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Sample records for balanus improvisus crustacea

  1. Immunocytochemical studies on the naupliar nervous system of Balanus improvisus (Crustacea, Cirripedia, Thecostraca)

    DEFF Research Database (Denmark)

    Semmler, Henrike; Wanninger, Andreas; Høeg, Jens T

    2008-01-01

    The nervous system of nauplii of the crustacean taxon Cirripedia was analysed in the species Balanus improvisus Darwin, 1854 using for the first time immunocytochemical staining against serotonin, RFamide and alpha-tubulin in combination with confocal laser scanning microscopy. This approach reve...... is more complex than the adult brain. It is concluded that this ontogenetic brain reduction is related to the sessile life style of adult Cirripedia.......The nervous system of nauplii of the crustacean taxon Cirripedia was analysed in the species Balanus improvisus Darwin, 1854 using for the first time immunocytochemical staining against serotonin, RFamide and alpha-tubulin in combination with confocal laser scanning microscopy. This approach...... of the branchiopod, Artemia franciscana Kellogg, 1906 in our analysis. We describe several characteristic neurons in the brains of the nauplius larvae of both species which are also found in decapod larvae and in adult brains of other crustaceans. Furthermore, our data reveal that the naupliar brain of cirripedes...

  2. Three-dimensional reconstruction of the naupliar musculature and a scanning electron microscopy atlas of nauplius development of Balanus improvisus (Crustacea

    DEFF Research Database (Denmark)

    Semmler, Henrike; Høeg, Jens Thorvald; Scholtz, Gerhard

    2009-01-01

    An atlas of the naupliar development of the cirripede Balanus improvisus Darwin, 1854 using scanning electron microscopy (SEM) is provided. Existing spikes on the hindbody increase in number with each moult and are an applicable character for identification of the different nauplius stages, as is...... that the key features of the naupliar gross anatomy and muscular architecture of B. improvisus are important characters for phylogenetic inferences if analysed in a comparative evolutionary framework....

  3. Correlation between surface chemistry and settlement behaviour in barnacle cyprids (Balanus improvisus).

    Science.gov (United States)

    Di Fino, A; Petrone, L; Aldred, N; Ederth, T; Liedberg, B; Clare, A S

    2014-02-01

    In laboratory-based biofouling assays, the influence of physico-chemical surface characteristics on barnacle settlement has been tested most frequently using the model organism Balanus amphitrite (= Amphibalanus amphitrite). Very few studies have addressed the settlement preferences of other barnacle species, such as Balanus improvisus (= Amphibalanus improvisus). This study aimed to unravel the effects of surface physico-chemical cues, in particular surface-free energy (SFE) and surface charge, on the settlement of cyprids of B. improvisus. The use of well-defined surfaces under controlled conditions further facilitates comparison of the results with recent similar data for B. amphitrite. Zero-day-old cyprids of B. improvisus were exposed to a series of model surfaces, namely self-assembled monolayers (SAMs) of alkanethiols with varying end-groups, homogenously applied to gold-coated polystyrene (PS) Petri dishes. As with B. amphitrite, settlement of cyprids of B. improvisus was influenced by both SFE and charge, with higher settlement on low-energy (hydrophobic) surfaces and negatively charged SAMs. Positively charged SAMs resulted in low settlement, with intermediate settlement on neutral SAMs of similar SFE. In conclusion, it is demonstrated that despite previous suggestions to the contrary, these two species of barnacle show similar preferences in response to SFE; they also respond similarly to charge. These findings have positive implications for the development of novel antifouling (AF) coatings and support the importance of consistency in substratum choice for assays designed to compare surface preferences of fouling organisms.

  4. Determining postmortem interval using glycoproteinous adhesion deposits by Balanus improvisus on human skeletal and dental remains.

    Science.gov (United States)

    Bytheway, Joan A; Pustilnik, Stephen M

    2013-01-01

    An anthropological analysis was conducted on skeletal and dental remains brought to the Galveston County Medical Examiner's office. The skeletal remains were dry, fragmented, and absent of typical fluvial characteristics. During microscopic examination, semitransparent, circular objects were discovered on the dentition, the mandible, tibial plateau, and distal femur. The objects were glycoproteinous adhesions deposited by the acorn barnacle, Balanus improvisus. B. improvisus is an intertidal barnacle found in estuaries in Galveston Bay. Basal diameter of the adhesions on the dentition were significantly smaller than those found on the postcranial bones (p = 0.010), indicating two consecutive cohorts adhered to the bone and dentition. As settlement typically occurs once a year, this would indicate that the remains were in the fluvial environment for at least 375-410 days. It is important in geographic areas that have prevalent fluvial environments that human remains, particularly dentition, are microscopically examined for marine life evidence. © 2012 American Academy of Forensic Sciences.

  5. The Story of a Hitchhiker: Population Genetic Patterns in the Invasive Barnacle Balanus(Amphibalanus improvisus Darwin 1854.

    Directory of Open Access Journals (Sweden)

    Anna-Lisa Wrange

    Full Text Available Understanding the ecological and evolutionary forces that determine the genetic structure and spread of invasive species is a key component of invasion biology. The bay barnacle, Balanus improvisus (= Amphibalanus improvisus, is one of the most successful aquatic invaders worldwide, and is characterised by broad environmental tolerance. Although the species can spread through natural larval dispersal, human-mediated transport through (primarily shipping has almost certainly contributed to the current global distribution of this species. Despite its worldwide distribution, little is known about the phylogeography of this species. Here, we characterize the population genetic structure and model dispersal dynamics of the barnacle B. improvisus, and describe how human-mediated spreading via shipping as well as natural larval dispersal may have contributed to observed genetic variation. We used both mitochondrial DNA (cytochrome c oxidase subunit I: COI and nuclear microsatellites to characterize the genetic structure in 14 populations of B. improvisus on a global and regional scale (Baltic Sea. Genetic diversity was high in most populations, and many haplotypes were shared among populations on a global scale, indicating that long-distance dispersal (presumably through shipping and other anthropogenic activities has played an important role in shaping the population genetic structure of this cosmopolitan species. We could not clearly confirm prior claims that B. improvisus originates from the western margins of the Atlantic coasts; although there were indications that Argentina could be part of a native region. In addition to dispersal via shipping, we show that natural larval dispersal may play an important role for further colonisation following initial introduction.

  6. Molecular characterization of the α-subunit of Na⁺/K⁺ ATPase from the euryhaline barnacle Balanus improvisus reveals multiple genes and differential expression of alternative splice variants.

    Directory of Open Access Journals (Sweden)

    Ulrika Lind

    Full Text Available The euryhaline bay barnacle Balanus improvisus has one of the broadest salinity tolerances of any barnacle species. It is able to complete its life cycle in salinities close to freshwater (3 PSU up to fully marine conditions (35 PSU and is regarded as one of few truly brackish-water species. Na⁺/K⁺ ATPase (NAK has been shown to be important for osmoregulation when marine organisms are challenged by changing salinities, and we therefore cloned and examined the expression of different NAKs from B. improvisus. We found two main gene variants, NAK1 and NAK2, which were approximately 70% identical at the protein level. The NAK1 mRNA existed in a long and short variant with the encoded proteins differing only by 27 N-terminal amino acids. This N-terminal stretch was coded for by a separate exon, and the two variants of NAK1 mRNAs appeared to be created by alternative splicing. We furthermore showed that the two NAK1 isoforms were differentially expressed in different life stages and in various tissues of adult barnacle, i.e the long isoform was predominant in cyprids and in adult cirri. In barnacle cyprid larvae that were exposed to a combination of different salinities and pCO2 levels, the expression of the long NAK1 mRNA increased relative to the short in low salinities. We suggest that the alternatively spliced long variant of the Nak1 protein might be of importance for osmoregulation in B. improvisus in low salinity conditions.

  7. Preliminary results on the anatomy of the larval musculature of Balanus improvisus (Darwin, 1854) (Crustacea: Cirripedia: Thecostraca) using phalloidin staining in combination with confocal laserscanning microscopy

    DEFF Research Database (Denmark)

    Semmler, Henrike; Høeg, Jens Thorvald; Scholtz, Gerhard

    2006-01-01

    is situated below the labrum. Close to the stomodeum lie a transversal muscle, a pair of oblique muscles, and a pair of supra-labral muscles. Nine pairs of muscles are attached along the dorsal midline of the head shield. These data show that the application of fluorescence techniques provides a wide range...

  8. Antifouling effect of bioactive compounds from marine sponge Acanthella elongata and different species of bacterial film on larval attachment of Balanus amphitrite (cirripedia, crustacea

    Directory of Open Access Journals (Sweden)

    Viswambaran Ganapiriya

    2012-06-01

    Full Text Available The antifouling activity of bioactive compounds from marine sponge Acanthella elongata (Dendy and five species of bacterial biofilm were studied. Larvae of Balanus amphitrite (Cyprids and nauplii were used to monitor the settlement inhibition and the extent to which inhibition was due to toxicity. The crude extract and partially purified fractions of A.elongata showed significant inhibition over the settlement individually, and with the interaction of bacterial species. No bacterial film stimulated the barnacle settlement. The high but variable levels of antifouling activity in combination with less amount of toxicity showed the potential of these metabolites in environmentally-friendly antifouling preparations.

  9. Balanus amphitrite or Amphibalanus amphitrite?

    DEFF Research Database (Denmark)

    Clare, Anthony S; Høeg, Jens Thorvald

    2008-01-01

    In a recent revision of the Balanidae based on morphological systematics, the much studied fouling species Balanus amphitrite was renamed Amphibalanus amphitrite. Here, the case is made for retaining the former nomenclature. Taxonomists are urged to exercise caution before introducing new formal...

  10. Cryoperservation of Balanus amphitrite nauplii

    Digital Repository Service at National Institute of Oceanography (India)

    Anil, A.C.; Tulaskar, A.S.; Khandeparker, D.C.; Wagh, A.B.

    pro- the greatest survival of the cryoprotectants ex- tective additives (cryoprotectants) such as amined (Fig. 1). In this investigation, barnacle larvae also showed increasing susceptibility tomethanol, EG, Me 2 SO, and GL have been AID CRYO 1991 / a... barnacle, Balanus amphitrite. We investigated the effects of equilibration in solutions ofand veterinary sciences, but its application in marine science is new and is only now being three different cryoprotectants, slow freezing to various temperatures (020...

  11. Crustacea; Talitridae

    African Journals Online (AJOL)

    Distribution of the amphipod, Talorchestia capensis (Crustacea; Talitridae) has been studied in a dune-beach system. The majority of amphipods occurred in dune slacks with fewer on the beach. No zonation of size classes existed, both juveniles and adults occurring throughout the slack. Amphipods were concentrated in ...

  12. Biological features on epibiosis of Amphibalanus improvisus (Cirripedia on Macrobrachium acanthurus (Decapoda

    Directory of Open Access Journals (Sweden)

    Cristiane Maria Rocha Farrapeira

    2010-06-01

    Full Text Available This study aimed to describe the epibiosis of barnacles Amphibalanus improvisus on eight adult Macrobrachium acanthurus males from the Mundaú Lagoon, state of Alagoas, Brazil. The number of epibiont barnacles varied from 247 to 1,544 specimens per prawn; these were distributed predominantly on the cephalothorax and pereiopods, but also on the abdomen and other appendices. Although some were already reproducing, most barnacles had been recruited recently or were still sexually immature; this suggests recent host arrival in that estuarine environment. Despite the fact that other barnacles occur in this region, A. improvisus is the only species reported as an epibiont on Macrobrachium acanthurus; this was also the first record of epibiosis on this host. The occurrence of innumerable specimens in the pereiopods' articulations and the almost complete covering of the carapace of some prawns (which also increased their weight suggest that A. improvisus is adapted to fixate this kind of biogenic substrate and that the relationship between the two species biologically damages the basibiont.O objetivo deste trabalho foi relatar a epibiose de cirrípedes Amphibalanus improvisus em oito camarões machos adultos da espécie Macrobrachium acanthurus provenientes da Laguna Mundaú, Alagoas, Brasil. O número de cirrípedes epibiontes variou desde 247 até 1.544 espécimes por camarão, distribuídos predominantemente no cefalotórax e pereiópodos, mas presentes também no abdome e demais apêndices. A grande maioria dos cirrípedes era recém-recrutada ou ainda estava sexualmente imatura, embora de alguns estivessem já em reprodução, sugerindo a chegada recente de seu hospedeiro no ambiente estuarino. Apesar de ocorrem outros cirrípedes na região, A. improvisus foi à única espécie relatada como epibionte em Macrobrachium acanthurus e isto se constituiu o primeiro registro de epibiose de Amphibalanus improvisus A ocorrência de inúmeros esp

  13. Factors affecting the recruitment of Amphibalanus improvisus and Dreissena polymorpha in a highly eutrophic brackish bay

    Science.gov (United States)

    Oganjan, Katarina; Lauringson, Velda; Kotta, Jonne; Rostin, Liis; Martin, Georg

    2017-01-01

    Species invasions are modifying ecosystems worldwide. Coexistence of invasive species of no common evolutionary history in their new ranges enables the study of ecological rules shaping novel communities at their initial stages. In oligohaline parts of the Baltic Sea, the most dominant and widespread epifaunal suspension feeders are invasive mussels Dreissena polymorpha and cirripeds Amphibalanus improvisus. This study experimentally evaluated recruitment and microhabitat use in response to environmental forcing in these two species in a eutrophic bay. Recruitment was structured by different microhabitat exploitation patterns coupled with both individual and interactive effects of several environmental gradients. Despite functional similarity, the importance of environmental gradients differed between these species: mussel recruitment was best explained by temperature while barnacle recruitment was best explained by wave exposure. Zebra mussels were more fastidious about surface orientation than barnacles. The preferred orientations also differed between species, as mussels strongly preferred horizontal surfaces, while barnacles were more abundant on vertical surfaces. Increase in one species also predicted well the abundance of the other, especially for barnacles, as mussel abundance was the best predictor of barnacle abundance over all the other factors. The extent of microhabitat segregation correlated weakly over the studied range of the most important environmental gradients. The study shows that coexistence of functionally similar non-native D. polymorpha and A. improvisus in their sympatric range is likely determined by complex interactions between these species, their different microhabitat exploitation patterns, environmental limitations and optima.

  14. (Ortmann) (Decapoda, Crustacea)

    African Journals Online (AJOL)

    1987-03-13

    Mar 13, 1987 ... duration and current velocity) of the populations to the flow of water entering the estuary during flood tides, ... 2,5 m deep) and has a tidal fetch of about 16 ...... Energy dynamics of two benthic crustacea in relationship to diet. J. Fish. Res. Bd. Can. 33(11): 2544-2550. . TUNNICLIFFE, V. & RISK, M.J. 1977.

  15. Identification of Balanus amphitrite larvae from field zooplankton using species-specific primers

    Digital Repository Service at National Institute of Oceanography (India)

    Gaonkar, C.C.; Khandeparker, L.; Desai, D.V.; Anil, A.C.

    Identification of marine invertebrate larvae using morphological characters is laborious and complicated by phenotypic plasticity. Balanus amphitrite is a dominant barnacle, important in the context of intertidal ecology and biofouling of manmade...

  16. Role of conspecific cues and sugars in the settlement of cyprids of the barnacle, Balanus amphitrite

    Digital Repository Service at National Institute of Oceanography (India)

    Khandeparker, L; Anil, A.C.

    inoculated with these extracts at a protein concentration of 50mgmL C01 . After 3h, the multiwells were washed thrice with autoclaved, filtered seawater. The adsorption of glycoprotein was confirmed under the micro- scope after staining the washed dishes... and sugars in the settlement of cyprids of the barnacle, Balanus amphitrite L. Khandeparker & A. C. Anil National Institute of Oceanography, Council of Scientific and Industrial Research, Dona Paula, Goa, India Keywords arthropodin; sugars; barnacle; Balanus...

  17. Algal epibiosis on Megabalanus tintinnabulum and its role in segregation of the Balanus amphitrite population

    Digital Repository Service at National Institute of Oceanography (India)

    Eswaran, R.; Khandeparker, L.

    .C., Khandeparker L., Desai D.V., Baragi L.V., Gaonkar G.A. (2010) Larval development, sensory mechanisms and physiological adaptations in acorn barnacles with special reference to Balanus amphitrite. Journal of Experimental Marine Biology and Ecology, 392, 89... of the barnacle Balanus amphitrite Darwin in a tropical estuary: implications of environmental perturbation, reproduction and larval ecology. Journal of the Marine Biological Association of the United Kingdom, 89, 909-920. Dobretsov S., Dahms H.U., Qian P...

  18. Video observation of surface exploration in cyprids of Balanus amphitrite

    DEFF Research Database (Denmark)

    Maruzzo, Diego; Conlan, Sheelagh; Aldred, Nick

    2011-01-01

    Video microscopy of cyprids of Balanus amphitrite was used to monitor the action of antennular setae during the exploratory behaviour prior to attachment. In addition, SEM was used to provide a revised description of all antennular setae for that species. The videos describe if a particular seta...

  19. Accumulation of copper and zinc by balanus amphitrite in a tropical estuary

    Digital Repository Service at National Institute of Oceanography (India)

    Anil, A.C.; Wagh, A.B.

    @iBalanus amphitrite@@ (Cirripedia: Thoracica) a dominant fouling organism was analysed to assess the accumulation potentialities of copper and zinc. It was observed that it could accumulate Cu to 864.77 mu g g-1 dry wt. and Zn to 1937.50 mu g g-1...

  20. Epibiotic community on the acorn barnacle (Balanus amphitrite) from a monsoon-influenced tropical estuary

    Digital Repository Service at National Institute of Oceanography (India)

    Sahoo, G.; Khandeparker, L.

    The epibiotic communities (diatoms and metazoans) on the outer surfaces of the shell of the barnacle Balanus amphitrite (BSh) and its opercular valves (the scutum and tergum; BST) were investigated on a monthly basis for 1 year in a tropical monsoon...

  1. Larval development and metamorphosis of Balanus albicostatus (Cirripedia: Thoracica); implications of temperature, food concentration and energetics

    Digital Repository Service at National Institute of Oceanography (India)

    Desai, D.V.; Khandeparker, L.; Shirayama, Y.

    The influence of food concentrations (0.5, 1 and 2 x 105 cells ml sup(-1)) and temperatures (20 and 30 degrees C) on the survival, development, organic carbon and nitrogen content of Balanus albicostatus larvae was evaluated The effect of food...

  2. Influence of food concentration, temperature and salinity on the larval development of Balanus amphitrite

    Digital Repository Service at National Institute of Oceanography (India)

    Anil, A.C.; Kurian, J.

    Influence of food concentration (0.5, 1 and 2 x 10 sup(5) cell ml sup(-1) of Skeletonema costatum), temperature (20 and 30 degrees C) and salinity (15, 25 and 35 ppt) on the larval development of Balanus amphitrite (Cirripedia: Thoracica...

  3. The impact of food type, temperature and starvation on larval development of Balanus amphitrite Darwin (Cirripedia: Thoracica)

    Digital Repository Service at National Institute of Oceanography (India)

    Desai, D.V.; Anil, A.C.

    The impact of diatom food species (Chaetoceros calcitrans and Skeletonema costatum), temperature and starvation on the larval development of Balanus amphitrite was evaluated. Starvation threshold levels for different ages of larvae (0- to 5-day...

  4. Influence of bacterial exopolymers, conspecific adult extract and salinity on the cyprid metamorphosis of Balanus amphitrite (Cirripedia: Thoracica)

    Digital Repository Service at National Institute of Oceanography (India)

    Anil, A.C.; Khandeparker, R.

    The influence of bacterial exopolymers and conspecific adult extract of Balanus amphitrite on metamorphosis of cyprid larvae at different salinities has been evaluated through laboratory assay. The bacterial exopolymers (epm) extracted from...

  5. Significance of biofilm proteins in modulating cyprid metamorphosis of Balanus amphitrite (Cirripedia: Thoracica)

    Digital Repository Service at National Institute of Oceanography (India)

    Khandeparker, L.; KrishnaKumar, S.

    and cleaned using nylon brush to remove all the epiphytes. Equal weight/volume of deionized, RO pure water was used to crush the adults using a pestle and mortar. Subsequently, the mixture was centrifuged at 12 000 x g for 5 min. The supernatant... Marine Biology and Ecology, 313, 191-209. Desai D.V., Anil A.C. (2004) The impact of food type, temperature and starvation on the larval development of Balanus amphitrite Darwin (Cirripedia: Thoracica). Journal of Experimental Marine Biology...

  6. Community composition, structure, and interrelationships in the marine intertidal Endocladia muricata – Balanus glandula association in Monterey Bay, California

    NARCIS (Netherlands)

    Glynn, Peter W.

    1965-01-01

    Studies of the community composition, structure and species interrelationships of the Endocladia-Balanus association were carried out on the rocky shores at the Hopkins Marine Station, Pacific Grove, California, over the period 1959—1961. The organisms making up this biotic association form a

  7. Comparison of nutritional status of field and laboratory reared Balanus amphitrite Darwin (Cirripedia: Thoracica) larvae and implication of starvation

    Digital Repository Service at National Institute of Oceanography (India)

    Desai, D.V.; Anil, A.C.

    Experiments were carried out to evaluate the influence of rearing temperature and food concentration (20 and 30 degrees C, 1x10 sup(5) and 2x10 sup(5) cells ml sup(-1)) on the starvation threshold and nucleic acid content of the larvae of Balanus...

  8. Larval development and metamorphosis in Balanus amphitrite Darwin (Cirripedia; Thoracica): Significance of food concentration, temperature and nucleic acids

    Digital Repository Service at National Institute of Oceanography (India)

    Anil, A.C.; Desai, D.V.; Khandeparker, L.

    The influence of food concentration (Chaetoceros calcitrans at 1 x 10 sup(5) and 2 x 10 sup(5) cells ml sup(-1)) and temperature (20 degrees C and 30 degrees C) on the nucleic acid content of the nauplii and the cyprids of Balanus amphitrite...

  9. Antifouling Activity of Simple Synthetic Diterpenoids against Larvae of the Barnacle Balanus albicostatus Pilsbry

    Directory of Open Access Journals (Sweden)

    Dan-Qing Feng

    2010-11-01

    Full Text Available Five new pimarane diterpenoids 1-5 were synthesized using ent-8(14-pimarene-15R,16-diol as starting material. The structures were elucidated by means of extensive NMR and MS analysis. The antifouling activity against larval settlement of the barnacle Balanus albicostatus were evaluated using capsaicin as a positive control. Compounds 1-3 and 5 showed more potent antifouling activity than capsaicin. Compound 5, which exhibited almost the same antifouling activity as starting material, showed better stability than starting material. These compounds all showed antifouling activity in a non-toxic way against larval settlement of the barnacle B. albicostatus. Analysis of structure-activity relationships (SAR demonstrated that the substituents on the C-15 and C-16 position of pimarane diterpenoid were responsible for the antifouling activity.

  10. Presence and distribution of serotonin immunoreactivity in the cyprids of the barnacle Balanus amphitrite

    Directory of Open Access Journals (Sweden)

    L Gallus

    2009-06-01

    Full Text Available In this work, the presence and distribution of serotonin in the cyprid of the barnacle Balanus amphitrite were investigated by immunohistochemical methods. Serotonin-like immunoreactive neuronal cell bodies were detected in the central nervous system only. Various clusters of immunoreactive neuronal cell bodies are distributed in the brain (protocerebrum, deutocerebrum, optical lobes, and at least, four pairs of neuronal cell bodies were detected in the centrally positioned neuropil of the posterior ganglion. Rich plexuses of immunoreactive nerve fibers in the neuropil area were also observed. Furthermore, bundles of strongly immunoreactive nerve fibers surrounding the gut wall were localized, and immunoreactive nerve terminals in the antennules and compound eyes were observed. These data demonstrate the presence of a serotonin-like immunoreactive substance in the barnacle cyprids; furthermore, its immunolocalization in the cephalic nerve terminals allows us to postulate the involvement of this bioactive molecule in substrate recognition during the settlement process.

  11. Response of cyprid specific genes to natural settlement cues in the barnacle Balanus (=Amphibalanus) amphitrite

    KAUST Repository

    Li, Honglei

    2010-06-01

    Quantitative real-time PCR was used to further our understanding of the molecular processes involved in the attachment and metamorphosis of larval barnacles. We report the effects of natural settlement cues (microbial biofilms and conspecific settlement-inducing factor) on the expression profiles of six barnacle cyprid specific (bcs) genes in cyprids of the barnacle Balanus (=Amphibalanus) amphitrite Darwin. Genes bcs-1 to bcs-5 all showed marked decreases in their expression between initial cyprid attachment and the completion of metamorphosis, whereas bcs-6 showed significant up-regulation. Generally, settlement cues exerted no significant effect on the decreasing trend of bcs-1 to bcs-5 expression during attachment and metamorphosis. However, the expression of bcs-6 increased prior to cyprid attachment in response to both settlement cues. This elevated expression of bcs-6 gene indicates the importance and key regulatory role of this specific gene to larval attachment and metamorphosis in this barnacle species. © 2010 Elsevier B.V. All rights reserved.

  12. Transcriptome and proteome dynamics in larvae of the barnacle Balanus Amphitrite from the Red Sea

    KAUST Repository

    Chandramouli, Kondethimmanahalli

    2015-12-15

    Background The barnacle Balanus amphitrite is widely distributed in marine shallow and tidal waters, and has significant economic and ecological importance. Nauplii, the first larval stage of most crustaceans, are extremely abundant in the marine zooplankton. However, a lack of genome information has hindered elucidation of the molecular mechanisms of development, settlement and survival strategies in extreme marine environments. We sequenced and constructed the genome dataset for nauplii to obtain comprehensive larval genetic information. We also investigated iTRAQ-based protein expression patterns to reveal the molecular basis of nauplii development, and to gain information on larval survival strategies in the Red Sea marine environment. Results A nauplii larval transcript dataset, containing 92,117 predicted open reading frames (ORFs), was constructed and used as a reference for the proteome analysis. Genes related to translation, oxidative phosphorylation and cytoskeletal development were highly abundant. We observed remarkable plasticity in the proteome of Red Sea larvae. The proteins associated with development, stress responses and osmoregulation showed the most significant differences between the two larval populations studied. The synergistic overexpression of heat shock and osmoregulatory proteins may facilitate larval survival in intertidal habitats or in extreme environments. Conclusions We presented, for the first time, comprehensive transcriptome and proteome datasets for Red Sea nauplii. The datasets provide a foundation for future investigations focused on the survival mechanisms of other crustaceans in extreme marine environments.

  13. Effects of poly-ether B on proteome and phosphoproteome expression in biofouling Balanus amphitrite cyprids

    KAUST Repository

    Dash, Swagatika

    2012-04-01

    Biofouling is ubiquitous in marine environments, and the barnacle Balanus amphitrite is one of the most recalcitrant and aggressive biofoulers in tropical waters. Several natural antifoulants that were claimed to be non-toxic have been isolated in recent years, although the mechanism by which they inhibit fouling is yet to be investigated. Poly-ether B has shown promise in the non-toxic inhibition of larval barnacle attachment. Hence, in this study, multiplex two-dimensional electrophoresis (2-DE) was applied in conjunction with mass spectrometry to investigate the effects of poly-ether B on barnacle larvae at the molecular level. The cyprid proteome response to poly-ether B treatment was analyzed at the total proteome and phosphoproteome levels, with 65 protein and 19 phosphoprotein spots found to be up- or down-regulated. The proteins were found to be related to energy-metabolism, oxidative stress, and molecular chaperones, thus indicating that poly-ether B may interfere with the redox-regulatory mechanisms governing the settlement of barnacle larvae. The results of this study demonstrate the usefulness of the proteomic technique in revealing the working mechanisms of antifouling compounds. © 2012 Copyright Taylor and Francis Group, LLC.

  14. Quantitative proteomics study of larval settlement in the barnacle Balanus amphitrite

    KAUST Repository

    Chen, Zhang-Fan

    2014-02-13

    Barnacles are major sessile components of the intertidal areas worldwide, and also one of the most dominant fouling organisms in fouling communities. Larval settlement has a crucial ecological effect not only on the distribution of the barnacle population but also intertidal community structures. However, the molecular mechanisms involved in the transition process from the larval to the juvenile stage remain largely unclear. In this study, we carried out comparative proteomic profiles of stage II nauplii, stage VI nauplii, cyprids, and juveniles of the barnacle Balanus amphitrite using label-free quantitative proteomics, followed by the measurement of the gene expression levels of candidate proteins. More than 700 proteins were identified at each stage; 80 were significantly up-regulated in cyprids and 95 in juveniles vs other stages. Specifically, proteins involved in energy and metabolism, the nervous system and signal transduction were significantly up-regulated in cyprids, whereas proteins involved in cytoskeletal remodeling, transcription and translation, cell proliferation and differentiation, and biomineralization were up-regulated in juveniles, consistent with changes associated with larval metamorphosis and tissue remodeling in juveniles. These findings provided molecular evidence for the morphological, physiological and biological changes that occur during the transition process from the larval to the juvenile stages in B. amphitrite. © 2014 Chen et al.

  15. Comparative Proteome and Phosphoproteome Analyses during Cyprid Development of the Barnacle Balanus ( =Amphibalanus ) amphitrite

    KAUST Repository

    Zhang, Yu

    2010-06-04

    The barnacle Balanus amphitrite (=Amphibalanus amphitrite) is a major marine biofouling invertebrate worldwide. It has a complex life cycle during which the larva (called a nauplius) molts six times before transforming into the cyprid stage. The cyprid stage in B. amphitrite is the critical stage for the larval decision to attach and metamorphose. In this study, proteome and phosphoproteome alterations during cyprid development/aging and upon treatment with the antifouling agent butenolide were examined with a two-dimensional electrophoresis (2-DE) multiplexed fluorescent staining approach. Optimized protein separation strategies, including solution-phase isoelectric fractionation and narrow-pH-range 2-DE, were used in a proteomic analysis. Our results show that the differential regulation of the target proteins is highly dynamic on the levels of both protein expression and posttranslational modification. Two groups of proteins, stress-associated and energy metabolism-related proteins, are differentially expressed during cyprid development. Comparison of the control and treatment groups suggests that butenolide exerts its effects by sustaining the expression levels of these proteins. Altogether, our data suggest that proteins involved in stress regulation and energy metabolism play crucial roles in regulating larval attachment and metamorphosis of B. amphitrite. © 2010 American Chemical Society.

