    Rocha-Barbosa, O; Bernardo, J S L; Loguercio, M F C; Freitas, T R O; Santos-Mallet, J R; Bidau, C J

    2013-02-01

    The present study analyses the glans penis and baculum morphology of three Brazilian tuco-tucos, Ctenomys torquatus Lichtenstein, 1830, Ctenomys minutus Nehring, 1887 and Ctenomys flamarioni Travi, 1981, in order to identify possible variations and understand some more about this taxonomically complex group. We used fixed penis from 15 previously listed adult specimens. For a more detailed baculum analysis, the penis underwent dissection and diaphanisation, whereas to analyse the glans penis surface we used Scanning Electron Microscopy (SEM). Results showed striking differences in baculum morphology among the three species. While C. minutus have a particular V-shaped proximal baculum tip, C. flamarioni baculum is thin throughout the shaft with rounded proximal and distal tips. Ctenomys torquatus have a shorter and larger baculum, similar to what has previously been described for the species. Glans penis surface microstructure analyses also revealed inter-specific differences, with penial spines varying in shape, size and, especially density. Although C. torquatus has a relatively small penis, it has the largest penial spine density, which suggests a more complex penial ornamentation in this species.

  16. New data on occurrence of Demodex flagellurus (Acari, Demodecidae) - rarely recorded parasite from the house mouse Mus musculus (Rodentia, Muridae).

    Science.gov (United States)

    Izdebska, Joanna N; Rolbiecki, Leszek

    2015-01-01

    Demodex flagellurus Bukva, 1985 is one of two known demodecid mites of the house mouse Mus musculus Linnaeus, 1758, in which it is observed in genital area. Skin fragments of 30 house mice from various regions of Poland (residential buildings in Gdynia and Gdańsk, rural region in Wielkopolska-Kujawska Lowland) were examined. The mites were noted in 25.0% of the mice, with mean intensity of 48.0 and intensity range of 2-103. D. flagellurus demonstrated the differentiated occurrence in host populations.

  17. Demodex castoris sp. nov. (Acari: Demodecidae) parasitizing Castor fiber (Rodentia), and other parasitic arthropods associated with Castor spp.

    Science.gov (United States)

    Izdebska, Joanna N; Fryderyk, Sławomira; Rolbiecki, Leszek

    2016-02-11

    A new species of demodecid mite, Demodex castoris sp. nov. (Acari: Prostigmata: Demodecidae), is described based on adult stages from the skin of the nasal region of the Eurasian beaver Castor fiber Linnaeus, 1758, collected in Poland. This is the first detection of a representative demodecid mite in rodents of the suborder Castorimorpha and also represents the first detection of a skin mite in Eurasian beavers. The new species is a small skin mite (average 173 µm in length) characterized by sexual dimorphism related to body proportions. D. castoris sp. nov. was observed in 4 out of 6 beavers examined (66.6%), with a mean intensity of 10.8 and an intensity range of 2-23 ind. host(-1). This paper also contains a checklist of parasitic arthropods known from Castor spp.

  18. Napoleon Bonaparte and the fate of an Amazonian rat: new data on the taxonomy of Mesomys hispidus (Rodentia: Echimyidae).

    Science.gov (United States)

    Orlando, Ludovic; Mauffrey, Jean-François; Cuisin, Jacques; Patton, James L; Hänni, Catherine; Catzeflis, François

    2003-04-01

    The spiny rat Mesomys hispidus is one of many South American rodents that lack adequate taxonomic definition. The few sampled populations of this broadly distributed trans-Amazonian arboreal rat have come from widely separated regions and are typically highly divergent. The holotype was described in 1817 by A.-G. Desmarest, after Napoleon's army brought it to Paris following the plunder of Lisbon in 1808; however, the locality of origin has remained unknown. Here we examine the taxonomic status of this species by direct comparison of 50 extant individuals with the holotype at the morphometric and genetic levels, the latter based on 331 bp of the mitochondrial cytochrome b gene retrieved from a small skin fragment of the holotype with ancient DNA technology. Extensive sequence divergence is present among samples of M. hispidus collected from throughout its range, from French Guiana across Amazonia to Bolivia and Peru, with at least seven mitochondrial clades recognized (average divergence of 7.7% Kimura 2-parameter distance). Sequence from the holotype is, however, only weakly divergent from those of recent samples from French Guiana. Moreover, the holotype clusters with greater that 99% posterior probability with samples from this part of Amazonia in a discriminant analysis based on 22 cranial and dental measurements. Thus, we suggest that the holotype was originally obtained in eastern Amazonia north of the Amazon River, most likely in the Brazilian state of Amapá. Despite the high level of sequence diversity and marked morphological differences in size across the range of M. hispidus, we continue to regard this assemblage as a single species until additional samples and analyses suggest otherwise.

  19. Leishmania mexicana in Proechimys iheringi denigratus Moojen (Rodentia, Echimyidae in a region endemic for American cutaneous leishmaniasis

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    Air C. Barretto

    1985-12-01

    Full Text Available Three isolates of Leishmania were recovered from five of 27 specimens of the rodent Proechimys iheringi denigratus Moojen captured near Três Braços in the Atlantic Forest region of Bahia, Brazil. Two of these isolates were recovered from hamsters inoculated with a pooled triturate of liver, spleen and skin tissue from apparently healthy P. i. denigratus. The third isolate was recovered from a triturate of only skin tissue from another. Metastasis was observed in the inoculated hamsters, the parasites grew abundantly in artificial media and a typical suprapylarial pattern of infection in Lutzomyia longipalpis was produced indicating that the parasites belong to the Leishmania mexicana complex. All isolates reacted with Leishmania mexicana mexicana and Leishmania mexicana amazonensis monoclonal antibodies. The isoenzyme analysis differentiated these isolates from standard isolates of L. m. mexicana, L. m. amazonensis, L. m. aristedesi, L. m. pifanoi, L. m. garnhami and L. m. ssp.(Goiás-W. Barbosa. These isolates seem to be a subspecies of L. mexicana very closely related to L. m. amazonensis from which they differ by decreased electrophoretic mobility of GPI, PEP and ALAT. This is the first record of the isolation of a parasite of thegenus Leishmania in a rodent captured in the State of Bahia.

  20. Descripción del postcráneo de Rhipidomys austrinus y Graomys griseoflavus (Rodentia, Cricetidae, Sigmodontinae

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    Luz V. Carrizo

    2011-09-01

    Full Text Available Se describe el esqueleto postcraneal de dos especies de roedores sigmodontinos Rhipidomys austrinus Thomas, 1921 y Graomys griseoflavus (Waterhouse, 1837. Se detalla cada estructura del esqueleto postcraneal sobre la base de la forma, tamaño, superficie y orientación de cada elemento esqueletal. La anatomía postcraneal de estas dos especies muestra caracteres asociados a patrones morfológicos diferentes, vinculados a su modo de locomoción. Es así que R. austrinus exhibe características en varios elementos del postcráneo consistente con una locomoción arborícola, mientras G. griseoflavus muestra atributos en su esqueleto relacionados a una locomoción de tipo terrestre.

  1. New Details of the Eurasian Beaver’s, Castor Fiber (Rodentia, Castoridae, Expansion in the Lowland Part of Transcarpathia, Ukraine

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    Barkasi Z.

    2016-12-01

    Full Text Available The present paper contains information on a new beaver colony discovered in the Chornyi mochar tract, which is located in the lowland part of Transcarpathia (= Zakarpattia Region. This rodent species disappeared from the territory of Transcarpathia most likely in the 18th century. Its first reappearance was recorded in 2003. Since, the Eurasian beaver has demonstrated a rapid expansion, primarily along the main rivers. The discovered by us colony allows to suggest that the beaver is continuing its dispersal, entering far into the main river’s tributaries and other shallower water bodies. Consequently, we are witnessing not only the expansion of the species’ geographical range, but also the enlargement of the number of habitat types occupied by the animal. The possibilities and supposed consequences of the species’ further expansion within the tract are shown as well.

  2. Into Tibet: An Early Pliocene Dispersal of Fossil Zokor (Rodentia: Spalacidae) from Mongolian Plateau to the Hinterland of Tibetan Plateau.

    Science.gov (United States)

    Li, Qiang; Wang, Xiaoming

    2015-01-01

    This paper reports the fossil zokors (Myospalacinae) collected from the lower Pliocene (~4.4 Ma) of Zanda Basin, southwestern Tibet, which is the first record in the hinterland of Tibetan Plateau within the Himalayan Range. Materials include 29 isolated molars belonging to Prosiphneus eriksoni (Schlosser, 1924) by having characters including large size, highly fused roots, upper molars of orthomegodont type, m1 anterior cap small and centrally located, and first pair of m1 reentrants on opposing sides, high crowns, and high value of dentine tract parameters. Based on the cladistics analysis, all seven species of Prosiphneus and P. eriksoni of Zanda form a monophyletic clade. P. eriksoni from Zanda, on the other hand, is nearly the terminal taxon of this clade. The appearance of P. eriksoni in Zanda represents a significant dispersal in the early Pliocene from its center of origin in north China and Mongolian Plateau, possibly via the Hol Xil-Qiangtang hinterland in northern Tibet. The fast evolving zokors are highly adapted to open terrains at a time when regional climates had become increasingly drier in the desert zones north of Tibetan Plateau during the late Miocene to Pliocene. The occurrence of this zokor in Tibet thus suggests a rather open steppe environment. Based on fossils of large mammals, we have formulated an "out of Tibet" hypothesis that suggests earlier and more primitive large mammals from the Pliocene of Tibet giving rise to the Ice Age megafauna. However, fossil records for large mammals are still too poor to evaluate whether they have evolved from lineages endemic to the Tibetan Plateau or were immigrants from outside. The superior record of small mammals is in a better position to address this question. With relatively dense age intervals and numerous localities in much of northern Asia, fossil zokors provide the first example of an "into Tibet" scenario--earlier and more primitive taxa originated from outside of the Tibetan Plateau and the later the lineage became extinct in southwestern Tibet.

  3. A new species of Trichuris Roederer, 1761 (Nematoda: Trichuridae) from Heteromys gaumeri Allen & Chapman (Rodentia: Heteromyidae) in Yucatan, Mexico.

    Science.gov (United States)

    Panti-May, Jesús Alonso; Robles, María Del Rosario

    2016-09-01

    In Mexico, four species of Trichuris Roederer, 1761 have been recorded in wild rodents belonging to the family Heteromyidae. In the present paper, we describe a new species based on specimens collected from Heteromys gaumeri Allen & Chapman (Heteromyidae: Heteromyinae) in the tropical forests of the Yucatan Peninsula, Mexico. Trichuris silviae n. sp. can be differentiated from the congeners described in North and South American rodents by morphological and morphometric features, such as the possession of a wide spicular tube, a thicker proximal cloacal tube, a shorter distal cloacal tube and a cylindrical spicular sheath. This is the first description of a Trichuris spp. from heteromyid rodents in Mexico and the fourth in North America. Despite the broad distribution of Heteromys spp., few cases of Trichuris infection have been reported. Further studies are necessary to verify if the new species is present in other heteromyid rodents in order to increase our knowledge about its geographical and host distribution.

  4. Host cell/Orientia tsutsugamushi interactions: evolution and expression of syndecan-4 in Asian rodents (Rodentia, Muridae).

    Science.gov (United States)

    Badenhorst, Daleen; Tatard, Caroline; Suputtamongkol, Yupin; Robinson, Terence J; Dobigny, Gauthier

    2012-07-01

    Scrub typhus is an acute febrile zoonotic disease and worldwide more than a billion people may be at risk for infection. Orientia tsutsugamushi, the causative agent of scrub typhus, is an obligate intracellular bacterium. Rodents are reported to be the primary reservoir hosts of the disease and according to the most recent surveys, all species within the Rattus sensu lato complex of the tribe Rattini are carriers of scrub typhus. There is no evidence that any of mouse (Mus) species serves as the primary reservoir of the bacterium even when occurring in sympatry with wild infected rats. This contrast in the host/syndecan-4 interactions between Rattini and Asian Murini may be due to intrinsic (i.e., genetic) differences. Herein we compare the sequence and expression levels of syndecan-4 (the putative cell receptor of O. tsutsugamushi) between Rattini species that are known to be natural reservoirs for the typhus agents, and Murini species that are not. Although it was not possible to conclusively link the structural variations detected in syndecan-4 with carrier status in either Rattini and Murini, our findings indicate the absence of a strong Orientia-mediated selective regime acting on gene structure. In contrast, variable spleen-specific syndecan-4 expression levels show a strong correlation between under-expression of syndecan-4 in Murini and seropositive Rattini, compared to seronegative Rattini rodents. We postulate that two divergent responses may be at work in Murini and Rattini, both linked with differential expression of syndecan-4: (i) reduced syndecan-4 transcription in Murini decreases the likelihood that the host cells will become infected by the Orientia bacterium, while (ii) reduced syndecan-4 expression in seropositive Rattini limits the pathogenicity of Orientia and consequently improves the longevity of the rat hosts. These patterns may underpin the poor carrier status of wild mice on the one hand, and the effective role of wild rats as reservoir hosts on the other.

  5. Evolutionary and biological implications of dental mesial drift in rodents: the case of the Ctenodactylidae (Rodentia, Mammalia).

    Science.gov (United States)

    Gomes Rodrigues, Helder; Solé, Floréal; Charles, Cyril; Tafforeau, Paul; Vianey-Liaud, Monique; Viriot, Laurent

    2012-01-01

    Dental characters are importantly used for reconstructing the evolutionary history of mammals, because teeth represent the most abundant material available for the fossil species. However, the characteristics of dental renewal are presently poorly used, probably because dental formulae are frequently not properly established, whereas they could be of high interest for evolutionary and developmental issues. One of the oldest rodent families, the Ctenodactylidae, is intriguing in having longstanding disputed dental formulae. Here, we investigated 70 skulls among all extant ctenodactylid genera (Ctenodactylus, Felovia, Massoutiera and Pectinator) by using X-ray conventional and synchrotron microtomography in order to solve and discuss these dental issues. Our study clearly indicates that Massoutiera, Felovia and Ctenodactylus differ from Pectinator not only by a more derived dentition, but also by a more derived eruptive sequence. In addition to molars, their dentition only includes the fourth deciduous premolars, and no longer bears permanent premolars, conversely to Pectinator. Moreover, we found that these premolars are lost during adulthood, because of mesial drift of molars. Mesial drift is a striking mechanism involving migration of teeth allowed by both bone remodeling and dental resorption. This dental innovation is to date poorly known in rodents, since it is only the second report described. Interestingly, we noted that dental drift in rodents is always associated with high-crowned teeth favoring molar size enlargement. It can thus represent another adaptation to withstand high wear, inasmuch as these rodents inhabit desert environments where dust is abundant. A more accurate study of mesial drift in rodents would be very promising from evolutionary, biological and orthodontic points of view.

  6. First record of Mylagaulid rodents (Rodentia, Mammalia) from the Miocene of Eastern Siberia (Olkhon Island, Baikal Lake, Irkutsk Region, Russia).

    Science.gov (United States)

    Tesakov, A S; Lopatin, A V

    2015-01-01

    A new genus and species of rodent, Lamugaulus olkhonensis, belonging to the subfamily Promylagaulinae of the family Mylagaulidae, is described on the basis of isolated teeth from the Khalagay Formation of the Lower Miocene Tagay locality (Olkhon island, Lake Baikal, Irkutsk Region). This is the first record of mylagaulids in Eastern Siberia, significantly expanding the data on the distribution of this mainly North American group of rodents in Asia and showing its presence outside the Central Asian arid zone.

  7. [Morphological diversity in the postnatal skull development in representatives of two families of rodents (Spalacidae, Castoridae, Rodentia)].

    Science.gov (United States)

    Puzachenko, A Iu; Korablev, N P

    2014-01-01

    This is the first study to describe the results of measurement of three information parameters of morphological diversity (entropy, the measure of organization, and the Kullback-Leibler divergence) in the course of postnatal development of the skull in the populations of two rodent species (greater mole rat (Spalax microphthalmus Guld.) and Eurasian beaver (Castor fiber (L.)). The terms "morphosystem" and "morphological space" and its structure are introduced. Within the framework of the developed approach, "morphological diversity" is considered as a variable associated with the morphological space structure. Testing the hypothesis of the dominance of self-organization processes and an increase in the organization of the morphological diversity of the skull in the course ofontogeny showed its inconsistency. The morphosystem of the skull of the studied species undergoes transitions between more organized and less organized states, periodically approaching and departing from the "steady state." Such dynamics characterizes the morphosystem of the skull as a dynamic and nonlinear system.

  8. Phylogenetic relationships in the Niviventer-Chiromyscus complex (Rodentia, Muridae inferred from molecular data, with description of a new species

    Directory of Open Access Journals (Sweden)

    Alexander Balakirev

    2014-11-01

    Full Text Available Based on molecular data for mitochondrial (Cyt b, COI and nuclear (IRBP, GHR genes, and morphological examinations of museum specimens, we examined diversity, species boundaries, and relationships within and between the murine genera Chiromyscus and Niviventer. Phylogenetic patterns recovered demonstrate that Niviventer sensu lato is not monophyletic but instead includes Chiromyscus chiropus, the only previously recognized species of Chiropus. To maintain the genera Niviventer and Chiropus as monophyletic lineages, the scope and definition of the genus Chiromyscus is revised to include at least three distinct species: Chiromyscus chiropus (the type species of Chiromyscus, C. langbianis (previously regarded as a species of Niviventer, and a new species, described in this paper under the name C. thomasi sp. n.

  9. Indicadores de condición larvaria aplicados al camarón de río del norte Cryphiops caementarius (Molina, 1782, en condiciones de cultivo controlado Larval condition indicators applied to the northern river shrimp Cryphiops caementarius (Molina, 1782, under condition of controlled cultivation

    Directory of Open Access Journals (Sweden)

    María C Morales

    2012-09-01

    Full Text Available Se estudia el desarrollo larvario del camarón de río del norte de Chile, Cryphiops caementarius, desde el estado de zoea 1 hasta el primer juvenil, caracterizando y analizando criterios que verificaron la aplicación de indicadores de tipo morfológico y de comportamiento para la evaluación de la condición larvaria de la especie, en condiciones de cultivo. Las larvas, se mantuvieron en cultivo, en un tanque de 250 L con agua a 20 psu y temperatura de 25 ± 1°C, controlada con termostato y con un recambio del 100% diariamente. La alimentación consistió en microalgas (Nannochloris sp. e Isochrysis sp., rotíferos (Brachionus plicatilis, nauplios de Artemia franciscana y alimento formulado. Se utilizaron cinco indicadores de carácter morfológico y de comportamiento aplicados a las larvas de C. caementarius: llenado intestinal, estado de la glándula digestiva, desarrollo branquial, comportamiento natatorio y respuesta fototáctica. Estos indicadores, permitieron determinar el estado de condición y calidad de las larvas de C. caementarius, logrando un efectivo seguimiento y asociación de cada uno de ellos, con cada estado de desarrollo larvario, estandarizando características deseables en las larvas y evidenciando resultados verificables, que permitan establecer un adecuado plan de seguimiento del cultivo, optimizar los protocolos de manejo y de alimentación de las larvas. Además de cada indicador, fue posible desglosar una amplia gama de potenciales estudios a realizar, basados en las relaciones que la morfología y el comportamiento larvario mantienen con las capacidades fisiológicas de las larvas en desarrollo.The larval development of the Chilean northern river shrimp Cryphiops caementarius was studied, from the condition of zoea 1 up to the condition of juvenile stage, analyzing and characterizing diverse criteria that allowed checking the application of morphological and behavioral indicators for the evaluation of the larval quality of the species, under conditions of culture. The larvae, were cultured, in a tank of 250 L with water at 20 psu, at a constant temperature (25° ± 1°C, controlled with a thermostat and with 100% refill every day. The diet consisted of microalgae (Nannochloris sp. and Isochrysis sp., rotifers (Brachionus plicatilis, nauplii of Artemia franciscana and formulated food. Five indicators were used, considering morphologic and behavior aspects: intestinal fill, midgut gland condition, gill development, swimming behavior and phototactic response. The indicators selected in the present work, were feasible of being used for the determination of the condition and quality of the larvae of C. caementarius, being able to make an effective follow-up and association with every condition of larval development, standardize desirable characteristics in the larvae and demonstrate verifiable results, using a protocol for culture and food supply. Moreover, it was possible to identify an extensive range of potential studies, based on the relationships that the morphology and the larval behavior support with the physiological capacities of the larvae in development.

