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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. 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.

  4. 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.

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

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    Víctor Pacheco; Córdova, Jesús H; Margarita Velásquez

    2012-01-01

    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 an...

  6. 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.

  7. 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.

  8. Topography of the medullar cone in nutria (Myocastor coypus Molina, 1782 – Rodentia: Mammalia

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    Arlei José Birck

    2009-06-01

    Full Text Available Aiming to investigate the topography of the medullar cone, ten adult nutria (Myocastor coypus, eight male and two female, were previously fixed in 10% aqueous formalin solution, maintained in similar solution and dissected. After the dissection the following data were noted: a the medullar cone apex was close to the fifth lumbar vertebra (L5 in five animals (50.0%, between L5 and L6 in three animals (30.0%, between L4 and L5 in one animal (10.0%, and just above L6 in one animal (10.0%; b the medullar cone base was observed between L3 and L5 in nine animals (90.0%, and in one animal alone (10.0% it was found between the L4 and L5 vertebrae. This Myocastor coypus presented six lumbar vertebrae.

  9. 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.

  10. 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.

  11. 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.

  12. 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

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

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    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.

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

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    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

  15. Antonio Muñoz Molina entre literatura y periodismo: Las columnas

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    Jean-Pierre Castellani

    2001-11-01

    Full Text Available Article tradition in Spain lives today in newspaper columns. In this paperwork a selection of Muñoz Molina's columns is studied in order to characterize them. Columns are constructed by using quotations of other authors and stylized anecdotes. Related to fiction works by the same author, they constiíute the basic elements of the stories' narrative matter. Columnism in Muñoz Molina's narrative is no longer a secondary or marginal genre: they are part of the creative ensemble elaborated besides his fiction works, which are enriched with this weekly insight.

  16. 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; Gonzalo Silva A; J. Concepción Rodríguez M; Susana Fischer G; Nelson Zapata S.M

    2010-01-01

    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 may...

  17. Free radical scavenging potential of Lagenaria siceraria (Molina) Standl fruits extract

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    Vijayakumar Mayakrishnan; Selvi Veluswamy; Priya Kannappan; Noorlidah Abdullah

    2013-01-01

    Objective: To elucidate free radical scavenging activity of ethanolic extract Lagenaria siceraria (L. siceraria) (Molina) fruit. Methods: The free radical scavenging activity of the L. siceraria (Molina) fruit extract was assayed by using α,α-diphenyl-β-picrylhydrazyl (DPPH), 2,20-azinobis 3-ethyl benzothiazoline-6-sulfonate (ABTS), FRAP, reducing power, chelating ability and β-carotene bleaching assay. Results: The IC50 values of DPPH and ABTS radical-scavenging activity was found to be 1.95 mg/mL and 19 mg/mL, respectively. In ferrous chelation assay, the percentage of inhibition was found to be 89.21%. The reducing power of ethanolic extract of L. siceraria (Molina) fruit was 0.068 at 1 mg/mL and increased to 0.192 at 5 mg/mL. Theβ-carotene linoleate bleaching assay was 46.7% at 5 mg/mL and antioxidant activity using FRAP at 0.305 for 1 mg/mL to 0.969 for 5 mg/mL. Conclusions: The results indicate that L. siceraria (Molina) fruit could be an important sources of natural radical scavengers.

  18. Recasting Madrid and Its Characters in Munoz Molina's "Los misterios de Madrid"

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    Long, Sheri Spaine

    2009-01-01

    "Los misterios de Madrid" (1992) provides a burlesque novelistic portrayal of the changing capital city and its inhabitants in the early 1990s. Spanish writer Antonio Munoz Molina creates vignettes of Madrid's people and places while showing the capital as a destination for both foreign-born immigrants and provincial Spaniards alike. In…

  19. «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.

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

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    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.

  1. 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.

  2. 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.

  3. 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

  4. Exilios y nostalgias: Antonio Muñoz Molina y Milán Kundera

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    Gallego Cuiñas, Ana

    2007-01-01

    En los albores del siglo XXI y bajo el signo de la posmodernidad, Antonio Muñoz Molina y Milán Kundera llevan a cabo en “Valdemún”-un capítulo de Sefarad- y La ignorancia una serie de operaciones y articulaciones narrativas que tienen un común denominador: el tratamiento de las “interrogaciones existenciales” del exilio y la nostalgia. Ambos autores fraguan poéticas similares en lo que a la representación del horror del pasado se refiere, y apuestan en estos textos por un resca...

  5. 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.

  6. 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

  7. 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.

  8. How Race Is Made in America: Immigration, Citizenship, and the Historical Power of Racial Scripts by Natalia Molina

    OpenAIRE

    Guevara-Velez, Lucy

    2015-01-01

    Natalia Molina presents a critical analysis of the period 1924-1965 in U.S. immigration policy and provides an opportunity for readers to examine the racialization of Mexicans in the United States and its impact on immigration legislation and naturalization.

  9. 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.

  10. 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.

  11. Experimental Infection of Calomys callosus (Rodentia, Cricetidae by Toxoplasma gondii

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    Favoreto-Junior Sílvio

    1998-01-01

    Full Text Available Calomys callosus, Rengger 1830 (Rodentia, Cricetidae, a wild rodent found in Central Brazil, was studied to investigate its susceptibility to Toxoplasma gondii experimental infection and its humoral immune response against this protozoa. The electrophoretic profile of the serum proteins of C. callosus showed that IgG, which shows no affinity to Protein A, has higher cross reactivity with rat IgG than with IgG from other rodents. The susceptibility assay was performed by inoculation groups of animals with various suspensions of T. gondii tachyzoites from 102 to 106 parasites. All animals died between 3 and 9 days after infection and the kinetics of antibody synthesis was determined. Basically, they recognized predominantly the immunodominant antigen SAG-1 (P30. The immunohistochemistry assays revealed that the liver was the most heavily infected organ, followed by the spleen, lungs, intestine, brain and kidneys. It can be concluded that C. callosus is an excellent experimental model for acute phase of Toxoplasma infection

  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. 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

  14. 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.

  15. Pollen germination capacity and viability in lagenaria siceraria (molina) standley (cucurbitaceae)

    International Nuclear Information System (INIS)

    Present investigation of pollen germination and viability pertain to a monoecious species Lagenaria siceraria (Molina) Standley belonging to Cucurbitaceae. The pollen germination was examined up to 48 weeks in different concentrations of sucrose and boric acid solutions using 'hanging drop technique'. Viability under storage was determined by storing pollen in different humidity conditions in a refrigerator (4 deg. C), freezer (-20 deg. C. -30 deg. C), freeze drier (-60 deg. C). The pollen were also treated in vacuum and in organic solvents. Pollen stored at low temperature showed better percentage of germination compared to pollen stored at 4 deg. C and fresh. Freeze dried pollen (- 60 deg. C) showed the highest percentage of germination. (author)

  16. 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.

  17. 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.

  18. 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.

  19. 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.

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

    OpenAIRE

    André Filipe Testoni; Sérgio Luiz Althoff; André Paulo Nascimento; Francisco Steiner-Souza; Ives José Sbalqueiro

    2010-01-01

    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 nin...

  1. Quillajasides A and B: New Phenylpropanoid Sucrose Esters from the Inner Bark of Quillaja saponaria Molina.

    Science.gov (United States)

    Maier, Christiane; Conrad, Jürgen; Steingass, Christof B; Beifuss, Uwe; Carle, Reinhold; Schweiggert, Ralf M

    2015-10-14

    The phenolic composition of freshly prepared aqueous extracts of the inner bark of Quillaja saponaria Molina was compared to that of commercially available Quillaja extracts, which are currently used as emulsifiers in foods and cosmetics. Major phenolics in both extracts were (+)-piscidic acid and several p-coumaroyl sucrose esters. Among the latter, two new compounds were isolated and characterized: α-l-rhap-(1→4)-α-l-rhap-(1→3)-(4-O-(E)-p-coumaroyl)-α-d-glup-(1→2)-(3-O-(E)-p-coumaroyl)-β-d-fruf (quillajaside A) and β-d-apif-(1→4)-α-l-rhap-(1→4)-α-l-rhap-(1→3)-(4-O-(E)-p-coumaroyl)-α-d-glup-(1→2)-(3-O-(E)-p-coumaroyl)-β-d-fruf (quillajaside B). In addition, a putative biosynthetic pathway of at least 20 structurally related p-coumaroyl sucrose esters was tentatively identified. Besides their antioxidant activity and their potential function as substrate for enzymatic browning reactions, the new compounds are highly characteristic for both the inner bark of Q. saponaria and commercial extracts derived therefrom. Consequently, they might serve as authenticity markers for the detection of Quillaja extracts in food and cosmetic formulations. PMID:26375986

  2. Arbuscular mycorrhizal infection in two morphological root types of Araucaria araucana (Molina) K. Koch.

    Science.gov (United States)

    Diehl, P; Fontenla, S B

    2010-01-01

    Araucaria araucana (Molina) K. Koch is a conifer distributed in the Andean-Patagonian forests in the south of Argentina and Chile. The main objective of this work was to relate the different root classes appearing in A. araucana to mycorrhizal behavior. Samples were collected in three different sites in the Lanín National Park (NW Patagonia, Argentina). Two different root classes were present in A. araucana: longitudinal fine roots (LFR) and globular short roots (GSR). Both had extensive mycorrhizal arbuscular symbiosis (AM) and presented abundant hyphae and coils in root cells, a characteristic of the anatomical Paris-type. Dark septate fungal endophytes were also observed. Values of total AM colonization were high, with similar partial AM% values for each root class. Seasonal differences were found for total and partial colonization, with higher values in spring compared to autumn. Regarding the percentage of fungal structures between root classes, values were similar for vesicles and arbuscules, but higher coil percentages were observed in GSR compared to LFR. The percentages of vesicles increased in autumn, whereas the arbuscule percentages increased in spring, coinciding with the plant growth peak. Results show that both root classes of A. araucana in Andean-Patagonian forests are associated with AM fungi, which may have ecological relevance in terms of the importance of this symbiosis, in response to soil nutrient-deficiencies, especially high P-retention. PMID:20589337

  3. 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.

  4. 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.

  5. 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.

  6. 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.

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

    Directory of Open Access Journals (Sweden)

    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.

  8. The first complete mitochondrial genome of Pyrrhura sp.--question about conspecificity in the light of hybridization between Pyrrhura molinae and Pyrrhura rupicola species.

    Science.gov (United States)

    Urantowka, Adam Dawid; Strzała, Tomasz; Grabowski, Krzysztof Aleksander

    2016-01-01

    The genus Pyrrhura contains at least 24 species widespread mainly through South America. Pyrrhura molinae (Green-cheeked Conure) and Pyrrhura rupicola (Black-capped Conure) are treated as separate species based on morphological differences. Geographical ranges of these two species overlap in southern Peru. However, it is not clear if they occur there sympatrically or it is a hybridization zone. Some taxonomists conjecture their conspecific character, as possible hybrid individuals have been found in Puno region. We sequenced mitochondrial genome of specimen with phenotype typical for P. molinae. To confirm its species belonging, we aligned CYTB and control region (CR) sequences with adequate sequences of 21 Pyrrhura species. Surprisingly, analyzed P. molinae individual grouped together with two different individuals of P. rupicola species. Such incompatibility of genetic data with morphology may be only the result of these two species hybridization.

  9. 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

    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...

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

    OpenAIRE

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

  11. Narrativa de indios en las Historias naturales de Juan Ignacio Molina y Felipe Gómez de Vidaurre

    OpenAIRE

    Hachim Lara, Luis

    2013-01-01

    Los naturalistas europeos abordaron a los aborígenes de América, recurriendo a las narraciones que el archivo occidental poseía y que estaba a disposición de la racionalidad ilustrada en perspectiva de la administración colonial. A su vez, los criollos letrados, confrontan su episteme –a veces diferenciada– con esas narrativas occidentalistas. Así, los jesuitas chilenos Juan Ignacio Molina y Felipe Gómez de Vidaurre en sus Historias naturales, investigarán las costumbres civiles del indígena ...

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

    OpenAIRE

    Marcel Gutiérrez-Correa

    2013-01-01

    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 infl...

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

    OpenAIRE

    DANIEL ALBERTO ÁLVAREZ WATSON; HENRY ORLANDO BOLAÑOS BURBANO; FRANCISCO ORLANDO VELÁSQUEZ VÁSQUEZ

    2012-01-01

    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 instituci...

  14. 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. PMID:26751869

  15. 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.

  16. 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. PMID:19145575

  17. Current status of Myoxids (Mammalia: Rodentia in Calabria (Southern Italy

    Directory of Open Access Journals (Sweden)

    Mara Cagnin

    1995-05-01

    Full Text Available Abstract Four species of Myoxids are presently known to live in the southern region of the Italian peninsula: Eliomys quercinus, Dryomys nitedula, Myoxus glis, Muscardinus avellanarius. The only paleontological evidence, dating from the Würm period, refers to E. quercinus, M. avellanarius and M. glis, which were found in caves of the Northern Thyrrenian Coast. The historical data concerning the Calabrian Myoxids, do not include the presence of Dryomys nitedula which was recorded for the first time in the Aspromonte Massif only in 1964 (von Lehmann, 1964. The actual geographical distribution of D. nitedula in Southern Italy seems to include the Calabrian and Basilicata mountains. The ecological distribution of D. nitedula seems to be tied to the presence of beech woods from 1300 m to 1800 m above sea level. Present knowledge concerning Calabrian Glirids is very scanty and fragmentary since no specific studies have been carried out. Most available data refer to Muscardinus avellanarius, a species frequently found in bird of prey pellets (mainly froin Tyto alba from sea level to 1300 m a.s.l., both in the sclerophyll and in the decidous biomes. By contrast, few data dealing with Eliomys quercinus exist probably due to a fragmented distribution within this region. Myoxus glis seems to be frequent and continous, in areas ranging from sea level to wooded mountains. Riassunto Stato delle conoscenze sui Mioxidi (Rodentia, Mammalia in Calabria - In Calabria, la regione più meridionale della penisola italiana, sono presenti quattro specie di Mioxidi: Eliomys quercinus, Dryomys nitedula, Myoxus glis e Muscardinus avellanarius. Gli scarsi dati paleontologici risalenti a1 Würm, di caverne della costa Tirrenica settentrionale segnalano la presenza

  18. 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...

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

    Directory of Open Access Journals (Sweden)

    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.

  20. [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.

  1. 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.

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

    OpenAIRE

    Franco, N. H.; Olosson, A.; J.B. Santos; Brosseron, F.; Pinto, A.; Ricardo, E.

    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...

  3. 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

  4. 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.

  5. 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.

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

    OpenAIRE

    Paulina Rivera; Gonzalo Silva; Inés Figueroa; Maritza Tapia; J. Concepción Rodríguez

    2014-01-01

    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 pr...

  7. 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.

  8. 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.

  9. 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.

  10. 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.

  11. 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.

  12. 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

    OpenAIRE

    Carolina Fredes; Gloria Montenegro; Juan Pablo Zoffoli; Miguel Gómez; Paz Robert

    2012-01-01

    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 a...

  13. 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.

  14. Tropos y fotos para establecer identidad en El jinete polaco de Antonio Muñoz Molina

    OpenAIRE

    Corbellini, Natalia

    2008-01-01

    A partir de la lectura de El jinete polaco Antonio Muñoz Molina se reflexiona sobre la construcción del discurso sobre la memoria histórica que realiza el autor en esta novela. Se analiza la utilización de fotos e imágenes como motivos a partir de los cuales los personajes arman su relato del pasado desde una perspectiva personal. Se pone en consideración este procedimiento con otras novelas del autor y como característica de autores contemporáneos.

  15. Control of the biological process through continuous measurement of the sludge age. Experiences in the WWTP Molina de Segura (Murcia, Spain)

    International Nuclear Information System (INIS)

    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.

  16. De la Historia moral a la Historia civil en el Compendio de la Historia Civil del Reyno de Chile (1787 del abate Juan Ignacio Molina

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    Luis Hachim Lara

    2008-01-01

    Full Text Available El jesuíta Juan Ignacio Molina escribió el Compendio de la Historia Geográfica, Natural y Civil deIReynodeChile (1776 y el Compendio de la HistoriaCivil del ReynodeChile (1787 en el exilio italiano. En los estudios sobre los jesuítas, sus Historias naturales no han sido exploradas en cuanto a la importancia cultural, literaria y crítica que implican. En este trabajo se tratarán algunos rasgos de la escritura de la Historia que constituyen el discurso de la ciencia y que muestran el desarrollo que va desde la Historia naturaly moral -que desde Aristótelesy Plinio representa la ciencia clásica- a los nuevos modos de conocer que representa el modelo de ciencia de la Ilustración. En consecuencia, el aporte del Abate Molina en su Compendio de la Historia Civil consiste en incorporar la concepción de progreso en los usos y costumbres de los indígenas, aportando una visión de integración diferente a la civilidad. Sabemos que con posterioridad al siglo dieciocho el aporte de muchos astrónomos, médicos y científicos jesuítas -en América- construyeron las bases de la ciencia moderna y progresiva, representando la continuidad más que la regresión en el desarrollo científico tal como lo concebimos actualmente.TheJesuit Juan Ignacio Molina vimte the Compendiode la Historia Geográfica, natural y Civil del Reyno de Chile (1776 y el Compendio de la Historia Civil del Reyno de Chile (1787 in exile in Italy. In relation to criticism, the thinking of the naturalist of the company in the transition -some see opposition-from the model of traditional and scholastic science to the paradigm of modern and enlightened science was importantThis assignment will consider some of the characteristics of the writing of history, which constitute the discourse of science and show the development from the moral and natural history -the classical science of Aristotle and Plinio- to the new forms of knowledge that represent the model of science of the enlight

  17. 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

  18. 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

  19. Karyological geographic variation of Oligoryzomys nigripes Olfers, 1818 (Rodentia, Cricetidae from Brazil

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    Roberta Paresque

    2007-01-01

    Full Text Available The karyotypes of 85 specimens of Oligoryzomys nigripes (Rodentia, Sigmodontinae collected in the Cerrado and Atlantic Forest of seven states of Brazil were analyzed. Eighty four specimens presented a karyotype with 2n = 62 and one individual had 2n = 61 due to a monosomy of the X chromosome. High levels of intra- and inter-population karyotypic variability, due to sex chromosomes heteromorphisms and pericentric inversions in four autosomes (pairs 2, 3, 4 and 8, led to a variation of the autosomal arm numbers (fundamental number, FN from 78 to 82. Synaptonemal complex analyses revealed normal meiosis in males heterozygous for pericentric inversions. We found 39 different cytotypes, 27 of which are herein described for the first time. A literature survey revealed 46 described karyotypes for O. nigripes. We tested the hypothesis that chromosomal variants frequencies are dependent on geographical distribution and we propose a model for the karyotypical evolution of Oligoryzomys nigripes with 2n = 62/FN = 78-82.

  20. 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.

  1. 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.

  2. 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.

  3. 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.

  4. Nitric oxide production by Peromyscus yucatanicus (Rodentia infected with Leishmania (Leishmania mexicana

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    Elsy Nalleli Loría-Cervera

    2013-04-01

    Full Text Available Peromyscus yucatanicus (Rodentia: Cricetidae is a primary reservoir of Leishmania (Leishmania mexicana (Kinetoplastida: Trypanosomatidae. Nitric oxide (NO generally plays a crucial role in the containment and elimination of Leishmania. The aim of this study was to determine the amount of NO produced by P. yucatanicus infected with L. (L. mexicana. Subclinical and clinical infections were established in P. yucatanicus through inoculation with 1 x 10 2 and 2.5 x 10 6 promastigotes, respectively. Peritoneal macrophages were cultured alone or co-cultured with lymphocytes with or without soluble Leishmania antigen. The level of NO production was determined using the Griess reaction. The amount of NO produced was significantly higher (p ≤ 0.0001 in co-cultured macrophages and lymphocytes than in macrophages cultured alone. No differences in NO production were found between P. yucatanicus with subclinical L. (L. mexicana infections and animals with clinical infections. These results support the hypothesis that the immunological mechanisms of NO production in P. yucatanicus are similar to those described in mouse models of leishmaniasis and, despite NO production, P. yucatanicus is unable to clear the parasite infection.

  5. 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.

  6. 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.

  7. 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.

  8. 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.

  9. [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

  10. 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

    Directory of Open Access Journals (Sweden)

    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

  11. 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.

  12. First description of the nymph and larva of Dermacentor compactus Neumann, 1901 (Acari: Ixodidae), parasites of squirrels (Rodentia: Sciuridae) in southeast Asia.

    Science.gov (United States)

    Apanaskevich, Dmitry A

    2016-05-01

    Recent reexamination of collection lots stored in the United States National Tick Collection revealed adult specimens of Dermacentor compactus Neumann, 1901 (Acari: Ixodidae) reared from field-collected nymphs, which allowed us to associate field-collected unidentified nymphs and larvae with this species. Nymphs of D. compactus can be easily distinguished from those of other congeneric species by the shape of the scutum and spiracular plate, the hypostome dentition, and the size of the spurs on the coxae. Larvae of this species can be distinguished by the shape and sculpture of the scutum, the shape of basis capituli, the absence of auriculae, and the size of the spurs on coxae II and III. Both nymphs and larvae feed mostly on various species of squirrels (Rodentia: Sciuridae). Considerably fewer nymphs and larvae were found on murid rodents (Rodentia: Muridae), domestic dogs (Carnivora: Canidae), and a snake (Squamata: Colubridae). PMID:27095664

  13. Método rápido de determinación del sexo en el erizo comestible Loxechinus albus (Molina, 1782) y su aplicación en estudios biológico-pesqueros Simple methodology to identify sex of sea urchin Loxechinus albus (Molina, 1782), and its application to fishery-biological studies

    OpenAIRE

    Sergio Palma G; Patricio Arana E

    1996-01-01

    La identificación del sexo en el erizo comestible Loxechinus albus (Molina, 1782), es difícil de realizar si no se realiza un análisis de laboratorio, lo que motiva que en la mayoría de las investigaciones efectuadas sobre este recurso se consideren ambos sexos en conjunto. En el presente artículo se describe una metodología simple para establecer el sexo en el erizo, lo que permite obtener parámetros biológico-pesqueros en forma separada para machos y hembras. A través de los procedimientos ...

  14. Occurrence of Conepatus chinga (Molina (Mammalia, Carnivora, Mustelidae and other terrestrial mammals in the Serra do Mar, Paraná, Brazil

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    Nilton C. Cáceres

    2004-09-01

    Full Text Available In this paper 19 additional mammalian species are reported in the Atlantic forest of the Paranean Serra do Mar, southern Brazil, including threatened and rare species. These findings resulted from a one-year field research in the western slope of the Serra do Mar, Piraquara municipality, with additional review of reports about mammal distribution in the region. Preliminarily mammal richness in the region is round 54 species, but this number could be higher with more systematic surveys, particularly with regards to bats. The occurrence of the hog-nosed skunk, Conepatus chinga (Molina, 1782, is reported for the first time in the eastern portion of Paraná, a State vastly deforested during the last century in Brazil.Neste artigo, 19 espécies adicionais de mamíferos são informadas para a Floresta Atlântica da Serra do Mar paranaense, sul do Brasil, incluindo espécies ameaçadas e raras. Este relato é resultado de uma pesquisa de campo de um ano na vertente oeste da Serra do Mar, município de Piraquara¸ com revisão adicional de relatos sobre a distribuição de mamíferos na região. A riqueza preliminar de mamíferos na Serra do Mar paranaense é de 54 espécies, mas este número poderá aumentar quando mais inventários faunísticos forem realizados, principalmente para morcegos. A ocorrência do cangambá, Conepatus chinga (Molina, 1782, é relatada pela primeira vez na porção leste do Paraná, um Estado altamente desflorestado neste último século no Brasil.

  15. 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.

  16. 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.

  17. Actividad de polvo, extractos y aceite esencial de Peumus boldus Molina solos y en mezcla con Bacillus thuringiensis Berliner contra Spodoptera frugiperda (J.E. Smith) y Helicoverpa zea (Boddie).

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    Silva Aguayo, Gonzalo Iván

    2010-01-01

    Se evaluaron en condiciones de laboratorio e invernadero las propiedades insecticidas del polvo, aceite esencial y extracto en cloruro de metileno de Boldo (Peumus boldus Molina), además del alcaloide boldina y el terpeno 1-8-cineol (eucaliptol), solos y en combinación con Bacillus thuringiensis Berliner contra larvas de Spodoptera frugiperda (J.E. Smith) y Helicoverpa zea Boddie. Se realizaron bioensayos para evaluar mortalidad, efecto en el ciclo de vida y las preferencias alimenticias de l...

  18. Introducción al estudio de las mineralizaciones del Señorío y Tierra de Molina de Aragón (Guadalajara, España)

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    Mata Perelló, José M.; Octavio PUCHE RIART

    1992-01-01

    In this communication it's efected an introduction to the study of the mineralizations placed in the Señorio and Tierra de Molina de Aragón an historical demarcation of Guadalajara situated in the Sistema Ibérico. In this comunication, we will introduce the Study Castilian mineralizations between them, C/Ag are present as well as stratiform iron and copper mineralization.

  19. 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

  20. 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)

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    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)

  1. 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.

  2. 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.

  3. 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.

  4. 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.

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

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    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. PMID:24309069

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

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    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...

  7. Distribución paleogeográfica de las unidades del Pérmico y del Triásico en el sector Molina de Aragón-Albarracín.

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    Pérez-Arlucea, Marta

    1987-01-01

    [ES] En los sistemas Pérmico y Triásico del sector Molina de Aragón- Albarracín (Cordillera Ibérica) se pueden diferenciar dieciséis unidades litoestratigráficas. La inferior no ha podido datarse en esta zona, pero por su posición estratigráfica y características litológicas puede ser equivalente a unidades descritas como "Autuniense" por autores previos, en áreas próximas. Por encima aparece una unidad terrígena correspondiente a las facies Saxoniense, que al SE es concorda...

  8. Tick infestations of the eastern cottontail rabbit (Sylvilagus floridanus) and small rodentia in northwest Alabama and implications for disease transmission.

    Science.gov (United States)

    Cooney, Joseph C; Burgdorfer, Willy; Painter, Martin K; Russell, Cynthia L

    2005-12-01

    Studies were conducted over a four-county area of northwest Alabama to determine the association of eastern cottontail rabbits with Dermacentor variabilis, the eastern United States vector of Rocky Mountain spotted fever. A secondary objective was to compare infestations of this tick on rabbits with infestations on commonly encountered rodent species as a means of determining the relative importance of each in the disease transmission cycle. These epidemiologic surveys were conducted in response to reported fatal cases of Rocky Mountain Spotted Fever in two counties of the study area. From 202 eastern cottontail rabbits, 3,956 ticks were collected. Of this total, 79.87% were Haemphysalis leporispalustris, 9.15% Amblyomma americanum, 8.22% Ixodes dentatus, and 2.76% D. variabilis. Only immature stages of D. variabilis were collected from cottontail rabbits. Ticks were collected on rabbits in all months except November, and only one specimen was taken in January. Based on the average number of ticks per host collected in each month, April was the peak month for D. variabilis and I. dentatus. High values for H. leporispalustris also occurred at this time, but even higher values occurred in October and December. The heaviest infestation of A. americanum occurred during the month ofAugust and coincides with the activity period for the larvae of this species. Two hundred sixty-nine of the smaller Rodentia, comprising 13 species, yielded 264 ticks, all D. variabilis, and all but two were immature stages. Five rodent species, Microtus ochragaster Orozomys palustris, Peromyscus gossypinus, Peromyscus leucopus, and Sigmodon hispidus accounted for 95.83% of the ticks collected, and appeared to be preferred hosts for D. variabilis; all five had higher infestation levels per host than did the eastern cottontail rabbit. Data on host relationships in association with seasonal activity are presented. PMID:16599149

  9. 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.

  10. 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.

  11. 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.

  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. 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

  14. 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

  15. Los sueños tristes de este amor extraño : Molina encuentra a la Manuela con guión de Puig, Donoso, Ripstein y Sarduy

    OpenAIRE

    Corbatta, Jorgelina

    2015-01-01

    Mi artículo explora la imagen del homosexual travesti como el producto/proyecto final de una construcción cuyas partes están en la figura de Molina en El beso de la mujer araña (l976) de Manuel Puig, la Manuela en El lugar sin límites (l966) de José Donoso y su adaptación al cine por Arturo Ripstein en el film homónimo (l976), en diálogo con textos de Sarduy sobre ambos escritores y, en especial, «Escritura/Travestismo» (Escrito sobre un cuerpo, l969).Tenemos entonces que en el lapso de diez ...

  16. El método retrospectivo en la enseñanza de la Historia : Algunas reflexiones a partir del compromiso docente de Susana Simián de Molinas

    OpenAIRE

    Diburzi, Nélida; Scaraffia, Inés

    2006-01-01

    Susana Simián de Molinas es una docente de larga y destacada trayectoria en la educación dentro de la ciudad de Santa Fe, donde trabajó en instituciones que en la década del 60 y primeros años de los ’70, fueron notables como ámbitos de experimentación pedagógica y didáctica. En la Argentina de entonces corrían tiempos de búsqueda, de innovación, de creatividad en todos los ámbitos; también eran tiempos de indagación y criticidad frente al pasado nacional, al cual se veía como una clave para ...

  17. 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

  18. 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.

  19. 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

  20. 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

  1. Relaciones filogenéticas de la tribu Abrotrichini (Rodentia, Cricetidae): análisis separados y combinados de evidencias morfológicas y moleculares

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    Teta, Pablo Vicente

    2013-01-01

    La tribu Abrotrichini (Rodentia, Cricetidae) es uno de los clados de Sigmodontinae más recientemente diagnosticados. Su distribución es fundamentalmente andino-patagónica, con mayor diversidad de especies en el sur de Argentina y Chile. En esta tesis se evaluaron las relaciones filogenéticas entre sus integrantes, utilizando 21 taxones terminales (20 vivientes y uno fósil) y un grupo externo (Wiedomys). Se realizó un análisis cladístico a través de búsquedas exactas y heurísticas de 99 caract...

  2. 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.

  3. 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.

  4. 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.

  5. Leishmaniose cutânea na Amazônia: isolamento de Leishmania (Viannia lainsoni do roedor Agouti paca (Rodentia: Dasyproctidae, no estado do Pará, Brasil Cutaneous leishmaniasis in the Amazon Region: isolation of Leishmania (Viannia lainsoni from the rodent Agouti paca (Rodentia: Dasyproctidae in Pará State, Brazil

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    Fernando T. Silveira

    1991-02-01

    Full Text Available Fez-se o registro, pela primeira vez, do isolamento de Leishmania (V. lainsoni de um mamífero silvestre, o roedor Agouti paca (Rodentia: Dasyproctidae, no Estado do Pará, Brasil. As amostras do parasita foram isoladas da pele, aparentemente íntegra, de 3 espécimes desse roedor, capturados no município de Tucuruí (ilha de Tocantins, em área que seria inundada pela formação do lago da hidrelétrica construída naquele município. Nenhum isolamento foi obtido de vísceras de qualquer dos animais. A identificação das amostras de L. (V. lainsoni baseou-se na morfologia de amastigotas e promastigotas, no comportamento da infecção em "hamsters", na análise bioquímica de isoenzimas e, ainda, através de testes com anticorpos monoclonais. A natureza inaparente da infecção nos animais faz supor que o mamífero em questão possa representar um hospedeiro definitivo do parasita na região Amazônica.The isolation of Leishmania (V. lainsoni is recorded for the first time from a wild animal, the rodent Agouti paca (Rodentia: Dasyproctidae, from Pará State, north Brazil. Isolates of the parasite were made from apparently normal skin of 3 specimens of this rodent captured on the Island of Tocantins, in the municipality of Tucuruí, an area subsequently flooded in the formation of the lake associated with the Tucuruí hydroeletric dam. No isolations were made from the viscera. Identification of the parasite was in each case based on morphology of the amastigotes and promastigotes, behavior of the organism in hamsters, isoenzymes profiles and the use of monoclonal antibodies. The inapparent nature of the infection leads us to suggest that the "paca", Agouti paca, represents a primitive host of L. (V. lainsoni in the Amazon Region.

  6. 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

  7. 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.

  8. 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

  9. 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.

  10. 与瓠瓜品系'J083'白粉病抗性基因连锁的SCAR分子标记%SCAR marker linked to resistance gene of powdery mildew in bottle gourd [Lagenaria siceraria (Molina) Standl.] breeding line J083

    Institute of Scientific and Technical Information of China (English)

    王玲平; 吴晓花; 汪宝根; 徐沛; 李国景

    2011-01-01

    The genetic analysis of bottle gourd [Lagenaria siceraria (Molina) Standl.] resistance to powdery mildew was evaluated with a highly resistant breeding line J083 and a highly susceptible breeding line J73 and their F1, F2 populations. The results showed that the resistance to powdery mildew in J083 was controlled by a single recessive gene. From 100 amplified fragment length polymorphism (AFLP) primer pair combinations, a pair of stable polymorphic AFLP markers (E-ATG/M-CTC), 105 bp in size was obtained. The AFLP fragment was then converted to a sequence-characterized amplified region (SCAR) marker, named as GPDSATG/CTC75. This SCAR marker could be used effectively for molecular markerassisted selection (MAS) in breeding programs to develop bottle gourd cultivars resistance to powdery mildew.%以瓠瓜抗白粉病品系'J083'和感病品系'J73'及它们的F1代和F2代分离群体为试验材料,经接种鉴定和抗性遗传规律分析表明:瓠瓜品系'J083'对白粉病的抗性受单隐性基因控制;从100对扩增片段长度多态性(AFLP)引物组合中获得稳定的多态性引物组合1对,即E-ATG/M-CTC;经回收、测序,特异片段全长为105 bp,并成功将其转化为序列特征性扩增区域(SCAR)标记;经连锁分析,该SCAR标记与白粉病抗性基因的连锁距离为9.6 cM,将其命名为GPDSATG/CTC75.此标记可用于瓠瓜抗白粉病品种的辅助选育.

  11. 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

  12. 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.

  13. A new karyotype of Calomys (Rodentia, Sigmodontinae)

    OpenAIRE

    Lima J. Fernando de S.; Kasahara Sanae

    2001-01-01

    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...

  14. Revision of the genus Castillomys (Muridae, Rodentia)

    NARCIS (Netherlands)

    Martín Suárez, E.; Mein, P.