  16. A new species of Chonopeltis (Crustacea: Branchiura) from the ...

    African Journals Online (AJOL)

    Abstract. A new species of Chonopeltis (Crustacea: Branchiura) is described from material collected from the gill chamber of the snake catfish Ciarias theodorae from the Mogalakwena River, a tributary of the Limpopo River in northern Transvaal.

  17. Decapod crustacea of the Atlantic Coast of Canada

    National Research Council Canada - National Science Library

    Squires, Hubert J

    1990-01-01

    .... Distribution records for each species are provided. The Introduction has a brief history of collections of decapod Crustacea in the area, and the Appendix includes a list of mythological references to some taxonomic names used...

  18. The Story of a Hitchhiker

    DEFF Research Database (Denmark)

    Wrange, Anna-Lisa; Charrier, Gregory; Thonig, Anne

    2016-01-01

    Understanding the ecological and evolutionary forces that determine the genetic structure and spread of invasive species is a key component of invasion biology. The bay barnacle, Balanus improvisus (= Amphibalanus improvisus), is one of the most successful aquatic invaders worldwide, and is chara...

  19. The fluid dynamics of Balanus glandula barnacles: Adaptations to sheltered and exposed habitats.

    Science.gov (United States)

    Vo, Maureen; Mehrabian, Sasan; Villalpando, Fernando; Etienne, Stephane; Pelletier, Dominique; Cameron, Christopher B

    2018-04-11

    Suspension feeders use a wide range of appendages to capture particles from the surrounding fluid. Their functioning, either as a paddle or a sieve, depends on the leakiness, or amount of fluid that passes through the gaps between the appendages. Balanus glandula is the most common species of barnacle distributed along the Pacific coast of North America. It shows a strong phenotypic response to water flow velocity. Individuals from exposed, high flow sites have short and robust cirral filters, whereas those from sheltered, low velocity sites have long, spindly appendages. Computational fluid dynamics (CFD) simulations of these two ecophenotypes were done using a finite volume method. Leakiness was determined by simulating flow velocity fields at increasing Reynolds numbers, results that have been unattainable at higher velocities by observation. CFD also allowed us to characterize flow in hard to see regions of the feeding legs (rami). Laser-illumination experiments were performed at low to medium flow velocities in a flume tank and corroborated results from CFD. Barnacle filters from a sheltered site become completely leaky at Re=2.24(0.16m/s), well above the maximum habitat velocity, suggesting that this ecophenotype is not mechanically optimized for feeding. Barnacles from exposed environments become fully leaky within the range of habitat velocities Re=3.50(0.18m/s). Our CFD results revealed that the drag force on exposed barnacles feeding appendages are the same as the sheltered barnacles feeding appendages despite their shape difference and spacing ratio. Copyright © 2018 Elsevier Ltd. All rights reserved.

  20. Expression of Calmodulin and Myosin Light Chain Kinase during Larval Settlement of the Barnacle Balanus amphitrite

    KAUST Repository

    Chen, Zhang-Fan

    2012-02-13

    Barnacles are one of the most common organisms in intertidal areas. Their life cycle includes seven free-swimming larval stages and sessile juvenile and adult stages. The transition from the swimming to the sessile stages, referred to as larval settlement, is crucial for their survivor success and subsequent population distribution. In this study, we focused on the involvement of calmodulin (CaM) and its binding proteins in the larval settlement of the barnacle, Balanus (= Amphibalanus) amphitrite. The full length of CaM gene was cloned from stage II nauplii of B. amphitrite (referred to as Ba-CaM), encoding 149 amino acid residues that share a high similarity with published CaMs in other organisms. Quantitative real-time PCR showed that Ba-CaM was highly expressed in cyprids, the stage at which swimming larvae are competent to attach and undergo metamorphosis. In situ hybridization revealed that the expressed Ba-CaM gene was localized in compound eyes, posterior ganglion and cement glands, all of which may have essential functions during larval settlement. Larval settlement assays showed that both the CaM inhibitor compound 48/80 and the CaM-dependent myosin light chain kinase (MLCK) inhibitor ML-7 effectively blocked barnacle larval settlement, whereas Ca 2+/CaM-dependent kinase II (CaMKII) inhibitors did not show any clear effects. The subsequent real-time PCR assay showed a higher expression level of Ba-MLCK gene in larval stages than in adults, suggesting an important role of Ba-MLCK gene in larval development and competency. Overall, the results suggest that CaM and CaM-dependent MLCK function during larval settlement of B. amphitrite. © 2012 Chen et al.

  1. Landpissebedden van de Ooijpolder: deel 2. Ecologie (Crustacea: Isopoda: Oniscidea)

    NARCIS (Netherlands)

    Wijnhoven, H.

    2001-01-01

    Terrestrial isopods of the Ooijpolder: part 2. ecology (Crustacea: Isopoda: Oniscidea) From 1991 up to 1998 the isopod fauna of 1464 squares of 100x100 m was sampled in the Ooijpolder. This area is situated along the river Waal, east of Nijmegen (the Netherlands), close to the German border. In part

  2. Landpissebedden van de Ooijpolder: deel 1. verspreiding (Crustacea: Isopoda: Oniscidea)

    NARCIS (Netherlands)

    Wijnhoven, H.

    2000-01-01

    Terrestrial isopods of the Ooijpolder: part 1. distribution (Crustacea: Isopoda: Oniscidea) The distributions and habitats of woodlice were investigated in ‘the Ooijpolder’, also named ‘the Ooij’. The area of approximately 41 square kilometers is located along the river Waal, east of Nijmegen,

  3. Introduction to Some Species of Argulus (Crustacea: Branchiura ...

    African Journals Online (AJOL)

    PROF HORSFALL

    2017-12-12

    Dec 12, 2017 ... of the response of rainbow trout Oncorhynchus mykiss(Walbaum) to confinement, by an ectoparasitic (Argulus foliaceus L.) infestation and cortisol feeding. Fish Physiology and. Biochemistry. 20: 43-51. Saha, M; Bandyopadhyay, PK (2015). First report of three species of Argulus (Crustacea: Branchiura).

  4. Plant feeding promotes diversification in the Crustacea.

    Science.gov (United States)

    Poore, Alistair G B; Ahyong, Shane T; Lowry, James K; Sotka, Erik E

    2017-08-15

    About half of the world's animal species are arthropods associated with plants, and the ability to consume plant material has been proposed to be an important trait associated with the spectacular diversification of terrestrial insects. We review the phylogenetic distribution of plant feeding in the Crustacea, the other major group of arthropods that commonly consume plants, to estimate how often plant feeding has arisen and to test whether this dietary transition is associated with higher species numbers in extant clades. We present evidence that at least 31 lineages of marine, freshwater, and terrestrial crustaceans (including 64 families and 185 genera) have independently overcome the challenges of consuming plant material. These plant-feeding clades are, on average, 21-fold more speciose than their sister taxa, indicating that a shift in diet is associated with increased net rates of diversification. In contrast to herbivorous insects, most crustaceans have very broad diets, and the increased richness of taxa that include plants in their diet likely results from access to a novel resource base rather than host-associated divergence.

  5. Reversible anti-settlement activity against Amphibalanus (= Balanus ) amphitrite, Bugula neritina , and Hydroides elegans by a nontoxic pharmaceutical compound, mizolastine

    KAUST Repository

    Zhou, Xiaojian

    2009-11-01

    Mizolastine, an antihistamine pharmaceutical, was found to significantly inhibit larval settlement of the barnacle Amphibalanus (=Balanus) amphitrite, the bryozoan Bugula neritina, and the polychaete Hydroides elegans with EC50 values of 4.2, 11.2, and 4.1 mg ml-1, respectively. No toxicity against the larvae of these three species was observed at the concentration range tested during incubations with mizolastine. To determine whether the anti-settlement activity of mizolastine is reversible, recovery bioassays using these three species were conducted. More than 70% of the larvae that had been exposed for 4 h to mizolastine at concentrations four-fold greater than their respective EC50 values completed normal metamorphosis. The results of the recovery bioassay provide evidence that the antisettlement effect of mizolastine is reversible in addition to being nontoxic. The anti-settlement activities of several intermediates of the synthesis process of mizolastine were also examined. One of the intermediates, 2-chloro-1-(4- fluorobenzyl)-1H-benzo[d]imidazole, inhibited larval settlement and metamorphosis with low toxicity. These results may improve the understanding of the key functional group responsible for the anti-settlement activity of mizolastine. © 2009 Taylor & Francis.

  6. Supplementary Material for: Transcriptome and proteome dynamics in larvae of the barnacle Balanus Amphitrite from the Red Sea

    KAUST Repository

    Chandramouli, Kondethimmanahalli

    2015-01-01

    Abstract Background The barnacle Balanus amphitrite is widely distributed in marine shallow and tidal waters, and has significant economic and ecological importance. Nauplii, the first larval stage of most crustaceans, are extremely abundant in the marine zooplankton. However, a lack of genome information has hindered elucidation of the molecular mechanisms of development, settlement and survival strategies in extreme marine environments. We sequenced and constructed the genome dataset for nauplii to obtain comprehensive larval genetic information. We also investigated iTRAQ-based protein expression patterns to reveal the molecular basis of nauplii development, and to gain information on larval survival strategies in the Red Sea marine environment. Results A nauplii larval transcript dataset, containing 92,117 predicted open reading frames (ORFs), was constructed and used as a reference for the proteome analysis. Genes related to translation, oxidative phosphorylation and cytoskeletal development were highly abundant. We observed remarkable plasticity in the proteome of Red Sea larvae. The proteins associated with development, stress responses and osmoregulation showed the most significant differences between the two larval populations studied. The synergistic overexpression of heat shock and osmoregulatory proteins may facilitate larval survival in intertidal habitats or in extreme environments. Conclusions We presented, for the first time, comprehensive transcriptome and proteome datasets for Red Sea nauplii. The datasets provide a foundation for future investigations focused on the survival mechanisms of other crustaceans in extreme marine environments.

  7. Crescimento relativo de Macrobrachium acanthurus (Wiegmann, 1836 (Crustacea, Decapoda, Palaemonidae

    Directory of Open Access Journals (Sweden)

    Wagner Cotroni Valenti

    1989-04-01

    Full Text Available In this paper, the relative growth of Macrobrachium acanthurus (Wiegmann, 1836 (Crustacea, Decapoda, Palaemonidae, is presented; the cephalothorax length/abdominal length, telson length/abdominal length and abdominal length/total length relashionships were determined. The adjusted equations showed a isometric growth pattern. There are no changes in these relationships during the animals growth that may be significant in the maximization of the meat's profit.

  8. The Mode of Action of Isocyanide in Three Aquatic Organisms, Balanus amphitrite, Bugula neritina and Danio rerio

    KAUST Repository

    Zhang, Yi-Fan

    2012-09-18

    Isocyanide is a potential antifouling compound in marine environments. In this study, we investigated its mode of action in three aquatic organisms. Two of them, the bryozoan Bugula neritina and the barnacle Balanus amphitrite, are major marine fouling invertebrates, and the other organism is the non-target species zebrafish Danio rerio. In the swimming larvae of B. neritina, isocyanide did not affect the total attachment rate (≤50 µg ml^(−1)), but it did change the attachment site by increasing the percentage of attachment on the bottom of the container rather than on the wall or air-water inter-surface. Isocyanide binds several proteins in B. neritina as identified via SDS-PAGE-LC-MS/MS: 1) a 30 kD protein band containing two proteins similar to voltage dependent anion channels (VDAC), which control the direct coupling of the mitochondrial matrix to the energy maintenance of the cytosol and the release of apoptogenic factors from mitochondria of mammalian cells; and 2) an unknown 39 kD protein. In B. amphitrite cyprids, the isocyanide binding protein were 1) a protein similar to NADH-ubiquinone oxidoreductase, which is the “entry enzyme” of oxidative phosphorylation in mitochondria; and 2) cytochrome P450. In Danio rerio embryos, isocyanide caused “wavy” notochords, hydrocephalus, pericardial edema, poor blood circulation, and defects in pigmentation and hematopoiesis, which phenocopied copper deficiency. This is the first report on isocyanide binding proteins in fouling organisms, as well as the first description of its phenotype and potential toxicology in zebrafish.

  9. iTRAQ-Based Proteomic Profiling of the Barnacle Balanus amphitrite in Response to the Antifouling Compound Meleagrin

    KAUST Repository

    Han, Zhuang

    2013-05-03

    Marine biofouling refers to the unwanted accumulation of fouling organisms, such as barnacles, on artificial surfaces, resulting in severe consequences for marine industries. Meleagrin is a potential nontoxic antifoulant that is isolated from the fungus Penicillium sp.; however, its mechanistic effect mode of action on larval settlement remains unknown. Here, we applied iTRAQ coupled with 2D LC-MS/MS proteomic analysis to investigate the effect of meleagrin on the proteomic expression profile of cyprid development and aging in the barnacle Balanus amphitrite. Fifty proteins were differentially expressed in response to treatment with meleagrin, among which 26 proteins were associated with cyprid development/aging and 24 were specifically associated with the meleagrin treatment. The 66 proteins that were associated with aging only remained unaltered during exposure to meleagrin. Using KEGG analysis, those proteins were assigned to several groups, including metabolic pathways, ECM-receptor interactions, and the regulation of the actin cytoskeleton. Among the 24 proteins that were not related to the development/aging process, expression of the cyprid major protein (CMP), a vitellogenin-like protein, increased after the meleagrin treatment, which suggested that meleagrin might affect the endocrine system and prevent the larval molting cycle. With the exception of the chitin binding protein that mediates the molting process and ATPase-mediated energy processes, the majority of proteins with significant effects in previous studies in response to cyprid treatment with butenolide and polyether B remained unchanged in the present study, suggesting that meleagrin may exhibit a different mechanism. © 2013 American Chemical Society.

  10. Transcriptomic analysis of neuropeptides and peptide hormones in the barnacle Balanus amphitrite: evidence of roles in larval settlement.

    Directory of Open Access Journals (Sweden)

    Xing-Cheng Yan

    Full Text Available The barnacle Balanus amphitrite is a globally distributed marine crustacean and has been used as a model species for intertidal ecology and biofouling studies. Its life cycle consists of seven planktonic larval stages followed by a sessile juvenile/adult stage. The transitional processes between larval stages and juveniles are crucial for barnacle development and recruitment. Although some studies have been conducted on the neuroanatomy and neuroactive substances of the barnacle, a comprehensive understanding of neuropeptides and peptide hormones remains lacking. To better characterize barnacle neuropeptidome and its potential roles in larval settlement, an in silico identification of putative transcripts encoding neuropeptides/peptide hormones was performed, based on transcriptome of the barnacle B. amphitrite that has been recently sequenced. Potential cleavage sites andstructure of mature peptides were predicted through homology search of known arthropod peptides. In total, 16 neuropeptide families/subfamilies were predicted from the barnacle transcriptome, and 14 of them were confirmed as genuine neuropeptides by Rapid Amplification of cDNA Ends. Analysis of peptide precursor structures and mature sequences showed that some neuropeptides of B. amphitrite are novel isoforms and shared similar characteristics with their homologs from insects. The expression profiling of predicted neuropeptide genes revealed that pigment dispersing hormone, SIFamide, calcitonin, and B-type allatostatin had the highest expression level in cypris stage, while tachykinin-related peptide was down regulated in both cyprids and juveniles. Furthermore, an inhibitor of proprotein convertase related to peptide maturation effectively delayed larval metamorphosis. Combination of real-time PCR results and bioassay indicated that certain neuropeptides may play an important role in cypris settlement. Overall, new insight into neuropeptides/peptide hormones characterized in

  11. The mode of action of isocyanide in three aquatic organisms, Balanus amphitrite, Bugula neritina and Danio rerio.

    Directory of Open Access Journals (Sweden)

    Yi-Fan Zhang

    Full Text Available Isocyanide is a potential antifouling compound in marine environments. In this study, we investigated its mode of action in three aquatic organisms. Two of them, the bryozoan Bugula neritina and the barnacle Balanus amphitrite, are major marine fouling invertebrates, and the other organism is the non-target species zebrafish Danio rerio. In the swimming larvae of B. neritina, isocyanide did not affect the total attachment rate (≤50 µg ml(-1, but it did change the attachment site by increasing the percentage of attachment on the bottom of the container rather than on the wall or air-water inter-surface. Isocyanide binds several proteins in B. neritina as identified via SDS-PAGE-LC-MS/MS: 1 a 30 kD protein band containing two proteins similar to voltage dependent anion channels (VDAC, which control the direct coupling of the mitochondrial matrix to the energy maintenance of the cytosol and the release of apoptogenic factors from mitochondria of mammalian cells; and 2 an unknown 39 kD protein. In B. amphitrite cyprids, the isocyanide binding protein were 1 a protein similar to NADH-ubiquinone oxidoreductase, which is the "entry enzyme" of oxidative phosphorylation in mitochondria; and 2 cytochrome P450. In Danio rerio embryos, isocyanide caused "wavy" notochords, hydrocephalus, pericardial edema, poor blood circulation, and defects in pigmentation and hematopoiesis, which phenocopied copper deficiency. This is the first report on isocyanide binding proteins in fouling organisms, as well as the first description of its phenotype and potential toxicology in zebrafish.

  12. Transcriptomic analysis of neuropeptides and peptide hormones in the barnacle Balanus amphitrite: evidence of roles in larval settlement.

    KAUST Repository

    Yan, Xing-Cheng

    2012-10-02

    The barnacle Balanus amphitrite is a globally distributed marine crustacean and has been used as a model species for intertidal ecology and biofouling studies. Its life cycle consists of seven planktonic larval stages followed by a sessile juvenile/adult stage. The transitional processes between larval stages and juveniles are crucial for barnacle development and recruitment. Although some studies have been conducted on the neuroanatomy and neuroactive substances of the barnacle, a comprehensive understanding of neuropeptides and peptide hormones remains lacking. To better characterize barnacle neuropeptidome and its potential roles in larval settlement, an in silico identification of putative transcripts encoding neuropeptides/peptide hormones was performed, based on transcriptome of the barnacle B. amphitrite that has been recently sequenced. Potential cleavage sites andstructure of mature peptides were predicted through homology search of known arthropod peptides. In total, 16 neuropeptide families/subfamilies were predicted from the barnacle transcriptome, and 14 of them were confirmed as genuine neuropeptides by Rapid Amplification of cDNA Ends. Analysis of peptide precursor structures and mature sequences showed that some neuropeptides of B. amphitrite are novel isoforms and shared similar characteristics with their homologs from insects. The expression profiling of predicted neuropeptide genes revealed that pigment dispersing hormone, SIFamide, calcitonin, and B-type allatostatin had the highest expression level in cypris stage, while tachykinin-related peptide was down regulated in both cyprids and juveniles. Furthermore, an inhibitor of proprotein convertase related to peptide maturation effectively delayed larval metamorphosis. Combination of real-time PCR results and bioassay indicated that certain neuropeptides may play an important role in cypris settlement. Overall, new insight into neuropeptides/peptide hormones characterized in this study shall

  13. Transcriptomic Analysis of Neuropeptides and Peptide Hormones in the Barnacle Balanus amphitrite: Evidence of Roles in Larval Settlement

    Science.gov (United States)

    Yan, Xing-Cheng; Chen, Zhang-Fan; Sun, Jin; Matsumura, Kiyotaka; Wu, Rudolf S. S.; Qian, Pei-Yuan

    2012-01-01

    The barnacle Balanus amphitrite is a globally distributed marine crustacean and has been used as a model species for intertidal ecology and biofouling studies. Its life cycle consists of seven planktonic larval stages followed by a sessile juvenile/adult stage. The transitional processes between larval stages and juveniles are crucial for barnacle development and recruitment. Although some studies have been conducted on the neuroanatomy and neuroactive substances of the barnacle, a comprehensive understanding of neuropeptides and peptide hormones remains lacking. To better characterize barnacle neuropeptidome and its potential roles in larval settlement, an in silico identification of putative transcripts encoding neuropeptides/peptide hormones was performed, based on transcriptome of the barnacle B. amphitrite that has been recently sequenced. Potential cleavage sites andstructure of mature peptides were predicted through homology search of known arthropod peptides. In total, 16 neuropeptide families/subfamilies were predicted from the barnacle transcriptome, and 14 of them were confirmed as genuine neuropeptides by Rapid Amplification of cDNA Ends. Analysis of peptide precursor structures and mature sequences showed that some neuropeptides of B. amphitrite are novel isoforms and shared similar characteristics with their homologs from insects. The expression profiling of predicted neuropeptide genes revealed that pigment dispersing hormone, SIFamide, calcitonin, and B-type allatostatin had the highest expression level in cypris stage, while tachykinin-related peptide was down regulated in both cyprids and juveniles. Furthermore, an inhibitor of proprotein convertase related to peptide maturation effectively delayed larval metamorphosis. Combination of real-time PCR results and bioassay indicated that certain neuropeptides may play an important role in cypris settlement. Overall, new insight into neuropeptides/peptide hormones characterized in this study shall

  14. Inhibition of fouling by animal growth - a study using wood constituents. Hemmung von tierischem Aufwuchs - ein Ansatz unter Verwendung von Holzinhaltsstoffen

    Energy Technology Data Exchange (ETDEWEB)

    Shukla, S.K.

    1983-01-01

    Inhibitory effects of constituents from Dalbergia retusa, Tectona grandis and Lophira procera heartwoods on fouling were studied in field and laboratory tests and compared with a copper paint. Lophira extract impaired fouling by barnacles and tubeworms, R-4 methoxydalbergione, obtusaquinone and lapachol didn't. Lapachol proved to be more effective than R-4 methoxydalbergione and obtusaquinone against Balanus improvisus in LD/sub 50/-tests. Maximum inhibition of /sup 45/Ca and /sup 14/C uptake in the shell of Balanus improvisus was caused by lapachol. The same trend was observed in studies on alkaline phosphatase of mantel.

  15. Levels of chromium contamination in the estuary of the Iraja river (Guanabara Bay) and experimental incorporation of 51Cr in barnacles (Balanus sp)

    International Nuclear Information System (INIS)

    Weerelt, M.D.M.V.

    1982-01-01

    Levels were determined of chromium contamination in the estuary of Iraja River, produced by an electroplating industry located 3 km upstream the study area. Uptake-and release kinetics of Cr(VI) and Cr(III) in barnacles (Balanus sp.) were studied. Samples of barnacles and suspended particles from Guanabara Bay were analysed. Chromium concentrations (dry weight) ranged from not detectable (ND) to 154,66 μg/g for soft tissues and from ND to 423,76 μg/g for suspended particles. Mean of maximum concentrations of chromium in samples from Guanabara Bay are 3 and 4 times above those of identical samples from control area (Coroa Grande). Soft tissues presented a concentration factor (CF) of 10 3 related to chromium available in suspended particles. 51 Cr(VI) is preferentiably incorparated by soft tissues (biological half life being 100 days). Chromium uptake by Balanus sp from solution is as significant as it is from particulate matter available in sea water from experimental sets. CF for Cr(VI) in soft tissues in laboratory conditions was 10 2 related to 51 Cr present in sea water. Environmental chromium contamination was found to be of the same order of magnitude or above levels reported for other areas subjected to industrial impacts. Barnacles appear to be able to accumulate chromium in soft tissues from the available metal in the environment. Cr(VI) is the critical form, being greatly accumulated in soft tissues of barnacles, that act as a long-term integrator of this metal. For Cr(III), this organism can only be regarded as an instantaneous indicator of environmental contamination of chromium attached to suspended particles. (M.A.) [pt

  16. Cladocera (Crustacea: Branchiopoda) of Sabah state in Borneo Island, Malaysia.

    Science.gov (United States)

    Sinev, Artem Y; Yusoff, Fatimah M

    2015-08-19

    Fauna of Cladocera (Crustacea: Branchiopoda) of Sabah state of Malaysia, Borneo Island, was evaluated for the first time. Samples from 40 locations were studied, and 31 species of Cladocera were revealed, including three species of Sididae, one species of Daphnidae, one species of Moinidae, four species of Macrothricidae, two species of Ilyocryptidae, and 20 species of Chydoridae. One species of Ilyocryptidae, Ilyocryptus yooni Jeong, Kotov and Lee, 2012, is recorded for Malaysia for the first time, and one more, Anthalona sp., is probably new for science. Of 31 species recorded for Sabah, only three are true planktonic species and 28 are substrate-associated species. Absence of large natural lakes, habitats with most rich cladoceran fauna, can be an important factor limiting diversity of Cladocera in Sabah.

  17. Changes in ventilation and locomotion of Gammarus pulex (Crustacea, Amphipoda) in response to low concentrations of pharmaceuticals

    NARCIS (Netherlands)

    Lange, de H.J.; Peeters, E.T.H.M.; Lürling, M.F.L.L.W.

    2009-01-01

    Exposure to contaminants below lethal concentrations may affect the performance of organisms, resulting in measurable differences in behavior. We measured the response of the benthic invertebrate Gammarus pulex (Crustacea, Amphipoda) to sublethal concentrations of three pharmaceuticals, fluoxetine,

  18. Hydrodynamic properties of some pelagic Crustacea from the North-Equatorial gulfstream

    NARCIS (Netherlands)

    Spaargaren, D.H.

    1980-01-01

    Measurements on underwater weight, weight in air and terminal sinking rate were collected using 8 different species of pelagic Crustacea from the North-Equatorial Gulfstream. From these data (1) animal density, (2) shape constant, determining frictional resistance at terminal sinking velocity and

  19. Toxicity of Zinc, Copper and Lead to Idotea baltica (Crustacea, Isopoda)

    OpenAIRE

    BAT, Levent; SEZGİN, Murat; GÜNDOĞDU, Ayşe; ÇULHA, Mehmet

    2014-01-01

    The acute toxicity of zinc, copper and lead to the marine invertebrate Idotea baltica (Crustacea, Isopoda) was evaluated by static bioassays, calculating the LT 50 (lethality time for 50%) for males and females. Survival time decreased with increasing concentrations of zinc, copper and lead. Zinc was more toxic to Idotea than copper and lead. Lead was the least toxic of the metals tested.

  20. A new fresh-water prawn of the genus Macrobrachium (Crustacea Decapoda, Caridea) from Madagascar

    NARCIS (Netherlands)

    Holthuis, L.B.

    1965-01-01

    Due to the kindness of Mr. Y. Therezien, Ingénieur-hydrobiologiste of the Centre Technique Forestier Tropical at Tananarive, Madagascar, the Rijksmuseum van Natuurlijke Historie received at several occasions freshwater Crustacea from Madagascar. Two previous reports (Holthuis, 1964, 1965) dealt with

  1. Distribution of Mysidium integrum (Tattersall) (Crustacea-mysidacea) in Venezuelan coral habitats

    NARCIS (Netherlands)

    Zoppi de Roa, Evelyn; Pedro Alonso, G.

    1997-01-01

    ZOPPI DE ROA, EVELYN & PEDRO ALONSO G.: Distribution of Mysidium integrum (Tattersall) (Crustacea: Mysidacea) in Venezuelan coral habitats. Studies Nat. Hist. Caribbean Region 73, Amsterdam 1997: 55-62. This paper reports the occurrence, distribution and some ecological aspects of mysids in six

  2. The effect of butenolide on behavioral and morphological changes in two marine fouling species, the barnacle Balanus amphitrite and the bryozoan Bugula neritina

    KAUST Repository

    Zhang, Yi Fan

    2011-05-23

    Butenolide [5-octylfuran-2(5H)-one] is a very promising antifouling compound. Here, the effects of butenolide on larval behavior and histology are compared in two major fouling organisms, viz. cypris larvae of Balanus amphitrite and swimming larvae of Bugula neritina. Butenolide diminished the positive phototactic behavior of B. amphitrite (EC50=0.82 μg ml(-1)) and B. neritina (EC50=3 μg ml(-1)). Its effect on the attachment of cyprids of B. amphitrite was influenced by temperature, and butenolide increased attachment of larvae of B. neritina to the bottom of the experimental wells. At concentrations of 4 μg ml(-1) and 10 μg ml(-1), butenolide decreased attachment of B. amphitrite and B. neritina, respectively, but the effects were reversible within a certain treatment time. Morphologically, butenolide inhibited the swelling of secretory granules and altered the rough endoplasmic reticulum (RER) in the cement gland of B. amphitrite cyprids. In B. neritina swimming larvae, butenolide reduced the number of secretory granules in the pyriform-glandular complex.

  3. Construction of an adult barnacle (Balanus amphitrite cDNA library and selection of reference genes for quantitative RT-PCR studies

    Directory of Open Access Journals (Sweden)

    Burgess J Grant

    2009-06-01

    Full Text Available Abstract Background Balanus amphitrite is a barnacle commonly used in biofouling research. Although many aspects of its biology have been elucidated, the lack of genetic information is impeding a molecular understanding of its life cycle. As part of a wider multidisciplinary approach to reveal the biogenic cues influencing barnacle settlement and metamorphosis, we have sequenced and annotated the first cDNA library for B. amphitrite. We also present a systematic validation of potential reference genes for normalization of quantitative real-time PCR (qRT-PCR data obtained from different developmental stages of this animal. Results We generated a cDNA library containing expressed sequence tags (ESTs from adult B. amphitrite. A total of 609 unique sequences (comprising 79 assembled clusters and 530 singlets were derived from 905 reliable unidirectionally sequenced ESTs. Bioinformatics tools such as BLAST, HMMer and InterPro were employed to allow functional annotation of the ESTs. Based on these analyses, we selected 11 genes to study their ability to normalize qRT-PCR data. Total RNA extracted from 7 developmental stages was reverse transcribed and the expression stability of the selected genes was compared using geNorm, BestKeeper and NormFinder. These software programs produced highly comparable results, with the most stable gene being mt-cyb, while tuba, tubb and cp1 were clearly unsuitable for data normalization. Conclusion The collection of B. amphitrite ESTs and their annotation has been made publically available representing an important resource for both basic and applied research on this species. We developed a qRT-PCR assay to determine the most reliable reference genes. Transcripts encoding cytochrome b and NADH dehydrogenase subunit 1 were expressed most stably, although other genes also performed well and could prove useful to normalize gene expression studies.

  4. The regulatory role of the NO/cGMP signal transduction cascade during larval attachment and metamorphosis of the barnacle Balanus (=Amphibalanus) amphitrite

    KAUST Repository

    Zhang, Y.