  10. Ontogenetic variation in light interception, self-shading and biomass distribution of seedlings of the conifer Araucaria araucana (Molina K. Koch Variación ontogenética en la intercepción lumínica, autosombramiento y distribución de biomasa en plántulas de la conífera Araucaria araucana (Molina K. Koch

    Directory of Open Access Journals (Sweden)

    CHRISTOPHER H LUSK

    2006-09-01

    Full Text Available One of the factors thought to contribute to ontogenetic declines in plant growth rates is diminishing light interception efficiency, as a result of the difficulties of avoiding self-shading among a growing number of leaves, and by stems. The effects of plant size on self-shading and light interception have rarely been quantified, however. We used a three-dimensional digitising system to construct virtual models of the architecture of Araucaria araucana seedlings 71 to 358 mm tall, and modelled their light interception in the forest understorey using the program YPLANT. We also analyzed seedling allometry, to determine the combined effects of biomass distribution and self-shading on total light interception. Average light interception efficiencies calculated for A. araucana (29 % were the lowest reported for rainforest tree seedlings, reflecting the limitations imposed by short leaves, lack of petioles and an inability to develop planar foliage geometry on branches. Total light interception was related to seedling leaf area by an exponent of 0.735, reflecting increasing self-shading as seedlings grew bigger. However, because leaf area was related to seedling mass by an exponent of 1.24, light interception scaled nearly isometrically (0.91 power with seedling mass. This resulted from taller plants having proportionally thinner stems, and a smaller fraction of their biomass in roots. Thus, an ontogenetic increase in self-shading in A. araucana is largely offset by allocation changes which increase leaf area ratio as seedlings grow bigger. These mechanisms conserving the relationship of light interception with plant mass seem likely to be restricted to species with long-lived leaves, growing in humid situations protected from wind stress. In open habitats, where wind and drought stress likely make such allocation patterns less feasible, the role of self-shading in ontogenetic declines in relative growth rate may be more evidentLa caída en la eficiencia de intercepción de la luz es considerada como uno de los factores responsables del declive ontogenético en las tasas de crecimiento relativo de las plantas, debido a la dificultad de evitar el autosombramiento entre un creciente número de hojas. Sin embargo, rara vez se ha cuantificado el efecto de tamaño de las plantas sobre el autosombramiento y la eficiencia en intercepción de la luz. Utilizamos un sistema de digitalización para construir modelos virtuales tridimensionales de la arquitectura de plántulas 71-358 mm de alto de la conífera Araucaria araucana, y modelamos su intercepción de la luz en el sotobosque mediante el programa YPLANT. Analizamos además la alometría de las plántulas para determinar los efectos combinados de la distribución de biomasa y el autosombramiento sobre la intercepción total de luz a nivel de la planta entera. La eficiencia promedio de intercepción de la luz de A. araucana (29 % fue la más baja documentada para plántulas de especies de bosques húmedos, reflejando las limitaciones impuestas por hojas cortas, carencia de pecíolos, y la incapacidad de desarrollar follaje plagiotrópico. La intercepción total de luz por las plántulas fue proporcional al área foliar0,735, producto de un aumento en el autosombramiento en función del tamaño. Sin embargo, debido a la relación del área foliar con la potencia 1,24 de la masa de las plántulas, la intercepción de luz se acercó a la proporcionalidad directa (exponente 0,91 con la masa. Este patrón fue producto de la relativa delgadez de los tallos de las plántulas grandes, y su baja proporción de biomasa radicular. Por tanto, el declive ontogenético en la eficiencia de intercepción de la luz fue en gran medida compensada por cambios de asignación que aumentaron la superficie foliar de las plántulas grandes. Estos mecanismos que conservaron la relación de la ganancia potencial de carbono con la masa de las plántulas probablemente serán vistos solamente en especies con hojas muy longevas, en hábitats húmedos con poco viento. En ambientes abiertos, donde los estrés por sequía y viento podrían seleccionar en contra tales patrones de asignación, es probable que se evidencie más claramente el rol del autosombramiento en los declives ontogenéticos en la tasa de crecimiento relativo

  11. Descripción histológica y caracterización de los estados de madurez gonadal de hembras de Cryphiops caementarius (Molina, 1782 (Decapoda: Palaemonidae Histological description and characterization of the ovarian cycle of Cryphiops caementarius (Molina, 1782 (Decapoda: Palaemonidae

    Directory of Open Access Journals (Sweden)

    Jorge E Moreno

    2012-09-01

    Full Text Available La extracción indiscriminada y alteraciones del medio natural, han puesto en peligro de extinción al único Palaemónido dulceacuícola de interés comercial, presente en aguas continentales chilenas. Aun cuando esta situación, ha despertado el interés en estudios que permitan su reproducción controlada en cautiverio, actualmente es escaso el conocimiento acerca de aspectos reproductivos básicos de esta especie. Dada su importancia, este trabajo describe y caracteriza el proceso completo de maduración gonadal en hembras de Cryphiops caementarius, en base a cambios en la morfología externa e interna del ovario. Hembras adultas extraídas del río Limarí, fueron disectadas y sus ovarios removidos y preparados para análisis histológicos. Tejido fibromuscular divide el tejido gonadal de cada lóbulo en sacos ováricos de forma semicónica (conos de maduración, al interior del los cuales se encuentran ovocitos en diferentes estados de desarrollo de acuerdo a observaciones microscópicas de tamano, morfología y tinción con H-E, las células reproductoras femeninas se clasificaron en seis tipos, ovogonias (Ov, ovocitos previtelogénicos tempranos (O1, ovocitos previtelogénicos tardíos (O2, ovocitos vitelogénicos tempranos (O3, ovocitos vitelogénicos tardíos (O4 y ovocitos Maduros (OM. El ciclo de madurez gonadal se dividió en cinco estados según la cantidad y tipo de ovocitos presentes. Los estados 0 y I, corresponden a desovado y previtelogénesis. Los estados II y III a vitelogénesis temprana y vitelogénesis intermedia, mientras el estado IV corresponde a madurez avanzada. La presencia de ovogonias y ovocitos previtelogénicos junto a ovocitos completamente maduros en el estado de madurez avanzada, refleja la capacidad de esta especie de realizar ciclos consecutivos de madurez en intervalos cortos de tiempo.Its indiscriminate extraction and alterations of its natural environment, has put in danger of extinction the only commercial freshwater Palemonid present in Chilean inland waters. Even though this situation has awakened interest in studies which allow its controlled reproduction in captivity, currently little is known regarding basic reproductive aspects of this species. Given its relevance, this work describes and characterizes the whole ovarian cycle of Cryphiops caementarius, based on changes in external and internal ovarian morphology. Adult C. caementarius females, obtained from Limarí River, were dissected and its ovaries removed and prepared for histological examinations. Fibromuscular tissue divides the ovarian tissue of each lobe into cone-shaped ovarian pouches (Maturation cones, each one containing various steps of oocytes according to the stages of ovarian development. Based on light microscopic observations of cells' sizes, morphology, and staining with H-E, the female germ cells could be classified into six different types, which include oogonia (Ov, early previtellogenic oocytes (O1, late previtellogenic oocytes (O2, early vitellogenic oocytes (O3, late vitellogenic oocytes (O4 and mature oocytes (OM. The ovarian cycle is divided into five stages based on the amount and types of oocytes present in each stage. Stage 0 and I are spawned and previtellogenesis stages. Stage II and III are early and intermediate vitellogenesis stages, while stage IV is maturity advanced stage. The presence of oogonia and previtellogenic oocytes among fully mature oocytes in stage IV reflect the capacity of the ovary of C. caementarius females to start a new full maturity cycle in a short time period.

  12. TITLE: La mujer por fuerza, El condenado por desconfiado and El burlador de Sevilla, Three Comedies Attributed to Tirso de Molina. TÍTULO: La mujer por fuerza, El condenado por desconfiado y El burlador de Sevilla, tres comedias atribuidas a Tirso de Molina

    Directory of Open Access Journals (Sweden)

    Alfredo Rodríguez López-Vázquez

    2010-03-01

    Full Text Available ABSTRACT:We expose three attribution problems in several cases of doubtful authorship in the theater of the Siglo de Oro: "El condenado por desconfiado" and "La mujer por fuerza", both edited as Tirso’s works in the problematic "Segunda parte" and "El burlador de Sevilla", edited under the name of Tirso in the volume "Doze comedias de Lope de Vega y otros autores" (about 1630. We have applied a methodology concerning the analysis of metaphors and inusual lexical items, and we have comparated it with several works by the two dramaturgians concerned by its attributions, Tirso and Claramonte, and also with several others, as reference group. We conclude that "La mujer por fuerza" is a work by Tirso, "El burlador de Sevilla" is a Claramonte’s work, and "El condenado por desconfiado" is also a work by Claramonte, perhaps with a collaboration from Mira de Amescua. RESUMEN: Planteamos tres problemas de atribución de obras autoría dudosa en el teatro del Siglo de Oro: "El condenado por desconfiado" y "La mujer por fuerza", editadas a nombre de Tirso en la problemática "Segunda parte", y "El burlador de Sevilla", editada a nombre de Tirso en el volumen de "Doze comedias de Lope de Vega y otros autores" (circa 1630. Aplicamos una metodología de análisis de metáforas y de léxico poco usual, y cotejamos con varias obras de los dos dramaturgos implicados en su atribución, Tirso y Claramonte, y varios autores más como grupo de referencia. Concluimos que "La mujer por fuerza" es obra de Tirso, "El burlador de Sevilla" es obra de Claramonte, y que "El condenado por desconfiado" es obra de Claramente, tal vez en colaboración con Mira de Amescua.

  13. Líneas para desarrollar un saber del derecho penal internacional de contención. En Molina, R. (Coord.). Lecciones de Derecho penal, procedimiento penal y política criminal. (pp. 99-141).

    OpenAIRE

    Martínez, Javier Botero

    2014-01-01

    El autor, luego de aludir a la paternidad y di­ferencias entre las locuciones derecho penal internacional e internacional penal (Völkerstra­frecht o Internacionales Strafrecht), y de indi­car que empleará el nombre de derecho penal Internacional (Völkerstrafrecht) para denotar lo que algunos llaman derecho internacional penal (Völkerstrafrecht o Internacionales Stra­frecht) procede, no sin antes hacer una breve historia en el ámbito colombiano del mismo, a diferenciar las nociones de poder pu...

  14. La interacción. Planificación-gestión para el desarrollo urbano local en los distritos consolidados del area metropolitana / caso: distrito de la Molina y San Isidro

    OpenAIRE

    Chilet Cama, Shirley Emperatriz

    2010-01-01

    El fenómeno de la globalización en los mercados internacionales ha generado un efecto doble e inverso: primero, de concentración de fuerzas productivas en determinadas zonas geográficas y segundo, de des-localización de bloques productivos hacia distintas regiones del mundo. La integración económica y los acuerdos comerciales como parte de los nuevos arreglos institucionales entre países han coadyuvado a dicho fenómeno. Como respuesta a estos dos efectos y a una nueva tendencia hacia la m...

  15. Los maestros Gilaberte, en el entorno de Molina de Aragón (Guadalajara), y su relación con José Martín de Aldehuela

    OpenAIRE

    Camacho Martínez, Rosario

    2006-01-01

    En este trabajo se presenta la actividad de una dinastía de maestros arquitectos del norte de Castilla, especialmente Manuel Gilaberte, que fue discípulo y colaborador de José Martín de Aldehuela, colaboración que ha permitido la atribución a éste de algunas obras, ya aclarada la autoría por la investigación documental. This manuscript presents the activity of a northern castillian dinasty of master architects, in particular Manuel Gilaberte, pupil and co-worker of José Martín ...

  16. Nobel Prize in Chemistry 1995 "for their work in atmospheric chemistry, particularly concerning the formation and decomposition of ozone" : Paul J Crutzen, Mario J Molina and F Sherwood Rowland

    CERN Multimedia

    1997-01-01

    Prof. Paul J Crutzen presents "The stratospheric ozone hole : a man-caused chemical instability".The discovery of the spring time stratospheric ozone hole by scientists of the British Antarctic Survey, led by Joe Farman, was one of the greatest surprises in the history of the atmospheric sciences and global change studies. After intensive research efforts by many international scientific teams it has clearly been demonstrated that the observed rapid ozone depletions are due to catalytic reactions involving CIO radicals, more than 80571130f which are produced by the photochemical breakdown of the industrial chlorofluorocarbon (CFC) gases. In this lecture I will present the course of events leading to the rapid ozone depletions. International agreements have been reached to forbid the production of the CFC gases. However, despite these measures, it will take almost 50 years before the ozone hole will have disappeared. I will also show that mankind has indeed been very lucky and that things could have been far w...

  17. Toward the characteristics of the development of the seedlings and immature plants of Araucaria araucana (Molina K. Koch (Araucariaceae in its natural habitats (Neuquén Province, Argentina

    Directory of Open Access Journals (Sweden)

    N.L. Kazakova

    2014-04-01

    Full Text Available Araucaria forests were studied and their types were distinguished. Descriptive characteristics of defined forest types were established. Araucaria araucana regrowth rate and seed survival expressed as thousands per hectare were estimated in the natural habitats of araucaria. The anatomical features of needles of immature and generative plants were compared. A. araucana life cycle from the seedling to the immature developmental stage was described. Growth power classes of immature plants were defined according to the environmental conditions of A. araucana growth.

  18. La mujer por fuerza, El condenado por desconfiado and El burlador de Sevilla, Three Comedies Attributed to Tirso de Molina

    OpenAIRE

    Alfredo Rodríguez López-Vázquez

    2010-01-01

    We expose three attribution problems in several cases of doubtful authorship in the theater of the Siglo de Oro: El condenado por desconfiado and La mujer por fuerza, both edited as Tirso’s works in the problematic Segunda parte and El burlador de Sevilla, edited under the name of Tirso in the volume Doze comedias de Lope de Vega y otros autores (about 1630). We have applied a methodology concerning the analysis of metaphors and inusual lexical items, and we have comparated it with several wo...

  19. TITLE: La mujer por fuerza, El condenado por desconfiado and El burlador de Sevilla, Three Comedies Attributed to Tirso de Molina. TÍTULO: La mujer por fuerza, El condenado por desconfiado y El burlador de Sevilla, tres comedias atribuidas a Tirso de Molina

    OpenAIRE

    Alfredo Rodríguez López-Vázquez

    2010-01-01

    ABSTRACT:We expose three attribution problems in several cases of doubtful authorship in the theater of the Siglo de Oro: "El condenado por desconfiado" and "La mujer por fuerza", both edited as Tirso’s works in the problematic "Segunda parte" and "El burlador de Sevilla", edited under the name of Tirso in the volume "Doze comedias de Lope de Vega y otros autores" (about 1630). We have applied a methodology concerning the analysis of metaphors and inusual lexical items, and we have comparated...

  20. Honors

    Science.gov (United States)

    2013-08-01

    Mario Molina has been selected to receive the Presidential Medal of Freedom, the White House announced on 8 August. Molina, who was a recipient of the Nobel Prize in Chemistry in 1995 for discovering how chlorofluorocarbons deplete the ozone layer, is a professor at the University of California, San Diego; director of the Mario Molina Center for Energy and Environment in Mexico City, Mexico; and a member of the President's Council of Advisors on Science and Technology.

  1. Primer registro del ratón colombiano del bosque Chilomys instans (Cricetidae: Rodentia en Cajamarca: actualizando el listado de mamíferos del Perú

    Directory of Open Access Journals (Sweden)

    César E. Medina

    2016-12-01

    Full Text Available El roedor Chilomys instans (Thomasomyini, Cricetidae es una especie común en la comunidad de mamíferos que habita los Andes del Norte en Sudamérica. Aquí presentamos el primer registro de la especie para el Perú, en base a la revisión morfológica de tres ejemplares colectados en el departamento de Cajamarca (Andes del Centro. Se presentan comentarios sobre la taxonomía de C. instans e información sobre su historia natural. La amplia distribución del género Chilomys en los Andes pone de manifiesto la necesidad de realizar la revisión taxonómica de éste género para esclarecer los límites de las especies que la conforman.

  2. Trichospirura aethiopica n. sp. (Nematoda: Rhabdochonidae from Malacomys longipes (Rodentia: Muridae in Gabon, first record of the genus in the Ethiopian Realm

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    Bain Odile

    2013-01-01

    Full Text Available Trichospirura aethiopica n. sp. is described from unidentified tubular structures (pancreatic ducts? near the stomach of the murid Malacomys longipes Milne-Edwards, 1877 in Gabon. The extremely long and narrow buccal capsule, posterior position of the vulva, unequal spicules and absence of caudal alae readily identified the specimens as belonging to Trichospirura Smith & Chitwood, 1967, but a combination of several characters distinguished them from the described species in this genus. Males of the new species are characterized by the absence of precloacal papillae, the presence of four pairs of postcloacal papillae and a left spicule length of 165–200 μm. With only five nominal and one unnamed species, the host range of Trichospirura extends into the Neotropical, Indo-Malayan and Ethiopian Realms and comprises three classes of vertebrates, Amphibia, Reptilia and Mammalia, suggesting a larger species diversity than that currently recorded. Detection is difficult as predilection sites are often outside the gut lumen. It was noted that, irrespective of their geographic origin, species from mammals share certain characters (shorter left spicule and absence of precloacal papillae that oppose them to those from amphibians and reptiles. A hypothesis for the origin of Trichospirura in mammals through a remote host-switching event in tupaiids in southern Asia, likely facilitated by the intermediate hosts, and for their subsequent migration to the Ethiopian and finally Neotropical Realm is proposed. Regarding the two species from anurans and saurians in the Antilles, one or two host-switching events are considered equally possible, based on morphological characters.

  3. Pulgas (Siphonaptera parásitas de roedores (Rodentia: Cricetidae de la provincia de Salta, Argentina: nuevos registros de distribución

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    M. Fernanda LÓPEZ BERRIZBEITIA

    2013-01-01

    Full Text Available Se mencionan nuevos registros de distribución geográfica y hospeda - toria para pulgas parásitas de roedores sigmodontinos de la provincia de Salta, Ar - gentina. Se reportan por primera vez en Salta las siguientes especies: Craneopsylla minerva minerva (Rothschild; Agastopsylla pearsoni Traub; y Neotyphloceras cras - sispina hemisus Jordan; así como los géneros Cleopsylla Rothschild y Plocopsylla Jordan . Agastopsylla pearsoni se cita por primera vez para la Argentina. También se aumenta el número de especies de parásitos conocidos para cinco especies de roedores y se registran ocho nuevas asociaciones parásito-hospedador.

  4. Evidence for eight tandem and five centric fusions in the evolution of the karyotype of Aethomys namaquensis A. Smith (Rodentia: Muridae).

    Science.gov (United States)

    Baker, R J; Qumsiyeh, M B; Rautenbach, I L

    1988-06-30

    G- and C-banded chromosomes of Aethomys namaquensis (2n = 24), A. chrysophilus (2n = 44), and Praomys coucha (2n = 36) are compared and contrasted with published material on Australian Muridae and North American Sigmodontidae. Direction and types of chromosomal rearrangements are established using cladistic methodology. An acrocentric morphology for chromosomes 5, 14, 15 and 20 (numbering system from Peromyscus) are proposed as primitive for the common ancestor of the Muridae and Sigmodontidae rodent lineages. Reduced diploid number of Aethomys namaquensis is derived by eight tandem and five centric fusions since divergence from the common ancestor with A. chrysophilus. The two species of Aethomys share one derived metacentric chromosome that distinguishes them from Praomys. Praomys has unique chromosomes which can be derived from the proposed primitive condition by five centric fusions and five pericentric inversions. It is concluded that karyotypic orthoselection for tandem and centric fusions is best explained by cellular or biochemical mechanisms rather than variation in population characteristics.

  5. Demography, reproductive biology and diet of the bushveld gerbil Tatera leucogaster (Rodentia: Gerbillinae) in the Lake Rukwa valley, southwestern Tanzania

    DEFF Research Database (Denmark)

    Odhiambo, Richgard O.; Makundi, Rhodes H.; Leirs, Herwig;

    2008-01-01

    Seasonal abundance, reproductive biology and feeding ecology of the bushveld gerbil Tatera leucogaster (Peters, 1852) were investigated in small-scale maize field-fallow land mosaics in south-western Tanzania. The gerbils were collected over a 2-year period using Sherman live and Victor hold-fast...

  6. A study on ecology, morphology and morphometry of Acomys dimidiatus Cretzschmar, 1826 (Rodentia: Muridae in Geno sanctuary and Minab County, Hormozgan Province, Iran

    Directory of Open Access Journals (Sweden)

    Mohammad Reza Ashrafzadeh

    2012-03-01

    Full Text Available In the present study, two populations of Acomys dimidiatus from different locations of Hormozgan Province (Geno sanctuary and Minab County were compared according to their morphometric, morphological and ecological characteristics. Fifty eight specimens of adult A. dimidiatus were collected by live traps (Sherman traps, Havahart traps and locally made traps from these regions. We caught the rodents from the height ranging from 1500 meters. According to our field observations, the studied species was mostly nocturnal. At first, five external and fifteen cranial- dental characters were measured, then ratios of measured characters to head and body length were calculated. The normality of data was analyzed by Kolmogorov- Smironov test. Descriptive statistics were calculated for characters and ratios. The results showed that the average of 14 out of 20 characters in Minab specimens was greater than Geno specimens. Also, the average of all of the ratios (20 ratios in Minab specimens was greater than that of Geno region. Independent Sample T-Test was used to test the statistical significance between length and ratios. The results indicated that there were significance differences in five out of twenty characters and nine out of twenty ratios in two regions(P<0.05. In addition, MANOVA test revealed significant differences among the studied populations (P<0.05. Also, intraspecific variations were assessed with the principal components analysis (PCA. The first two principal components accounted for more than 60% of the total variance and the species were fairly well separated by them.

  7. Small mammals (Chiroptera, Didelphimorphia, and Rodentia) from Jaíba, middle Rio São Francisco, northern Minas Gerais State, Brazil

    OpenAIRE

    Nogueira,Marcelo Rodrigues; Pol,André; Pessôa,Leila Maria; Oliveira,João Alves de; Peracchi,Adriano Lúcio

    2015-01-01

    We report the results of small mammals inventories conducted in the region of Jaíba, northern Minas Gerais state, southeastern Brazil, from 1990 to 1995. This region is located in the southern limit of the Caatinga biome, and harbors a unique set of natural ecosystems and extensive agricultural areas. With a total effort of 2964 trap-nights and 44 net sessions, we captured 893 small mammals from 46 species, including four marsupials, 13 rodents, and 29 bats. We report on species that are...

  8. Stress-associated radiation effects in pygmy wood mouse Apodemus uralensis (Muridae, Rodentia) populations from the East-Urals Radioactive Trace.

    Science.gov (United States)

    Orekhova, Natal'ya A; Modorov, Makar V

    2016-09-01

    This work is based on the comparative analysis of data obtained in the course of monitoring pygmy wood mouse populations (Apodemus uralensis Pallas, 1811) in the East-Urals Radioactive Trace (EURT) area and background territories. The effect of population size and its interaction with the radioactivity on biochemical parameters in the spleen and adrenal glands was studied. The concentrations of total lipids, proteins, DNA and RNA, activity of glucose-6-phosphate isomerase and catalase as well as the level of lipid peroxidation (LPO) were evaluated. The functional-metabolic shifts seen with large population sizes were characterized by delipidisation of adrenocortical cells, increased LPO as the main mechanism for steroidogenesis, growth of the protein components of the adrenal glands to maintain their hyperfunction, as well as immunosuppression associated with the restriction of carbohydrates providing splenocytes, reduction of DNA synthesis, and the development of a pro-/antioxidant imbalance. Reactivity of the neuroendocrine and hematopoietic systems of animals experiencing a high population density was higher in the EURT zone compared with the reference group. This difference can be explained by the additional stress from the chronic radiation exposure. The level of LPO, catalase activity, and DNA/protein ratio in the spleen and the total protein content in the adrenal glands were the most sensitive to the interaction of population size and radiation exposure. The harmful effect (distress) of the interaction of non-radiation and radiation factors can manifest when there is a population abundance above 30 ind./100 trap-day and a radiation burden which exceeds the lower boundary of the Derived Consideration Reference Levels, which is above 0.1 mGy/day.

  9. Short-term effects of avian predation variation on population size and local survival of the multimammate rat, Mastomys natalensis (Rodentia, Muridae)

    DEFF Research Database (Denmark)

    Gulck, T. van; Stocks, R.; Verhagen, Ron;

    1998-01-01

    was not true but this might be due to the small size of the experimental fields. Analysis of weekly collected raptor pellets, over a 15 month period, showed an overrepresentation of M. natalensis as prey and a strong positive correlation between the density of M. natalensis and the avian predation intensity....

  10. Toxicological Evaluation of Essential Oil From the Leaves of Croton argyrophyllus (Euphorbiaceae) on Aedes aegypti (Diptera: Culicidae) and Mus musculus (Rodentia: Muridae).

    Science.gov (United States)

    Cruz, R C D; Silva, S L C E; Souza, I A; Gualberto, S A; Carvalho, K S; Santos, F R; Carvalho, M G

    2017-01-27

    Plant-derived essential oils can be used as insecticides for vector control. However, to establish their safety, it is necessary to perform toxicological studies. Herein, we evaluated the chemical composition and insecticidal activity of the essential oil from the leaves of Croton argyrophyllus on the third- and fourth-instar larvae and adult Aedes aegypti (L., 1762). We also evaluated the acute toxicity of the essential oil in adult female Mus musculus The lethal concentration 50 (LC50) and 90 (LC90) of C. argyrophyllus essential oil on larvae of Ae. aegypti were 0.31 and 0.70 mg ml(-1), respectively, and 5.92 and 8.94 mg ml(-1), respectively, on Ae. aegypti adults. The major components of the essential oil were spathulenol (22.80%), (E)-caryophyllene (15.41%), α-pinene (14.07%), and bicyclogermacrene (10.43%). It also displayed acute toxicity in adults of Mus musculus; the intraperitoneal and oral lethal dose 50 (LD50) were 2,000 mg kg(-1) and 2,500 mg kg(-1), respectively. The results showed that the essential oil from C. argyrophyllus leaves has insecticidal activity on Ae. aegypti larvae and adults at an average lethal concentration below the median lethal dose needed to cause acute toxicity in the common mouse.