    1991-01-01

    In this paper a revision of the genus Castillomys Michaux, 1969 is given. Previously described subspecies are elevated to species rank, and a new species, Castillomys rivas, is proposed. Several populations from Italy and Turkey are transferred to the genus Centralomys de Giuli, 1989. For a populati

  15. [Ectoparasites of small wild mammals from the adjacent areas of Itapecuru River and Environmental Preservation Area of Inhamum, state of Maranhão, Brazil].

    Science.gov (United States)

    Reis, Francineto S; Barros, Maria Claudene; Fraga, Elmary Da C; Da Penha, Tatiane A; Teixeira, Whaubytfran C; Dos Santos, Ana Clara G; Guerra, Rita De Maria S N De C

    2008-09-01

    During fauna studies, thirty-six wild mammals were collected in adjacent areas of Itapecuru River and Environmental Preservation area of Inhamum, state of Maranhão, Brazil. They were sampled for ectoparasites. The following specimens of the order Rodentia and its respective ectoparasites were identified: Akodon sp. (Androlaelaps sp. and Laelaps sp.), Oecomys sp. (Androlaelaps sp. and Amblyomma cajennense), Oligoryzomys sp. (Androlaelaps sp. Laelaps sp. and Amblyomma sp.) e Oryzomys megacephalus (A. cajennense). In Calomys callosus no ectoparasite was found. It was observed infestation in the order Didelphimorphia as follows: Didelphis marsupialis (Androlaelaps sp., Laelaps sp. and larvae of Diptera Cyclorrhapha); Gracilinanus sp. (Laelaps sp. and larvae of Diptera Cyclorrhapha), Monodelphis domestica (Poplygenis (Polygenis)), Cummingsia sp., Amblyomma sp. and Androlaelaps sp.). Marmosa sp. e Thylamis sp. had no ectoparasites. From the captured hosts 56% were infested, 82% and 44% rodents and marsupials, respectively. Mites from the family Laelapidae presented the great diversity of hosts and genus. PMID:20059819

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

    Directory of Open Access Journals (Sweden)

    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.

  17. Land fauna composition of small mammals of a fragment of Atlantic Forest in the State of Sao Paulo, Brazil

    Directory of Open Access Journals (Sweden)

    Darci Moraes Barros-Battesti

    2000-03-01

    Full Text Available The Atlantic Forest small mammal land fauna, except bats, and the abiotic factors that might have an influence on its composition, were studied in the Itapevi County, State of Sao Paulo, a forested region, partly altered by antropic action, from January, 1995 to June, 1996. The trapping effort consisted of 2,888 trap-nights, resulting in a 4.6% trapping success and consisted of monthly trappings, for five consecutive days. During this period, 134 specimens were captured, of which 46.3% were Didelphimorphia and 53.7% were Rodentia. Eleven species were registered: two Didelphimorphia: Didelphis marsupialis (Linnaeus, 1758 and Marmosops incanus (Lund, 1841, and nine Rodentia: Akodon cursor (Winge, 1887, Bolomys lasiurus (Lund, 1841, Oxymycterus hispidus Pictet, 1843, Oxymycterus nasutus (Waterhouse, 1837, Oligoryzomys nigripes (Olfers, 1818, Oryzomys angouya (Fischer, 1814, Raltus norvegicus (Berkenhout, 1769, Euryzygomatomys spinosus (G. Fischer, 1814 and Cavia aperea Erxleben, 1777. The relative density indices were correlated with meteorological data by Spearman and Pearson coefficients. For marsupials these correlations were not significant. For rodents, the correlations were significant and directly related to lower temperature and rainfall indices (p<0.05. During the dry season the occurrence of small mammals was 50% greater than during the wet season, probably due to foraging strategies in the studied fragment of Atlantic Forest.

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

    Directory of Open Access Journals (Sweden)

    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.

  19. [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).

  20. 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. PMID:11004549

  1. 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...

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

    Directory of Open Access Journals (Sweden)

    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

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

    DEFF Research Database (Denmark)

    Leirs, Herwig; Verheyen, Walter; Verhagen, Ron

    1996-01-01

    We investigated habitat preference, dispersal and movement patterns of Mastomys natalensis in fallow land and maize fields in Tanzania. During periods of low densities, the animals seemed to avoid open spaces and were concentrated in areas with rich vegetation cover. A high turn-over rate, even...... habitats and may have their burrow in any of them. Home ranges overlap both intra- and intersexually and there is no indication for territoriality. The obtained results are disappointing for the development of new pest control strategies....

  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. 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

    2016-06-01

    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. PMID:27276377

  6. 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).

  7. Dietary Ecology of Murinae (Muridae, Rodentia): A Geometric Morphometric Approach

    OpenAIRE

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

    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 base...

  8. 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.

  9. 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.

  10. [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.

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

    Directory of Open Access Journals (Sweden)

    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.

  12. 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.

  13. 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.

  14. Sobre a ocorrência de Callistomys pictus (Pictet (Rodentia, Echimyidae On the occurrence of Callistomys pictus (Pictet (Rodentia, Echimyidae

    Directory of Open Access Journals (Sweden)

    Sergio Maia Vaz

    2002-09-01

    Full Text Available A study on lhe geographical distribution of Callistomys pictus (Pictet, 1843 based on specimens conserved in museums, bibliography informations, and field observations is presented. The species is endemic to the Atlantic forest of the State of Bahia, Brazil. The destruction of the forests for pasture represents a serious threat to the survival of C. pictus and other species in southern Bahia.

  15. 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.

  16. 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.

  17. 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...

  18. 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

  19. 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

  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

    OpenAIRE

    Rafael Labarca Encina; Alfredo Prieto Iglesias

    2009-01-01

     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 regió...

  3. 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 

  4. 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

  5. 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.

  6. 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.

  7. 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.

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

    OpenAIRE

    MOIRA S. SOMBRA; ANTONIO M MANGIONE

    2005-01-01

    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 grea...

  9. 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

  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. 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

  12. 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.

  13. 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

  14. 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.

  15. 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.

  16. On the Mole-Rat (Cryptomys Hottentotus Damarensis (Rodentia in the Kalahari Gemsbok National Park

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    G de Graaff

    1972-01-01

    Full Text Available Aspects of the ecology and distribution of the Damara mole-rat (Cryptomys hottentotus damarensis are discussed relative to its life in the arid Kalahari Gemsbok National Park. The value of coat colour as a taxonomic criterion for the subspecies is discussed. Notes are also presented on reproduction, aspects of behaviour such as: habitat, nests, orientation, activity, locomotion, voice, food, feeding and social life, symbiosis, commensalism, parasites and predators.

  17. 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.

  18. Microsatellites indicate a high frequency of multiple paternity in Apodemus (Rodentia).

    Science.gov (United States)

    Baker, R J; Makova, K D; Chesser, R K

    1999-01-01

    Microsatellites were employed to estimate frequency of multiple paternity litters of two species of mice (genus Apodemus): striped field mouse (A. agrarius), and wood mouse (A. sylvaticus). Ten pregnant females of A. agrarius and six of A. sylvaticus were collected from natural populations in the northern Ukraine and analysed with 11 and nine microsatellite loci, respectively. Multiple paternity was indicated in eight of 10 litters in A. agrarius and in three of six litters in A. sylvaticus. Multiple paternity was documented at several loci (ranging from two to 10). In two cases (A. agrarius), three males were estimated to have fathered the litter. PMID:12187947

  19. 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.

  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. 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.

  2. 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.

  3. Reservoir competence of Microtus pennsylvanicus (Rodentia: Cricetidae) for the Lyme disease spirochete, Borrelia burgdorferi

    Science.gov (United States)

    Markowski, D.; Ginsberg, H.S.; Hyland, K.E.; Hu, R.

    1998-01-01

    The reservoir competence of the meadow vole, Microtus pennsylvanicus Ord, for the Lyme disease spirochete, Borrelia burgdorferi Johnson, Schmid, Hyde, Steigerwalt & Brenner was established on Patience Island, RI. Meadow voles were collected from 5 locations throughout Rhode Island. At 4 of the field sites, M. pennsylvanicus represented only 4.0% (n = 141) of the animals captured. However, on Patience Island, M. pennsylvanicus was the sole small mammal collected (n = 48). Of the larval Ixodes scapularis Say obtained from the meadow voles on Patience Island, 62% (n = 78) was infected with B. burgdorferi. Meadow voles from all 5 locations were successfully infected with B. burgdorferi in the laboratory and were capable of passing the infection to xenodiagnostic I. scapularis larvae for 9 wk. We concluded that M. pennsylvanicus was physiologically capable of maintaining B. burgdorferi infection. However, in locations where Peromyscus leucopus (Rafinesque) is abundant, the role of M. pennsylvanicus as a primary reservoir for B. burgdorferi was reduced.

  4. Biometric analysis and taxonomic allocation of Pleistocene Hystrix specimens (Rodentia, Porcupines) from China

    NARCIS (Netherlands)

    Weers, van D.J.; Shaohua, Zheng

    1998-01-01

    Early to Middle Pleistocene Hystrix material in the collections of the IVPP in Beijing, has been biometrically studied and compared with other fossil and extant species. The specimens are from Zhoukoudian (Beijing), the Liucheng Gigantopithecus cave (Guangxi) and other caves in that province, the Wa

  5. Mandible shape and dwarfism in squirrels (Mammalia, Rodentia): interaction of allometry and adaptation

    Science.gov (United States)

    Hautier, Lionel; Fabre, Pierre-Henri; Michaux, Jacques

    2009-06-01

    Squirrels include several independent lineages of dwarf forms distributed into two ecological groups: the dwarf tree and flying squirrels. The mandible of dwarf tree squirrels share a highly reduced coronoid process and a condylar process drawn backwards. Dwarf flying squirrels on the other hand, have an elongated coronoid process and a well-differentiated condylar process. To interpret such a difference, Elliptic Fourier Transform was used to evaluate how mandible shape varies with dwarfism in sciurids. The results obtained show that this clear-cut difference cannot be explained by a simple allometric relationship in relation with size decrease. We concluded that the retention of anteriorly positioned eye sockets, in relation with distance estimation, allowed the conservation of a well-differentiated coronoid process in all flying species, despite the trend towards its reduction observed among sciurids as their size decreases.

  6. Death of Boa constrictor amarali (serpentes, boidae) after ingestion of a tree porcupine (rodentia)

    OpenAIRE

    A. L. Cherubini; T. H. Barrella; R. J. DA SILVA

    2003-01-01

    The objective of this paper is to report the death of a Boa constrictor amarali after ingestion of a tree porcupine. The animal was donated to the Center for the Study of Venoms and Venomous Animals (CEVAP/UNESP) - and died in captivity. At necropsy, spine-like structures were observed in the stomach serosa and vicinity, and the stomach mucosa showed an intense reddish area, suggesting inflammation. The analysis of the spine-like structure revealed that they were tree porcupine spines. The fe...

  7. 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.

  8. 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.

  9. 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.

  10. 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.

  11. Genetic diversity and population structure of the Guinea pig (Cavia porcellus, Rodentia, Caviidae) in Colombia

    OpenAIRE

    William Burgos-Paz; Mario Cerón-Muñoz; Carlos Solarte-Portilla

    2011-01-01

    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 differen...

  12. 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.

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

    OpenAIRE

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

    2009-01-01

    Aunque inicialmente se pensaba que la testosterona inhibía el despliegue de conducta paterna en los machos de roedores, en algunas especies se ha demostrado que son necesarios niveles altos de testosterona para la exhibición de cuidados paternos. En cautiverio, los machos del ratón mexicano de los volcanes (Neotomodon alstoni), proporcionan a sus crías los mismos cuidados que la madre, con la excepción del amamantamiento. En este estudio se midieron los niveles plasmáticos de testosterona: en...

  14. 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.

  15. 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.

  16. 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.

  17. Ultrasonic vocalization and body temperature maintenance in infant voles of three species (Rodentia: Arvicolidae).

    Science.gov (United States)

    Blake, B H

    1992-12-01

    Infant voles thermoregulate poorly and produce ultrasonic vocalizations when cooled. Vocalizing and the ability to maintain body temperature in isolated pups cold-challenged at 5 degrees C or 22 degrees C were studied in nestling Clethrionomys glareolus, Microtus agrestis, and Arvicola terrestris. The tendency to vocalize varied with age, since pups vocalized more in their 2nd week than in their 1st or 3rd weeks. Rate of vocalizing was correlated with sound pressure level of vocalizations. Their was no apparent relation between vocalizing rate and deep body temperature. M. agrestis pups vocalized most and A. terrestris pups least, and all three species vocalized more at the lower temperature. Maximal vocalizing occurred in mid aged M. agrestis (at 5 degrees C) with mean of 1291 vocalizations/20 min and mean SPL of 80 dB (decibels re: 20 microN/m2). It is suggested that the vocalizing response is an adaptation related to risk from hypothermia in infant voles. PMID:1487083

  18. 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.

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

    Directory of Open Access Journals (Sweden)

    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.

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

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    Tremaine Gregory

    2015-06-01

    Full Text Available 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.

  2. 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.

  3. 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.

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

    OpenAIRE

    Tarcísio de Souza Duarte; Gisele Lessa

    2015-01-01

    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 ...

  5. Ecomorphological characterization of Murinae and hypsodont “Cricetidae” (Rodentia) from the Iberian Plio-Pleistocene

    OpenAIRE

    Hernández Fernández, M.; Peláez-Campomanes, Pablo

    2003-01-01

    [EN] In order to make inferences on the climatic range of extinct rodent genera, cluster analysis using dental morphological variables is performed. The goal of this study is to obtain rodent groupings which relate extinct an extant rodent genera on the basis of the ecomorphology of the dentition. The method is applied to two rodent groups, Murinae and hypsodont “Cricetidae” from the Iberian Plio- Pleistocene. The results show that dental morphology of the Plio-Pleistocene Murinae fr...

  6. Ecomorphological characterization of Murinae and hypsodont “Cricetidae” (Rodentia) from the Iberian Plio-Pleistocene

    OpenAIRE

    Hernández Fernández, Manuel; Peláez-Campomanes de Labra, Pablo

    2003-01-01

    In order to make inferences on the climatic range of extinct rodent genera, cluster analysis using dental morphological variables is performed. The goal of this study is to obtain rodent groupings which relate extinct an extant rodent genera on the basis of the ecomorphology of the dentition. The method is applied to two rodent groups, Murinae and hypsodont “Cricetidae” from the Iberian Plio- Pleistocene. The results show that dental morphology of the Plio-Pleistocene Murinae from the Iber...

  7. 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. PMID:26968578

  8. 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

    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...

  9. 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

  10. A new species of Calomys Waterhouse (Rodentia, Sigmodontinaefrom the Cerrado of Central Brazil

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    Cibele R. Bonvicino

    2003-06-01

    Full Text Available A new Brazilian Calomys Waterhouse, 1837 species is described based on morphologic and karyologic data. This species is endemic to the Cerrado of Central Brazil and allopatric with all other species of the genus Calomys. Its chromosome complement (2n = 46, AN = 66 is different from those described in other Calomys species. Morphometric analysis significantly distinguished this new species from other Calomys of the Brazilian fauna like C. callosus (Renger, 1830, C. expulsus (Lund, 1841 and C. tener (Winge, 1887 and placed it among the large-sized Calomys.

  11. G- and C-Banded Karyotype of Cricetulus migratorius Pallas, 1773 (Mammalia: Rodentia) in Central Anatolia

    OpenAIRE

    ARSLAN, Atilla; AKAN, Şükrüye

    2008-01-01

    The present study reports the banding patterns (G- and C-banding) of chromosomes of Cricetulus migratorius from Central Anatolia. Karyotype of C. migratorius comprised (2n) 22 chromosomes. The number of chromosomal arms (FN) was 44 and the number of autosomal arms (FNa) was 40. Subtelocentric X and Y chromosomes were very similar in size, but they differed on G- and C-banding patterns. Most autosomes in this species were C-negative. Pair no. 4 had very small centromeric C-bands, autosome no. ...

  12. Physiological damage in Algerian mouse Mus spretus (Rodentia, Muridae) exposed to crude oil

    OpenAIRE

    Flavio M.R. Da Silva Júnior; RITA I. MONARCA; DEODÁLIA DIAS; MARIA G. RAMALHINHO; MARIA L. MATHIAS; Ana L. Muccillo-Baisch

    2012-01-01

    Small mammals have been used to predict ecotoxicological damage caused by metals in field studies and laboratory exposure. In natural ecosystems, rodents play an important role either as seed dispersers or food providers for various predators since they represent intermediate links in the food chain. Several studies have already focused on the effects of metals on wild rodents, but data provided on the effects of organic contaminants, such as crude oil, are scarce. Among the possible biologic...

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

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    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.

  14. 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)

    OpenAIRE

    Beatriz Valcárcel-Yamani; Gerby Giovanna Rondán-Sanabria; Flavio Finardi-Filho

    2013-01-01

    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 oc...

  15. 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

    Directory of Open Access Journals (Sweden)

    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.

  16. Sedimentología de las unidades carbonáticas del Triásico en el sector Molina de Aragón-Albarracín

    OpenAIRE

    Pérez-Arlucea, Marta

    1987-01-01

    [ES] cinco unidades litoestratigráficas bien diferenciadas, que se distribuyen en dos barras de litología carbonática, separadas por un tramo terrígeno-evaporítico. Estos grandes tramos se disponen en "onlap", presentando una mayor extensión areal, las unidades superiores respecto de las inferiores. El límite de la primera barra carbonática se encuentra dentro de la zona estudiada. Sin embargo el tramo lutíticoevaporítico y la barra superior ocupan toda esta región, acuñándo...

  17. 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...

  18. Integrated Use of Biomarkers (O : N Ratio and Acetylcholinesterase Inhibition) on Aulacomya ater (Molina, 1782) (Bivalvia: Mytilidae) as a Criteria for Effects of Organophosphate Pesticide Exposition

    OpenAIRE

    Eduardo Führer; Anny Rudolph; Claudio Espinoza; Rodrigo Díaz; Marisol Gajardo; Nuria Camaño

    2012-01-01

    The effect of residual concentrations of organophosphate pesticide chlorpyrifos (Lorsban 4E) on the activity of the acetylcholinesterase enzyme and oxygen : nitrogen ratio in the mussel Aulacomya ater was analyzed. Toxicity tests show a sensitivity to the pesticide in the bivalve estimated at 16 μg L-1 (LC50-96 hours). Concentrations between 0.2 and 1.61 μg L-1 were able to inhibit significantly the AChE activity, and concentrations between 0.8 and 1.61 μg L-1 stimulate ammonia excretion and ...

  19. Integrated Use of Biomarkers (O : N Ratio and Acetylcholinesterase Inhibition) on Aulacomya ater (Molina, 1782) (Bivalvia: Mytilidae) as a Criteria for Effects of Organophosphate Pesticide Exposition.

    Science.gov (United States)

    Führer, Eduardo; Rudolph, Anny; Espinoza, Claudio; Díaz, Rodrigo; Gajardo, Marisol; Camaño, Nuria

    2012-01-01

    The effect of residual concentrations of organophosphate pesticide chlorpyrifos (Lorsban 4E) on the activity of the acetylcholinesterase enzyme and oxygen : nitrogen ratio in the mussel Aulacomya ater was analyzed. Toxicity tests show a sensitivity to the pesticide in the bivalve estimated at 16 μg L(-1) (LC(50-96 hours)). Concentrations between 0.2 and 1.61 μg L(-1) were able to inhibit significantly the AChE activity, and concentrations between 0.8 and 1.61 μg L(-1) stimulate ammonia excretion and decrease oxygen : ammonia-N (O : N) ratio, with respect to the control group. A. ater proved to be a species sensitive to pesticide exposure and easy to handle in lab conditions. Thus, it is recommended as a bioindicator for use in programs of environmental alertness in the Eastern South Pacific coastal zone. PMID:22619673

  20. Integrated Use of Biomarkers (O : N Ratio and Acetylcholinesterase Inhibition on Aulacomya ater (Molina, 1782 (Bivalvia: Mytilidae as a Criteria for Effects of Organophosphate Pesticide Exposition

    Directory of Open Access Journals (Sweden)

    Eduardo Führer

    2012-01-01

    Full Text Available The effect of residual concentrations of organophosphate pesticide chlorpyrifos (Lorsban 4E on the activity of the acetylcholinesterase enzyme and oxygen : nitrogen ratio in the mussel Aulacomya ater was analyzed. Toxicity tests show a sensitivity to the pesticide in the bivalve estimated at 16 μg L-1 (LC50-96 hours. Concentrations between 0.2 and 1.61 μg L-1 were able to inhibit significantly the AChE activity, and concentrations between 0.8 and 1.61 μg L-1 stimulate ammonia excretion and decrease oxygen : ammonia-N (O : N ratio, with respect to the control group. A. ater proved to be a species sensitive to pesticide exposure and easy to handle in lab conditions. Thus, it is recommended as a bioindicator for use in programs of environmental alertness in the Eastern South Pacific coastal zone.

  1. 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.

  2. 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.

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

    Directory of Open Access Journals (Sweden)

    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.

  4. 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

    Directory of Open Access Journals (Sweden)

    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.

  5. 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

  6. New species of Aspiculuris (Nematoda: Heteroxynematidae, parasite of Mus musculus (Rodentia: Muridae, from Hidalgo, Mexico Una nueva especie de Aspiculuris (Nematoda: Heteroxynematidae, parásito de Mus musculus (Rodentia: Muridae, de Hidalgo, México

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    Jorge Falcón-Ordaz

    2010-12-01

    Full Text Available Aspiculuris huascaensis n. sp. was found in the intestine of Mus musculus collected from 2 localities in Hidalgo, Mexico, and is described herein. The new species possesses cervical alae abruptly interrupted at mid-length of esophageal bulb form an acute angle, distinguishing it from 5 of the 17 species in the genus. The new species is differentiated from 11 of the remaining species by having cervical alae that form an acute angle and end at mid-length of the esophageal bulb. Aspiculuris huascaensis n. sp. most closely resembles A. tetraptera in the position of the terminal end of the cervical alae. However, the new species can be distinguished from that species by the number of caudal papillae (12 vs. 14, the presence of a sessile precloacal papilla between 2 cuticular folds, and by having a single pedunculate papilla located slightly posterior to the cloaca.Se describe una especie nueva, Aspiculuris huascaensis n. sp., proveniente del intestino de Mus musculus de 2 localidades de Hidalgo, México. Esta especie cuenta con 1 ala cervical interrumpida abruptamente formando un ángulo agudo; con base en este carácter, la especie nueva se distingue de 5 de las 17 especies que contiene el género. De 11 especies más, A. huascaensis n. sp. se diferencia por el ángulo agudo que forma el ala cervical y porque ésta finaliza a la mitad de la longitud del bulbo esofágico. Aspiculuris huascaensis n. sp. se asemeja a A. tetraptera por la terminación del ala cervical. Sin embargo, puede distinguirse de dicha especie por el número de papilas caudales (12 vs. 14, por la presencia de una papila precloacal sésil entre 2 pliegues cuticulares y por una papilla sencilla detrás de la cloaca.

  7. 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

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    CLAUDIO VELOSO

    2005-06-01

    Full Text Available 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 lactation: early (days 5-8, n = 12, middle (days 15-21, n = 7 and late (days 26-40, n = 6, and analyzed for protein, carbohydrates, lipids, ash, total solids and energy. On average, carbohydrates decreased from 3.1 ± 0.3 % (early to 1.1 ± 0.3 % (late during lactation; lipids, protein, ash, total solids and energy remained about the same. Lipids, the main component of the milk, were 17.3 % and protein remained near 4.4 %. Over lactation, total energy concentration of milk remained near 4.0 kJ mL-1. The maintenance of milk composition during lactation may be related to the initially high energetic and nutritional requirements associated with a precocial reproductive modeDurante la lactancia, tanto los requerimientos energéticos como nutricionales de las crías cambian gradualmente. Estos cambios normalmente van acompañados por modificaciones en la composición química de la leche. Se investigaron los cambios temporales de la composición de la leche durante la lactancia en el roedor caviomorfo precocial "degu" (Octodon degus bajo condiciones de laboratorio. Las hembras de degu fueron mantenidas en el laboratorio durante preñez y lactancia, y fueron alimentadas con alimento comercial de conejo. La leche fue colectada en tres estados de lactancia: temprana (días 5-8, n = 12, media (días 15-21, n = 7 y tardía (días 26-40, n = 6, y analizadas para proteínas, hidratos de carbono, lípidos, ceniza, sólidos totales y energía. En promedio, los hidratos de carbono disminuyen desde 3,1 ± 0,3 % (temprana hasta 1,1 ± 0,3 % (tardía durante la lactancia; mientras que, los lípidos, las proteínas, la ceniza, los sólidos totales y la energía se mantienen relativamente constantes. Los lípidos, el principal constituyente de la leche fue de 17,3 % y las proteínas correspondieron al 4,4 %. Durante la lactancia, la concentración de energía total de la leche permaneció cerca de los 4,0 kJ mL-1. La mantención de la composición de la leche durante la lactancia puede estar relacionada con los altos requerimientos energéticos y nutricionales asociados al modo reproductivo precocial

  8. 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.

  9. 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.

  10. 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

  11. Caamembecaia gratiosus n. gen., n. sp. (Acari: Trombiculidae), from Trinomys gratiosus (Gunter) (Rodentia: Echimydae), of Atlantic Forest in Southeastern Brazil

    OpenAIRE

    Gilberto S Gazêta; Marinete Amorim; David EP Bossi; Arício X Linhares; Nicolau M Serra-Freire

    2006-01-01

    From June 1999 to May 2001, small mammals were captured in three areas of the Atlantic Forest in Southeastern Brazil and examined for ectoparasites. Analysis of ectoparasites revealed the presence of a new chigger genus and species, Caamembecaia gratiosus, from Trinomys gratiosus. This is the first record of a chigger from T. gratiosus.

  12. Population dynamics of Euryoryzomys russatus and Oligoryzomys nigripes (Rodentia, Cricetidae) in an Atlantic forest area, Santa Catarina Island, Southern Brazil

    OpenAIRE

    Maurício Eduardo Graipel; Luiz Gustavo Rodrigues Oliveira-Santos; Marilena Altenfelder Arruda Campos; Pâmela Castro Antunes

    2009-01-01

    The population dynamics and reproductive issues of two species of rodents of the family Cricetidae, Rice Rats (Euryoryzomys russatus) and Pygmy Rice Rats (Oligoryzomys nigripes), were studied for 24 months in an Atlantic Forest area in southern Brazil. Euryoryzomys russatus presented density-dependent population fluctuation, and recruitment was positively associated with temperature. Oligoryzomys nigripes displayed the lowest abundance, greatest population fluctuation and shortest permanence ...

  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.

  14. 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.

  15. 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

    2016-01-01

    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. PMID:26897365

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

    OpenAIRE

    Calebe Pereira Mendes; José Flávio Cândido-Jr

    2014-01-01

    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 s...

  17. 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.

  18. 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.

  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. 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.

  1. Three dimensional geometric morphometric study of the Ethiopian Myomys - Stenocephalemys complex (Murinae, Rodentia

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    Carlo Fadda

    2000-06-01

    Full Text Available Abstract Geometric morphometrics was used to investigate the Ethiopian Myomys - Stenocephalemys complex, and to suggest possible explanations for differences in size and shape. The four species of the complex (M. albipes, M. ruppi, S. griseicauda, S. albocaudata and a Kenyan species, M. fumatus, were studied using Procrustes analysis of three dimensional landmarks collected over the skull. All these species occur in very different habitats, from forests at 1000 m up to the Afro Alpine moorlands above 4000 m. There is a substantial contradiction between phylogenetic relationships based on chromosomal rearrangements and allozymes (two distinct lineages corresponding to the two genera, and mtDNA (Stenocephalemys being paraphyletic. Geometric morphometrics supports the former hypothesis. Partial Least-Squares analysis shows a significant relation between variation in size and shape and altitude, which strongly suggests that adaptation is a major causal factor for divergence in the morphology of the skull. Size increases with altitude, paralleling a clinal change in shape, which involves stenocephaly as characterising the highland species. This shape modification allows the rodents to scan the sky efficiently for birds, which represent the main category of predators in the Afro Alpine moorlands.

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

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    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. Comparative chromosome banding of two South-American species of rice rats of the genus Oligoryzomys (Rodentia, Sigmodontinae).

    Science.gov (United States)

    Aniskin, V M; Volobouev, V T

    1999-01-01

    Comparative analysis of G- and C-banding patterns in two species of pygmy rice rats, namely Oligoryzomys microtis from Peru (Ucayali and Loreto departments) and O. flavescens from Bolivia (Tarija department) established that the diploid number of the former species is 64 (NFa = 66), whereas, in the latter, it varies between 64 and 66 (NFa = 66-68) due to the presence of 0-2 heterochromatic supernumerary or B chromosomes. The G-banding pattern of the euchromatic part of their karyotypes is similar in spite of differences in morphology of the largest and smallest autosomal pairs caused by a centromeric shift and the presence of heterochromatic arms, respectively. In addition, the total quantity of C-heterochromatin is smaller in the karyotype of O. microtis than in that of O. flavescens, resulting in differences in the number and size of chromosome pairs (including sex chromosomes) bearing C-blocks. It follows from present and previous data that these karyotypic features are stable in each of these species and thus may be used as species-specific markers.

  4. 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.

  5. 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.

  6. Geographic Variation in Skull Morphology of the Large Japanese Field Mice, Apodemus speciosus (Rodentia: Muridae) Revealed by Geometric Morphometric Analysis.

    Science.gov (United States)

    Shintaku, Yuta; Motokawa, Masaharu

    2016-04-01

    We analyzed geographic variation in skull morphology of the large Japanese field mouse (Apodemus speciosus) and determined changes in skull morphology that occurred during the evolutionary history of A. speciosus in relation to the estimated distribution range in the last glacial maximum (LGM). We analyzed 1,416 specimens from 78 localities using geometric morphometric techniques applied to the dorsal side of the cranium and mandible. While large variations within and among the populations in Honshu, Shikoku, and Kyushu were observed, geographic patterns were not observed. Hokkaido and peripheral island populations showed shared differentiation from the Honshu, Shikoku, and Kyushu populations with a larger skull and distinct mandible shape. In addition, these two groups also differed from each other in accumulated random shape variation. Common characteristics found in Hokkaido and peripheral island populations were considered to be the ancestral states, which were retained by geographic isolation from the main islands. Random variations in Hokkaido and the peripheral island populations were formed through stochastic processes in relation to their isolation. Characteristic morphologies widely found in the populations of Honshu, Shikoku, and Kyushu were considered to be derived states that expanded after separation from the peripheral islands. Complex geomorphology and a shift in distribution range related to climate change and altitudinal distribution are suggested to have formed the complex geographic variation in this species. PMID:27032678

  7. 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.

  8. 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.

  9. 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].

  10. 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...... is seasonal. All individuals whose stomachs were analyzed ate a wide range of items, indicating omnivory in this species at this site; however, seeds were the most preferred diet category, with a mean contribution of 50.4%, followed by arthropods, with a mean contribution of 25.7%. Other plant materials...

  11. Pseudoescorpiones (Arachnida: Pseudoscorpionida) asociados a nidos de ratas del género Neotoma (Mammalia: Rodentia) del Altiplano Mexicano

    OpenAIRE

    G. A. Villegas Guzmán; T. M. Pérez

    2005-01-01

    Se registran 153 ejemplares de once especies de pseudoescorpiones encontradas en 32 nidos de cinco especies del género Neotoma del Altiplano Mexicano. En los nidos de N. albigula se encontró a Tychochernesinflatus, Lustrochernes grossus, Serianus dolosus y Juxtachelifer fructuosus; en los de N. goldmani a T. inflatus;en los de N. micropus a Pachychernes sp. y Chelifer cancroides; en los de N. mexicana a Paraliochthonius sp.,Larca chamberlini, S. dolosus, Illinichernes distinctus y T. inflatus...

  12. Convergent evolution of aquatic foraging in a new genus and species (Rodentia: Muridae) from Sulawesi Island, Indonesia.

    Science.gov (United States)

    Rowe, Kevin C; Achmadi, Anang S; Esselstyn, Jacob A

    2014-01-01

    The island of Sulawesi, in Indonesia, lies at the crossroads of the Indo-Australian Archipelago and has remained isolated from the Asian (Sunda) and Australian (Sahul) continental shelves for at least the last 10 million years. Of the 50 native species of rodents on Sulawesi, all are endemic and represent the evolution of a variety of ecological and morphological forms within the Muridae and Sciuridae. Carnivorous rodents have evolved, perhaps independently, in Muridae from the Philippines, Sulawesi, and Sahul, but semi-aquatic murids are only known from Sahul. Here we describe a new genus and species of insectivorous water rat from Sulawesi. Phylogenetic analyses demonstrate that it is related to the shrew rats of Sulawesi and represents an origin of aquatic carnivory that is independent from the evolution of water rats on Sahul. Many areas of Sulawesi have not been surveyed systematically and current lists of mammal species are likely to dramatically underestimate actual diversity. PMID:24943633

  13. 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.

  14. 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. PMID:27522370

  15. 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.

  16. 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. PMID:26865230

  17. 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. PMID:25911036

  18. Population dynamics and bioenergetics of a fossorial herbivore, Thomomys talpoides (Rodentia: Geomyidae), in a spruce-fir sere

    Science.gov (United States)

    Andersen, Douglas C.; MacMahon, James A.