    2012-08-01

    The barnacle Balanus amphitrite is among the most dominant fouling species on intertidal rocky shores in tropical and subtropical areas and is thus a target organism in antifouling research. After being released from adults, the swimming nauplius undertakes six molting cycles and then transforms into a cyprid. Using paired antennules, a competent cyprid actively explores and selects a suitable substratum for attachment and metamorphosis (collectively known as settlement). This selection process involves the reception of exogenous signals and subsequent endogenous signal transduction. To investigate the involvement of nitric oxide (NO) and cyclic GMP (cGMP) during larval settlement of B. amphitrite, we examined the effects of an NO donor and an NO scavenger, two nitric oxide synthase (NOS) inhibitors and a soluble guanylyl cyclase (sGC) inhibitor on settling cyprids. We found that the NO donor sodium nitroprusside (SNP) inhibited larval settlement in a dose-dependent manner. In contrast, both the NO scavenger carboxy-PTIO and the NOS inhibitors aminoguanidine hemisulfate (AGH) and S-methylisothiourea sulfate (SMIS) significantly accelerated larval settlement. Suppression of the downstream guanylyl cyclase (GC) activity using a GC-selective inhibitor ODQ could also significantly accelerate larval settlement. Interestingly, the settlement inhibition effects of SNP could be attenuated by ODQ at all concentrations tested. In the developmental expression profiling of NOS and sGC, the lowest expression of both genes was detected in the cyprid stage, a crucial stage for the larval decision to attach and metamorphose. In summary, we concluded that NO regulates larval settlement via mediating downstream cGMP signaling.

  5. Ecomorfologia de caranguejos e siris (Crustacea Decapoda Brachyura) de ecossistemas costeiros

    OpenAIRE

    Marochi, Murilo Zanetti

    2012-01-01

    Resumo: Ecomorfologia de caranguejos e siris (CRUSTACEA DECAPODA BRACHYURA) de ecossistemas costeiros. O presente estudo objetivou avaliar se diferentes espécies de Brachyura possuem padrões ecomorfológicos em comum ligados ao habitat em que estão inseridas. Foram analisados 528 exemplares pertencentes a 24 espécies e provenientes dos seguintes ecossistemas costeiros: manguezal, costão rochoso, praia arenosa, bentopelagial e mar aberto. De todos os exemplares foram mensurada...

  6. Removal of off-flavours in some Australian crustacea by ionising radiation

    International Nuclear Information System (INIS)

    Freeman, D.J.

    1985-01-01

    Development of an export industry based on the deep sea royal red prawn, haliporoides sibogae and the shallow water shovel nosed lobster or balmain bug, lbacus peronii has been hampered by the sweet garlic off-flavour often encountered in both these species. A method for removing this noxious odour was developed which involved gamma irradiation of the affected crustacea using a cobalt-60 source

  7. Macroepizoísmo em Libinia ferreirae (Crustacea, Brachyura, Majidae Macroepizoites on Libinia ferreirae (Crustacea, Brachyura, Majidae

    Directory of Open Access Journals (Sweden)

    Vanessa C. Winter

    2006-06-01

    Full Text Available Um estudo de distribuição dos macroepizóicos foi realizado numa população do caranguejo-aranha Libinia ferreirae Brito Capello, 1871 proveniente do litoral dos estados do Paraná e de Santa Catarina. O material biológico foi obtido junto aos pescadores, e faz parte do rejeito de pesca. Os caranguejos foram mensurados e os macroepizóicos identificados e contados. Os seguintes macroepizóicos sésseis foram registrados: Calliactis tricolor (Lesueur, 1817 (Cnidaria; Actiniaria (Cnidaria; Arca sp. (Mollusca; Ostreidae (Mollusca; Acanthodesia tenuis (Desor, 1848 (Bryozoa; Cirripedia e duas espécies tubícolas de Gammaridea (Crustacea. Além destes organismos ocorreram dois tubos desabitados e quatro animais vágeis. A anêmona C. tricolor foi a espécie mais abundante e freqüente, sendo, provavelmente, utilizada como mecanismo de camuflagem pelo caranguejo. O macroepizoísmo em L. ferreirae está relacionado com a idade ou tamanho do caranguejo, tendo maior incidência naqueles mais velhos ou de maior porte. Entretanto, a densidade dos macroepizóicos por caranguejo se mantém em torno de três. Não há relação entre o macroepizoísmo e o sexo do hospedeiro; somente fêmeas ovígeras utilizam desse recurso mais freqüentemente do que as não-ovígeras. Devido à maior área de fixação, os macroepizóicos colonizam principalmente a carapaça do caranguejo, enquanto nos pereiópodos há predominância de Bryozoa.A study of the distribution of the macroepizoites was carried out on a population of the spider crab Libinia ferreirae Brito Capello, 1871 from the Southern Brazilian coast. Crabs were obtained from shrimps and fishes by-catch. They were measured, and their macroepizoites were identified and counted. The following sessile macroepizoites were registered: Calliactis tricolor (Lesueur, 1817 (Cnidaria; Actiniaria (Cnidaria; Arca sp. (Mollusca; Ostreidae (Mollusca; Acanthodesia tenuis (Desor, 1848 (Bryozoa; Cirripedia and two species

  8. Endemism in the Cladocera (Crustacea: Branchiopoda of Southern Africa

    Directory of Open Access Journals (Sweden)

    Kay Van Damme

    2013-08-01

    Full Text Available We review the current state of knowledge and patterns of distribution in the endemic Cladocera (Crustacea: Branchiopoda of Southern Africa and describe two species of the Western Cape, of which one is new to science. Frey (1993, Korovchinsky (2006 and Smirnov (2008 previously suggested that South Africa harbours few endemics in the Cladocera. In the current study, we show that so-called low endemism in this region is mainly attributed to our limited state of knowledge of the local cladoceran fauna. Many of the South African taxa are ignored and revisions are lacking, as we briefly discuss for the genus Daphnia. We list known Southern African endemic Cladocera with notes on their status, map the distributions of well-studied taxa, and discuss the importance of temporary freshwater rockpools. We confirm that Southern Africa is a region of endemism for the group. We recognise three categories of endemics: i Montane endemics in the East (e.g. Drakensberg mountains; ii endemics of the Western Cape (lowlands; iii South African endemics, widely distributed in the region, both in the mountains and the lowlands. South African endemics have previously been regarded as relicts (Korovchinsky 2006, yet for the two taxa explored in detail in this study, there are no specific primitive morphological characters in comparison to congeners (within their respective genus/species group and the morphology mainly suggests strong isolation. The two species belong to the Chydoridae and the Eurycercidae, respectively, and are used here as case studies for the investigation of Western Cape endemics. The first, Alona capensis Rühe, 1914 (Anomopoda: Chydoridae: Aloninae, is redescribed based on the type material. We discuss the affinities of this enigmatic species for the first time. Morphology of the habitus and the postabdomen parallel that of members of the Alona affinis-complex. The disconnected head pores and limb characters, on the other hand, place A. capensis in

  9. First Record of Hippa adactyla (Fabricius, 1787; Crustacea, Anomura, Hippidae) from Indonesian Waters.

    Science.gov (United States)

    Ardika, Puji Utari; Farajallah, Achmad; Wardiatno, Yusli

    2015-12-01

    Specimens of Hippa adactyla (Crustacea, Anomura, Hippidae) were collected from several coasts of Indonesia (Sumatera, Java, Bali-Lombok and Sulawesi). This finding represents the first record of this species in Indonesia and confirms its presence in the Indian Ocean and in the Wallacea region. Its systematic and morphological characteristics are described, and its distribution in Indonesia is presented. One of the main characteristics of this species is a median lobe in the anterior part of the carapace, which has 3-4 lobes. Likewise, the left antenna has 2-6 articles.

  10. Fecundidade em Macrobrachium acanthurus (Wiegmann, 1836 do Rio Ribeira de Iguape (Crustacea, Decapoda, Palaemonidae

    Directory of Open Access Journals (Sweden)

    Wagner Cotroni Valenti

    1989-04-01

    Full Text Available In this paper, the fecundity in Macrobrachium acanthurus (Wiegmann, 1836 of the Ribeira de Iguape river (Southern Brazil (Crustacea, Decapoda, Palaemonidae, is presented. The mean individual fecundity of the population was estimated. Fecundity was related to either length and/or weight. Our data showed that this species presents high fecundity and is thus suitable for comercial culture. The fecundity/length and fecundity/weight relationships obtained are: F = - 14 712 + 2 311,8 L and F = -1493,9 + 798,76 W

  11. Removal of garlic-like off-odours from crustacea by gamma irradiation

    International Nuclear Information System (INIS)

    Freeman, D.J.; Izzard, M.E.; Whitfield, F.B.

    1985-01-01

    The strong garlic-like off-odours associated with the male shovel-nosed lobster (Ibacus peronii) and the royal red prawn (Hymenopenaeus sibogae) have been attributed principally to the presence of the sulphur-containing compound bis-(methylthio)-methane. In the male shovel-nosed lobster the concentration of this compound increases very rapidly following death, and a small number of contaminated crustacea may cause an entire consignment to be condemned. A method for removing this noxious odour was developed which involved gamma-irradiation of the affected crustacea using a cobalt-60 source. Eight lobsters were subjected to gamma-irradiation at a dose rate of 10 kGy an hour; one half of each was given a dose of 25 kGy and the other half a dose of 5 kGy. Results showed that a high dose completely removes the existing off-odour, and also prevents its further formation. With the lower dose the off-odour is not completely removed. A trial using fresh royal red prawns at doses of 0.5 and 1.0 kGy showed irradiation removed all traces of the off-odour, but in those irradiated at the higher dose a slight burnt flavour was noticeable

  12. Natural porous and nano fiber chitin structure from Gammarus argaeus (Gammaridae Crustacea)

    Science.gov (United States)

    Kaya, Murat; Tozak, Kabil Özcan; Baran, Talat; Sezen, Göksal; Sargin, Idris

    2013-01-01

    Chitin and its derivatives are commercially important biopolymers due to their applications in medicine, agriculture, water treatment, cosmetics and various biotechnological areas. Since chitin and its derivatives exhibit different chemical and physical properties depending on the source and isolation method, there is a growing demand for new chitin sources other than crab and shrimp worldwide. In this study Gammarus, a Crustacea, was investigated as a novel chitin source. Gammarus, which belongs to the family Gammaridae Crustacea, lives in the bottom of aquatic ecosystems. More than 200 species are known worldwide. One of these species, G. argaeus was investigated for chitin isolation. The alpha chitin isolated from G. argaeus was characterized by using analysis techniques such as infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). All these analyses confirmed that the isolated chitin from G. argaeus was in the alpha form. Furthermore, we described that dry weight of this species contained 11-12 % chitin. SEM examination of the isolated α-chitin revealed that it was composed of nanofibrils (15-55 nm) and pores (about 150 nm). PMID:26966425

  13. First record of Puerulus mesodontus Chan, Ma & Chu, 2013 (Crustacea, Decapoda, Achelata, Palinuridae) from south of Java, Indonesia.

    Science.gov (United States)

    Wardiatno, Yusli; Hakim, Agus Alim; Mashar, Ali; Butet, Nurlisa Alias; Adrianto, Luky; Farajallah, Achmad

    2016-01-01

    Three specimens of Puerulus mesodontus Chan, Ma & Chu, 2013 (Crustacea, Decapoda, Achelata, Palinuridae) were collected from Palabuhanratu Bay, southern Java, Indonesia. There is no previous record on the presence of the species in Indonesia. This finding represents the first record of this species in Java, Indonesia, and confirms that the species is present in the Indian Ocean. The morphological characters of the species are described. This paper contains a new distribution record of a lobster species from Indonesian waters.

  14. Comparative study of cadmium and lead accumulations in Cambarus bartoni (Fab. ) (Decapoda, Crustacea) from an acidic and a neutral lake

    Energy Technology Data Exchange (ETDEWEB)

    Keenan, S.; Alikhan, M.A. (Laurentian Univ., Sudbury, Ontario (Canada))

    1991-07-01

    The purpose of the study reported in this paper was to compare concentrations of lead and cadmium in the sediment and water, as well as in the crayfish, Cambarus Bartoni (Fab.) (Decapoda - Crustacea) trapped from an acidic and a neutral lake in the Sudbury district of Northeastern Ontario. Hepatopancreatic, alimentary canal, tail muscles and exoskeletal concentrations in the crayfish are also examined to determine specific tissue sites for these accumulations.

  15. Population structure and reproductive biology of Mesopodopsis orientalis (Crustacea: Mysida) in a tropical mangrove ecosystem in India

    Digital Repository Service at National Institute of Oceanography (India)

    Biju, A.; Panampunnayil, S.U.

    version: Mar. Biodivers. Rec.: 4(e43); 2011; 9 pp; doi:10.1017/S1755267211000273. Population structure and reproductive biology of Mesopodopsis orientalis (Crustacea: Mysida) in a tropical mangrove ecosystem in India A. Biju *, S.U. Panampunnayil... mangrove habitat. MATERIALS AND METHODS Description of study area Mangroves are salt tolerant forest ecosystem of tropical and subtropical intertidal regions. Where conditions are sheltered and suitable, the mangroves may form extensive and productive...

  16. A new species of portunid crab of the genus Charybdis (De Haan, 1833) (Crustacea: Decapoda: Brachyura) from Goa, India

    Digital Repository Service at National Institute of Oceanography (India)

    Padate, V.P.; Rivonker, C.U.; Anil, A.C.; Sawant, S.S.; Venkat, K.

    within the sub-family Thalamitinae Paulson, 1875, with 63 species (Thalamita Latreille, 1829 comprises 89 species) (Ng et al., 2008) distributed among four sub-genera (Charybdis De Haan, 1833; Goniohellenus Alcock, 1899; Gonioneptunus Ortmann, 1893.... Biol. Res., vol.6(6); 2010; 579-590 A new species of portunid crab of the genus Charybdis (De Haan, 1833) (Crustacea: Decapoda: Brachyura) from Goa, India. VINAY P. PADATE Department of Marine Sciences, Goa University, Goa 403 206, India...

  17. Towards a sustainable human use of freshwater crayfish (Crustacea, Decapoda, Astacidea

    Directory of Open Access Journals (Sweden)

    Gherardi F.

    2011-07-01

    Full Text Available To face the severe loss in biodiversity recorded in freshwater crayfish (Crustacea, Decapoda, Astacidea, there is an increasing awareness that the CBD’s concept of the sustainable use of natural resources should be applied also to this large assemblage of species. This review paper will synthesize the several uses we make or have made of crayfish with the purpose of pinpointing where sustainability is desirable and feasible. Uses are here classified as direct (i.e. consumption and production and indirect. The latter uses refer to the recreational, cultural, ethical, aesthetic, scientific and education values of crayfish. An additional indirect use regards the environmental key role this taxon plays. Several examples, mostly related to Europe, will be provided to illustrate the importance of crayfish to human societies, culture and history. The potential of assigning a non-use value to them will be finally discussed.

  18. Investigations on the metabolism of metals in decapod crustaceas in relation with moulting cycles and reproduction

    International Nuclear Information System (INIS)

    Martin, J.-L.M.

    1975-07-01

    A study of the metabolism of metals was carried out in decapod crustaceas; it showed that it was subject to cyclic variations during the life of the animals, closely correlated with growth moults. The metabolism of metals was also considered in its relations with reproduction, especially oogenesis and spermatogenesis, and embryonic development. In relation with moult, various factors playing a role on metal metabolism were investigated: role of metals in the organism, fasting and nutrition cycles and biochemical reserves, physico-chemical form of the metal and ultrastructure of uptake surfaces. The histological and histochemical aspects of the uptake of a number of metals were studied as well as inter-metallic and inter-organic relationships [fr

  19. Male meiosis in Crustacea: synapsis, recombination, epigenetics and fertility in Daphnia magna.

    Science.gov (United States)

    Gómez, Rocío; Van Damme, Kay; Gosálvez, Jaime; Morán, Eugenio Sánchez; Colbourne, John K

    2016-09-01

    We present the first detailed cytological study of male meiosis in Daphnia (Crustacea: Branchiopoda: Cladocera)-an aquatic microcrustacean with a cyclical parthenogenetic life cycle. Using immunostaining of the testes in Daphnia magna for baseline knowledge, we characterized the different stages of meiotic division and spermiogenesis in relation to the distribution of proteins involved in synapsis, early recombination events and sister chromatid cohesion. We also studied post-translational histone modifications in male spermatocytes, in relation to the dynamic chromatin progression of meiosis. Finally, we applied a DNA fragmentation test to measure sperm quality of D. magna, with respect to levels of inbreeding. As a proxy for fertility, this technique may be used to assess the reproductive health of a sentinel species of aquatic ecosystems. Daphnia proves to be a model species for comparative studies of meiosis that is poised to improve our understanding of the cytological basis of sexual and asexual reproduction.

  20. Atlantorchestoidea brasiliensis (Crustacea: Amphipoda as an indicator of disturbance caused by urbanization of a beach ecosystem

    Directory of Open Access Journals (Sweden)

    Valéria Gomes Veloso

    2010-03-01

    Full Text Available This study analyzed a comparison of the Atlantorchestoidea brasiliensis (Crustacea: Amphipoda density of a preserved area with that of an urbanized one, both on Peró Beach, Cabo Frio, Rio de Janeiro state. Seasonal samplings were conducted of the population of talitrideos and an estimation of the number of swimmers in these areas was made. The lowest frequency of swimmers was recorded in the preserved area regardless of sampling period. In the urbanized area swimmers were most frequent in January (550 individuals/m-1. The statistical tests showed the absence of Atlantorchestoidea brasiliensis in the urban area, indicating that this species is extremely sensitive to the urbanization of beaches. The use of the Talitridae family as an indicator of the impact of urbanization on the ecosystems of sandy beaches is also discussed.Este trabalho é um estudo comparativo da densidade de Atlantorchestoidea brasiliensis (Crustacea: Amphipoda no trecho urbanizado e no trecho preservado da praia do Peró, Cabo Frio, Rio de Janeiro. Foram realizadas coletas sazonais da população de talitrídeos, assim como uma estimativa do número de banhistas nessas áreas. Na área preservada foi registrada a menor freqüência de banhista independente dos períodos amostrados, enquanto que no trecho urbanizado a maior freqüência ocorreu no mês de Janeiro (550 indivíduos/m-1. As análises estatísticas mostraram a ausência de Atlantorchestoidea brasiliensis na área urbanizada em todos os períodos amostrados, indicando que essa espécie é bastante sensível à urbanização das praias. É discutida também a utilização da família Talitridae como indicadora de impactos oriundos dos efeitos de urbanização nos ecossistemas de praias arenosas.

  1. Occurence of the Asian shrimp Palaemon macrodactylus in the Southern bight of the North Sea, with a key to the Palaemonidae of North-western Europe (Crustacea: Decapoda: Caridea)

    NARCIS (Netherlands)

    d'Udekem d'Azoc, C.; Faasse, M.; Dumoulin, E.; Blauwe, de H.

    2005-01-01

    Het voorkomen van de rugstreepsteurgarnaal Palaemon macrodactylus in de zuidelijke bocht van de Noordzee, met een determinatiesleutel tot de Palaemonidae van Noordwest-Europa (Crustacea: Decapoda: Caridea) In 1999 werd de rugstreepsteurgarnaal Palaemon macrodactylus Rathbun, 1902, een soort

  2. Cumacea (Crustacea) from the Seychelles, Maldives, Sri Lanka (western Indian Ocean), and the Red Sea, with the description of six new species

    NARCIS (Netherlands)

    Mühlenhardt-Siegel, Ute

    2000-01-01

    Twenty species of Cumacea (Crustacea: Peracarida) are in the collection from the Seychelles, Sri Lanka, Maldives and the Red Sea, six of them new to science: Bodotria quseirensis n.sp., Budotria corallina n.sp., Cyclaspoides flokkeri n.sp., Cumella praslinensis n.sp., Campylaspis totzkei n.sp., and

  3. Distribution and ecology of Gammarus tigrinus Sexton, 1939 and some other amphipod Crustacea near Beaufort (North Carolina, U.S.A.)

    NARCIS (Netherlands)

    Maren, van Marion J.

    1978-01-01

    During summer 1977 the distribution and ecology of amphipod Crustacea in the coastal plain of north Carolina were studied. Ecological data were collected in particular on Gammarus tigrinus, a North American species, which has been introduced in western Europe. The present gammarid, able to endure

  4. First discovery of porcellanid crab, Porcellanella picta (Crustacea: Decapoda: Porcellanidae, from south-east coast of India

    Directory of Open Access Journals (Sweden)

    Kanagasabapathy Sivasubramanian

    2014-09-01

    Full Text Available Studies of the distribution of any marine organism are very important in determining the range of its expansion in the oceans and to determine the factors influencing this expansion. This study reports for the first time the occurrence of the crab Porcellanella picta (Crustacea, Anomura, Porcellanidae in the Point Calimere coastal region of southeastern India. All the specimens found were sexually mature. This crab occurs only rarely on the Indian coast and this observation expands its known range, recording a second distributional area for the species and significantly extending its range on the southeast coast of India.

  5. Gammaridea (Crustacea-Amphipoda Records from Eskişehir Province and It's Near Around.

    Directory of Open Access Journals (Sweden)

    Mehmet İpek

    2015-12-01

    Full Text Available Eskişehir ili ve yakın çevresinden Gammaridea (Crustacea-Amphipoda kayıtları. Bu çalışmada Eskişehir ve çevresindeki 60 farklı tatlı su kaynağından toplanan Gammaridea örnekleri incelenmiştir. Çalışma sonunda Gammaridae familyasından, Gammarus pulex pulex, Gammarus fossarum, Gammarus pseudanatoliensis, Gammarus balcanicus, Echinogammarus ischnus ve Niphargidae familyasından Niphargus tauri olmak üzere toplam 6 tür saptanmıştır. Niphargus tauri dışındaki türler bölge için yeni kayıttır. Bununla birlikte Echinogammarus ischnus türü ülkemizde ilk kez bir akarsudan kayıt edilmiştir. Tespit edilen türlerin temel taksonomik özellikleri de kısaca verilmiştir

  6. The Hyalella (Crustacea: Amphipoda) species cloud of the ancient Lake Titicaca originated from multiple colonizations.

    Science.gov (United States)

    Adamowicz, Sarah J; Marinone, María Cristina; Menu-Marque, Silvina; Martin, Jeffrey W; Allen, Daniel C; Pyle, Michelle N; De Los Ríos, Patricio; Sobel, Crystal N; Ibañez, Carla; Pinto, Julio; Witt, Jonathan D S

    2018-03-12

    Ancient lakes are renowned for their exceptional diversity of endemic species. As model systems for the study of sympatric speciation, it is necessary to understand whether a given hypothesized species flock is of monophyletic or polyphyletic origin. Here, we present the first molecular characterization of the Hyalella (Crustacea: Amphipoda) species complex of Lake Titicaca, using COI and 28S DNA sequences, including samples from the connected Small and Large Lakes that comprise Lake Titicaca as well as from a broader survey of southern South American sites. At least five evolutionarily distant lineages are present within Lake Titicaca, which were estimated to have diverged from one another 12-20 MYA. These major lineages are dispersed throughout the broader South American Hyalella phylogeny, with each lineage representing at least one independent colonization of the lake. Moreover, complex genetic relationships are revealed between Lake Titicaca individuals and those from surrounding water bodies, which may be explained by repeated dispersal into and out of the lake, combined with parallel intralacustrine diversification within two separate clades. Although further work in deeper waters will be required to determine the number of species present and modes of diversification, our results strongly indicate that this amphipod species cloud is polyphyletic with a complex geographic history. Copyright © 2018 Elsevier Inc. All rights reserved.

  7. Paleocene decapod Crustacea from northeastern Mexico: Additions to biostratigraphy and diversity

    Science.gov (United States)

    Martínez-Díaz, José Luis; Aguillón-Martínez, Martha Carolina; Luque, Javier; Vega, Francisco J.

    2017-03-01

    New decapod specimens from mid-Paleocene shallow marine deposits of NE Mexico represents an important addition to the diversity, paleobiogeography and evolution of the Crustacea record. In this work, we describe additions to the decapod assemblage from the Paleocene (Selandian) Rancho Nuevo Formation (Difunta Group, Parras Basin, Coahuila). Due to the evident size differences with other decapod assemblages, we compare the new assemblage with those from the Lower Paleocene (Danian) Mexia Clay Member of the Wills Point Formation, Texas, and the Lower Eocene (Ypresian) El Bosque Formation in Chiapas. Species reported from the mid-Paleocene (Selandian) assemblage of the Porters Creek Formation (Alabama), are correlatable to the decapod species from NE Mexico in age, size and systematic composition. The erymid lobster Enoploclytia gardnerae (Rathbun, 1935) is represented by several carapaces and chelae remains. One isolated palm of Callianassidae is included. Numerous carapaces of Linuparus wilcoxensis Rathbun, 1935 are described, representing the most abundant lobster. A new record for the raninid Notopoides sp., and presence of Quasilaeviranina sp. cf. arzignagnensis and Quasilaeviranina ovalis are here reported. New raninids, Claudioranina latacantha sp. nov. and Claudioranina sp. (Cyrtorhininae) are also part of this assemblage. Paraverrucoides alabamensis (Rathbun, 1935), and Tehuacana americana (Rathbun, 1935) are represented by several carapaces exhibiting intraspecific morphological variation. Different sizes among the Early and Middle Paleocene and Early Eocene decapod populations suggests a possible effect of variation in seawater temperatures and/or a Lilliput effect after the K/Pg event.

  8. The amazing diversity of the genus Monospilus Sars, 1862 (Crustacea: Branchiopoda: Aloninae) in South America.

    Science.gov (United States)

    Sousa, Francisco Diogo R; Elmoor-Loureiro, Lourdes M A; Panarelli, Eliana A

    2017-03-13

    The main goal of this paper is to describe three new species of the genus Monospilus Sars, 1862 (Crustacea: Cladocera). Monospilus macroerosus sp. nov. differs from other species of the genus in several peculiar morphological traits, the most striking being the presence of a saw-shaped pecten of teeth on the postabdominal claw. This species inhabits semiterrestrial habitats (wet leaf litter on hydromorphic soil from gallery forest), exhibiting adaptations related to movement and food handling in this type of habitat. Monospilus brachyspinus sp. nov. inhabits truly aquatic habitats, where lives being associated with macrophytes and submerged leaves. It may be recognized by the postabdominal claw, which is armed with proximal spinulae modified in a short spine. In Monospilus sp., the proximal spinulae are modified in a long and slender spine. So far, Monospilus sp. occurs in southern South America, while Monospilus macroerosus sp. nov. and Monospilus brachyspinus sp. nov. occur in the Cerrado biome in Brazil, in the central portion of South America. Some conclusions about the conservation status of new species also are made.

  9. Studies on transfer and accumulation of 106Ru from seaweed to fish through crustacea, 2

    International Nuclear Information System (INIS)

    Izumo, Yoshiro

    1982-01-01

    This paper deals with transfer and accumulation of 106 Ru in a model of the graizing food chain of marine organisms: the radioactive sea water → seaweed (Chondrus crispus) → crustacea (prawn, Palaemon serratus) → fish (plaice, Pleuronectes platessa). The seaweeds were cultured in the radioactive sea waters A (filtrated and circulated through sandy mud, the radioactive concentration decreased and atteined to constant after addition of 106 Ru), B (not filtrated and circulated, the radioactive concentration decreased and atteined to constant) and C (not filtrated and circulated, the radioactive concentration decreased, but did not attein to constant), respectively, and investigated accumulations of 106 Ru. Thereafter, accumulations of 106 Ru in prawns and plaice by the ingestions of their diets (the seaweeds contaminated with 106 Ru in each water and the meats of prawns accumulated 106 Ru from each diet, respectively), were investigated and compared with those from the radioactive sea waters reported previously. It was shown that 106 Ru would be accumulated by the prawns from the sea water A about 3 times higher than from the contaminated diet in this water, however from the contaminated diets in the waters B and C about 2 times, respectively, higher than from each water. While, accumulations of 106 Ru by the plaice from each diet were negligible in comparison with those from each water. No higher concentrations of 106 Ru were observed in these organisms from lower to higher in the trophic level. (author)

  10. Structure and Ultrastructure of the Endodermal Region of the Alimentary Tract in the Freshwater Shrimp Neocaridina heteropoda (Crustacea, Malacostraca).

    Science.gov (United States)

    Sonakowska, Lidia; Włodarczyk, Agnieszka; Poprawa, Izabela; Binkowski, Marcin; Śróbka, Joanna; Kamińska, Karolina; Kszuk-Jendrysik, Michalina; Chajec, Łukasz; Zajusz, Bartłomiej; Rost-Roszkowska, Magdalena Maria

    2015-01-01

    The freshwater shrimp Neocaridina heteropoda (Crustacea, Malacostraca, Decapoda) originates from Asia and is one of the species that is widely available all over the world because it is the most popular shrimp that is bred in aquaria. The structure and the ultrastructure of the midgut have been described using X-ray microtomography, transmission electron microscopy, light and fluorescence microscopes. The endodermal region of the alimentary system in N. heteropoda consists of an intestine and a hepatopancreas. No differences were observed in the structure and ultrastructure of males and females of the shrimp that were examined. The intestine is a tube-shaped organ and the hepatopancreas is composed of two large diverticles that are divided into the blind-end tubules. Hepatopancreatic tubules have three distinct zones - proximal, medial and distal. Among the epithelial cells of the intestine, two types of cells were distinguished - D and E-cells, while three types of cells were observed in the epithelium of the hepatopancreas - F, B and E-cells. Our studies showed that the regionalization in the activity of cells occurs along the length of the hepatopancreatic tubules. The role and ultrastructure of all types of epithelial cells are discussed, with the special emphasis on the function of the E-cells, which are the midgut regenerative cells. Additionally, we present the first report on the existence of an intercellular junction that is connected with the E-cells of Crustacea.

  11. Structure and Ultrastructure of the Endodermal Region of the Alimentary Tract in the Freshwater Shrimp Neocaridina heteropoda (Crustacea, Malacostraca.