  11. Lineage-specific responses of tooth shape in murine rodents (murinae, rodentia to late Miocene dietary change in the Siwaliks of Pakistan.

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    Yuri Kimura

    Full Text Available Past ecological responses of mammals to climate change are recognized in the fossil record by adaptive significance of morphological variations. To understand the role of dietary behavior on functional adaptations of dental morphology in rodent evolution, we examine evolutionary change of tooth shape in late Miocene Siwalik murine rodents, which experienced a dietary shift toward C4 diets during late Miocene ecological change indicated by carbon isotopic evidence. Geometric morphometric analysis in the outline of upper first molars captures dichotomous lineages of Siwalik murines, in agreement with phylogenetic hypotheses of previous studies (two distinct clades: the Karnimata and Progonomys clades, and indicates lineage-specific functional responses to mechanical properties of their diets. Tooth shapes of the two clades are similar at their sympatric origin but deviate from each other with decreasing overlap through time. Shape change in the Karnimata clade is associated with greater efficiency of propalinal chewing for tough diets than in the Progonomys clade. Larger body mass in Karnimata may be related to exploitation of lower-quality food items, such as grasses, than in smaller-bodied Progonomys. The functional and ecophysiological aspects of Karnimata exploiting C4 grasses are concordant with their isotopic dietary preference relative to Progonomys. Lineage-specific selection was differentially greater in Karnimata, and a faster rate of shape change toward derived Karnimata facilitated inclusion of C4 grasses in the diet. Sympatric speciation in these clades is most plausibly explained by interspecific competition on resource utilization between the two, based on comparisons of our results with the carbon isotope data. Interspecific competition with Karnimata may have suppressed morphological innovation of the Progonomys clade. Pairwise analyses of morphological and carbon isotope data can uncover ecological causes of sympatric speciation and define functional adaptations of teeth to resources.

  12. Contribution to the systematics and zoogeography of the East-African Acomys spinosissimus Peters 1852 species complex and the description of two new species (Rodentia: Muridae)

    DEFF Research Database (Denmark)

    Verheyen, W.; Hulselmans, J.; Wendelen, W.

    2011-01-01

    We revised the taxonomic status of the putative Acomys spinosissimus complex based on the comparative study of specimen collections from Tanzania, Zambia, Zimbabwe, Mozambique, DR Congo and South Africa, by means of analysis of external morphology, craniometry, enzymes, mitochondrial DNA sequences....... transvaalensis) occurs further to the South (i.e. northern limit seemingly just north of the Limpopo River). The investigated populations north of the Zambezi River are morphologically and genetically distinct from A. spinosissimus and A. selousi. Based on this evidence, we described Acomys muzei sp. nov....... and Acomys ngurui sp. nov., each one occurring separately along one side of the Eastern Arc Mountains. Finally, we lacked sufficient information to describe a third new species from the area north of the Zambesi River...

  13. The phylogenetic position of "Acomyinae" (Rodentia, Mammalia) as sister group of a Murinae plus Gerbillinae clade : Evidence from the nuclear ribonuclease gene

    NARCIS (Netherlands)

    Dubois, JYF; Catzeflis, FM; Beintema, JJ

    1999-01-01

    The phylogenetic relationships of Acomys and Uranomys within Muridae were investigated using nuclear pancreatic ribonuclease A gene sequences. The various kinds of substitutions in the data matrix (15 taxa x 375 nucleotides) were examined for saturation, in order to apply a weighted parsimony approa

  14. Multiple interstitial ribosomal sites (NORs in the Brazilian squirrel Sciurus aestuans ingrami (Rodentia, Sciuridae with 2n = 40: an overview of Sciurus cytogenetics

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    Valéria Fagundes

    2003-01-01

    Full Text Available This is the first time the karyotype of the Brazilian squirrel Sciurusaestuans ingrami, with 2n = 40, is described. The karyotype of this species comprises 18 pairs of biarmed and one minute pair of acrocentric autosomes, a medium-sized submetacentric X and a medium-sized acrocentric Y. Four pairs have an interstitial secondary constriction, co-located with nucleolar organizer regions (NORs, identified by silver-staining technique and fluorescent in situ hybridization (FISH with ribosomal 18S/28S probes. The occurrence of multiple interstitial NORs is rare in rodents, and this is one of the few examples, identified by a molecular cytogenetics approach.

  15. Note on breeding and parental care behaviours of albino Hoary-bellied Squirrel Callosciurus pygerythrus (Rodentia: Sciuridae in Sibsagar District of Assam, India

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    G. Kalita

    2009-06-01

    Full Text Available A few individuals of albino Horay-bellied Squirrels along with normal gray individuals of Callosciurus pygerythrus have been observed in Sibsagar district of Assam, India. One albino female was studied in captivity. This paper presents our observations on the breeding behaviour and the parental care exhibited by the albino squirrel in captivity. The squirrel bred twice in captivity with a normal male of the same species. In both the periods, a single male baby with normal coat colour developed. Oral dose of vitamin E has been found helpful in the breeding of the studied squirrel species. The mother squirrel exhibited parental care by carrying her baby using her mouth, to a safer place during danger. However, the observed phenomenon is unlike that of the cat species. Some of the habitat ecology and feeding habits of the albino squirrels have also been studied, both in natural and in captive conditions.

  16. Infecção experimental de Calomys callosus (Rengger, 1830, (Cricetidae - Rodentia a quatro espécies de parasitos

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    Dalva A. Mello

    1980-12-01

    Full Text Available Neste trabalho foram estudados exemplares do roedor, Calomys callosus, nascidos em laboratório, a infecções experimentais com quatro parasitos: Plasmodium berghei, Leishmania mexicana amazonensis, Schistosoma mansoni e Hymenolepsis nana. A positividade das infecções foi de 80% para os três primeiros parasitos e 0 para H. nana. C. callosus é um roedor de excelente adaptação em laboratório e de fácil manuseio. Acredita-se que, de acordo com os resultados obtidos neste trabalho, este animal poderia ser um bom modelo experimental de laboratório para certos agentes patogênicos.Results of the experimental infections of the iaboratory bred rodent Calomys callosus are presented in th is paper. The following parasites were as infective agents: Plasmodium berghei, Leishmania mexicana amazonensis, Schistosoma mansoni and Hymenolepsis nana. C. callosus was refractory to H. nana while it has shown to be susceptible to the other three parasites. The infection rates for each one this parasites was 80 per cent. C. callosus has been maintained under laboratory conditions for six generations showing excellent adaptation and easy handling. It is believed that this animal can be used as laboratory experimental model for certain parasitic diseases.

  17. Panic-like defensive behavior but not fear-induced antinociception is differently organized by dorsomedial and posterior hypothalamic nuclei of Rattus norvegicus (Rodentia, Muridae

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    A.F. Biagioni

    2012-04-01

    Full Text Available The hypothalamus is a forebrain structure critically involved in the organization of defensive responses to aversive stimuli. Gamma-aminobutyric acid (GABAergic dysfunction in dorsomedial and posterior hypothalamic nuclei is implicated in the origin of panic-like defensive behavior, as well as in pain modulation. The present study was conducted to test the difference between these two hypothalamic nuclei regarding defensive and antinociceptive mechanisms. Thus, the GABA A antagonist bicuculline (40 ng/0.2 µL or saline (0.9% NaCl was microinjected into the dorsomedial or posterior hypothalamus in independent groups. Innate fear-induced responses characterized by defensive attention, defensive immobility and elaborate escape behavior were evoked by hypothalamic blockade of GABA A receptors. Fear-induced defensive behavior organized by the posterior hypothalamus was more intense than that organized by dorsomedial hypothalamic nuclei. Escape behavior elicited by GABA A receptor blockade in both the dorsomedial and posterior hypothalamus was followed by an increase in nociceptive threshold. Interestingly, there was no difference in the intensity or in the duration of fear-induced antinociception shown by each hypothalamic division presently investigated. The present study showed that GABAergic dysfunction in nuclei of both the dorsomedial and posterior hypothalamus elicit panic attack-like defensive responses followed by fear-induced antinociception, although the innate fear-induced behavior originates differently in the posterior hypothalamus in comparison to the activity of medial hypothalamic subdivisions.

  18. Panic-like defensive behavior but not fear-induced antinociception is differently organized by dorsomedial and posterior hypothalamic nuclei of Rattus norvegicus (Rodentia, Muridae)

    Science.gov (United States)

    Biagioni, A.F.; Silva, J.A.; Coimbra, N.C.

    2012-01-01

    The hypothalamus is a forebrain structure critically involved in the organization of defensive responses to aversive stimuli. Gamma-aminobutyric acid (GABA)ergic dysfunction in dorsomedial and posterior hypothalamic nuclei is implicated in the origin of panic-like defensive behavior, as well as in pain modulation. The present study was conducted to test the difference between these two hypothalamic nuclei regarding defensive and antinociceptive mechanisms. Thus, the GABAA antagonist bicuculline (40 ng/0.2 µL) or saline (0.9% NaCl) was microinjected into the dorsomedial or posterior hypothalamus in independent groups. Innate fear-induced responses characterized by defensive attention, defensive immobility and elaborate escape behavior were evoked by hypothalamic blockade of GABAA receptors. Fear-induced defensive behavior organized by the posterior hypothalamus was more intense than that organized by dorsomedial hypothalamic nuclei. Escape behavior elicited by GABAA receptor blockade in both the dorsomedial and posterior hypothalamus was followed by an increase in nociceptive threshold. Interestingly, there was no difference in the intensity or in the duration of fear-induced antinociception shown by each hypothalamic division presently investigated. The present study showed that GABAergic dysfunction in nuclei of both the dorsomedial and posterior hypothalamus elicit panic attack-like defensive responses followed by fear-induced antinociception, although the innate fear-induced behavior originates differently in the posterior hypothalamus in comparison to the activity of medial hypothalamic subdivisions. PMID:22437484

  19. Intense genomic reorganization in the genus Oecomys (Rodentia, Sigmodontinae: comparison between DNA barcoding and mapping of repetitive elements in three species of the Brazilian Amazon

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    Renan Gabriel Gomes Junior

    2016-09-01

    Full Text Available Oecomys Thomas, 1906 is one of the most diverse and widely distributed genera within the tribe Oryzomyini. At least sixteen species in this genus have been described to date, but it is believed this genus contains undescribed species. Morphological, molecular and cytogenetic study has revealed an uncertain taxonomic status for several Oecomys species, suggesting the presence of a complex of species. The present work had the goal of contributing to the genetic characterization of the genus Oecomys in the Brazilian Amazon. Thirty specimens were collected from four locations in the Brazilian Amazon and three nominal species recognized: Oecomys auyantepui (Tate, 1939, O. bicolor (Tomes, 1860 and O. rutilus (Anthony, 1921. COI sequence analysis grouped O. auyantepui, O. bicolor and O. rutilus specimens into one, three and two clades, respectively, which is consistent with their geographic distribution. Cytogenetic data for O. auyantepui revealed the sympatric occurrence of two different diploid numbers, 2n=64/NFa=110 and 2n=66/NFa=114, suggesting polymorphism while O. bicolor exhibited 2n=80/NFa=142 and O. rutilus 2n=54/NFa=90. The distribution of constitutive heterochromatin followed a species-specific pattern. Interspecific variation was evident in the chromosomal location and number of 18S rDNA loci. However, not all loci showed signs of activity. All three species displayed a similar pattern for 5S rDNA, with only one pair carrying this locus. Interstitial telomeric sites were found only in O. auyantepui. The data presented in this work reinforce intra- and interspecific variations observed in the diploid number of Oecomys species and indicate that chromosomal rearrangements have led to the appearance of different diploid numbers and karyotypic formulas.

  20. Cadmium and lead concentrations in Skrjabinotaenia lobata (Cestoda: Catenotaeniidae) and in its host, Apodemus sylvaticus (Rodentia: Muridae) in the urban dumping site of Garraf (Spain)

    Energy Technology Data Exchange (ETDEWEB)

    Torres, Jordi [Laboratori de Parasitologia, Departament de Microbiologia i Parasitologia Sanitaries, Facultat de Farmacia, Universitat de Barcelona, Av. Joan XXIII, sn, 08028 Barcelona (Spain)]. E-mail: jtorres@ub.edu; Peig, Jordi [Departament de Biologia Animal (Vertebrats), Facultat de Biologia, Universitat de Barcelona, Av. Diagonal 645, 08028 Barcelona (Spain); Eira, Catarina [Laboratori de Parasitologia, Departament de Microbiologia i Parasitologia Sanitaries, Facultat de Farmacia, Universitat de Barcelona, Av. Joan XXIII, sn, 08028 Barcelona (Spain); Borras, Miquel [Unitat de Toxicologia Experimental i Ecotoxicologia. Parc Cientific de Barcelona, C/Josep Samitier 1-5, 08028 Barcelona (Spain)

    2006-09-15

    The present study evaluates the parasitological model constituted by the wood mouse (Apodemus sylvaticus) and its intestinal cestode (Skrjabinotaenia lobata) as a potential bioindicator of Cd and Pb in the urban dumping site of Garraf near the city of Barcelona (Spain) and in Begues (reference site). Tissues and respective S. lobata specimens of 38 wood mice captured in Garraf and Begues were analyzed for Cd and Pb by means of ICP-MS. Higher cadmium levels in S. lobata were found only in respect to the muscular levels of their hosts. Nevertheless, lead levels were 8.5-, 53.2- and 81.4-fold higher in S. lobata than kidney, liver and muscle levels of A. sylvaticus from Garraf, respectively. Thus, the proposed model seems to be a promising bioindicator to evaluate environmental lead exposure in terrestrial habitats. In addition, all available data on lead bioaccumulation by cestode parasites of terrestrial mammals are generally discussed. - The parasitological model S. lobata/A. sylvaticus presents suitable features to be used as a bioindicator of lead pollution in terrestrial habitats.

  1. Estudio preliminar del esqueleto postcraneal del Muscardinus cyclopeus Agustí, Moyà-Solà & Pons-Moyà, 1982 (Mammalia, Rodentia, Myoxidae

    Directory of Open Access Journals (Sweden)

    Quintana Cardona, J.

    2015-06-01

    Full Text Available For the first time, the partial skeleton of the Pliocene Muscardinus cyclopeus is described from Punta Nati-3, located in the northwest of the municipality of Ciutadella de Menorca (Balearic Islands, western Mediterranean. Based on bone parameters it is shown that the size of Muscardinus cyclopeus is on overage 69% higher than that of Muscardinus avellanarius. The main features that distinguish M. cyclopeus from M. avellanarius are, among others: the relatively wider diameter of the proximal epiphysis of the ulna; the relatively shorter olecranon; the less marked concavity in the fovea of the proximal epiphysis of the radius; the relatively shorter ilium; the more symmetrical epicondyles of the distal femoral epiphysis; the relatively higher lateral epicondyle dorsoventrally, with a very flat ventral surface; and the relatively narrower tibia transversely. As a species evolved in an insular context, it is still very difficult to discern which of these characters are primitive and which are derived.Se describe, por primera vez, parte del esqueleto del muscardino gigante del Plioceno de Menorca, procedente del yacimiento 3 de Punta Nati, situado al noroeste del término municipal de Ciutadella de Menorca (Islas Baleares, Mediterráneo occidental. A partir de los parámetros óseos se ha podido constatar que Muscardinus cyclopeus muestra, de media, un tamaño un 69% superior al de Muscardinus avellanarius (Linnaeus, 1758. Entre las principales características óseas que diferencian M. cyclopeus de M. avellanarius cabe destacar, entre otras, el diámetro proporcionalmente más ancho de la epífisis proximal de la ulna, el olecranon proporcionalmente más corto, la fóvea de la epífisis proximal del radio con una concavidad menos marcada, el ilium proporcionalmente más corto, los epicóndilos de la epífisis distal del fémur más simétricos, el epicóndilo lateral proporcionalmente más alto en sentido dorso-ventral, con la superficie ventral muy aplanada y la tibia proporcionalmente más estrecha en sentido transversal. Al tratarse de una especie evolucionada en un contexto insular, resulta difícil dilucidar cuales son caracteres primitivos y caracteres derivados.

  2. Modulação da parasitemia e da resposta de anticorpos ao Trypanosoma cruzi pela ciclofosfamida em Calomys callosus (Rodentia, Cricetidae)

    OpenAIRE

    1992-01-01

    Calomys callosus a wild rodent, previously described as harboring Trypanosoma cruzi, has a low susceptibility to infection by this protozoan. Experiments were designed to evaluate the contribution of the immune response to the resistance to T. cruzi infection exhibited by C. calossus. Animals were submitted to injections of high (200 mg/kg body weight) and low (20 mg/kg body weight) doses of cyclophosphamide on days -1 or -1 and +5, and inoculated with 4 x 10³ T. cruzi on day O. Parasitemia, ...

  3. Cranial phenotypic variation in Meriones crassus and M. libycus (Rodentia, Gerbillinae, and a morphological divergence in M. crassus from the Iranian Plateau and Mesopotamia (Western Zagros Mountains

    Directory of Open Access Journals (Sweden)

    Fatemeh Tabatabaei Yazdi

    2014-06-01

    Full Text Available Jirds (genus Meriones are a diverse group of rodents, with a wide distribution range in Iran. Sundevall’s jird (Meriones crassus Sundevall, 1842 is one such species that shows a disjunct distribution, found on the Iranian Plateau and Western Zagros Mountains. Morphological differences observed between these two populations, however, lack quantitative support. Morphological differences between geographical populations of Meriones crassus were analysed and compared with those of the sympatric M. libycus. Similarities in the cranial morphology of these species were found, e.g. in a relatively large and inflated bulla. A two-dimensional geometric morphometric analysis was done on the skull of 275 M. crassus and 220 M. libycus from more than 70 different localities in their distribution range. Results confirm cranial differences between specimens of M. crassus from the Western Zagros and those from Africa and Arabia, mainly at the level of the relative size of the tympanic bulla, that were significantly correlated with the annual rainfall and elevation. Moreover, the study supports the hypothesis that the Western Zagros specimens are both a geographically and phenotypically distinct group compared to the other Iranian M. crassus specimens, suggesting that the former might be a distinct species.

  4. Mitochondrial DNA diversity and population structure of a forest-dependent rodent, Praomys taitae (Rodentia: Muridae) Heller 1911, in the fragmented forest patches of Taita Hills, Kenya

    DEFF Research Database (Denmark)

    Nyakaana, S.; Tumusiime, C.; Oguge, N.;

    2008-01-01

    The population genetic structure of the forest-dependent rodent, Praomys taitae, sampled from nine indigenous forest fragments sampled from nine indigenous forest fragments distributed over three ranges of the Taita Hills in Kenya, was determined using mitochondrial DNA (mtDNA) control region...

  5. Development of nine new microsatellite loci for the American beaver, Castor canadensis (Rodentia: Castoridae), and cross-species amplification in the European beaver, Castor fiber

    Science.gov (United States)

    Pelz-Serrano, K.; Munguia-Vega, A.; Piaggio, A.J.; Neubaum, M.; Munclinger, P.; PArtl, A.; van Riper, Charles; Culver, M.

    2009-01-01

    We developed nine new nuclear dinucleotide microsatellite loci for Castor canadensis. All loci were polymorphic, except for one. The number of alleles ranged from two to four and from five to 12 in populations from Arizona and Wisconsin, respectively. Average heterozygosity ranged from 0.13 to 0.86 per locus. Since cross-species amplification in Castor fiber was successful only in four loci, we tested also nine recently published C. canadensis loci in the Eurasian species. Eight of the published loci amplified; however, three were monomorphic. The number of alleles was lower in C. fiber than in C. canadensis at all loci tested. ?? 2009 Blackwell Publishing Ltd.

  6. Bartonella jaculi sp. nov., Bartonella callosciuri sp. nov., Bartonella pachyuromydis sp. nov. and Bartonella acomydis sp. nov., isolated from wild Rodentia.

    Science.gov (United States)

    Sato, Shingo; Kabeya, Hidenori; Fujinaga, Yuta; Inoue, Kai; Une, Yumi; Yoshikawa, Yasuhiro; Maruyama, Soichi

    2013-05-01

    Four novel strains of members of the genus Bartonella, OY2-1(T), BR11-1(T), FN15-2(T) and KS2-1(T), were isolated from the blood of wild-captured greater Egyptian jerboa (Jaculus orientalis), plantain squirrel (Callosciurus notatus), fat-tailed gerbil (Pachyuromys duprasi) and golden spiny mouse (Acomys russatus). All the animals were imported to Japan as pets from Egypt, Thailand and the Netherlands. The phenotypic characterization (growth conditions, incubation periods, biochemical properties and cell morphologies), DNA G+C contents (37.4 mol% for strain OY2-1(T), 35.5 mol% for strain BR11-1(T), 35.7 mol% for strain FN15-2(T) and 37.2 mol% for strain KS2-1(T)), and sequence analyses of the 16S rRNA genes indicated that those strains belong to the genus Bartonella. Sequence comparisons of gltA and rpoB genes suggested that all of the strains should be classified as novel species of the genus Bartonella. In phylogenetic trees based on the concatenated sequences of five loci, including the 16S rRNA, ftsZ, gltA and rpoB genes and the ITS region, and on the concatenated deduced amino acid sequences of three housekeeping genes (ftsZ, gltA and rpoB), all strains formed distinct clades and had unique mammalian hosts that could be discriminated from other known species of the genus Bartonella. These data strongly support the hypothesis that strains OY2-1(T), BR11-1(T), FN15-2(T) and KS2-1(T) should be classified as representing novel species of the genus Bartonella. The names Bartonella jaculi sp. nov., Bartonella callosciuri sp. nov., Bartonella pachyuromydis sp. nov. and Bartonella acomydis sp. nov. are proposed for these novel species. Type strains of Bartonella jaculi sp. nov., Bartonella callosciuri sp. nov., Bartonella pachyuromydis sp. nov. and Bartonella acomydis sp. nov. are OY2-1(T) ( = JCM 17712(T) = KCTC 23655(T)), BR11-1(T) ( = JCM 17709(T) = KCTC 23909(T)), FN15-2(T) ( = JCM 17714(T) = KCTC 23657(T)) and KS2-1(T) ( = JCM 17706(T) = KCTC 23907(T)), respectively.

  7. Variation in the helminth community structure of Thrichomys pachyurus (Rodentia: Echimyidae) in two sub-regions of the Brazilian Pantanal: the effects of land use and seasonality.

    Science.gov (United States)

    Simões, R; Gentile, R; Rademaker, V; D'Andrea, P; Herrera, H; Freitas, T; Lanfredi, R; Maldonado, A

    2010-09-01

    The Pantanal is a large ecosystem located in South America. This preserved area is seasonally flooded due to abundant rainfall during the summer and the subsequent overflow of the Paraguai River. In this paper, we examine the helminth community structure in the wild rodent Thrichomys pachyurus during the wet and dry seasons in two locations of the preserved and cattle ranching areas in the Southern Pantanal. We identified 12 species of helminth, and, although we did not find any differences in species richness between locations within the Pantanal, we found that richness was higher during the wet season. Helminth species were largely aggregated in both farm locations and during seasons. The most common helminth species were more abundant during the dry season than during the wet season, which may have been due to the increased habitat availability and rodent population increase. The intensity of the infection also followed the same pattern for most helminths. The trichostrongylids (Heligmostrongylus crucifer, H. almeidai and Pudica cercomysi) were dominant at both farm locations. The land use of each area was not correlated with helminth diversity. However, species composition of the helminth community of T. pachyurus differed between locations and may be correlated with environmental differences between the habitats. The seasonality of the Pantanal was highly correlated with helminth parasitism in T. pachyurus.