    1981-01-01

    Studies of the bioenergetics of the northern pocket gopher, Thomomys talpoides, are coupled with data on demography, activity budgets, and microclimates to model the energy requirements of individuals and populations in the Wasatch Mountains of Utah during 1976-1979. Metabolic rates during rest increased linearly with decreasing ambient temperature, but burrowing metabolic rates (16.3 mL O2 • h-1 • g-9.75) were independent of both temperature and physical properties of the soil. Radio-telemetry studies indicated that free-ranging gophers are active =50% of each day. Conservative estimates of true energy consumption were calculated using estimates of habitat-specific minimum daily burrowing requirements. Rates of burrowing measured in the laboratory were either ∞ 0.0 or ∞ 2.0 cm/min. The low burrowing rate was observed when the soil was frozen or saturated with water, as would occur in the field in early winter and in spring, respectively. Gophers burrowed through soil at the study site at an average rate of ∞ 1.5 cm/min. Belowground food energy densities at gopher foraging depth declined from 24.6 to 3.2 J/cm3 along a successional gradient (subalpine forb meadow to Engelmann spruce dominated forest). We conclude that individual gophers are food limited within the climax spruce seral stage. Further, daily energy costs associated with reproduction in females may exceed the belowground energy supply available in intermediate seral stages (aspen and subalpine fir). Reduction of burrowing rates for any reason will affect gophers in the late seral stages proportionately more than those resident in the meadow. The peak gopher densities recorded (from 62 individuals/ha in the meadow to 2 individuals/ha in spruce forest) support these inferences. Detailed demographic information was obtained only in the meadow seral stage. Adult survivorship was lower in winter than in summer and varied greatly between years (0.18-0.70 yr-1). Juvenile survivorship from weaning through the first year was comparable to adult annual rates. The fertility rate was 3.75 young • female-1 • yr-1. The energy supply and demand analyses indicate that the growth of Thomomys talpoides populations in the early seral stages is seldom directly limited by the amount of food present. From our demographic, environmental, and autecological studies we conclude that stochastic events associated with weather affect energy acquisition (burrowing) rates, and thus survivorship. In montane environments, such events may prevent populations from attaining sizes at which territorial behavior would hypothetically limit further increases. The energy flow through the meadow population at moderate to high )1976-1977) densities (at least 1100 MJ • ha-1 • yr-1) indicates that pocket gophers are proficient energy movers relative to non-fossorial small mammals. Subalpine T. talpoides populations appear commonly to attain such densities. More than 30% of the annual primary productivity allocated to belowground parts of meadow forbs may be consumed by gophers.

  19. 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.

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

    Directory of Open Access Journals (Sweden)

    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.

  1. The relationship of sex and ectoparasite infestation in the water rat Scapteromys aquaticus (Rodentia: Cricetidae) in La Plata, Argentina.

    Science.gov (United States)

    Lareschi, Marcela

    2006-06-01

    I studied the relationship between sex and infestation with ectoparasites in the water rat Scapteromys aquaticus from La Plata river marshland, Argentina. The Relative Density's Index (RDI) for males was 3.90% (females 3.60%). A total of 2653 ectoparasites were collected on 33 male hosts, and 1945 on 31 females. Ectoparasite specific richness (S) and diversity (H) were S = 14, H = 1.17 on males, and S = 10, H = 1.52 on females. The similarity between male and female rodents according to their ectoparasites was 75.00%. Although no ectoparasite species showed significant mean abundance (MA) differences between host sexes (p hosts (N = 2.01, p ectoparasite burden and specific richness. This information has epidemiological potential because the closely related Scapteromys tumidus is involved in the transmission of Rickettsia coronii, which causes Marsella fever in humans. PMID:18494333

  2. 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.

  3. 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. PMID:27193170

  4. A Study on the Distribution, Morphology and Karyology of Tatera indica (Hardwicke, 1807) (Mammalia: Rodentia) in Turkey

    OpenAIRE

    YİĞİT, Nuri; ÇOLAK, Ercüment; VERİMLİ, Reyhan

    2001-01-01

    The Habitat, external and cranial morphologies, and karyotype of Turkish specimens of Tatera indica are described for the first time with this study. It was determined that Tatera indica was located in uncultivated arid and semi-arid habitat in southeastern Turkey. Its external and cranial characteristics are consistent with those detailed in published papers. The karyotype of Tatera indica is composed of 2n = 68, NF = 84 and NFa = 80.

  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. Chromosome synapsis and recombination in simple and complex chromosomal heterozygotes of tuco-tuco (Ctenomys talarum: Rodentia: Ctenomyidae).

    Science.gov (United States)

    Basheva, Ekaterina A; Torgasheva, Anna A; Gomez Fernandez, Maria Jimena; Boston, Emma; Mirol, Patricia; Borodin, Pavel M

    2014-09-01

    The chromosomal speciation hypothesis suggests that irregularities in synapsis, recombination, and segregation in heterozygotes for chromosome rearrangements may restrict gene flow between karyotypically distinct populations and promote speciation. Ctenomys talarum is a South American subterranean rodent inhabiting the coastal regions of Argentina, whose populations polymorphic for Robertsonian and tandem translocations seem to have a very restricted gene flow. To test if chromosomal differences are involved in isolation among its populations, we examined chromosome pairing, recombination, and meiotic silencing of unsynapsed chromatin in male meiosis of simple and complex translocation heterozygotes using immunolocalization of the MLH1 marking mature recombination nodules and phosphorylated histone γH2A.X marking unrepaired double-strand breaks. We observed small asynaptic areas labeled by γH2A.X in pericentromeric regions of the chromosomes involved in the trivalents and quadrivalents. We also observed a decrease of recombination frequency and a distalization of the crossover distribution in the heterozygotes and metacentric homozygotes compared to acrocentric homozygotes. We suggest that the asynapsis of the pericentromeric regions are unlikely to induce germ cell death and decrease fertility of the heterozygotes; however, suppressed recombination in pericentromeric areas of the multivalents may reduce gene flow between chromosomally different populations of the Talas tuco-tuco. PMID:24924853

  7. 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.

  8. 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.

  9. 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.

  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. El Triásico de la región Nuevalos-Cubel (Zaragoza). Sedimentación en un sector del borde de cuenca del surco Molina-Valencia.

    OpenAIRE

    García Royo, J.F.C.; Arche, Alfredo

    1987-01-01

    El Triásico de la región Nuévalos-Cubel (Zaragoza) se depositó en el flanco SO del Umbral de Ateca, límite de la Cuenca Ibérica durante la mayor parte de este período. La sedimentación, controlada por falías de dirección NO-SE, comenzó al O por abanicos aluviales retrogradantes, seguidos de ríos meandriformes, diversos complejos costeros siliciclásticos y al comienzo de la sedimentación de las facies Muschelkalk> el Umbral queda totalmente cubierto por sedimentos. Se hace...

  12. El Triásico de la región Nuévalos - Cubel (Zaragoza). Sedimentación en un sector de cuenca del surco Molina-Valencia.

    OpenAIRE

    Arche, A.; García-Royo, J. F. C.

    1987-01-01

    [ES] El Triásico de la región Nuévalos-Cubel (Zaragoza) se depositó en el flanco SO del Umbral de Ateca, límite de la Cuenca Ibérica durante la mayor parte de este período. La sedimentación, controlada por falías de dirección NO-SE, comenzó al O por abanicos aluviales retrogradantes, seguidos de ríos meandriformes, diversos complejos costeros siliciclásticos y al comienzo de la sedimentación de las facies Muschelkalk> el Umbral queda totalmente cubierto por sedimentos. Se ...

  13. 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...

  14. 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.

  15. Infecção experimental de Calomys callosus (Rengger, 1830), (Cricetidae - Rodentia) a quatro espécies de parasitos

    OpenAIRE

    1980-01-01

    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 pode...

  16. 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.

  17. 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.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.

  18. 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

  19. 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...

  20. 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.

  1. Note on breeding and parental care behaviours of albino Hoary-bellied Squirrel Callosciurus pygerythrus (Rodentia: Sciuridae in Sibsagar District of Assam, India

    Directory of Open Access Journals (Sweden)

    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.

  2. 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.

  3. Ciclo Vital de Schistosoma mansoni através do Holochilus brasiliensis (Desmarest, 1818 em ambiente semi-natural (Trematoda, Shistosomatidae; Rodentia, Cricetidae

    Directory of Open Access Journals (Sweden)

    Omar dos Santos Carvalho

    1976-10-01

    Full Text Available Junto ao Lago da Pampulha, Belo Horizonte, MG, foram capturados (julho/72-novembro/73 28 exemplares de Holochilus brasiliensis, dos quais 11 (39,3% eliminavam nas fezes ovos viáveis de S. mansoni. Miracídios da cepa mencionada ("H" infectaram Biomphalaria glabrata e as cercárias obtidas também infectaram camundongos albinos, recuperando-se, ao final do experimento, 35,3% de vermes adultos. Por outro lado, cercárias de cepa humana ("LE" de S. mansoni infectaram sete exemplares de H. brasiliensis, nascidos em laboratório, recuperando-se no fim de 60 dias, 30,5% de vermes adultos. Estudos anatomapatológicos de H. brasiliensis demonstraram infecção generalizada, encontrando-se granuloma no esôfago, estômago, intestino (delgado e grosso, fígado, baço, pâncreas e linfonodos abdominais. Espessamentos fibrosos da íntima da veia porta, granulomas em espaços porta e fibrose incipiente dos espaços porta e interlobular foram lesões decorrentes da presença de ovos de S. mansoni encontrados no fígado. Em ambiente semi-natural, foi possível fechar o ciclo do S. mansoni sem direta participação humana, utilizando-se B. glabrata experimentalmente infectadas com trematódeos da cepa "LE", H. brasiliensis nascidos em laboratório e B. glabrata nascida no ambiente semi-natural estabelecido. Verificou-se que ambas as cepas ("H" e "LE" comportaram-se de maneira análoga, não sendo verificadas, também, diferenças morfológicas entre os ovos e vermes adultos de ambas. As observações, realizadas no campo e no laboratório demonstraram que o Holochilus brasiliensis é bom hospedeiro de Schistosoma mansoni. Assim, em determinadas áreas e sob certas condições ecológicas, o cricetídeo em questão poderá, efetivamente, integrar-se ao ciclo do trematódeo na natureza, independente ou paralelamente à presença do homem. Assinala-se, finalmente, que o presente trabalho relata o segundo fechamento do ciclo biológico de S. mansoni em condições ditas semi-naturais. Os primeiros estudos, entretanto, de Antunes, Milward de Andrade, Katz & Coelho4,,em 1971 e de Antunes5, em 1971 foram feitos utilizando-se o Nectomys s. squamipes.

  4. 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.

  5. 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

    Directory of Open Access Journals (Sweden)

    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.

  6. 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.

  7. 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.

  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. PMID:27353005

  9. Panic-like defensive behavior but not fear-induced antinociception is differently organized by dorsomedial and posterior hypothalamic nuclei of Rattus norvegicus (Rodentia, Muridae

    Directory of Open Access Journals (Sweden)

    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.

  10. 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

  11. 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. PMID:26335466

  12. 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. PMID:25962464

  13. 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

    The influence of avian predation on population size and local survival of Mastomys natalensis rats in Tanzania was studied in a capture-recapture study over a six month period on experimental fields with decreased, controlled and increased predation pressure. Bird observations indicated...... 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....

  14. UN ÍNDICE PARA LA EVALUACIÓN DEL HÁBITAT DE AGOUTI TACZANOWSK/1 (RODENTIA: AGOUTIDAE) EN ÁREAS DE BOSQUE ANDINO NUBLADO

    OpenAIRE

    Jairo Pérez-Torres

    2002-01-01

    Se presenta un índice que permitirá evaluar el hábitat de la "Lapa andiim" o "Tinajo" (Agouti taczanowskii) en zonas de bosque andino nublado. El objetivo fundamental de este índice, es obtener elementos que sirvan para la toma de decisiones en cuanto al diseño de áreas de reserva y planes de manejo sobre esta especie. Este índice se basa en la aplicación de criterios tanto cualitativos como cuantitativos, los cuales son tabulados y computados para sacar un valor de calidad de hábitat para ca...

  15. 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.

  16. Lineage-specific responses of tooth shape in murine rodents (murinae, rodentia to late Miocene dietary change in the Siwaliks of Pakistan.

    Directory of Open Access Journals (Sweden)

    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.

  17. Ciclo Vital de Schistosoma mansoni através do Holochilus brasiliensis (Desmarest, 1818 em ambiente semi-natural (Trematoda, Shistosomatidae; Rodentia, Cricetidae

    Directory of Open Access Journals (Sweden)

    Omar dos Santos Carvalho

    1976-10-01

    Full Text Available Junto ao Lago da Pampulha, Belo Horizonte, MG, foram capturados (julho/72-novembro/73 28 exemplares de Holochilus brasiliensis, dos quais 11 (39,3% eliminavam nas fezes ovos viáveis de S. mansoni. Miracídios da cepa mencionada ("H" infectaram Biomphalaria glabrata e as cercárias obtidas também infectaram camundongos albinos, recuperando-se, ao final do experimento, 35,3% de vermes adultos. Por outro lado, cercárias de cepa humana ("LE" de S. mansoni infectaram sete exemplares de H. brasiliensis, nascidos em laboratório, recuperando-se no fim de 60 dias, 30,5% de vermes adultos. Estudos anatomapatológicos de H. brasiliensis demonstraram infecção generalizada, encontrando-se granuloma no esôfago, estômago, intestino (delgado e grosso, fígado, baço, pâncreas e linfonodos abdominais. Espessamentos fibrosos da íntima da veia porta, granulomas em espaços porta e fibrose incipiente dos espaços porta e interlobular foram lesões decorrentes da presença de ovos de S. mansoni encontrados no fígado. Em ambiente semi-natural, foi possível fechar o ciclo do S. mansoni sem direta participação humana, utilizando-se B. glabrata experimentalmente infectadas com trematódeos da cepa "LE", H. brasiliensis nascidos em laboratório e B. glabrata nascida no ambiente semi-natural estabelecido. Verificou-se que ambas as cepas ("H" e "LE" comportaram-se de maneira análoga, não sendo verificadas, também, diferenças morfológicas entre os ovos e vermes adultos de ambas. As observações, realizadas no campo e no laboratório demonstraram que o Holochilus brasiliensis é bom hospedeiro de Schistosoma mansoni. Assim, em determinadas áreas e sob certas condições ecológicas, o cricetídeo em questão poderá, efetivamente, integrar-se ao ciclo do trematódeo na natureza, independente ou paralelamente à presença do homem. Assinala-se, finalmente, que o presente trabalho relata o segundo fechamento do ciclo biológico de S. mansoni em condições ditas semi-naturais. Os primeiros estudos, entretanto, de Antunes, Milward de Andrade, Katz & Coelho4,,em 1971 e de Antunes5, em 1971 foram feitos utilizando-se o Nectomys s. squamipes.Close to the Pampulha Lake, Belo Horizonte, MG (Brazil, there were collected (july/72 -November/73 28 specimens of Holochilus brasiliensis, 11 of them (39.3% eliminating S. mansoni viable eggs in their faeces. Miracidia from the strain above ("H" could infected Biomphalaria glabrata, the cercariae shed later being also able to infect albino mice, from whose faeces 35,3% of adult worms were recovered in the end of the experiment. S. mansoni cercariae from human strain ("LE" infected 7 H. brasiliensis laboratory specimens, and 30,5% of adult worms could be recovered in the end of 60 days. Anatomopathological studies of H. brasiliensis demonstrated generalized infection, granulomes being detected in the esophagus, stomach, intestines (small and large, tiver, spleen, pancreas and abdominal lymphnodes. Fibrous thickenning of the portal vein intima, granulomes in portal spaces an incipient fibrosis of portal and interlobular spaces were the lesion triggered by the presence of S. mansoni eggs in the liver. In semi-natural surroundings (Fig. 1, the life cycle of S. mansoni could be completed, with no human interference, by using B. glabrata experimentally infected with trematodes from "LE" strain, laboratory-bred H. brasiliensis and B. glabrata specimens from hat seminatural surroundings. It was observed that both strains ("H" and "LE" displayed similar behaviour, no morphological differences having been detected between their eggs and adult worms. Field and laboratory studies demonstrated Holochilus brasiliensis to be a satisfactory intermediate host of S. mansoni. It is than possible that, under certains ecological conditions, the cricetids under study may eventually be integrated in the trematode natural cycle, independently from or parallely the presence of man. It must finally be pointed out that the present paper reports the second case of lifecycle completion under semi-natural conditions. The former studies4,5, however, were conducted on Nectomys s. squamipes.

  18. Trichospirura aethiopica n. sp. (Nematoda: Rhabdochonidae from Malacomys longipes (Rodentia: Muridae in Gabon, first record of the genus in the Ethiopian Realm

    Directory of Open Access Journals (Sweden)

    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.

  19. Karyotypes of Three Rat Species (Mammalia: Rodentia: Muridae) from Hainan Island, China, and the Valid Specific Status of Niviventer lotipes 

    OpenAIRE

    Li, Yuchun; Wu, Yi; Harada, Masashi; Lin, Liang-Kong; MOTOKAWA, Masaharu

    2008-01-01

    The karyotypes of three rat species from Hainan Island, China, were examined. Niviventer fulvescens (Gray, 1847) had 2n=46 and FN=64, similar to the karyotypes reported for N. fulvescensfrom Southeast Asia, while Niviventer lotipes (Allen, 1926) had 2n=52 and FN=66, which is distinct from the known karyotypes of other Niviventer species. Niviventer lotipes was recently considered conspecific with N. tenaster (Thomas, 1916), but the two were found to have extremely different karyotypes (2n=52 ...

  20. Biochemical Changes of the Organism of Apodemus flavicollis (Rodentia: Muridae Under Conditions of Environmental Anthropogenic Pollution by Heavy Metals in Northern Areas of Ukraine

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    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.

  1. NEW OLIGOCENE SCIURIDS AND APLODONTIDS (RODENTIA, MAMMALIA) FROM MONGOLIA%蒙古新发现的渐新世山河狸和松鼠类化石

    Institute of Scientific and Technical Information of China (English)

    王伴月; D.达什泽维格

    2005-01-01

    A new species of Kherem, K. asiatica, and three new forms of Prosciurus ( P. mongoliensis sp. nov., P. cf. P. mongoliensis and P. pisinnus sp. nov. ) from Oligocene of Mongolia are described here.Kherem asiatica, known from Shand Member (late early Oligocene -? late Oligocene) of Mongolia,is characterized by: cheek teeth larger and wider than those of K. hsandgoliensis; m1 ~ 3 with subequally high metaconid and large hypoconid, with more distinct entolophid and entoconid separated from posterolophid by shallow groove.Kherem is referred to the North American subfamily Cedromurinae. It might be derived from an Oligospermophilus-like form. The three genera so far described from Asia (Sciurus, Oligosciurus and Kherem) may represent three different lineages, indicating the Oligocene diversity of the sciurids in Asia.Prosciurus mongoliensis is known from Shand and Tatal Members of the Hsanda Gol Formation,Oligocene, in Mongolia. Its main features are: brachydont cheek teeth have mesostylid connected with metastylid crest, weak mesoconid, and weak or no ectomesolophid; anteroconid and anterior cingulum are absent on p4; an accessory crest extends from ectolophid to hypolophid on m1; metalophid Ⅱ is well developed on m2 ~ 3; hypolophid bends posteriorly to join with posterolophid on p4 ~ m1, but straight to join with ectolophid on m2 ~ 3. Prosciurus cf. P. mongoliensis from Shand Member is different from P.mongoliensis in having smaller cheek teeth in size, p4 having distinct ectomesolophid, p4 and m1 having gently curved hypolophid, m1 lacking accessory crest from ectolophid to hypolophid, and m2 ~ 3 having shorter metalophid Ⅱ. Prosciurus pisinnus, collected from Tatal Member, is small in size. Its cheek teeth are brachydont with distinct cingulum. The metalophid Ⅱ is short, and the hypolophid is transverse, low,and joins with ectolophid. The mesoconid and ectomesolophid are well developed, and the hypoconid extends more anterobuccally. The protoconid of p4 has more developed anterior arm.The new material of the Mongolian Aplodontidae not only has confirmed the early existence of Prosciurus in Asia, but also shows that Prosciurus experienced considerable diversity during the Oligocene in Asia.Both the sciurids and aplodontids found from Oligocene of Asia have closer relationships with those of North America than with Europe.%蒙古中部地区的三达河组(Hsanda Gol Formation)是亚洲渐新世陆相地层的经典地层之一.三达河组的沉积岩层现被分成两个岩性段:上部早渐新世晚期-?晚渐新世山地段(Shand Member)和下部早渐新世早期塔塔尔段(Tatal Member);两岩段间有时夹有Khar Khoroo玄武岩层(Bryant and McKenna,1995;Meng and McKenna,1998).该玄武岩层的时代用40Ar/39Ar法被确定为距今31.5 Ma(Hock et al.,1999,他们称其为Basalt Ⅰ).三达河组中产有丰富的哺乳动物化石,特别是啮齿类化石(Matthew and Granger,1923;Kowalski,1974;Russelland Zhai,1987;Hock et al.,1999).近年来,本文的后一作者在三达河组中又采集到一批啮齿类化石,其中包括松鼠和山河狸2科的化石.本文是对这两类化石新材料的记述.现生的松鼠科分异很大,而且大多数都分布在亚洲.然而,松鼠科化石在古近纪时在北美和欧洲却很丰富.在北美出现于晚始新世,在渐新世时已明显分异;在欧洲出现于早渐新世,在中新世时分异很大.相反,亚洲古近纪的松鼠化石却发现得很少,标本也很破碎.已报道的只有3件标本.2件产自党河下游地区:Bohlin(1946)报道的晚渐新世的Sciurus sp.,标本只是2枚单个臼齿(M3和m2);王伴月、邱占祥(2004)报道的早渐新世的党河鲜松鼠(Oligo-sciurus dangheensis),标本只是一段带m1~2的下颌骨.还有一件是Minin(2004)报道的蒙古渐新世的三达河克热姆鼠(Kherem hsandgoliensis),标本也只是一段带m1~3的下颌骨.本文报道的松鼠化石产自蒙古国的巴彦洪戈尔省的塔石盖贝(Tashgain Bel)地点的三达河组上部山地段,时代为早渐新世晚期-?晚渐新世.这批松鼠化石标本包括1件具P3~M3的上颌骨(PC 36-9)和2段下颌骨(PC 36-10和PC 36-11).这是亚洲古近纪目前已知的最好的一批松鼠化石标本,代表松鼠科Kherem属的一新种:亚洲克热姆鼠(Kherem asiatica sp.nov.).其主要特征是颊齿较大,较宽;下内尖的高度和下次尖的大小从m1到m3变化不大,彼此相近;下内脊较明显;下内尖较明显,与下后边脊间有浅沟分开等.K.asiatica的形态特征表明,Kherem属应归入北美的Cedromurinae亚科.新的发现表明,亚洲渐新世的松鼠已发生了分异,至少可分为3支.以Kherem为代表的一支,与北美早期的cedromurines有较近的系统关系.它可能是由类似于北美Oligospermophilus的种类演化并迁徙到亚洲来的.现生的山河狸只有一种(Aplodontia rufa),仅生活在北美西部沿海地区.但从始新世到中新世,山河狸却遍布全北区.它们在北美较繁盛,分异大,但在亚洲发现得很少.在亚洲渐新世地层中虽曾报道过3属4种山河狸化石,但材料都很少(Prosciurus ordosicus和P.?shantun-gensis均只有一枚单个的牙).山河狸化石在蒙古渐新世地层的新发现表明,亚洲渐新世的山河狸化石比已知的要丰富.本文描述的山河狸化石分别采自蒙古南戈壁省Shunkt地点的山地段和前杭爱省UlaanKhongil(=Tatal Gol)地点的塔塔尔段.它们代表原松鼠属的3类:蒙古原松鼠(新种)(Prosci-urus mongoliensis sp.nov.)、蒙古原松鼠(相似种)(P.cf.P.mongoliensis)和小原松鼠(新种)(P.pisinnus sp.nov.).蒙古原松鼠的主要特征是下颊齿的下中附尖与下后附尖脊连,下中尖发育较弱,下外中脊弱或无;p4无下前边尖和下前齿带;ml具从下外脊伸向下次脊的小刺;m2和m3的下后脊Ⅱ较发育;下次脊在p4和m1后弯,与下后边脊连,在m2和m3横向,伸达下外脊等.蒙古原松鼠(相似种)与蒙古原松鼠的区别是:颊齿尺寸较小,p4具明显的下外中脊,p4和m1的下次脊弯曲度较缓,m1缺从下外脊伸向下次脊的小刺,m2~3的下后脊Ⅱ较短等.小原松鼠的主要特征是:个体较小;齿冠较低;下臼齿的下中附尖孤立;下颊齿的下次脊横向、较低,与下外脊连,下中尖和下外中脊均较明显,下次尖明显向前颊侧延伸,具明显的齿带等.蒙古渐新世啮齿类化石的新发现表明,亚洲渐新世的松鼠和山河狸与北美的关系要比与欧洲的近.

  2. 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

  3. 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

    OpenAIRE

    PETRA K WALLEM; Jones, Clive G; Marquet, Pablo A.; Fabián M. Jaksic

    2007-01-01

    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 H...

  4. 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

    Directory of Open Access Journals (Sweden)

    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

  5. 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

  6. 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.

  7. 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

    OpenAIRE

    Marcela Lareschi

    2004-01-01

    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 de...

  8. 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.

  9. 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.

  10. 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

  11. Pathogenic Hantaviruses, Northeastern Argentina and Eastern Paraguay

    OpenAIRE

    Padula, Paula; Martinez, Valeria P.; Bellomo, Carla; Maidana, Silvina; San Juan, Jorge; Tagliaferri, Paulina; Bargardi, Severino; Vazquez, Cynthia; Colucci, Norma; Estévez, Julio; Almiron, María

    2007-01-01

    We describe the first, to our knowledge, cases of hantavirus pulmonary syndrome in northeastern Argentina and eastern Paraguay. Andes and Juquitiba (JUQ) viruses were characterized. JUQV was also confirmed in 5 Oligoryzomys nigripes reservoir species from Misiones. A novel Akodon-borne genetic hantavirus lineage was detected in 1 rodent from the Biologic Reserve of Limoy.

  12. 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

    Directory of Open Access Journals (Sweden)

    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...

  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. 中国大陆白腹鼠属的分支系统发育研究%STUDIES ON CLADISTIC PHYLOGENY OF GENUS NIVIVENTER (RODENTIA,MURIDAE) IN MAINLAND OF CHINA

    Institute of Scientific and Technical Information of China (English)

    邓先余; 冯庆; 王应祥

    2005-01-01

    运用Hennig的分支系统学原理和方法,对分布于中国大陆的白腹鼠属7个种的部分外部及头骨形态学特征进行性状数据分析,结合应用Paup和Hennig 86两种分支系统学软件对它们之间的系统发育关系进行研究.结果表明:安氏白腹鼠N.andersoni和川西白腹鼠N.excelsior亲缘关系较近,二者聚在一起,组成了Musser(1981)的安氏白腹鼠种组N.andersoni-Division;另外刺毛鼠N.fulvescens和褐尾鼠N.cremoriuenter的亲缘关系最近,二者先聚在一起,再与社鼠N.confucianus聚在一起,形成了安氏白腹鼠种组的姐妹群;而梵鼠N.brahma是上述5种白腹鼠组成类群的姐妹群,灰腹鼠N.eha则与前6种白腹鼠组成类群互为姐妹群.

  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. FIMERIA CHEVRIERI SP. NOV. (APICOMPLEXA, EIMERIIDAE) FROM APODEMUS CHEVRIERI (RODENTIA, MURIDAE)%高原姬鼠一新艾美球虫记述(顶复合门,艾美球虫科)

    Institute of Scientific and Technical Information of China (English)

    胡俊杰; 谢昆; 左仰贤

    2008-01-01

    Fresh fecal samples from 31 Apodemus chevrieri M-Edwards 1868 were collected and examined for coccidian in 2006. The mice were collected in Taiping Town. Nine of the 31 (29%) specimens of mice contained two spedes of genus Eimeria. One of thern is described as new species. Sporulated oocysts of Eimeria chevrieri sp. nov. were ellipsoidal, 21.2× 16.3 (22.2-19.7 × 17.3-15.6) μm, with ovoid sporocysts, 11.2×7.5 (12.3-10.3x8.3-6.8) μm. The smooth oocysts wall had one layer arotmd 1.0μm thick. No micropyle and oocyst residuum were present, but 1-2 polar granules, sporocyst residuum, sdeda body and sub-sdeda body were present.%粪检云南省昆明市太平镇捕获的31只高原姬鼠Apodemus chevrieri,在9只高原姬鼠中共发现了2种艾美球虫,自然感染率为29%,其中1种被命名为新种:齐氏艾美球虫Eimeria chevrieri sp.nov..齐氏艾美球虫孢子化的卵囊椭圆形,大,J、为21.2μm×16.3 μm(22.2~19.7 μm×17.3~15.6/μm).卵囊壁光滑,单层,厚约1.0 μm;无胚孔和卵囊余体.有1~2个极体,极体形状不规则,直径1.0~2.0μm.卵圆形的孢子囊大小为11.2 μm ×7.5μm(12.3~10.3 μm×8.3~6.8μm),有孢子囊余体,且主要分布在2个子孢子的中间,斯氏体扁豆形,大小为1.0μm×0.3μm,亚斯氏体亚球形,大小为2.5μm ×1.5 μm.子孢子在孢子囊里面头尾相接,在其宽端有1个明显的反光体,直径约3 μm.模式标本保存在云南大学标本馆.

  17. [Genetic variation and phylogeography of the bank vole (Clethrionomys glareolus, Arvicolinae, Rodentia) in Russia with special reference to the introgression of the mtDNA of a closely related species, red-backed vole (C. rutilus)].

    Science.gov (United States)

    Abramson, N I; Rodchenkova, E N; Kostygov, A Iu

    2009-05-01

    Totally, 294 bank voles (Clethrionomys glareolus) and 18 red-backed voles (C. rutilus) from 62 sites of European Russia were studied. Incomplete sequences (967 bp) of the mitochondrial cytochrome b gene were determined for 93 C. glareolus individuals from 56 sites and 18 C. rutilus individuals from the same habitats. Analysis of the cytochrome b gene variation has demonstrated that practically the entire European part of Russia, Ural, and a considerable part of Western Europe are inhabited by bank voles of the same phylogroup, displaying an extremely low genetic differentiation. Our data suggest that C. glareolus very rapidly colonized over the presently occupied territory in the post-Pleistocene period from no more than two (central European and western European) refugia for ancestral populations with a small efficient size. PCR typing of the mitochondrial cytochrome b gene allowed us to assess the scale of mtDNA introgression from a closely related species, C. rutilus, and to outline the geographical zone of this introgression. Comparison with the red-backed vole haplotypes in the habitats shared by both species favors the hypothesis of an ancient hybridization event (mid-Holocene) and a subsequent introgression. These results suggest that the hybridization took place in the southern and middle Pre-Ural region. PMID:19534420

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

    OpenAIRE

    Guilherme Grazzini; Cássio Marcelo Mochi-Junio; Heloisa de Oliveira; Jaqueline dos Santos Pontes; Fernanda Gatto-Almeida; Liliani Marilia Tiepolo

    2015-01-01

    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 c...

  19. 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.

  20. Evolución de los géneros Mimomys, Arvicola y Allophaiomys (Arvicolidae, Rodentia, Mammalia) en el Plioceno y Pleistoceno de la Península Ibérica

    OpenAIRE

    Ruiz Bustos, A.; Sesé, C.

    1985-01-01

    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 stage...

  1. Evolucion de los géneros Mimomys, Arvicola y Allophaiomys (Arvicolidae, Rodentia, Mammalia) en el Plioceno y Pleistoceno de la Península Ibérica

    OpenAIRE

    Ruiz Bustos, Antonio; Sesé, Carmen

    1985-01-01

    RESUMEN: 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 es...

  2. Ameroséidos asociados a nidos de Neotoma mexicana Baird, 1855 (Rodentia: Muridae) y descripción de una nueva especie del género Sertitympanum Elsen y Whithaker, 1985

    OpenAIRE

    Gabriel Alberto Villegas Guzman; Griselda Montiel Parra; Margarita Vargas; Polaco, Oscar J.

    2004-01-01

    Se registra por vez primera la presencia de tres ameroseídos, Kleemannia plumigera, Ameroseius sp. y Sertitympanum sp. nov. habitando en un nido de Neotoma mexicana colectado en el estado de Durango, México.Se describe la distribución de los ácaros en los componentes que forman la estructura del nido. Asimismo, sedescribe la especie nueva del género Sertitympanum.

  3. 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

    2016-01-01

    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. PMID:27395168

  4. 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.

  5. 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

    Directory of Open Access Journals (Sweden)

    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.

  6. 新疆准噶尔盆地北缘中中新世早期的原圆齿鼠(Promylagaulinae,Mylagaulidae)%Mylagaulids (Mammalia: Rodentia) from the early Middle Miocene of northern Junggar Basin

    Institute of Scientific and Technical Information of China (English)

    吴文裕; 倪喜军; 叶捷; 孟津; 毕顺东

    2013-01-01

    Application of CT (computed tomography) scanning technology to the study of tooth morphology of mylagaulids makes better understanding the tooth structure of high-crowned mylagaulids. Two genera and species from the early Middle Miocene Halamagai Formation innorthern Junggar Basin of Xinjiang are recognized: Tschalimys ckhikvadzei Shevyreva, 1971,the senior synonym of Sinomylagaulus halamagaiensis Wu, 1988 and Simpligaulus yangi gen.et sp. nov. Both taxa undoubtedly belong to the subfamily Promylagaulinae. The integrated lithological, paleontological and paleomagnetic studies on sediments of the Late Oligocene through Late Miocene in the northern Junggar Basin of Xinjiang demonstrate that Halamagai Formation is fluvial-lacustrine sediments formed during the time coincident to the Mid-Miocene Climatic Optimum. T. ckhikvadzei and S. yangi probably inhabit the humid and warm regions with forests and densely vegetated thickets as the living mountain beaver Aplodontia rufa does. Thesemylagaulids are probably immigrants or the descendants of the immigrants from west North America.

  7. 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.

  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

    Directory of Open Access Journals (Sweden)

    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. 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

    Directory of Open Access Journals (Sweden)

    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.

  10. 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 Diferenças na composição e na riqueza de parasitas gastrointestinais de pequenos roedores (Cricetidae, Rodentia) em uma área continental e uma insular de Floresta Atlântica em Santa Catarina, Brasil

    OpenAIRE

    VV. Kuhnen; ME. Graipel; CJC. Pinto

    2012-01-01

    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 ...

  11. 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)

  12. 78 FR 2292 - Proposed Collection, Comment Request

    Science.gov (United States)

    2013-01-10

    ... service. Data are provided by period of service and a range of demographic characteristics. The supplement..., this 4th day of January 2013. Eric Molina, Acting Chief, Division of Management Systems, Bureau...

  13. Fauna helmintológica peruana: Paryphostomum huaccaci sp. n. (Echinostomotidoe parásito de Cathartes aura jota Molino, 1782

    Directory of Open Access Journals (Sweden)

    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.

  14. 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"

  15. 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.

    Directory of Open Access Journals (Sweden)

    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’...