    Directory of Open Access Journals (Sweden)

    Lidia Sonakowska

    Full Text Available The freshwater shrimp Neocaridina heteropoda (Crustacea, Malacostraca, Decapoda originates from Asia and is one of the species that is widely available all over the world because it is the most popular shrimp that is bred in aquaria. The structure and the ultrastructure of the midgut have been described using X-ray microtomography, transmission electron microscopy, light and fluorescence microscopes. The endodermal region of the alimentary system in N. heteropoda consists of an intestine and a hepatopancreas. No differences were observed in the structure and ultrastructure of males and females of the shrimp that were examined. The intestine is a tube-shaped organ and the hepatopancreas is composed of two large diverticles that are divided into the blind-end tubules. Hepatopancreatic tubules have three distinct zones - proximal, medial and distal. Among the epithelial cells of the intestine, two types of cells were distinguished - D and E-cells, while three types of cells were observed in the epithelium of the hepatopancreas - F, B and E-cells. Our studies showed that the regionalization in the activity of cells occurs along the length of the hepatopancreatic tubules. The role and ultrastructure of all types of epithelial cells are discussed, with the special emphasis on the function of the E-cells, which are the midgut regenerative cells. Additionally, we present the first report on the existence of an intercellular junction that is connected with the E-cells of Crustacea.

  12. Benthic Crustacea from tropical and temperate reef locations: differences in assemblages and their relationship with habitat structure

    Science.gov (United States)

    Kramer, Michael J.; Bellwood, David R.; Taylor, Richard B.; Bellwood, Orpha

    2017-09-01

    Tropical and temperate marine habitats have long been recognised as fundamentally different system, yet comparative studies are rare, particularly for small organisms such as Crustacea. This study investigates the ecological attributes (abundance, biomass and estimated productivity) of benthic Crustacea in selected microhabitats from a tropical and a temperate location, revealing marked differences in the crustacean assemblages. In general, microhabitats from the tropical location (dead coral, the epilithic algal matrix [algal turfs] and sand) supported high abundances of small individuals (mean length = 0.53 mm vs. 0.96 mm in temperate microhabitats), while temperate microhabitats (the brown seaweed Carpophyllum sp., coralline turf and sand) had substantially greater biomasses of crustaceans and higher estimated productivity rates. In both locations, the most important microhabitats for crustaceans (per unit area) were complex structures: tropical dead coral and temperate Carpophyllum sp. It appears that the differences between microhabitats are largely driven by the size and relative abundance of key crustacean groups. Temperate microhabitats have a higher proportion of relatively large Peracarida (Amphipoda and Isopoda), whereas tropical microhabitats are dominated by small detrital- and microalgal-feeding crustaceans (harpacticoid copepods and ostracods). These differences highlight the vulnerability of tropical and temperate systems to the loss of complex benthic structures and their associated crustacean assemblages.

  13. Protein Aggregation Formed by Recombinant cp19k Homologue of Balanus albicostatus Combined with an 18 kDa N-Terminus Encoded by pET-32a(+ Plasmid Having Adhesion Strength Comparable to Several Commercial Glues.

    Directory of Open Access Journals (Sweden)

    Chao Liang

    Full Text Available The barnacle is well known for its tenacious and permanent attachment to a wide variety of underwater substrates, which is accomplished by synthesizing, secreting and curing a mixture of adhesive proteins termed "barnacle cement". In order to evaluate interfacial adhesion abilities of barnacle cement proteins, the cp19k homologous gene in Balanus albicostatus (Balcp19k was cloned and expressed in Escherichia coli. Here, we report an intriguing discovery of a gel-like super adhesive aggregation produced by Trx-Balcp19k, a recombinant Balcp19k fusion protein. The Trx-Balcp19k consists of an 18 kDa fragment at the N-terminus, which is encoded by pET-32a(+ plasmid and mainly comprised of a thioredoxin (Trx tag, and Balcp19k at the C-terminus. The sticky aggregation was designated as "Trx-Balcp19k gel", and the bulk adhesion strength, biochemical composition, as well as formation conditions were all carefully investigated. The Trx-Balcp19k gel exhibited strong adhesion strength of 2.10 ± 0.67 MPa, which was approximately fifty folds higher than that of the disaggregated Trx-Balcp19k (40 ± 8 kPa and rivaled those of commercial polyvinyl acetate (PVA craft glue (Mont Marte, Australia and UHU glue (UHU GmbH & Co. KG, Germany. Lipids were absent from the Trx-Balcp19k gel and only a trace amount of carbohydrates was detected. We postulate that the electrostatic interactions play a key role in the formation of Trx-Balcp19k gel, by mediating self-aggregation of Trx-Balcp19k based on its asymmetric distribution pattern of charged amino acids. Taken together, we believe that our discovery not only presents a promising biological adhesive with potential applications in both biomedical and technical fields, but also provides valuable paradigms for molecular design of bio-inspired peptide- or protein-based materials.

  14. Crustacea; Talitridae

    African Journals Online (AJOL)

    where temperature fluctuations were highest and per cent moisture lowest. However, gravid females preferred slightly deeper soil layers. Studies during a spring and a neap tide indicated that the animals have a Circadian rhythm with a nocturnal activity phase, and a weak tidal rhythm, but no lunar orientation mechanism.

  15. Crustacea: Branchiura

    African Journals Online (AJOL)

    Fryer 1977). Both the Groot Berg and Tra- tra Rivers are in the south-west Cape region. During fish parasitological surveys in the northern Trans- vaal, two female and one male specimen of Chonopeltis were collected from the gill chamber of the ...

  16. Crustacea; Talitridae

    African Journals Online (AJOL)

    The traps were checked every 2 h for 12 h and the tidal level and moon. 18.7.83. 21.8.83. 100m. 150-200m. Figure 1 Kite diagrams to show the horizontal and temporal distribution patterns for T. capensis at Sundays River beach during 1983, where. A = high-water mark; B = boundary of cobbles and slack; C = front of slack; ...

  17. Arthropoda. Crustacea

    NARCIS (Netherlands)

    Böhm, Joh.

    1909-01-01

    Die mehrfach unterbrochene Kette tertiärer und jüngerer vulkanischer Gesteine, welche Java der Länge nach durchzieht, wird nordwärts und südwärts sowie in den Lücken von tertiären und quartären Ablagerungen eingerahmt ¹). Kreideformation und hoch krystalline Schiefer treten ganz vereinzelt und auf

  18. Crustacea, lsopoda

    African Journals Online (AJOL)

    1998-02-02

    Feb 2, 1998 ... The deposition of metals from the atmosphere and resulting accumulation in terres- trial ecosystems is a well-known phenomenon (Tyler (972),. It is also known that certain metals damage various organ- isms. On an ecosystem level, pollution of soils can arise. ITom aerial deposition from sources such as ...

  19. Cell Death in the Epithelia of the Intestine and Hepatopancreas in Neocaridina heteropoda (Crustacea, Malacostraca.

    Directory of Open Access Journals (Sweden)

    Lidia Sonakowska

    Full Text Available The endodermal region of the digestive system in the freshwater shrimp Neocaridina heteropoda (Crustacea, Malacostraca consists of a tube-shaped intestine and large hepatopancreas, which is formed by numerous blind-ended tubules. The precise structure and ultrastructure of these regions were presented in our previous studies, while here we focused on the cell death processes and their effect on the functioning of the midgut. We used transmission electron microscopy, light and confocal microscopes to describe and detect cell death, while a quantitative assessment of cells with depolarized mitochondria helped us to establish whether there is the relationship between cell death and the inactivation of mitochondria. Three types of the cell death were observed in the intestine and hepatopancreas-apoptosis, necrosis and autophagy. No differences were observed in the course of these processes in males and females and or in the intestine and hepatopancreas of the shrimp that were examined. Our studies revealed that apoptosis, necrosis and autophagy only involves the fully developed cells of the midgut epithelium that have contact with the midgut lumen-D-cells in the intestine and B- and F-cells in hepatopancreas, while E-cells (midgut stem cells did not die. A distinct correlation between the accumulation of E-cells and the activation of apoptosis was detected in the anterior region of the intestine, while necrosis was an accidental process. Degenerating organelles, mainly mitochondria were neutralized and eventually, the activation of cell death was prevented in the entire epithelium due to autophagy. Therefore, we state that autophagy plays a role of the survival factor.

  20. Cell Death in the Epithelia of the Intestine and Hepatopancreas in Neocaridina heteropoda (Crustacea, Malacostraca).

    Science.gov (United States)

    Sonakowska, Lidia; Włodarczyk, Agnieszka; Wilczek, Grażyna; Wilczek, Piotr; Student, Sebastian; Rost-Roszkowska, Magdalena Maria

    2016-01-01

    The endodermal region of the digestive system in the freshwater shrimp Neocaridina heteropoda (Crustacea, Malacostraca) consists of a tube-shaped intestine and large hepatopancreas, which is formed by numerous blind-ended tubules. The precise structure and ultrastructure of these regions were presented in our previous studies, while here we focused on the cell death processes and their effect on the functioning of the midgut. We used transmission electron microscopy, light and confocal microscopes to describe and detect cell death, while a quantitative assessment of cells with depolarized mitochondria helped us to establish whether there is the relationship between cell death and the inactivation of mitochondria. Three types of the cell death were observed in the intestine and hepatopancreas-apoptosis, necrosis and autophagy. No differences were observed in the course of these processes in males and females and or in the intestine and hepatopancreas of the shrimp that were examined. Our studies revealed that apoptosis, necrosis and autophagy only involves the fully developed cells of the midgut epithelium that have contact with the midgut lumen-D-cells in the intestine and B- and F-cells in hepatopancreas, while E-cells (midgut stem cells) did not die. A distinct correlation between the accumulation of E-cells and the activation of apoptosis was detected in the anterior region of the intestine, while necrosis was an accidental process. Degenerating organelles, mainly mitochondria were neutralized and eventually, the activation of cell death was prevented in the entire epithelium due to autophagy. Therefore, we state that autophagy plays a role of the survival factor.

  1. Biogeography of Crustacea and Mollusca of the Subantarctic and Antarctic regions

    Directory of Open Access Journals (Sweden)

    Angelika Brandt

    1999-12-01

    Full Text Available The Joint Magellan Victor Hensen Campaign in 1994 focused on the biogeographic relationships of the Antarctic and Magellan fauna. The Peracarida and Mollusca sampled at 18 stations in the Beagle Channel by means of an epibenthic sledge were compared with the knowledge about the distribution of species data from the Falkland Islands, South Georgia, Antarctica and the Kerguelen. Peracarida were an important fraction of the macrobenthos and sampled in high numbers. About 105,000 individuals were collected with the epibenthic sledge. Until now about 40 species of Amphipoda, about 42 species of Isopoda, 24 species of Cumacea, eight species of Mysidacea, and 16 species of Tanaidacea were found. 118 mollusc taxa were identified, nine species of Aplacophora, 52 of Gastropoda, five of Scaphopoda and 52 of Bivalvia. Although the species present different distribution trends, the zoogeographic comparison for six larger taxa (four Mollusca and two Peracarida showed that the species similarities decreased from the Magellan region towards the Falkland Islands and from South Georgia to Antarctica. The Magellanic Gastropoda showed similarities with the fauna of the Falkland Islands and South Georgia (31-37 %, whereas the Bivalvia were more similar to the Antarctic fauna (29 %. With regard to Crustacea, 10% of Antarctic Isopoda species were also found in the Magellan region; the Weddell Sea and East Antarctica, and South Georgia and the Antarctic Peninsula shared most species of both Cumacea and Isopoda, whereas the lowest similarities were shown between Bellingshausen and Weddell Sea for the Isopoda, and interestingly between the Magellan region and South Georgia for the Cumacea. The highest degree of endemism of the Isopoda and Cumacea was found in the Magellan region, where as a consequence of the opening of the Drake Passage many new species seem to have evolved in these taxa.

  2. Two new species and one newly recorded species of the genus Kamaka (Crustacea: Amphipoda) from the Hainan Province, South China Sea.

    Science.gov (United States)

    Ren, Xian-qiu; Sha, Zhong-li

    2013-01-01

    A total of 5 species of the genus Kamaka (Crustacea: Amphipoda) are identified from Hainan Province, South China Sea. In those, one species, Kamaka excavata Ariyama, 2007, is recorded for the first time in Chinese waters. Two new species, Kamaka corophina sp. n. and Kamaka foliacea sp. n., are described. A key to the Chinese species is provided. They were collected from littoral zone, mud flat in seaweed of mangrove side, brackish water and seawater, sifted out with sieve.

  3. The testosterone metabolism of the estuarine invertebrate Neomysis integer (Crustacea: Mysidacea): Identification of testosterone metabolites and endogenous vertebrate-type steroids

    OpenAIRE

    Verslycke, T.; De Wasch, K.; De Brabander, H.F.; Janssen, C.R.

    2002-01-01

    Testosterone metabolism by Neomysis integer (Crustacea; Mysidacea) was assessed to obtain initial data on its metabolic capacity. N. integer were exposed to both testosterone and [14]testosterone. Identification of testosterone metabolites and endogenous steroids was performed using thin-layer chromatography and liquid chromatography with multiple mass spectrometry. Endogenous production of testosterone in mysids was detected for the first time. N. integer were exposed to testosterone and met...

  4. Metamorphosis in the cirripede crustacean Balanus amphitrite

    DEFF Research Database (Denmark)

    Maruzzo, Diego; Aldred, Nick; Clare, Anthony S.

    2012-01-01

    Stalked and acorn barnacles (Cirripedia Thoracica) have a complex life cycle that includes a free-swimming nauplius larva, a cypris larva and a permanently attached sessile juvenile and adult barnacle. The barnacle cyprid is among the most highly specialized of marine invertebrate larvae and its ...

  5. Composition and distribution of selected munnopsid genera (Crustacea, Isopoda, Asellota) in Icelandic waters

    Science.gov (United States)

    Schnurr, Sarah; Brandt, Angelika; Brix, Saskia; Fiorentino, Dario; Malyutina, Marina; Svavarsson, Jörundur

    2014-02-01

    The Greenland-Scotland Ridge (GSR) is a major topographic feature, extending from Greenland to Scotland. It constrains the water exchange between the northernmost North Atlantic Ocean and the Greenland, Iceland and Norwegian Seas (GIN Seas) and thus forms a potential barrier for faunal exchange from the Arctic to the North Atlantic (and vice versa). Recently an increase in Atlantic water inflow has been observed, leading to changes in physical parameters (i.e. temperature and salinity), which may have an impact on the resident fauna. In this study, we analyzed the composition and distribution of six selected genera of the isopod family Munnopsidae (Crustacea) occurring north and south of the GSR. We examined 82 epibenthic sledge samples and 26 additional sub-samples taken in the course of the Benthic Invertebrates of Icelandic Waters (BIOICE) and Icelandic Marine Animals: Genetics and Ecology (IceAGE) projects, respectively, covering a total depth range from 103 to 2752 m depth. Overall, 58 of the evaluated stations originated in the area north of the GSR, while the remaining 50 samples were collected south of the ridge. In total, 10517 individuals could be assigned to 15 species, most belonging to the genus EurycopeSars, 1864. Due to the presence of the GSR as well as differences in the environment, we expected significant dissimilarities in faunal composition between the two study areas. However, most species (8) occurred on both sides of the ridge, while four species were restricted to the region north of Iceland, and three to the region south of the ridge. Depth (or factors related to depth) appeared to be the most important factor in driving distributional patterns of the studied species. Temperature was also an important driver, but not to the same extent as depth. On the contrary, salinity and sediment type did not have much influence on munnopsid distribution patterns. Hence, the presence of the ridge does not restrict faunal exchange between the northern

  6. Estudios sobre los Entomostráceos de Colombia.V. Limnadia Orinoquiensis, una nueva especie de la familia Limnadiidae Sars, 1896 (Arthropoda, Crustacea, Conchostraca Estudios sobre los Entomostráceos de Colombia.V. Limnadia Orinoquiensis, una nueva especie de la familia Limnadiidae Sars, 1896 (Arthropoda, Crustacea, Conchostraca

    Directory of Open Access Journals (Sweden)

    Roessler Ewald W.

    1991-06-01

    Full Text Available En el presente estudio se describen rasgos morfológicos de una nueva especie colombiana del género Limnadia Brongniart, 1820, Limnadia orinoquiensis (Arthropoda, Crustacea, Conchostraca. La forma es de reproducción bisexual y típica para las aguas ácidas y oscuras de los alrededores de Puerto Inírida, Comisaria del Guainía. The present study describes morfological features of a new colombian species of the genus Limnadia Brongniart, 1820, Limnadia orinoquiensis (Arthropoda, Crustacea, Conchostraca, a species of bisexual reproduction, typical to the dark waters of temporary pools in the surroundings of Puerto Inírida, Comisaria of Guainía.

  7. Exceptionally well-preserved giant spermatozoa in male and female specimens of an ostracod Cypria ophtalmica (Crustacea: Ostracoda) from Late Glacial lacustrine sediments of Southern Carpathians, Romania

    Science.gov (United States)

    Iepure, Sanda; Namiotko, Tadeusz; Valdecasas, Antonio G.; Magyari, Enikö K.

    2012-07-01

    Exceptionally well-preserved giant spermatozoa observed between abundant decalcified carapace valves of ostracods (Crustacea: Ostracoda) were found in Late Glacial to Holocene (14,400 to 10,000 cal years bp) lacustrine sediments in the southern Romanian Carpathians. Analysis by scanning electron microscopy and laser scanning confocal microscopy revealed good preservation of the appendages enabling specific identification as Cypria ophtalmica (Candonidae) and indication of the presence of both female and male specimens based on the sexual dimorphism of the second antenna. This record represents the oldest and richest direct evidence of virtually morphologically unaltered animal spermatozoa preserved in females after mating.

  8. OCORRÊNCIA DE Macrobrachium amazonicum (CRUSTACEA, DECAPODA) NA DIETA DE Lysapsus bolivianus (ANURA, HYLIDAE).

    OpenAIRE

    Mayara Fabiana Melo Furtado; Carlos Eduardo Costa-Campos; Suelique Souza Queiroz; Kelly Juliana Gaya Correa; Inacia Maria Vieira

    2013-01-01

    A dieta de Lysapsus bolivianus está baseada principalmente em pequenos artrópodes, representados geralmente por Diptera, Collembola e Hemiptera, sendo os crustáceos encontrados ocasionalmente. No presente trabalho registramos a presença de Macrobrachium amazonicum na dieta de L. bolivianus em planície de Inundação no Norte do Brasil. Palavras-chave: dieta, Crustacea, Amazônia Oriental. DOI: http://dx.doi.org/10.18561/2179-5746/biotaamazonia.v3n3p185-187

  9. Evaluation of the haematological parameters in Piaractus mesopotamicus Holmberg (Osteichthyes, Characidae with Argulus sp. (Crustacea, Branchiura infestation and treatment with organophosphate

    Directory of Open Access Journals (Sweden)

    Marcos Tavares-Dias

    1999-06-01

    Full Text Available Haematological parameters as erythrocytes, leukocytes and plasma glucose in Piaractus mesopotamicus Holmberg, 1887 were analyzed. Fish were parasitized with Argulus sp. (Crustacea, Branchiura and treated with 0.4 mg of thriclorphon 500/L water. The effects of parasitism and the action of the treatment were evaluated. Parasitized fish showed greater number of monocytes (P>0.05 and special granulocitic cells (P0.05. Organophosphate treatment presented significantly reduction (P>0.05 in red blood cells (RBC and hemoglobin.

  10. Oldest record of Mathildellidae (Crustacea: Decapoda: Goneplacoidea) associated with Retroplumidae from the Upper Cretaceous of NE Mexico

    Science.gov (United States)

    Vega, Francisco J.; Ahyong, Shane T.; Espinosa, Belinda; Flores-Ventura, José; Luna, Laura; González-González, Arturo H.

    2018-03-01

    A new genus and species of the Mathildellidae Prebranchioplax cretacica (Crustacea: Decapoda: Goneplacoidea) is reported from shallow marine sediments of the upper Campanian Parras Shale and Cerro del Pueblo Formation (Parras Basin), Coahuila, NE Mexico. Prebranchioplax cretacica was collected from siliceous concretions associated with more abundant specimens of the retroplumid Costacopluma mexicana Vega and Perrilliat, 1989. P. cretacica bears similarities to Eocene species of Branchioplax from Japan, USA (Alaska and Washington), England, Hungary and Tajikistan as well as with Eogeryonidae (Portunoidea) species from the Upper Cretaceous of Spain and Marocarcinidae (Styracocarcinus) from Morocco. However, clear differences in the carapace frontal shape places P. cretacica in the Mathildellidae. This record represents the oldest known Mathildellidae, and along with the Retroplumidae, appear to have originated during the Late Cretaceous in ancient seas of Mexico, with a wide distribution during Paleogene times becoming restricted today to deep waters of the Indo-Pacific region and Atlantic Ocean. Comments on preservation and morphology of Costacopluma mexicana are also included. Crab specimens preserved in siliceous concretions from one locality (Entronque) show peculiar desiccation marks, and a possible model of taphonomy.

  11. Lunar-rhythmic molting in laboratory populations of the noble crayfish Astacus astacus (Crustacea, Astacidea: an experimental analysis.

    Directory of Open Access Journals (Sweden)

    Robert Franke

    Full Text Available Juvenile noble crayfish, Astacusastacus (Crustacea, Astacidea in the second year of age were kept in the laboratory for a twelve-month period under continuing "summer conditions" (LD 16:8, 19°C. Molting processes in this population could be synchronized by artificial moonlight cycles. Peaks of exuviations occurred at "new moons". Males showed a slightly higher degree of synchronization than females. A phase-shift of the artificial lunar cycle in relation to the natural cycle resulted in a corresponding shift of the molting cycle. This clearly demonstrates that changes in the nocturnal light regime provide the primary external information for the lunar-monthly molting rhythm. There is a first indication that lunar photic stimuli do not act directly but as a zeitgeber which entrains an endogenous molting rhythm to the lunar cycle. Moreover, the results of the long-term experiments suggest that the hibernal resting period of A. astacus in the field (no molts between October and April may also involve some endogenous programming. Continuing artificial summer conditions can delay but not completely suppress this resting period. The adaptive significance of the phenomena and how the findings may be applied to improve the management of crowded crayfish stocks are discussed.

  12. INFLUÊNCIA DA ALIMENTAÇÃO NA TAXA DE SOBREVIVÊNCIA E DESENVOLVIMENTO DE Notodiaptomus cearensis WRIGHT, 1936 (CRUSTACEA: COPEPODA E Physiocypria schubarti FARKAS, 1958 (CRUSTACEA: OSTRACODA

    Directory of Open Access Journals (Sweden)

    Fabiana Rodrigues de Arruda Câmara

    2014-08-01

    Full Text Available Os grupos zooplanctônico Copepoda e Ostracoda são constituídos por espécies que apresentam dominância em ecossistemas eutrofizados. O presente estudo baseado em ensaios experimentais teve como objetivo testar a sobrevivência, crescimento e desenvolvimento das espécies Notodiaptomus cearensis Wright, 1936 (Crustacea: Copepoda Calanoida e Physiocypria schubarti Farkas, 1958 (Crustacea: Ostracoda e interpretar a respeito das relações existentes entre Copepoda e Ostracoda. Dois testes experimentais foram realizados, utilizando a água bruta do reservatório Armando Ribeiro Gonçalves (ARG, Assú, Rio Grande do Norte. Para o primeiro ensaio, a espécie Ceriodaphnia dubia foi utilizada como organismo-teste a fim de verificar sua tolerância à toxicidade presumida na água bruta do reservatório e auxiliar nas explicações relacionadas ao crescimento e desenvolvimento de Copepoda e Ostracoda. O segundo teste foi conduzido utilizando as espécies N. cearensis e P. schubarti com o objetivo de verificar uma possível competição por recursos. Os resultados demonstraram uma correlação inversa entre as biomassas de Copepoda Calanoida e Ostracoda no reservatório Armando Ribeiro Gonçalves. Dois tipos de crescimento padrão foram observados: Ostracoda, P. schubarti apresenta taxa de crescimento relativamente constante independentemente do tipo de alimento oferecido, enquanto que Copepoda calanoida, N. cearensis, embora demonstre crescimento satisfatório quando alimentado com cianobactérias filamentosas, apresenta preferência por algas verdes. Portanto, os resultados não apoiam a hipótese de competição por alimento entre as espécies, levando em consideração a ampla variação sazonal de N. cearensis e P. schubarti e sua eventual coexistência na coluna d’água. P. schubarti não afeta o crescimento de N. cearensis, e a redução na densidade de N. cearensis ocorre devido a fatores inerentes à incapacidade de sobrevivência desta esp

  13. An overview of the distribution of the Parabathynellidae (Crustacea, Syncarida Bathynellacea on the Iberian Peninsula and Balearic Islands

    Directory of Open Access Journals (Sweden)

    Camacho, Ana I.

    2003-06-01

    Full Text Available This paper reviews all the knowledge on the presence and distribution of 26 species of the family Parabathynellidae Noodt, 1964 (Crustacea, Syncarida, Bathynellacea on the Iberian Peninsula and Balearic Islands. The different genera, subgenera and species distributions are subjected to a basic analysis. The presence of these taxa in different subterranean aquatic habitats (caves, springs, wells and interstitial environment is also discussed. The most sampled habitat was the interstitial environment (45%; the least sampled habitat was springs (5%. The most commonly found genus was Iberobathynella Schminke, 1973 (54% and the rarest was Guadalopebathynella Camacho & Serban, 1998 (0.7% All the knowledge on these taxa in the study area, in Europe and in the world is compared and evaluated. More species of the Parabathynellidae live on the Iberian Peninsula and Balearic Islands than in any other part of the world (26 species. Iberobathynella is a highly diversified genus endemic to the Iberian peninsula. Its diversity is comparable to another genus in the order, Hexabathynella Schminke, 1972, which also has 18 described species. However, Hexabathynella has a cosmopolitan distribution.

    En este trabajo se reúne y actualiza el conocimiento acerca de la presencia y distribución de 26 especies de batinelas de la familia Parabathynellidae (Crustacea, Syncarida, Bathynellacea en la Península Ibérica y las Islas Baleares. Se analiza de forma crítica la distribución de los diferentes géneros, subgéneros y especies y se discute acerca de la presencia de los mismos en diferentes habitat acuáticos subterráneos (cuevas, fuentes o surgencias, pozos y medio intersticial asociado a ríos epigeos. El mayor número de puntos de muestreo corresponde al medio intersticial (45% del total y en él se encuentran los cinco géneros presentes en el área de estudio; las surgencias constituyen el conjunto con menos puntos de

  14. Işıklı Gölü ve Kaynaklarının (Çivril-Denizli Crustacea Faunası.

    Directory of Open Access Journals (Sweden)

    Cem Aygen

    2015-12-01

    Full Text Available Bu çalışmada, Işıklı Gölü Crustacea faunasının taksonomik açıdan incelenmesi hedeflenmiştir. Bu amaçla Şubat 1998-Ocak 1999 ayları arasında, gölde ve göle akan kaynak bölgesinde belirlenen 6 istasyondan aylık periyotlarla biyolojik örnekler ve su örnekleri alınmıştır. Araştırma sonunda Işıklı Gölü ve Kaynağı’nda bulunan Crustacea faunasının başlıca Cladocera (16 tür, Copepoda (12 tür, Ostracoda (1 tür, Amphipoda (2 tür, Isopoda (1 tür, Mysidacea (1 tür ve Decapoda (1 tür gruplarından oluştuğu saptanmıştır. Tespit edilen türlerden Cladocera grubundan Diaphanosoma brachyurum, Diaphanosoma mongolianum, Ceriodaphnia pulchella, Simocephalus vetulus, Macrothrix laticornis, Alona rectangula, Alona guttata, Graptoleberis testudinaria, Leydigia leydigi, Biapertura affinis, Chydorus sphaericus, Pleuroxus aduncus ve Disparalona rostrata; Copepoda grubundan Macrocyclops albidus, Eucyclops serrulatus, Eucyclops speratus, Eucyclops macruroides, Metacyclops gracilis, Mesocyclops leuckarti, Cyclops vicinus, Cyclops abyssorum, Cyclops strenuus, Megacyclops viridis, Acanthocyclops robustus, Canthocamptus staphylinus; Ostracoda grubundan Psychrodromus olivaceus; Amphipoda grubundan Gammarus balcanicus, Gammarus obnixus; Isopoda grubundan Asellus aquaticus türleri Işıklı Gölü’nden ilk kez bildirilmektedir

  15. Brain architecture of the largest living land arthropod, the Giant Robber Crab Birgus latro (Crustacea, Anomura, Coenobitidae: evidence for a prominent central olfactory pathway?

    Directory of Open Access Journals (Sweden)

    Krieger Jakob

    2010-09-01

    Full Text Available Abstract Background Several lineages within the Crustacea conquered land independently during evolution, thereby requiring physiological adaptations for a semi-terrestrial or even a fully terrestrial lifestyle. Birgus latro Linnaeus, 1767, the giant robber crab or coconut crab (Anomura, Coenobitidae, is the largest land-living arthropod and inhabits Indo-Pacific islands such as Christmas Island. B. latro has served as a model in numerous studies of physiological aspects related to the conquest of land by crustaceans. From an olfactory point of view, a transition from sea to land means that molecules need to be detected in gas phase instead of in water solution. Previous studies have provided physiological evidence that terrestrial hermit crabs (Coenobitidae such as B. latro have a sensitive and well differentiated sense of smell. Here we analyze the brain, in particular the olfactory processing areas of B. latro, by morphological analysis followed by 3 D reconstruction and immunocytochemical studies of synaptic proteins and a neuropeptide. Results The primary and secondary olfactory centers dominate the brain of B. latro and together account for ca. 40% of the neuropil volume in its brain. The paired olfactory neuropils are tripartite and composed of more than 1,000 columnar olfactory glomeruli, which are radially arranged around the periphery of the olfactory neuropils. The glomeruli are innervated ca. 90,000 local interneurons and ca. 160,000 projection neurons per side. The secondary olfactory centers, the paired hemiellipsoid neuropils, are targeted by the axons of these olfactory projection neurons. The projection neuron axonal branches make contact to ca. 250.000 interneurons (per side associated with the hemiellipsoid neuropils. The hemiellipsoid body neuropil is organized into parallel neuropil lamellae, a design that is quite unusual for decapod crustaceans. The architecture of the optic neuropils and areas associated with antenna two

  16. Brain architecture of the largest living land arthropod, the Giant Robber Crab Birgus latro (Crustacea, Anomura, Coenobitidae): evidence for a prominent central olfactory pathway?