  8. Doğu Karadeniz bölgesinde yayılış gösteren Apodemus Kaup, 1829 (Mammalia: Rodentia) cinsinin morfolojik analizi

    OpenAIRE

    2007-01-01

    Bu çalışmada Doğu Karadeniz bölgesinden örneklenen  Apodemus cinsine ait 126 örneğin  kafatası ve postları değerlendirildi. Diş, kafası ve post örneklerinin yapılan morfolojik analizleri sonucunda bu cinse ait dört tür; Apodemus uralensis, Apodemus flavicollis, Apodemus iconicus ve Apodemus mystacinus  belirlendi. Bu türlerden A. flavicollis ve A. iconicus morfolojik açıdan büyük benzerlik gösterirken, A. uralensis’ inde bu iki türe olan yakınlığı yapılan m...

  9. Four new coccidia (Apicomplexa: Eimeriidae) from the Plateau zokor, Myospalax baileyi Thomas (Rodentia: Myospalacinae), a subterranean rodent from Haibei area, Qinghai Province, China.

    Science.gov (United States)

    Cao, Yi-Fan; Nie, Xu-Heng; Zhang, Tong-Zuo; Du, Shou-Yang; Duszynski, Donald W; Bian, Jiang-Hui

    2014-02-01

    Thirty-eight faecal samples from the Plateau zokor, Myospalax baileyi Thomas, collected in the Haibei Area, Qinghai Province, China, were examined for the presence of coccidia (Apicomplexa: Eimeriidae). Seventeen of 38 faecal samples (44.7%) were found to contain coccidian oöcysts representing four new species of Eimeria Schneider, 1875, and four of 17 (23.5%) infected zokors were concurrently infected with two or three of these eimerian species. The sporulated oöcysts of Eimeria myospalacensis n. sp. are ovoidal, 9.5-17.0 × 8.0-13.0 (mean 13.0 × 10.4) μm; a polar granule is present, oöcyst residuum is absent; sporocysts are ovoidal, 4.5-7.5 × 3.0-5.0 (mean 6.3 × 4.2) μm and have both a Stieda body and residuum. Oöcysts of Eimeria fani n. sp. are ellipsoidal to cylindroidal, 12.5-16.0 × 8.0-11.0 (mean 14.6 × 9.9) μm; a polar granule is present, but micropyle and residuum are lacking; sporocysts are ovoidal, 4.5-7.5 × 3.0-5.3 (mean 6.7 × 4.4) μm; a residuum and a Steida body are present. Oöcysts of Eimeria baileyii n. sp. are ellipsoidal, 15.0-23.0 × 12.0-18.0 (mean 18.2 × 13.7) μm; a polar granule is present but oöcyst residuum is absent; sporocysts are ovoidal, 8.0-11.0 × 5.0-7.0 (mean 9.5 × 5.9) μm and have both a Stieda body and residuum. Oöcysts of Eimeria menyuanensis n. sp. are ovoidal, 12.5-21.0 × 11.0-18.0 (mean 17.1 × 14.6) μm, with a distinct micropyle c.2.5 μm wide; a polar granule is present but a residuum is absent; sporocysts are ovoidal, 8.0-12.0 × 5.0-7.0 (mean 10.2 × 6.4) μm, and have both a Stieda body and residuum.

  10. The role of chromosomal rearrangements and geographical barriers in the divergence of lineages in a South American subterranean rodent (Rodentia: Ctenomyidae: Ctenomys minutus).

    Science.gov (United States)

    Lopes, C M; Ximenes, S S F; Gava, A; de Freitas, T R O

    2013-10-01

    Identifying factors and the extent of their roles in the differentiation of populations is of great importance for understanding the evolutionary process in which a species is involved. Ctenomys minutus is a highly karyotype-polymorphic subterranean rodent, with diploid numbers ranging from 42 to 50 and autosomal arm numbers (ANs) ranging from 68 to 80, comprising a total of 45 karyotypes described so far. This species inhabits the southern Brazilian coastal plain, which has a complex geological history, with several potential geographical barriers acting on different time scales. We assessed the geographical genetic structure of C. minutus, examining 340 individuals over the entire distributional range and using information from chromosomal rearrangements, mitochondrial DNA (mtDNA) sequences and 14 microsatellite loci. The mtDNA results revealed seven main haplogroups, with the most recent common ancestors dating from the Pleistocene, whereas clustering methods defined 12 populations. Some boundaries of mtDNA haplogroups and population clusters can be associated with potential geographical barriers to gene flow. The isolation-by-distance pattern also has an important role in fine-scale genetic differentiation, which is strengthened by the narrowness of the coastal plain and by common features of subterranean rodents (that is, small fragmented populations and low dispersal rates), which limit gene flow among populations. A step-by-step mechanism of chromosomal evolution can be suggested for this species, mainly associated with the metapopulation structure, genetic drift and the geographical features of the southern Brazilian coastal plain. However, chromosomal variations have no or very little role in the diversification of C. minutus populations.

  11. Hepatic parasitosis in two wood mice, Apodemus sylvaticus (Rodentia: Muridae), due to Aonchotheca annulosa (Nematoda: Trichuridae), and Eucoleus bacillatus (Nematoda: Trichuridae). Erratic parasitism or post mortem migration?

    Science.gov (United States)

    Debenedetti, Ángela L; Sáez-Durán, Sandra; Sainz-Elipe, Sandra; Galán-Puchades, Maria Teresa; Fuentes, Màrius V

    2014-10-01

    Aonchotheca annulosa and Eucoleus bacillatus are two capillariin nematodes parasitizing the intestinal and stomach mucosa, respectively, of various rodent species, and two, among others, component species of the helminth fauna of the wood mouse, Apodemus sylvaticus. A capillariin each was found in the liver parenchyma of two wood mice in a post-fire regeneration enclave in Serra Calderona Natural Park (Valencian Community, Spain). Due to their location, the preliminary identification of the helminths corresponded to Calodium hepaticum, a hepatic capillariin with rodents as its main host. So far, this species had never been found in Serra Calderona. To verify the preliminary identification, a comparative morphometric study between the specimens from Serra Calderona and a preserved individual of C. hepaticum from another enclave was carried out. Morphometric analysis revealed that the adult helminth as well as the eggs found in the liver of the first mouse belonged to A. annulosa, whereas the second one was identified as a male E. bacillatus. Moreover, the liver from both hosts showed a visible pathology, being the consequence of aberrant migration of the parasites. This is the first evidence that A. annulosa and E. bacillatus may migrate erratically and thus produce ectopic foci in other organs.

  12. Infecção experimental de Calomys callosus (Rengger, 1830, (Cricetidae - Rodentia a quatro espécies de parasitos

    Directory of Open Access Journals (Sweden)

    Dalva A. Mello

    1980-12-01

    Full Text Available Neste trabalho foram estudados exemplares do roedor, Calomys callosus, nascidos em laboratório, a infecções experimentais com quatro parasitos: Plasmodium berghei, Leishmania mexicana amazonensis, Schistosoma mansoni e Hymenolepsis nana. A positividade das infecções foi de 80% para os três primeiros parasitos e 0 para H. nana. C. callosus é um roedor de excelente adaptação em laboratório e de fácil manuseio. Acredita-se que, de acordo com os resultados obtidos neste trabalho, este animal poderia ser um bom modelo experimental de laboratório para certos agentes patogênicos.

  13. Two New Species of Demodex (Acari: Demodecidae) with a Redescription of Demodex musculi and Data on Parasitism in Mus musculus (Rodentia: Muridae).

    Science.gov (United States)

    Izdebska, Joanna N; Rolbiecki, Leszek

    2015-07-01

    This article describes two new skin mite species found on the house mouse Mus musculus L., 1758. Demodex marculus sp. nov. is a very small demodecid mite (adult stages, on average, 99 µm in length) found in mouse skin in the abdomen, back, limbs, and anal area. It is characterized by relatively large bossing hammer-shaped supracoxal spines, embedded in the trapezoidal gnathosoma. Demodex fusiformis sp. nov., in turn, is a little larger (adult stages on average 111 µm in length), with a small oval gnathosoma equipped with fine, knob-like supracoxal spines. It was found in the skin of abdomen, back, and limbs. Moreover, Demodex musculi (Oudemans, 1897) was redescribed, which is small demodecid mite (adult stages on average 142 µm in length) and characterized by relatively large morphological variation and considerable sexual dimorphism. The characteristic feature of this species is the strongly elongated and rectangular gnathosoma equipped with very large wedge-shaped supracoxal spines. D. musculi was found in the skin of various, haired regions of the mice body (head, neck, abdomen, back, limbs, genital-anal region, and tail). Moreover, one more demodecid mite was found in the skin of the examined mice, it was Demodex flagellurus Bukva, 1985, which was found only in the genital area. Overall infection of Mus musculus L. by all species of Demodex was with the prevalence of 100%, mean intensity of 24.0, and range of intensity of 1-109. Despite high infection levels, no symptoms of parasitosis were observed in the hosts.

  14. Demodectic mites of the brown rat Rattus norvegicus (Berkenhout, 1769) (Rodentia, Muridae) with a new finding of Demodex ratticola Bukva, 1995 (Acari, Demodecidae).

    Science.gov (United States)

    Izdebska, Joanna N; Rolbiecki, Leszek

    2012-01-01

    Demodex ratticola was recorded in the brown rat Rattus norvegicus from northern Poland. It is a skin mite specific to this host, previously recorded only in the Czech Republic. D. ratticola was found at a prevalence 65.0% and mean intensity 12.7 in skin samples taken from the regions of lips, nose and chin. Furthermore, three other species from the family of Demodecidae were recorded, including Demodex nanus found in skin samples from different parts of the body and characterised by the highest parameters of infestation (100.0%, 25.2), D. ratti (50.0%, 3.3) found in the head skin and D. norvegicus (30.0%, 3.5) found in the genital and anal regions. The identified demodectic mites did not cause any pathological symptoms in rats.

  15. A new species of Demodex (Acari: Demodecidae) with data on topical specificity and topography of demodectic mites in the striped field mouse Apodemus agrarius (Rodentia: Muridae).

    Science.gov (United States)

    Izdebska, Joanna N; Rolbiecki, Leszek

    2013-11-01

    This article describes morphological characteristics and the occurrence of Demodex gracilentus sp. nov., which was found in the striped field mouse Apodemus agrarius (Pallas, 1771) in the skin of vibrissae area. D. gracilentus occurred in 36.7% of the rodents examined. D. gracilentus is a relatively large representative of the genus (adult stages on average 292 microm in length), a slender, elongated body; characteristic feature of these mites are conical supracoxal spines on dorsal side of gnathosoma, palps with asymmetric, forked triple spines on palptarsus, and the presence of rhomboidal opisthosomal organ. So far, the occurrence of three specific representatives of the family Demodecidae has been demonstrated in A. agrarius: Demodex apodemi (Hirst, 1918) (= Demodex arvicolae apodemi Hirst, 1918), Demodex agrarii Bukva, 1994, and Demodex huttereri Mertens, Lukoschus et Nutting, 1983. The first one is related to common hair follicles, especially in the skin of the head, while the next one inhabits the external auditory meatus, and the last one occurs in the meibomian glands of the eyelids.

  16. A new species of the genus Demodex Owen, 1843 (Acari: Demodecidae) from the ear canals of the house mouse Mus musculus L. (Rodentia: Muridae).

    Science.gov (United States)

    Izdebska, Joanna N; Rolbiecki, Leszek

    2015-06-01

    A new species Demodex conicus n. sp. is described based on adult and juvenile stages from the ear canals of the house mouse Mus musculus L. in Poland. The new species is most similar to D. auricularis Izdebska, Rolbiecki & Fryderyk, 2014 from the ear canals of the wood mouse Apodemus sylvaticus (L.), but differs in the following features: the gnathosoma is triangular, the supracoxal spines (setae elc.p) are conical, the spines on the terminal segment of palp are four, the striation on opisthosoma is fine but dense, the vulva is located at a distance of c.17 µm from posterior level of legs IV, and the male genital opening is located at the level of legs I. The differences also relate to body size and proportions, female D. conicus n. sp. being, on average slightly larger, and male significantly larger than D. auricularis. Males of the new species also have longer and more massive opisthosoma than males of D. auricularis. Demodex conicus n. sp. was found in 17.5% of the mice studied from different locations in Poland.

  17. Extinction of endemic vertebrates on islands : The case of the giant rat Canariomys bravoi (Mammalia, Rodentia) on Tenerife (Canary Islands, Spain)

    NARCIS (Netherlands)

    Bocherens, Herve; Michaux, Jacques; Talavera, Francisco Garcia; Van der Plicht, Johannes

    2006-01-01

    Fossil bone collagen (14)C dating and delta(13)C and delta(15)N isotopic measurements of the rodent Canariomys bravoi from Tenerife (Canary Islands.. Spain) were used to test two different hypotheses about the causes of extinctions of endemic vertebrates on islands. climate versus humans. For the Te

  18. A influência do tempo de permanência em cativeiro sobre o comportamento: Um estudo de caso com Trinomys yonenagae (Rodentia: Echimyidae)

    OpenAIRE

    Alves, Ilai Moradillo Mello

    2013-01-01

    A utilização de animais silvestres em experimentos é freqüentemente precedida pela aclimatação ao cativeiro, de modo a permitir que eles se habituem às condições nas quais serão mantidas e nas quais serão realizados os experimentos. No entanto, nem sempre essa habituação pode ser benéfica no que diz respeito à qualidade dos dados coletados de modo que o comportamento, a fisiologia e o bem-estar dos animais podem ser fortemente afetados por essa aclimatação. Apesar de os roedores sere...

  19. Respuesta de Sigmodon hispidus (Rodentia: Muridae) a la inoculación experimental con el virus de la estomatitis vesicular serotipo New Jersey

    OpenAIRE

    Rodriguez, Julia; Dolz, Gaby; Jimenez, Ana Eugenia; Herrero, Marco Vinicio; Salman, Mo

    2013-01-01

    Se han reportado anticuerpos contra el Virus de Estomatitis Vesicular, serotipo New Jersey (VEV-NJ), en Sigmodon hispidus (rata algodonera) libres en Costa Rica. Con el fin de evaluar su respuesta ante el virus y su potencial rol como reservorio, treinta ratas algodoneras adultas, criadas en laboratorio, fueron inoculadas experimentalmente con 107 TCID50/ml VEV-NJ de la siguiente manera: 10 vía subcutánea (grupo A), 10 por abrasión oral (grupo B) y 10 por vía intranasal (grupo C). Se incluyer...

  20. [Annual follow-up of the gastrointestinal parasitosis of the tepezcuintle, Agouti paca (Rodentia: Agoutidae) in captivity in the Mexican tropic].

    Science.gov (United States)

    Ramírez-Herrera, O; Rodríguez-Vivas, R I; Montes-Pérez, R; Torres-Acosta, J F

    2001-01-01

    Previous reports showed that the tepezcuintle (Agouti paca) is commonly infested by gastrointestinal parasites (GIP), mainly Eucoccidiida and helminths. However, there is no available information on the frequency of those parasites and their faecal egg excretions at different moments during the year. These information would provide a valuable baseline for the establishment of control strategies against GIP in tepezcuintles under captivity. The objectives of the present study were to determine the prevalence of GIP orders and genera that infest tepezcuintles under captivity and, to describe the dynamics of faecal egg and oocyst excretion in a year. Ten tepezcuintles were sampled (faeces) twice every month for twelve months. The faecal samples were processed by the flotation and McMaster techniques. Two orders of parasites were determined: Strongylida and Eucoccidiida. Two genera of nematodes were also determined: Strongyloides and Trichuris. The prevalence of Strongylida eggs, Eucoccidiida oocysts and Trichuris sp. eggs reached 10-20% of animals in certain months. The most important genus was Strongyloides, found in 60 to 100% of the animals year round. The average excretion of eggs in the group was 45 to 372 eggs per gram. Tepezcuintles kept under captivity in Yucatan are parasited with Strongyloides sp throughout the year, but only occasionally had oocysts of Eucoccidiida and eggs of Strongylida and Trichuris sp.

  1. Efectividad biológica de seis rodenticidas utilizados para el control de Sigmodon hispidus (Rodentia: Cricetidae) en caña de azúcar

    OpenAIRE

    2012-01-01

    Los estudios relacionados con el control químico de la rata algodonera o cañera son escasos, por lo que es difícil tener acceso a la información. Desafortunadamente en México los rodenticidas se aplican con base en recomendaciones generales, por lo que es importante evaluar la efectividad de estos productos en condiciones controladas y de campo. El objetivo en este trabajo fue conocer la efectividad biológica de los rodenticidas: warfarina®, difacinona®, brodifacum®, f...

  2. Life in Burrows Channelled the Morphological Evolution of the Skull in Rodents: the Case of African Mole-Rats (Bathyergidae, Rodentia)

    OpenAIRE

    2015-01-01

    International audience; African mole-rats are fossorial rodents that consist of five chisel-tooth digging genera (Heterocephalus, Heliophobius, Georychus, Fukomys, and Cryptomys) and one scratch digger (Bathyergus). They are characterized by striking physiological, morphological, and behavioral adaptations intimately related to their subterranean life. The influence of their mode of life in shaping the cranial morphology has yet to be evaluated in comparison to other Ctenohystrica, especially...

  3. Lineage-specific responses of tooth shape in murine rodents (murinae, rodentia) to late Miocene dietary change in the Siwaliks of Pakistan.

    Science.gov (United States)

    Kimura, Yuri; Jacobs, Louis L; Flynn, Lawrence J

    2013-01-01

    Past ecological responses of mammals to climate change are recognized in the fossil record by adaptive significance of morphological variations. To understand the role of dietary behavior on functional adaptations of dental morphology in rodent evolution, we examine evolutionary change of tooth shape in late Miocene Siwalik murine rodents, which experienced a dietary shift toward C4 diets during late Miocene ecological change indicated by carbon isotopic evidence. Geometric morphometric analysis in the outline of upper first molars captures dichotomous lineages of Siwalik murines, in agreement with phylogenetic hypotheses of previous studies (two distinct clades: the Karnimata and Progonomys clades), and indicates lineage-specific functional responses to mechanical properties of their diets. Tooth shapes of the two clades are similar at their sympatric origin but deviate from each other with decreasing overlap through time. Shape change in the Karnimata clade is associated with greater efficiency of propalinal chewing for tough diets than in the Progonomys clade. Larger body mass in Karnimata may be related to exploitation of lower-quality food items, such as grasses, than in smaller-bodied Progonomys. The functional and ecophysiological aspects of Karnimata exploiting C4 grasses are concordant with their isotopic dietary preference relative to Progonomys. Lineage-specific selection was differentially greater in Karnimata, and a faster rate of shape change toward derived Karnimata facilitated inclusion of C4 grasses in the diet. Sympatric speciation in these clades is most plausibly explained by interspecific competition on resource utilization between the two, based on comparisons of our results with the carbon isotope data. Interspecific competition with Karnimata may have suppressed morphological innovation of the Progonomys clade. Pairwise analyses of morphological and carbon isotope data can uncover ecological causes of sympatric speciation and define functional adaptations of teeth to resources.

  4. Parasitism of two zoonotic reservoirs Dasyprocta leporina and D. fuliginosa (Rodentia from Amazonas, with Trichostrongylina nematodes (Heligmonellidae: description of a new genus and a new species

    Directory of Open Access Journals (Sweden)

    Alessandra Queiroga Gonçalves

    2007-09-01

    Full Text Available A new genus and a new species of Heligmonellidae nematodes are described parasiting the stomach of three agoutis (two Dasyprocta fuliginosa and one D. leporina captured in the middle and high Negro river microregion, state of Amazonas, Brazil. The new genus, as well as its type-species, are closely related to the trichostrongylids included in Fuellebornema, particularly on what concerns the pattern of the caudal bursa, but differing from them by the characteristics of the synlophe, that presents a poorly developed carene, when compared to the referred number of body ridges in Freitastrongylus n. gen. and consequently in F. angelae n. sp.,in which the ridges are well developed and the carene at mid-body has a similar size when compared to the ridge situated in front of the right field (ridge no. 5. Caudal bursa is of the type 1-4, with rays 9 shorter than rays 10, with a very long genital cone.

  5. [A modular approach to studying of fluctuating asymmetry of complex morphological structures in rodents with the mandible of the bank vole (Clethrionomys glareolus, Arvicolinae, Rodentia) as an example].

    Science.gov (United States)

    Ialkovskaia, L É; Borodin, A V; Fominykh, M A

    2014-01-01

    The expediency of a modular approach to estimating fluctuating asymmetry (FA) of complex morphological structures was shown using the mandible of the bank vole (Clethrionomys glareolus Schreber, 1780) as an example. FA of the shape of two mandibular regions (modules) defined developmentally and functionally, was assessed by means of geometric morphometrics. The differences between mandibular regions in the FA levels were found for both individual landmarks and integral indices of asymmetry. Regardless of age, gender or sampling year, FA estimates obtained for posterior region including part of the ramus and processes were higher than those for anterior region including the diastemal area. The results suggest that modularity of complex morphological structures should be taken into account when analyzing FA.

  6. Biochemical Changes of the Organism of Apodemus flavicollis (Rodentia: Muridae Under Conditions of Environmental Anthropogenic Pollution by Heavy Metals in Northern Areas of Ukraine

    Directory of Open Access Journals (Sweden)

    Svitlana V. Zadyra

    2014-04-01

    Full Text Available The present research dedicates the integral assessment of biochemistry indexes of nature populations of rodents under conditions of environment pollution by heavy metals. The raised content in soils of mobile forms Pb, Cd, Cr, Ni and Co was revealed оn distance of 500 m to the South-West from Tripillya Thermal Power Plant (Kyiv region, Ukraine. That’s considerably (3–5 times exceeds levels for territory of Kaniv Nature Reserve (Cherkassy region, Ukraine. Territory of National Nature Park “Holosiivsky” (Kyiv, Ukraine characterized by rather increased content of active form of researched heavy metals especially Pb. Increase of the concentration of diene conjugates (3–7 times and malonic dialdehyde (2–4 times in yellow-necked mouse liver (Apodemus flavicollis of under pollution by heavy metals has been discovered. Insignificant increasing of content of Schiff basis in liver cells of rodents in region of impact of Tripillya TPP (in 2 times in spring and in summer, in autumn – in 2.5 times was detected. Seasonal dynamics of the maintenance of lipid peroxidation has been revealed. The registered changes of biochemical indicators testify about presence ecological-biochemical stress in an organism of the yellow-necked mouse in the district of influence of Tripillya TPP.

  7. Chromosomal evolution of Arvicolinae (Cricetidae, Rodentia). I. The genome homology of tundra vole, field vole, mouse and golden hamster revealed by comparative chromosome painting.