  16. 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

    Directory of Open Access Journals (Sweden)

    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.

  17. Small mammal community structure and microhabitat use in the austral boundary of the Atlantic Forest, Brazil

    OpenAIRE

    Daniela O. de Lima; Bethânia O. Azambuja; Vagner L. Camilotti; Nilton C. Cáceres

    2010-01-01

    We investigated the richness, composition, and species relative abundance of a terrestrial small mammal community in a Deciduous Forest area in the austral boundary of the Atlantic Forest. The microhabitat use of the most common species was also investigated. Six rodents - Akodon montensis (Thomas, 1913), Oligoryzomys nigripes (Olfers, 1818), Sooretamys angouya (Thomas, 1913), Thaptomys nigrita (Lichtenstein, 1829), Mus musculus (Linnaeus, 1758) and Juliomys sp. - and one marsupial - Didelphi...

  18. 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.

  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

    Directory of Open Access Journals (Sweden)

    Tsatsenko L. V.

    2013-03-01

    Full Text Available 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.

    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...

  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.

    Directory of Open Access Journals (Sweden)

    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.

  2. Seismic and sequence stratigraphy of the central western continental margin of India: late-Quaternary evolution

    Digital Repository Service at National Institute of Oceanography (India)

    Karisiddaiah, S.M.; Veerayya, M.; Vora, K.H.

    continen- tal margin: an update. J. Geol. Soc. India 46, 157^162. Hernandez-Molina, F.J., Somoza, L., Rey, J., Pomar, L., 1994. Late Pleistocene-Holocene sediments on the Spanish conti- nental shelves: Models for very high-resolution sequence stratigraphy.... Mar. Geol. 120, 129^174. Hernandez-Molina, F.J., Somoza, L., Rey, J., 1996. Late Pleis- tocene-Holocene high-resolution sequence analysis on the Alboran Sea continental shelf. In: De Batist, M., Jacobs, P. (Eds.), Geology of Siliciclastic Shelf Seas...

  3. Measurements of absolute absorption cross sections of ozone in the 185- to 254-nm wavelength region and the temperature dependence

    Science.gov (United States)

    Yoshino, K.; Esmond, J. R.; Freeman, D. E.; Parkinson, W. H.

    1993-01-01

    Laboratory measurements of the relative absorption cross sections of ozone at temperatures 195, 228, and 295 K have been made throughout the 185 to 254 nm wavelength region. The absolute absorption cross sections at the same temperatures have been measured at several discrete wavelengths in the 185 to 250 nm region. The absolute cross sections of ozone have been used to put the relative cross sections on a firm absolute basis throughout the 185 to 255 nm region. These recalibrated cross sections are slightly lower than those of Molina and Molina (1986), but the differences are within a few percent and would not be significant in atmospheric applications.

  4. Valores hematológicos de capivaras (Hydrochoerus hydrochaeris Rodentia:Hydrochoeridae de vida livre na região de Campinas-SP Capybara's (Hydrochoerus hydrochaeris hematological values free ranging life from Campinas regions, São Paulo state, Brazil

    Directory of Open Access Journals (Sweden)

    Daniela Alves Madella

    2006-08-01

    Full Text Available O objetivo deste estudo foi determinar os valores hematológicos de 14 capivaras de vida livre capturadas nos municípios de Campinas, Monte Alegre do Sul e de São João da Boa Vista. Para a obtenção das amostras de sangue, os animais foram anestesiados via intramuscular, mediante associação de cloridrato de xilazina 2% e cloridrato de ketamina 1%, em doses de 4,5mg/kg/pv e 5,0mg/kg/pv, respectivamente. O sangue foi coletado em tubos contendo EDTA. Para a determinação dos números de eritrócitos e leucócitos, foi utilizada a metodologia tradicional da câmara de Neubauer. O hematócrito foi determinado pelo método de microhematócrito e a hemoglobina pelo método da cianometahemoglobina. Para a contagem diferencial de leucócitos, foi utilizada a técnica de Shilling. Os índices hematimétricos (VCM, HCM E CHCM foram determinados com os valores encontrados na série vermelha. Os resultados da série eritrocitária foram: 4,5 x10(6/miL ± 0,2; hemoglobina: 13.5g/dL ± 0,7; hematócrito: 40,4% ± 2; VCM: 90,2 fL ± 0,9; HCM: 30,1 pg ± 0,7; CHCM: 33,3g/dL ± 1. Na série leucocitária: 5,3 x10³/miL ± 2; bastonetes: 1 % ± 2,1; segmentados: 36,6 % ± 19,9; eosinófilos: 3,5 % ± 11,7; basófilos: 0%; linfócitos: 58,8 % ± 19,6; monócitos: 1,5% ± 2,1. Não foram encontrados os mielócitos e metamielócitos.The purpose of this study was to determine the hematological values of fourteen free life capybaras captured in three cities of São Paulo State, Brazil (Campinas, Monte Alegre do Sul and São João da Boa Vista. Blood samples were obtained with the animals anesthetized through association of 2% xilazine chloridrate and 1% ketamine chloridrate, in the doses of 4.5mg/kg/pv and 5.0mg/kg/pv respectively. The blood was collected using tubes containing EDTA. To determine the number of erythrocytes and leukocytes was used the traditional methodology of the Neubauer chamber. The hematocrit was determined by the microhematocrit method and the hemoglobin by the cianometahemoglobin. For leukocyte differential count the Shilling's method was used. The hematimetric (MCV, MCH and MCHC indexes were determined with the values found in the red serie. The results were: erythrocytes: 4.5 x10(6/mul ± 0.2; hemoglobin: 13.5g/dl ± 0.7; hematocrit: 40.4% ± 2; MCV: 90.2fl ± 0.9; MCH: 30.1pg ± 0.7; MCHC: 33.3g/dl ± 1. In the leukocytes series: 5.3 x10³/mul ± 2; band neutrophil:1 % ± 2.1; segmenter: 36.6 %± 19.9; eosinophils: 3.5% ± 11.7; basophiles: 0%; lymphocytes: 58.8% ± 19.6; monocytes: 1.5% ± 2.1. Myelocytes and metamyelocytes were not found.

  5. Avaliação de possível interferência do tabagismo na ovoposição de larvas de Calliphoridae (Díptera) em carcaça de Mus musculus L. (Rodentia: Muriade) em São Paulo, SP

    OpenAIRE

    Thais Souza Guerra; Anderson Sena Barnabe; Renato Nogueira Ferraz; Mirian P. Godoy

    2016-01-01

    A estimativa do intervalo post-mortem (IPM) é uma das principais utilizações de insetos na perícia, que pode ser fundamentado no ciclo biológico, ecologia e distribuição geográfica de uma determinada espécie, bem como o comportamento de toda fauna presente em um corpo a fim de estimar o menor intervalo possível da ocorrência da morte. Diversos fatores podem interferir no ciclo de vida de um inseto, tais como temperatura, umidade e presença de substâncias nos tecidos de uma carcaça, promovendo...

  6. 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...

  7. 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

  8. Agua malgastada y agua utilizada: observaciones sobre la modernización del regadío en el Oasis de Kuqar (Xinjiang, República Popular China)

    OpenAIRE

    Faggi, Pierpaolo

    1993-01-01

    Texto traducido por Gloria Navarro Albaladejo y revisado por Juan Antonio Marco Molina Esta investigación ha sido financiada al 60% por el Ministerio Universitario de Investigación Científica y Técnica y por el Centro Nacional de Investigación de Italia

  9. El aumento del sodio intracelular inducido por la eliminación de calcio externo regula la movilidad del espermatozoide humano /

    OpenAIRE

    Torres Flores, Víctor Manuel

    2011-01-01

     tesis que para obtener el grado de Doctor en Ciencias Biológicas, presenta Víctor Manuel Torres Flores ; asesor Alberto Darszon Israel, Luis Manuel Montaño Ramírez, Juan Arcadio Molina Guarneros. 79 páginas : ilustraciones. Doctorado en Ciencias Biológicas UNAM, Facultad de Ciencias, 2011

  10. 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).

  11. Influencia de la despolarización atrial en la velocidad de conduccion y refractariedad en la unión atrioventricular /

    OpenAIRE

    Molina Fernández de Lara, Luis Gerardo

    2012-01-01

     tesis que para obtener el grado de Doctorado en Ciencias Medicas, presenta Luis Gerardo Molina Fernández de Lara ; asesor Ruy Pérez Tamayo, David Kershenobich Stalnikowitz, Juan Garduño Espinosa75 páginas : ilustracionesDoctorado en Ciencias Medicas UNAM, Facultad de Medicina, 2012

  12. 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)

  13. 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.

  14. Libros

    OpenAIRE

    Alternativas. Cuadernos de Trabajo Social

    1995-01-01

    Contiene: Título: Las enseñanzas de Trabajo Social en España: 1932-1983. Estudio socio-educativo. Autora: Mª Victoria Molina Sánchez. Edita: Universidad Pontificia de Comillas. Madrid / por Mª Carmen Santos Aguado.

  15. Ranking de Producción Científica Mexicana. Ranking 2011

    OpenAIRE

    de Moya-Anegón, Félix; Corera-Álvarez, Elena; González-Molina, Antonio; Chinchilla-Rodríguez, Zaida

    2011-01-01

    Moya-Anegón, F. (dir.), Corera-Álvarez, E.(coord.), González-Molina, A., Chinchilla-Rodríguez, Z. Ranking de Producción Científica Mexicana. Ranking 2011. México: Foro Consultivo Científico y Tecnológico, 2011

  16. 76 FR 58649 - Endangered and Threatened Wildlife and Plants; 12-Month Finding on a Petition To List Van Rossem...

    Science.gov (United States)

    2011-09-21

    ... (Cerro Prieto geothermal generation facility) in northeast Baja California. The facility started... also located at inland localities in northeastern Baja California, Mexico (Molina and Garrett 2001, p... Medium McCaskie 1987, p. 1488; Patton 2009, Table 2. Mexico......... Baja California... Campo Geot...

  17. 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...

  18. Historien er ikke slut

    DEFF Research Database (Denmark)

    Thurah, Thomas

    , Seamus Heaney, Stefan Heym, Peer Hultberg, Per Højholt, Imre Kertész, Jan Kjærstad, Ivan Klíma, Jaan Kross, Siegfried Lenz, Claudio Magris, Antonio Muñoz Molina, Cees Nooteboom, Ljudmila Petrusjevskaja, Christoph Ransmayr, Klaus Rifbjerg, Salman Rushdie, José Saramago, Peter Seeberg, Tage Skou...

  19. Mites (Acari: Laelapidae associated with sigmodontinae rodents in Entre Ríos Province, Argentina

    Directory of Open Access Journals (Sweden)

    Abba Agustín M

    2001-01-01

    Full Text Available The richness, diversity, abundance and prevalence of mite species associated with sigmodontine rodents of different species in Entre Ríos province, Argentina are studied. Five of the six species of mites were reported for the first time in the study area. The richness and diversity of mites was higher on Oligoryzomys flavescens and O. delticola than on Akodon azarae. Androlaelaps rotundus was dominant and exhibited higher values of mean abundance and prevalence on A. azarae, Mysolaelaps microspinosus on O. flavescens and Gigantolaelaps mattogrossensis on O. delticola.

  20. Experimental infection of Rio Mamore hantavirus in Sigmodontinae rodents

    Science.gov (United States)

    de Souza, William Marciel; Machado, Alex Martins; Figueiredo, Luiz Tadeu Moraes

    2016-01-01

    This study shows an experimental spillover infection ofSigmodontinae rodents with Rio Mamore hantavirus (RIOMV).Necromys lasiurus and Akodon sp were infected with 103 RNA copies of RIOMV by intraperitoneal administration. The viral genome was detected in heart, lung, and kidney tissues 18 days after infection (ai), and viral excretion in urine and faeces began at four and six ai, respectively. These results reveal that urine and faeces of infected rodents contain the virus for at least 18 days. It is possible that inhaled aerosols of these excreta could transmit hantavirus to humans and other animals. PMID:27223653

  1. Experimental infection of Rio Mamore hantavirus in Sigmodontinae rodents.

    Science.gov (United States)

    Souza, William Marciel de; Machado, Alex Martins; Figueiredo, Luiz Tadeu Moraes

    2016-05-24

    This study shows an experimental spillover infection of Sigmodontinae rodents with Rio Mamore hantavirus (RIOMV). Necromys lasiurus and Akodon sp were infected with 103 RNA copies of RIOMV by intraperitoneal administration. The viral genome was detected in heart, lung, and kidney tissues 18 days after infection (ai), and viral excretion in urine and faeces began at four and six ai, respectively. These results reveal that urine and faeces of infected rodents contain the virus for at least 18 days. It is possible that inhaled aerosols of these excreta could transmit hantavirus to humans and other animals. PMID:27223653

  2. Ejemplares tipo de mamíferos en colecciones cubanas

    OpenAIRE

    Ramos García, Ignacio; Borroto Páez, Rafael

    2000-01-01

    Se brinda información sobre los ejemplares tipo (50 holotipos y sus paratipos) de mamíferos (Xenarthra, Insectivora, Chiroptera, Primates, Carnivora, Sirenia y Rodentia) depositados en siete colecciones cubanas. En las fichas de los holotipos se incluye la información de la descripción original y además se hacen actualizaciones y correcciones sobre este material. Information on the type specimens (50 holotypes and their paratypes) of mammals (Xenarthra, Insectivora, Chiroptera, Primates, C...

  3. Good for management, not for conservation: an overview of research, conservation and management of Italian small mammals

    OpenAIRE

    Bertolino, Sandro; Colangelo, Paolo; Mori, Emiliano; Capizzi, Dario

    2015-01-01

    Small mammals (Rodentia, Soricomorpha and Erinaceomorpha) play a crucial ecological role for their distribution and importance in food chains, as well as for being considered environmental bioindicators. Thus, they represent excellent models for understanding the evolutionary processes of ecosystems, population dynamics under changing environmental conditions, and habitat vulnerabilities. However, some rodents may help the spread of human diseases and are responsible for impacts on agricultur...

  4. Notes on the Mammals Found in Kazdağı National Park and Its Environs

    OpenAIRE

    Nuri YİĞİT; DEMİRSOY, Ali; Ahmet KARATAŞ; ÖZKURT, Şakir; ÇOLAK, Ercüment

    2006-01-01

    The present study is based on species collected and observed in Kazdağı National Park and its surroundings. Field collections yielded 40 mammal species from 6 orders: Insectivora (4), Chiroptera (14), Lagomorpha (1), Rodentia (11), Carnivora (8), and Artiodactyla (2), Of the species recorded in this study, 6 were new records from north-west Anatolia: Sorex volnuchini, Rhinolophus hipposideros, Myotis emarginatus, Eptesicus serotinus, Hypsugo savii, and Microtus subterraneus.

  5. 有袋目と貧歯目を中心とするペット用輸入哺乳類の寄生蠕虫類保有状況

    OpenAIRE

    井手, 百合子; 稲葉, 智之; 浅川, 満彦

    2000-01-01

    The survey of the parasitic helminths has been carried out on the pet animals belonging to orders Marsupialia(Philandar opossum, Trichosurus vulpecula, Dactylopsila trivirgata and Macropus eugenii), Edentata(Tamandua tetradactyla and Euphractus sexcinctus), Rodentia(Spermophilus erythrogenys and S.spilosoma)and Lagomorpha(Ochotona sp.). One acanthocephala, Giganthorhynchus sp.from T.tetradactyla, and 10 nematodes, viz., Filarinema sp.from T.vulpecula, Mackerrastrongylidae gen.sp.and Paraustro...

  6. investigations concerning the FMD-outbreak in Europe in 2001

    OpenAIRE

    Mouchantat, Susan

    2010-01-01

    Foot-and-mouth disease (FMD) is an acute febrile infectious disease characterized by the formation of vesicles and erosions on mucous membranes (squamous epithelium) of the alimentary tract and on hairless skin. In addition to the order Artiodactyla families of the order Insectivora, Rodentia, Proboscidea, Perissodactyla and Carnivora are susceptible to a foot-and-mouth disease virus (FMDV) infection. Most descriptions of FMD in naturally infected roe deer (Capreolus capreolus) in Europe a...

  7. Cellular scaling rules for rodent brains

    OpenAIRE

    Herculano-Houzel, Suzana; Mota, Bruno; Lent, Roberto

    2006-01-01

    How do cell number and size determine brain size? Here, we show that, in the order Rodentia, increased size of the cerebral cortex, cerebellum, and remaining areas across six species is achieved through greater numbers of neurons of larger size, and much greater numbers of nonneuronal cells of roughly invariant size, such that the ratio between total neuronal and nonneuronal mass remains constant across species. Although relative cerebellar size remains stable among rodents, the number of cer...

  8. Small mammal community structure and microhabitat use in the austral boundary of the Atlantic Forest, Brazil

    Directory of Open Access Journals (Sweden)

    Daniela O. de Lima

    2010-02-01

    Full Text Available We investigated the richness, composition, and species relative abundance of a terrestrial small mammal community in a Deciduous Forest area in the austral boundary of the Atlantic Forest. The microhabitat use of the most common species was also investigated. Six rodents - Akodon montensis (Thomas, 1913, Oligoryzomys nigripes (Olfers, 1818, Sooretamys angouya (Thomas, 1913, Thaptomys nigrita (Lichtenstein, 1829, Mus musculus (Linnaeus, 1758 and Juliomys sp. - and one marsupial - Didelphis albiventris (Lund, 1840 - were captured. Thaptomys nigrita is recorded in the state of Rio Grande do Sul for the first time. Species richness was poor when compared with communities in the central portions of the Atlantic Forest, but equivalent to that found in the Araucaria and Dense Ombrophilous forests of southern Brazil. The species most often captured in our study, A. montensis and O. nigripes, are also the most common in the majority of faunistic studies carried out in the Atlantic Forest. Akodon montensis and S. angouya used places with high abundance of bamboo, possibly to avoid predators. Oligorizomys nigripes used areas with a high density of scrubs, what could facilitate aboveground movements, and was negatively correlated to mature forest indicators, which reinforce the idea that this species has opportunistic habits.

  9. Mammal diversity in the middle basin of the river Tambopata, Puno, Peru

    Directory of Open Access Journals (Sweden)

    Víctor Pacheco

    2011-08-01

    Full Text Available This study documents the mammalian diversity in the Tambopata River middle basin, one of the most important information gaps in Peru. Five sites were evaluated in Puno (San Fermín 850 m, Curva Alegre 950 m, Challohuma 1200 m, Yanahuaya 1600 m, and Yanacocha 1985 m. The trapping effort was 7072 trap-nights and 201 mistnet-nights. 76 species were recorded in the study area, including 16 species under some conservation’s category. Bats and rodents were the most diverse orders (67.5%. The diversity indices of Shannon-Wiener and Simpson for small mammals show a moderate and mild negative correlation with elevation, respectively. Meanwhile the altitude is negatively correlated with the relative abundance (RA of bats, and positively with the RA of non-volant mammals. The marsupials Marmosa (Micoureus demerarae, Marmosops bishopi and Marmosops impavidus; the rodent Neacomys musseri, and bats Platyrrhinus albericoi, P. masu, P. nigellus, Eumops auripendulus and Cormura brevirostris are first records for the department of Puno. Akodon baliolus and Oxymycterus juliacae are considered valid species. The species Sturnira lilium and Akodon baliolus were those with the highest RA. Our records, added to published and unpublished data, indicate that the Río Tambopata watershed is habitat of 141 species of mammals. Finally, we recommend the extension of the southern part of the buffer zone of the PNBS to include the montane forests of Yanacocha, to protect the unique middleelevation fauna of the Río Tambopata watershed.

  10. Microhabitat of small mammals at ground and understorey levels in a deciduous, southern Atlantic forest.

    Science.gov (United States)

    Melo, Geruza L; Miotto, Barbara; Peres, Brisa; Cáceres, Nilton C

    2013-01-01

    Each animal species selects specific microhabitats for protection, foraging, or micro-climate. To understand the distribution patterns of small mammals on the ground and in the understorey, we investigated the use of microhabitats by small mammals in a deciduous forest of southern Brazil. Ten trap stations with seven capture points were used to sample the following microhabitats: liana, fallen log, ground litter, terrestrial ferns, simple-trunk tree, forked tree, and Piper sp. shrubs. Seven field phases were conducted, each for eight consecutive days, from September 2006 through January 2008. Four species of rodents (Akodon montensis, Sooretamys angouya, Oligoryzomys nigripes and Mus musculus) and two species of marsupials (Didelphis albiventris and Gracilinanus microtarsus) were captured. Captured species presented significant differences on their microhabitat use (ANOVA, p = 0.003), particularly between ground and understorey sites. Akodon montensis selected positively terrestrial ferns and trunks, S. angouya selected lianas, D. albiventris selected fallen trunks and Piper sp., and G. microtarsus choose tree trunks and lianas. We demonstrated that the local small-mammal assemblage does select microhabitats, with different types of associations between species and habitats. Besides, there is a strong evidence of habitat selection in order to diminish predation. PMID:23828340

  11. Nematode parasites of marsupials and small rodents from the Brazilian Atlantic Forest in the State of Rio de Janeiro, Brazil

    Directory of Open Access Journals (Sweden)

    Delir Corrêa Gomes

    2003-12-01

    Full Text Available Nematodes from opossums and rodents captured in the Brazilian Atlantic Forest in the State of Rio de Janeiro, Brazil were studied. From the opossums Didelphis aurita Weid-Neuweid, 1826 and Philander opossum (Linnaeus, 1758 the following nematode species were recovered: Viannaia hamata Travassos, 1914, Aspidodera raillieti Travassos, 1913, Cruzia tentaculata (Rudolphi, 1819, Travassos, 1917, Turgida turgida (Rudolphi, 1819 Travassos, 1919, Gongylonemoides marsupialis (Vaz & Pereira, 1934 Freitas & Lent, 1937, Viannaia viannai Travassos, 1914, Spirura guianensis (Ortlepp, 1924 Chitwood, 1938 and from the rodents Akodon cursor (Winger, 1887, Nectomys squamipes (Brants, 1827, Oligoryzomys eliurus (Wagner, 1845 and Oryzomys intermedius (Leche, 1886: Hassalstrongylus epsilon (Travassos, 1937 Durette-Desset, 1971, Syphacia obvelata (Rudolphi, 1802 Seurat, 1916, S. venteli Travassos, 1937, Physaloptera bispiculata Vaz & Pereira, 1935, Litomosoides carinii (Travassos, 1919 Vaz, 1934, Viannaia viannai, Hassalstrongylus epsilon, H. zeta (Travassos, 1937 Durette-Desset, 1971, Stilestrongylus aculeata (Travassos, 1918 Durette-Desset, 1971 S. eta (Travassos, 1937 Durette-Desset, 1971. Highest worm burdens and prevalences were those related to Cruzia tentaculata in marsupials. Stilestrongylus aculeata was referred for the first time in Akodon cursor.

  12. Fijacion primaria y variaciones morfologicas, durante la metamorfosis de algunos bivalvos chilenos

    Directory of Open Access Journals (Sweden)

    Juan Uribe Barichivith

    1980-12-01

    Full Text Available The larval primary settlement and the changes originated during the metamorphosis of some species of Chilean bivalves, are comparatively studied, being described, the larval and post - larval stages from the veliconcha to late plantigrade. By observing in ropes "anchovetera" nets and plankton samples, in the mitiliculture of Codihué (41º 46'S; 73º 24'W, it was verified for Mytilus chilensis Hupé, 1854 and Aulacomya ater (Molina, 1782, primary settlement on the filamentous algae of genera Enteromorpha with an average size of 33º µ high, minimum average of definitive settlement, byssus positional changes, etc. Information concerning average and number of larval and post - larval attachment to different deep and inmersión period and morphological characters of larval and post - larval of: Bankia martensi Stempell, 1898 (Teredinidae, Pholas chiloensis (Molina, 1782 (Pholadidae y Chlamys patriae Doello Jurado, 1918 (Pectinidae, are also given.

  13. El fantástico Hombre Bala

    Directory of Open Access Journals (Sweden)

    Pepa Merlo

    2011-12-01

    Full Text Available Hablar de El Fantástico hombre bala, es hablar de una pequeña joya en todos los sentidos: una cuidada edición que la editorial El Páramo mima con ilustraciones de Alicia Gómez Molina, intercaladas entre los cuentos como si se tratara de una novela gráfica, introduciéndonos magistralmente en los veintisiete relatos asombrosos del libro.

  14. Luces y sombras de la calidad de la democracia en América Latina

    OpenAIRE

    Manuel Alcántara Sáez

    2008-01-01

    El artículo analiza el concepto de calidad de la democracia, contemplando la aplicación de distintos índices a la realidad política de los países de América Latina; a saber: Freedom House, IDD (Fundación Konrad Adenauer), The Economist Intelligence Unit (EIU) y el elaborado por Levine y Molina.

  15. Phytochemical and pharmacological review of Lagenaria sicereria

    OpenAIRE

    Rakesh P Prajapati; Manisha Kalariya; Parmar, Sachin K.; Sheth, Navin R.

    2010-01-01

    Lagenaria siceraria (Molina) standley (LS) (Family: Cucurbitaceae) is an annual herbaceous climbing plant with a long history of traditional medicinal uses in many countries, especially in tropical and subtropical regions. Since ancient times the climber has been known for its curative properties, and has been utilized for treatment of various ailments, including jaundice, diabetes, ulcer, piles, colitis, insanity, hypertension, congestive cardiac failure (CCF), and skin diseases. Its fruit p...

  16. Temporal evolution of adherents of the major religions in Mexico: Avrami model application-Kolgomorov solid training

    OpenAIRE

    Avilés, Mauricio González; Campuzano, Hermelinda Servín

    2013-01-01

    It applies a mathematical model of solid formation, the model of Avrami-Kolgomorov [Ausloos & Petroni, 2007] to model the time evolution of percentage of adherents of the major religions practiced in Mexico, adjusting the corresponding parameters with available records in the period from 1950 to 2000 [Molina-Hernandez, 2003; INEGI, 2005]. A comparison is made with the application of the model to global trends and concludes that Catholicism is in a marked disaggregation and trends of Christian...

  17. Nuevas adiciones de bivalvos a la malacofauna marina peruana

    Directory of Open Access Journals (Sweden)

    Carlos Paredes

    2014-06-01

    Full Text Available Cuatro especies de moluscos bivalvos marinos, Nuculana (Jupiteria cuneata (Sowerby, 1833, Isognomon (Isognomón janus Carpenter, 1857, Ostrea conchaphila Carpenter, 1857 y Mysella (Rochefortia molinae Ramorino, 1968 se reportan por primera vez para el mar peruano. Se incluye datos sobre la distribución geográfica y el hábitat de cada una de las especies.

  18. Erectile Dysfunction Among HIV Patients Undergoing Highly Active Antiretroviral Therapy: Dyslipidemia as a Main Risk Factor

    Directory of Open Access Journals (Sweden)

    Gustavo Romero‐Velez, MD

    2014-04-01

    Conclusions: ED is highly prevalent in HIV patients. Dyslipidemia should be considered as a risk factor for ED in HIV patients. Romero‐Velez G, Lisker‐Cervantes A, Villeda‐Sandoval CI, Sotomayor de Zavaleta M, Olvera‐Posada D, Sierra‐Madero JG, Arreguin‐Camacho LO, and Castillejos‐Molina RA. Erectile dysfunction among HIV patients undergoing highly active antiretroviral therapy: Dyslipidemia as a main risk factor. Sex Med 2014;2:24–30.

  19. Inhibitory action of some essential oils and phytochemicals on the growth of various moulds isolated from foods

    OpenAIRE

    Evandro Leite de Souza; Edeltrudes de Oliveira Lima; Kristerson Reinaldo de Luna Freire; Cristina Paiva de Sousa

    2005-01-01

    The aim of this study was to determine the sensitivity profile of mould strains isolated from foods to some essential oils and phytochemicals. The assayed mould strains were: Fusarium spp., Rhizopus spp., Aspergillus flavus, A. niger and Penicillium spp. According to results, Lippia alba N.E. Brown, Peumus boldus Molina, Lippia microphylla Phil., Citrus limon Risso and Cymbopogon citratus Stapf. essential oil and the phytochemicals citral, eugenol and mircene showed prominent antimould activi...

  20. Ethnobotany of Hulu(Lagenaria siceraria)%葫芦的民族植物学

    Institute of Scientific and Technical Information of China (English)

    陈重明

    2002-01-01

    @@ 葫芦(Lagenaria siceraria(Molina)Standl.)系葫芦科植物,在我国有着悠久的应用的历史,在古代人民的经济生活和医疗活动中均有重要的地位,而且在民俗文化方面更有丰富的内容,和宗教、植物崇拜有着密切的关系.

  1. What would have happened to the ozone layer if chlorofluorocarbons (CFCs) had not been regulated?

    OpenAIRE

    Newman, P. A; L. D. Oman; A. R. Douglass; Fleming, E. L.; S. M. Frith; M. M. Hurwitz; Kawa, S.R.; Jackman, C. H.; N. A. Krotkov; Nash, E. R.; Nielsen, J. E.; S. Pawson; R. S. Stolarski; G. J. M. Velders

    2009-01-01

    Ozone depletion by chlorofluorocarbons (CFCs) was first proposed by Molina and Rowland in their 1974 Nature paper. Since that time, the scientific connection between ozone losses and CFCs and other ozone depleting substances (ODSs) has been firmly established with laboratory measurements, atmospheric observations, and modeling research. This science research led to the implementation of international agreements that largely stopped the production of ODSs. In this study we use a fully-c...

  2. Overfishing population characteristics of razor clam, Ensis macha, from Independencia Bay, Peru, in 2004 year

    OpenAIRE

    Juan Tarazona; Jürgen Laudien

    2011-01-01

    Quantitative monthly samplings, in 2004, were carried out to estimate the density and biomass of Ensis macha (Molina 1782), from Morro Quemado area, Bay Independence, Pisco. The present study analyzes biometric relationships, growth parameters and somatic production using the ELEFAN I routine and the Crisp’s method. During the year 2004 the rate of exploitation (E= 0.69 y-1) was significantly bigger than the values of 2003 and the monthly landings (maximum of 335 t) and fishing effort (maximu...

  3. Cytogenetic characterization of Caesalpinia spinosafrom Tarma and Palca (Junín

    Directory of Open Access Journals (Sweden)

    Alberto López

    2014-03-01

    Full Text Available Somatic chromosomes of Caesalpinia spinosa (Feuillée ex Molina Kuntze, “Tara”, wild populations of Huinco and Palca (Junín regions were studied. The specie were diploid (2n=24. Chromosomes were small. The karyotypes showed the same chromosome number, they found differences in morphological parameters of the same, with the karyotype formula for the town of Huinco: 6m + 6 sm and the town of Palca: 5m + 7 sm.

  4. Ethanol-mediated operant learning in the infant rat leads to increased ethanol intake during adolescence

    OpenAIRE

    Ponce, Luciano Federico; Pautassi, Ricardo Marcos; Norman E. Spear; Molina, Juan Carlos

    2008-01-01

    Recent studies indicate that the infant rat has high affinity for ethanol ingestion and marked sensitivity to the drug’s reinforcing effects (Spear & Molina, 2005). A novel operant technique was developed to analyze reinforcing effects of ethanol delivery during the third postnatal week. The impact of this ethanol-reinforcement experience upon subsequent ethanol consumption during adolescence (postnatal weeks 5–6 was also examined. In Experiment 1, pups (postnatal days 14–17 were given an exp...

  5. Una nueva especie de Iragua Melichar, 1926 (Insecta: Homoptera: Cicadellidae

    Directory of Open Access Journals (Sweden)

    Pedro W. Lozada

    2014-06-01

    Full Text Available Se describe e ilustra una nueva especie de Iragua Melichar, I. chola sp. n., de material procedente de la Zona Reservada de Tambopata, departamento de Madre de Dios, y de Chanchamayo, departamento de Junín, en Perú. El material tipo se encuentra depositado en las colecciones del Museo Nacional de Historia Natural y del Museo de Entomología de la Universidad Nacional Agraria La Molina, Lima, Perú.

  6. Informe de calidad y datos de producción centífica (2003-2009) en Telecomunicaciones y Sociedad de la Información.

    OpenAIRE

    de Moya-Anegón, Félix; Chinchilla-Rodríguez, Zaida; Corera-Álvarez, Elena; González-Molina, Antonio; López-Illescas, Carmen; Vargas-Quesada, Benjamín

    2012-01-01

    Moya-Anegón, F. (dir.), Chinchilla-Rodríguez, Z. (coord.), Corera-Álvarez, E., González-Molina, A., López-Illescas, C., Vargas-Quesada, B. Informe de calidad y datos de producción centífica (2003-2009) en Telecomunicaciones y Sociedad de la Información. NIPO: 720-12-041-0

  7. Informe de calidad y datos de producción científica (2003-2009) en Biotecnología.

    OpenAIRE

    de Moya-Anegón, Félix; Chinchilla-Rodríguez, Zaida; Corera-Álvarez, Elena; González-Molina, Antonio; López-Illescas, Carmen; Vargas-Quesada, Benjamín

    2012-01-01

    Moya-Anegón, F. (dir.), Chinchilla-Rodríguez, Z. (coord.), Corera-Álvarez, E., González-Molina, A., López-Illescas, C., Vargas-Quesada, B. Informe de calidad y datos de producción científica (2003-2009) en Biotecnología. Madrid: Fundación Española para la Ciencia y la Tecnología, 2012. NIPO: 720-12-041-0

  8. Principales Indicadores Cienciométricos de la Actividad Científica de la Universidad de Antioquia. Informe 2013

    OpenAIRE

    de Moya-Anegón, Félix; Bustos-Gonzalez, Atilio; Chinchilla-Rodríguez, Zaida; Corera-Álvarez, Elena; González-Molina, Antonio; López-Illescas, Carmen; Vargas-Quesada, Benjamín

    2013-01-01

    Moya-Anegón, F. (dir.), Bustos-González, A. (coord.), Chinchilla-Rodríguez, Z. (coord.), Corera-Álvarez, E., López-Illescas, C., González-Molina, A., López-Illescas, C., Vargas-Quesada, B. Principales Indicadores Cienciométricos de la Actividad Científica de la Universidad de Antioquia. Informe 2013. Bogotá: Universidad de Antioquia, 2013

  9. Scientific Output by Gender in Spain (Web of Science, 2004)

    OpenAIRE

    de Moya-Anegón, Félix; Chinchilla-Rodríguez, Zaida; Vargas-Quesada, Benjamín; Corera-Álvarez, Elena; González-Molina, Antonio; Guerrero-Bote, Vicente; Gómez-Crisóstomo, Rocío

    2007-01-01

    Moya-Anegón, F., Chinchilla-Rodríguez, Z., Vargas-Quesada, B., Corera-Álvarez, E., González-Molina, A., Muñoz-Fernández, F.J., Guerrero-Bote, V.P., Gómez-Crisóstomo, R. (2007) Scientific Output by Gender in Spain (Web of Science, 2004) 11 International Conference of the International Society for Scientometrics and Informetrics. Madrid, Spain, 25-27 June

  10. STUDY OF SOIL AMPLIFICATION BASED ON MICROTREMOR AND SEISMIC RECORDS IN LIMA PERU

    Science.gov (United States)

    Calderon, Diana; Sekiguchi, Toru; Nakai, Shoichi; Aguilar, Zenon; Lazares, Fernando

    The dynamic characteristics of the ground in Lima, capital of Peru, specifically the amplification are investigated. By using the small and large microtremor array measurements we estimated the soil velocity profiles with depths to the bedrock in many cases. These profiles were used to estimate the amplification factors. Important results are the large amplification factors at EMO, VSV, CAL and CMA (La Molina, Villa El Salvador, El Callao and Bellavista district, respectively).