    Science.gov (United States)

    2010-01-01

    Background Several lineages within the Crustacea conquered land independently during evolution, thereby requiring physiological adaptations for a semi-terrestrial or even a fully terrestrial lifestyle. Birgus latro Linnaeus, 1767, the giant robber crab or coconut crab (Anomura, Coenobitidae), is the largest land-living arthropod and inhabits Indo-Pacific islands such as Christmas Island. B. latro has served as a model in numerous studies of physiological aspects related to the conquest of land by crustaceans. From an olfactory point of view, a transition from sea to land means that molecules need to be detected in gas phase instead of in water solution. Previous studies have provided physiological evidence that terrestrial hermit crabs (Coenobitidae) such as B. latro have a sensitive and well differentiated sense of smell. Here we analyze the brain, in particular the olfactory processing areas of B. latro, by morphological analysis followed by 3 D reconstruction and immunocytochemical studies of synaptic proteins and a neuropeptide. Results The primary and secondary olfactory centers dominate the brain of B. latro and together account for ca. 40% of the neuropil volume in its brain. The paired olfactory neuropils are tripartite and composed of more than 1,000 columnar olfactory glomeruli, which are radially arranged around the periphery of the olfactory neuropils. The glomeruli are innervated ca. 90,000 local interneurons and ca. 160,000 projection neurons per side. The secondary olfactory centers, the paired hemiellipsoid neuropils, are targeted by the axons of these olfactory projection neurons. The projection neuron axonal branches make contact to ca. 250.000 interneurons (per side) associated with the hemiellipsoid neuropils. The hemiellipsoid body neuropil is organized into parallel neuropil lamellae, a design that is quite unusual for decapod crustaceans. The architecture of the optic neuropils and areas associated with antenna two suggest that B. latro has

  17. Brain architecture of the largest living land arthropod, the Giant Robber Crab Birgus latro (Crustacea, Anomura, Coenobitidae): evidence for a prominent central olfactory pathway?

    Science.gov (United States)

    Krieger, Jakob; Sandeman, Renate E; Sandeman, David C; Hansson, Bill S; Harzsch, Steffen

    2010-09-10

    Several lineages within the Crustacea conquered land independently during evolution, thereby requiring physiological adaptations for a semi-terrestrial or even a fully terrestrial lifestyle. Birgus latro Linnaeus, 1767, the giant robber crab or coconut crab (Anomura, Coenobitidae), is the largest land-living arthropod and inhabits Indo-Pacific islands such as Christmas Island. B. latro has served as a model in numerous studies of physiological aspects related to the conquest of land by crustaceans. From an olfactory point of view, a transition from sea to land means that molecules need to be detected in gas phase instead of in water solution. Previous studies have provided physiological evidence that terrestrial hermit crabs (Coenobitidae) such as B. latro have a sensitive and well differentiated sense of smell. Here we analyze the brain, in particular the olfactory processing areas of B. latro, by morphological analysis followed by 3 D reconstruction and immunocytochemical studies of synaptic proteins and a neuropeptide. The primary and secondary olfactory centers dominate the brain of B. latro and together account for ca. 40% of the neuropil volume in its brain. The paired olfactory neuropils are tripartite and composed of more than 1,000 columnar olfactory glomeruli, which are radially arranged around the periphery of the olfactory neuropils. The glomeruli are innervated ca. 90,000 local interneurons and ca. 160,000 projection neurons per side. The secondary olfactory centers, the paired hemiellipsoid neuropils, are targeted by the axons of these olfactory projection neurons. The projection neuron axonal branches make contact to ca. 250.000 interneurons (per side) associated with the hemiellipsoid neuropils. The hemiellipsoid body neuropil is organized into parallel neuropil lamellae, a design that is quite unusual for decapod crustaceans. The architecture of the optic neuropils and areas associated with antenna two suggest that B. latro has visual and

  18. Seasonal fluctuations of some biological traits of the invader Caprella scaura (Crustacea: Amphipoda: Caprellidae in the Mar Piccolo of Taranto (Ionian Sea, southern Italy

    Directory of Open Access Journals (Sweden)

    Ermelinda Prato

    2013-03-01

    Full Text Available Caprella scaura is an epifaunal amphipod crustacean that originates in the western Indian Ocean and has spread throughout the world, but very little is known about fundamental aspects of its biology. This paper is the first presentation of its life history traits in an invaded region. The study was conducted in the Mar Piccolo basin (southern Italy, Ionian Sea, over a one-year period. All biological parameters showed a strong seasonal pattern, breeding peaked twice during the year and the number of eggs in the ventral brood pouch ranged from 5 to 72. The sex ratio was generally close to 1:1. A strong correlation between total length of ovigerous females and number of eggs was observed. The mean length of both mature males and mature females was 10.63 and 7.70 mm, respectively. The results of this study showed that the population dynamics of this species was not dissimilar to that of other caprellids or marine epifaunal Crustacea. This caprellid has given rise to a stable population in the Mar Piccolo; it was present all year round in the study area but its density suggests that it is not yet a strong invader.

  19. On the biogeography of Cumacea (Crustacea, Malacostraca. A comparison between South America, the Subantarctic Islands and Antarctica: present state of the art

    Directory of Open Access Journals (Sweden)

    Ute Mühlenhardt-Siegel

    1999-12-01

    Full Text Available Cumacea (Crustacea were collected during the Joint Magellan expedition in November 1994, by means of an epibenthic sledge from RV Victor Hensen. The cumaceans were well represented, the second abundant order after the amphipods, among the other Peracarida in depth ranges between 25 and 665 m. Twenty-five species were found in the samples mainly from the Beagle Channel, nine of them were already known for this region. 14 species were recorded for the first time for this region, 2 of them were known from the northern Argentinian coast and one from Antarctica. The most important in terms of species richness and abundance were the families Diastylidae, Nannastacidae and Leuconidae. In the Beagle Channel an almost completely different cumacean fauna was found compared to the Subantarctic Islands, the Antarctic Peninsula and eastern Antarctic (Prydz Bay regions. Comparison of published data and the present results show moderate overlap in the cumacean fauna at the species level between the periantarctic South Georgian shelf / Antarctic Peninsula (48%. Little correspondence at the species level was found between Antarctica / Subantarctic Kerguelen (14 %, South Georgia / Kerguelen (13 % and Magellan / Antarctica (11 %. Interestingly, the Magellan region and South Georgia show very little species overlap (5 %. It is concluded that the Antarctic shelf regions were not colonized from the Magellan region via the Scotia Arc.

  20. On the presence of the Mediterranean endemic Microdeutopus sporadhi Myers, 1969 (Crustacea: Amphipoda: Aoridae in the Gulf of Naples (Italy with a review on its distribution and ecology

    Directory of Open Access Journals (Sweden)

    M. B. SCIPIONE

    2013-10-01

    Full Text Available The species Microdeutopus sporadhi (Crustacea: Amphipoda: Aoridae, endemic of the Mediterranean Sea, was described by Myers in 1969 on material collected from the Aegean Sea in a sheltered environment with high sedimentation rates. A check on the distribution and ecology of M. sporadhi showed that: — although not mentioned in the checklist of amphipods of the Italian seas, it was already found in the central Tyrrhenian Sea in 1983-84 and in the northern Adriatic Sea in 2002-03; — it was rarely found in the Mediterranean Sea, one of the most studied basins as concerns amphipod fauna; but notwithstanding the few records available, the wide ecological spectrum of this species was pointed out. The present study, conducted off the Island of Ischia (Gulf of Naples, Italy, showed the presence of rich and well established populations through time, but only in a peculiar substratum (artificial collectors and environment (low pH values. The species seems to be able to withstand harsh environmental conditions and probably to conceal itself through a cryptic behaviour, escaping traditional sampling methods. The role of rare or hidden species in bio-assessment should be re-evaluated.

  1. Studies on some ecological aspects of Balanus amphitrite (Cirripedia: Thoracica)

    Digital Repository Service at National Institute of Oceanography (India)

    Desai, D.V.

    of phytoplankton blooms will be important in the reproductive and recruitment ecology of this organism. The observations of self-fertilization in this species indicate that crowding may not be an essential requirement for successful reproduction in this species...

  2. Starvation threshold of Balanus amphitrite larvae in relation to temperature

    Digital Repository Service at National Institute of Oceanography (India)

    Anil, A.C.; Desai, D.V.

    naupliar instars and the influence of the different environmental stresses that regulate it. From the antifouling assay perspective, it is also important to produce cyprids at energy level that mimic the stock in nature. In pursuit of this gobal...

  3. Influence of bacterial exopolymers and the adult extract of Balanus amphitrite and Cthamalus sp. on cyprid metamorphosis of Balanus amphitrite

    Digital Repository Service at National Institute of Oceanography (India)

    Anil, A.C.; Khandeparker, L.; Mitbavkar, S.; Wagh, A.B.

    Settlement of barnacle, a major fouling organism is believed to be controlled to a great extent by substratum characteristics such as, presence of conspecific adults or "gregariousness" inducing factors. Exopolymers secreted by bacteria can also...

  4. CRUSTACEA: DECAPODA: THALASSINIDEA

    African Journals Online (AJOL)

    50 per cent in C. australiensis. This high rate of recruitment indicates low larval mortality and demon- strates the numerical success of the loss of the planktonic phase (Forbes 1973b) and the adoption of a non-pelagic lecithotrophic form of larval ...

  5. Stomatopod Crustacea of Suriname

    NARCIS (Netherlands)

    Holthuis, L.B.

    1959-01-01

    The present report is based in the first place on material collected by the trawler “Coquette”, which, from April to August 1957, explored the offshore waters of Suriname and French Guiana from the mouth of the Nickerie River in the west to the Iles de Salut in the east. Most of the hauls were made

  6. (Crustacea) from Verlorenvlei

    African Journals Online (AJOL)

    1994-08-29

    Aug 29, 1994 ... Two preliminary surveys (one during the dry season and one during the wet season) of the ostracod fauna of. Verlorenvlei (Western Cape) are presented. Fifteen species were found; two are reported for the first time from. Africa. Various species are indicative of slightly saline to even hypersaline conditions.

  7. Heterotremata, Brachyura, Crustacea

    African Journals Online (AJOL)

    1992-05-26

    v) the elongate condition of at least one of the two centrioles. These five unusual features are regarded as apomorphies of. Potamonautes. Eienskappe van die sperms van Potamonautes wat algemeen is vir heterotreme en sy ...

  8. CRUSTACEA: DECAPODA: THALASSINIDEA

    African Journals Online (AJOL)

    Devine (1966) made a similar study of C.filholi in New Zealand. C. kraussi is the dominant macro benthic species in many South Mrican closed estuaries. (Scott et al. 1952; MilJard & Scott 1953; Forbes 1973a) and is also abundant in sheltered sandy areas at many estuary mouths (Day et al. 1952; Day 1958; Macnae 1957).

  9. Thalassinidea, Decapoda, Crustacea

    African Journals Online (AJOL)

    1986-07-23

    Jul 23, 1986 ... starvation, sex, body size, salinity, temperature, seasons and reduced oxygen tensions on the respiratory rates of the prawns were ... No attempt was made to feed the prawns. An open flow respirometer was used to determine oxygen consumption (Figure 1). It was placed in an air-. Figure I The apparatus ...

  10. Single and combined effects of cadmium and arsenate in Gammarus pulex (Crustacea, Amphipoda): Understanding the links between physiological and behavioural responses

    Energy Technology Data Exchange (ETDEWEB)

    Vellinger, Céline, E-mail: celine.vellinger@gmail.com [Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), CNRS UMR 7360, Université de Lorraine – Metz (France); Gismondi, Eric, E-mail: gismondi.eric@gmail.com [Laboratoire d’Ecologie animale et d’Ecotoxicologie, Institut de Chimie, Université de Liège, Allée du 6 Août 15, B-4000 Sart-Tilman, Liège (Belgium); Felten, Vincent, E-mail: vincent.felten@univ-lorraine.fr [Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), CNRS UMR 7360, Université de Lorraine – Metz (France); Rousselle, Philippe, E-mail: rousselle@univ-lorraine.fr [Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), CNRS UMR 7360, Université de Lorraine – Metz (France); Mehennaoui, Kahina, E-mail: meh_kahina@yahoo.fr [Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), CNRS UMR 7360, Université de Lorraine – Metz (France); Parant, Marc, E-mail: parant@univ-lorraine.fr [Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), CNRS UMR 7360, Université de Lorraine – Metz (France); Usseglio-Polatera, Philippe, E-mail: usseglio-polatera@univ-lorraine.fr [Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), CNRS UMR 7360, Université de Lorraine – Metz (France)

    2013-09-15

    Highlights: •Linking physiological to behavioural responses of G. pulex exposed to AsV and/or Cd. •AsV and/or Cd exposure exhibited similar biomarkers responses. •Contamination increases the mobilization of detoxification systems in gammarids. •Both changes in energy reserve use and allocation are involved in gammarid response. •Increased lipid peroxidation could be the cause of increasing gammarid mortality. -- Abstract: This study aimed at investigating the individual and interactive effects of cadmium (Cd) and arsenate (AsV) in Gammarus pulex (Crustacea, Amphipoda) through the use of several biomarkers. Individuals were exposed for 240 h to two concentrations of AsV or Cd alone, and all the possible binary mixtures of these concentrations of AsV and Cd in a complete factorial design. The pattern of the biomarkers’ responses to Cd and AsV alone or in mixture was similar in Gammarus pulex, even if the response intensity varied depending on the tested conditions. G. pulex responded to contamination with increased mobilization of the detoxification systems [i.e. γ-glutamyl-cystein ligase activity (GCL), reduced glutathione content (GSH) and metallothionein concentrations (MT)]. This response seems to imply changes in energy reserve utilization (total lipids and proteins are used prior to glycogen reserves), but also a possible energy reallocation from locomotion to detoxification processes. The observed increase in lipid peroxidation could be relied to the increasing gammarid mortality, despite the higher mobilization of detoxification systems. Even if the outcome of the complex interactions between AsV and Cd remains difficult to unravel, such studies are critically important for better assessing the effects of stressors on organisms, populations and communities in a multi-contamination context of ecosystems.

  11. Parallel reduction in expression, but no loss of functional constraint, in two opsin paralogs within cave populations of Gammarus minus (Crustacea: Amphipoda)

    Science.gov (United States)

    2013-01-01

    Background Gammarus minus, a freshwater amphipod living in the cave and surface streams in the eastern USA, is a premier candidate for studying the evolution of troglomorphic traits such as pigmentation loss, elongated appendages, and reduced eyes. In G. minus, multiple pairs of genetically related, physically proximate cave and surface populations exist which exhibit a high degree of intraspecific morphological divergence. The morphology, ecology, and genetic structure of these sister populations are well characterized, yet the genetic basis of their morphological divergence remains unknown. Results We used degenerate PCR primers designed to amplify opsin genes within the subphylum Crustacea and discovered two distinct opsin paralogs (average inter-paralog protein divergence ≈ 20%) in the genome of three independently derived pairs of G. minus cave and surface populations. Both opsin paralogs were found to be related to other crustacean middle wavelength sensitive opsins. Low levels of nucleotide sequence variation (< 1% within populations) were detected in both opsin genes, regardless of habitat, and dN/dS ratios did not indicate a relaxation of functional constraint in the cave populations with reduced or absent eyes. Maximum likelihood analyses using codon-based models also did not detect a relaxation of functional constraint in the cave lineages. We quantified expression level of both opsin genes and found that the expression of both paralogs was significantly reduced in all three cave populations relative to their sister surface populations. Conclusions The concordantly lowered expression level of both opsin genes in cave populations of G. minus compared to sister surface populations, combined with evidence for persistent purifying selection in the cave populations, is consistent with an unspecified pleiotropic function of opsin proteins. Our results indicate that phototransduction proteins such as opsins may have retained their function in cave

  12. A passive apparatus for controlled-flux delivery of biocides: hydrogen peroxide as an example

    DEFF Research Database (Denmark)

    Olsen, Stefan Møller; Pedersen, L.T.; Dam-Johansen, Kim

    2010-01-01

    A new test method has been developed to estimate the required release rate of hydrogen peroxide (H2O2) to prevent marine biofouling. The technique exploits a well-defined concentration gradient of biocide across a cellulose acetate membrane. A controlled flux of H2O2, an environmentally friendly...... biocide, was obtained. Larvae of the barnacle, Balanus improvisus, were subjected to known release rates of H2O2 from a surface, under laboratory conditions. It was found that the distribution of settled larvae was not significantly different from the controls when H2O2 fluxes of 5-8 mu g cm(-2) day(-1......) were applied. However, release rates of 40 mu g cm(-2) day(-1) significantly displaced the distribution of settled larvae towards the area of the chamber farthest away from the membrane. Membrane tests in seawater (Jyllinge Harbour, Denmark) for over 16 weeks showed that release rates of H2O2...

  13. Importance of plasticity and local adaptation for coping with changing salinity in coastal areas: a test case with barnacles in the Baltic Sea.

    Science.gov (United States)

    Wrange, Anna-Lisa; André, Carl; Lundh, Torbjörn; Lind, Ulrika; Blomberg, Anders; Jonsson, Per J; Havenhand, Jon N

    2014-07-19

    Salinity plays an important role in shaping coastal marine communities. Near-future climate predictions indicate that salinity will decrease in many shallow coastal areas due to increased precipitation; however, few studies have addressed this issue. The ability of ecosystems to cope with future changes will depend on species' capacities to acclimatise or adapt to new environmental conditions. Here, we investigated the effects of a strong salinity gradient (the Baltic Sea system--Baltic, Kattegat, Skagerrak) on plasticity and adaptations in the euryhaline barnacle Balanus improvisus. We used a common-garden approach, where multiple batches of newly settled barnacles from each of three different geographical areas along the Skagerrak-Baltic salinity gradient were exposed to corresponding native salinities (6, 15 and 30 PSU), and phenotypic traits including mortality, growth, shell strength, condition index and reproductive maturity were recorded. We found that B. improvisus was highly euryhaline, but had highest growth and reproductive maturity at intermediate salinities. We also found that low salinity had negative effects on other fitness-related traits including initial growth and shell strength, although mortality was also lowest in low salinity. Overall, differences between populations in most measured traits were weak, indicating little local adaptation to salinity. Nonetheless, we observed some population-specific responses--notably that populations from high salinity grew stronger shells in their native salinity compared to the other populations, possibly indicating adaptation to differences in local predation pressure. Our study shows that B. improvisus is an example of a true brackish-water species, and that plastic responses are more likely than evolutionary tracking in coping with future changes in coastal salinity.

  14. Long-term exposure to acidification disrupts reproduction in a marine invertebrate.

    Directory of Open Access Journals (Sweden)

    Christian Pansch

    Full Text Available Climate change research is advancing to more complex and more comprehensive studies that include long-term experiments, multiple life-history stages, multi-population, and multi-trait approaches. We used a population of the barnacle Balanus improvisus known to be sensitive to short-term acidification to determine its potential for long-term acclimation to acidification. We reared laboratory-bred individuals (as singles or pairs, and field-collected assemblages of barnacles, at pH 8.1 and 7.5 (≈ 400 and 1600 μatm pCO2 respectively for up to 16 months. Acidification caused strong mortality and reduced growth rates. Acidification suppressed respiration rates and induced a higher feeding activity of barnacles after 6 months, but this suppression of respiration rate was absent after 15 months. Laboratory-bred barnacles developed mature gonads only when they were held in pairs, but nonetheless failed to produce fertilized embryos. Field-collected barnacles reared in the laboratory for 8 months at the same pH's developed mature gonads, but only those in pH 8.1 produced viable embryos and larvae. Because survivors of long-term acidification were not capable of reproducing, this demonstrates that B. improvisus can only partially acclimate to long-term acidification. This represents a clear and significant bottleneck in the ontogeny of this barnacle population that may limit its potential to persist in a future ocean.

  15. Antifouling activity of bromotyrosine-derived sponge metabolites and synthetic analogues.

    Science.gov (United States)

    Ortlepp, Sofia; Sjögren, Martin; Dahlström, Mia; Weber, Horst; Ebel, Rainer; Edrada, RuAngelie; Thoms, Carsten; Schupp, Peter; Bohlin, Lars; Proksch, Peter

    2007-01-01

    Eighteen brominated sponge-derived metabolites and synthetic analogues were analyzed for antilarval settlement of Balanus improvisus. Only compounds exhibiting oxime substituents including bastadin-3 (4), -4 (1), -9 (2), and -16 (3), hemibastadin-1 (6), aplysamine-2 (5), and psammaplin A (10) turned out to inhibit larval settling at 1 to 10 microM. Analogues of hemibastadin-1 (6) were synthesized and tested for structure activity studies. Debromohemibastadin-1 (8) inhibited settling of B. improvisus, albeit at lower concentrations than hemibastadin-1 (6). Both 6 and 8 also induced cyprid mortality. 5,5'-dibromohemibastadin-1 (7) proved to be nontoxic, but settlement inhibition was observed at 10 microM. Tyrosinyltyramine (9), lacking the oxime function, was not antifouling active and was non-toxic at 100 microM. Hemibastadin-1 (6) and the synthetic products showed no general toxicity when tested against brine shrimp larvae. In contrast to the lipophilic psammaplin A (10), the hydrophilic sulfated psammaplin A derivative (11) showed no antifouling activity even though it contains an oxime group. We therefore hypothesize that the compound needs to cross membranes (probably by diffusion) and that the target for psammaplin A lies intracellularly.

  16. Caracterización de isopodos terrestres (Crustacea: Isopoda y su impacto en cultivos hortícolas de Boyacá

    Directory of Open Access Journals (Sweden)

    John Wilson Martínez

    2014-06-01

    Full Text Available Las “cochinillas de humedad” (Crustacea: isopoda, han ido surgiendo como organismos plaga de importancia en agricultura, en países como Brasil y Argentina, en donde causan daños en soya, girasol y pastos. Recientemente se han detectado en Boyacá, afectando cebolla de bulbo, frijol y frutales. Por lo anterior, fué necesario iniciar la caracterización de las especies presentes y la determinación de su impacto en la producción hortícola en algunos municipios de esta región. Se realizó muestreos en Paipa, Tibasosa, Nobsa y Santa Rosa de Viterbo, para determinar la presencia y diversidad de especies de “cochinilla de humedad”; así como, una encuesta para establecer la percepción que tenían los agricultores del daño de estos crustáceos y las estrategias de manejo empleadas. Se evaluaron 8 veredas en Paipa, 7 en Nobsa, 3 en Tibasosa y 1 en Santa Rosa de Viterbo. Se comprobó la presencia de “cochinillas de humedad” en cultivos de frutales, hortalizas y otros, en los municipios muestreados. Se identificaron las especies: Porcellios caber, Porcellio dilatatus, Porcellio pruinosus, Armadillidium vulgare y Armadillidium nasatum. El daño por estos organismos se evidenció en lechuga, brócoli, repollo, remolacha, espinaca, cebolla, cilantro, durazno, frijol, fresa, maíz y papa, especialmente en semillero. El daño observado fué mordedura en hojas (50%, raíz (32,35%, tallo (20,85% y ramas (2,94%. Se percibió falta de conocimiento de los agricultores en el manejo de las “cochinillas de humedad”, utilizándose insecticidas en un 79,41% de los casos, un manejo orgánico en 2,99% y ningún manejo en el 5,88%.

  17. ¿Controla la biomasa de pastos marinos la densidad de los peracáridos (Crustacea: Peracarida en lagunas tropicales?

    Directory of Open Access Journals (Sweden)

    Ignacio Winfield

    2007-03-01

    Full Text Available Se analizó la variación en tiempo y espacio de los crustáceos peracáridos que habitan las praderas de Ruppia maritima del sistema lagunar de Alvarado, Veracruz, Golfo de México. El muestreo de esta asociación de crustáceos se realizó de diciembre de 1992 a noviembre de 1994. Los organismos se obtuvieron de 108 muestras recolectadas en seis sitios con R. maritima. La asociación de crustáceos incluyó 11 especies. Ocho especies en Amphipoda (Hourstonius laguna, Cerapus benthophilus, Apocorophium louisianum, Grandidierella bonnieroides, Leptocheirus rhizophorae, Gammarus mucronatus, Melita longisetosa y Haustorius sp., una en Isopoda (Cassidinidea ovalis y dos en Tanaidacea (Discapseudes holthuisi and Leptochelia savignyi. La taxocenosis, la densidad y la biomasa de estos organismos mostraron pulsos estacionales relacionados positivamente con la variación de la biomasa de R. maritima, la salinidad, los afluentes epicontinentales y las bocas de comunicación. Las especies C. ovalis, G. mucronatus, A. louisianum y D. holthuisi fueron componentes dominantes en la asociación de peracáridos.Does sea-grass biomass control the density of peracarids (Crustacea: Peracarida in tropical lagoons? We analyzed the time-space variation of the peracarid crustaceans that inhabit seagrasses of the Alvarado Lagoon System, Veracruz, Gulf of Mexico. The organisms were collected from 108 samples in six sites with Ruppia maritima beds (December 1992 to November 1994. The assemblage was composed of 11 species. Eight species of Amphipoda (Hourstonius laguna, Cerapus benthophilus, Apocorophium louisianum, Grandidierella bonnieroides, Leptocheirus rhizophorae, Gammarus mucronatus, Melita longisetosa and Haustorius sp., one of Isopoda (Cassidinidea ovalis and two of Tanaidacea (Discapseudes holthuisi and Leptochelia savignyi were identified. Taxocoenosis, density and biomass of peracarids showed seasonal pulses related to R. maritima biomass, salinity variation

  18. Lindersin B from Lindernia crustacea induces neuritogenesis by activation of tyrosine kinase A/phosphatidylinositol 3 kinase/extracellular signal-regulated kinase signaling pathway.

    Science.gov (United States)

    Cheng, Lihong; Ye, Ying; Xiang, Lan; Osada, Hiroyuki; Qi, Jianhua

    2017-01-15

    Neurotrophic factors such as nerve growth factor (NGF) play important roles in nervous system. NGF is a potential therapeutic drug for treatment of neurodegenerative diseases. However, because of physicochemical property, NGF cannot pass through the blood-brain barrier (BBB). Hence, small molecules which exhibit NGF-mimic activity and can pass through the BBB are considered to be promising drug candidates for treatment of such diseases. The present study was designed to isolate NGF-mimic substance from extract of natural products, determine their structures and investigate mechanism of action of the active substance. Extract of Lindernia crustacean was partitioned between water and ethyl acetate to obtain water layer and ethyl acetate layer samples, respectively, and then evaluated their neuritogenic activity in PC12 cells. The active sample was separated by open columns, followed by HPLC purification to obtain active compound. Then, specific inhibitors were used to investigate signaling pathway of neurite outgrowth induced by the active compound. Finally, western blot analysis was performed to confirm the pathway proposed by inhibitor experiments. The ethyl acetate layer sample of extract of Lindernia crustacea exhibited significant neuritogenic activity. Two new compounds, named as linderside A and lindersin B, were isolated; their structures were elucidated by spectroscopic and chemical derivatization methods. Linderside A is a cucurbitane glycoside, whereas lindersin B is a cucurbitane triterpenoid. Each compound has an unusual isopentene unit, namely, a double bond bound to an unmodified isopropyl group at the end of cucurbitane triterpenoid side chain. Among them, lindersin B induced significant neurite outgrowth in PC12 cells, while linderside A was inactive against PC12 cells. Western blotting analysis results showed that lindersin B-induced neuritogenic activity depended on the activation of the mitogen-activated protein kinase (MAPK)/extracellular signal

  19. Relação energia: proteína dietária para pós-larvas de Macrobrachium amazonicum (Crustacea, Decapoda - DOI: 10.4025/actascianimsci.v25i2.1979 Dietary energy: protein ratio for Macrobrachium amazonicum (Crustacea, Decapoda- DOI: 10.4025/actascianimsci.v25i2.1979

    Directory of Open Access Journals (Sweden)

    Dario Rocha Falcon

    2003-04-01

    Full Text Available Esta pesquisa foi realizada no Laboratório de Nutrição de Organismos Aquáticos (AquaNutri da FMVZ - Unesp - Campus de Botucatu, unidade integrada ao CaUnesp. Teve por objetivo avaliar o desempenho de pós-larvas de Macrobrachium amazonicum (Crustacea, Decapoda, submetidas a dietas purificadas, contendo 3 níveis de proteína bruta (30%; 35% e 40% e 2 níveis de energia bruta (3200 e 3600kcal/kg de ração, em um delineamento inteiramente casualizado, sistema fatorial 3x2, com 5 repetições. Pós-larvas com peso médio inicial de 280±12mg, provenientes do Setor de Carcinicultura do CaUnesp, foram mantidas em 30 aquários de 80 litros, em um sistema de recirculação de água (1,0L/min com temperatura controlada. Os resultados demonstraram, após 60 dias, a importância do balanço e a interação da energia e da proteína para as pós-larvas. Pode-se concluir que as rações com 35,0% de proteína bruta e 3600kcal de EB/kg proporcionam melhores respostas de ganho de peso e conversão alimentar para o M. amazonicum; que rações com 30,0% de proteína bruta e 3600kcal de EB/kg proporcionam melhores taxas de sobrevivência; e que as melhores respostas de crescimento são obtidas quando as rações apresentam a relação energia:proteína de 10,28:1,0.This experiment was conducted at the Aquatic Nutrition Organisms Laboratory (AquaNutri, integrated unit to CaUnesp. The aim of this study was to evaluate the growth performance of Macrobrachium amazonicum (Crustacea, Decapoda, post larvae. Post larvae were fed diet containing different levels of protein and energy. A factorial experiment with three levels of protein (30.0; 35.0 and 40.0 crude protein and two levels of energy (3200 and 3600 gross energy kcal/kg was carried out on a completely randomly design, with five replicates. 360 post larvae were randomly stocked, average weight of 280±12mg, into 30 aquaria, 80L each aquarium. Albumin-gelatin diet was used. Weight gain, feed conversion and

  20. Eficácia do diflubenzuron no controle de Dolops carvalhoi (Crustacea: Branchiura em jovens pacus Piaractus mesopotamicus (Osteichthyes: Characidae naturalmente infectados - DOI: 10.4025/actascianimsci.v27i2.1235 Diflubenzuron effectiveness in Dolops carvalhoi (Crustacea: Branchiura control in juvenile pacus Piaractus mesopotamicus (Osteichthyes: Characidae naturally infected - DOI: 10.4025/actascianimsci.v27i2.1235

    Directory of Open Access Journals (Sweden)

    Julieta Rodini Engrácia de Moraes

    2005-03-01

    Full Text Available Neste ensaio, avaliou-se a eficácia terapêutica do diflubenzuron contra o crustáceo Dolops carvalhoi (Crustacea: Branchiura em pacus Piaractus mesopotamicus Holmberg 1887 (Osteichthyes: Characidae naturalmente infestados. A droga foi aplicada três vezes na concentração de 2,0 mg/L de água, na forma de banhos com trinta minutos de duração e intervalo de 24 horas. Um grupo controle foi submetido ao mesmo procedimento, sem a adição do fármaco à água. A avaliação parasitológica revelou que a eficácia da droga foi de 97,2%. No grupo tratado houve redução da glicemia, aumento da quantidade de eritrócitos, redução do percentual de células granulocíticas especiais e aumento da quantidade de trombócitos circulantes coincidentes com a eliminação dos parasitos, quando comparado ao grupo controle. Os resultados indicam que ocorreu melhora marcante na saúde dos peixesThis research evaluated the therapeutic efficacy of diflubenzuron against Dolops carvalhoi (Crustacean: Branchiura in Piaractus mesopotamicus (Osteichthyes: Characidae naturally infested. The drug was applied three times, at a dose of 2.0 mg/L of water, in the form of baths within thirty minutes and an interval of 24 hours. A control group was submitted to the same procedure, but without pharmaco in the water. The parasitological evaluation showed that the drug effectiveness was 97.2%. In the treated group there were glycemia reduction, increase in the erythrocyte number, decrease in the percentage of special granulocytic cells and increase in the number of circulant trombocytes similar to the parasites elimination when compared to the control group. Results showed an important improvement in fish health

  1. In vivo and in situ synchrotron radiation-based μ-XRF reveals elemental distributions during the early attachment phase of barnacle larvae and juvenile barnacles.