    Science.gov (United States)

    Sitnikova, Natalia A; Romanenko, Svetlana A; O'Brien, Patricia C M; Perelman, Polina L; Fu, Beiyuan; Rubtsova, Nadezhda V; Serdukova, Natalya A; Golenishchev, Feodor N; Trifonov, Vladimir A; Ferguson-Smith, Malcolm A; Yang, Fengtang; Graphodatsky, Alexander S

    2007-01-01

    Cross-species chromosome painting has become the mainstay of comparative cytogenetic and chromosome evolution studies. Here we have made a set of chromosomal painting probes for the field vole (Microtus agrestis) by DOP-PCR amplification of flow-sorted chromosomes. Together with painting probes of golden hamster (Mesocricetus auratus) and mouse (Mus musculus), the field vole probes have been hybridized onto the metaphases of the tundra vole (Microtus oeconomus). A comparative chromosome map between these two voles, golden hamster and mouse has been established based on the results of cross-species chromosome painting and G-banding comparisons. The sets of paints from the field vole, golden hamster and mouse identified a total of 27, 40 and 47 homologous autosomal regions, respectively, in the genome of tundra vole; 16, 41 and 51 fusion/fission rearrangements differentiate the karyotype of the tundra vole from the karyotypes of the field vole, golden hamster and mouse, respectively.

  8. Causes and consequences of change rates in the habitat of the threatened tropical porcupine, Sphiggurus mexicanus (Rodentia: Erethizontidae) in Oaxaca, Mexico: implications for its conservation.

    Science.gov (United States)

    Lorenzo, Consuelo; Sántiz, Eugenia C; Navarrete, Darío A; Bolaños, Jorge

    2014-12-01

    Land use changes by human activities have been the main causes of habitats and wildlife population degradation. In the Tehuantepec Isthmus in Oaxaca, the tropical habitat of the porcupine Sphiggurus mexicanus has been subject to vegetation and land use changes, causing its reduction and fragmentation. In this study, we estimated vegetation cover and land use (δn) change rates and assessed habitat availability and potential cor- ridors for possible porcupine movements to avoid its isolation. In the study area, the type of vegetation with the most change rate value was the savanna (δn = -2.9), transformed into induced grasslands. Additionally, we have observed the porcupine (since 2011) in semi-deciduous (δn = -0.87) and tropical dry (δn = -0.89) forests that have been transformed in temporal agriculture and mesquite and induced grasslands. The vegetation inhabited by the porcupine resulted in recording a total of 64 plant species (44 trees, nine vines, seven herbs, four shrubs), of which the vine Bunchosia lanceolata showed the highest importance value (41.85) followed by the trees Guazuma ulmifolia (22.71), Dalbergia glabra (18.05), and Enterolobium cyclocarpum (17.02). The habitat evaluation and potential corridor analysis showed that only 1 501.93ha could be considered as suitable habitats with optimum structural conditions (coverage, surface, and distances to transformed areas) to maintain viable populations of S. mexicanus, and 293.6 ha as corridors. An increasing destruction of the porcupines' habitat has been observed in the study area due to excessive logging, and actions for this species and its habitat conserva- tion and management have to be taken urgently.

  9. Planetary Asteroid Defense Study: Assessing and Responding to the Natural Space Debris Threat

    Science.gov (United States)

    1995-04-01

    1134-1135. 35 Ibid, 1134. 36 Ibid, 1134. 76 37 Kerry A. Emanuel, Kevin Speer, Richard Rotunno, Ramesh Srivastava and Mario Molina , Hyper canes: A...Speer, Richard Rotunno, Ramesh Srivastava and Mario Molina . Hypercanes: A Possible Link In Global Extinction Scenarios. Center for Meteorology and

  10. 78 FR 37520 - Order Denying Export Privileges

    Science.gov (United States)

    2013-06-21

    ... Bureau of Industry and Security Order Denying Export Privileges In the Matter of: Placido Molina, Jr... convicted of violating Section 38 of the Arms Export Control Act (22 U.S.C. 2778 (2006 & Supp. IV 2010)) (``AECA''). Specifically, Molina was convicted of knowingly and willfully attempting to export and...

  11. Health Issues in the Latino Community.

    Science.gov (United States)

    Aguirre-Molina, Marilyn, Ed.; Molina, Carlos W., Ed.; Zambrana, Ruth Enid, Ed.

    This collection of papers includes 6 parts. Part 1, "Latino Populations in the United States," includes: (1) "Latino Health Policy: Beyond Demographic Determinism" (Angelo Falcon, Marilyn Aguirre-Molina, and Carlos W. Molina); (2) "Latino Health Status" (Olivia Carter-Pokras and Ruth Enid Zambrana); and (3)…

  12. Free and total testosterone levels in field males of Octodon degus (Rodentia, Octodontidae: accuracy of the hormonal regulation of behavior Niveles de testosterona libre y totales en machos silvestres de Octodon degus (Rodentia, Octodontidae: exactitud de la regulación hormonal del comportamiento

    Directory of Open Access Journals (Sweden)

    MAURICIO SOTO- GAMBOA

    2005-06-01

    Full Text Available Animals exhibit continuous seasonal changes in physiological, morphological and behavioral traits associated to their natural annual cycles. One of the most important changes in the organism occurs at the initiation of breeding season. In males these changes include activation of spermatogenesis, enhance of sexual secondary characters and an increase of aggressiveness. All of theses changes are basically regulated by testosterone, but the physiological basis of this testosterone regulation and the effective hormone proportion that acts in target tissues are unknown. In this work I evaluated the relationship between total testosterone, free testosterone associated to aggressive behavior in wild males of Octodon degus. I compared hormonal levels and aggressive behavior during pre, middle and post breeding periods. Results showed that behavioral aggressiveness was correlated with both total and free testosterone in June, during the beginning of breeding season, but not at other times. Results also indicated a lack of relationship between free and total testosterone in most of breeding period. I discuss the importance of this behavior-hormonal regulation (determined by free testosterone and the physiological importance of this mechanism to the organismLos animales presentan variaciones estacionales continuas que incluyen cambios fisiológicos, morfológicos y conductuales, asociados al ciclo anual. Estos cambios generalmente están activados por factores endógenos o exógenos, pero son regulados por el sistema endocrino de organismo. Uno de los cambios más importantes ocurre en el inicio del periodo reproductivo. Durante este periodo los machos presentan cambios asociados a la producción de esperatozoides, exacerbación de caracteres sexuales secundarios y un aumento de la agresividad. Todos estos cambios son regulados en parte por los niveles de testosterona, sin embargo, los mecanismos fisiológicos de esta regulación son desconocidos. En este trabajo evalué la relación que existe entre los niveles de testosterona libre y totales, y examiné su posible asociación con los niveles de agresividad en machos de una población natural de Octodon degus. Mis resultados indicaron que la agresividad se correlaciona directamente con los niveles de testosterona libre y totales solo durante el mes de junio, al inicio del periodo reproductivo, pero no durante el resto del ciclo reproductivo de esta especie. Esto indicaría que la agresividad solo se correlaciona con los niveles de testosterona libre ya que en el medio y el final del periodo reproductivo los niveles de testosterona se mantienen altos sin que se manifiesten dichas conductas. Finalmente, discuto la importancia de la regulación fina de la conducta determinada por la testosterona libre y la importancia fisiológica de este mecanismo de regulación dentro del organismo

  13. Endoparasitos em cobaias (Cavia porcellus (Mammalia, Rodentia, Caviidae provenientes de biotérios de criação e experimentação do município do Rio de Janeiro, Brasil Endoparasites in guinea pigs (Cavia porcellus (Mammalia, Rodentia, Caviidae from breeding and experimentation animal housing of the municipality of Rio de Janeiro, Brazil

    Directory of Open Access Journals (Sweden)

    Luciana Casartelli Alves

    2007-10-01

    Full Text Available Foi realizado um levantamento sobre a prevalência e intensidade de infecção de endoparasitos em cobaias convencionais de linhagem Short Hair provenientes de biotérios de criação (A e experimentação (B do município do Rio de Janeiro, Brasil, avaliando-se a eficácia das medidas de prevenção entre eles. Para a realização do estudo, utilizou-se exame direto de mucosa e do conteúdo intestinal, a técnica de tricromo de WHEATLEY e exames coproparasitológicos pelas técnicas de Ritchie e Kinyoun. Os parasitos encontrados através da técnica de exame direto da mucosa e do conteúdo intestinal e de tricromo de WHEATLEY com as respectivas prevalências foram: Balantidium sp. (78%, Cyathodinium sp. (68%, Eimeria caviae (38%, Paraspidodera uncinata (34% e Giardia muris (24%. Nos exames de fezes realizados pelas técnicas de Ritchie e Kinyoun, foram encontrados os seguintes parasitos com as respectivas prevalências no biotério A: E. caviae (74%, Balantidium sp. (68%, Cyathodinium sp. (68% e Cryptosporidium sp. (5%. No biotério B, observou-se: E. caviae (58%, Balantidium sp. (42%, Cyathodinium sp. (25% e G. muris (8%. A alta prevalência de endoparasitos nos biotérios sugere a necessidade de se rever a eficácia das barreiras sanitárias adotadas.This paper discusses the prevalence and intensity of infection of endoparasites in conventionally maintained Short Hair guinea pigs colonies from a breeding (A and an experimental (B facilities in Rio de Janeiro, Brazil. It also evaluates the efficacy of the methods of prevention adopted by both facilities. The search of parasites was performed by direct examination of intestinal mucosa and its contents, WHEATLEY's trichrome method and coproparasitological examinations by Ritchie's and Kinyoun's techniques. The prevalences of endoparasites found throught direct examination of intestinal mucosa and its contents were: Balantidium sp. (78%, Cyathodinium sp. (68%, Eimeria caviae (38%, Paraspidodera uncinata (34% and Giardia muris (24%. The prevalences of endoparasites found throught Ritchie's and Kinyoun's techniques in facility A were: E. caviae (74%, Balantidium sp. (68%, Cyathodinium sp. (68% and Cryptosporidium sp. (5%. In facility B: E. caviae (58%, Balantidium sp. (42%, Cyathodinium sp. (25% and G. muris (8% were found. The high prevalences in both facilities suggest that the efficacy of the sanitary barriers adopted in the prevention of parasitic infections should be revised.

  14. Infección inducida en el roedor selvático Dasyprocta leporina (Rodentia: Dasyproctidae, con huevos larvados de Lagochilascaris minor (Nematoda: Ascarididae Induced infection in the wild rodent Dasyprocta leporina (Rodentia: Dasyproctidae with larval eggs of Lagochilascaris minor (Nematoda: Ascarididae

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    S. Gregorio

    1990-12-01

    Full Text Available Ejemplares de Dasyprocta leporina Linnaeus, 1758 fueron criados alejados de su ambiente natural. A los 3 ó 4 meses de edad, se los inoculó por vía oral con huevos de Lagochilascaris minor Leiper, 1909 obtenidos de una paciente nativa. Los huevos se los incubó por más de 80 dias, para que de ellos fuese posible obtener por compresión mecánica, larvas que se mantuviesen vivas en medio acuoso por 48 horas o más. Sacrificados los animales a los 14 ó 46 dias posteriores a la infección, se hallaron en los músculos esqueléticos larvas ovilladas dentro de nódulos inflamatorios, los cuales no presentaban reacción a cuerpo extraño, abscedación o calcificación. El desarollo de los nódulos no parecía afectar la normalidad de los hospedadores. Las larvas obtenidas eran similares a las descritas por SPRENT como de tercer estadio para estos helmintos. Ratones blancos infectados con material similar, no presentaron nódulos en sus músculos ni se pudo recuperar de sus tejidos larva alguna. Por los hallazgos obtenidos con la infección de estos animales, se postula que el helminto no posee ciclo pulmonar y que su desarrollo requiere de un hospedador intermediario.Specimens of Dasyprocta leporina (Linnaeus, 1758 were raised out their natural environment. At three to four months of age they were orally inoculated with Lagochilascaris minor (Leiper, 1909 eggs obtained from a native patient. The eggs were incubated for more than 80 days so that it was possible to obtain, by mechanical compression, larvae that could be maintained alive in liquid medium for 48 hours or more. The animals were sacrificed 14-46 days after infection and tangled larva in inflammatory nodules were found in skeletal muscle without foreign body reaction, abscess formation or calcification. The development of the nodules did not seem to affect the hosts. The larvae obtained were similar to those described by SPRENT as the third stage of these helminths. When white mice were inoculated with similar material it was not possible to recuperate larva from their tissues nor were nodules found. Based on these results it is postulated that the helminth does not present a pulmonary cycle and that its development requires an intermediary host.

  15. Ectoparásitos Asociados a Machos y Hembras de Oxymycterus rufus (Rodentia: Muridae: Estudio comparativo en la Selva Marginal del río de La Plata, Argentina Ectoparasites Associated with Males and Females of Oxymycterus rufus (Rodentia: Muridae: Comparative Study in La Plata River Marshland, Argentina

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    Marcela Lareschi

    2004-12-01

    Full Text Available El objetivo del presente estudio es comparar parámetros e índices de infestación de los ectoparásitos asociados a cada sexo de Oxymycterus rufus (Fischer. El índice de densidad relativa de los machos fue 4,4% y el de las hembras 5,0%. Se recolectaron 873 ectoparásitos de 38 machos y 1015 de 43 hembras. La riqueza y la diversidad específica de los ectoparásitos fueron 12,0 y 1,2 en los machos, 11,0 y 0,7 en las hembras. La similitud entre machos y hembras de acuerdo a sus ectoparásitos fue del 87%. Los resultados obtenidos muestran que el sexo del huésped influenciaría la prevalencia y abundancia media de aquellas especies ectoparásitas que en estudios previos mostraron preferencia por O. rufus, tales como Androlaelaps fahrenholzi (Berlese (abundancia media = 3,5 y prevalencia = 65,8% en los machos; abundancia media = 1,6 y prevalencia = 50,0% en las hembras, Eutrombicula alfreddugesi (Oudemans (abundancia media = 10,9 y prevalencia = 29,0% en los machos; abundancia media = 18,7 y prevalencia = 32,6% en los machos y Ornithonyssus bacoti (Hirst (abundancia media = 7,8 y prevalencia = 63,0% en los machos; abundancia media = 2,7 y prevalencia = 52,6% en las hembras. Esta información es importante desde un punto de vista epidemiológico.Infestation parameters and indexes of ectoparasites associated with each sex of Oxymycterus rufus (Fischer are compared. Males relative density index = 4.4%, females RDI = 5.0%. A total of 873 ectoparasites were collected on 38 males, and 1015 on 43 females; specific richness = 12.0, specific diversity = 1.2 on males, and S = 11.0 H = 0.7 on females. The similarity between both sexes according to their ectoparasites was of 87.0%. The results obtained show that host sex may influence on the prevalence and mean abundance of those ectoparasites which in previous studies have showed preference for O. rufus, such as Androlaelaps fahrenholzi (Berlese (mean abundance = 3.5 and prevalence = 65.8% in males; mean abundance = 1.6 and prevalence = 50.0% in females, Eutrombicula alfreddugesi (Oudemans (mean abundance = 10.9 and prevalence = 29.0% in males; mean abundance = 18.7 and prevalence = 32.6% in females and Ornithonyssus bacoti (Hirst (mean abundance = 7.8 and prevalence = 63.0% in males; mean abundance = 2.7 and prevalence = 52.6% in females. This information is important since an epidemiological viewpoint.

  16. Intraspecific differences in metabolic rate of Chroeomys olivaceus (Rodentia: Muridae: the effect of thermal acclimation in arid and mesic habitats Diferencias intraespecíficas en la tasa metabólica de Chroeomys olivaceus (Rodentia: Muridae: efecto de la aclimatación térmica en hábitat áridos y mésicos

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    F. Fernando Novoa

    2005-06-01

    Full Text Available Studies of metabolic capacities in rodents have been largely studied at an inter-specific levels, but physiological capacities of populations belonging to the same species have received lesser attention. Here we studied the maximum and basal metabolic rates of two populations of the rodent Chroeomys olivaceus dwelling in habitats with contrasting temperature and rainfall regimes, and to test if differences in metabolic capacities are due to local adaptation or acclimatization effect. After four weeks of acclimation to 25 ºC and 10 ºC, the BMR and MMR were determined in individuals from the northern population of Caleta Loa, and the southern population of La Picada. Individuals from ‘La Picada’ population were heavier than those from Caleta Loa. MMR and BMR exhibited higher values in cold acclimated animals compared with warm-acclimated animals. Besides, BMR, but not MMR, was lower in Caleta Loa individuals, in spite of the acclimation treatment. Hence, the differences in the metabolic capacities and the response to acclimation of C. olivaceus populations appear to be an evolutionary response to the environmental cuesLas capacidades metabólicas en roedores han sido ampliamente estudiadas en un nivel ínterespecífico, pero los atributos fisiológicos de las poblaciones que pertenecen a una misma especie, han recibido menos atención. Aquí estudiamos las tasas metabólicas máximas y basales de dos poblaciones del roedor Chroeomys olivaceus que viven en habitats con temperaturas y regímenes de precipitaciones contrastantes y se analiza si las diferencias en las capacidades metabólicas se deben a diferenciación local o a efectos de aclimatación. Después de cuatro semanas de aclimatación a 25 ºC y 10 ºC, el BMR y MMR fueron determinados en individuos de la población norteña de Caleta Loa y en la población sureña de "La Picada". Los individuos de la población "La Picada" presentaron mayor masa corporal que los de Caleta Loa. Los valores de MMR y BMR fueron más altos en animales aclimatados al frío, comparados con los aclimatados a temperaturas más cálidas. Asimismo, sólo BMR y no MMR, fue más bajo en los individuos de Caleta Loa, a pesar del tratamiento de aclimatación. Por lo tanto, las diferencias en las capacidades metabólicas y en la respuesta a la aclimatación de las poblaciones de C. olivaceus, parecen ser una respuesta evolutiva a las claves ambientales

  17. Identificación de los mecanismos subyacentes a la invasión de Castor canadensis (Rodentia en el archipiélago de Tierra del Fuego, Chile Identifying the mechanisms underlying the invasion of Castor canadensis (Rodentia into Tierra del Fuego archipelago, Chile

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    PETRA K WALLEM

    2007-09-01

    Full Text Available Castor canadensis es considerado un ingeniero ecosistémico arquetípico, ya que altera el estado de factores bióticos y abióticos, mediante interacciones no tróficas, modificando sustancialmente los ecosistemas que habita. Esta especie fue introducida en la Isla Grande de Tierra del Fuego en 1946 por el gobierno argentino, con el fin de estimular la industria peletera. Actualmente se encuentra presente en las principales islas del archipiélago, incluyendo Tierra del Fuego, Navarino, Dawson y Hoste y ocupando habitat tan contrastantes como los bosques subpolares magallánicos, el matorral y la estepa patagónica. Su éxito en estos habitat sugiere que su expansión solo se verá limitada por la disponibilidad de recursos hídricos. De acuerdo a lo observado en Tierra del Fuego, en ausencia de un programa de control poblacional, los castores amenazan con establecerse en todos los bosques templados nativos del continente (entre los 35 y 55° S y ocupar los habitat de matorral y pastizal circundantes a los mismos. El presente artículo propone tres hipótesis referentes a los mecanismos subyacentes al éxito de esta invasión: el escape de enemigos naturales, la oportunidad de recursos, y la autofacilitación mediante interacciones no tróficas. Los antecedentes disponibles develan patrones conductuales (e.g., el establecimiento de colonias en forma independiente de la cercanía de recursos maderables, un aparente crecimiento poblacional irruptivo, así como una explotación centrada en Nothofagus pumilio, especie dominante en los bosques magallánicos que sugieren la operación de los mecanismos de escape de enemigos naturales y oportunidad de recursos. También se observa una mayor densidad de colonias activas en habitat que presentan mayor extensión de modificación ambiental, sugiriendo el accionar del mecanismo de autofacilitación. Si bien la información reunida no permite poner a prueba las hipótesis propuestas, sí entrega un marco conceptual sobre el cual se pueden desarrollar futuras investigaciones referentes a esta invasiónCastor canadensis is considered an archetypical ecosystem engineer, which modifies the state of biotic and abiotic factors through non-trophic interactions. This species was introduced by the Argentinean government into Tierra del Fuego island in 1946, and subsequently colonized autonomously the neighboring islands of Navarino, Dawson and Hoste. Currently this invader occupies contrasting ecosystems such as the Magellan subpolar beech forest and Patagonian scrub and steppe. This ability to colonize contrasting habitats suggests that beaver expansion will be limited mainly by hydrological resources, threatening to colonize the complete extent of temperate beech forests on the mainland (from 35 to 55° S. The present review proposes three hypotheses regarding the underlying mechanisms to this successful invasion: natural enemy escape, resource opportunities, and self-facilitation through non-trophic interactions. Current knowledge regarding beaver colonization and foraging behavior (e.g., habitat selection independently of forest availability, irruptive population growth, and apparent selective exploitation of Nothofagus pumilio, dominant species in the Magellan forest suggests that enemy escape and resource opportunity are the main mechanisms underlying this invasion. The observation of higher densities of active colonies, where the extent of beaver habitat modification is larger, suggests that self-facilitation may be relevant to the success of this invasion. Current information does not allow testing these hypotheses, but it provides a framework to develop future investigations regarding this invasion in Tierra del Fuego

  18. Les Cricetidae (Mammalia, Rodentia) du Néogène Moyen de Vieux-Collonges. Partie 2 : Cricetodontinae incertae sedis, Melissiodontinae, Platacanthomyinae, et Anomalomyinae = Cricetidae (Mammalia, Rodentia) of the middle Neogene of Vieux Collonges. France. Part 2 : Cricetodontinae incertae sedis, Melissiodontinae, Platacanthomyinae, et Anomalomyinae

    NARCIS (Netherlands)

    Mein, P.; Freudenthal, M.

    1981-01-01

    Apart from the common cricetid fauna, the site of Vieux-Collonges contains a number of rare forms: Lartetomys, Melissiodon, Neocometes, and Anomalomys. This scarce material is described and compared with material from other European localities. The stratigraphie position of Vieux-Collonges is discus

  19. Compte rendu de l’ouvrage de José Luis Gutiérrez Molina, Casas Viejas. Del crimen a la Esperanza. María Silva « Libertaria » y Miguel Pérez Cordón: dos vidas unidas por un ideal (1933-1939 Reseña del libro de José Luis Gutiérrez Molina, Casas Viejas. Del crimen a la Esperanza. María Silva « Libertaria » y Miguel Pérez Cordón: dos vidas unidas por un ideal (1933-1939

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    Gérard Brey

    2009-08-01

    Full Text Available Desde hace más o menos una década, determinados sectores de la opinión p��blica española se preocupan por «recuperar la memoria histórica» de la guerra civil española o, mejor dicho, la de las víctimas olvidadas del bando «vencido», mientras que los herederos del otro bando evocan de vez en cuando las víctimas del «comunismo». Se han ido constituyendo asociaciones en distintos puntos del país para localizar los restos de las víctimas de la represión franquista en los meses de la guerra, para d...