  11. 编辑推荐

    Institute of Scientific and Technical Information of China (English)

    2013-01-01

    摩卡站 With the success of their two restaurants, Mosto and Modo Urban Deli, chef Daniel Urdaneta, from Venezuela, and co- owner Alex Molina, from Columbia, are now embarking on a new concept for their cuisine empire. Moka Bros opened last month in Nali Patio, Sanlitun, and the partners' concept is for the eatery to be a casual spot tbr urban diners to relax and have access to clean, healthy and affordable food.

  12. Genetic diversity and germplasm conservation of three minor Andean tuber crop species

    OpenAIRE

    Malice M.; Baudoin JP.

    2009-01-01

    In traditional Andean agrosystems, three minor tuber crop species are of regional or local importance: oca (Oxalis tuberosa Molina), ulluco (Ullucus tuberosus Caldas) and mashua (Tropaeolum tuberosum Ruiz and Pav.). Genetic diversity within these species is very large and could result from the high ecological and cultural variability that characterizes the Andean area. Nowadays, many anthropic or ecological factors cause the loss of diversity and contribute to genetic erosion. The development...

  13. Fijacion primaria y variaciones morfologicas, durante la metamorfosis de algunos bivalvos chilenos

    OpenAIRE

    Juan Uribe Barichivith; Daniel López Stefoni

    1980-01-01

    The larval primary settlement and the changes originated during the metamorphosis of some species of Chilean bivalves, are comparatively studied, being described, the larval and post - larval stages from the veliconcha to late plantigrade. By observing in ropes "anchovetera" nets and plankton samples, in the mitiliculture of Codihué (41º 46'S; 73º 24'W), it was verified for Mytilus chilensis Hupé, 1854 and Aulacomya ater (Molina, 1782), primary settlement on the filamentous algae of genera En...

  14. [Reseñas Bibliográficas] Atlas de la flora vascular silvestre de Burgos

    Directory of Open Access Journals (Sweden)

    Iñaki Aizpuru

    2005-01-01

    Full Text Available Es una reseña bibliográfica de la obra, Atlas de la flora vascular silvestre de Burgos / Alejandre Sáenz, J.M. García-López, L. Marín Padellano, G. Mateo Sanz, E. Miguélez del coso, C. Molina Martín, G. Montamarta Prieto, S. Patino Sánchez, M.A. Pinto Cebrián 6 J. Valencia Janices.

  15. CHITEC, Invovation Changes the World%CHITEC,Invovation Changes the World

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    @@ Platform to show Pablo Molina Petrovich,general manager architect of Architectural Office Association of Chile,is satisfied with what he has achieved by displaying a promotion booth for his newly-established China office at the 12th CHITEC."Our Beijing office was just established at the early January this year,so it's high time to promote ourselves to be more familiar with Chinese.China now is full of opportunities here," he said.

  16. Microhabitat of small mammals at ground and understorey levels in a deciduous, southern Atlantic Forest

    Directory of Open Access Journals (Sweden)

    GERUZA L. MELO

    2013-06-01

    Full Text Available Each animal species selects specific microhabitats for protection, foraging, or micro-climate. To understand the distribution patterns of small mammals on the ground and in the understorey, we investigated the use of microhabitats by small mammals in a deciduous forest of southern Brazil. Ten trap stations with seven capture points were used to sample the following microhabitats: liana, fallen log, ground litter, terrestrial ferns, simple-trunk tree, forked tree, and Piper sp. shrubs. Seven field phases were conducted, each for eight consecutive days, from September 2006 through January 2008. Four species of rodents (Akodon montensis, Sooretamys angouya, Oligoryzomys nigripes and Mus musculus and two species of marsupials (Didelphis albiventris and Gracilinanus microtarsus were captured. Captured species presented significant differences on their microhabitat use (ANOVA, p = 0.003, particularly between ground and understorey sites. Akodon montensis selected positively terrestrial ferns and trunks, S. angouya selected lianas, D. albiventris selected fallen trunks and Piper sp., and G. microtarsus choose tree trunks and lianas. We demonstrated that the local small-mammal assemblage does select microhabitats, with different types of associations between species and habitats. Besides, there is a strong evidence of habitat selection in order to diminish predation.Cada espécie animal pode apresentar seletividade por micro-habitats priorizando proteção, forrageio ou microclima. Para compreender os padrões de distribuição de pequenos mamíferos ao nível do solo e de sub-bosque, nós analisamos o uso de micro-habitat por pequenos mamíferos em uma floresta estacional no sul do Brasil. Dez estações amostrais com sete pontos de captura foram usadas para amostragem dos seguintes microhabitats: liana, tronco caído, solo apenas coberto por folhiço, solo coberto por samambaias, árvore com tronco simples, árvore com bifurcações e arbustos do g

  17. Diagnosis of hantavirus infection in humans and rodents in Ribeirão Preto, State of São Paulo, Brazil Diagnóstico de infecção por hantavírus em humanos e roedores em Ribeirão Preto, Estado de São Paulo

    Directory of Open Access Journals (Sweden)

    Glauciane Garcia de Figueiredo

    2010-08-01

    Full Text Available INTRODUCTION: Hantavirus pulmonary and cardiovascular syndrome (HPCS is an emerging serious disease in the Americas. Hantaviruses (Bunyaviridae are the causative agents of this syndrome and are mainly transmitted through inhalation of aerosols containing the excreta of wild rodents. In the Ribeirão Preto region (state of São Paulo, Brazil, HPCS has been reported since 1998, caused by the Araraquara virus (ARAV, for which Necromys lasiurus is the rodent reservoir. This study aimed to show diagnostic results relating to infection in humans and rodents, obtained at the Virology Research Center of the Ribeirão Preto School of Medicine, University of São Paulo, between 2005 and 2008. METHODS: HPCS was diagnosed by means of ELISA and/or RT-PCR in 11 (21.2% out of 52 suspected cases, and 54.4% of these were fatal. Furthermore, 595 wild rodents (Necromys lasiurus, Akodon sp, Calomys tener and Oligoryzomys sp were caught between 2005 and 2008. RESULTS: Fifteen (2.5% of these rodents presented antibodies for hantavirus, as follows: Necromys lasiurus (4%, Calomys tener (1.9% and Akodon sp (1.5%. Nucleotide sequences obtained through RT-PCR from one HPCS patient and one Calomys tener rodent were compared with hantavirus sequences from GenBank, which showed that both were homologous with ARAV. CONCLUSIONS: This work corroborates previous studies showing that ARAV is the hantavirus causing HPCS in the Ribeirão Preto region. It also shows that rodents infected with hantavirus represent a constant risk of transmission of this virus to man.INTRODUÇÃO: A síndrome pulmonar e cardiovascular por hantavírus é uma doença grave emergente nas Américas. Os hantavírus, Bunyaviridae, são os agentes causadores desta síndrome, causadas, principalmente, pela inalação de aerossóis dos dejetos de roedores silvestres. Na região de Ribeirão Preto, a SPCVH, causada pelo vírus Araraquara, tem sido diagnosticada, desde 1998. O roedor-reservatório do ARAV é o

  18. Toxoplasma gondii antibodies in wild rodents and marsupials from the Atlantic Forest, state of São Paulo, Brazil.

    Science.gov (United States)

    Gennari, Solange Maria; Ogrzewalska, Maria Halina; Soares, Herbert Sousa; Saraiva, Danilo Gonçalves; Pinter, Adriano; Nieri-Bastos, Fernanda Aparecida; Labruna, Marcelo Bahia; Szabó, Matias Pablo Juan; Dubey, Jitender Prakash

    2015-01-01

    Toxoplasma gondii is a protozoan parasite that infects a large spectrum of warm-blooded animals, including humans. Small rodents and marsupials play an important role in the epidemiology of T. gondii because they are sources of infection for domestic and feral cats. Serum samples from 151 rodents and 48 marsupials, captured in the Atlantic Forest, São Paulo State, southeastern Brazil, were analyzed for the presence of T. gondii antibodies. Antibodies detected by the modified agglutination test (MAT ≥ 25) were found in 8.6% (13/151) of the rodents and 10.4% (5/48) of the marsupials, with titers ranging from 25 to 6400 and from 25 to 3200, respectively for the rodents and marsupials. Three of the eight species of rodents (Akodon spp., Oligoryzomys nigripesand Rattus norvegicus), and one from the four marsupial species (Didelphis aurita) presented positive animals. T. gondii was described for the first time in the rodent Oligoryzomys nigripes. PMID:26444068

  19. Small todents fleas from the bubonic plague focus located in the Serra dos Órgãos Mountain Range, State of Rio de Janeiro, Brazil

    Directory of Open Access Journals (Sweden)

    Raimundo Wilson de Carvalho

    2001-07-01

    Full Text Available Eleven species of fleas were collected from 601 small rodents, from November 1995 to October 1997, in areas of natural focus of bubonic plague, including the municipalities of Nova Friburgo, Sumidouro and Teresópolis, State of Rio de Janeiro, Brazil. Among 924 fleas collected, Polygenis (Polygenis rimatus (Rhopalopsyllidae was the predominant species regarding the frequency, representing 41.3% (N:382, followed by P. (Neopolygenis pradoi, representing 20% (N:185 and Craneopsylla minervaminerva (Stephanocircidae, representing 18.9% (N:175. The host Akodon cursor harbored 47.9% of these fleas. Other six host species were infested by 52.1% of the remaining fleas. Fleas were found on hosts and in places within the focus not previously reported by the literature.

  20. Why can't rodents vomit? A comparative behavioral, anatomical, and physiological study.

    Directory of Open Access Journals (Sweden)

    Charles C Horn

    Full Text Available The vomiting (emetic reflex is documented in numerous mammalian species, including primates and carnivores, yet laboratory rats and mice appear to lack this response. It is unclear whether these rodents do not vomit because of anatomical constraints (e.g., a relatively long abdominal esophagus or lack of key neural circuits. Moreover, it is unknown whether laboratory rodents are representative of Rodentia with regards to this reflex. Here we conducted behavioral testing of members of all three major groups of Rodentia; mouse-related (rat, mouse, vole, beaver, Ctenohystrica (guinea pig, nutria, and squirrel-related (mountain beaver species. Prototypical emetic agents, apomorphine (sc, veratrine (sc, and copper sulfate (ig, failed to produce either retching or vomiting in these species (although other behavioral effects, e.g., locomotion, were noted. These rodents also had anatomical constraints, which could limit the efficiency of vomiting should it be attempted, including reduced muscularity of the diaphragm and stomach geometry that is not well structured for moving contents towards the esophagus compared to species that can vomit (cat, ferret, and musk shrew. Lastly, an in situ brainstem preparation was used to make sensitive measures of mouth, esophagus, and shoulder muscular movements, and phrenic nerve activity-key features of emetic episodes. Laboratory mice and rats failed to display any of the common coordinated actions of these indices after typical emetic stimulation (resiniferatoxin and vagal afferent stimulation compared to musk shrews. Overall the results suggest that the inability to vomit is a general property of Rodentia and that an absent brainstem neurological component is the most likely cause. The implications of these findings for the utility of rodents as models in the area of emesis research are discussed.

  1. [Presence in a rodent of Chili of the nematode Inglamidinae (sub. fam. nov.) belonging to Amidostomatidae, a family known to be found in mammals of Australia].

    Science.gov (United States)

    Durette-Desset, M C; Denke, M A; Murua, R

    1976-01-01

    The Inglamidinae n. sub-fam., a new sub-family of Amidostomatidae from chilean Cricetidae is described with Inglamidum akodon gen. et sp. n. as the type genus and species. Out of the 23 Akodon captured in the same area, three samples of this nematode have been collected from two different species. These findings confirm that we are dealing with a well-adapted parasite and exclude the possibility of a fortuitous catch or an accidental transfer. This family displays two significant groups of taxonomic characters, including archaic characters such as cephalic structures which unite them to the Amidostomatidae, and on the other hand some more recently elaborated characters such as monodelphism and shape of synlophe and spicules which relate them to the Heligmosoms and more significantly to the line Viannaia-Viannella parasite of South-American Marsupials. We interpret this species as a "parasite of capture" and we assume that very similar species might occur in other endemic Mammals, mostly Marsupials. On a paleobiogeographical point of view this interpretation would make due allowance for postulating that the Amidostomatidae from Mammals have originated during the Secondary concurrently with the Marsupial expansion. These ancestral Nematodes would have given birth to the other Trichostrongyloidea through reduction of buccal cavity, and to the Ancylostomatoidea by further elaboration of buccal apparatus. Contrary to Inglis's hypothesis we are in favour of the genera Globocephaloides and Hypodontus to be assigned to the Globocephalinae and Uncinariinae (Ancylostomatidae) respectively, rather than to the Amidostomatidae. The occurrence of an Amidostomatidae in a South American Cricetidae is somewhat quite unexpected, mostly because this family is known to occur from australian Mammals only and also because the parasited Mammals are the most primitive of the group (Monotremes and Marsupials). PMID:984673

  2. Infecções naturais de mamíferos silvestres em área endêmica de leishmaniose tegumentar do Estado de São Paulo, Brasil Natural infection of sylvatic mammals of cutaneous leishmaniasis in S. Paulo State, Brazil

    Directory of Open Access Journals (Sweden)

    Oswaldo Paulo Forattini

    1972-09-01

    Full Text Available Descreve-se a presença de foco de leishmaniose tegumentar no vale do rio Moji-Guaçú, em região comum aos municípios de Luiz Antonio, São Carlos, Rincão e Santa Rita do Passa Quatro, no Estado de São Paulo, Brasil. Os casos humanos apresentavam formas clínicas caracterizadas por lesões úlcero-vegetantes, de evolução lenta e pobres em parasitos. As investigações sobre infecção natural em animais silvestres levou ao isolamento de roedores, de três cepas em cultura, duas procedentes de Akodon arviculoides e uma de Oryzomys nigripes. As provas de inoculação em hamsters foram, até o momento, positivas para duas delas, mas com evolução lenta, com manifestações clínicas muito discretas e pobres em parasitos. Pelos dados disponíveis até o momento, parece tratar-se de cepas filiáveis à raça "lenta", à qual se atribui papel na etiologia da forma cutaneo-mucosa da leishmaniose.An endemic area of cutaneous leishmaniasis in the State of S. Paulo, Brazil, is described. Clinical aspects of human cases showed few lesions with slow evolution and few parasites. From investigations on natural infections of local sylvatic mammals by skin cultures technique ensued three strains isolations from Akodon arviculoides and Oryzomys nigripes rodents. Two of these showed to infect hamsters experimentally, but with discrete cutaneous manifestations and few parasites. This aspect seems to be alike the behaviour of "slow" strain, who was included in the possibility of the mucocutaneous leishmaniasis etiology. The presence of sylvatic enzootic forms of the disease is concluded.

  3. Distribución de fibronectina y laminina en el corpúsculo renal de diversas especies de roedores

    OpenAIRE

    Götzens Garcia, Guadalupe

    2004-01-01

    [spa] Objetivos: El objeto de estudio es la membrana basal glomerular (M.B.G.) y la distribución de dos de las moléculas estructurales de las matrices extracelulares del corpúsculo renal, la fibronectina y la laminina. el estudio se ha realizado con cuatro especies aparentemente próximas de un mismo grupo zoológico (Rodentia) dado que experimentalmente, se incorporan nuevas especies como animales de laboratorio, comparando un animal estándar de laboratorio, con especies silvestres, con distin...

  4. Sociální chování u morčete domácího (Cavia aperea, f. porcellus)

    OpenAIRE

    Vojtěchová, Dominika

    2012-01-01

    Summary The theme of my thesis is „Social behavior in domestic guinea pig“. I wanted to focus not only on the actual social behavior of guinea pigs, but also basic information about guinea pigs. The first part of this thesis deals with the taxonomic classification of guinea pigs and rodents desscribing the order (Rodentia). In the next part I originaly dealt with guinea pigs, their domestication, and probably originated as the name of the guinea pig. Then I dealt with relatives of guin...

  5. Clinical aspects of rodent dental anatomy.

    Science.gov (United States)

    Crossley, D A

    1995-12-01

    The order Rodentia is vast, encompassing a large number of species with significant anatomical variations developed during natural adaptation to differing habitats. Many veterinarians have little knowledge of the anatomy of species other than the commoner domestic large herbivores and small carnivores. Clinicians require a basic knowledge of the relevant anatomy of species they are likely to be asked to treat. This article provides sufficient working knowledge of the oral and dental anatomy of those rodents commonly kept as pets to enable veterinarians to interpret clinical and radiographic findings when investigating suspected dental disease.

  6. Anatomy and Disorders of the Oral Cavity of Rat-like and Squirrel-like Rodents.

    Science.gov (United States)

    Mancinelli, Elisabetta; Capello, Vittorio

    2016-09-01

    The order Rodentia comprises more than 2000 species divided into 3 groups based on anatomic and functional differences of the masseter muscle. Myomorph and sciuromorph species have elodont incisors and anelodont cheek teeth, unlike hystrichomorph species which have full anelodont dentition. Diseases of incisors and cheek teeth of rat-like and squirrel-like rodents result in a wide variety of symptoms and clinical signs. Appropriate diagnostic testing and imaging techniques are required to obtain a definitive diagnosis, formulate a prognosis, and develop a treatment plan. A thorough review of elodontoma, odontoma, and pseudo-odontoma is provided, including treatment of pseudo-odontomas in prairie dogs.

  7. Sivi puh (Glis glis Linnaeus, 1766), od ulova do namirnice

    OpenAIRE

    Konjević, Dean; Krapinec, Krešimir

    2004-01-01

    Sivi puh (Glis glis L.) je naša autohtona divljač iz reda glodavaca (Rodentia), porodice puhova (Myoxidae) i roda puh (Glis). Tradicija lova na puhove je iznimno stara i potječe još od vremena Rimskog Carstva. U Republici Hrvatskoj se lov na puhove do danas održao na području Gorskog kotara i Like. Za razliku od negdašnjeg pristupa, danas se sivi puh lovi isključivo posebno konstruiranim lovkama, pri čemu je za lov neophodno dobiti odgovarajuću dozvolu. Ulovljeni puhovi koriste se u prehrani,...

  8. Seed predation by mammals in forest fragments in Monteverde, Costa Rica.

    Science.gov (United States)

    Chinchilla, Federico A

    2009-09-01

    Few studies have evaluated seed predation in fragmented landscapes, in which lower species diversity is expected to modifying ecological interactions. The rates of seed removal by mammals were investigated in a continuous forest and two fragmented patches of Premontane Tropical Moist Forest, in Monteverde, Costa Rica. The composition of mammalian seed-predators in each site was recorded during 16 months. The removal of four native tree species of experimental seeds: Ocotea valeriana and Ocotea whitei (Lauraceae), Panopsis costaricensis (Proteaceae) and Billia colombiana (Hippocastanaceae) in forest understories was followed during two annual fruiting seasons for each species. Results indicated similar species composition of seed-predators between continuous forest, the largest fragment (350 ha). However the smaller fragment (20 ha), had fewer seed predators. In this fragment, the specialized seed predator Heteromys desmarestianus (Rodentia) was more abundant. Unexpectedly, seed-predation in the two forest fragments and the continuous forest did not differ statistically for any of the seed species. Apparently, the higher abundance of small seed-predators in the fragments was compensated by the absence of medium and large seed-predators, like Agouti paca, Dasyprocta punctata (both Rodentia) and Pecari tajacu (Artiodactyla) recorded in continuous forest. Removal of experimentally-placed seeds was higher when the number of naturally occurring seeds in the sites was lower. This result could best be attributed to differential satiation of seed predators rather than differences in richness or abundance of seed predators.

  9. Masticatory (;superfast') myosin heavy chain and embryonic/atrial myosin light chain 1 in rodent jaw-closing muscles.

    Science.gov (United States)

    Reiser, Peter J; Bicer, Sabahattin; Chen, Qun; Zhu, Ling; Quan, Ning

    2009-08-01

    Masticatory myosin is widely expressed among several vertebrate classes. Generally, the expression of masticatory myosin has been associated with high bite force for a carnivorous feeding style (including capturing/restraining live prey), breaking down tough plant material and defensive biting in different species. Masticatory myosin expression in the largest mammalian order, Rodentia, has not been reported. Several members of Rodentia consume large numbers of tree nuts that are encased in very hard shells, presumably requiring large forces to access the nutmeat. We, therefore, tested whether some rodent species express masticatory myosin in jaw-closing muscles. Myosin isoform expression in six Sciuridae species was examined, using protein gel electrophoresis, immunoblotting, mass spectrometry and RNA analysis. The results indicate that masticatory myosin is expressed in some Sciuridae species but not in other closely related species with similar diets but having different nut-opening strategies. We also discovered that the myosin light chain 1 isoform associated with masticatory myosin heavy chain, in the same four Sciuridae species, is the embryonic/atrial isoform. We conclude that rodent speciation did not completely eliminate masticatory myosin and that its persistent expression in some rodent species might be related to not only diet but also to feeding style. PMID:19648394

  10. Species identification key of Korean mammal hair.

    Science.gov (United States)

    Lee, Eunok; Choi, Tae-Young; Woo, Donggul; Min, Mi-Sook; Sugita, Shoei; Lee, Hang

    2014-05-01

    The hair microstructures of Korean terrestrial mammals from 23 species (22 wild and one domestic) were analyzed using light and scanning electron microscopy (SEM) to construct a hair identification key. The hairs were examined using the medulla structures and cuticular scales of guard hairs from the dorsal regions of mature adult animals. All cuticular scale structures in the hair of Rodentia, Lagomorpha, Carnivora and Insectivora showed the petal pattern, and those of Artiodactyla and Chiroptera showed the wave pattern and coronal pattern, respectively. Rodentia, Lagomorpha and Carnivora showed multicellular, and Insectivora and Artiodactyla showed unicellular regular, mesh or columnar in the medulla structures, respectively. Chiroptera did not show the medulla structures in their hair. We found that it is possible to distinguish between species and order based on general appearance, medulla structures and cuticular scales. Thus, we constructed a hair identification key with morphological characteristics from each species. This study suggests that hair identification keys could be useful in fields, such as forensic science, food safety and foraging ecology.

  11. Variación anual de las propiedades insecticidas de Peumus boldus sobre Sitophilus zeamais Annual variation of insecticide properties of Peumus boldus on Sitophilus zeamais

    OpenAIRE

    Felipe Pérez; Gonzalo Silva; Maritza Tapia; Ruperto Hepp

    2007-01-01

    El objetivo del presente trabajo fue determinar la variación anual en las propiedades insecticidas de Peumus boldus Molina, en el control de Sitophilus zeamais Motschulsky, bajo condiciones de laboratorio. El polvo de hojas de P. boldus se evaluó durante 12 meses, en concentraciones de 0,5, 1 y 2% (p/p). Se evaluaron 36 tratamientos con tres repeticiones, en un diseño experimental completamente al azar, con un arreglo factorial. Se determinó el porcentaje de mortalidad y emergencia de insecto...

  12. Genetic diversity and germplasm conservation of three minor Andean tuber crop species

    Directory of Open Access Journals (Sweden)

    Malice M.

    2009-01-01

    Full Text Available In traditional Andean agrosystems, three minor tuber crop species are of regional or local importance: oca (Oxalis tuberosa Molina, ulluco (Ullucus tuberosus Caldas and mashua (Tropaeolum tuberosum Ruiz and Pav.. Genetic diversity within these species is very large and could result from the high ecological and cultural variability that characterizes the Andean area. Nowadays, many anthropic or ecological factors cause the loss of diversity and contribute to genetic erosion. The development of conservation strategies for genetic resources of Andean tubers, in situ as well as ex situ, includes a better knowledge of diversity in addition to the study of Andean farming strategies linked to this genetic diversity.

  13. De la capa al agujero: los descuidos de la ciencia

    OpenAIRE

    Orozco-Martínez, Carlos E.

    1997-01-01

    Diez años después de la firma del Protocolo de Montreal para regular el uso de sustancias nocivas para la capa de ozono, firmado por 24 países en 1987, se reseñan algunos inventos tecnológicos que si bien hacen la vida cotidiana más cómoda, continúan ocasionando daños a la capa de ozono. Asimismo, se presentan las batallas libradas hasta entonces por los científicos Mario Molina y Sherwood Rowland para que se reconocieran los efectos dañinos de los clorofluorocarbonos. Se incluye la reproducc...

  14. Reseñas de Libros

    OpenAIRE

    José Francisco Tinao Martín-Peña; José Luis Gutiérrez Molina; David Molina Rabadán; Alejandro Román Antequera; Jesús Fernández García; Roberto Germán Fandiño Pérez; Rafael Gómez Sánchez; Julio Pérez Serrano; Leonardo Mazzei de Grazia; Joaquín Piñeiro Blanca

    2008-01-01

    Chomsky, Noam, Poder y Terror. Reflexiones posteriores al 11/09/2001. Barcelona, RBA, 2003, 155 pp.Páginas 133-135José Francisco Tinao Martín-PeñaCobo Romero, Francisco, Conflicto rural y violencia política. Jaén, Universidad de Jaén-Universidad de Granada, 1998, 381 pp.Páginas 135-137José Luis Gutiérrez MolinaColacrai, Miryam (ed.), Relaciones Internacionales. Viejos temas, nuevos debates. Rosario, Centro de Estudios en Relaciones Internacionales de Rosario, 2001, 203 pp.Páginas 137-141David...

  15. Temporal evolution of adherents of the major religions in Mexico: Avrami model application-Kolgomorov solid training

    CERN Document Server

    Avilés, Mauricio González

    2013-01-01

    It applies a mathematical model of solid formation, the model of Avrami-Kolgomorov [Ausloos & Petroni, 2007] to model the time evolution of percentage of adherents of the major religions practiced in Mexico, adjusting the corresponding parameters with available records in the period from 1950 to 2000 [Molina-Hernandez, 2003; INEGI, 2005]. A comparison is made with the application of the model to global trends and concludes that Catholicism is in a marked disaggregation and trends of Christianity in Mexico are similar to global.

  16. Diferencias en el perfil psicológico y en la conducta alimentaria de madres de mujeres con y sin trastornos alimentarios /

    OpenAIRE

    Vazquez Velazquez, Veronica

    2012-01-01

     tesis que para obtener el grado de Doctorado en Psicología, presenta Verónica Vázquez Velázquez ; tutores principales de tesis Lucy María Reidl Martínez, Gilda Libia Gómez Pérez Mitré, Juan Pablo Méndez Blanco, Martha Kaufer Horwitz, Teresita de Jesús Saucedo Molina177 páginas : ilustracionesDoctorado en Psicología Universidad Nacional Autónoma de México, 2012 Programa de Posgrado en Psicología

  17. Pioneers in ozone research receive Nobel Prize in chemistry

    Science.gov (United States)

    The Royal Swedish Academy of Sciences has awarded its 1995 Nobel Prize in chemistry to three AGU members for their work in atmospheric chemistry, particularly concerning the formation and decomposition of ozone. Only one other Nobel prize has ever been awarded in the realm of atmospheric research. The honorees are professors Paul Crutzen of the Max-Planck Institute for Chemistry in Mainz, Germany; Mario Molina of the Massachusetts Institute of Technology; and F. Sherwood Rowland of the University of California, Irvine. The Academy credits the three with contributing to “our salvation from a global environmental problem that could have catastrophic consequences.”

  18. La traducción de culturemas en el ámbito del patrimonio cultural: análisis de folletos turísticos de la Región de Murcia

    OpenAIRE

    Soto Almela, Jorge

    2013-01-01

    La presencia de culturemas es una de las principales dificultades a las que ha de hacer frente el traductor de textos turísticos. Dichos elementos proceden de diversos ámbitos de una cultura y encuentran en el folleto turístico su nexo de unión. Uno de los ámbitos que ya desde Nida (1945) ha sido objeto de catalogaciones es el de la cultura material, también llamado ámbito del patrimonio cultural (Molina Martínez, 2001). Precisamente el objetivo de este trabajo consiste en...

  19. Generación de banco de propagación de bambú- guadua en zonas áridas de la costa peruana regado con distintos tipos de agua

    OpenAIRE

    Ruiz Rodríguez, Juan Gabriel

    2013-01-01

    El presente trabajo es un proyecto de investigación experimental que se ha realizado en la facultad de Ingeniería Agrícola de La Universidad Nacional Agraria La Molina, Lima, Perú. Se basa en el aprovechamiento de diferentes tipos de agua, a las que se les aplican diversas tecnologías sostenibles de tratamientos de agua, tal como sistemas de humedales construidos de flujo horizontal y reservorios. El reúso de estos cuerpos de agua se utiliza para la generación de un banco de pr...

  20. El suelo, un sistema organizado que sustenta la vida terrestre, una propuesta de aula para ciclo I

    OpenAIRE

    Ramírez Mora, Yenny Patricia

    2012-01-01

    El siguiente trabajo tiene como objetivo diseñar una propuesta de aula donde se integren conceptualmente la estructura, y los procesos: físicos, químicos, biológicos y sociales, que inciden en el desarrollo y protección del suelo, con el fin de lograr un aprendizaje significativo, el desarrollo de habilidades de pensamiento y una conciencia del cuidado de éste en los estudiantes del ciclo I, del colegio Gerardo Molina Ramírez IED. Se realizó una prueba diagnóstica con el fin de identificar la...

  1. Reseñas de Libros

    OpenAIRE

    Joaquín Piñeiro Blanca; Francisco de Paula Villatoro Sánchez; David Molina Rabadán; Daniel Alcalde Güelfo; Daniel Francisco Álvarez Espinosa; Mª del Rocío Piñeiro Álvarez; Manuel Baraja Escudero; José Joaquín Fernández Alles; Gema León Ravina

    2009-01-01

    Álvarez Rey, Leandro (Estudio preliminar, recopilación y edición), Diego Martínez Barrio. Palabra de republicano. Sevilla, Ayuntamiento de Sevilla-Instituto de la Cultura y las Artes, 2007, 1.046 pp.Páginas 177-179Joaquín Piñeiro BlancaBancalari Molina, Alejandro, Orbe romano e Imperio Global. La romanización desde Augusto a Caracalla. Santiago de Chile, Editorial Universitaria, 2007, 330 pp.Páginas 179-182Francisco de Paula Villatoro SánchezBernal-Meza, Raúl y Saha, Suranjit (comps.), Econom...

  2. Informe de calidad y datos de producción científica (2003-2009)en Nanociencia y Nanotecnología, Nuevos Materiales y Nuevos Procesos Industriales

    OpenAIRE

    de Moya-Anegón, Félix; Chinchilla-Rodríguez, Zaida; Corera-Álvarez, Elena; González-Molina, Antonio; López-Illescas, Carmen; Vargas-Quesada, Benjamín

    2012-01-01

    Moya-Anegón, F. (dir.), Chinchilla-Rodríguez, Z. (coord.), Corera-Álvarez, E., González-Molina, A., López-Illescas, C., Vargas-Quesada, B. Informe de calidad y datos de producción científica (2003-2009)en Nanociencia y Nanotecnología, Nuevos Materiales y Nuevos Procesos Industriales. Madrid: Fundación Española para la Ciencia y la Tecnología, 2012. NIPO: 720-12-041-0

  3. Estratigrafía del Pérmico y Triásico en el sector central de la rama castellana de la Cordillera Ibérica.

    Directory of Open Access Journals (Sweden)

    Pérez-Arlucea, M.

    1985-08-01

    Full Text Available The main Permian and Triassic sequence in Molina de Aragón and South Albarracín is established. More than 45 sections have been studied, analysing the lateral changes and establishing 16 lithoestratigraphic Units. Part of these 1ithoestraigraphic Units were originally established by Ramos (1979 in the Molina de Aragon area, but this study prove that they can be followed to our arca. .
    The description, main characteristics, lateral changes and extension of each lithoestratigraphic Units are established here. .
    The paleogeography of this area with a large high located in the half north of Albarracín Sierra, is discussed here. That high was related with the tectonic movements contemporaneous to sedimentation during Upper Permian and Triassic.

    Se establece la sucesión estratigráfica tipo del Pérmico y Triásico de la región comprendida entre Molina de Aragón y el sur de Albarracín. Sobro la base do más de 45 columnas estratigráficas levantadas y del análisis de las variaciones que presentan los distintos tramos litológicos de que se compone la serie, se establecen 16 unidades litoestratigráficas, Aunque una parte de estas unidades fueron definidas originalmente en otros sectores de la Cordillera Ibérica, el estudio realizado demuestra que son también válidas en este área. Es el caso de las unidades definidas para parte del Pérmico y para las facies Buntsandstein por Ramos (1979, al oeste de Molina de Aragón.
    Se describen y analizan las principales características de cada una de las unidades litoestratigráficas establecidas. así como sus variaciones laterales y extensión superficial. .
    Por último, se discuten las implicaciones paleogeográficas que tuvo la existencia de un importante umbral situado en la mitad norte de la Sierra de Albarracín, Y se relaciona su presencia con la actividad tectónica contemporánea de la sedimentación del Pérmico superior y del Triásico.