    Science.gov (United States)

    Senkbeil, Tobias; Mohamed, Tawheed; Simon, Rolf; Batchelor, David; Di Fino, Alessio; Aldred, Nick; Clare, Anthony S; Rosenhahn, Axel

    2016-02-01

    Barnacles are able to establish stable surface contacts and adhere underwater. While the composition of adult barnacle cement has been intensively studied, far less is known about the composition of the cement of the settlement-stage cypris larva. The main challenge in studying the adhesives used by these larvae is the small quantity of material available for analysis, being on the order of nanograms. In this work, we applied, for the first time, synchrotron radiation-based μ-X-ray fluorescence analysis (SR-μ-XRF) for in vivo and in situ analysis of young barnacles and barnacle cyprids. To obtain biologically relevant information relating to the body tissues, adhesives, and shell of the organisms, an in situ sample environment was developed to allow direct microprobe investigation of hydrated specimens without pretreatment of the samples. In 8-day-old juvenile barnacles (Balanus improvisus), the junctions between the six plates forming the shell wall showed elevated concentrations of calcium, potassium, bromine, strontium, and manganese. Confocal measurements allowed elemental characterization of the adhesive interface of recently attached cyprids (Balanus amphitrite), and substantiated the accumulation of bromine both at the point of initial attachment as well as within the cyprid carapace. In situ measurements of the cyprid cement established the presence of bromine, chlorine, iodine, sulfur, copper, iron, zinc, selenium, and nickel for both species. The previously unrecognized presence of bromine, iron, and selenium in the cyprid permanent adhesive will hopefully inspire further biochemical investigations of the function of these substances.

  2. AMPHIPODA (CRUSTACEA OF KHARKOV REGION

    Directory of Open Access Journals (Sweden)

    Sidorovsky S.A.

    2014-08-01

    Full Text Available This research was focused on distribution of Amphipoda in Kharkiv region. The list of Amphipoda species of Kharkiv region was composed. It includes species that belong to 5 genera of 2 families: Synurella ambulans (F. Muller, 1846, Gammarus pulex (Linnaeus, 1758, Gammarus lacustris (Sars, 1863, Pontogammarus robustroides (Sars, 1895 Pontogammarus obesus (Sars, 1896 , Gmelina pusilla (Sars, 1896 and Corophium curvispinum (Sars, 1895. G. pusilla was registered in Kharkiv Region for the first time. The identification key for Amphipoda of Kharkov region was performed.

  3. AMPHIPODA (CRUSTACEA OF KHARKOV REGION

    Directory of Open Access Journals (Sweden)

    S. A. Sidorovsky

    2014-08-01

    Full Text Available This research was focused on distribution of Amphipoda in Kharkiv region. The list of Amphipoda species of Kharkiv region was composed. It includes species that belong to 5 genera of 2 families: Synurella ambulans (F. Muller, 1846, Gammarus pulex (Linnaeus, 1758, Gammarus lacustris (Sars, 1863, Pontogammarus robustroides (Sars, 1895 Pontogammarus obesus (Sars, 1896 , Gmelina pusilla (Sars, 1896 and Corophium curvispinum (Sars, 1895. G. pusilla was registered in Kharkiv Region for the first time. The identification key for Amphipoda of Kharkov region was performed. Keywords: Amphipoda, species composition, Kharkiv region.

  4. Balanus glandula : from North-West America to the west coast of ...

    African Journals Online (AJOL)

    In addition, an attempt is made to trace the origin of the South African population by comparing the distribution of haplotype groups of two molecular markers, ... The frequency of EF1-α haplotype groups from Cape Town was most similar to that of Cape Blanco, Cape Meares and Westport Jetty, and, with lower p-values, ...

  5. Influence of temperature and salinity on larval development of Balanus amphitrite: Implications in fouling ecology

    Digital Repository Service at National Institute of Oceanography (India)

    Anil, A.C.; Chiba, K.; Okamoto, K.; Kurokura, H.

    stream_size 8 stream_content_type text/plain stream_name Mar_Ecol_Prog_Ser_118_159.pdf.txt stream_source_info Mar_Ecol_Prog_Ser_118_159.pdf.txt Content-Encoding ISO-8859-1 Content-Type text/plain; charset=ISO-8859-1 ...

  6. Settlement and recruitment of the barnacle Balanus amphitrite from a tropical environment influenced by monsoons

    Digital Repository Service at National Institute of Oceanography (India)

    Gaonkar, C.A; Anil, A

    Studies on the settlement and the subsequent recruitment of intertidal organisms are crucial steps in understanding their population structure in a particular bioregion. However, studying the recruitment of intertidal organisms such as barnacles...

  7. The effects of a serine protease, Alcalase, on the adhesives of barnacle cyprids (Balanus amphitrite).

    Science.gov (United States)

    Aldred, Nick; Phang, In Yee; Conlan, Sheelagh L; Clare, Anthony S; Vancso, G Julius

    2008-01-01

    Barnacles are a persistent fouling problem in the marine environment, although their effects (eg reduced fuel efficiency, increased corrosion) can be reduced through the application of antifouling or fouling-release coatings to marine structures. However, the developments of fouling-resistant coatings that are cost-effective and that are not deleterious to the marine environment are continually being sought. The incorporation of proteolytic enzymes into coatings has been suggested as one potential option. In this study, the efficacy of a commercially available serine endopeptidase, Alcalase as an antifoulant is assessed and its mode of action on barnacle cypris larvae investigated. In situ atomic force microscopy (AFM) of barnacle cyprid adhesives during exposure to Alcalase supported the hypothesis that Alcalase reduces the effectiveness of the cyprid adhesives, rather than deterring the organisms from settling. Quantitative behavioural tracking of cyprids, using Ethovision 3.1, further supported this observation. Alcalase removed cyprid 'footprint' deposits from glass surfaces within 26 min, but cyprid permanent cement became resistant to attack by Alcalase within 15 h of expression, acquiring a crystalline appearance in its cured state. It is concluded that Alcalase has antifouling potential on the basis of its effects on cyprid footprints, un-cured permanent cement and its non-toxic mode of action, providing that it can be successfully incorporated into a coating.

  8. The effects of a serine protease, Alcalase ®, on the adhesives of barnacle cyprids (Balanus amphitrite),

    NARCIS (Netherlands)

    Aldred, Nick; Phang, In Yee; Conlan, Sheelagh L.; Clare, Anthony S.; Vancso, Gyula J.

    2008-01-01

    Barnacles are a persistent fouling problem in the marine environment, although their effects (eg reduced fuel efficiency, increased corrosion) can be reduced through the application of antifouling or fouling-release coatings to marine structures. However, the developments of fouling-resistant

  9. Influence of temperature on the starvation threshold of nauplii of barnacle Balanus amphitrite (Cirripedia: Thoracica)

    Digital Repository Service at National Institute of Oceanography (India)

    Desai, D.V.; Anil, A.C.

    for his support and encouragement, Dr. A. B. Wagh for his interest in initiating this investigation. We are thankful to Dr. N. B. Bhosle, Head, MCMRD as well as other colleagues. We acknowledge the assistance extended by Mr. S Naik, Mr. N Prabhu and Mr. P...

  10. Physiological responses to hypoxia and anoxia in Balanus amphitrite (Cirripedia: Thoracica)

    Digital Repository Service at National Institute of Oceanography (India)

    Desai, D.V.; Prakash, S.

    of autoxidation min -1 . Enzyme standards were prepared with the increasing concentration and presented in units ml -1 . RESULTS Effects of hypoxia and anoxia on B. amphitrite larvae under starvation Instar II nauplii were subjected to starvation... they were exposed to different DO concentrations. Oxygen consumption of 1.35x10 -3 ml l -1 h -1 mg -1 wet weight was observed in normal DO condition and 2.25x10 -4 and 6.35x10 -5 ml l -1 h -1 mg -1 wet weight was observed at 0.5 and 1 ml l -1...

  11. Quantification of the energy required for the destruction of Balanus Amphitrite larva by ultrasonic treatment

    Digital Repository Service at National Institute of Oceanography (India)

    Seth, N.; Chakravarty, P.; Khandeparker, L.; Anil, A.C.; Pandit, A.B.

    of the acoustic power density. The present investigation suggests that an ultrasonic system operating at 20 kHz and 0.0975 W/cm sup(3) can effectively pulverize barnacle larvae having length (approx. 440 mu m) and breadth (approx. 350 mu m) within 45 seconds using...

  12. Influence of diatom exopolymers and biofilms on metamorphosis in the barnacle Balanus amphitrite

    Digital Repository Service at National Institute of Oceanography (India)

    Patil, J.S.; Anil, A.C.

    1993). In these studies, the inductive effect of biofilms on larval settle- ment is attributed to bacteria and their components in biofilms. In addition, many invertebrates show a gre- garious response towards adult and juvenile con- specifics (e... bacterial cells. Thereafter, the diatom cells were incu- bated overnight in nutrient-enriched media (f/2) con- taining 1 mg ml –1 lysozyme to remove Gram-negative bacteria (Kim et al. 1999). The cultures were again re- peatedly sterilely washed...

  13. Larval development, sensory mechanisms and physiological adaptions in acorn barnacles with special reference to Balanus amphitrite

    Digital Repository Service at National Institute of Oceanography (India)

    Anil, A.C.; Khandeparker, L.; Desai, D.V.; Baragi, L.V.; Gaonkar, C.

    obligate internal cross-fertilization is the norm. However, incidences of self-fertilization have also been reported (Barnes and Crisp, 1956; Furman and Yule, 1990; El-Komi and Kajihara, 1991; Desai et al., 2006). Experiments with B. amphitrite indicated... that egg production was high with brood intervals of 5- 8 days per brood compared to boreo-arctic species which usually produce a single brood per year (Crisp and Davies, 1955; El-Komi and Kajihara, 1991). Temperature and nutritional conditions also...

  14. Reproduction in Balanus amphitrite Darwin (Cirripedia: Thoracica); influence of temperature and food concentration

    Digital Repository Service at National Institute of Oceanography (India)

    Desai, D.V.; Anil, A.C.; Venkat, K.

    on the reproductive biology of this species collected from a tropical habitat was evaluated. Adult barnacles were maintained at 20, 25 and 30°C temperatures at different concentrations of food (50, 100, 150 and 200 Artemia ind-1 day-1). In this previously believed...

  15. Relevance of biofilm bacteria in modulating the larval metamorphosis of Balanus amphitrite

    Digital Repository Service at National Institute of Oceanography (India)

    Khandeparker, L.; Anil, A.C.; Raghukumar, S.

    that the water borne and the surface associated cues from the bacteria function differentially in mediating larval metamorphosis. Understanding the complexities involved in such interactions and identification of the factors governing them would be a step ahead....

  16. Exploration and metamorphosis in Balanus amphitrite Darwin (Cirripedia ; Thoracica) cyprids: significance of sugars and adult extract

    Digital Repository Service at National Institute of Oceanography (India)

    Khandeparker, L.; Anil, A; Raghukumar, S.

    metamorphosis than the non-treated cyprids at 10-8M, whereas cyprids treated with the other LCA specific sugar (D-glucose) showed an inhibitory effect in the absence of AE. This result implies the involvement of D-mannose moieties of AE in the settlement...

  17. Studies on some cues regulating metamorphosis of the larvae of Balanus amphitrite (Cirripedia: Thoracica)

    Digital Repository Service at National Institute of Oceanography (India)

    Khandeparker, L.

    type at different concentrations (Table 2.1). Factor df SS MS Fs A (sugar type) 2 0.83 0.41 B (larval batch) 2 0.08 0.04 C (Conc.) 3 2.8 0.93 A*B 4 0.04 0.01 1.75ns A*C 6 0...-coated surfaces Non-coated surfaces df SS MS Fs SS MS Fs A (Sugar type) 2 5.2 2.6 1.2 0.6 B (Cyprid age) 1 2.2 2.2 4.2 4.2 C (Conc.) 3 0.4 0.13 1 0.3 A*B 2 0.9 0.5 4.85* 0.9 0.4 6.03** A*C 6 2.8 0.5 4.89* 2.7 0.4 6...

  18. The bromotyrosine derivative ianthelline isolated from the arctic marine sponge Stryphnus fortis inhibits marine micro- and macrobiofouling.

    Science.gov (United States)

    Hanssen, Kine O; Cervin, Gunnar; Trepos, Rozenn; Petitbois, Julie; Haug, Tor; Hansen, Espen; Andersen, Jeanette H; Pavia, Henrik; Hellio, Claire; Svenson, Johan

    2014-12-01

    The inhibition of marine biofouling by the bromotyrosine derivative ianthelline, isolated from the Arctic marine sponge Stryphnus fortis, is described. All major stages of the fouling process are investigated. The effect of ianthelline on adhesion and growth of marine bacteria and microalgae is tested to investigate its influence on the initial microfouling process comparing with the known marine antifoulant barettin as a reference. Macrofouling is studied via barnacle (Balanus improvisus) settlement assays and blue mussel (Mytilus edulis) phenoloxidase inhibition. Ianthelline is shown to inhibit both marine micro- and macrofoulers with a pronounced effect on marine bacteria (minimum inhibitory concentration (MIC) values 0.1-10 μg/mL) and barnacle larval settlement (IC50 = 3.0 μg/mL). Moderate effects are recorded on M. edulis (IC50 = 45.2 μg/mL) and microalgae, where growth is more affected than surface adhesion. The effect of ianthelline is also investigated against human pathogenic bacteria. Ianthelline displayed low micromolar MIC values against several bacterial strains, both Gram positive and Gram negative, down to 2.5 μg/mL. In summary, the effect of ianthelline on 20 different representative marine antifouling organisms and seven human pathogenic bacterial strains is presented.

  19. Associational resistance of fouled blue mussels (Mytilus edulis) against starfish (Asterias rubens) predation: relative importance of structural and chemical properties of the epibionts

    Science.gov (United States)

    Laudien, Jürgen; Wahl, Martin

    2004-10-01

    Several epibiotic species reduce starfish (Asterias rubens) preference for the blue mussel Mytilus edulis in the Baltic. The aim of this study was to reveal whether this associational resistance was caused by structural or chemical aspects of the different epibionts. To assess structural epibiont effects, an in situ experiment was conducted with unfouled mussels and mussels equipped with artificial epibionts (`dummies') exposed to natural predation by A. rubens. The chemically inert dummies closely matched the structural properties of the locally common epibionts Balanus improvisus (barnacle), Ceramium strictum (red alga), Halichondria panicea (sponge), and Laomedea flexuosa (hydrozoan). Starfish fed indiscriminately in all treatments. Chemical effects of epibionts on the attractiveness of mussels for A. rubens were investigated by incorporating freeze-dried epibionts or mussel tissue into Phytagel pellets at natural concentrations. Starfish were allowed to choose among these structurally similar but chemically different prey items in an in vitro experiment. The predators exhibited significant preferences among the food pellets, which closely matched their preferences for corresponding natural mussel-epibiont associations. Thus, chemical aspects of epibionts appear to play a larger role in this associational resistance than do structural aspects. Implications of these indirect interactions for benthic communities are discussed.

  20. NA phylogeny of Ryukyus Leucothoidae (Crustacea: Amphipoda)

    NARCIS (Netherlands)

    White, K.N.; Reimer, J.D.

    2012-01-01

    Commensal leucothoid amphipods collected from sponges, ascidians, and coral rubble from the Ryukyu Archipelago, Japan, were investigated using nuclear 18S ribosomal DNA sequences. Analysis of sequences from 21 species in three genera supported the current morphological species designations and the

  1. The Caridean Crustacea of the Canary Islands

    NARCIS (Netherlands)

    Holthuis, L.B.

    1949-01-01

    The present paper is based mainly on material collected at the Canary Islands during the spring of 1947 by Dr. G. Thorson of Universitetets Zoologiske Museum at Copenhagen and Dr. C. O. van Regteren Altena of the Rijksmuseum van Natuurlijke Historie at Leiden. Most of the specimens were collected by

  2. The response of Grandidierella lignorum (Barnard) (Crustacea ...

    African Journals Online (AJOL)

    1988-05-19

    May 19, 1988 ... riviermondinge, tesame met seisoenale effekte, het ook die volopheid van G. lignorum be"invloed. In die. Grootvisgetyrivier, wat 'n standhoudende groot varswatertoevoeging ondervind, was veranderinge in die digtheid van G. lignorum nie met toevloeivariasies gekorreleer nie. Moontlike redes vir hierdie ...

  3. Life history of plesionika edwardsi (crustacea, decapoda ...

    African Journals Online (AJOL)

    African Journal of Marine Science. Journal Home · ABOUT THIS JOURNAL · Advanced Search · Current Issue · Archives · Journal Home > Vol 18 (1997) >. Log in or Register to get access to full text downloads.

  4. The cavernicolous Oniscidea (Crustacea: Isopoda of Portugal

    Directory of Open Access Journals (Sweden)

    Ana Sofia P.S. Reboleira

    2015-12-01

    Full Text Available The study of subterranean Oniscidea in Portugal has been neglected for nearly 70 years, but recent investigations have revealed high diversity. All the terrestrial isopods from caves of mainland Portugal, including data from the literature and new material, are listed, revealing new biodiversity patterns. Twenty-seven species, belonging to 15 genera and six families, are known, of which 16 species are considered to be exclusively from subterranean ecosystems, i.e., troglobionts. Trichoniscidae is the most diverse family. Seven species in the family Trichoniscidae and one species in the family Styloniscidae are described as new (all with Reboleira & Taiti as authors: Trichoniscoides bellesi sp. nov. from the Montejunto Massif; T. sicoensis sp. nov. from the Sicó Massif; Metatrichoniscoides salirensis sp. nov. from the typhonic valley of Caldas da Rainha; Troglonethes olissipoensis sp. nov. from the Lisbon Peninsula; T. arrabidaensis sp. nov. from the Arrábida Massif; Miktoniscus longispina sp. nov. from the Sicó Massif and Cesaredas Plateau; Moserius inexpectatus sp. nov. from the Estremenho Massif; and Cordioniscus lusitanicus sp. nov. from Alentejo and Algarve, the southernmost provinces of Portugal. The subgenus Trogleluma Vandel, 1946 (Armadillidiidae is raised to genus level. In this geographic region terrestrial isopods are the richest group of cave-adapted animals.

  5. Louisiana crayfish ( Procambarus clarkii ) (Crustacea: Cambaridae ...

    African Journals Online (AJOL)

    In an eight-week laboratory mesocosm experiment, crayfish decreased water clarity and reduced populations of slow-moving, benthic invertebrates including non-target snails, chironomid larvae and oligochaetes. Similar declines in invertebrates occurred in an unreplicated 35-day whole-pond experiment. In addition, water ...

  6. The cavernicolous Oniscidea (Crustacea: Isopoda) of Portugal

    DEFF Research Database (Denmark)

    P. S. Reboleira, Ana Sofia; Gonçalves, Fernando J.; Oromí, Pedro

    2015-01-01

    The study of subterranean Oniscidea in Portugal has been neglected for nearly 70 years, but recent investigations have revealed high diversity. All the terrestrial isopods known from caves of mainland Portugal, including data from the literature and new material, are listed, revealing new biodive...

  7. (CaIman) (Crustacea, Decapoda, Branchiura)

    African Journals Online (AJOL)

    1994-01-25

    Jan 25, 1994 ... was also found that more copper accumulated in the ovary than in the testis per unit weight. The bioaccumu- lation factors (BF) ... (Gcorge 1982; Bjerregaard & Vislie 1986) and loss of membrane integrity due to the ...... ences, starvation, age, stage in life history, sex and moulting. (Bryan 1976). The mte at ...

  8. Life history of plesionika edwardsi (crustacea, decapoda ...

    African Journals Online (AJOL)

    length (CL). The species carries out seasonal migrations; they concentrate in deep water during winter, move shallower in summer and return to deep water again in autumn. Ovigerous females occur throughout the year, but a spawning peak was determined between April and September. The size at maturity for females ...

  9. Habitat traits and food availability determine the response of marine invertebrates to ocean acidification.

    Science.gov (United States)

    Pansch, Christian; Schaub, Iris; Havenhand, Jonathan; Wahl, Martin

    2014-03-01

    Energy availability and local adaptation are major components in mediating the effects of ocean acidification (OA) on marine species. In a long-term study, we investigated the effects of food availability and elevated pCO2 (ca. 400, 1000 and 3000 μatm) on growth of newly settled Amphibalanus (Balanus) improvisus to reproduction, and on their offspring. We also compared two different populations, which were presumed to differ in their sensitivity to pCO2 due to differing habitat conditions: Kiel Fjord, Germany (Western Baltic Sea) with naturally strong pCO2 fluctuations, and the Tjärnö Archipelago, Sweden (Skagerrak) with far lower fluctuations. Over 20 weeks, survival, growth, reproduction and shell strength of Kiel barnacles were all unaffected by elevated pCO2 , regardless of food availability. Moulting frequency and shell corrosion increased with increasing pCO2 in adults. Larval development and juvenile growth of the F1 generation were tolerant to increased pCO2 , irrespective of parental treatment. In contrast, elevated pCO2 had a strong negative impact on survival of Tjärnö barnacles. Specimens from this population were able to withstand moderate levels of elevated pCO2 over 5 weeks when food was plentiful but showed reduced growth under food limitation. Severe levels of elevated pCO2 negatively impacted growth of Tjärnö barnacles in both food treatments. We demonstrate a conspicuously higher tolerance to elevated pCO2 in Kiel barnacles than in Tjärnö barnacles. This tolerance was carried over from adults to their offspring. Our findings indicate that populations from fluctuating pCO2 environments are more tolerant to elevated pCO2 than populations from more stable pCO2 habitats. We furthermore provide evidence that energy availability can mediate the ability of barnacles to withstand moderate CO2 stress. Considering the high tolerance of Kiel specimens and the possibility to adapt over many generations, near future OA alone does not seem to

  10. Impact of Irgarol 1051 on the larval development and metamorphosis of Balanus amphitirite Darwin, diatom, Amphora coffeaformis and natural biofilm

    Digital Repository Service at National Institute of Oceanography (India)

    Desai, D.V.

    cells mm -2 respectively. DISCUSSION Irgarol 1051 is a widely used antifouling additive; however, its increased occurrence in the marine environment is of concern. Irgarol 1051 is prevalent in tropical marine ecosystems and is a potent inhibitor... 1051 Material Safety Data Sheet 638/9501. Ciba Geigy Limited, Additives Division, Basle, Switzerland. Cole JJ. 1982. Interactions between bacteria and algae in aquatic ecosystems. Ann Rev Ecol Sys. 13:291-314. CSC. 2001. Summary of Ecological...

  11. Characterisation of the bacteria associated with barnacle, Balanus amphitrite, shell and their role in gregarious settlement of cypris larvae

    Digital Repository Service at National Institute of Oceanography (India)

    BacchettiDeGregoris, T.; Khandeparker, L.; Anil, A.C.; Mesbahi, E.; Burgess, J.G.; Clare, A.S.

    biofilms at low taxonomic levels. Our results indicate that barnacle larvae may be able to detect parentally-associated biofilms and use this information to settle close to members of its own species....

  12. Factors regulating the production of different inducers in Pseudomonas aeruginosa with reference to larval metamorphosis in Balanus amphitrite

    Digital Repository Service at National Institute of Oceanography (India)

    Khandeparker, L.; Anil, A.C.; Raghukumar, S.

    and other environmental stimuli; hence, the behavioral and morphogenetic responses may be trig- gered by different inducers (Rodriguez et al. 1993). Settlement and metamorphosis are shown to be con- trolled by larval sensory recognition, which transduces... the external signals into signals within the organism (Pawlik 1992). Field and laboratory studies have shown that barna- cle cyprids prefer to metamorphose on or near con- specifics. The responsible settlement pheromone or positive cue has been recognized...

  13. Inhibitory effect of Indian sponge extracts on bacterial strains and larval settlement of the barnacle, Balanus Amphitrite

    Digital Repository Service at National Institute of Oceanography (India)

    LimnaMol, V.P.; Raveendran, T.V.; Abhilash, K.R.; Parameswaran, P.S.

    .R., Lee, B.J., Jung, J.H. 2002. Polyacetylenes from a marine sponge Petrosia sp. inhibit DNA replication at the level of initiation. Cancer Letters. 185, 95–101. 12. Limna Mol, V.P., Raveendran, T.V., Parameswaran, P.S. 2009. Antifouling activity...

  14. Recruitment of the barnacle Balanus amphitrite Darwin in a tropical estuary: implications of environmental perturbation, reproduction and larval ecology

    Digital Repository Service at National Institute of Oceanography (India)

    Desai, D.V.; Anil, A.C.

    planktotrophic naupliar stages, followed by a pre- settling, non-feeding cypris larva. The key factor that influences the final destination of the larva during dispersal is the duration of its planktonic phase. Pechenik et al. (1998) also reported... maintained at 12h light: 12h dark cycle. Observations on the molts were taken every day prior to changing the food. The total naupliar duration and percentage survival of nauplii to cyprids was measured. As cyprids appeared they were put...

  15. Comparative Exploration of the Structure-Activity Space of Clonedα-Like Octopamine Receptors from a Marine and a Terrestrial Arthropod.

    Science.gov (United States)

    Dalwadi, Dhwanil A; Schetz, John A

    2017-09-01

    The α -like octopamine receptors (OctR) are believed to be the evolutionary precursor to the vertebrate α 2 -adrenergic receptors ( α 2 -ARs) based upon sequence similarity and the ability to interact with norepinephrine and a number of compounds that bind with high affinity to α 2 -ARs. Barnacles and fruit flies are two prominent model marine and terrestrial representatives of the Arthropoda phylum, and although α -like OctRs have been cloned from Balanus improvisus (BiOctR) and Drosophila melanogaster (DmOctR), little is known about the structure-activity space for these important species. A diverse panel of 22 probes spanning different structural classes were employed to interrogate the structure-activity of the BiOctR and DmOctR. While BiOctR and DmOctR exhibited similar functional profiles for mammalian biogenic amine G protein-coupled receptor agonists and antagonists, some ligands had dramatically different mechanisms of action. For instance, significant differences in the efficacy for some agonists were observed, including that vertebrate biogenic amines structurally related to octopamine acted as superagonists at the DmOctR but partial agonists at the BiOctR, and the two species diverged in their sensitivities to the α 2 -AR antagonist [ 3 H]rauwolscine. Furthermore, sodium enhanced [ 3 H]rauwolscine's interactions with the BiOctR, but not at a vertebrate α 2 -AR. Molecular mechanistic studies indicate that rauwolscine interacts with the BiOctR, DmOctR, and α 2C -adrenergic receptor at an allosteric site. In addition, compounds that acted as agonists at a cloned α -like BiOctR also induced a hyperactivity response in Balanus cyprids mediated by the α -like OctR, suggesting that the receptor may serve as a higher throughput proxy for discovering compounds with potential cyprid deterrent properties. Copyright © 2017 by The American Society for Pharmacology and Experimental Therapeutics.

  16. Br anchiopoda and Copepoda (Crustacea in Mongolian Saline Lakes

    Directory of Open Access Journals (Sweden)

    Miguel Alonso

    2010-06-01

    Full Text Available Thi s paper presents a very complete inventory of the branchiopods and copepods that inhabit the salt lakes (salinity >3‰ of Mongolia. The inventory was based on samples collected from 108 salt lakes over the course of seven limnological expeditions in most of the Mongolian territory between 2005 and 2009. The salinity of the lakes ranged from 3.4 to 76‰ S. A total of 43 taxa were identifi ed: 7 Anostraca, 1 Spinicaudata, 1 Notostraca, 1 Leptodoridae, 1 Ctenopoda, 15 Anomopoda and 17 Copepoda. Thirteen taxa are limited to the Asiatic portion and the rest are known throughout the Palearctic region. One taxon, Phallocryptus sp. has not yet been described in scientifi c literature. The taxonomic position of Artemia sp. in Mongolia has still not been clarifi ed. All of the species are eurysaline and, except for Artemia sp. and Cletocamptus retrogressus , which are the most halophile, they can live in waters with less than 10‰ S. Thirty-three species appear only in mesosaline waters (3–20‰ S, fi ve do not exceed the mesosaline level (50‰ S and fi ve can live in hypersaline waters (>50‰ S.

  17. On some Indo-westpacific Palaemoninae (Crustacea Decapoda Caridae)

    NARCIS (Netherlands)

    Holthuis, L.B.