  20. Plaadid / Margus Kiis

    Index Scriptorium Estoniae

    Kiis, Margus

    2004-01-01

    Uutest plaatidest Courtney Love "American Sweetheart", Haltya "Electric Help Elves", Beats and Styles "This Is... Beats and Styles", "Ennio Morricone Remixes vol. 2", Delta Goodrem "Innocent Eyes", Juana Molina "Segundo"

  1. Lisa maailmakirjanduse tõlkevaramule

    Index Scriptorium Estoniae

    2006-01-01

    Uued teosed sarjast "Maailmakirjanduse tõlkevaramu": Tirso de Molina "Sevilla pilkaja ja kivist külaline" ja Pedro Calderon de la Barca "Suur Maailmateater" (Tartu : Tartu Ülikooli Kirjastus, 2006)

  2. 75 FR 61573 - Unblocking of Specially Designated Nationals and Blocked Persons Pursuant to Executive Order 12978

    Science.gov (United States)

    2010-10-05

    ... blocked pursuant to the Order: 1. ALZATE SALAZAR, Luis Alfredo, c/o COINTERCOS S.A., Bogota, Colombia; c/o... 16689631 (Colombia) (individual) 3. BAEZA MOLINA, Carlos Alberto, c/o DERECHO INTEGRAL Y CIA. LTDA.,...

  3. Fauna helmintológica peruana: Paryphostomum huaccaci sp. n. (Echinostomotidoe parásito de Cathartes aura jota Molino, 1782

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    Nicanor Ibáñez H.

    2014-06-01

    Full Text Available Es motivo de la presente nota, contribuir al conocimiento de un trematodo: Paryphostomum huaccaci sp. n. perteneciente o la Familia Echinostomatidae Poche, 1926 y que parásita a Cathartes aura jota Molina, 1782.

  4. The gastrointestinal helminths of Rattus niobe (Rodentia: Muridae) with descriptions of two new genera and three new species (Nematoda) from Papua New Guinea and Papua Indonesia.

    Science.gov (United States)

    Smales, L R

    2016-05-31

    Cestodes, to be identified elsewhere, the acanthocephalan Moniliformis moniliformis and 15 species of nematode including 2 new genera, a new species and 2 putative new species from the families Heligmonellidae and Oxyuridae, as well as juveniles and a putative heligmonellid that could not be fully identified, were collected from the digestive tracts of 34 Rattus niobe (Muridae: Murinae: Rattini) from Papua, Indonesia and Papua New Guinea. The ascaridid, Toxocara mackerrasae, the chabertiid Cyclodontostomum purvisi, the heterakid Heterakis sp., the spirurids Protospirura kaindiensis and P. muricola the subulurid Subulura andersoni and the trichurids Eucoleus sp. and Trichuris muris have been reported previously from endemic Rattus spp. Syphacia (Syphacia) niobe n. sp. was distinguished from its congeners by a combination of characters including a round cephalic plate, the lack of cervical and lateral alae, a longer male tail and an attenuated female tail. Nugininema titokis n. gen., n. sp. differs from all other genera in the Heligmonellidae in the characters of the synlophe, 10-17 ridges orientated subfrontally at mid body and 2 right ventral ridges hypertrophied anteriorly. Rodentanema aenigma n. gen., n. sp. differs from all other genera in the Heligmonellidae in the characters of the synlophe 6-7 ridges at mid body not symmetrical in relation to frontal axis. Species richness of the nematode assemblage was similar to that reported for Rattus leucopus in Papua New Guinea, with about 90% of possible species found as indicated by bootstrap analysis. Species composition included 6 species unique to R. niobe and 7 species reported from at least one other species of Rattus indigenous to New Guinea, as well as juvenile worms, probably ascaridids.

  5. [Morphology and biometry of eggs and larvae of Strongyloides sp. Grassi, 1879 (Rhabditoidea: Strongyloididae), a gastrointestinal parasite of Hydrochaeris hydrochaeris (Linnaeus, 1766) (Rodentia: Hydrochaeridae), in the municipality of Juiz de Fora, Minas Gerais, Brazil].

    Science.gov (United States)

    Vieira, Fabiano M; Lima, Sueli de S; Bessa, Elisabeth Cristina de A

    2006-01-01

    An important method to diagnose and study the helminthofauna of wild animals is to examine the host's feces to find eggs and larvae, seeking to identify the parasites and study their morphobiology. The objective of the present work is to provide morphological and biometric data on the eggs and larvae of Strongyloides sp., a capybara gastrointestinal parasite. Using the technique of Gordon and Whitlock, simple flotation and the modified Baermann examination, capybara fecal samples were selected based on a criterion of the highest proportion of eggs and larvae in the initial development stages, for morphometric description of eggs, L1, L2 and L3 of Strongyloides sp. From past reports of parasitism in Hydrochaeris hydrochaeris, we suspect that the eggs and larvae in this study are of Strongyloides chapini Sandground, 1925, which constitutes the first description of these stages for this species of nematode. Nevertheless, the morphology and biometry data of these stages demonstrate that they are similar to those of other species of the Strongyloides genus.

  6. About rats and jackfruit trees: modeling the carrying capacity of a Brazilian Atlantic Forest spiny-rat Trinomys dimidiatus (Günther, 1877) – Rodentia, Echimyidae – population with varying jackfruit tree (Artocarpus heterophyllus L.) abundances

    OpenAIRE

    Mello,JHF; Moulton,TP; Raíces,DSL; Bergallo,HG.

    2015-01-01

    We carried out a six-year study aimed at evaluating if and how a Brazilian Atlantic Forest small mammal community responded to the presence of the invasive exotic species Artocarpus heterophyllus, the jackfruit tree. In the surroundings of Vila Dois Rios, Ilha Grande, RJ, 18 grids were established, 10 where the jackfruit tree was present and eight were it was absent. Previous results indicated that the composition and abundance of this small mammal community were altered by the presence and d...

  7. About rats and jackfruit trees: modeling the carrying capacity of a Brazilian Atlantic Forest spiny-rat Trinomys dimidiatus (Günther, 1877) - Rodentia, Echimyidae - population with varying jackfruit tree (Artocarpus heterophyllus L.) abundances.

    Science.gov (United States)

    Mello, J H F; Moulton, T P; Raíces, D S L; Bergallo, H G

    2015-01-01

    We carried out a six-year study aimed at evaluating if and how a Brazilian Atlantic Forest small mammal community responded to the presence of the invasive exotic species Artocarpus heterophyllus, the jackfruit tree. In the surroundings of Vila Dois Rios, Ilha Grande, RJ, 18 grids were established, 10 where the jackfruit tree was present and eight were it was absent. Previous results indicated that the composition and abundance of this small mammal community were altered by the presence and density of A. heterophyllus. One observed effect was the increased population size of the spiny-rat Trinomys dimidiatus within the grids where the jackfruit trees were present. Therefore we decided to create a mathematical model for this species, based on the Verhulst-Pearl logistic equation. Our objectives were i) to calculate the carrying capacity K based on real data of the involved species and the environment; ii) propose and evaluate a mathematical model to estimate the population size of T. dimidiatus based on the monthly seed production of jackfruit tree, Artocarpus heterophyllus and iii) determinate the minimum jackfruit tree seed production to maintain at least two T. dimidiatus individuals in one study grid. Our results indicated that the predicted values by the model for the carrying capacity K were significantly correlated with real data. The best fit was found considering 20~35% energy transfer efficiency between trophic levels. Within the scope of assumed premises, our model showed itself to be an adequate simulator for Trinomys dimidiatus populations where the invasive jackfruit tree is present.

  8. [Leishmania major Yakimoff et Schokhor, 1914 (Kinetoplastida: Trypanosomatidae) in Meriones shawi Duvernoy, 1842 (Rodentia: Gerbillidae): persistence of the infection in meriones and its infectivity for the sand fly vector (Phlebotomus) papatasi Scopoli, 1786 (Diptera: Psychodidae).

    OpenAIRE

    Derbali, M.; Chelbi, I.; Ben Hadj Ahmed, S.; Zhioua, E.

    2012-01-01

    International audience; The ability of the sand fly Phlebotomus papatasi to transmit Leishmania major, the etiologic agent of zoonotic cutaneous leishmaniasis, to Meriones shawi, the natural reservoir host of this parasite, was studied under laboratory conditions. Sand flies became infected with L. major after feeding on a lesion of needle-inoculated M. shawi. Moreover, P. papatasi, previously infected with L. major, transmitted the parasite to M. shawi by bite during a second bloodmeal. Two ...

  9. Presencia de Hydrochoerus hydrochaeris (Hydrochoeridae, Rodentia, Mammalia en la cuenca del río Carcarañá, Santa Fe, Argentina: Comentarios acerca de su conservación y biogeografía en Argentina

    Directory of Open Access Journals (Sweden)

    Pablo G. Rimoldi

    2014-01-01

    Full Text Available El carpincho (Hydrochoerus hydrochaeris es el roedor actual más grande del mundo y uno de los mamíferos típico de las Provincias Fitogeográficas Pampeana y del Espinal, habitando todo el sector Este de las mismas. Estas regiones han sido categorizadas por la World Wildlife Foundation (WWF como áreas "en peligro crítico/ amenazada", y se les asigna el nivel de máxima prioridad de conservación como consecuencia de la destrucción de hábitat, la sobreexplotación, la contaminación y la introducción de especies exóticas. El carpincho presenta una preferencia marcada por los ambientes con abundancia de cuerpos de agua donde la vegetación palustre le proporciona alimento y refugio. De esta forma, tanto los cuerpos de agua como la vegetación asociada es determinante para la prevalescencia de poblaciones de carpinchos en un ambiente determinado. Para la provincia de Santa Fe los registros no son muy abundantes, registrándose hasta la actualidad unos 33 puntos de colecta/observación, la gran mayoría ubicados en el centro y norte de la provincia. El objetivo de la presente contribución es presentar nuevos registros de presencia de Hydrochoerus hydrochaeris en la cuenca del río Carcarañá (sur de la provincia de Santa Fe, y su asociación con algunas variables climático-ambientales y evaluar la distribución de esta especie. Finalmente, se discute la posible expansión o migración de este especie hacia el oeste de esta provincia y de la provincia de Buenos Aires.

  10. Endogenous development, pathogenicity and host specificity of Eimeria cahirinensis Couch, Blaustein, Duszynski, Shenbrot and Nevo, 1997 (Apicomplexa: Eimeriidae) from Acomys dimidiatus (Cretzschmar 1826) (Rodentia: Muridae) from the Near East.

    Science.gov (United States)

    Kvicerová, Jana; Ptácková, Pavla; Modrý, David

    2007-01-01

    Eimeria cahirinensis Couch et al. 1997 was found in faecal samples of Acomys dimidiatus from three different localities in the Near East. Twenty-two of 104 (21%) A. dimidiatus trapped on both the south- and north-facing slopes of "Evolution Canyon", Lower Nahal Oren, Mt. Carmel, Israel in August 2001 and 2002 were infected with E. cahirinensis. Oocysts were also obtained from a single individual of A. dimidiatus trapped in Wadi Ramm, Jordan in the summer of 1999. Laboratory-reared spiny mice (Acomys spp.) were inoculated to determine the prepatent and patent period, sporulation time, site of infection, immunogenicity, pathogenicity, pathology and morphology of endogenous stages of E. cahirinensis. Both asexual and sexual stages were localised in the apical part of duodenal and jejunal villi. An experimental inoculation of representatives of several rodent genera revealed the host range of E. cahirinensis to be limited to the genus Acomys.

  11. 云南洱海周边地带社鼠体表寄生虫的群落组成%Ectoparasite Communities of Niviventer confucianus ( Rodentia:Muridae) in the Surrounding Areas of Erhai Lake in Yunnan

    Institute of Scientific and Technical Information of China (English)

    董文鸽; 郭宪国; 门兴元; 钱体军; 吴滇

    2009-01-01

    Objective Niviventer confucianus (Milne-Eawards 1871) is the oriental species, not only have been believed to be an important pest for agriculture and forest hut also have been suspected the reservoir of plague, scrub typhus and epidemic hemorrhagic fever (EHF) in the wild rodent-type plague focus of northwestern Yunnan province. This study is aimed to understand the diversity of ectoparasites in a population of Niviventer confucianus in the Surrounding areas of Erhai Lake. Ectoparasite communities of 89 Niviventer confucianus were studied. Methods Different oriented areas surrounding the Erhai Lake in Yunnan were selected as investigation spots. Small mammals were randomly captured with baited mouse cages and ectoparasites were collected form the animals. Ectoparasites were identified to species under a microscope. The constituent ratio(C), prevalence (P) and average ectopaxasite abundance (A) were used to determine the prevalence and density of ectoparasites. Non-parametric Mann-Whitney U-tests were used to test differences in the abundance and richness of ectoparasites between female and male hosts. Spearman correlation analysis was used to analyze the relationship between ectoparasites and the body parameters of hosts. Results There is very high diversity of ectoparasites of Niviventer confucianus and some species of ectoparasites have been reported associated with human disease. A high proportion (79%) of 70 Niviventer confucianus was found to be infested with ectoparasites. A total of 51 species of ectoparasites, including 31 species of chigger mite, 13 species of mesostigmatid (gamasid) mite, 4 species of flea and 3 species of sucking louse were collected. Walchia ewingi fuller is the most abundant chigger mite species, accounting for 66.23% of all chigger mites. Laelaps turkestanicus lange is the most abundance gamasid mite species, accounting for 38.48% of all gamasid mites. Paradoxopsyllus custodies Jordan was the most abundance of the fleas observed, accounting for 42.86% of all fleas collected. Hoplopleurapacifica was the most abundance of the sucking lice observed, accounting for 80.07% of all sucking lice collected. Within this ectoparasite complex, 11 species have previously been reported to be vectors of human diseases. Non-parametric Mann-Whitney U-tests showed the species richness and abundance of total ectoparasites, chigger mites, sucking lice, fleas or gamasid mites had no significant differences between male and female hosts. Spearman correlation analysis showed that abundance and species of total ectoparasite, chigger mite, sucking louse, flea or gamasid mite were not correlated with the body weight of the host. Conclusions The community structure of ectoparasites of Niviventer confucianus is complex, which reflects a high species diversity of ectoparasites on Niviventer confucianus. 11 species have previously been reported to be vectors of human diseases. Sucking lice, fleas, chiggers and gamasid mites are main ectoparasites. Niviventer confucianus would be a natural reservoir for pathogen on plague bacilli, epidemic haemorrhagic fever (korean haemorrhagic fever) viruses, and scrub typhus.%目的 社鼠是东洋界种,不仅一直被认为是农林业有害动物.而且被怀疑为滇西北鼠疫疫源地的鼠疫、恙虫病和流行性出血热(汉坦病毒)等病原体的储存宿主.为了了解洱海周边地带社鼠体表寄生虫的多样性,我们研究了89只社鼠体表寄生虫的群落组成.方法 选取云南洱海周边的不同地理方位作为野外抽样调查地点,用鼠笼加食饵诱捕小兽并检获其体表寄生虫.体表寄生虫在显微镜下鉴定寄生虫的种类.用染虫率和虫指数反映体表寄生虫的流行和密度状况,用统计分析中的非参数检验(Non.parametric Mann.Whitney U)分析雌雄小兽宿主间寄生虫数量差异.用Spearman相关分析(Spearman correlation analysis)体表寄生虫数量与宿主身体参数的关系.结果 捕获89只社鼠.其中70只社鼠侵染体表寄生虫,总侵染率为79%.采集到体表寄生虫51种,包括31种恙螨、13种革螨、4种蚤及3种吸虱.攸氏无前恙螨为优势恙螨种,占恙螨总数的66.23%;土尔克厉螨为优势革螨种,占革螨总数的38.48%;绒鼠怪蚤为优势蚤种,占蚤总数的42.86%;太平洋甲胁虱为优势吸虱种,占吸虱总数的80.07%.这51种体表寄生虫中,有11种被证明是人类疾病的主要媒介.U检验表明,体表寄生虫、恙螨、吸虱、蚤类和革螨的个体数量和物种数在雌雄宿主体表间的差异无统计学意义.spearman相关分析表明,体表寄生虫、恙螨、吸虱、蚤类和革螨的个体数量与宿主身体参数(体重)之间无相关性.结论 社鼠的体表寄生虫群落结构复杂,物种多样性高,其中有11种曾经报道与人类疾病有关.社鼠主要的体表寄生虫为吸虱、蚤类、革螨和恙螨,社鼠很可能成为鼠疫、流行性出血热和灌丛斑疹伤寒等病原体的贮存宿主.

  12. INVESTIGATION ON RELATIVE DENSITY OF RODENTIA AND INSECTIVORA IN MT EMEI IN AUTUMN%峨眉山啮齿类和食虫类秋季相对密度调查

    Institute of Scientific and Technical Information of China (English)

    康明江; 苗苗; 王晓琴; 胡锦矗

    2003-01-01

    2002年9月28日~10月6日,主要用铗日法对四川峨眉山啮齿类和食虫类进行调查,得出以下结论:被捕的20种中,相对密度较大的为高山姬鼠(Apodemus chevrieri)占26.09%、龙姬鼠(Apodemus draco)占18.26%、长尾姬鼠(Apodemus sylvaticus)占15.65%及四川短尾鼩(Anourosorex squamipes)占10.43%;在5个典型生境样点中,金顶(15.33%)、雷洞坪(20.99%)和仙峰寺(13.95%)3处的兽类相对密度较大,但清音阁(1.01%)和报国寺(0)二处的相对密度很小,导致其显著差异的具体原因尚不清楚,有待进一步研究.

  13. DIPODIDAE (RODENTIA, MAMMALIA) FROM THE MID-TERTIARY DEPOSITS IN DANGHE AREA, GANSU, CHINA%甘肃党河地区第三纪中期的跳鼠化石

    Institute of Scientific and Technical Information of China (English)

    王伴月

    2003-01-01

    描述了产自甘肃省党河地区第三纪中期的跳鼠化石3属7种.其中5种(Parasminthusasiae-centralis,P.tangingoli,P.parvulus,Heterosminthus lanzhouensis和Litodonomys cf L.huang-heensis)产自狍牛泉组上部,时代为晚渐新世.产自早中新世(?)铁匠沟组中部的2种是中间异蹶鼠(新种)(Heterosminthus intermedius sp.nov.)和西水简齿鼠(新种)(Litodonomys xishuiensissp.nov.).Heterosminthus intermedius的主要特征是:M2的前齿带较短而低,ml的下次脊较向前斜伸,与下中尖前的下外脊相连;在颊齿的宽窄比例和其他一些特征上介于H.orientalis和H.lanzhouensis之间.Litodonomys xishuiensis的主要特征为:下臼齿比例上较宽短,下外脊位于纵中线附近;下中脊在m1中长,在m2中无;m2和m3下前边尖很发育,但孤立;m3下中凹和下外凹明显缩短等.探讨了Heterosminthus和Litodonomys的进化趋势和铁匠沟组中部的时代.

  14. Evolución de los géneros Mimomys, Arvicola y Allophaiomys (Arvicolidae, Rodentia, Mammalia en el Plioceno y Pleistoceno de la Península Ibérica

    Directory of Open Access Journals (Sweden)

    Ruiz Bustos, A.

    1985-04-01

    Full Text Available A new interpretation of the philogeny of the arvicolids Mimomys, Arvicola and Allophaiomys is proposed in this paper as a result of the comparison between several faunas of the Pliocene and lower and middle Pleistocene of the Iberian Península.
    The morphologic study of the abundant populations of Mimomys of the Pliocene bed from Moreda, has made it possible to establish, for each species, four divisions according to the stages of wear of the first lower molar. The evolution of Mimomys is closely related to the qualitative and quantitative variations of those stages of wear (from the most primitive to the most progressive ones in the course of the time and for each different populations of Mimomys, which leads us to propose the following scheme of the evolution of the genus: During the Pliocene, two evolutionary lines of Mimomys are present since the appearance of the genus in the Iberian Peninsula: one of small size, in which the acquisition of cement in the molars is progressive, That one is represented by the following evolutionary stages: M. stehlini in the Ruscinian and M. pliocaenicus-M, medasensis in the upper Pliocene. the other line, of big size, is represented by M. cappettai and the cement in the molars exists already in the niore primitive populations. At the end of the Pliocene appears M. reidi of small size, By its similar morphology, the latter species is very probably the ancestor of the bigger M. savini that belongs to the lower and middle Pleistocene. On the other hand, the morphologic identity and the biometric proximity of Allophaiomys chalinei to the populationsof small size of Arvicola (A. mosbachensis, leads us to propose the evolutionary line: Arvicola deucalion-Arvicola chalinei-Arvicola mosbachensis. Therefore, Mimomys is an independent and coetaneus genus of Arvicola that disappeared in the upper Pleistocene. Finally, Allophaiomys pliocaenicus gives rise to Microtus and Pitymys by a cladogenetic process of diversification.

    En el presente trabajo se propone una nueva interpretación de la filogenia de los arvicólidos Mimomys, Arvicola y Allophaiomys como resultado de la comparación de diversas faunas del Plioceno y Pleistoceno inferior y medio de la Península Ibérica.
    El estudio morfológico de las abundantes poblaciones de Mimomys del yacimiento Plioceno de Moreda, ha permitido, para cada especie, su división en cuatro estadios de desgaste! del primer molar inferior. La evolución de Mimomys está estrechamente relacionada con la variación cualitativa y cuantitativa de dichos estadios de desgaste (de los más primitivos a los más progresivos a lo largo del tiempo en el seno de las diferentes poblaciones de Mimomys , lo cual nos lleva a proponer el siguiente esquema. de la evolución del género: Durante el Plioceno, dos líneas evolutivas de Mimomys están presentes desde la aparición del género en la Península Ibérica: una de pequeña talla en la que la adquisición de cemento en los molares es progresiva y que está representada por los estadios evolutivos: M. stehlini en el Rusciniense y M. pliocaenicus - M. medasensis en el Plioceno superior. Y otra línea de gran talla representada por M. cappettai en la que el cemento en, los molares existe ya en las poblaciones más primitivas. Al final del Plioceno aparece M. reidi, de pequeña talla, que, por su semejanza morfológica, es muy probablemente el antecesor de M. savini, de mayor talla, del Pleistoceno inferior y medio.
    Por otra parte, la identidad morfológica y la proximidad biométrica de Allophaiomys deucalion y Allophalomys chalinei con las poblaciones de pequeña talla de Arvicola del Pleistoceno medio (Arvicola mosbachensis, nos llevan a proponer la línea evolutiva: Arvicola deucalion-Arvicola chatinei-Arvicola mosbachensis. Así pues, Mimomys es un género independiente y coetáneo de Arvicola que se extingue durante el Pleistoceno superior.
    Finalmente, Allophalomys pliocaenicus dará lugar por un proceso cladogenético de diversificación a Microtus y Pitymys.

  15. Description of Litomosoides ysoguazu n. sp. (Nematoda, Onchocercidae), a parasite of the tuft-toed rice rat Sooretamys angouya (Fischer) (Rodentia: Cricetidae), and a first record of L. esslingeri Bain, Petit & Berteaux, 1989 in Paraguay.