  4. Energía solar térmica y fotovoltaica aislada para pequeñas comunidades en Perú

    OpenAIRE

    Piriz Sagahon, Imanol Yalli Atahualpa

    2013-01-01

    El desarrollo de este proyecto se hizo gracias al apoyo económico del Centro de Cooperación al Desarrollo (CCD) y del Programa de Educación en Ciencia y Tecnología del Agua para la Población Infanto-juvenil de Perú PCIAECID (A1-035941-11). El apoyo en logística e instalaciones por parte del Departamento de Ordenamiento Territorial y Desarrollo Sostenible de la Universidad Nacional Agraria La Molina. El presente trabajo final de master esta orientado al diseño y la implement...

  5. John Punch, Scotist Holy War, and the Irish Catholic Revolutionary Tradition in the Seventeenth Century.

    Science.gov (United States)

    Campbell, Ian W

    2016-07-01

    During the 1640s, the Irish Franciscan theologian John Punch taught his theology students in Rome that war against Protestants was made just by their religion alone. Jesuits like Luis de Molina identified the holy war tradition in which Punch stood as a Scotist one, and insisted that the Scotists had confused the natural and supernatural spheres. Among Irishmen, Punch was unusual. The main Irish Catholic revolutionary tradition employed Jesuit and Thomist theory. They argued that the Stuarts had lost the right to rule Ireland for natural reasons, not supernatural ones; because the Stuarts were tyrants, not because they were Protestants. PMID:27477343

  6. Effects of Different Common Cucurbitaceae Grafting Rootstock on Growth, Development and Quality of Melon(Cucumis melo L.)%常见葫芦科作物砧木嫁接甜瓜其品质差异分析

    Institute of Scientific and Technical Information of China (English)

    王霞; 于高波; 盛云燕; 王洋洋; 廖佳宁

    2013-01-01

    [Objective]The aim was to analyze growth, development and quality of melon after grafting using common Cucurbitaceae grafting rootstock. [Method] The self-root seedling of Dongtian 02 was used as control. And pumpkin( Cucurbita moschata), big gourd[Lagenaria siceraria (Molina) Standl. var. gourda Ser. ] , ground melon[Lagenaria siceraria (Molina) Standl. var. clavata Ser. ], zucchini(Luffa cylin-drica) , and luffa[Benincasa hispida (Thunb. ) Cogn. var. chieh-qua How] were used for grafting to melon Dongtian 02. The experiment studied different rootstocks on the grafting survival rate, growth rate and fruit characteristics. [ Result] The results indicated that using luffa and zucchini as grafting rootstock were not suitable for the improvement of melon quality whereas gourd melon and pumpkin had the positive influence on performance. As grafting rootstock, big gourd has advantages and disadvantages. [ Conclusion] The study provides a theoretical basis for melon grafting cultivation development.%[目的]分析常见葫芦科作物砧木嫁接甜瓜(Cucumis melo L.)后甜瓜的生长发育及果实品质.[方法]以东甜02自根苗作为对照,进行以南瓜(Cucuita moschata)、大葫芦[Lagenaria siceraria(Molina)Standl.var.gourda Ser.]、瓠子[Lagenaria siceraria(Molina)Standl.var.clavata Ser.]、丝瓜(Luffa cylindrica)、节瓜[Benincasa hispida (Thunb.) Cogn.var.chieh-qua How]为砧木、东甜02为接穗的嫁接栽培比较试验,研究不同砧穗组合的嫁接成活率、植株生长速率和果实性状.[结果]以节瓜、丝瓜为砧木,不利于东甜02果实优良性状的表现,而以瓠子、南瓜为砧木,对东甜02有积极的影响,而以大葫芦为砧木,则利弊参半.[结论]该研究可为甜瓜嫁接栽培的发展提供理论依据.

  7. Experiences in WWTP of the effects of co-digestion of substrates on the biogas production; Experiencia en EDAR de la codigestion de sustratos sobre la produccion de biogas

    Energy Technology Data Exchange (ETDEWEB)

    Morenilla, J. J.; Bernacer, I.; Martinez, F.; Jardin, C.; Simon, P.; Ruiz, L.; Pradas, P.; Pastor, L.

    2010-07-01

    The use of co-digestion in wastewater treatment plants (WWTP) offers the possibility of treating sludge in conjunction with other substrates from different sources (agricultural or agroindustrial residues, etc.)to offset the balance of nutrients and moisture, increasing significantly biogas production of the process. Pobla de Farnals (Valencia) WWTP and Molina de Segura (Murcia) WWTP have introduced landfill leachate of municipal solid waste (MSW) in the anaerobic digestion, resulting in an increase of the biogas production. the additions started with punctual discharges of small amounts of leachate, and later, the frequency and volume of the discharges increased depending on the results. (Author) 17 refs.

  8. Informe de calidad y datos de producción científica (2003-2009) en Energía y Cambio Climático.

    OpenAIRE

    de Moya-Anegón, Félix; Chinchilla-Rodríguez, Zaida; Corera-Álvarez, Elena; González-Molina, Antonio; López-Illescas, Carmen; Vargas-Quesada, Benjamín

    2012-01-01

    Moya-Anegón, F. (dir.), Chinchilla-Rodríguez, Z. (coord.), Corera-Álvarez, E., González-Molina, A., López-Illescas, C., Vargas-Quesada, B. Informe de calidad y datos de producción científica (2003-2009) en Energía y Cambio Climático. Madrid: Fundación Española para la Ciencia y la Tecnología, 2012. NIPO: 720-12-041-0

  9. Understanding the crisis in Spain: An unhealthy political environment or a plain vanilla recession?

    OpenAIRE

    Winther, Jens

    2014-01-01

    The aim of my thesis is to examine the crisis in Spain and to consider whether an unhealthy political environment and the existence of an extractive political class can explain the crisis, or whether the situation in the country should be understood merely as a temporary economic crisis. To do so I investigate and discuss the causes to the crisis and test the assumptions and propositions in César Molinas’ theory of the political class in Spain. Molinas argues that the Spanish politicians do n...

  10. Ámbar en la Meseta Oriental durante el Bronce Final: yacimientos locales e importaciones bálticas

    Directory of Open Access Journals (Sweden)

    Luisa Cerdeño, M.ª

    2012-12-01

    Full Text Available This paper shows the results of the analysis done with two amber beads coming of the cemetery of Herrería II (Molina de Aragón, Guadalajara; it is dated in Late Bronze Age, preceding the Celtiberian period. The Baltic origin of the raw material has been confirmed by the analysis and this origin provides the evidence that continental cultural influences arrived to the meseta during mentioned period.

    En el presente trabajo se dan a conocer los resultados de los análisis de espectroscopía infrarroja realizados a dos cuentas de ámbar procedentes de la fase II de la necrópolis de Herrería (Molina de Aragón, Guadalajara, fechada a finales del Bronce Final y precedente inmediato de la primera fase celtibérica de dicho cementerio. Los resultados confirman la procedencia báltica de esta materia prima. Ello la convierte en una nueva evidencia +de la llegada de elementos continentales hasta la Meseta oriental, donde dicho substrato cultural desempeñó un papel importante en la gestación de los posteriores pueblos prerromanos.

  11. DO PENSAR HISTÓRICO Á NEGAÇÃO DO PÓS-TURISMO: Ensaio crítico sobre Pós-Turismo

    Directory of Open Access Journals (Sweden)

    João dos Santos Filho

    2011-12-01

    Full Text Available Resumo: O presente ensaio propõe uma análise crítica do livro O Pós-Turismo, do mexicano Sergio Molina. Inicialmente, destacamos os métodos funcionalista, estruturalista e do materialismo histórico como instrumentos capazes de interpretar a realidade turística, mostrando seus avanços e limites, para, em seguida, discutir o conceito de pós-modernidade e o surgimento do sufixo “pós”. Assim, poderemos iniciar a discussão em torno do pós-turismo e explicitar o método utilizado por Molina para criar tal conceito e demonstrar como o mesmo contribui para o empobrecimento científico e acadêmico da teoria do Turismo, evidenciando que tal conceito aplica-se como uma construção voltada para o mercado e não para o saber turístico. Palavras-chave: Turismo. Teoria do Turismo. Pós-Turismo. Funcionalismo. Neoliberalismo. 

  12. Inhibitory action of some essential oils and phytochemicals on the growth of various moulds isolated from foods

    Directory of Open Access Journals (Sweden)

    Evandro Leite de Souza

    2005-03-01

    Full Text Available The aim of this study was to determine the sensitivity profile of mould strains isolated from foods to some essential oils and phytochemicals. The assayed mould strains were: Fusarium spp., Rhizopus spp., Aspergillus flavus, A. niger and Penicillium spp. According to results, Lippia alba N.E. Brown, Peumus boldus Molina, Lippia microphylla Phil., Citrus limon Risso and Cymbopogon citratus Stapf. essential oil and the phytochemicals citral, eugenol and mircene showed prominent antimould activity. Among the products that evidenced antimould activity, citral and eugenol showed the lowest minimum inhibitory concentrations, which was 1% and 4%, respectively, for the most of the tested mould strains.O objetivo deste estudo foi determinar o perfil de sensibilidade de cepas de fungos filamentosos isolados de alimento a alguns óleos essenciais e fitoconstituintes. As cepas fúngicas utilizadas nos ensaios antimicrobianos foram: Fusarium spp., Rhizopus spp., Aspergillus flavus, A. niger e Penicillium spp. De acordo com os resultados obtidos, os óleos essenciais de L. Alba N.R. Brown, P. boldus Molina, L. microphylla Phill, C. limon Risso e C. citratus Stapf. e os fitoconstituintes citral, eugenol e mirceno mostraram destacada atividade antifúngica. Dentre os produtos que apresentaram atividade antifúngica, o citral e eugenol mostraram as menores CIM's, as quais foram 1% e 4%, respectivamente, para a maioria das cepas fúngicas testadas.

  13. La relación entre carácter y destino en la modernidad a través del mito de las sirenas: de Homero a Kafka y Joyce / The Relationship Between Character and Destiny in Modernity Through the Siren's Myth: from Homer to Kafka and Joyce

    Directory of Open Access Journals (Sweden)

    Jacobo de Camps Mora

    2016-02-01

    Full Text Available En este artículo se analiza la diferente articulación de la figura del héroe en la novela de Antonio Muñoz Molina, Beltenebros (1989, y en su adaptación cinematográfica, realizada por Pilar Miró (1991. Teniendo en cuenta el contexto histórico, y un origen cervantino en esa figura, se analizan las diferencias entre la técnica de presentación en la novela, el fluir de la conciencia, y las acciones y gestos en la adaptación, en la que dos escenas de baile resaltan por su contenido simbólico y carácter intertextual, que podemos relacionar con la cultura de masas. / In this article I review the hero´s characterization in Beltenebros, by Antonio Muñoz Molina (1989, and its filmic adaptation by Pilar Miró (1991. I review the historical contexts and the literary influence in that figure. We find important differences in the kind of hero, the presentation as a ”fluid” consciousness in the novel, and the contrast with the acting and gestures in the adaptation, where we find two dancing scenes relevants by its symbolic content and the inclusion of mass culture.

  14. 海南岛葫芦科蔬菜根结线虫种类鉴定%Species identification of the root-knot nematode on Cucurbitaceae vegetables in Hainan Is land

    Institute of Scientific and Technical Information of China (English)

    黄伟明; 陈绵才; 肖彤斌; 王会芳

    2011-01-01

    The root knot nematodes on Cucurbitaceae vegetables collected from 4 cities in Hainan Island were identified by using morphological characters, isozymes and mtDNA-PCR.Meloidogyne enterolobii were found in 5 samples, and it was a new record species on Lagenaria siceraria (Molina) Standl and Luffa cylindrica Roem.Its distribution in Wenchang and Lingshui was also reported.Miscegenation of M.enterolobii and M.incognita was observed on two samples.%运用比较形态学、同工酶和mtDNA-PCR对采自海南岛4个市县的葫芦科蔬菜根结线虫进行鉴定,结果发现5个种群均存在象耳豆根结线虫(Meloidogyne enterolobii).该种线虫是葫芦[Lagenaria siceraria(Molina)Standl]和丝瓜[Luffa cylindrica(Linn)Roem]上的新记录种,文昌和陵水属其首次被报道的分布地区.有2个样本表现为象耳豆根结线虫和南方根结线虫(M.incognita)的混合种群.

  15. Predation by Rattus norvegicus on a native small mammal in an Araucaria araucana forest of Neuquén, Argentina La depredación en pequeños mamíferos nativos por Rattus norvegicus en un bosque de Araucaria araucana en Neuquén, Argentina

    Directory of Open Access Journals (Sweden)

    JOHN D SHEPHERD

    2012-06-01

    Full Text Available Few previous studies document Rattus predation as a mechanism of impact on native small mammals. In a mixed Araucaria araucana (Molina Koch -Nothofagus forest in Parque Nacional Lanín in southwestern Neuquén Province, Argentina, we discovered the remains of long-clawed mice, Chelemys macronyx Thomas, cached in a burrow of Rattus norvegicus Berkenhout. We discuss this evidence of predation in light of Rattus biology and invasion ecology. Predation on native small mammals by invasive rats is easily underestimated or overlooked and deserves more careful attention.Pocos estudios anteriores documentan predación por Rattus como mecanismo de impacto sobre los mamíferos pequenos nativos. En un bosque mixto de Araucaria araucana (Molina Koch -Nothofagus de Parque Nacional Lanín al suroeste de la provincia del Neuquén, Argentina, encontramos los cadáveres del ratón topo grande, Chelemys macronyx Thomas, almacenados en una cueva de la rata noruega, Rattus norvegicus Berkenhout. Discutimos esta evidencia de la depredación a la luz de la biología de Rattus y la ecología de invasión. La depredación en pequenos mamíferos nativos por las ratas invasoras está fácilmente subestimada o pasada por alto. Este tema merece una atención más cuidadosa.

  16. 2 obras de Barba Corsini, España

    Directory of Open Access Journals (Sweden)

    Barba Corsini, F. J.

    1969-02-01

    Full Text Available Chalet at Vallvidrera This is a beautiful house, specially adapted to the requirements of the owners (a couple with three children and servants. It has three storeys, facing the mountains. Since the location of this house is close to Barcelona, on the southwest slopes of the Tibidabo mountain, it has been selected by many Barcelona families as their permanent residence. Apartments building at La Molina This building in the Alpine style is well and flexibly adapted to the mountain slope. It has eleven storeys within four separate blocks at different levels, which, together with the internal fitting and design, make this a most exclusive and singular mountain hotel.Chalet en Vallvidrera Se trata de una bonita residencia, perfectamente adaptada a sus usuarios —un matrimonio con tres hijos y servicio—, distribuida en tres plantas y mirando hacia la montaña. Dada la proximidad a Barcelona del pequeño pueblo, situado en la ladera suroeste del Tibidabo, muchos barceloneses lo han elegido para residencia permanente. Edificio de apartamentos en La Molina Esta construcción, de un gran carácter alpino, se adapta flexiblemente al ritmo de la pendiente, con sus once plantas retrocediendo según lo imponen las características de la montaña y con cuatro cuerpos de diferentes alturas; todo lo cual, unido al tratamiento interior y a todas las comodidades de que se dispone, confieren al conjunto una categoría exclusiva y singular.

  17. Evidence of hantavirus infection in wild rodents captured in a rural area of the state of São Paulo, Brazil Evidência de infecção por hantavírus em roedores silvestres capturados em uma área rural do estado de São Paulo, Brasil

    Directory of Open Access Journals (Sweden)

    Elba Regina S. de Lemos

    2004-06-01

    Full Text Available Hantaviruses are the etiological agents of the Hantavirus Cardio-Pulmonary Syndrome, a serious rodent-borne disease in Brazil. In order to investigate the occurrence of hantavirus infection in wild rodents, a survey was conducted in three different suburban areas of the municipality of Pedreira, State of São Paulo, Brazil. Of the 145 wild animals captured belonging to 12 different species identified by morphology and karyological analysis, 107 were rodents of the following species: Akodon montensis, Bolomys lasiurus, Calomys tener, Oligoryzomys nigripes, Oligoryzomys flavescens, and Myocastor coypus. Blood samples from these rodents were assayed for the presence of antibodies against hantavirus by IgG ELISA using Andes recombinant nucleocapsid antigen. Antibody reactive to Andes virus was found in two different species, O. nigripes and O. flavescens. These results indicate a potential risk for hantavirus transmission to humans in this area, where reservoir rodents are present in peridomestic settings.Hantavírus é o agente etiológico da síndrome cardio-pulmonar por hantavirus (SCPH, uma importante doença transmitida por roedores no Brasil. Com o objetivo de se conhecer a ocorrência de infecção por hantavírus em pequenos roedores silvestres, uma análise sorológica foi conduzida em três diferentes áreas do subúrbio da cidade de Pedreira, São Paulo. Dos 145 animais silvestres capturados, pertecentes a 12 diferentes espécies identificadas por morfologia e por análise cariológica, 107 eram roedores das seguintes espécies: Akodon montensis, Bolomys lasiurus, Calomys tener, Oligoryzomys nigripes, Oligoryzomys flavescens, e Myocastor coypus. Amostras de sangue desses roedores foram testadas para a presença de anticorpos IgG contra o antígeno do nucleocapsídeo do vírus Andes através do teste ELISA. Reatividade sorológica ao vírus Andes foi observada em duas espécies diferentes, O. nigripes and O. flavescens. Estes resultados

  18. Rodent diversity and habitat use in a protected area of Buenos Aires province, Argentina Diversidad y uso del hábitat por roedores en un área protegida de Buenos Aires, Argentina

    Directory of Open Access Journals (Sweden)

    Isabel E. Gómez-Villafañe

    2012-09-01

    Full Text Available Habitat use of rodents is associated to environmental variables, species requirements and biological interactions. The aim of this study was to analyse the macro and microhabitat use and spatial variation in the abundance of small wild rodents that inhabit Otamendi Natural Reserve, Argentina. We studied the rodent communities in 6 habitats: riparian forest, Celtis tala forest, lowland grassland, salt marsh and 2 highland grasslands. We captured a total of 153 individual of Scapteromys aquaticus, Akodon azarae, Oxymycterus rufus, Oligoryzomys flavescens, Deltamys kempi and O. nigripes, with a trapping effort of 3636 trap-nights. The species richness is maintained by the presence of different habitats that satisfy specific requirements from specialist and generalist species, using differentially the reserve and forming communities of different specific composition in each habitat. A differential macrohabitat use was observed by all species, and a certain level of selectivity at microhabitat scale was observed in individuals of 2 species. This study shows that the diversity of environments in the Otamendi Natural Reserve, which allows the maintenance of many wild species of small rodents; confirming the high ecological and conservational value of the reserves inside an urban region.El uso del habitat de los roedores está asociado a variables ambientales, requerimientos específicos e interacciones biológicas. El objetivo de este estudio fue analizar el uso del macro y microhábitat y la variación espacial en la abundancia de pequeños roedores que habitan la Reserva Natural Otamendi, Argentina. Estudiamos la comunidad de roedores en 6 ambientes: bosque ribereño, talares, pastizales bajos, pastizal salino y 2 pastizales altos. Capturamos 153 individuos de Scapteromys aquaticus, Akodon azarae, Oxymycterus rufus, Oligoryzomys flavescens, Deltamys kempi y O. nigripes, con un esfuerzo de 3 636 trampas-noche. La riqueza de especies se mantiene

  19. La presencia de Ixodes luciae en el noroeste argentino y nuevos huéspedes para Ixodes pararicinus y algunas especies de Amblyomma (Acari: Ixodidae Presence of Ixodes luciae in Argentina northwest and new hosts for Ixodes pararicinus and some species of Amblyomma (Acari: Ixodidae

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    Analía G. Autino

    2006-07-01

    Full Text Available El análisis de una colección de garrapatas de mamíferos del noroeste argentino, depositados en la Colección de Anexos de la Colección Mamíferos Lillo (CML de la Universidad Nacional de Tucumán, permitió ampliar el área de distribución de Ixodes luciae Sénevet, a las provincias de Salta y Tucumán e incrementar su rango de huéspedes al roedor sigmodontino Calomys callosus (Rengger y a los marsupiales de la familia Didelphidae Micoureus constantiae (Thomas, Thylamys cinderella Thomas y Thylamys venustus (Thomas. Se registró a C . callosus y Oligoryzomys destructor (Tschudi como nuevos huéspedes de Ixodes pararicinus Keirans & Clifford, y a los Carnivora Lycalopex gymnocercus (Fischer y Oncifelis geoffroyi (d´Orbigny & Gervais como nuevos huéspedes de Amblyomma neumanni Ribaga y Amblyomma parvum Aragão, respectivamente. Adicionalmente, se observó la infestación de Lutreolina crassicaudata (Desmarest (Didelphidae por I. luciae y la presencia de Amblyomma tigrinum Koch, sobre L. gymnocercus . Ninfas de Amblyomma sp . se obtuvieron de Akodon Meyen (Sigmodontinae.The analysis of a tick collection of mammals from northwestern Argentina deposited in the Annexes (ACML of Colección Mamíferos Lillo (CML National University of Tucumán, amplified the distribution of Ixodes luciae Sénevet, to Salta and Tucumán provinces and increased the host range to the sigmodontinae rodent Calomys callosus (Rengger and the Didelphidae Micoureus constantiae (Thomas, Thylamys cinderella Thomas and Thylamys venustus (Thomas. Calomys callosus and Oligoryzomys destructor (Tschudi were registered as new hosts of Ixodes pararicinus Keirans & Clifford, and the Carnivora Lycalopex gymnocercus (Fischer and Oncifelis geoffroyi (d´Orbigny & Gervais as new hosts of Amblyomma neumanni Ribaga, and Amblyomma parvum Aragão, respectively . Lutreolina crassicaudata (Desmarest (Didelphidae was also found infested with I. luciae while Amblyomma tigrinum Koch was

  20. Assemblage Data and Bone and Teeth Modifications as an Aid to Paleoenvironmental Interpretations of the Open-Air Pleistocene Site of Tighenif (Algeria)

    Science.gov (United States)

    Dauphin, Yannicke; Kowalski, Casimir; Denys, Christiane

    1994-11-01

    Variations in the proportions of the various groups of Rodentia collected from eight stratigraphic levels at Tighenif had previously been interpreted as representing environmental (climatic) changes. However, the processes involved in the formation of assemblages are still not well understood. Examination of fragmentation, crystallinity, and chemical composition of fossil bones and teeth, compared to recent samples, shows that a possible explanation for the variations in frequencies is the differential preservation of skeletal remains. Thus, the evaluation of postmortem effects is essential in determining the accuracy of the fossil record. The abundance and composition of remains are governed by the complex interaction of many factors. As indicated by actualistic studies, direct deductions from fauna lists must be avoided as much as possible.

  1. Small terrestrial mammals living along streams acting as natural landscape barriers

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    Bohdal Tomáš

    2016-06-01

    Full Text Available Riparian stands along streams are important landscape elements – biocorridors, allowing the dispersal of many small terrestrial mammals. Streams are, however, also barriers limiting dispersal, which leads to isolation and population-genetic changes. Communities of small terrestrial mammals (Eulipotyphla, Rodentia were studied in 2004 to 2006 on five watercourses of varying widths in Central European cultural landscape situated in South Bohemia (Czech Republic. In total, 547 individuals from 10 species were captured by the Capture-Mark-Recapture method (CMR. Yellow-necked mouse (Apodemus flavicollis and bank voles (Myodes glareolus were eu-dominant species at all locations. Species diversity and equitability rose with the degree of the barrier – proportional to the width of the stream.

  2. El Aragoniense Medio y Superior en el Suroeste de Madrid: Los nuevos yacimientos de Micromamíferos del Mioceno Medio de Villaviciosa de Odón y Leganés

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    Sesé, C.

    2014-06-01

    Full Text Available This paper discloses two new sites in the southwestern area of Madrid, Villaviciosa de Odón and Leganés, which have provided two rich micromammals associations of different ages. The micromammal association of the Villaviciosa de Odón site determined in this work is composed by the following taxa: Lagomorpha: Lagopsis peñai; Erinaceomorpha: Galerix cf. exilis; Soricomorpha: Miosorex cf. grivensis; Rodentia: Atlantoxerus sp., Microdyromys sp., Armantomys tricristatus, Megacricetodon collongensis and Democricetodon sp. This association, mainly by the evolutionary stage of Megacricetodon collongensis, corresponds to the E local biozone after Daams & Freudenthal (1988a from the end of the Middle Aragonian which is correlated with the end of the MN 5 Unit of Mein (1975. The micromammal association of the Leganés site consists of the following taxa: Lagomorpha: Lagopsis verus; Erinaceomorpha: Galerix cf. exilis; Rodentia: Heteroxerus cf. rubricati, Armantomys sp., Megacricetodon collongensis-crusafonti and cf. Democricetodon sp. Mainly by the evolutionary stage of Megacricetodon collongensis-crusafonti this association corresponds to the G1 local biozone after Daams et al. (1999 a y b which is correlated with the MN 6 Unit of Mein (1975. It is the only site known in Madrid of this age. Both micromammals associations suggest an open environment dominated by hard vegetation of steppe kind, and a dry and relatively warm climate.En este trabajo se dan a conocer dos nuevos yacimientos de la zona suroeste de Madrid, Villaviciosa de Odón y Leganés, que han proporcionado dos ricas asociaciones de micromamíferos de edades diferentes. La asociación de micromamíferos del yacimiento de Villaviciosa de Odón determinada en este trabajo está compuesta por los siguientes taxones: Lagomorpha: Lagopsis peñai; Erinaceomorpha: Galerix cf. exilis; Soricomorpha: Miosorex cf. grivensis; Rodentia: Atlantoxerus sp., Microdyromys sp., Armantomys tricristatus

  3. Further description of Aspidodera raillieti (Nematoda: Aspidoderidae) from Didelphis marsupialis (Mammalia: Didelphidae) by light and scanning electron microscopy.

    Science.gov (United States)

    Chagas-Moutinho, V A; Oliveira-Menezes, A; Cárdenas, M Q; Lanfredi, R M

    2007-10-01

    Nematodes of the family Aspidoderidae (Nematoda: Heterakoidea) Freitas 1956 are widely distributed from Americas. The species of the genus Aspidodera Railliet and Henry 1912 are parasites of mammals of the orders Edentata, Marsupialia, and Rodentia. In the present work, Aspidodera raillieti (L. Travassos, Mem Inst Oswaldo Cruz 5(3):271-318, 1913), collected from the large intestine of Didelphis marsupialis (Mammalia: Didelphidae) from Valle del Cauca, Colombia, is redescribed. The association of light and scanning electron microscopy (SEM) allowed a detailed analysis of the morphology and ultrastructure of this nematode. Some taxonomic features, such as cephalic region, topography of the cuticle, sucker, spicules, posterior end of males, localization of vulva, the anus, and posterior end of females were observed. Important structures such as amphid, details of cephalic region, phasmid, and number and localization of caudal papillae are documented by SEM, for the first time adding characters to identify this species. Colombia is a new geographical record for A. raillieti.

  4. Further description of Aspidodera raillieti (Nematoda: Aspidoderidae) from Didelphis marsupialis (Mammalia: Didelphidae) by light and scanning electron microscopy.

    Science.gov (United States)

    Chagas-Moutinho, V A; Oliveira-Menezes, A; Cárdenas, M Q; Lanfredi, R M

    2007-10-01

    Nematodes of the family Aspidoderidae (Nematoda: Heterakoidea) Freitas 1956 are widely distributed from Americas. The species of the genus Aspidodera Railliet and Henry 1912 are parasites of mammals of the orders Edentata, Marsupialia, and Rodentia. In the present work, Aspidodera raillieti (L. Travassos, Mem Inst Oswaldo Cruz 5(3):271-318, 1913), collected from the large intestine of Didelphis marsupialis (Mammalia: Didelphidae) from Valle del Cauca, Colombia, is redescribed. The association of light and scanning electron microscopy (SEM) allowed a detailed analysis of the morphology and ultrastructure of this nematode. Some taxonomic features, such as cephalic region, topography of the cuticle, sucker, spicules, posterior end of males, localization of vulva, the anus, and posterior end of females were observed. Important structures such as amphid, details of cephalic region, phasmid, and number and localization of caudal papillae are documented by SEM, for the first time adding characters to identify this species. Colombia is a new geographical record for A. raillieti. PMID:17622560

  5. The parasitism of Ixodes luciae (Acari: Ixodidae on marsupials and rodents in Peruvian Amazon O parasitismo do Ixodes luciae (Acari: ixodidae em marsupiais e em roedores na Amazônia Peruana

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    María Mónica Díaz

    2009-01-01

    Full Text Available In this work the infestation with I. luciae on Didelphimorphia and Rodentia in different environments of Peruvian Amazon was studied. Didelphimorphia was represented by the family Didelphidae. Specimens belonging to Caluromys lanatus, Didelphis marsupialis, Marmosops sp.2, Metachirus nudicaudatus, Philander andersoni and Philander opossum were infested with adults I. luciae and one Micoureus sp. was infested with larvae. In Rodentia, the infestation with I. luciae nymphs was restricted to Hylaeamys perenensis, Hylaeamys yunganus and Oligoryzomys microtis, while one Oecomys bicolor (all Cricetidae was infested with larvae of this species. The few larvae were found on rodents captured in primary forest. The only significant difference (P No presente trabalho, infestações por Ixodes luciae em Didelphimorphia e Rodentia em diferentes ambientes da Amazônia peruana foram estudadas. Didelphimorphia foi representada pela família Didelphidae. Espécimes pertencentes a Caluromys lanatus, Didelphis marsupialis, Marmosops sp., Metachirus nudicaudatus, Philander andersoni e Philander opossum foram encontrados infestadas por adultos de I. luciae; um Micoureus sp. foi encontrado infestado por larvas. Em Rodentia, a infestação por ninfas de I. luciae estiveram restritas a Hylaeamys perenensis, Hylaeamys yunganus e Oligoryzomys microtis, enquanto que um Oecomys bicolor (todos Cricetidae esteve infestado por larvas de I. luciae. As poucas larvas foram encontradas em roedores capturados na floresta primária. A única diferença significante (P < 0.05 na prevalência de carrapatos adultos em Didelphimorphia foi entre P. andersoni e M. nudicaudatus (distribuição chi-quadrado. A distribuição de carrapatos adultos foi significativamente diferente em P. andersoni quando comparado com M. nudicaudatus, P. opossum e D. marsupialis (teste Kruskal-Wallis. Nenhum efeito significante do mês ou ambiente foi observado em relação à infestação por carrapato

  6. Vitamin A (retinol and retinyl esters), alpha-tocopherol and lipid levels in plasma of captive wild mammals and birds.

    Science.gov (United States)

    Schweigert, F J; Uehlein-Harrell, S; von Hegel, G; Wiesner, H

    1991-02-01

    Vitamin A (retinol and retinyl esters), vitamin E and lipids were determined in a wide variety of wild mammals and birds held in captivity. In mammals plasma levels of vitamin A were generally below 500 ng/ml and those of vitamin E were highly variable (0.1-2 micrograms/ml). In primates, vitamin E levels were 3 to 8 micrograms/ml. Whereas in Marsupialia, Chiroptera, primates, Rodentia, Proboscidea, Sirenia, Perissodactyla and Artiodactyla only retinol was found, retinyl esters (basically retinol palmitate/oleate) represented 10 to 50% of the total plasma vitamin A in some birds of the order Ciconiiformes and Falconiformes. Retinol levels in birds were higher compared to mammals (500-2,000 ng/ml). The same was true for lipids as well as for vitamin E levels (1-26 micrograms/ml) in the plasma of birds. PMID:1905864

  7. A soluble class I molecule analogous to mouse Q10 in the horse and related species.

    Science.gov (United States)

    Lew, A M; Valas, R B; Maloy, W L; Coligan, J E

    1986-01-01

    Horse serum is shown to contain a soluble class I molecule analogous to the secreted Q10 molecule in the mouse. This molecule has several similarities to the recently described mouse Q10 molecule: it is smaller than membrane-bound equine class I molecules; it occurs in a high molecular mass complex of 200-300 kd in serum; and the serum levels of the equine molecule are similar to that of the Q10 molecule (about 30 micrograms/ml). A soluble molecule is also detected in the sera of species related to the horse; it has in fact been found in all the wild members of the order Perissodactyla so far tested. However, it was not detected in the serum of members of the orders Carnivora, Sirenia, Proboscidea, Artiodactyla, and Primates that were tested, nor in the serum of members of the order Rodentia other than in that of the genus Mus. PMID:3519445

  8. ANTIOXIDANT ENZYMES IN MAMMALS NATURALLY ADAPTED TO OXYGEN DEFICIENCY

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    Antonova Ekaterina Petrovna

    2013-03-01

    Full Text Available The activity of the key antioxidant enzymes, superoxide dismutase (SOD and catalase, were studied in the liver, kidneys and heart of 8 mammalian species from 2 Orders – Insectivora and Rodentia. Some species-specific differences were found – the activities of the enzymes in the organs considerably differed even in the taxonomically close species. The specific profile of antioxidant enzymes in the organism of birch mouse appears to be due to the occurance of hibernation in this animal. In the heart of semi-aquatic Eurasian water shrew and European water vole, an increase of the catalase activity was noted. The activity of SOD and catalase in the same organ can differ significantly even in taxonomically close species of studied mammals, and it was caused, first of all, by the specificity of their ecological features and adaptation to hypoxia.

  9. The fauna of small mammals in the vicinity of Temerin, The Vojvodina providence

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    Popović Ester J.

    2006-01-01

    Full Text Available The samples collected by traps in the vicinity of Temerin and the analysis of pellets of the long-eared owl (Asia otus and the barn owl (Tyto alba served as a basis for the determination of 409 individuals of small mammals of the orders Insectivora and Rodentia. A total of 13 species from the families Soricidae (6, Muridae (4 and Arvi-colidae (3 was recorded. The representatives of the species Apodemus sylvaticus prevailed in the sample obtained by traps while the pellet analysis showed the domination of Micro-tus arvalis in the owl diet. The presence of five of the total of thirteen species found by the pellet analysis was confirmed by means of traps.