    1952-01-01

    Since the publication of my paper on the prawns of the subfamily Palaemoninae collected by the Siboga and Snellius Expeditions (Holthuis, 1950, Siboga Exped., mon. 39a9), I had the opportunity to examine more material of this group, which enabled me to make additions and corrections to the above

  18. Epigean freshwater Gammaridae (Crustacea, Amphipoda) from La Gomera (Canary Islands)

    NARCIS (Netherlands)

    Beyer, Gabriele; Stock, Jan H.

    1994-01-01

    Description of two new species of freshwater amphipods from La Gomera (Canary Islands), both found in the higher parts of the island: Chaetogammarus chaetocerus n. sp. and Rhipidogammarus gomeranus n. sp. Both species have distinct Afro- Iberian relationships.

  19. First Zoeal Stage of Camptandrium sexdentatum (Crustacea: Decapoda: Camptandriidae

    Directory of Open Access Journals (Sweden)

    Park, Jay Hee

    2014-10-01

    Full Text Available The first zoea of Camptandrium sexdentatum is described for the first time with a digital image of live zoeas. An ovigerous crab of C. sexdentatum was collected at the muddy sand flat in Namhaedo Island on 2 June 2012 and hatched in the laboratory on 6 June 2012. In Camptandriidae, the first zoea of C. sexdentatum is distinguished from the first zoeas of Cleistostoma dilatatum and Deiratonotus cristatum by having no dorsal and lateral carapace spines, an abdomen significantly broadened posteriorly, and a subovoid telson without forks. Especially, the finding of a subovoid telson without forks is the first report in brachyuran zoeas.

  20. Aspects of the biology of Platorchestia fayetta sp. nov. (Crustacea ...

    African Journals Online (AJOL)

    Amphipods form an important component of coastal fauna and this study is focused on the biology of semi-terres- trial Platorchestia fayetta sp. nov. inhabiting sand and wave-cast algae on the north-eastern coast at Poste La Fayette, Mauritius. The population structure, size class variation, sex ratio and female reproductive ...

  1. Melitidae (Crustacea, Amphipoda) from anchihaline limestone caves in New Caledonia

    NARCIS (Netherlands)

    Stock, Jan H.; Iliffe, Thomas M.

    1995-01-01

    Four new species of Melitidae (Amphipoda) are described from anchihaline limestone caves in New Caledonia. Three species are classified with Josephosella Ruffo, 1985 (J. microps n. sp., J. debilis n. sp., and J. proiecta n. sp.) and a new genus, Caledopisa, is erected for the fourth species, C.

  2. Sex ratio and sexual selection in wormshrimps (Crustacea, Amphipoda, Ingolfiellidea)

    NARCIS (Netherlands)

    Vonk, R.; Nijman, V.

    2006-01-01

    Small populations of several species of the groundwater dwelling amphipod genus Ingolfiella are found in caves, wells, seabottoms, beaches and riverbed interstitial habitats. To gain insight in the socio-ecology of these elusive species, we used data from collected specimens to explore the

  3. Sex ratio and sexual selection in wormshrimps (Crustacea, Amphipoda, Ingolfiellidea)

    OpenAIRE

    Vonk, R.; Nijman, V.

    2006-01-01

    Small populations of several species of the groundwater dwelling amphipod genus Ingolfiella are found in caves, wells, seabottoms, beaches and riverbed interstitial habitats. To gain insight in the socio-ecology of these elusive species, we used data from collected specimens to explore the relationships between sexratios, display of secondary sexual characters and other morphological features, and habitat use. We extracted data on the sex ratios and the presence-absence of secondary sexual ch...

  4. Identifying Chinese species of Gammarus (Crustacea: Amphipoda using DNA barcoding

    Directory of Open Access Journals (Sweden)

    HOU Zhong-E

    2009-04-01

    Full Text Available Using a standard cytochrome c oxidase I sequence, DNA barcoding has been shown to be effective to distinguish known species and to discover cryptic species. Here we assessed the efficiency of DNA barcoding for the amphipod genus Gammarus from China. The maximum intraspecific divergence for widespread species, Gammarus lacustris, was 3.5%, and mean interspecific divergence reached 21.9%. We presented a conservative benchmark for determining provisional species using maximum intraspecific divergence of Gammarus lacustris. Thirty-one species possessed distinct barcode clusters. Two species were comprised of highly divergent clades with strong neighbor-joining bootstrap values, and likely indicated the presence of cryptic species. Although DNA barcoding is effective, future identification of species of Gammarus should incorporate DNA barcoding and morphological detection.

  5. The first hypothelminorheic Crustacea (Amphipoda, Dogielinotidae, Hyalella from South America

    Directory of Open Access Journals (Sweden)

    Stella Rodrigues

    2012-11-01

    Full Text Available Most of known troglobiotic species occur in caves and subterranean environments from great depths. However, recently more attention has been given to other subterranean environments, such as the hypothelminorheic habitats. It comprises the most superficial among all subterranean habitats. This kind of environment is characterized by the constant presence of wet spots, absence of light and very particular abiotic characteristics, comprising unique species. The first hypothelminorheic Amphipoda from South America is here described, a new species of the genus Hyalella which occurs in a wetland on Southern Brazil. The new species differs from other troglobiotics of the genus by the presence of a curved seta on the inner ramus of uropod 1 and elongation of appendices, as the first pair of antennae and peraeopods 6 and 7. However, human impacts in the area where the new species occurs have changed heavily their habitat, which may have led the species to a critical level of threat or even extinction, demonstrating the fragility of this environment.a

  6. On the origin and evolution of Antarctic Peracarida (Crustacea, Malacostraca

    Directory of Open Access Journals (Sweden)

    Angelika Brandt

    1999-12-01

    Full Text Available The early separation of Gondwana and the subsequent isolation of Antarctica caused a long evolutionary history of its fauna. Both, long environmental stability over millions of years and habitat heterogeneity, due to an abundance of sessile suspension feeders on the continental shelf, favoured evolutionary processes of preadapted taxa, like for example the Peracarida. This taxon performs brood protection and this might be one of the most important reasons why it is very successful (i.e. abundant and diverse in most terrestrial and aquatic environments, with some species even occupying deserts. The extinction of many decapod crustaceans in the Cenozoic might have allowed the Peracarida to find and use free ecological niches. Therefore the palaeogeographic, palaeoclimatologic, and palaeo-hydrographic changes since the Palaeocene (at least since about 60 Ma ago and the evolutionary success of some peracarid taxa (e.g. Amphipoda, Isopoda led to the evolution of many endemic species in the Antarctic. Based on a phylogenetic analysis of the Antarctic Tanaidacea, Sieg (1988 demonstrated that the tanaid fauna of the Antarctic is mainly represented by phylogenetically younger taxa, and data from other crustacean taxa led Sieg (1988 to conclude that the recent Antarctic crustacean fauna must be comparatively young. His arguments are scrutinized on the basis of more recent data on the phylogeny and biodiversity of crustacean taxa, namely the Ostracoda, Decapoda, Mysidacea, Cumacea, Amphipoda, and Isopoda. This analysis demonstrates that the origin of the Antarctic fauna probably has different roots: an adaptive radiation of descendants from old Gondwanian ancestors was hypothesized for the isopod families Serolidae and Arcturidae, an evolution and radiation of phylogenetically old taxa in Antarctica could also be shown for the Ostracoda and the amphipod family Iphimediidae. A recolonization via the Scotia Arc appears possible for some species, though it is not very likely (some Isopoda, like the Sphaeromatidea, are widely distributed in the Subantarctic, but rare in the high Antarctic. However, it could also be that the species of this family and others were not able to survive when the ice reached the sublittoral shelf in the high Antarctic during glacial periods.

  7. Distribution and community structure of Ostracoda (Crustacea) in ...

    African Journals Online (AJOL)

    The current study presents the ostracod communities recovered from 26 shallow waterbodies in southern Kenya, combined with an ecological assessment of habitat characteristics. A total of 37 waterbodies were sampled in 2001 and 2003, ranging from small ephemeral pools to large permanent lakes along broad ...

  8. Branchiuran parasites (Crustacea: Branchiura) from fishes in the ...

    African Journals Online (AJOL)

    Fish parasitological surveys, conducted during different times of the year in the Okavango and Upper Zambezi River systems from 1997 to 2013, revealed the presence of five branchiuran species. Dolops ranarum from the Okavango system was found on the skin and in the branchial chambers of 12 fish species. Adults and ...

  9. Additions to the barnacle (Crustacea: Cirripedia) fauna of South Africa

    African Journals Online (AJOL)

    The purpose of this paper is to document recent additions to the South African barnacle (Cirripedia) fauna. New species records were obtained by examining accumulated collections of unidentified material in the Iziko South African Museum, as well as via material collected directly by the authors. Fourteen species, none of ...

  10. CONTRIBUTIONS TO DISTRIBUTION OF TURKISH FRESHWATER ISOPODS (CRUSTACEA: ISOPODA

    Directory of Open Access Journals (Sweden)

    Belgin Çamur-Elipek

    2016-11-01

    Full Text Available This study was carried out to contribute to distribution of freshwater isopods in Marmara Region (including Gökçeada and Bozcaada islands of Turkey. For this aim, it was evaluated the material which was sampled during the years 1991, and 1998-2002 in a total of 37 localities from different water resources in the region. End of the study, it was observed that Asellus aquaticus (L. Racovitza, 1919 is a very common species in the area. Furthermore, subspecies and intersex forms belonging Asellus aquaticus were recorded in some localities.

  11. Asellus (Asellus) monticola en Iran (Crustacea, Isopoda, Asellota, Asellidae)

    NARCIS (Netherlands)

    Henry, Jean-Paul; Magniez, Guy

    1996-01-01

    Asellus (Asellus) monticola monticola Birstein, 1932 has been found in a spring in the extreme NW of Iran. Amplifications of the original description of this valid species, which is clearly distinct from A. aquaticus, are given. Contrary to A. aquaticus, A. monticola appears to be strongly endemic

  12. Deep phylogeny and character evolution in thecostraca (Crustacea: Maxillopoda)

    DEFF Research Database (Denmark)

    Pérez-Losada, Marcos; Høeg, Jens Thorvald; Crandall, Keith A.

    2012-01-01

    published since Darwin's seminal monographs, few studies have tested evolutionary hypotheses about Thecostraca within a phylogenetic context. In this review, we combine a Bayesian phylogenetic method and multilocus sequence data to reconstruct the evolutionary history of 12 key thecostracan phenotypic...

  13. A new caprellid species (Crustacea: Amphipoda: Senticaudata) from Brazil.

    Science.gov (United States)

    Ros, Macarena; Lacerda, Mariana B; Guerra-García, José M

    2017-05-01

    A new species of caprellid, Pseudaeginella arraialensis, is described from Arraial do Cabo, Rio de Janeiro, Brazil. Abundant material was collected in Praia do Forno, associated to hydroids and algae of natural rocky substrata and fouling communities of artificial floating structures. The new species can be distinguished easily from the remaining species in the genus mainly by the pattern of dorsal projections, and by the setose antennae and gnathopod 2 in males. The dietary analysis revealed that the species is omnivorous, with a high contribution of small crustaceans in its diet. Detailed figures showing ontogenetic development and intraspecific variation of P. arraialensis are also included.

  14. Zoological notes from port Dickson : III. Crustacea Anomura and Brachyura

    NARCIS (Netherlands)

    Buitendijk, A.M.

    1947-01-01

    From his stay at Port Dickson on the Malay Peninsula at the beginning of 1946 Major Dr. L. D. Brongersma of the N I C A Detachment brought home several species of crabs. A list of this material which is now incorporated in the collections of the Museum of Natural History at Leiden is given below,

  15. Porcelain crabs from Brazil (Crustacea: Decapoda: Anomura: Porcellanidae).

    Science.gov (United States)

    Ferreira, Luciane Augusto De Azevedo; De Melo, Gustavo Augusto Schmidt

    2016-03-15

    Twenty species of porcelain crabs are reported on the basis of material collected from Brazilian coasts. Considering the lack of systematic studies comprehending the Brazilian porcellanids, the present work presents a review of the regional species based on the current taxonomic information. New records, information about variation between specimens and a taxonomic discussion are given for porcellanid crabs from Brazil.

  16. Three new American species of Munidopsis (Crustacea: Anomura: Munidopsidae

    Directory of Open Access Journals (Sweden)

    Gary C. B. Poore

    Full Text Available Three new species of Munidopsis (M. amapa and M. brasilia from Brazil, and M. bajacalifornia from California and the Galápagos Islands are described. All are small, superficially similar to each other and from shallower depths than is typical of most of the genus. All species have a highly sculptured carapace, triangular rostrum and immovable eyestalks with prominent anterior eyespines.

  17. [Marine biodiversity of Costa Rica: Crustacea: Infraorder Anomura].

    Science.gov (United States)

    Vargas, Rita; Cortés, Jorge

    2006-06-01

    The anomuran crabs are among the best known crustacean groups from the Pacific coast. However, this group is poorly known from the Caribbean coast of Costa Rica. In this compilation based on the literature and the collection at the Zoology Museum, Biology School, University of Costa Rica, we report the presence of 114 species of the Infraorder Anomura for Costa Rica, 20 species from the Caribbean, 96 species from the Pacific (two are present on both coasts). Twenty-nine species are new reports for Costa Rica, 15 from the Caribbean coast (74% of the total of species from that coast) and 14 from the Pacific (15% of the total from the Pacific). The range often species is extended to Costa Rica, siete from the Caribbean and three from the Pacific. Six species are reported for the first time from Cocos Island, where there are also four endemic species.

  18. Galatheoid squat lobsters (Crustacea: Decapoda: Anomura from Korean waters

    Directory of Open Access Journals (Sweden)

    Jung Nyun Kim

    2016-10-01

    Full Text Available Abstract Ten species of Galatheoidea (squat lobsters, belonging to two families, were collected in the Korean exclusive economic zone: Galathea balssi Miyake and Baba, 1964, Galathea orientalis Stimpson, 1858, Galathea pubescens Stimpson, 1858, and Galathea rubromaculata Miyake and Baba, 1967 belonging to Galatheidae; Bathymunida brevirostris Yokoya, 1933, Cervimunida princeps Benedict, 1902, Munida caesura Macpherson and Baba, 1993, Munida japonica Stimpson, 1858, Munida pherusa Macpherson and Baba, 1993, and Paramunida scabra (Henderson, 1885 belonging to Munididae. The present study comprises the morphological description of these ten species, including drawings and color photographs, a brief review of their regional records, and a key for their identification. Although all species are common in Japanese waters, G. balssi, G. rubromaculata, B. brevirostris, C. princeps, M. caesura, and M. pherusa are new to Korean marine fauna.

  19. The decapod and stomatopod Crustacea of St Paul's Rocks

    NARCIS (Netherlands)

    Holthuis, L.B.

    1980-01-01

    INTRODUCTION Saint Paul's Rocks (Penedos de São Pedro e São Paulo) are a small group of rocky islets on the mid-Atlantic ridge near the equator, occupying an area of roughly 250 by 425 m. There is no vegetation and, apart from birds and invertebrates, the islands are uninhabited. The Cambridge

  20. Monstrilloida (Crustacea: Copepoda) from the Beagle Channel, South America

    NARCIS (Netherlands)

    Suárez-Morales, E.; Ramírez, F.C.; Derisio, C.

    2008-01-01

    Monstrilloid copepods were collected during zooplankton surveys in the Beagle Channel at the southernmost end of South America. These specimens represent two species of Monstrillopsis, one of them undescribed, and one new species of Monstrilla. Monstrillopsis igniterra n. sp. is related to forms of

  1. The spelling of the name Sarothrogammarus (Crustacea, Amphipoda)

    NARCIS (Netherlands)

    Stock, Jan H.

    1972-01-01

    In my recent revision of the Sarothrogammarus-group (Bijdr. Dierk., 41: 94—129, 1971), I consistently used the spelling Sarathrogammarus. Professor S. Ruffo, of Verona, kindly pointed out to me that the original spelling of the name is Sarothrogammarus (see Martynov, 1935, Trav. Inst. zool. Acad.

  2. Molecular Phylogeny and Revision of Copepod Orders (Crustacea: Copepoda).

    Science.gov (United States)

    Khodami, Sahar; McArthur, J Vaun; Blanco-Bercial, Leocadio; Martinez Arbizu, Pedro

    2017-08-22

    For the first time, the phylogenetic relationships between representatives of all 10 copepod orders have been investigated using 28S and 18S rRNA, Histone H3 protein and COI mtDNA. The monophyly of Copepoda (including Platycopioida Fosshagen, 1985) is demonstrated for the first time using molecular data. Maxillopoda is rejected, as it is a polyphyletic group. The monophyly of the major subgroups of Copepoda, including Progymnoplea Lang, 1948 (=Platycopioida); Neocopepoda Huys and Boxshall, 1991; Gymnoplea Giesbrecht, 1892 (=Calanoida Sars, 1903); and Podoplea Giesbrecht, 1892, are supported in this study. Seven copepod orders are monophyletic, including Platycopioida, Calanoida, Misophrioida Gurney, 1933; Monstrilloida Sars, 1901; Siphonostomatoida Burmeister, 1834; Gelyelloida Huys, 1988; and Mormonilloida Boxshall, 1979. Misophrioida (=Propodoplea Lang, 1948) is the most basal Podoplean order. The order Cyclopoida Burmeister, 1835, is paraphyletic and now encompasses Poecilostomatoida Thorell, 1859, as a sister to the family Schminkepinellidae Martinez Arbizu, 2006. Within Harpacticoida Sars, 1903, both sections, Polyarthra Lang, 1948, and Oligoarthra Lang, 1948, are monophyletic, but not sister groups. The order Canuelloida is proposed while maintaining the order Harpacticoida s. str. (Oligoarthra). Cyclopoida, Harpacticoida and Cyclopinidae are redefined, while Canuelloida ordo. nov., Smirnovipinidae fam. nov. and Cyclopicinidae fam. nov are proposed as new taxa.

  3. Comparative ultrastructure of the root system in rhizocephalan barnacles (Crustacea

    DEFF Research Database (Denmark)

    Bresciani, J; Høeg, Jens Thorvald

    2001-01-01

    . The rootlets consist of a cuticle, an epidermis and a subjacent layer of axial cells that often, but not always surround, a central lumen. The rootlets are at all times enclosed in a less than 0.5 microm thick cuticle, which is never molted. The cuticle consists of an inner homogeneous layer with a slightly...... by long septate junctions and exhibit the characteristics of a transporting epithelium. Experiments with acid phosphatase revealed activity both in the epidermis and among the microcuticular projections. The projections may therefore form a domain that is important in absorption and extracellular...... the rootlets towards the external reproductive body. In C. delagei the single, bladder-shaped rootlet lacks both the apical projections in the epidermis, the electron-dense cuticle layer, and the microcuticular projections. We review previous studies on the rhizocephalan root system and discuss functional...

  4. Effects of predation by Hydra (Cnidaria on cladocerans (Crustacea: Cladocera

    Directory of Open Access Journals (Sweden)

    Ligia Rivera-De la Parra

    2016-03-01

    Full Text Available Planktonic cladocerans have evolved different strategies to avoid predation from vertebrates; these include changes in morphology, behavior, physiology, and/or life-history traits. However, littoral cladocerans are better adapted to avoid invertebrate predation particularly from insect larvae by evolving morphological and physiological adaptations. Nevertheless, this has not been proven for some littoral predators such as Hydra. In this study, we provide quantitative data on how Hydra affects its zooplankton prey. We studied the predation behavior on Alona glabra, Ceridodaphnia dubia, Daphnia pulex, Daphnia cf. mendotae, Diaphanosoma birgei, Macrothrix triserialis, Moina macrocopa, Pleuroxus aduncus, Scapholeberis kingi, Simocephalus vetulus, Elaphoidella grandidieri, Brachionus rubens and Euchlanis dilatata. We also tested the indirect effect of allelochemicals from Hydra on the demography of Daphnia cf. mendotae. Littoral cladocerans are specially adapted to resist nematocyst injection and discharge of toxic substances from Hydra. A significant decrease in the population growth rate from 0.21 to 0.125 d-1 was observed at densities of 2 ind. ml-1. The role of carapace thickness as an adaptive strategy of littoral cladocerans against Hydra predation is discussed.

  5. A checklist of the marine Calanoida (Crustacea, copepoda) of Nigeria.

    African Journals Online (AJOL)

    This paper is based on analysis of a total of 725 zooplankton samples collected during series of surveys of the marine ecosystem of the continental shelf along the Nigeria Gulf of Guinea, between 1999 and 2010. The list encompasses a total of 55 species of Calanoida in 14 families and 27 genera. At the genus level, the ...

  6. Species of marine Isopoda (Crustacea, Peracarida from southern Brazil

    Directory of Open Access Journals (Sweden)

    Plínio Soares Moreira

    1972-01-01

    Full Text Available Some species of marine Isopoda collected in southern Brazil mostly in shallow-water and amongst seaweeds are studied. Five species are discussed and illustrated. A diagnosis is given for each species. Idotea metallica and Synidotea marplatensis are new oc currences for the area, and both have had their geographical range extended to off Rio de Janeiro. The presence of Idotea balthica and Erichsonella filiformis in southern Brazil was definitely asserted. Illustrations of both sexes of Rocinela signata and details about its occurrence in the region surveyed were made.O presente trabalho relaciona algumas espécies de isopodes marinhos coletados na região centro-sul do Brasil, em águas razas, em algas, ou entre emaranhados de folhas e raizes. Cinco espécies são ilustradas e discutidas. Uma diagnose é dada para cada espécie. I. metallica e S. marplatensis, constituindo novas ocorrências para a região, tiveram sua distribuição geográfica consideravelmente ampliada ate o Rio de Janeiro. A presença de I. balthica e E. filiformes na região e seguramente confirmada. Finalmente, são figurados o macho e a fêmea da espécie R. signata, ao mesmo tempo em que são fornecidos detalhes sobre sua ocorrência.

  7. Reproductive cycle of Macrobrachium amazonicum females (Crustacea, Palaemonidae

    Directory of Open Access Journals (Sweden)

    CMS. Sampaio

    Full Text Available Macrobrachium amazonicum is considered a favorite Brazilian species of freshwater prawn for cultivation as a result of its quick development and because it is easy to maintain in captivity. The aim of this work is to describe the sexual cycle stages and determine maturation age of the female M. amazonicum, which was collected monthly from June, 2002 to May, 2003 in the Jaguaribe River, Itaiçaba, Ceará. A monthly sample of water was also collected to determine the following parameters: temperature, dissolved oxygen, pH and salinity. A monthly sample of females was selected among the individuals caught, to determine the total weight (W T, carapace length (L C and abdomen+telson length (L A+T and to register the number of non-ovigerous females (NOF and ovigerous females (OF. Determining ovarian maturation stages of M. amazonicum was done in a laboratory by observing macroscopic characters such as coloring, size, location and appearance of ovarians examined by transparent carapace. The first maturation age was determined from the relative frequency of the total length (L T of young and adult females. The environmental parameters of the Jaguaribe River did not hold any influence in the number of individuals collected. A total of 1,337 prawns were sampled, 513 males (38.4% and 824 females (61.6%. The proportion between males and females in the studied population was of 1:1.6. Among the collected females, 492 (50.7% did not carry eggs in their abdomens (NOF and 332 (40.3% carried eggs in their abdomens (OF. There was no record of intact females. Non-ovigerous females with mature ovaries were recorded throughout all the months of collection. The female ovaries were classified as immature (IM, rudimentary (RU, intermediary (IN and mature (M. M. amazonicum females reach their first sexual maturity between 4.5 and 5.5 cm of total length.

  8. Reproductive cycle of Macrobrachium amazonicum females (Crustacea, Palaemonidae).

    Science.gov (United States)

    Sampaio, C M S; Silva, R R; Santos, J A; Sales, S P

    2007-08-01

    Macrobrachium amazonicum is considered a favorite Brazilian species of freshwater prawn for cultivation as a result of its quick development and because it is easy to maintain in captivity. The aim of this work is to describe the sexual cycle stages and determine maturation age of the female M. amazonicum, which was collected monthly from June, 2002 to May, 2003 in the Jaguaribe River, Itaiçaba, Ceará. A monthly sample of water was also collected to determine the following parameters: temperature, dissolved oxygen, pH and salinity. A monthly sample of females was selected among the individuals caught, to determine the total weight (W(T)), carapace length (L( C)) and abdomen+telson length (L(A+T)) and to register the number of non-ovigerous females (NOF) and ovigerous females (OF). Determining ovarian maturation stages of M. amazonicum was done in a laboratory by observing macroscopic characters such as coloring, size, location and appearance of ovarians examined by transparent carapace. The first maturation age was determined from the relative frequency of the total length (L(T)) of young and adult females. The environmental parameters of the Jaguaribe River did not hold any influence in the number of individuals collected. A total of 1,337 prawns were sampled, 513 males (38.4%) and 824 females (61.6%). The proportion between males and females in the studied population was of 1:1.6. Among the collected females, 492 (50.7%) did not carry eggs in their abdomens (NOF) and 332 (40.3%) carried eggs in their abdomens (OF). There was no record of intact females. Non-ovigerous females with mature ovaries were recorded throughout all the months of collection. The female ovaries were classified as immature (IM), rudimentary (RU), intermediary (IN) and mature (M). M. amazonicum females reach their first sexual maturity between 4.5 and 5.5 cm of total length.

  9. Review of Palaemoninae (Crustacea: Decapoda: Caridea) from Vietnam, Macrobrachium excepted

    NARCIS (Netherlands)

    Xuan, Van N.

    1992-01-01

    An account is presented of the species of Palaemoninae known from Vietnam, the genus Macrobrachium excluded. Of each species a description or descriptive notes are provided, and the habitat and economic importance are discussed. Illustrations of each species, two of which are new to science, are

  10. Fecundity and fertility of Macrobrachium amazonicum (Crustacea, Palaemonidae

    Directory of Open Access Journals (Sweden)

    R. R. da Silva

    Full Text Available In Brazil, studies with native freshwater prawn species were discontinued due to great importance of Macrobrachium rosenbergii. Therefore, it is necessary to continue investigations about our species, in order to develop technology adequate to our reality and in a future allow prawn farmers to culture other species. The aim of this study was to determine the fecundity and fertility of Macrobrachium amazonicum captured monthly from June 1999 to June 2001 from Jaguaribe River, Itaiçaba, Ceará, Brazil. Prawns were collected using fishing net and transferred at Biological Science Laboratory, Ceará State University (Fortaleza, Ceará, Brazil. Among the ovigerous M. amazonicum females, 60 were randomly selected to determine fecundity. The eggs adhered to the pleopods were taken out and they were then placed in a Gilson solution, and then stored in alcohol 70%. Individual fecundity was determined from the total egg counting, using a stereoscopic microscope. To determine fertility, ovigerous M. amazonicum females were stored in individual 10 L-glass tanks maintained under strong aeration. After the hatching, the larvae were siphoned and counted. The data referring to total length and weight of all the females, storage date, coloration and number of eggs, weight and coloration of gonad and number of hatched larvae were noted. With respect to average fecundity (F by length classes, the lowest and highest number of eggs observed was 696 and 1,554, respectively. As for fecundity by weight classes, the lowest number of eggs observed was 760 and the highest, 1,690. The highest number of eggs observed individually per hatching was 2,193. Average fecundity/total length (L and average fecundity/total weight (W may be expressed by a linear relationship. The adjusted equations are: F = -411.6 + 203.1 L (p < 0.0001 and F = 566.4 + 157.3 W (p < 0.0001, respectively. In the analysis of average fertility (N per length classes, the lowest and highest number of larvae observed was 374 and 1,301, respectively. With respect to fertility per weight classes, the lowest number of larvae was 581 and the highest, 1,391. In this work, the maximum number of larvae observed per hatching for females kept in laboratory was 2,594. Average fertility/total length and average fertility/total weight may be expressed by a linear relationship. The adjusted equations are: N = -1042.7 + 264.9 L (p < 0.0002; N = 384.1 + 160.3 W (p < 0.003. From these results we can deduced that fecundity and fertility of M. amazonicum are lower than ones commercial species, nevertheless it can be captured during all year long. The number of captured prawns was large in the months whose level of water was low; the inverse was observed in the months that the river was with a high volume of water.

  11. Fecundity and fertility of Macrobrachium amazonicum (Crustacea, Palaemonidae).

    Science.gov (United States)

    Da Silva, R R; Sampaio, C M S; Santos, J A

    2004-08-01

    In Brazil, studies with native freshwater prawn species were discontinued due to great importance of Macrobrachium rosenbergii. Therefore, it is necessary to continue investigations about our species, in order to develop technology adequate to our reality and in a future allow prawn farmers to culture other species. The aim of this study was to determine the fecundity and fertility of Macrobrachium amazonicum captured monthly from June 1999 to June 2001 from Jaguaribe River, Itaiçaba, Ceará, Brazil. Prawns were collected using fishing net and transferred at Biological Science Laboratory, Ceara State University (Fortaleza, Ceará, Brazil). Among the ovigerous M. amazonicum females, 60 were randomly selected to determine fecundity. The eggs adhered to the pleopods were taken out and they were then placed in a Gilson solution, and then stored in alcohol 70%. Individual fecundity was determined from the total egg counting, using a stereoscopic microscope. To determine fertility, ovigerous M. amazonicum females were stored in individual 10 L-glass tanks maintained under strong aeration. After the hatching, the larvae were siphoned and counted. The data referring to total length and weight of all the females, storage date, coloration and number of eggs, weight and coloration of gonad and number of hatched larvae were noted. With respect to average fecundity (F) by length classes, the lowest and highest number of eggs observed was 696 and 1,554, respectively. As for fecundity by weight classes, the lowest number of eggs observed was 760 and the highest, 1,690. The highest number of eggs observed individually per hatching was 2,193. Average fecundity/total length (L) and average fecundity/total weight (W) may be expressed by a linear relationship. The adjusted equations are: F = -411.6 + 203.1 L (p amazonicum are lower than ones commercial species, never-the-less it can be captured during all year long. The number of captured prawns was large in the months whose level of water was low; the inverse was observed in the months that the river was with a high volume of water.