    Science.gov (United States)

    Notarnicola, Juliana; de la Sancha, Noé Ulises

    2015-06-01

    Paraguay is a small landlocked country whose mammalian fauna is among the least studied in South America, as well as their parasites. As a result of a study of the effects of habitat fragmentation on small mammal biodiversity in eastern Paraguay, we have collected some parasites of cricetid rodents. Herein, we describe a new species of Litomosoides Chandler, 1931 parasitising the body cavity of the tuft-toed rice rat Sooretamys angouya (Fischer) and Litomosoides esslingeri Bain, Petit & Diagne, 1989 parasitising Oligoryzomys nigripes (Olfers), thus expanding its geographical distribution into Paraguay. Litomosoides ysoguazu n. sp. is characterised by the large size of the females (92.2-117.6 mm long) and by having buccal capsule with an anterior widening with rounded edges on the chitinous segment and a rounded widening at the base; male tail with a single pair of adcloacal papillae, three to five pairs of asymmetrical postcloacal papillae, and one or two unpaired papillae in the median ventral line; spicules corresponding to the "sigmodontis" species group; and microfilaria with a sheath stuck to the body and visible in the anterior extremity. We also describe a fourth-stage female larva. Oligoryzomys nigripes is a new host record of L. esslingeri; this enlarges the host record to eight species highlighting the low specificity of this species.

  16. First genotoxicity study of Paraná river water from Argentina using cells from the clam Corbicula fluminea (Veneroida Corbiculidae and Chinese hamster (Cricetulus griseus Rodentia, Cricetidae K1 cells in the comet assay

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    Jacqueline D. Caffetti

    2008-01-01

    Full Text Available High concentrations of xenobiotics from urban and industrial wastes have contributed to the contamination of many aquatic environments. We used the comet assay to evaluate the genotoxic potential of water collected from the River Paraná, which receives a great deal of waste, at three points (Puerto Piray, Eldorado and Montecarlo in the Misiones Province of Argentina. The in vivo comet assay used 40 freshwater clams (Corbicula fluminea while the in vitro comet assay used Chinese hamster (Cricetulus griseus K1 cell (CHO-K1 cultures with the mutagen ethyl methanesulfonate (EMS as the positive control and phosphate buffered saline (PBS as the negative control. Both assays showed statistically significant differences between the three sampling sites in relation to the negative control, the results of this preliminary study indicating that at these three sites water from the Paraná River presents genotoxic potential.

  17. DOĞU KARADENİZ BÖLGESİNDE YAYILIŞ GÖSTEREN APODEMUS KAUP, 1829 (MAMMALIA: RODENTIA) CİNSİNİN MORFOLOJİK ANALİZİ

    OpenAIRE

    2007-01-01

    Bu çalışmada Doğu Karadeniz bölgesinden örneklenen Apodemus cinsine ait 126 örneğin kafatası ve postları değerlendirildi. Diş, kafası ve post örneklerinin yapılan morfolojik analizleri sonucunda bu cinse ait dört tür; Apodemus uralensis, Apodemus flavicollis, Apodemus iconicus ve Apodemus mystacinus belirlendi. Bu türlerden A. flavicollis ve A. iconicus morfolojik açıdan büyük benzerlik gösterirken, A. uralensis’ inde bu iki türe olan yakınlığı yapılan morfolojik ve biyometrik analizler so...

  18. Redescription of Heligmosomoides neopolygyrus, Asakawa and Ohbayashi, 1986 (Nematoda: Heligmosomidae) from a Chinese rodent, Apodemus peninsulae (Rodentia: Muridae); with comments on Heligmosomoides polygyrus polygyrus (Dujardin, 1845) and related species in China and Japan.

    Science.gov (United States)

    Massoni, J; Durette-Desset, M C; Quéré, J P; Audebert, F

    2012-11-01

    Heligmosomoides neopolygyrus, Asakawa and Ohbayashi, 1986 (Nematoda, Heligmosomoidea) is redescribed from Apodemus peninsulae from Rangtang, Sichuan, China. A morphological review of the Heligmosomoides spp. belonging to the "polygyrus line" proposed by Asakawa (1988) is made using new characters. This enabled us to distinguish two subspecies in Mus musculus (Heligmosomoides polygyrus bakeri from Japan and H. p. polygyrus from China) and two valid species in Apodemus spp. (H. neopolygyrus from Japan (in A. peninsulae) and from China (in A. agrarius) and H. asakawae from China (in A. uralensis)). Three parasite species of A. agrarius and A. peninsulae, previously identified by Asakawa et al. (1993) as H. neopolygyrus, are considered to be Heligmosomoides incertae sedis. This is the first report of H. neopolygyrus in A. peninsulae from China.

  19. EOMYIDS (MAMMALIA: RODENTIA) FROM THE LATE MIOCENE LUFENG AND YUANMOU HOMINOID LOCALITIES, YUNNAN%云南禄丰、元谋晚中新世古猿地点始鼠科化石

    Institute of Scientific and Technical Information of China (English)

    邱铸鼎

    2006-01-01

    The material which forms the basis of this study was collected from two hominoid localities,Shihuiba of Lufeng and Leilao of Yuanmou, in Yunnan Province in the last twenty years. Five forms of eomyid rodents, Plesieomys mirabilis gen. et sp. nov. , Heteroeomys yunnanensis gen. et sp. nov. , Leptodontomys pusillus sp. nov., Leptodontomys sp. and Eomyidae gen. et sp. indet, are now recognized in the two late Miocene faunas. Morphologically, Plesieomys n. gen. shows some similarities to Pseudadjidaumo Lindsay, 1972 of North America, but the phylogenetic relationship of the new genus to the American genus is uncertain. Heteroeomys exhibits a mixture of primitive and advanced dental features of bunodont eomyids and might be descended from an early Eomys species. Leptodontomys pusillus is characterized by its smaller size, weaker developed lingual anteroloph on M1/2, narrow anterolophid and poor mesolophid and hypolophid on m1/2. The eomyid record in Yunnan indicates that eomyid rodents are a wideranging family in Asia, and that forested habitats are preferred more by eomyids with bunodont cheekteeth than by eomyids with lophodont cheek-teeth.

  20. Experimental evidence and ecological perspectives for the adaptation of Schistosoma mansoni Sambon, 1907 (Digenea: Schistosomatidae to a wild host, the water-rat, Nectomys squamipes Brants, 1827 (Rodentia: Sigmodontinae

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    Paulo Sérgio D'Andrea

    2002-10-01

    Full Text Available Due to the semi aquatic habits and the overlap of the geographical distribution of the water-rat, Nectomys spp., with schistosomiasis endemic areas, these wild rodents are very likely to acquire Schistosoma mansoni infection in their daily activities. The role of the water-rat in the S. mansoni cycle would be substantiated if one could prove that these rodents acquire the parasite during their own activity time, a completely independent time schedule of human activities. To pursue this goal, we performed two field experiments in the municipality of Sumidouro, State of Rio de Janeiro, Brazil, a schistosomiasis endemic area where N. squamipes is found naturally infected. One experiment was devised as a series of observations of activity time of the water-rat. The other experiment was a test of the occurrence of late transmission of S. mansoni to the water-rat. The daily activity pattern showed that the water-rat is active chiefly just after sunset. At both diurnal and late exposition essays the water-rat sentinels got infected by S. mansoni. These findings clarify ecological and behavioral components necessary to the adaptation of S. mansoni to the water-rat as a non human definitive host and the existence of a transmission cycle involving this animals as a reservoir.

  1. MAMÍFEROS PEQUEÑOS EN LA DIETA DE LA LECHUZA TYTO ALBA (STRIGIFORMES: TYTONIDAE EN DOS LOCALIDADES DEL OCCIDENTE DE ECUADOR, CON AMPLIACIÓN DISTRIBUCIONAL DE ICHTHYOMYS HYDROBATES (RODENTIA: CRICETIDAE

    Directory of Open Access Journals (Sweden)

    JORGE BRITO M.

    2015-01-01

    Full Text Available En el presente estudio a partir de 107 egagrópilas de la lechuza, determinamos el consumo de 300 presas agrupadas en 21 especies, las egagrópilas fueron colectadas en dos localidades de diferente ambiente Los Santiagos y La Ciénaga, en las provincias de Chimborazo y Manabí, al occidente de Ecuador. Nuestros análisis revelaron una dieta compuesta mayoritariamente de mamíferos pequeños, sobre todo roedores, quienes constituyeron el 80%. Entre las presas más abundantes se encontró a Oligoryzomys sp. que representó el 38.7% de la dieta en las muestras de Los Santiagos y Sigmodon peruanus 33.6% en La Ciénaga, siendo el 22,5% y 41% respectivamente de la biomasa total consumida para cada sitio. La rata cangrejera Ichthyomys hydrobates es reportada por primera vez en la dieta de la lechuza y también en la localidad de Los Santiagos, ampliando el rango distribucional de este roedor para el centro-sur al occidente de Ecuador en aproximadamente 200 km.

  2. Parasites of mammals on the Sevilleta National Wildlife Refuge, Socorro, New Mexico: Cuterebra austeni and C. neomexicana (Diptera:Oestridae) from Neotoma and Peromyscus (Rodentia:Muridae), 1991-1994.

    Science.gov (United States)

    Wilson, W D; Hnida, J A; Duszynski, D W

    1997-05-01

    In total, 6,486 rodents representing 3 families (Muridae, Heteromyidae, and Sciuridae) and 24 species were trapped May through August of 1991 through 1994. Of these, only the white-throated woodrat. Neotoma albigula Hartley; piñon mouse, Peromyscus truei Shufeldt; and white-footed mouse, P. leucopus Rafinesque, were infested with Cuterebra Clark larvae. Of the 594 N. albigula that were captured 103 (17.3%) were infested with 139 Cuterebra larvae with all infestations occurring in the throat region. N. albigula infestations were observed in 4 of 5 habitats sampled. The highest prevalence of infestation occurred during May-June (27.2%) versus July-August (9.1%) and in males (25.2%) versus females (18.3%). Prevalence of infestation was not significantly different between animals from the mark-release webs versus removal webs or adults versus juveniles. Also, there was no correlation between relative density of N. albigula and prevalence of infestation. Fifteen adults were reared from puparia and identified as C. austeni Sabrosky. Of 716 P. truei captured, 22 (3.1%) were infested with a total of 25 Cuterebra larvae with all infestations occurring in the scapular region. Although P. truei were captured in all 5 habitats, they were only infested in the piñon-juniper habitat: the highest prevalence of infestation occurred during July-August (10.9%) versus May-June (3.3%). Prevalence of infestation was not significantly different between animals from mark-release webs versus removal webs, males versus females, or adults versus juveniles. As in the N. albigula, there was no correlation between relative density of P. truei and prevalence of infestation. The adult reared from a puparium was identified as C. neomexicana Sabrosky. Of the 310 P. leucopus captured, only 3 (1%) were infested with Cuterebra larvae.

  3. First report of Siphonaptera infesting Microtus (Microtus cabrerae (Rodentia-Muridae-Arvicolinae in Cuenca , Spain and notes about the morphologic variability of Ctenophthalmus (Ctenophthalmus apertus personatus (Insecta-Siphonaptera-Ctenophthalmidae

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    Gómez M.S.

    2003-06-01

    Full Text Available The fleas infesting Microtus (Microtus cabrerae from three different areas of Cuenca province (Spain have been studied. It is the first time that an ectoparasitological study of this badly known rodent has been done. Four Siphonaptera species have been detected : Rhadinopsylla (Actenophthalmus pentacantha, Peromyscopsylla spectabilis spectabilis, Nosopsyllus fasciatus and Ctenophthalmus (Ctenophthalmus apertus personatus, which was the most abundant species (26 males and 31 females of a total of 28 males and 35 females. Considering the great morphologic variability within the male processus basimerus ventralis (p.b.v. of segment IX of C. personatus subspecies, three morphotypes have been recognised. The male polymorphism detected, would be the result of both host confinement and genetic selection acting on the parasite. It should be pointed out that C. (C. apertus personatus is not narrowly host-specific, therefore further studies are required to clarify this taxonomic situation.

  4. Caracterización molecular y cariológica de cuatro especies del Género Proechimys (Rodentia: echimyidae, en una colonia en cautiverio en el Instituto Nacional de Salud (Colombia

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    Fernando García Luis

    2004-12-01

    Full Text Available En el presente trabajo se realizó la caracterización cariológica y molecular de cuatro especies pertenecientes al género Proechimys, las cuales fueron colectadas en diferentes regiones de Colombia y posteriormente ubicadas en colonias en el Bioterio de Experimentación del Instituto Nacional de Salud-INS. El número estimado de especies varía según el criterio de diferentes autores lo cual reflejan la gran dificultad para establecer límites en Proechimys a sus taxones subordinados. En general, los caracteres morfológicos son la aproximación usual para evaluar las preguntas sistemáticas por la mayoría de mastozoólogos, pero ésto ha sido relativamente improductivo en Proechimys. Como consecuencia de las variaciones morfológicas presentadas en los individuos, varios autores se han centrado sobre este aspecto, buscando la manera más adecuada de establecer diferencias entre las especies y han recurrido a técnicas de tipo genético y molecular que
    permitan esclarecer la separación específica de los grupos. Para este trabajo la caracterización cariológica se llevó a cabo a partir de la técnica de cultivo de linfocitos de sangre periférica. La caracterización molecular se realizó a partir de un fragmento de 800 pares de bases del gen Citocromo B. Para la construcción de los árboles se utilizaron otras secuencias para Proechimys, disponibles en Genbank y se incluyeron secuencias suministradas, en calidad de préstamo, por el Doctor James Patton de la Universidad de California, Berkeley. Se confirmó, por medio de información cariológica y molecular, que los individuos de la colonia del INS pertenecen a cuatro especies diferentes las cuales fueron identificadas como: Proechimys chrysaeolus (departamento de Santander, P. sp. “Barinas” (departamento de Casanare, P. oconnelli (departamento de Casanare y P. canicollis (departamento de La Guajira. Los tiempos de divergencia obtenidos para las especies (entre 2,89
    MA y 5,92 MA se aproximan al Mioceno, época en la cual se presume que Proechimys evolucionó en la Amazonia. Tres de las cuatro especies de este estudio son incluidas dentro de los grupos propuestos por Patton (1987: P. chrysaeolus, grupo trinitatus, P. canicollis, grupo canicollis (monotípico y P. oconnelli, grupo semispinosus. La forma nominal P. sp. “Barinas” no es referida por este autor.

  5. About rats and jackfruit trees: modeling the carrying capacity of a Brazilian Atlantic Forest spiny-rat Trinomys dimidiatus (Günther, 1877 – Rodentia, Echimyidae – population with varying jackfruit tree (Artocarpus heterophyllus L. abundances

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    JHF Mello

    Full Text Available We carried out a six-year study aimed at evaluating if and how a Brazilian Atlantic Forest small mammal community responded to the presence of the invasive exotic species Artocarpus heterophyllus, the jackfruit tree. In the surroundings of Vila Dois Rios, Ilha Grande, RJ, 18 grids were established, 10 where the jackfruit tree was present and eight were it was absent. Previous results indicated that the composition and abundance of this small mammal community were altered by the presence and density of A. heterophyllus. One observed effect was the increased population size of the spiny-rat Trinomys dimidiatus within the grids where the jackfruit trees were present. Therefore we decided to create a mathematical model for this species, based on the Verhulst-Pearl logistic equation. Our objectives were i to calculate the carrying capacity K based on real data of the involved species and the environment; ii propose and evaluate a mathematical model to estimate the population size of T. dimidiatus based on the monthly seed production of jackfruit tree, Artocarpus heterophyllus and iii determinate the minimum jackfruit tree seed production to maintain at least two T. dimidiatus individuals in one study grid. Our results indicated that the predicted values by the model for the carrying capacity K were significantly correlated with real data. The best fit was found considering 20~35% energy transfer efficiency between trophic levels. Within the scope of assumed premises, our model showed itself to be an adequate simulator for Trinomys dimidiatus populations where the invasive jackfruit tree is present.

  6. Gastrointestinal helminths (Cestoda, Chabertiidae and Heligmonellidae) of Pogonomys loriae and Pogonomys macrourus (Rodentia: Muridae) from Papua Indonesia and Papua New Guinea with the description of a new genus and two new species.

    Science.gov (United States)

    Smales, L R

    2014-11-28

    Pieces of cestode, not indentified further, and 12 species of nematode including 1 new genus, 3 new species and 7 putative new species from the Families Chabertiidae and Heligmonellidae were collected from the digestive tracts of 16 Pogonomys loriae and 19 P. macrurous (Murinae: Hydromyini) from Papua, Indonesia and Papua New Guinea. The chabertiid Cyclodontostomum purvisi and the heligmonellid Odilia mackerrasae have been described previously from endemic murids. Hasanuddinia pogonomyos n. sp. can be distinguished from its congeners by the number of ridges in the synlophe, length of spicules and having a vagina with a dorsal diverticulum. Odilia dividua n. sp. is larger than its congeners, has a longer oesophagus, relatively shorter spicules and larger eggs. Pogonomystrongylus domaensis n. gen., n. sp. differs from all other genera in the Heligmonellidae in the characters of the synlophe, 7-10 ridges oriented sub frontally with a single left ventral ridge hypertrophied. Species richness of the nematode assemblages of P. loriae and P. macrourus are comparable to those of Abeomelomys sevia, Chiruromys vates and Coccymys rummleri when numbers of hosts examined are considered. Species composition was distinctive with 12, including the 7 putative species, of 14 species presently known only from species of Pogonomys. Similarities between the nematode fauna of endemic rodent hosts from Indonesia and Papua New Guinea were noted.

  7. Trichostrongylina (Nematoda, Heligmosomoidea coparasites in Dasyprocta fuliginosa Wagler (Rodentia, Dasyproctidae from Brazil, with the re-establishment of the genus Avellaria Freitas & Lent and the description of two new species Trichostrongylina (Nematoda, Heligmosomoidea co-parasitos em Dasyprocta fuliginosa Wagler (Rodentia, Dasyproctidae do Brasil, com o restabelecimento do gênero Avellaria Freitas & Lent e a descrição de duas novas espécies

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    Marie C. Durette-Desset

    2006-06-01

    Full Text Available Two new tichostrongylid nematodes of the family Viannaiidae Durette-Desset & Chabaud, 1981 coparasites in Dasyprocta fuliginosa Wagler, 1832 from the State of Amazonas, Brazil, are described: Viannella trichospicula sp. nov. is differentiated from the other species of the genus by the extreme slenderness of its spicules. Avellaria intermedia sp. nov. is distinguished from the single type species Avellaria avellari Freitas & Lent, 1934, by a smaller number of cuticular ridges (17 versus 27, a higher ratio of spicule length/ body length (8% versus 5.6% and spicules with a single tip. This genus, synonymized with the genus Viannella Travassos, 1918, by Durette-Desset (1968 is re-established, the female being didelphic. It is the first record of a nematode of the family Viannaiidae in a host of the family Dasyproctidae Bonaparte, 1838.Dois novos nematóides tricostrongilídeos da família Viannaiidae Durette-Desset & Chabaud, 1981 co-parasitos em um espécime de Dasyprocta fuliginosa Wagler, 1832 do Estado do Amazonas, Brasil, são descritos: Viannella trichospicula sp. nov. distingue-se das espécies do gênero, pelos espículos extremamente delgados. Avellaria intermedia sp. nov. diferencia-se da espécie tipo e única do gênero Avellaria avellari Freitas & Lent, 1934, pelo menor número de arestas cuticulares (17 comparado a 27, pela maior relação entre o tamanho do espículo e o comprimento do corpo (8% comparado a 5,6% e espículos com extremidade única. Este gênero, que havia sido considerado sinônimo de Viannella Travassos, 1918, por Durette-Desset (1968, é restabelecido; as fêmeas são didelfas. Este é o primeiro registro de um nematóide da família Viannaiidae em um hospedeiro da família Dasyproctidae Bonaparte, 1838.

  8. Patrones de distribución geográfica de la riqueza de especies de roedores de la tribu Oryzomyini (Rodentia: Sigmodontinae en Sudamérica: Evaluando la importancia de los procesos de colonización y extinción Geographic patterns of richness distribution of rodents species from the Oryzomyini tribe (Rodentia: Sigmodontinae in South America: Evaluating the importance of colonization and extinction processes

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    EVELYN VALENCIA-PACHECO

    2011-09-01

    Full Text Available La tribu de roedores Oryzomyini es la más diversa dentro de la subfamilia Sigmodontinae. Está constituida por 120 especies y 31 géneros, de las cuales 83 son endémicas del continente sudamericano. Este grupo exhibe una extensa distribución que abarca toda la región Neotropical, caracterizada por la presencia de una mayor riqueza en la Amazonia con una disminución monotónica hacia el sur y norte de Sudamérica. Este es un patrón bastante conocido en la mayoría de los taxones, por lo que se han propuesto varios mecanismos causales. Sin embargo, se desconocen los mecanismos que dan cuenta de este gradiente latitudinal en la riqueza de especies de Oryzomyini. Debido a que estas especies son originarias de la Amazonia, y que a través de su historia colonizaron ambientes nuevos y más variables (sur y norte, se evaluó la hipótesis fuente-sumidero, mediada por procesos de colonización y extinción, como potencial explicación al patrón de riqueza observado. Para evaluar esta hipótesis se reunió una base de datos de distribución y riqueza de especies por grado de latitud para todo el continente sudamericano. Posteriormente se evaluó el grado de anidamiento mediante los índices de T (temperatura, BR (discrepancia y NODF. Nuestros resultados evidenciaron un grado de anidamiento significativo en la distribución de Oryzomyini, y un anidamiento significativo separadamente en filas y columnas de la matriz. Por lo tanto, se concluye que la dinámica fuente-sumidero afecta el patrón de distribución de la riqueza de roedores Oryzominos, a través de un proceso de colonización durante su expansión en Sudamérica que fue mediado por los rangos de tolerancia de las especies. Finalmente, las especies menos tolerantes se habrían extinguido, lo que determinaría un menor número de especies hacia el sur y norte de la Amazonia.The Oryzomyini rodent tribe is the most diverse taxon within the Sigmodontinae subfamily. This tribe includes 120 species and 31 genera, of which 83 are endemic to the South American continent. This tribe presents a wide distribution, covering the entire Neotropical biogeographic province, and is characterized by the presence of greater richness in the Amazonian area, with a monotonic decrease towards the south and north of South America. This pattern is well-known in many taxa, for which various causal mechanisms have been proposed. However, the mechanisms that explain this pattern of species richness along the latitudinal gradient in the Oryzomyini tribe are unknown. Given that these species are native to Amazonia, and that throughout their history they colonized new and more variable environments (towards the south and north, we evaluated the source-sink hypothesis, mediated by processes of colonization and extinction, as a potential explanation for the observed pattern of richness. To test this hypothesis we built a database of species' distribution and richness every one degree of latitude for the entire South American continent. Subsequently we assessed the degree of nestedness using the T (temperature, BR (discrepancy and NODF indices. Our results show a significant degree of nesting in the Oryzomyini distribution, and a significant degree of nesting of the rows and columns of the data matrix, separately. Therefore, we conclude that source-sink dynamics affect the pattern of richness distribution of Oryzomine rodents, through a process of colonization during its expansion in South America, which was conditioned by the range of tolerance of the species. This resulted in the extinction of the less tolerant species, which finally resulted in a lower number of species towards the south and north of Amazonia.

  9. Varela-Mato, V.; Cancela, J.M.; Ayan, C.; Molina, A.; Martín, V. Lifestyle and Health among Spanish University Students: Differences by Gender and Academic Discipline. Int. J. Environ. Res. Public Health 2012, 9, 2728–2741

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    Vicente Martín

    2013-08-01

    Full Text Available The authors wish to make the following correction to this paper [1]. In the article it is mentioned that “the study obtained the approval of the university’s Students Vice-Chancellery and the government bodies of the involved academic centers and also by the Ethics Committee of the University of Vigo.” However, it should read: “The study obtained the approval of the university’s Students Vice-Chancellery and the government bodies of the involved academic centers” only.