  10. Complete mitochondrial genome sequence of the Chinese scrub vole (Neodon irene).

    Science.gov (United States)

    Fan, Longqing; Fan, Zhenxin; Yue, Hao; Zhang, Xiuyue; Liu, Yang; Sun, Zhiyu; Liu, Shaoying; Yue, Bisong

    2011-06-01

    The Chinese scrub vole (Neodon irene) belongs to the subfamily Arvicolinae, which is restricted to mountain areas at high altitudes (2800-4000). In this study, we sequenced the complete mitochondrial genome of N. irene. It was determined to be 16,367 bases. The nucleotide sequence data of 12 heavy-strand protein-coding genes of N. irene and other 22 rodents were used for phylogenetic analysis. Bayesian inference (BI) and maximum likelihood (ML) were used. Both the BI and ML trees demonstrated that Microtus rossiaemeridionalis and Microtus kikuchii did not cluster together with each other. On the contrary, M. rossiaemeridionalis showed close relationship with N. irene. In the present study, only one sequence from Neodon and two sequences from Microtus were included in the phylogenetic analysis which should contribute to the unusual relationship. Therefore, in order to better understand the phylogenetic relationship within Rodentia, more rodents' complete mitochondrial genomes are required.

  11. Ocelot (Leopardus pardalis) predation on primates in Caratinga Biological Station, Southeast Brazil.

    Science.gov (United States)

    Bianchi, Rita De Cassia; Mendes, Sérgio Lucena

    2007-10-01

    This study demonstrates that ocelots (Leopardus pardalis) extensively use primates as a food resource at the Caratinga Biological Station (CBS) in Southeast Brazil. Analysis of 60 fecal samples collected over 4 years revealed predation upon the brown howler monkey (Alouatta guariba), the muriqui (Brachyteles hypoxanthus), and the brown capuchin monkey (Cebus apella). The most frequent items found in the fecal samples analyzed were Calomys (n=16) and non-identified Aves (n=15), followed by A. guariba (n=12). Although Rodentia was the most common group consumed (n=52) Primates were found in 27% of total fecal samples and were the third most consumed group in relation to the total items. Particularly, predation of A. guariba by ocelots (20% of the total fecal samples) was not an isolated event; our results showed that this species was preyed on across several months. Predation on primates was far higher at CBS than at other sites where comparable studies have been carried out. PMID:17330310

  12. Small terrestrial mammals of Albania: annotated list and distribution

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    Ferdinand Bego

    2009-02-01

    Full Text Available Abstract: Abstract We report for Albania new records of small terrestrial mammals (Erinaceomorpha, Soricomorpha, Rodentia and outline previously published data. Twenty-four species (one hedgehog, six soricomorhps and 17 rodents have been collected in 161 localities surveyed throughout the country. Nine species (Neomys anomalus, Crocidura leucodon, Talpa stankovici, Dryomys nitedula, Muscardinus avellanarius, Micromys minutus, Mus macedonicus, Myodes glareolus, and Microtus thomasi are recorded for Albania for the first time. The present list is far from being complete and presence of a further 11 species has to be confirmed. Riassunto I Micromammiferi dell'Albania: status e distribuzione Viene presentato un quadro della distribuzione dei micromammiferi in Albania, evidenziando le specie di recente scoperta così come alcuni dati già pubblicati. L'esame di 161 località distribuite sull'intero territorio nazionale ha permesso di raccogliere informazioni sulla presenza di 24 specie di micromammiferi (1 Erinaceomorpha, 6 Soricomorpha e 17 Rodentia. Nove specie  (Neomys anomalus, Crocidura leucodon, Talpa stankovici, Dryomys nitedula, Muscardinus avellanarius, Micromys minutus, Mus macedonicus, Myodes glareolus, e Microtus thomasi vengono segnalate per la prima volta. L'elenco qui presentato non può essere considerato definitivo. Ulteriori ricerche potrebbero accertare la presenza di altre 11 specie.

  13. The role of wild mammals in the maintenance of Rift Valley fever virus.

    Science.gov (United States)

    Olive, Marie-Marie; Goodman, Steven M; Reynes, Jean-Marc

    2012-04-01

    Rift Valley fever virus (RVFV) is a zoonotic arbovirus affecting primarily domestic ruminants and humans. Numerous vector species are known or implicated in the transmission of RVFV. The role of mammals in the maintenance of RVFV, and the existence of a wild mammal reservoir in the epidemiologic cycle of RVFV, remain largely unknown. Our objective is to present a detailed review of studies undertaken on RVFV, often associated with wild mammals, with the aim of focusing future research on potential reservoirs of the virus. Natural and experimental infections related to RVFV in several mammalian orders, including Artiodactyla, Chiroptera, Rodentia, Primata (nonhuman), Perissodactyla, Carnivora, Proboscidea, Erinaceomorpha, and Lagomorpha, are reviewed; the first four orders have received the greatest attention. The possible role of wild ruminants, especially African buffalo (Syncerus caffer), is also discussed. Conflicting results have been published concerning rodents but, based on the literature, the likely candidate species include the African genera Arvicanthis and Micaelamys and the widely introduced roof rat (Rattus rattus). Members of the orders Chiroptera and Rodentia should receive greater attention associated with new research programs. For the other orders mentioned above, few data are available. We are unaware of any investigation concerning the orders Afrosoricida and Soricomorpha, which are represented in the geographic area of RVFV and can be abundant. As a first step to resolve the question of wild mammals as a reservoir of RVFV, serologic and virologic surveys should be promoted during epizootic periods to document infected wild animals and, in the case of positive results, extended to interepidemic periods to explore the role of wild animals as possible reservoirs.

  14. A Checklist of the Mammals of small Italian islands

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    Francesco Angelici

    2009-11-01

    Full Text Available Abstract Present knowledge on mammals of small Italian islands consists mainly of episodic records. In this paper we collect all available information about the distribution of wild mammals on 47 small Italian islands. A total of 37-38 species was found, including: 1 Erinaceomorpha, 4 Soricomorpha, 16-17 Chiroptera, 3 Lagomorpha, 7 Rodentia, 2 Carnivora and 4 Artiodactyla. The subspecific level has been identified whenever possible. The mammal fauna of the Isle of Elba (Tuscan Archipelago is the richest, with 24 species, while the most common species are Rattus rattus present on 47 islands Oryctolagus cuniculus (34, and Mus musculus (33. With the exception of Crocidura sicula, the current mammal fauna on small Italian islands originated from introductions.
    Riassunto Checklist dei mammiferi delle piccole isole italiane Lo stato attuale delle conoscenze sui mammiferi delle piccole isole del territorio italiano è frutto, perlopiù, di segnalazioni episodiche. Abbiamo raccolto le informazioni disponibili riguardo i mammiferi selvatici. Sono state prese in esame 47 isole, sulle quali è stata segnalata la presenza di un totale di 37-38 specie così ripartite: 1 Erinaceomorpha, 4 Soricomorpha, 16-17 Chiroptera, 3 Lagomorpha, 7 Rodentia, 2 Carnivora e 4 Artiodactyla. Quando possibile è stato identificato anche il livello subspecifico. In base ai dati finora disponibili, la teriofauna dell’Isola d’Elba (Arcipelago Toscano risulta quella più diversificata (24 specie, mentre le specie più diffuse sono Rattus rattus, presente su 47 isole, Oryctolagus cuniculus (34 e Mus musculus (33. Con l’eccezione di Crocidura sicula, i popolamenti attuali di mammiferi selvatici nelle piccole isole italiane sono originati da introduzioni operate dall’uomo.

  15. Factores de riesgo asociadas a la enfermedad Chagas en comunidades rurales en Lara, Venezuela

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    Zully Briceño

    2014-06-01

    Full Text Available La reinfestación por vectores secundarios es un problema emergente para la transmisión de la enfermedad de Chagas. Objetivo: Realizar un análisis comparativo para determinar los factores de riesgo asociados a la seropositividad en humanos. Materiales y Métodos: Estudio ecoentomológico y seroepidemiológico realizado en dos comunidades del Estado Lara, infestadas por Triatoma maculata o Panstrongylus geniculatus. Resultados: Guariquito (bosque húmedo tropical templado intervenido para actividad agrícola mostró una seroprevalencia (SP canina del 33,33 % y humana del 6,81 % asociada a: menores de 40 años, vector en vivienda anterior, comer animales de caza, migración rural, reconocimiento y contacto con el vector, siendo factores protectores conocimiento del vector y haber vivido en ranchos; infestación 20,45 %, colonización 0 % e infección 18,75 %; ninfas capturadas en cuevas de Xenarthra, los cuales se encontraron infectados (20 %, al igual que Rodentias (25 %. Cauderales (región semidesértica: SP humana del 11,56 % asociada a: mayores de 40 años, vector en vivienda anterior tipo rancho, comer animales de caza, migración rural, reconocimiento y contacto con el vector, siendo factor protector presencia de caninos en la vivienda, los cuales fueron seronegativos; infestación 5,51 %, colonización 0 % e infección-vivienda 0 %; ninfas y Chiropteras no infectadas fueron capturadas en Cactáceas. Conclusión: Panstrongylus geniculatus es responsable de la transmisión reciente en regiones intervenidas de bosque tropical húmedo y con reservorios de los géneros Xenarthra y Rodentia; Tm tiene capacidad vectorial limitada debido a bajos índices de infección producto de sus fuentes de alimento.

  16. The influence of habitat fragmentation on helminth communities in rodent populations from a Brazilian Mountain Atlantic Forest.

    Science.gov (United States)

    Cardoso, T S; Simões, R O; Luque, J L F; Maldonado, A; Gentile, R

    2016-07-01

    The influence of habitat structure on helminth communities of three sigomdontinae rodent species (Akodon cursor, A. montensis and Oligoryzomys nigripes) was investigated in forest fragments within an agricultural landscape in south-eastern Brazil. This is a pionner study correlating the occurrence of helminth species of rodent hosts with microhabitat characteristics. Rodents were collected from 12 fragments and in a continuous conserved area. Up to 13 nematode, three cestode and two trematode species were identified, and habitat fragmentation was found to have more influence on the helminth composition of O. nigripes compared to the other two rodent species. Fragmentation appeared to limit the development of some helminths' life cycles, e.g. with some species such as Trichofreitasia lenti, Protospirura numidica, Cysticercus fasciolaris and Avellaria sp., occurring mostly in areas with less anthropic impact. However, fragmentation did not seem to affect the life cycles of other dominant helminths, such as the trematode Canaania obesa, the nematodes Stilestrongylus lanfrediae, S. eta and S. aculeata, and the cestode Rodentolepis akodontis. The helminth community structure followed a nested pattern of distribution in A. montensis and O. nigripes. Stilestrongylus lanfrediae seemed to be more associated with dense understorey, C. obesa with open canopy and dense understorey, and Guerrerostrongylus zetta with organic matter on the ground. Their presence in each area may be explained by aspects of their life cycles that take place in the external environment outside the host. PMID:26206199

  17. Amblyomma yucumense n. sp. (Acari: Ixodidae), a Parasite of Wild Mammals in Southern Brazil.

    Science.gov (United States)

    Krawczak, Felipe S; Martins, Thiago F; Oliveira, Caroline S; Binder, Lina C; Costa, Francisco B; Nunes, Pablo H; Gregori, Fábio; Labruna, Marcelo B

    2015-01-01

    During 2013-2014, adult ticks were collected on the vegetation and subadult ticks were collected from small mammals [Didelphis aurita Wied-Neuwied, Sooretamys angouya (Fischer), Euryoryzomys russatus (Wagner), Akodon montensis Thomas, Oxymycterus judex Thomas] in an Atlantic rainforest reserve in southern Brazil. Analyses of the external morphology of the adult ticks revealed that they represent a new species, Amblyomma yucumense n. sp. Partial 16S rRNA sequences generated from males, females, and nymphs were identical to each other and closest (95% identity) to corresponding sequences of Amblyomma dubitatum Neumann. A. yucumense is morphologically and genetically closest related to A. dubitatum. Dorsally, male of these species can be separated by major longitudinal pale orange stripes associated with a pseudoscutum indicated by a pale stripe in A. yucumense, in contrast to pale creamy longitudinal stripes and absence of pseudoscutum in A. dubitatum. Ventrally, male coxal I spurs are separated by a space narrower than external spur width in A. yucumense, and wider than external spur width in A. dubitatum. Females of the two species can be separated by coxal I spurs, longer in A. yucumense than in A. dubitatum. In addition, the adult capitulum and ventral idiosoma of A. yucumense are generally dark brown colored, while A. dubitatum is yellowish or light brown colored. The nymph of A. yucumense differs from A. dubitatum by the scutal cervical groove length, slightly shorter in the former species. Currently, A. yucumense is restricted to southern Brazil. PMID:26336277

  18. Hantavirus Reservoirs: Current Status with an Emphasis on Data from Brazil

    Directory of Open Access Journals (Sweden)

    Renata Carvalho de Oliveira

    2014-04-01

    Full Text Available Since the recognition of hantavirus as the agent responsible for haemorrhagic fever in Eurasia in the 1970s and, 20 years later, the descovery of hantavirus pulmonary syndrome in the Americas, the genus Hantavirus has been continually described throughout the World in a variety of wild animals. The diversity of wild animals infected with hantaviruses has only recently come into focus as a result of expanded wildlife studies. The known reservoirs are more than 80, belonging to 51 species of rodents, 7 bats (order Chiroptera and 20 shrews and moles (order Soricomorpha. More than 80genetically related viruses have been classified within Hantavirus genus; 25 recognized as human pathogens responsible for a large spectrum of diseases in the Old and New World. In Brazil, where the diversity of mammals and especially rodents is considered one of the largest in the world, 9 hantavirus genotypes have been identified in 12 rodent species belonging to the genus Akodon, Calomys, Holochilus, Oligoryzomys, Oxymycterus, Necromys and Rattus. Considering the increasing number of animals that have been implicated as reservoirs of different hantaviruses, the understanding of this diversity is important for evaluating the risk of distinct hantavirus species as human pathogens.

  19. A field comparison of two capture-mark-recapture estimators of small mammal populations

    Directory of Open Access Journals (Sweden)

    Rosana Gentile

    1999-01-01

    Full Text Available The results obtained by two estimators of population sizes, MNKA and Mh, were compared for four species of small mammmals - Didelphis aurita Wied, 1826, Philander frenata (Olfers, 1818, Nectomys squamipes (Brants, 1827 and Akodon cursor (Winge, 1887 - during a long-term population study. The MNKA estimator consistently underestimated the population sizes in relation to Mh. On the other, the probabilistic estimator Mh, which reduces bias through the jackknife technique, could not be used in all cases as its assumptions were not always met. Correction factors between the estimates obtained by the two methods were calculated for the last three species, for which catchability did not vary significantly in time and that presented positive correlation between the estimates by the two models. In order to combine the adavantages of both methods for small mammal population studies, is suggested the use of probabilistic closed population models and to calculate a correction factor based in another model which allow estimates in all cases, and which provides correlated estimates. This correction factors should be used in those cases where the probabilistic model cannot be used.

  20. Infection by trypanosomes in marsupials and rodents associated with human dwellings in Ecuador.

    Science.gov (United States)

    Pinto, C Miguel; Ocaña-Mayorga, Sofía; Lascano, Mauricio S; Grijalva, Mario J

    2006-12-01

    Small mammals trapped in domestic and peridomestic environments of rural Ecuador were screened for trypanosome infection by direct microscopy and hemoculture. Identification of species of trypanosomes was then performed by morphological characteristics and by polymerase chain reaction (PCR) assays. Of 194 animals collected, 15 were positive for infection (7.73%). Eight (4.12%) were infected with Trypanosoma cruzi (1 of 33 Didelphis marsupialis; 7 of 61 Rattus rattus). Eleven R. rattus (18.03%) harbored T. lewisi, 5 of which presented mixed infections with T. cruzi. Additionally, 1 of 3 Oryzomys xanthaeolus was infected with T. rangeli. No trypanosome infection was detected in Philander opossum (n = 1), Mus musculus (n = 79), Rattus norvegicus (n = 8), Akodon orophilus (n = 4), Sigmodon peruanus (n = 3), or Proechimys decumanus (n = 2). Many of the isolates belong to T. cruzi, the causative agent of Chagas disease, and R. rattus had the highest prevalence. Because of its abundance in the study areas, this species is considered an important reservoir for Chagas disease. This is the first report of T. lewisi and T. rangeli in Ecuador. This study is also the first to describe natural mixed infections of T. cruzi-T. lewisi. PMID:17304802

  1. Two new species of Nippostrongylinae (Nematoda: Trichostrongylina: Heligmonellidae from the grey leaf-eared mouse Graomys griseoflavus (Sigmodontinae in Argentina

    Directory of Open Access Journals (Sweden)

    Digiani M.C.

    2003-03-01

    Full Text Available Two new species of Nippostrongylinae, Hassalstrongylus puntanus n. sp., and Stilestrongylus franciscanus n. sp. are described from the intestine of the grey leaf-eared mouse Graomys griseoflavus (Waterhouse, 1837 (Sigmodontinae from the Province of San Luis, Argentina. Hassalstrongylus puntanus n. sp. is distinguished from the most closely related species H. dollfusi (Diaz-Ungria, 1963, a parasite of Mus musculus from Venezuela by longer rays 2, shorter rays 4, proximal half of the dorsal ray non-enlarged and a non-retractile female tail. Stilestrongylus franciscanus n. sp. is distinguished from the most closely related species S. flavescens Sutton & Durette-Desset, 1991, a parasite of Oryzomys flavescens from Argentina, by rays 2 and 3 diverging separately from common trunk of rays 2 to 6, and by right ray 3 arising from this trunk more distally than ray 6. Stilestrongylus azarai Durette-Desset & Sutton, 1985, a parasite of Akodon azarae from Buenos Aires, Argentina, was also found parasitizing G. griseoflavus, representing new host and locality records. Some additional morphological data for this species are also provided.

  2. Habitat associations of small mammals in southern Brazil and use of regurgitated pellets of birds of prey for inventorying a local fauna.

    Science.gov (United States)

    Scheibler, D R; Christoff, A U

    2007-11-01

    We inventoried terrestrial small mammals in an agricultural area in southern Brazil by using trapping and prey consumed by Barn Owls (Tyto alba) and White-tailed Kites (Elanus leucurus). Small mammals were trapped in three habitat types: corn fields, uncultivated fields ("capoeiras"), and native forest fragments. A total of 1,975 small mammal specimens were trapped, another 2,062 identified from the diet of Barn Owls, and 2,066 from the diet of White-tailed Kites. Both trapping and prey in the predators' diet yielded 18 small mammal species: three marsupials (Didelphis albiventris, Gracilinanus agilis, and Monodelphis dimidiata) and 15 rodents (Akodon paranaensis, Bruceppatersonius iheringi, Calomys sp., Cavia aperea, Euryzygomatomys spinosus, Holochilus brasiliensis, Mus musculus, Necromys lasiurus, Nectomys squamipes, Oligoryzomys nigripes, Oryzomys angouya, Oxymycterus sp.1, Oxymycterus sp.2, Rattus norvegicus, and Rattus rattus (Linnaeus, 1758)). The greatest richness was found in the uncultivated habitat. We concluded that the three methods studied for inventorying small mammals (prey in the diet of Barn Owls, White-tailed Kites, and trapping) were complementary, since together, rather than separately, they produced a better picture of local richness. PMID:18278312

  3. Trypanosoma cruzi TcI and TcII transmission among wild carnivores, small mammals and dogs in a conservation unit and surrounding areas, Brazil.

    Science.gov (United States)

    Rocha, Fabiana Lopes; Roque, André Luiz Rodrigues; Arrais, Ricardo Corassa; Santos, Jean Pierre; Lima, Valdirene dos Santos; Xavier, Samanta Cristina das Chagas; Cordeir-Estrela, Pedro; D'Andrea, Paulo Sérgio; Jansen, Ana Maria

    2013-02-01

    Aiming to better understand the ecological aspects of Trypanosoma cruzi transmission cycles, wild carnivores, small mammals and dogs were examined for T. cruzi infection in the Serra da Canastra National Park region, Brazil. Isolates were genotyped using mini-exon gene and PCR-RFLP (1f8 and H3) genomic targets. Trypanosoma cruzi transmission was well established in the area and occurred in both wild and peridomestic environments. Dog seroprevalence was 29·4% (63/214) and TcI and TcII genotypes, besides mixed infections were observed. Only TcI was detected in wild mammals. Marsupials displayed lower relative abundance, but a high prevalence of positive haemocultures (4/22), whereas rodents displayed positive haemocultures (9/113) mainly in the abundant Akodon montensis and Cerradomys subflavus species. The felid Leopardus pardalis was the only carnivore to display positive haemoculture and was captured in the same region where the small mammal prevalence of T. cruzi infection was high. Two canid species, Chrysocyon brachyurus and Cerdocyon thous, were serologically positive for T. cruzi infection (4/8 and 8/39, respectively), probably related to their capacity to exploit different ecological niches. Herein, dog infection not only signals T. cruzi transmission but also the genotypes present. Distinct transmission strategies of the T. cruzi genotypes are discussed. PMID:23062278

  4. Arthropod and filarioid parasites associated with wild rodents in the northeast marshes of Buenos Aires, Argentina

    Directory of Open Access Journals (Sweden)

    Marcela Lareschi

    2003-07-01

    Full Text Available During 1995, 16 species of arthropods and 2 species of filarioids, totaling 1 287 specimens were collected from 64 wild rodents captured in the Hudson Natural Reserve, Buenos Aires, Argentina. Infestation parameters and indexes were analyzed. Host specific richness was S = 6, diversity H = 1.48, and relative density RDI = 40%. High values of parasite species richness and diversity were found on Oligoryzomys delticola (S = 9; H = 1.40, Oxymycterus rufus (S = 9; H = 1.37, and Oligoryzomys flavescens (S = 9; H = 1.28, followed by Scapteromys aquaticus (S = 6; H = 0.17, and Akodon azarae (S = 4; H = 1.20. Deltamys kempi was infested only by Androlaelaps rotundus. O. delticola and O. flavescens showed the highest similarity index (O = 74.19%, followed by O. flavescens with S. aquaticus, as a result of historical processes and shared microhabitats. Considering arthropods-filarioids associations, significant affinity was observed in Litomosoides bonaerensis with Hoplopleura travassosi, Laelaps paulistanensis, and Gigantolaelaps wolffsohni.

  5. Niche suitability affects development: skull asymmetry increases in less suitable areas.

    Directory of Open Access Journals (Sweden)

    Renan Maestri

    Full Text Available For conservation purposes, it is important to take into account the suitability of a species to particular habitats; this information may predict the long-term survival of a species. In this sense, morphological measures of developmental stress, such as fluctuating asymmetry, can be proxies for an individual's performance in different regions. In this study, we conducted tests to determine whether areas with different levels of suitability for a species (generated by ecological niche models were congruent with morphological markers that reflect environmental stress and morphological variance. We generated a Maxent niche model and compared the suitability assessments of several areas with the skull morphology data (fluctuating asymmetry and morphological disparity of populations of the Atlantic forest endemic to Brazil rodent Akodon cursor. Our analyses showed a significant negative relationship between suitability levels and fluctuating asymmetry levels, which indicates that in less suitable areas, the individuals experience numerous disturbances during skull ontogeny. We have not found an association between morphological variance and environmental suitability. As expected, these results suggest that in environments with a lower suitability, developmental stress is increased. Such information is helpful in the understanding of the species evolution and in the selection of priority areas for the conservation of species.

  6. Evaluation of a Three-Dimensional Chemical Transport Model (PMCAMx) in the Mexico City Metropolitan Area

    Science.gov (United States)

    Tsimpidi, A. P.; Karydis, V. A.; Zavala, M.; Lei, W.; Molina, L. T.; Pandis, S. N.

    2007-05-01

    Atmospheric aerosols have adverse effects on human health, contribute to the visibility reduction and influence the energy balance of the planet. A three-dimensional chemical transport model (PMCAMx) (Gaydos et al., 2007) is used to simulate the particular matter (PM) mass composition distribution in the Mexico City Metropolitan Area (MCMA). PMCAMx uses the framework of CAMx (ENVIRON, 2002) modelling the processes of horizontal and vertical advection, horizontal and vertical dispersion, wet and dry deposition, and gas-phase chemistry. In addition to the above, PMCAMx includes three detailed aerosol modules: inorganic aerosol growth (Gaydos et al., 2003; Koo et al., 2003a), aqueous-phase chemistry (Fahey and Pandis, 2001), and secondary organic aerosol formation and growth (Koo et al., 2004). The aerosol thermodynamic model ISORROPIA has been improved as it now simulates explicitly the chemistry of Ca, Mg, and K salts and is linked to PMCAMx. The hybrid approach (Koo et al., 2003b) for modelling aerosol dynamics is applied in order to accurately simulate the inorganic components in coarse mode. This approach assumes that the smallest particles are in equilibrium while the condensation/evaporation equation is solved for the larger ones. The new CMU organic aerosol model, which is based on the splitting of the organic aerosol volatility range in discrete bins, is also used. The model predictions are evaluated against the PM and vapour concentration measurements from the MCMA-2003 Campaign (Molina et al., 2007). References Gaydos, T., Pinder, R., Koo, B., Fahey, Κ., Yarwood, G., and Pandis, S. N., (2007). Development and application of a three-dimensional Chemical Transport Model, PMCAMx. Atmospheric Environment, in press. ENVIRON (2002). User's guide to the comprehensive air quality model with extensions (CAMx). Version 3.10. Report prepared by ENVIRON International corporation, Novato, CA Gaydos, T., Koo, B., and Pandis, S. N., (2003). Development and application of

  7. Consideraciones taxonómicas en especies de Senecio de Argentina Taxonomic considerations on Argentine species of Senecio

    Directory of Open Access Journals (Sweden)

    Roberto D. Tortosa

    2010-12-01

    Full Text Available Se incluyen algunas especies de Senecio de Argentina, reconocidas hasta el presente como especies válidas, en la sinonimia de otras: S. francisci Phil. en S. polygaloides Phil.; S. gymnocaulos Phil. en S. kingii Hook. f.; S. molinae Phil. en S. glaber Less.; S. mustersii Speg. y su var. dentatus Cabrera en S. subumbellatus Phil. Senecio microcephalus Phil. y su var. angustifolius Cabrera son consideradas una variedad de S. subumbellatus y S. schreiteri Cabrera una variedad de S. leucostachys Baker. No se acepta la validez de las variedades Senecio gilliesii Hook. et Arn. var. dasycarpus Cabrera, S. glaber Less. var. pratensis (Phil. Cabrera, S. gnidioides Phil. var. gilvus (Phil. Cabrera, S. kingii Hook. f. var. paradoxus (Albov ex Kurtz Cabrera, S. leucomallus A. Gray var. incisus A. Gray, S. linariifolius Poepp. ex DC. var. heliophytoides (Phil. Reiche y var. subtomentosus Cabrera y de la forma S. perezii Cabrera fo. integerrimus Cabrera.

  8. Rastros digitais, discriminação e recrutamento em Alta Normandia : A situação das pessoas com limitação funcional psíquica

    OpenAIRE

    Sabaayon, Hadi

    2014-01-01

    1. Michel ARNAUD : Professeur en SIC à l’Université Paris Ouest Nanterre La Défense, rapporteur.2. Joël COLLOC : Professeur en Informatique à l’Université du Havre.3. Béatrice GALINON-MÉLÉNEC : Professeur en SIC à l’Université du Havre, co-directrice de thèse.4. Hervé LE CROSNIER : Maître de Conférences, HDR en SIC à l’Université de Caen, rapporteur.5. Louise MERZEAU, Maître de Conférences, HDR en SIC à l’Université Paris Ouest Nanterre La Défense, co-directrice de thèse.6. Michèle MOLINA : P...

  9. Esquema de evaporación flexible para la producción integrada de azúcar y alcohol

    OpenAIRE

    Yannery González Fundora

    2008-01-01

    La investigación responde a la necesidad de implementar un nuevo esquema de evaporación en la fábrica de azúcar de la Empresa Azucarera "Héctor Molina", con el objetivo de crear una industria flexible que se ajuste a las variaciones del flujo en proceso debido al desvío de jugo diluido a la destilería (entre el 20 y 70 %), con la menor inversión posible y utilizando los equipos existentes. Para el cálculo de los balances de masa y energía se utilizó la simulación con la herramienta DAFLEX (Di...

  10. Preparation and characterisation of quillaja saponin with less heterogeneity than Quil-A

    DEFF Research Database (Denmark)

    Kamstrup, Søren; San Martin, R.; Doberti, A.;

    2000-01-01

    Immunisation against pathogens remains one of the most effective ways of preventing or reducing losses due to infectious diseases in animal husbandry. When inactivated vaccines are used, adjuvants are most often required to obtain satisfactory immune responses. One such type of adjuvant is saponin...... derived from the bark of Quillaja saponaria Molina, a tree of the rose family. A few different commercial sources exist, but due to the structural complexity and heterogeneity of these saponin preparations, it has been difficult to establish exactly which components are responsible for the adjuvant...... activity. By carefully selecting the bark source, live have succeeded in preparing a much less heterogeneous preparation of quillaja saponin. In this report we describe the preparation, in terms of structural complexity, hemolytic activity, adjuvant activity, and its ability to form ISCOM matrix. This new...

  11. Web 2.0 usage among New Zealand learners: Findings on gender difference

    Directory of Open Access Journals (Sweden)

    Ning Wei

    Full Text Available In this paper, gender differences in Web 2.0 usage by postgraduate students in New Zealand are presented. 84 postgraduate students drawn from two different convenience samples were surveyed to discover the extent to which they used and were familiar with Web 2.0 applications. According to Cuadrado-García, Ruiz-Molina and Montoro-Pons (2010, p. 367, \\"men and women differ in their interaction with technology\\". In this study, gender differences in the use of different Web 2.0 applications and technologies have been considered. Whilst findings from this study are limited by the way in which the populations were sampled, the sample size and having a majority of international students with English as a second language, it is interesting to note that there were only minor differences between the ways in which male and female postgraduate students use Web 2.0 applications.

  12. Experimental study of periodic flow effects on spanwise vortex

    Science.gov (United States)

    Garcia Molina, Cruz Daniel; Lopez Sanchez, Erick Javier; Ruiz Chavarria, Gerardo; Medina Ovando, Abraham

    2014-11-01

    We present an experimental study about the spanwise vortex produced in a flow going out of a channel in shallow waters. This vortex travels in front of the dipole. The velocity field measurement was done using the PIV technique, and DPIVsoft (https://www.irphe.fr/ ~meunier/) was used for data processing. In this case the flow has a periodic forcing to simulate ocean tides. The experiment was conducted in a channel with variable width and the measurements were made using three different values of the aspect ratio width-depth. We present results of the position, circulation of this spanwise vortex and the flow inversion effect. The change of flow direction modify the intensity of the vortex, but it does not destroy it. The vertical components of the velocity field contributes particle transport. G. Ruiz Chavarria, E. J. Lopez Sanchez and C. D. Garcia Molina acknowledge DGAPA-UNAM by support under project IN 116312 (Vorticidad y ondas no lineales en fluidos).

  13. How do we see art: an eye-tracker study

    Directory of Open Access Journals (Sweden)

    Rodrigo eQuian Quiroga

    2011-09-01

    Full Text Available We describe the pattern of fixations of subjects looking at figurative and abstract paintings from different artists (Molina, Mondrian, Rembrandt, della Francesca and at modified versions in which different aspects of these art pieces were altered with simple digital manipulations. We show that the fixations of the subjects followed some general common principles (e.g. being attracted to saliency regions but with a large variability for the figurative paintings, according to the subject’s personal appreciation and knowledge. In particular, we found different gazing patterns depending on whether the subject saw the original or the modified version of the painting first. We conclude that the study of gazing patterns obtained by using the eye-tracker technology give a useful approach to quantify how subjects observe art.

  14. Ingenieros españoles en la Ilustración (El Real Gabinete de Máquinas)

    OpenAIRE

    González, Ignacio

    2004-01-01

    La segunda mitad del siglo XVII fue una época fértil para el progreso de las diversas ramas de la tecnología y, de una manera m"DVpartiC..ldlar,para la ingeniería mecánica y la civil. Una de las innovaciones más notables de este período fue la creación del «Real Gabinete de Máquinas», en cuya génesis, organización y dirección tuvieron un papel destacado dos de los más grandes personajes de la Ilustración tardía, el ingeniero civil Agustín de Betancourt y Molina (Puerto de la Cr...

  15. Reseñas de Libros

    OpenAIRE

    Diego Iturriaga Barco; David Molina Rabadán; Gema González Ferrera; Jesús Rodríguez González; Antonio Muñoz de Arenillas Valdés; Alejandro Estrella González; Francisco de Paula Villatoro Sánchez; Miguel Ángel González Clarós; Joaquín Piñeiro Blanca; José Antonio Ruiz Gil

    2009-01-01

    Beck, Ulrich, Sobre el terrorismo y la guerra. Barcelona, Paidós, 2002, 62 pp.Páginas 187-188Diego Iturriaga BarcoBurleigh, Michael, Sangre y rabia. Una historia cultural del terrorismo. Madrid, Taurus, 2008, 736 pp.Páginas 188-190David Molina RabadánColectivo IOÉ, Barómetro Social de España. Análisis del período 1994-2006. Madrid, Traficantes de Sueños y Centro de Investigación para la Paz (CIP)-Ecosocial, 2008, 469 pp.Páginas 190-192Gema González FerreraDavis, Mike, Planeta de Ciudades Mise...

  16. 湖北部分瓠瓜种质资源初步研究及利用%Research and Utilization of Hubei L.siceraria Cultivars

    Institute of Scientific and Technical Information of China (English)

    李开银; 石伟平; 胡宇舟; 高道先

    2003-01-01

    @@ 瓠瓜[Lagenaria siceraria (Molina) Stardl.]亦称夜开花、蒲瓜,为葫芦科一年生攀缘草本植物,依形状分为长瓠、短瓠、圆瓠(葫芦),依熟性分为早、中、晚熟.瓠瓜在湖北省栽培面积较大,种质资源丰富,仅三峡地区已收入国家种质资源库的瓠瓜地方品种就达11份[1],为选育瓠瓜一代杂种及为西瓜作砧木提供了广泛的遗传基因[2,3].

  17. A QTAIM topological analysis of the P3HT-PCBM dimer

    Science.gov (United States)

    Rodríguez, Juan I.; Matta, Chérif F.; Uribe, Emilbus A.; Götz, Andreas W.; Castillo-Alvarado, F. L.; Molina-Brito, Bertha

    2016-01-01

    In order to cast some light onto the nature of the chemical bonding between a 8-unit oligomer of the poly(3-hexylthiophene) (P3HT) and the fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) in the two stables isomers reported recently [I. Gutiérrez-González, B. Molina-Brito, A.W. Götz, F.L. Castillo-Alvarado, J.I. Rodríguez, Chem. Phys. Lett. 612, 234 (2014)], we have performed a Bader's quantum theory of atoms in molecules (QTAIM) analysis. According to QTAIM, no covalent bonds are formed between P3HT and PCBM, and hydrogen and stacking interactions account for about 90% and 10% of the total number of bonds between P3HT and PCBM, respectively.