  10. EL HECHO RELIGIOSO Y LA AYUDA SOCIAL. ESTUDIOS SOBRE SU HISTORIA, EPISTEMOLOGÍA Y PRÁCTICA. BELÉN LORENTE MOLINA, EDITORA. CORPORACIÓN COLOMBIANA DE INVESTIGACIONES HUMANÍSTICAS-CENTRO UNIVERSITARIO DE ESTUDIOS SOCIALES, UNIVERSIDAD DE CÁDIZ. BOGOTÁ, 2002

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    Carlos Vladimir Zambrano

    2012-04-01

    y prácticas. También puede ser útil a aquellos investigadores que indagan sobre culturas profesionales o del trabajo. "Este libro -dice ella- es de interés para quienes busquen teóricas para la práctica de la acción social, y para aquellos que se preocupen por su relación con las tradiciones de ayuda, por su lugar en la historia, y por la necesidad de considerarlas para una epistemología de la acción" (p. XVII. El libro aborda el hecho religioso en forma académica, rigurosa y no confesional.

  11. Cressier Patrice, Fierro Maribel, Molina Luis (ed., Los Almohades : problemas y perspectivas, Madrid, Consejo superior de investigaciones científicas, 2005 (Estudios árabes e islámicos : monografías, 11, 2 vol., 1 230 p.

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    Dominique Valérian

    2009-09-01

    Full Text Available En réunissant les actes de trois séminaires organisés entre 2000 et 2002 à la Casa de Velázquez de Madrid sur les Almohades, ce volumineux ouvrage entend faire le point sur les « problèmes et perspectives » de l’histoire de ce qui fut à la fois un mouvement idéologique et religieux, une dynastie et un empire qui marquèrent profondément l’histoire du Maghreb médiéval. Un de ses mérites est de rassembler, autour de cette période charnière, historiens, philologues, archéologues, historiens de l’...

  12. SORIANO DÍAZ, Ramón; ALARCÓN CABRERA, Carlos; MORA MOLINA, Juan (Directores). Diccionario crítico de los derechos humanos. Huelva (España): Universidad Internacio-nal de Andalucia, Sede Iberoamericana, 2000. 315 p.

    OpenAIRE

    Sousa Junior, José Geraldo de

    2009-01-01

    A disposição para o exame deste belo projeto, a edição de um dicionário crítico de direitos humanos, não advém apenas da concordância com as razões da iniciativa. De fato, estou de acordo com os diretores e coordenadores da edição, quanto aos motivos e à oportunidade da publicação da obra: “o interesse social que suscita esta classe de direitos pela relevância do bens jurídicos protegidos, o extraordinário desenvolvimento normativo e institucional, ao nível interno-estatal e internacional, na...

  13. Hantavirus infection prevalence in wild rodents and human anti-hantavirus serological profiles from different geographic areas of South Brazil.

    Science.gov (United States)

    Raboni, Sonia M; Delfraro, Adriana; de Borba, Luana; Teixeira, Bernardo R; Stella, Vanessa; de Araujo, Marina R; Carstensen, Suzana; Rubio, Giselia; Maron, Angela; Lemos, Elba R S; D'Andrea, Paulo S; Duarte dos Santos, Claudia N

    2012-08-01

    Paraná state presents the fourth highest number of accumulated cases of hantavirus pulmonary syndrome in Brazil. To map the risk areas for hantavirus transmission we carried out a study based on rodent trapping and determined the anti-hantavirus seroprevalence in these animals and in the inhabitants of these localities. Overall seroprevalence in rodents and humans were 2.5% and 2.4%, respectively. Eighty-two percent of the seropositive rodents were genetically analyzed. Phylogenetic analyses revealed that hantaviruses from rodent samples cluster with Araucária (Juquitiba-like) or Jaborá hantavirus genotypes. The Jaborá strain was identified in Akodon serrensis and Akodon montensis, whereas the Araucária strain was detected in Oligoryzomys nigripes, Oxymycterus judex, A. montensis, and Akodon paranaensis, with the latter species being identified for the first time as a natural host. These findings expose the complex relationships between virus and reservoirs in Brazil, which could have an impact on hantavirus transmission dynamics in nature and human epidemiology.

  14. Population ecology of hantavirus rodent hosts in southern Brazil.

    Science.gov (United States)

    Teixeira, Bernardo R; Loureiro, Nathalie; Strecht, Liana; Gentile, Rosana; Oliveira, Renata C; Guterres, Alexandro; Fernandes, Jorlan; Mattos, Luciana H B V; Raboni, Sonia M; Rubio, Giselia; Bonvicino, Cibele R; dos Santos, Claudia N Duarte; Lemos, Elba R S; D'Andrea, Paulo S

    2014-08-01

    In this study we analyze population dynamics of hantavirus rodent hosts and prevalence of infection over a 2-year period in Southern Brazil, a region with a high incidence of hantavirus pulmonary syndrome. The 14 small mammal species captured were composed of 10 rodents and four marsupials, the six most abundant species being Akodon serrensis, Oxymycterus judex, Akodon montensis, Akodon paranaensis, Oligoryzomys nigripes, and Thaptomys nigrita. These species displayed a similar pattern with increasing population sizes in fall/winter caused by recruitment and both, increase in reproductive activity and higher hantavirus prevalence in spring/summer. Specific associations between A. montensis/Jaborá Virus (JABV) and O. nigripes/Juquitiba-like Virus (JUQV-like) and spillover infections between A. paranaensis/JABV, A. serrensis/JABV, and A. paranaensis/JUQV-like were observed. Spillover infection in secondary hosts seems to play an important role in maintaining JABV and JUQV-like in the hantavirus sylvatic cycle mainly during periods of low prevalence in primary hosts.

  15. Small mammal populations of an agroecosystem in the Atlantic Forest domain, southeastern Brazil

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    PS. D’Andrea

    Full Text Available This study reports 2 years of the population dynamics and reproduction of a small mammal community using the removal method. The study was conducted in a rural area of the Atlantic Forest, in Sumidouro, Rio de Janeiro State, Brazil. The population sizes, age structure and reproduction were studied for the four most common species in the study area. The overall diversity was 1.67 and ranged between 0.8 to 1.67. The species richness was 13 considering the whole study. The most abundant species were the rodents Nectomys squamipes (n = 133, Akodon cursor (n = 74, Oligoryzomys nigripes (n = 25 and the marsupials Didelphis aurita (n = 58 and Philander frenatus (n = 50. Seven other rodents were captured once: Necromys lasiurus, Akodon montensis, Sooretamys angouya, Oecomys catherine, Oxymycterus judex, Euryzygomatomys spinosus and Trinomys iheringi. There were higher peaks for diversity and species richness during the winter (dry months, probably due to higher food availability. The marsupials had a seasonal reproduction with highest population sizes at the end of the rainy seasons. Nectomys squamipes reproduced mostly during rainy periods. Akodon cursor reproduced predominantly in the winter with the highest population peaks occurring during this season. The analysis of the population dynamics of the rodent species indicated that no species behaved as an agricultural pest, probably due to the heterogeneous landscape of high rotativity of vegetable cultivation. Rodent populations were more susceptible to the removal procedure than marsupial ones.

  16. Small mammal populations of an agroecosystem in the Atlantic Forest domain, southeastern Brazil.

    Science.gov (United States)

    D'Andrea, P S; Gentile, R; Maroja, L S; Fernandes, F A; Coura, R; Cerqueira, R

    2007-02-01

    This study reports 2 years of the population dynamics and reproduction of a small mammal community using the removal method. The study was conducted in a rural area of the Atlantic Forest, in Sumidouro, Rio de Janeiro State, Brazil. The population sizes, age structure and reproduction were studied for the four most common species in the study area. The overall diversity was 1.67 and ranged between 0.8 to 1.67. The species richness was 13 considering the whole study. The most abundant species were the rodents Nectomys squamipes (n = 133), Akodon cursor (n = 74), Oligoryzomys nigripes (n = 25) and the marsupials Didelphis aurita (n = 58) and Philander frenatus (n = 50). Seven other rodents were captured once: Necromys lasiurus, Akodon montensis, Sooretamys angouya, Oecomys catherine, Oxymycterus judex, Euryzygomatomys spinosus and Trinomys iheringi. There were higher peaks for diversity and species richness during the winter (dry) months, probably due to higher food availability. The marsupials had a seasonal reproduction with highest population sizes at the end of the rainy seasons. Nectomys squamipes reproduced mostly during rainy periods. Akodon cursor reproduced predominantly in the winter with the highest population peaks occurring during this season. The analysis of the population dynamics of the rodent species indicated that no species behaved as an agricultural pest, probably due to the heterogeneous landscape of high rotativity of vegetable cultivation. Rodent populations were more susceptible to the removal procedure than marsupial ones.

  17. Spot-on Treatments of Diflubenzuron and Permethrin to Control a Guinea Pig Louse, Gliricola Porcelli (Phthiraptera: Gyropidae)

    Science.gov (United States)

    Guinea pigs (Cavia porcellus (L.)) (Rodentia: Caviidae) are pets and laboratory animals. They can be infested by a chewing louse, Gliricola porcelli (Schrank) (Phthiraptera: Gyropidae), which is fairly common in some animal rearing facilities, pet stores, and on wild guinea pigs. Infestation with G....

  18. Phylogenetic analyses of complete mitochondrial genome sequences suggest a basal divergence of the enigmatic rodent Anomalurus

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    Gissi Carmela

    2007-02-01

    Full Text Available Abstract Background Phylogenetic relationships between Lagomorpha, Rodentia and Primates and their allies (Euarchontoglires have long been debated. While it is now generally agreed that Rodentia constitutes a monophyletic sister-group of Lagomorpha and that this clade (Glires is sister to Primates and Dermoptera, higher-level relationships within Rodentia remain contentious. Results We have sequenced and performed extensive evolutionary analyses on the mitochondrial genome of the scaly-tailed flying squirrel Anomalurus sp., an enigmatic rodent whose phylogenetic affinities have been obscure and extensively debated. Our phylogenetic analyses of the coding regions of available complete mitochondrial genome sequences from Euarchontoglires suggest that Anomalurus is a sister taxon to the Hystricognathi, and that this clade represents the most basal divergence among sampled Rodentia. Bayesian dating methods incorporating a relaxed molecular clock provide divergence-time estimates which are consistently in agreement with the fossil record and which indicate a rapid radiation within Glires around 60 million years ago. Conclusion Taken together, the data presented provide a working hypothesis as to the phylogenetic placement of Anomalurus, underline the utility of mitochondrial sequences in the resolution of even relatively deep divergences and go some way to explaining the difficulty of conclusively resolving higher-level relationships within Glires with available data and methodologies.

  19. ANALYSES OF IMAGES OF LAGENARIA (LAGENARIA SICERARIA (MOLINA) STANDL.) IN PAINTING AS A SOURCE OF INFORMATION FOR THE HISTORY OF INTRODUCTION AND CROP ARCHEOGENETIC Анализ изображения лагенарии (Lagenaria siceraria (molina) standl.) в живописи как источник информации для истории интродукции и археогенетики культуры

    OpenAIRE

    Tsatsenko L. V.

    2013-01-01

    Works of painters of past is the source of information of crop domestication, use in horticultural, species diversity. Lagenaria crop images in painting can also be a resource for determining the morphological changes of the crop in evolution

  20. Thematic Categorization and Analysis of Peer Reviewed Articles in the LISA Database, 2004-2005. A Review of: Gonzalez-Alcaide, Gregorio, Lourdes Castello-Cogolles, Carolina Navarro-Molina, et al. “Library and Information Science Research Areas: Analysis of Journal Articles in LISA.” Journal of the American Society for Information Science and Technology 59.1 (2008: 150-4.

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    Carol Perryman

    2009-03-01

    Full Text Available Objective – To provide an updated categorization of Library and Information Science (LIS publications and to identify trends in LIS research.Design – Bibliometric study.Setting – The Library and Information Science Abstracts (LISA database via the CSA Illumina interface.Subjects – 11,273 item records published from 2004-2005 and indexed in LISA.Methods – First, a search was set up to retrieve all records from 2004-2005, limited to peer review items (called “arbitrated works” by the authors (150 and excluding book reviews. Second, thematic descriptor terms used for the records were identified. Frequency counts for descriptor term occurrence were compiled using Microsoft Access and Pajek software programs. From the results of this search, the top terms were analyzed using the Kamada-Kawai algorithm in order to eliminate descriptor term co-occurrence frequencies under 30. A cluster analysis was used to depict thematic foci for the remaining records, providing a co-word network that visually identified topic areas of most frequent publication. Conclusions were drawn from these findings, and recommendations for further research were provided.Main Results – The authors identified 18 “thematic research core fields” (152 clustered around three large categories, “World Wide Web”, “Education”, and “Libraries”, plus 12 additional peripheral categories, and provided a schematic of field interrelationships.Conclusion – Domains of greatest focus for research “continue to be of practical and applied nature,” (153 but include increased emphasis on the World Wide Web and communications technologies, as well as on user studies. A table of the most frequently occurring areas of research along with their top three descriptor terms is provided (Table1, 152 (e.g., “World Wide Web” as the top area of research, with “online information retrieval” (268 occurrences, “searching” (132 occurrences, and “web sites” (115 occurrences.

  1. Thematic Categorization and Analysis of Peer Reviewed Articles in the LISA Database, 2004-2005. A Review of: Gonzalez-Alcaide, Gregorio, Lourdes Castello-Cogolles, Carolina Navarro-Molina, et al. “Library and Information Science Research Areas: Analysis of Journal Articles in LISA.” Journal of the American Society for Information Science and Technology 59.1 (2008): 150-4.

    OpenAIRE

    Carol Perryman

    2009-01-01

    Objective – To provide an updated categorization of Library and Information Science (LIS) publications and to identify trends in LIS research.Design – Bibliometric study.Setting – The Library and Information Science Abstracts (LISA) database via the CSA Illumina interface.Subjects – 11,273 item records published from 2004-2005 and indexed in LISA.Methods – First, a search was set up to retrieve all records from 2004-2005, limited to peer review items (called “arbitrated works” by the authors...

  2. Fisica y vida cotidiana

    CERN Multimedia

    Méndez, R

    2002-01-01

    "Estaba harto de escuchar lo dificil que es ensenar fisica, interesar a los alumnos en gases, tiros parabolicos y campos magneticos. Por eso el profesor de Fisica de la Universidad de Murcia Rafael Garcia Molina decidio hace cinco anos dejar sin argumentos a sus colegas. Comenzo la busqueda de juguetes, regalos y objetos cotidianos para explicar la fisica" (1 page).

  3. Plant location and extraction procedure strongly alter the antimicrobial activity of murta extracts

    DEFF Research Database (Denmark)

    Shene, Carolina; Reyes, Agnes K.; Villarroel, Mario

    2009-01-01

    Leaves and fruits of Murta (Ugni Molinae Turcz.) growing in three locations of Chile with diverse climatic conditions were extracted by using ethanol/water mixtures at different ratios and the antimicrobial activity was assessed. Extracts containing the highest polyphenolic content were from murta...

  4. Map showing principal coal beds of the Clearmont Quadrangle, Sheridan County, Powder River basin, Wyoming

    Science.gov (United States)

    Molnia, C.L.

    1988-01-01

    This map is a product of field mapping and of photogrammetric mapping using color aerial photographs at a scale of approximately 1:24,000 (Molina, 1983). These geologic investigations were part of a project to map the principal coal beds of large parts of the Powder River basin for national coal resource assessment.

  5. Coupling 2D Finite Element Models and Circuit Equations Using a Bottom-Up Methodology

    Science.gov (United States)

    2002-11-01

    EQUATIONS USING A BOTTOM-UP METHODOLOGY E. G6mezl, J. Roger-Folch2 , A. Gabald6nt and A. Molina’ ’Dpto. de Ingenieria Eldctrica. Universidad Polit...de Ingenieria Elictrica. ETSII. Universidad Politdcnica de Valencia. PO Box 22012, 46071. Valencia, Spain. E-mail: iroger adie.upv.es ABSTRACT The

  6. Comment on ``A reduction of order two for infinite-order Lagrangians''

    Science.gov (United States)

    Damour, Thibault; Schäfer, Gerhard

    1988-02-01

    It is pointed out that the reduced two-particle Hamiltonian for the Wheeler-Feynman electrodynamics up to order c-4 was incorrectly calculated in the paper of Jaén, Llosa, and Molina. The correct expression is given, and shown to be equivalent (when e1/m1=e2/m2) to the Golubenkov-Smorodinskii Lagrangian.

  7. Nobel prize awarded to pioneers in ozone research

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1996-12-31

    This article details the achievements of the three individuals who shared the 1995 Nobel Prize in Chemistry - Paul Crutzen, Mario Molina, and F. Sherwood Rowland - for their work in atmospheric chemistry, particularly the chemical processes that deplete the ozone layer. Background information about the ozone layer is presented as well as highlights of the ozone research done by the prize winners.

  8. Reference: 19 [Arabidopsis Phenome Database[Archive

    Lifescience Database Archive (English)

    Full Text Available 19 http://metadb.riken.jp/db/SciNetS_ria224i/cria224u4ria224u12569131i Lopez-Molin... 410-8 12569131 2003 Feb Genes & development Chua Nam-Hai|Kinoshita Natsuko|Lopez-Molina Luis|Mongrand S辿bastien

  9. Conversando con... RAFAEL MONEO: el arquitecto y enseñante de arquitectura

    OpenAIRE

    Molina Siles, Pedro Javier; Torres Barchino, Ana María

    2014-01-01

    [EN] Interview with Rafael Moneo [ES] Entrevista con Rafael Moneo Molina Siles, PJ.; Torres Barchino, AM. (2014). Conversando con... RAFAEL MONEO: el arquitecto y enseñante de arquitectura. EGA. Revista de Expresión Gráfica Arquitectónica. 19(24):36-49. doi:10.4995/ega.2014.3085. 36 49 19 24

  10. Robin Hoodist Oidipuseni / Pille-Riin Purje

    Index Scriptorium Estoniae

    Purje, Pille-Riin, 1963-

    1996-01-01

    'Ugala' külalisetendused Tallinnas: David Neilsoni 'Robin Hood' (lav. Peeter Tammearu); Mihhail Bulgakovi 'Poolearuline Jourdain' (lav. Üllar Saaremäe); Tirso de Molina 'Kadunud sõrmus' (lav. Andres Noormets); Talvo Pabuti 'Oidipuse kompleks' (lav. Andres Lepik); Anton Tshehhovi 'Kirsiaed' (lav. Kaarin Raid)

  11. Commerce Raiding: Historical Case Studies, 1755-2009

    Science.gov (United States)

    2013-10-01

    reproduced in Lucas Molina Franco and José María Manrique, Legion Condor: La historia olvidada (Valladolid, Sp.: Quirón, 2000), pp. 45–77. 34. For the...Condor: La historia olvidada. Valladolid, Sp.: Quirón, 2000. Frank, Willard C., Jr. “German Clandestine Submarine Warfare in the Spanish Civil War

  12. Programa de educación emocional y gestión del estrés en la Escuela Universitaria de Trabajo Social de Santiago de Compostela

    OpenAIRE

    Rodríguez Piñeiro, Alba

    2013-01-01

    Màster en Educació Emocional i Benestar, Facultat de Pedagogia, Departament de Mètodes d’Investigació i Diagnòstic en Educació, Universitat de Barcelona, curs: 2012-2013, Tutor/Tutora: Mª Cruz Molina Garuz

  13. Commensal Bacteria Control Cancer Response to Therapy by Modulating the Tumor Microenvironment | Poster

    Science.gov (United States)

    Noriho Iida, Amiran Dzutsev, C. Andrew Stewart, Loretta Smith, Nicolas Bouladoux, Rebecca A. Weingarten, Daniel A. Molina, Rosalba Salcedo, Timothy Back, Sarah Cramer, Ren-Ming Dai, Hiu Kiu, Marco Cardone, Shruti Naik, Anil K. Patri, Ena Wang, Francesco M. Marincola, Karen M. Frank, Yasmine Belkaid, Giorgio Trinchieri, Romina S. Goldszmid Science 342(6161):967-970, 2013

  14. Multiperspectivism in the Novels of the Spanish Civil War

    DEFF Research Database (Denmark)

    Hansen, Hans Lauge

    2011-01-01

    stereotyp-opfattelsen af borgerkrigen som en konfrontation mellem det Gode og det Onde. De fire romaner er Javier Cercas' Soldados de Salamina (2001), Alberto Méndez' Los girasoles ciegos (2004), Antonio Muñoz Molina's La noche de los tiempos (2009) og Isaac Rosas Otra maldita novela sobre la guerra civil...

  15. Oportuna compilación

    Directory of Open Access Journals (Sweden)

    Darío Fajardo Montaña

    1986-01-01

    Full Text Available El problema social agrario en Colombia. El pensamiento liberal en la solución del problema agrario. Hernán Toro Agudelo. Ediciones Tercer Mundo, Bogotá, 1984. 435 págs. Orión Agudelo Toro , compilador. Prólogo de Gerardo Molina.

  16. Organic carbon and iron modulate nitrification rates in mangrove swamps of Goa, south west coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    Krishnan, K.P.; LokaBharathi, P.A.

    , Publishers, San Diego, CA. 275p. Qasim, S.Z., Wafar, M.V.M.,1990. Marine resources in the tropics. Resource Management and Optimization 7,141–169. Rivera-Monroy, V.H., Day, J.D., Twilley, R.R., Vera-Herrera, F., Coronado-Molina 1995.Flux of nitrogen...

  17. Reference: 299 [Arabidopsis Phenome Database[Archive

    Lifescience Database Archive (English)

    Full Text Available 299 http://metadb.riken.jp/db/SciNetS_ria224i/cria224u4ria224u16293760i Lipka Volker...t Riyaz|Brandt Wolfgang|Dittgen Jan|Landtag Jörn|Lipka Volker|Llorente Francisco|Molina Antonio|Parker Jane|

  18. Divulgación de la ciencia será prioridad para nuevo Ministro de Ciencia y Tecnología

    OpenAIRE

    Vindas Segura, Manrique

    2013-01-01

    El ingeniero Alejandro Cruz Molina, nuevo ministro de Ciencia y Tecnología, creará la Red de Comunicación de la Ciencia, la Tecnología y la Innovación (RedCyTec) mediante decreto ejecutivo para potenciar una mayor comunicación de la ciencia en el país.

  19. Secciones eficaces en un sistema hamiltoniano con tres grados de libertad /

    OpenAIRE

    2011-01-01

     tesis que para obtener el grado de Doctor en Ciencias (Física), presenta Wilhelm Pablo Karel Zapfe Zaldivar ; asesor Christof Jung Kohl, Luis Benet Fernández, Carlos Federico Bunge Molina. IV, 74 páginas : ilustraciones. Doctorado en Ciencias (Física) UNAM, Facultad de Ciencias, 2011

  20. Ord der forandrer

    DEFF Research Database (Denmark)

    rolle som kritisk og historisk bevidsthed. Værker af så forskellige forfattere som Durif, Tabucchi, Houellebecq, Molinas, Mertens og Antunes tager Sartres grundlæggende spørgsmål om litteraturens samfundsmæssige funktion op igen og bliver analyseret i antologien, der tager forholdet mellem litteratur og...