  18. Impacto económico del sector cerámico en San José de Cúcuta (Colombia

    Directory of Open Access Journals (Sweden)

    Johanna Milena Mogrovejo Andrade

    2015-02-01

    Full Text Available Esta investigación tuvo como finalidad determinar el impacto económico de las empresas del sector cerámico en la ciudad de San José Cúcuta (Colombia en el periodo 2008-2011. Se utilizó como instrumento un cuestionario estructurado aplicado a los empresarios del sector. Igualmente, se efectuaron entrevistas a directivos de organizaciones gremiales. El impacto económico se analizó siguiendo la metodología propuesta por Soto y Bergoeing (1998, Arbeláez y Sandoval (2006 y Molina, Coronado y Rivera (2008. Se concluye que este sector, en el periodo estudiado, presentó gran impacto económico, en particular en lo relativo al nivel de empleo, el aporte en impuestos al municipio, el consumo intermedio y el valor agregado.

  19. Fluid injection induced seismicity reveals a NE dipping fault in the southeastern sector of the High Agri Valley (southern Italy)

    Science.gov (United States)

    Stabile, T. A.; Giocoli, A.; Perrone, A.; Piscitelli, S.; Lapenna, V.

    2014-08-01

    On 2 June 2006 the wastewater produced during the oil and gas field exploitation in High Agri Valley (southern Italy) started to be managed by disposal through pumping the fluids back into the subsurface at the Costa Molina 2 (CM2) injection well, located in the southeastern sector of the valley. The onset of microearthquakes (Ml ≤ 2) after 4 days at about 1.3 km SW of CM2 well suggests fluid injection induced seismicity by the diffusion of pore pressure. Moreover, the space-time evolution of 196 high-resolution relocated events reveals a previously unmapped NE dipping fault. We investigate the physical processes related to the fluid injection induced seismicity and delineate the previously unmapped fault by jointly analyzing seismicity data, geological observations, fluid injection data, the stratigraphic log of the CM2 well, and the electrical resistivity tomography survey carried out in the study area.

  20. Antimonumentos: trabalho de memória e de resistência

    Directory of Open Access Journals (Sweden)

    Márcio Seligmann-Silva

    2016-04-01

    Full Text Available Resumo Este ensaio apresenta uma reflexão sobre o fenômeno dos "antimonumentos" que surgiram no final do século XX como uma forma de lidar, pelo viés das artes, com a violência de Estado, como nos casos do nazismo e das ditaduras latino-americanas. Este texto faz inicialmente uma retomada da mnemotécnica, ou seja, da antiga "arte da memória", que tem como seu pai mítico Simônides de Ceos, para em seguida apresentar a cena moderna da "arte da memória" sob a rubrica dos antimonumentos. O trabalho apresenta e discute obras de, entre outros artistas, Jochen Gerz, Horst Hoheisel, Andreas Knitz, Marcelo Brodsky e Fulvia Molina.

  1. Raceways-based production of algal crude oil

    Energy Technology Data Exchange (ETDEWEB)

    Chisti, Yusuf [Massey Univ., Palmerston North (New Zealand). School of Engineering

    2013-11-01

    Raceway ponds, or 'high-rate algal ponds', of various configurations have been used to treat wastewater since the 1950s. They are also known as Oswald ponds after their inventor W. J. Oswald. Large-scale outdoor culture of microalgae and cyanobacteria in raceways is well established (Terry and Raymond 1985; Oswald 1988; Borowitzka and Borowitzka 1989; Becker 1994; Lee 1997; Molina Grima 1999; Pulz 2001; Borowitzka 2005; Spolaore et al. 2006). Raceway culture is used commercially in the United States, Thailand, China, Israel and elsewhere, mostly to produce algae for relatively high-value applications. This chapter is focused on raceways typically used in the production of algal biomass and not in the treatment of wastewater. The engineering design, operation and performance characteristics of raceways are discussed. The biomass productivity of the raceways is assessed in relation to limits imposed by algal biology. The economics of algal oil production in raceways are discussed. (orig.)

  2. Integration of Communication Analysis and the OO-Method: Rules for the manual derivation of the Conceptual Model

    CERN Document Server

    España, Sergio; Pastor, Óscar; Ruiz, Marcela

    2011-01-01

    Enterprise information systems can be developed following a model-driven paradigm. This way, models that represent the organisational work practice are used to produce models that represent the information system. Current software development methods are starting to provide guidelines for the construction of conceptual models, taking as input requirements models. This paper proposes the integration of two methods: Communication Analysis (a communication-oriented requirements engineering method [Espa\\~na, Gonz\\'alez et al. 2009]) and the OO-Method (a model-driven object-oriented software development method [Pastor and Molina 2007]). For this purpose, a systematic technique for deriving OO-Method Conceptual Models from business process and requirements models is proposed. The business process specifications (which include message structures) are processed in order to obtain static and dynamic views of the computerised information system. Then, using the OLIVANOVA framework, software source code can be generated...

  3. La agricultura nahua en el siglo XVI

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    Jácome Alba González

    2001-01-01

    Full Text Available Alonso de Molina’s Vocabulary is the main historical source followed by the author of this article in order to understand the Nahua agriculture at the end of the XVI century. There are also other historical sources utilized by Alba González to compare the information about types of soils, climate, vegetation, agricultural technicques and the technology associated with it and about irrigation. The article has a broad information about agricultural managements and the uses of plants -mainly corn- utilized in the agricultural labour, which was basic in the life of the Nahuas in Central Mexico. It has several tables with the data obtained from the historical sources which permit to understand the richness of this economic activity. This article is important for agricultural, ecological and historical studies and the information it presents is valuable.

  4. A new species of Phrixotrichus (Araneae, Theraphosidae from southwestern Argentina and new distributional data for P. vulpinus

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    Nelson Ferretti

    2015-06-01

    Full Text Available ABSTRACT A new species of Phrixotrichus Simon, 1889, P. pucara sp. nov., is described and illustrated based on a male from Pucará river, Neuquén province, Argentina. Male can be distinguished from all other species of the genus by the presence of a long strong spine on inner face of prolateral branch of tibial apophysis; also, it differs from P. scrofa (Molina, 1788 and P. vulpinus (Karsch, 1880 by a serrated prolateral keel of the male palpal bulb. Male resembles P. jara Perafán & Pérez-Miles, 2014 but can be distinguished by the uniform color on dorsal cephalothorax and by the palpal organ morphology being wider on the bulb base and embolus shorter and thicker, with the tip of embolus not so directed retrolaterally and prolateral keel bearing a serrated edge with three teeth. Additionally, P. vulpinus is reported for the first time for Argentina along with new distributional data.

  5. Revolución y contrarrevolución en el Caribe: España, Trujillo y Fidel Castro en 1959

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    de Paz Sánchez, Manuel

    1999-08-01

    Full Text Available Soon after the Cuban Revolution it was found out that its own survival depended mostly on the dissemination of its message in the Caribbean area, and specially on the need to export its revolutionary experience to those territories which, as it was the case with the Dominican Republic, wished to get free from the last dictators in America, the most famous among the latter being Rafael Leónidas Trujillo Molina. Spain's external position was peculiar in this regard. Within the general framework of its Latin American policy, aiming at the maintenance of diplomatic links in the area, Madrid endeavoured to keep good relationships both with Trujillo 's Dominican Republic and with revolutionary Cuba.

    La Revolución Cubana no tardó en descubrir que una de las claves fundamentales para su propia supervivencia, que estaba ligada, asimismo, a su ideario de insurrección continental era la expansión de su mensaje en la propia zona del Caribe y, en concreto, la necesidad de exportar sus prácticas insurgentes hacia aquellos territorios que, como la República Dominicana, estaban deseando liberarse del yugo de los últimos dictadores de América, entre los que alcanzaba la cúspide de la impopularidad Rafael Leónidas Trujillo Molina. La posición exterior de España, en tales circunstancias, no dejaba de ser peculiar. En el contexto general de su política hacia América Latina que ansiaba mantener los vínculos diplomáticos, al margen de contingencias más o menos coyunturales, Madrid hizo todo lo posible por entenderse tanto con la República Dominicana del dictador Trujillo como con la Cuba revolucionaria del rebelde Castro.

  6. Estudio hermenéutico de la izquierda colombiana como alternativa política de partido

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    Emma Doris López

    2013-07-01

    Full Text Available ResumenEl presente estudio hermenéutico parte de los argumentosplanteados en el seminario electivo de comportamientopolítico, en el Doctorado de Ciencias Políticas,orientado por el doctor José Enrique Molina.La interpretación política de la izquierda en Colombiaha incidido a través de la historia como una fuerzaque, a pesar de su fragmentación, hoy se está consolidandocomo una alternativa de partido que abarca el manejode los comportamientos electorales desde lo psicológicoy lo sociológico.Este artículo está fundamentado en Pérez (2006 y enlos planteamientos de Torcal y Mainwaring. Se trató deinterpretar la posición de la izquierda como política alternativapara el mejoramiento de los estados sociales enlos países de América Latina.Palabras clave: Hermenéutica, Política de izquierda,Comportamiento electoral. AbstractThis hermeneutic study of the arguments raised inthe seminar elective political behavior, the Ph.D. in PoliticalScience, guided by Dr. José Enrique Molina.The political interpretation of the left in Colombiahas affected through history as a power that, despite itsfragmentation, today is emerging as an alternative partythat covers the management of electoral behavior fromthe psychological and the sociological.This paper it is based on Pérez (2006 and approachesTorcal and Mainwaring. He tried to interpret the positionof the left as an alternative for improving social conditionsin Latin American politics.Keywords: Hermeneutics, Leftist politics, ElectoralbehaviorCómo

  7. La democracia en el Perú: una terca voluntad

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    Carolina ROMERO

    2009-11-01

    Full Text Available RESUMEN: La construcción de la democracia en el Perú es una vieja tarea que se realiza, aunque imperceptiblemente, lenta y tercamente tanto en la cultura política de los nuevos ciudadanos como en la organización política de la sociedad. El presente artículo es un ensayo sobre la aventura democrática en el primer lustro del siglo XXI yendo a las últimas décadas del siglo XX en el Perú, en las que la institucionalidad democrática adquiere nueva legitimidad, para entender las dificultades que los actores políticos encuentran y que se deben tomar en cuenta para hablar de la calidad de la democracia, en la línea que el artículo de Levine y Molina (2007 nos propone.ABSTRACT: The construction of democracy in Peru is a long standing challenge that has advanced slowly and stubbornly, if imperceptibly at time, in both the political culture of the citizens and the political organization of society. This article analyzes the «democratic adventure» in Peru in the first years of the 21st century in the context of the last two decades of the 20th, when democratic institutionalization achieved a new level of legitimacy, to identify the challenges to democracy that political actors have confronted. These elements will help analyze the quality of democracy along the lines proposed in the work of Levine and Molina (2007.

  8. Desmitificar el mito de la Revolución mexicana

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    Marie-José Hanaï

    2011-06-01

    Full Text Available A partir de la posrevolución mexicana, varios discursos han emprendido una mitificación de la Revolución, pretendiendo unificar a la nación mediante imágenes, héroes y fórmulas, o intentando establecer los rasgos de la mexicanidad. En la segunda mitad del siglo XX, historiadores, antropólogos y escritores de ficción escogen la vía de la exploración y discusión del mito para reevaluar su peso y significación en la identidad mexicana y la cultura nacional. La representación de la Revolución en la novela participa de esa revisión e interrogación del mito. Proponemos considerar dos novelas publicadas en los años 80, Gringo viejo, de Carlos Fuentes, y La familia vino del norte, de Silvia Molina, para comparar las estrategias de discusión del mito revolucionario, entre la re-mitificación y la humanización.From the Mexican post-revolution, several speeches have undertaken a mythification of the Revolution, claiming to unify the nation by means of images, heroes and formulae, or trying to establish the features of the Mexican identity. In the second half of the 20th century, historians, anthropologists and fiction writers choose the route of the exploration and discussion of the myth to re-evaluate its importance and meaning in the Mexican identity and the national culture. The representation of the Revolution in the novel takes part of this review and interrogation of the myth. We propose to consider two novels published in the 80s, Gringo viejo, of Carlos Fuentes, and La familia vino del norte, of Silvia Molina, to compare the strategies of discussion of the revolutionary myth, between re-mythification and humanization.

  9. Base litoestratigráfica de las facies Buntsandstein y Muschelkalk en la rama aragonesa de la Cordillera Ibérica (zona norte

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    Arribas, J.

    1985-04-01

    Full Text Available In order to complete the information about the Triassic in the Iberian Range, a description of Buntsandstein and Muschelkalk facies lithostratigraphy of the aragonesa branch has been made. In this way we have informaly defined six lithostratigraphic units. The presence of two Triassic lithotypes (Iberian Triassic and Mediterranean Triassic in the study area allows us to analyse the lithologic relationships between both of them. Finally. a first attempt of correlation between the informal units mentioned above and the Ramos' (1979 units of the Molina de Aragón area has been made, This correlation permits us to relate the Triassic of both branches in the Iberian Range.

    En este trabajo se realiza una descripción de la litoestratigrafía de las facies Buntsandstein y Muschelkalk en la rama aragonesa de la Cordillera Ibérica, con el fin de cubrir un vacío bibliográfico de gran importancia en el contexto global del Trias de la Cordillera Ibérica. Se han definido informalmente cuatro unidades litoestratigráficas correspondientes a las facies Buntsandstein y dos a las facies Muschelkalk. La presencia de dos litotipos triásicos (mediterráneo e ibérico en la zona de estudio, permite analizar en detalle las relaciones litológicas entre ellos. Por último, se realiza un intento de correlación entre las unidades definidas informalmente en este trabajo con las definidas por Ramos (1979 en las proximidades de Molina de Aragón, con el fin de relacionar el Trías de las dos ramas de la Cordillera Ibérica.

  10. Mamíferos carnívoros e sua relação com a diversidade de hábitats no Parque Nacional dos Aparados da Serra, sul do Brasil Carnivore mammals and their relation with habitat diversity in Aparados da Serra National Park, southern Brazil

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    Maria de Fátima M. dos Santos

    2004-09-01

    Full Text Available A survey of carnivore mammals was accomplished in Aparados da Serra National Park from February 1998 to March 2000. The park has 10,250 ha and is considered a biodiversity core area of the Atlantic Forest Biosphere Reserve in the Rio Grande do Sul State, Brazil. The landscape is characterized by relatively well preserved relicts of Araucaria angustifolia (Bertol. Kuntze forest, grasslands and Atlantic Forest, which have contributed for the survival of endangered carnivore mammals. The National Park was divided in a grid of 16 km² cells using a 1:50,000 scale map. The animals were recorded using indirect methods, by identifying signs (scats, tracks and direct observation in 2.5 km long and 5 m wide transects, with 10 replicates in each grid cell. Interviews with local people were also used to confirm the animal presence. A total of 13 species was recorded: Procyon cancrivorus (Cuvier, 1798, Pseudalopex gymnocercus (G. Fischer, 1814, Leopardus pardalis (Linnaeus, 1758 and Cerdocyon thous (Linnaeus, 1766 were the most frequent species registered. Nasua nasua (Linnaeus 1766, Herpailurus yaguarondi (Lacépède, 1809, Chrysocyon brachyurus (Illiger, 1815, Eira barbara (Linnaeus, 1758, Leopardus sp., Puma concolor (Linnaeus, 1771, Galictis cuja (Molina, 1782, Conepatus chinga (Molina, 1892 and Lontra longicaudis (Olfers, 1818 showed lower frequencies. The Park presented areas with significant differences (Mantel Test, P< 0.05 in species richness and composition related to habitat classes. Areas with high habitat richness presented high species richness. The Araucaria forest was the habitat that presented the higher carnivore richness. The border areas of the Park are influenced by several environmental degradation factors that could be affecting the distribution of carnivores.

  11. Enzootic transmission of Trypanosoma cruzi and T. rangeli in the Federal District of Brazil Transmissão enzoótica de Trypanosoma cruzi e T. rangeli no Distrito Federal, Brasil

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    Rodrigo Gurgel-Gonçalves

    2004-04-01

    Full Text Available The Federal District of Brazil (DF lies within the Cerrado biome, where open shrubland (savannas is interspersed with riverside gallery forests and permanent swamps (veredas. Trypanosoma cruzi-infected native triatomines occur in the area, but the enzootic transmission of trypanosomatids remains poorly characterized. A parasitological survey involving sylvatic triatomines (166 Rhodnius neglectus collected from Mauritia flexuosa palms and small mammals (98 marsupials and 70 rodents, totaling 18 species was conducted in 18 sites (mainly gallery forests and veredas of the DF. Parasites were isolated, morphologically identified, and characterized by PCR of nuclear (mini-exon gene and kinetoplast DNA (kDNA. Six R. neglectus, seven Didelphis albiventris and one Akodon cursor were infected by trypanosomes; wild reservoir infection is documented for the first time in the DF. kDNA PCR detected T. cruzi in five R. neglectus and mini-exon gene PCR revealed T. cruzi I in isolates from D. albiventris. Parasites infecting one bug yielded T. rangeli KP1+ kDNA amplicons. In spite of the occurrence of T. cruzi-infected D. albiventris (an important wild and peridomestic reservoir and R. neglectus (a secondary vector displaying synanthropic behavior, a low-risk of human Chagas disease transmission could be expected in the DF, considering the low prevalence infection recorded in this work. The detection of T. rangeli KP1+ associated with R. neglectus in the DF widens the known range of this parasite in Brazil and reinforces the hypothesis of adaptation of T. rangeli populations (KP1+ and KP1- to distinct evolutionary Rhodnius lineages.O Distrito Federal (DF do Brasil está localizado no bioma Cerrado, um complexo de fisionomias savânicas incluindo matas de galeria e campos úmidos permanentes (veredas. Triatomíneos silvestres infectados por Trypanosoma cruzi ocorrem na área, mas a transmissão enzoótica de tripanossomatídeos permanece insuficientemente

  12. Factors affecting patterns of Amblyomma triste (Acari: Ixodidae) parasitism in a rodent host.

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

    2015-07-30

    Here we offer a multivariable analysis that explores associations of different factors (i.e., environmental, host parameters, presence of other ectoparasites) with the interaction of Amblyomma triste immature stages and one of its main hosts in Argentina, the rodent Akodon azarae. Monthly and for two years, we captured and sampled rodents at 16 points located at 4 different sites in the Parana River Delta region. The analyses were conducted with Generalized Linear Mixed Models with a negative binomial response (counts of larvae or nymphs). The independent variables assessed were: (a) environmental: trapping year, season, presence of cattle; type of vegetation (natural grassland or implanted forest); rodent abundance; (b) host parameters: body length; sex; body condition; blood cell counts; natural antibody titres; and (c) co-infestation with other ectoparasites: other stage of A. triste; Ixodes loricatus; lice; mites; and fleas. Two-way interaction terms deemed a priori as relevant were also included in the analysis. Larvae were affected by all environmental variables assessed and by the presence of other ectoparasites (lice, fleas and other tick species). Host factors significantly associated with larval count were sex and levels of natural antibodies. Nymphs were associated with season, presence of cattle, body condition, body length and with burdens of I. loricatus. In most cases, the direction and magnitude of the associations were context-dependent (many interaction terms were significant). The findings of greater significance and implications of our study are two. Firstly, as burdens of A. triste larvae and nymphs were greater where cattle were present, and larval tick burdens were higher in implanted forests, silvopastoral practices developing in the region may affect the population dynamics of A. triste, and consequently the eco-epidemiology of Rickettsia parkeri. Secondly, strong associations and numerous interactions with other ectoparasites suggest that

  13. Características de la población de roedores y pulgas en áreas de diferente riesgo para peste de tres provincias del departamento de Piura-Perú

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    Marco Arrieta T

    2001-07-01

    Full Text Available Objetivo: Identificar las especies de roedores y pulgas en áreas de bajo, mediano y alto riesgo para peste de tres provincias de Piura, determinando su distribución geográfica y densidad poblacional. Materiales y métodos: En este estudio transversal analítico se realizaron capturas de roedores y pulgas en 80 localidades de tres provincias de Piura-Perú entre Marzo del 2000 y Febrero del 2001, realizándose la identificación de sus especies. Las localidades fueron agrupadas en tres áreas: bajo, mediano y alto riesgo para peste. Se tomaron muestras de vísceras de 382 roedores para el aislamiento de Yersinia pestis, mediante cultivo e inmunofluorescencia directa, y muestras de sangre en tiras de Nobuto a 376 roedores y 286 perros para evaluar la presencia de anticuerpos contra Yersinia pestis, a través de la prueba de aglutinación en látex. Se calcularon indicadores de densidad poblacional para roedores y pulgas. Resultados: Akodon sp. (50,4% y Rattus rattus (32,5% fueron las especies de roedores predominantes. 23 localidades tuvieron un índice de atrape de roedores (IAR mayor a 5%. Pulex irritans y Ctenophalides felis fueron las especies de pulgas más frecuentes. Xenopsilia cheopis sólo alcanzó un porcentaje de 0,2%, no encontrándose Polygenes litargus. Los indicadores de densidad poblacional de pulgas fueron bajos. Todas las muestras para cultivo, inmunofluorescencia y serología resultaron negativas. Conclusiones: La población de roedores fue alta en 23 localidades, sin embargo, la densidad poblacional de pulgas y la ausencia de circulación de Yersinia pestis no indican riesgo para la aparición de brotes de peste.

  14. High paracellular nutrient absorption in intact bats is associated with high paracellular permeability in perfused intestinal segments.

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    Brun, Antonio; Price, Edwin R; Gontero-Fourcade, Manuel N; Fernandez-Marinone, Guido; Cruz-Neto, Ariovaldo P; Karasov, William H; Caviedes-Vidal, Enrique

    2014-09-15

    Water-soluble nutrients are absorbed by the small intestine via transcellular and paracellular mechanisms. Based on a few previous studies, the capacity for paracellular nutrient absorption seems greater in flying mammals than in nonflying mammals, but there has been little investigation of the mechanisms driving this difference. Therefore, we studied three species each of bats (Artibeus lituratus, Sturnira lilium and Carollia perspicillata) and nonflying mammals (Akodon montensis, Mus musculus and Rattus norvegicus). Using standard pharmacokinetic techniques in intact animals, we confirmed the greater paracellular nutrient absorption in the fliers, comparing one species in each group. Then we conducted in situ intestinal perfusions on individuals of all species. In both approaches, we measured the absorption of 3OMD-glucose, a nonmetabolizable glucose analog absorbed both paracellularly and transcellularly, as well as L-arabinose, which has no mediated transport. Fractional absorption of L-arabinose was three times higher in the bat (S. lilium: 1.2±0.24) than in the rodent (A. montensis: 0.35±0.04), whereas fractional absorption of 3OMD-glucose was complete in both species (1.46±0.4 and 0.97±0.12, respectively). In agreement, bats exhibited two to 12 times higher l-arabinose clearance per square centimeter nominal surface area than rodents in intestinal perfusions. Using L-arabinose, we estimated that the contribution of the paracellular pathway to total glucose absorption was higher in all three bats (109-137%) than in the rodents (13-39%). These findings contribute to an emerging picture that reliance on the paracellular pathway for nutrient absorption is much greater in bats relative to nonflying mammals and that this difference is driven by differences in intestinal permeability to nutrient-sized molecules.

  15. Extensive Chromosomal Reorganization in the Evolution of New World Muroid Rodents (Cricetidae, Sigmodontinae): Searching for Ancestral Phylogenetic Traits

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    Pereira, Adenilson Leão; Malcher, Stella Miranda; Nagamachi, Cleusa Yoshiko; O’Brien, Patricia Caroline Mary; Ferguson-Smith, Malcolm Andrew; Mendes-Oliveira, Ana Cristina; Pieczarka, Julio Cesar

    2016-01-01

    Sigmodontinae rodents show great diversity and complexity in morphology and ecology. This diversity is accompanied by extensive chromosome variation challenging attempts to reconstruct their ancestral genome. The species Hylaeamys megacephalus–HME (Oryzomyini, 2n = 54), Necromys lasiurus—NLA (Akodontini, 2n = 34) and Akodon sp.–ASP (Akodontini, 2n = 10) have extreme diploid numbers that make it difficult to understand the rearrangements that are responsible for such differences. In this study we analyzed these changes using whole chromosome probes of HME in cross-species painting of NLA and ASP to construct chromosome homology maps that reveal the rearrangements between species. We include data from the literature for other Sigmodontinae previously studied with probes from HME and Mus musculus (MMU) probes. We also use the HME probes on MMU chromosomes for the comparative analysis of NLA with other species already mapped by MMU probes. Our results show that NLA and ASP have highly rearranged karyotypes when compared to HME. Eleven HME syntenic blocks are shared among the species studied here. Four syntenies may be ancestral to Akodontini (HME2/18, 3/25, 18/25 and 4/11/16) and eight to Sigmodontinae (HME26, 1/12, 6/21, 7/9, 5/17, 11/16, 20/13 and 19/14/19). Using MMU data we identified six associations shared among rodents from seven subfamilies, where MMU3/18 and MMU8/13 are phylogenetic signatures of Sigmodontinae. We suggest that the associations MMU2entire, MMU6proximal/12entire, MMU3/18, MMU8/13, MMU1/17, MMU10/17, MMU12/17, MMU5/16, MMU5/6 and MMU7/19 are part of the ancestral Sigmodontinae genome. PMID:26800516

  16. Environmental Variables Associated with Hantavirus Reservoirs and Other Small Rodent Species in Two National Parks in the Paraná Delta, Argentina: Implications for Disease Prevention.

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    Vadell, María Victoria; Gómez Villafañe, Isabel Elisa

    2016-06-01

    Hantavirus pulmonary syndrome (HPS) is a severe zoonotic disease caused by hantaviruses hosted in various rodents species. In Argentina, its transmission to humans has been associated to exposure during activities such as farming, recreation, and tourism which are carried out in wild and rural areas. The aim of this study was to analyze the macro- and micro-habitat use and spatio-temporal variation of small sylvan rodents in Pre Delta and Islas de Santa Fe national parks, located in an HPS-endemic area of Argentina. Rodent communities were studied at six sites: two islands, a riparian forest, an inland forest, a marsh, and the margins of a pond. A total of 453 individuals of five species were captured with a trapping effort of 9471 trap-nights. Maximum species richness was found at the marsh and the pond margin sites. Abundance of rodents was influenced by flooding events. Two hantavirus reservoirs, Oligoryzomys flavescens and Akodon azarae, were identified in the area. O. flavescens was captured in every habitat, but it was dominant in Islas de Santa Fe National Park where its abundance was strongly influenced by flooding. A. azarae was captured in every habitat except on the islands. A. azarae behaved as a generalist species at a micro-habitat scale in every habitat of Pre Delta National Park except for the marsh where it selected patches with low vegetation height. Based on these results, several disease prevention measures, including the use of rodent-proof containers for food, and keeping the grass short in the camp site, are proposed in order to reduce the risk to visitors and residents of contracting HPS. PMID:27169561

  17. Prevalence of infection with hantavirus in rodent populations of central Argentina

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    Olga V Suárez

    2003-09-01

    Full Text Available We studied hantavirus seroprevalence and virus variability in rodent populations in Diego Gaynor, northwest of Buenos Aires province, Argentina. Rodent samplings were conducted in railroads and cropfield borders in March and July 1999, September and December 2000, and March 2001. Antibody detection was performed by an enzyme link immunosorbent assay (ELISA, using the recombinant nucleoprotein of Andes (AND virus as antigen. Tissue samples were taken from positive antibody individuals in order to confirm the presence of hantavirus genomic material and to identify virus genotypes. Akodon azarae was the most abundant species, followed by Oligoryzomys flavescens, while Calomys laucha and C. musculinus were rarely caught. We found a rate of seroprevalence of 9.3% for a total sample of 291 A. azarae and 13.5% for 37 O. flavescens. After molecular analyses of hantavirus, we confirmed the presence of hantavirus genomic material in 16 individuals with ELISA (+ results and two individuals with ELISA (-. Four amplimers for each species were sequenced and compared to the corresponding sequences of representative hantaviruses. We identified the AND Cent Lec from three O. flavescens, and the Pergamino virus from four A. azarae and from one O. flavescens. A. azarae males had higher seroprevalence than females, and heavier individuals showed higher seroprevalence than lighter ones. We did not find seroprevalence differences according to sex in O. flavescens, although this result may have been produced by the low sample size. The lowest seroprevalence was found in a period of high rodent density, when juveniles prevailed in the population. We found higher seroprevalences than those detected in previous studies for other localities of central Argentina where cases of hantavirus pulmonary syndrome (HPS have been reported. The presence of AND Cent Lec virus in rodent populations of the study area, which is responsible of HPS cases in central Argentina, suggests

  18. Contribution to the diversity and conservation knowledge of mammals in the basin of the Apurimac river, Peru

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    Víctor Pacheco

    2013-04-01

    Full Text Available The present work documents the diversity of mammals in the headwaters of the Apurímac river, one of the most important information gaps in Peru, based on an evaluation of fi ve sampling areas in the departments of Apurímac (Cconoc, Velavelayoc, Ayacucho (Yanamonte, Ccentabamba and Cuzco (Catarata. Capture’s effort was 1280 trap-nights and 41 mistnet-nights. Sixty species were recorded in the study area and included 15 threatened species and four species endemic to Perú. As expected, bats and rodents were the most diverse orders (66,7 %. The species diversity in the sites sampled declines signifi cantly with elevation from the lowest elevation sites (Ccentabamba and Catarata to the highest (Velavelayoc. The marsupial Monodelphis peruviana and the Dwarf Brocket deer Mazama chunyi are fifi rst records for the department of Ayacucho. The bats Artibeus planirostris and Myotis keaysi, and the river otter Lontra longicaudis are fifi rst records for the department of Apurímac. For bats, the relative abundance showed a signifi cant negative correlation with elevation, but was not signifi cant for small terrestrial mammals. The species of Sturnira, Akodon and Thomasomys had the highest values of relative abundance. The diversity indices (Shannon-Wiener and Simpson also showed also a signifi cant negative correlation with elevation. The Apurímac river headwater is estimated to have at least 97 mammals species. We recommend creating conservation areas in Huanipaca, Yanamonte and Catarata, and enlarging the area of the Santuario Histórico Machu Picchu to include the archaeological site of Choquequirao.

  19. Parasitic helminths of small mammals in Elba Island

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    Alexis Ribas

    2003-10-01

    Full Text Available We investigated the helminth fauna of small mammals (Rodentia and Insectivora in the mediterranean island of Elba (Italy. We first performed a survey of the parasitic helminths of Rattus rattus (L., 1758, Mus domesticus (Schwarz & Schwarz, 1943 (Rodentia, Murinae, Crocidura suaveolens (Pallas, 1811 (Insectivora, Soricidae and Erinaceus europaeus L., 1758 (Insectivora, Erinaceidae. An expedition was undertaken in January 2002 making an helminth faunistic study of: 14 R. rattus; 11 M. domesticus; 2 C. suaveolens and 1 E. europaeus. A total of 28 animals were trapped at seven stations and nine helminth species were detected: Corrigia vitta Dujardin, 1845 (Dicrocoelidae, Brachylaima erinacei Blanchard, 1847 (Brachylaimidae [Digenea]; Hymenolepis diminuta (Rudolphi, 1819; H. tiara (Dujardin, 1845 (Cestoda, Hymenolepididae; Aonchotheca erinacei Rudolphi, 1819; Capillaria hepatica Bancroft, 1893 (Trichuridae; Mastophorus muris (Gmelin, 1790 (Spirocercidae; Paracrenosoma kontrimavinchusi Guenov, 1978 (Metastrongylidae; Syphacia muris (Yamaguti, 1935 (Oxyuridae [Nematoda]. The house mice were not infected by helminths. In the black rat, five species were detected: C. vitta, H. diminuta, C. hepaticum, M. muris and S. muris. Insectivores hosts were parasitised by B. erinacei, A. erinacei (E. europaeus, H. tiara and P. kontrimavinchusi (C. suaveolens. All species were identified by morphological characteristics and in the cases of H. diminuta and M. muris isozyme electrophoresis were used to compare with continental and insular samples. Helminths found in these hosts in Elba Island (apart of P. kontrimavinchusi are the best colonisers of mediterranean islands. These species were

  20. Relaciones biogeográficas de los sistemas montañosos de la Península Ibérica: el caso de los micromamíferos

    Directory of Open Access Journals (Sweden)

    Vargas, J. M.

    2003-12-01

    Full Text Available In the present paper we analyse the biogeographical relationship between the 12 mountain ranges surrounding the western Mediterranean basin, according to their micromammal fauna (70 species belonging to the orders Erinaceomorpha, Soricomorpha and Rodentia. Using an area classification analysis, we performed a biogeographical regionalization of the study area, and later we characterised the biotic boundaries detected. We also identified the interchanges of species that could have happened between the mountain ranges considered. A strong boundary exists between the European and African faunas, which is characterised by a higher energy availability in the south. For non-rodents micromammals there is also a week boundary between the exclusively-Iberian mountain ranges and the northern ones, which is characterised by a higher simultaneous availability of water and energy in the north. Finally, we suggest the existence of a main interchange of species between Europe and the Iberian Peninsula.

    En el presente artículo se analiza la relación biogeográfica de los 12 sistemas montañosos que circundan la parte más occidental de la cuenca mediterránea, en función de su fauna de micromamíferos (70 especies pertenecientes a los órdenes Erinaceomorpha, Soricomorpha y Rodentia. Se ha llevado a cabo una regionalización biogeográfica del área de estudio, mediante un análisis de clasificación de áreas, y posteriormente se han caracterizado ambientalmente las fronteras bióticas detectadas. Por último, se han identificado los posibles intercambios de especies que han tenido lugar entre los sistemas montañosos considerados. Existe una frontera fuerte entre las faunas europea y africana, caracterizada en términos ambientales por una mayor disponibilidad de energía en el sur. Además, para los micromamíferos no roedores, se detecta una frontera débil que separa los sistemas montañosos exclusivamente ibéricos del resto, caracterizada por