  12. Behavioral repertory of Trichodactylus panoplus (Crustacea: Trichodactylidae under laboratory conditions

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    Bianca L. Zimmermann

    2009-03-01

    Full Text Available This work describes the behavioral repertory of Trichodactylus panoplus von Martens, 1869, based on the animals' diel activity and the possible substrate preference under laboratory experiments. Three experimental replicates were carried out, each using six animals (three males and three females. There were four periods of observation a day, with a total of 864 observation sessions and 144 hours of experiments. A total of 15 behavioral acts divided into five categories were recorded: feeding, exploration of the environment, immobility, social interaction, and self-grooming. The obtained results suggest that T. panoplus has greater activity during the night (p < 0.05, yet without showing an activity peak. In addition, the acceptance of food does not depend on the photoperiod. There was a significant preference for gravel as the chosen substrate. The Morisita index indicates an aggregated distribution of these animals, confirming their preference for substrate with gravel. The increase in activity at night and the preference for substrate with gravel, which can be used to disguise these individuals, would be associated to some anti-predator strategies of these crabs against visually orientated predators.

  13. Introduction to some species of Argulus (Crustacea: Branchiura ...

    African Journals Online (AJOL)

    Journal of Applied Sciences and Environmental Management. Journal Home · ABOUT THIS JOURNAL · Advanced Search · Current Issue · Archives · Journal Home > Vol 21, No 7 (2017) >. Log in or Register to get access to full text downloads.

  14. Redescription of Coralliocaris brevirostris Borradaile, 1898 (Crustacea, Decapoda, Pontoniinae)

    NARCIS (Netherlands)

    Holthuis, L.B.

    1965-01-01

    In 1898 Borradaile described a new species of Coralliocaris from Funafuti, Ellice Islands. The original diagnosis was very short, but one year later Borradaile (1899: 1006, pl. 64 fig. 7) gave a slightly longer description and illustrations. No new finds of the species have been reported upon since

  15. The tantulocarid genus Arcticotantalus removed from Basipodellidae into Deoterthridae (Crustacea

    DEFF Research Database (Denmark)

    Knudsen, Steen Wilhelm; Kirkegaard, Maja; Olesen, JØrgen

    2009-01-01

    is tentatively placed in Deoterthridae based on the mode of formation of the male trunk sac, the pattern of ornamentation on the tergites and cephalic shield, and the number of setae on the thoracopods and caudal rami. It is suggested that the genus Arcticotantulus Kornev, Tchesunov & Rybnikov, 2004 is removed...

  16. Some Pontoniinae (Crustacea: Decapoda: Palaemonidae) from southern Oman

    NARCIS (Netherlands)

    Holthuis, L.B.

    1986-01-01

    Six species of Pontoniinae from Oman are dealt with; two are commensals of Lamellibranchia (Neoanchistus nasalis new species in Chlamys townsendi, Conchodytes meleagrinae Peters in Pinctada radiata), two are commensals on madrepore corals (Philarius gerlachei (Nobili) on Acropora, Jocaste lucina

  17. Embriologia do siri Arenaeus cribrarius (Lamarck (Crustacea, Brachyura, Portunidae Embryology of the swimming crab Arenaeus cribrarius (Lamarck (Crustacea, Brachyura, Portunidae

    Directory of Open Access Journals (Sweden)

    Marcelo A.A. Pinheiro

    2002-06-01

    Full Text Available Ovigerous females of Arenaeus cribrarius were collected at Ubatuba, São Paulo, and maintaining in aquaria under controlled temperature (25±1ºC, salinity (35±1‰ and photoperiod (12:12. A small sample of eggs was collected for each 24h, for morphological description, chromatic changes and biometric analysis throughout the embryonic development. Eight egg stages were photographed and had their small and large diameters measured under a microscope provided with camera lucida. The egg's shape was low elliptical during all the embryogenesis and showed size increase (24.4% and volume (91.1 %, when the last stage were compared with the first one. According to mean egg diameter and volume, the eggs should be pooled in three different groups (1-3; 4-6; 7-8 corresponding to initial, intermediate and final stages. The attained results were compared with the literature which emphasizing the species of Portunidae's family.

  18. Morfologia setal de Parastacus brasiliensis (von Martens (Crustacea, Decapoda, Parastacidae Setae morphology of Parastacus brasiliensis (von Martens (Crustacea, Decapoda, Parastacidae

    Directory of Open Access Journals (Sweden)

    Ana Cristina Moura Horn

    2004-12-01

    Full Text Available A familia Parastacidae compreende os crustáceos límnicos popularmente conhecidos como lagostins da água doce. Parastacus Huxley, 1879 é o único gênero que ocorre no Brasil, e inclui, no estado do Rio Grande do Sul, a espécie endêmica, Parastacus brasiliensis (von Martens, 1869. Os espécimes foram coletados com armadilhas em um arroio nas cabeceiras da bacia do Rio Gravataí, município de Taquara, Rio Grande do Sul, Brasil. Os animais capturados foram transportados até o Laboratório de Crustáceos Universidade Federal do Rio Grande do Sul e criados em aquários até atingirem o estado adulto. Os espécimes foram dissecados e suas estruturas examinadas por microscopia óptica e desenhados em câmara clara. O material foi ainda preparado para fotografia sob exame com microscópio eletrônico de varredura. Procedeu-se à análise e classificação de todos tipos de setas encontradas nas formas adultas de P. brasilieinsis.The family Parastacidae comprises the limnic crustaceans popularly known as crayfishes or crawfishes. Parastacus Huxley, 1879 is the only genus occurring in Brazil and has an endemic species, Parastacus brasiliensis (von Martens,1869, in Rio Grande do Sul State. The individuals were collected with traps from a brook in the springs of Gravataí basin, Taquara, Rio Grande do Sul State, Brazil. The captured animals were taken to the Universidade Federal do Rio Grande do Sul Carcinology Laboratory and raised to full growth in aquaria. The specimens were dissected, and the setae analysed under optical microscopy and drawn with the aid of a camera lucida. Material was prepared for photography under scanning electron microscope. The analysis and classification of all types of setae in the adult forms of P. brasilieinsis was performed.

  19. Interactive effect of elevated pCO2 and temperature on the larval development of an inter-tidal organism, Balanus amphitrite Darwin (Cirripedia: Thoracica)

    Digital Repository Service at National Institute of Oceanography (India)

    Baragi, L.V.; Anil, A.C.

    inter-tidal organism, to investigate the effect of these variables on its larval development and metamorphosis. Four alternate combinations of temperature and pCO2: (1) control (~30 °C and ~400 μatm); (2) elevated pCO2 (~30 °C...

  20. Exoskeletal proteins from the crab, Cancer pagurus

    DEFF Research Database (Denmark)

    Andersen, Svend Olav

    1999-01-01

    Crustacea; decapods; cuticle; exoskeleton; structural protein; amino acid sequence; mass spectrometry......Crustacea; decapods; cuticle; exoskeleton; structural protein; amino acid sequence; mass spectrometry...

  1. The Purisima Formation at Capitola Beach, Santa Cruz County, CA: A Deeper Examination of Pliocene Fossils

    Science.gov (United States)

    White, L. D.; Brooks, K.; Chen, R.; Chen, T.; James, T.; Gonzales, J.; Schumaker, D.; Williams, D.

    2005-12-01

    Fossil samples from the Pliocene Purisima Formation at Capitola Beach in Santa Cruz County, CA were collected in July-August 2005. The Purisima Formation composes the bulk of the cliffs exposed at Capitola Beach and a rich assemblage of well-preserved fossils occur in gray to brown sandstone and siltstone. Erosion of the cliff face averages 0.3 meter/year and fresh cliff falls in the winter and spring months of 2005 provided an excellent opportunity to resample the Capitola Beach section of the Purisima Formation previously documented by Perry (1988). Organisms were identified from information in Perry (1988) and were compared with collections at the California Academy of Sciences. The most abundant fossils found are from the phylum Mollusca, classes Bivalvia and Gastropoda. Abundant bivalve taxa are: Anadara trilineata, Clinocardium meekianum, Macoma sp., Protothaca staleyi, and Tresus pajaroanus. Also common are the gastropods, Calyptraea fastigata, Crepdiula princeps, Mitrella gausapata, Nassarius grammatus, Nassarius californianus, Natica clausa, and Olivella pedroana. Less common invertebrate fossils are from the phylum Echinodermata ( Dendraster sp., the extinct fossil sand dollar) and from the phylum Arthropoda ( Crustacea), crab fragments ( Cancer) and barnacles ( Balanus). Because numerous fossils are concentrated as fragments in shell beds, Norris (1986) and Perry (1988) believe many were redeposited as storm beds during strong current events that promoted rapid burial. In contrast, whale and other vertebrate bones are common in certain horizons and their presence may be related to the conditions that promoted phosphate mineralization, such as episodes of low sedimentation rates and prolonged exposure on the seafloor (Föllmi and Garrison, 1991). The bone beds, together with the rich infaunal and epifaunal invertebrate assemblages, represent a community of invertebrate organisms that thrived in a shallow marine sea during the Pliocene epoch, approximately

  2. Tanaidáceos (Crustacea: Peracarida de los litorales de Guerrero y Oaxaca, México Littoral tanaidaceans (Crustacea: Peracarida from Guerrero and Oaxaca, Mexico

    Directory of Open Access Journals (Sweden)

    Jani Jarquín-González

    2010-10-01

    Full Text Available Los tanaidáceos son componentes esenciales de las cadenas tróficas del bentos marino, son fuente de alimento para especies de relevancia comercial y para otros organismos marinos. A pesar de su importancia, el conocimiento del grupo se ha rezagado debido a los problemas relacionados con su biología y taxonomía, y por la carencia de muestreos exhaustivos y sistemáticos; así, en las costas de Guerrero y Oaxaca sólo se había registrado 1 género. Por lo anterior, el objetivo fue conocer la composición específica y los patrones de distribución de los tanaidáceos litorales de Guerrero y Oaxaca. De 4 275 ejemplares, se identificaron 6 familias y 9 morfotipos: Hexapleomera robusta, Sinelobus stanfordi, Leptochelia cf. dubia, Paratanais cf. denticulatus, Paradoxapseudes cf. garthi, Apseudormorpha sp., Cyclopoapseudes cf. indecorus, Synapseudes sp. y Parapseudes pedispinis. Todos son registros nuevos para el litoral de Guerrero y Oaxaca. Se amplía el intervalo de distribución hacia el norte, para H. robusta de islas Galápagos a Guerrero. Para S. stanfordi y P. pedispinis se proporcionan localidades intermedias que rompen con la distribución disyunta previa en el Pacífico oriental. Hay 6 especies, posiblemente nuevas, con distribución restringida; 2 son de amplia distribución y 1 restringida al Pacífico oriental tropical.The tanaidaceans are essential components in food chains of marine benthos, since they are the main food source for commercially important species and other marine organisms. Despite their importance, problems related to their biology and taxonomy have delayed the understanding of the group, as observed on the coasts of Guerrero and Oaxaca, where only 1 genus was previously known. The aim was to determine the species richness and distribution patterns of littoral tanaids from Guerrero and Oaxaca. A total of 4 275 specimens were collected and 6 families and 9 morphotypes have been identified: Hexapleomera robusta, Sinelobus stanfordi, Leptochelia cf. dubia, Paratanais cf. denticulatus, Paradoxapseudes cf. garthi, Apseudormorpha sp., Cyclopoapseudes cf. indecorus, Synapseudes sp. and Parapseudes pedispinis. All species are new records for the littorals of Guerrero and Oaxaca. Hexapleomera robusta increased the range distribution to the north, from the Galapagos to Guerrero; and S. stanfordi and P. pedispinis are the first intermediate records for a previously disjunct distribution in the East Pacific. With respect to the distribution patterns, 6 species have restricted distribution, represented by possible new species; 2 species have a wider distribution, and 1 species has restricted distribution to the tropical eastern Pacific.

  3. Fertilizers for Daphnia sp. (Crustacea, Cladocera production in experimental tanks Fertilizantes para produção de Daphnia sp. (Crustacea, Cladocera em tanques experimentais

    Directory of Open Access Journals (Sweden)

    Patrícia de Souza Lima Cunha

    2010-05-01

    Full Text Available The current study was aimed at investigating the use of different fertilizers - dicalcium phosphate, biosolid and quail feces - as a strategy for water fertilization in Daphnia sp production. It was used twenty-four 100-L tanks of asbestos cement distributed in a completely randomized split-plot design with six replicates, with plots in the three kinds of fertilizers (biosolid, dicalcium phosphate, and quail feces and a control without fertilization (WF and subplots at the times of assessment (days 8 and 13. It was assessed the biomass production of Daphnia sp. and the following water quality parameters: chlorophyll a, electrical conductivity, pH, dissolved oxygen, temperature, ammonia and organic nitrogen, total phosphorus and total hardness. There was a significant correlation between the values of chlorophyll a and biomass weight of Daphnia sp, which indicates interactions between phytoplankton and zooplankton communities. The maximum weight of Daphnia sp. biomass is found in tanks fertilized with quail feces (35.98 g, followed by the biosolid (16.80 g, control without fertilization (6.75 g and dicalcium phosphate (5.24 g.Este trabalho foi conduzido com o objetivo de avaliar a utilização de fertilizantes - fosfato bicálcico, biossólido e fezes de codorna - na água de produção de Daphnia sp. Foram utilizados 24 tanques de cimento-amianto, cada um com volume útil de 100 L, em um delineamento inteiramente ao acaso em parcelas subdivididas com seis repetições, tendo nas parcelas os tipos de fertilizantes e um controle, sem adubação, e nas subparcelas as épocas de avaliação (dias 8 e 13. Foram avaliados a produção da biomassa de Daphnia sp. e os seguintes parâmetros de qualidade da água: clorofila a, condutividade elétrica, pH, oxigênio dissolvido, temperatura, nitrogênio amoniacal e orgânico, fósforo total e dureza total. Observou-se correlação significativa entre os valores de clorofila a e o peso da biomassa de Daphnia sp., o que indica interação entre as comunidades fito e zooplanctônicas. O peso máximo da biomassa de Daphnia sp. em tanques adubados com fezes de codorna é maior (35,98 g que em tanques adubados com biossólido (16,80 g, sem adubação (6,75 g ou adubados com fosfato bicálcico (5,24 g.

  4. Desenvolvimento juvenil de Cyrtograpsus angulatus Dana (Crustacea, Decapoda, Grapsidae, em laboratório Juvenile development of Cyrtograpsus angulatus Dana (Crustacea, Decapoda, Grapsidae, in laboratory

    Directory of Open Access Journals (Sweden)

    Paulo Juarez Rieger

    2000-06-01

    Full Text Available This paper describes the first nine juvenile stages of Cyrtograpsus angulatus Dana, 1851 obtained in laboratory conditions from three ovigerous females collected at "Molhes da Barra", Rio Grande, Brazil (32ºS and 52ºW. The main morphological features, the secondary sexual characters and the gills ontogeny were observed. Twenty one individuals reached until the ninth juvenile stage. Sexual dimorphism can be verified from the fourth juvenile stage and the number of gills are complete at the second juvenile stage.

  5. Primeiro estágio juvenil de Aegla prado Schmitt (Crustacea, Decapoda, Anomura, Aeglidae The first juvenil stage of Aecla prado Schmitt (Crustacea, Decapoda, Anomura, Aeglidae

    Directory of Open Access Journals (Sweden)

    Georgina Bond-Buckup

    1996-01-01

    Full Text Available The first juvenil stage of Aegla prado Schimitt, 1942 is described and illustrated. The species A. prado showed a direct development, without the swimming free larval form. The most important appendages of the first juvenile stage were analysed: first and second antenna, mandible, first, second and third maxillipeds, first and fifth pereopods, telson and uropods. Setal formula for the first stage and setae characteristics are presented.

  6. Crescimento de Aegla jarai Bond-Buckup & Buckup (Crustacea, Anomura, Aeglidae Growth of Aegla jarai Bond-Buckup & Buckup (Crustacea, Anomura, Aeglidae

    Directory of Open Access Journals (Sweden)

    Harry Boos Jr

    2006-06-01

    Full Text Available O crescimento de Aegla jarai foi analisado com objetivo de contribuir com informações referentes ao perfil bio-ecológico do caranguejo. As coletas foram realizadas de julho de 2001 a setembro de 2002 no Ribeirão Espíngarda, localizado no Parque Nacional da Serra do Itajaí, Santa Catarina, Brasil. Os espécimes foram separados por sexo e medidos quanto ao comprimento do cefalotórax e, após a biometria, devolvidos ao ribeirão. O modelo de von Bertalanffy foi utilizado para estimar o crescimento em tamanho através da progressão das modas resultando nas curvas de crescimento Ct = 25,11 [1- e - 0,0082 (t + 29,02] (para os machos e Ct = 23,33 [1- e - 0,0048 (t + 46,45] (para as fêmeas. As curvas baseadas nas médias também foram obtidas: Ct = 23,56 [1- e - 0,0101 (t + 19] (para os machos e Ct = 22,69 [1- e - 0,0052 (t + 40,95] (para as fêmeas. O recrutamento estendeu -se durante a primavera (outubro, novembro e dezembro e no início do verão (janeiro. Na população de A. jarai, os machos atingiram tamanhos superiores e apresentaram uma taxa de crescimento maior do que as fêmeas. A longevidade, para ambos os sexos, foi estimada em dois anos.The growth of Aegla jarai was examined aiming to contribute with information about the bioecological profile of the species. The sampling was carried out at the Espíngarda River system situated at the Parque Nacional da Serra do Itajaí, Santa Catarina State, Brazil from July 2001 to September 2002. The sex and the length of cephalothorax (mm were recorded and the specimens were brought back to the stream. The von Bertalanffy's model was used to estimate growth based on the modal progression of the size, which resulted in the growth curves described by Lt = 25.11 [1- e - 0.0082 (t + 29.02] (for the males and Lt = 23.33 [1- e - 0.0048 (t + 46.45] (for the females. The curves based on the means were also obtained which were Lt = 23.56 [1- e - 0.0101 (t + 19] (for the males and Lt = 22.69 [1- e - 0.0052 (t + 40.95] (for the females. The recruitment period extended throughout spring (October, November and December and early summer (January. In the population of A. jarai the males attained larger sizes and a higher growth rate than females. The estimated longevity was two years for both sexes.

  7. Biologia reprodutiva e ecologia de Aegla leptoaectyla Buckup & Rossi (Crustacea, Anomura, Aeglidae Biology and ecology of Aegla leptodactyla Buckup & Rossi (Crustacea, Anomura, Aeglidae

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    Clarissa Köhler Noro

    2002-12-01

    Full Text Available The crustaeeans of Aeglidae family oeeur in South America's fresh water enviranments, featuring as important links in the food chains. The present article has the intention to give an acount of the results from investigations made from April/2000 to July/2001 on the biological and ecological features of Aegla leptodactyla Buckup & Rossi, 1977, an endemic species from the headwaters of the Rio Pelotas Basin in Rio Grande do Sul State, Brazil. The sampling was performed at the Rio da Divisa, tributary of Rio Pelotas, municipal district of São José dos Ausentes, Rio Grande do Sul. The animais were collected with a hand net (puçá at four different sites of the river. High contents of dissolved oxygen was verified, with a medium value of 108% and alow conductivity (avarage of 13.7mS/cm. The water mean temperature was 16ºC and the pH remained neutral, average of 7.5. The velocity of the water current varied from 0.54 to 0.78m/s. A total of 1,323 males and 1,112 females of A. leptodactyla was sampled. Ovigerous females were observed from April through September and the smallest egg bearing female measured 14.09 mm cephalothorax length. The recruitment took place in November and December. The sex-ratio of the population was 1.19 males for 1 female.

  8. Atividade nictimeral e tempo de digestão de Aegla longirostri (Crustacea, Decapoda, Anomura Diel activity and digestion time of Aegla longirostri (Crustacea, Decapoda, Anomura

    Directory of Open Access Journals (Sweden)

    Carolina C. Sokolowicz

    Full Text Available O objetivo do presente trabalho foi caracterizar o ritmo de atividade e tempo de digestão em Aegla longirostri Bond-Buckup & Buckup, 1994. Os animais foram coletados em Santa Maria, RS, Brasil. Em laboratório, os animais foram transferidos para aquários individuais (5L. Para testar a atividade locomotora e alimentar dos aeglídeos um grupo de animais permaneceu sob luminosidade constante durante 12 horas, enquanto outro grupo permanecia no escuro, essa condição sendo invertida a cada 12 horas. As observações foram realizadas a cada 6 horas. Para determinar o tempo de digestão os animais foram alimentados e a cada 30 minutos um indivíduo era sacrificado. Aegla longirostri mostrou menor atividade em períodos de luminosidade, o que aconteceu nos dois grupos de animais. Essa espécie leva aproximadamente 5 horas para concluir a digestão extracelular. Os resultados sugerem que A. longirostri possui hábitos noturnos e provavelmente se alimenta sempre que há recursos disponíveis.The aim of this work was to characterize the diel activity rhythm and time of digestion in Aegla longirostri Bond-Buckup & Buckup, 1994. The individuals were collected in Santa Maria, RS, Brazil. In laboratory, the animals were kept in individuals glass aquariums (5L. To test locomotor and feeding activity of the aeglids, a group remained under constant luminosity for 12 hours, while another group was mantained in the dark, this condition being reversed at each 12 hours. The observations were taken at every 6 hours. For the determination of digestion's time the animals were fed, and one individual was sacrificed at each 30 minutes. Aegla longirostri showed lower activity in periods of light time. This condition was recorded for both groups of animals. This species takes approximately 5 hours to conclude its extracellular digestion. The results suggest that A. longirostri has nocturnal habits and probably feeds whenever resources are available.

  9. Palaemonidae (Crustacea: Decapoda: Caridea from the shallow waters from Quintana Roo, Mexican Caribbean coast Palaemonidae (Crustacea: Decapoda: Caridea de las aguas someras de Quintana Roo, Caribe mexicano

    Directory of Open Access Journals (Sweden)

    Ramiro Román-Contreras

    2010-04-01

    Full Text Available Few studies have focused on the palaemonid fauna of the Mexican Caribbean. This study provides a list of shallow water free-living and symbiont shrimps of the family Palaemonidae collected on turtle grass (Thalassia testudinum in Bahía de la Ascensión, Bahía del Espíritu Santo and Mahahual reef lagoon, Quintana Roo, Mexico. Ten species in 8 genera are reported, of which the genus Periclimenes is the most diverse with 3 species. An updated geographic distribution along the western Atlantic and other regions is provided for all the species. The greatest affinity of the palaemonid fauna studied, besides that with the Caribbean province, is with the Brazilian, Argentinian, and Texan zoogeographic provinces. Of the 10 species reported in this paper, 8 represent new local records in the studied area.Los crustáceos de la familia Palaemonidae del Caribe mexicano han sido poco estudiados. En este trabajo se presenta un listado de palemónidos de vida libre y simbiontes recolectados en el pasto marino Thalassia testudiuim de Bahía de la Ascensión, Bahía del Espíritu Santo y la laguna arrecifal de Mahahual, Quintana Roo, México. Se registran 10 especies pertenecientes a 8 géneros, siendo el género Periclimenes el más diverso con 3 especies. Para todas las especies se proporciona su distribución geográfica en la costa del Atlántico americano así como en otras regiones. Además de la provincia Caribeña, los palemónidos recolectados también muestran alta afinidad con otras provincias zoogeográficas como la Brasileña, Argentina y Texana; de las 10 especies registradas en este estudio, 8 representan nuevo registro local en el área estudiada.

  10. Palaemonidae (Crustacea: Decapoda: Caridea) from the shallow waters from Quintana Roo, Mexican Caribbean coast Palaemonidae (Crustacea: Decapoda: Caridea) de las aguas someras de Quintana Roo, Caribe mexicano

    OpenAIRE

    Ramiro Román-Contreras; Mario Martínez-Mayén

    2010-01-01

    Few studies have focused on the palaemonid fauna of the Mexican Caribbean. This study provides a list of shallow water free-living and symbiont shrimps of the family Palaemonidae collected on turtle grass (Thalassia testudinum) in Bahía de la Ascensión, Bahía del Espíritu Santo and Mahahual reef lagoon, Quintana Roo, Mexico. Ten species in 8 genera are reported, of which the genus Periclimenes is the most diverse with 3 species. An updated geographic distribution along the western Atlantic an...

  11. Larval development and post-settlement metamorphosis of the barnacle Balanus albicostatus Pilsbry and the serpulid polychaete Pomatoleios kraussii Baird: Impact of a commonly used antifouling biocide, Irgarol 1051

    Digital Repository Service at National Institute of Oceanography (India)

    Khandeparker, L.; Desai, D.V.; Shirayama, Y.

    Nauplii that survived to the cyprid instar stage when reared in the presence of Irgarol 1051 showed prolonged instar and total naupliar duration when compared to the controls The post-settlement metamorphosis of cyprids significantly varied with Irgarol...

  12. A new spelaeogriphacean (Crustacea: Peracarida) from the Upper Jurassic of China

    NARCIS (Netherlands)

    Yan-bin, Shen; Taylor, Rod S.; Schram, Frederick R.

    1998-01-01

    A new monotypic genus of Spelaeogriphacea is described from the Upper Jurassic of Liaoning Province, north-east China. This new genus and species brings the number of known spelaeogriphacean taxa to four, the others being two recent forms from Brazil and South Africa, and one from the Carboniferous

  13. Pesticide resistance from historical agricultural chemical exposure in Thamnocephalus platyurus (Crustacea: Anostraca).

    Science.gov (United States)

    Brausch, John M; Smith, Philip N

    2009-02-01

    Extensive pesticide usage in modern agriculture represents a considerable anthropogenic stressor to freshwater ecosystems throughout the United States. Acute toxicity of three of the most commonly used agricultural pesticides (Methyl Parathion 4ec, Tempo SC Ultra, Karmex DF, and DDT) was determined in two different wild-caught strains of the fairy shrimp Thamnocephalus platyurus. Fairy shrimp collected from playas surrounded by native grasslands were between 200% and 400% more sensitive than fairy shrimp derived from playas in agricultural watersheds for Methyl Parathion 4ec, Tempo SC Ultra, and Karmex DF, likely due to the development of resistance. Additionally, reduced sensitivity to DDT was observed among fairy shrimp from agriculturally-impacted playas as compared to those from native grassland-dominated playas. These data suggest that fairy shrimp inhabiting playas in agricultural regions have developed some degree of resistance to a variety of agrochemicals in response to historical usage.

  14. Acute toxicity of organophosphate fenitrothion on biomarkers in prawn Palaemonetes argentinus (Crustacea: Palaemonidae).

    Science.gov (United States)

    Lavarías, S; García, C F

    2015-03-01

    The effect of the organophosphate fenitrothion (FS) on the non-target freshwater prawn Palaemonetes argentinus was studied. Initially, the 96-h lethal concentration (LC50) of FS was determined in adult prawns. Inhibition of cholinesterase (ChE) in the muscle and hemolymph was assessed. Then, in the hepatopancreas, the activities of superoxide dismutase (SOD), catalase (CAT), and glutathione-S-transferase (GST) were analyzed. Lipid peroxidation (LPO) was also determined in the hepatopancreas. The 96-h LC50 value was 1.12 μg/L. Hemolymph ChE activity showed a significant decrease in exposed prawns to FS compared to the control group, while no significant differences in the muscle were observed between groups (p pesticide (p < 0.05). These results indicate that P. argentinus is very sensitive to organophosphorus which alter biochemical parameters that are related to antioxidant status. Thus, these parameters could be used as biomarkers for assessing water pollution.

  15. Effects of late-cenozoic glaciation on habitat availability in Antarctic benthic shrimps (Crustacea: Decapoda: Caridea.

    Directory of Open Access Journals (Sweden)

    Johannes Dambach

    Full Text Available Marine invertebrates inhabiting the high Antarctic continental shelves are challenged by disturbance of the seafloor by grounded ice, low but stable water temperatures and variable food availability in response to seasonal sea-ice cover. Though a high diversity of life has successfully adapted to such conditions, it is generally agreed that during the Last Glacial Maximum (LGM the large-scale cover of the Southern Ocean by multi-annual sea ice and the advance of the continental ice sheets across the shelf faced life with conditions, exceeding those seen today by an order of magnitude. Conditions prevailing at the LGM may have therefore acted as a bottleneck event to both the ecology as well as genetic diversity of today's fauna. Here, we use for the first time specific Species Distribution Models (SDMs for marine arthropods of the Southern Ocean to assess effects of habitat contraction during the LGM on the three most common benthic caridean shrimp species that exhibit a strong depth zonation on the Antarctic continental shelf. While the shallow-water species Chorismus antarcticus and Notocrangon antarcticus were limited to a drastically reduced habitat during the LGM, the deep-water shrimp Nematocarcinus lanceopes found refuge in the Southern Ocean deep sea. The modeling results are in accordance with genetic diversity patterns available for C. antarcticus and N. lanceopes and support the hypothesis that habitat contraction at the LGM resulted in a loss of genetic diversity in shallow water benthos.

  16. Role of maxilla 2 and its setae during feeding in the shrimp Palaemon adspersus (Crustacea: Decapoda)

    DEFF Research Database (Denmark)

    Garm, A; Hallberg, E; Høeg, J T

    2003-01-01

    water-filled canals, which may serve to improve flexibility. Type 1 and 3 setae have fewer sensory cells (4-9) but probably also have a bimodal sensory function. The function of type 1 setae is probably to protect type 2 setae, while type 3 setae might serve to groom the ventral side of the basis...

  17. (Crustacea: Branchiura) from a bony fish in Algoa Bay, South Africa

    African Journals Online (AJOL)

    1995-09-29

    Sep 29, 1995 ... by carapace with lobes extending over all four pairs of swim- ming legs. Sinus in carapace, 24% of carapace length. Dor- sally, sinus exposing kidney-shaped lobe on fourth thoracic segment. Compound eyes small, colourless and situated in frontal region i.e. first 25% of carapace. Nauplius eye not visible.

  18. Survey of Biofouling an Australian Navy Ships: Crustacea; Isopoda and Amphipoda; Caprellidea

    Science.gov (United States)

    2008-01-01

    Menzies. The marine isopod fauna of the Bahia de San Quintin, Baja California, Mexico . Pacific Naturalist 3:337-348, 1962. M. A. Miller. Isopoda and...the Pacific coast of continental Chile. Revista Chilena de Historia Natural 76:297-312, 2003. R. E. Thresher, C. L. Hewitt, and M. L. Campbell...Distribution: Hong Kong, California, Mexico , Hawaii, Brazil. Introduced to Australia (from USA probably). In Australia, 200 m bathymetric

  19. Diversity of the free-living marine and freshwater Copepoda (Crustacea) in Costa Rica: a review.

    Science.gov (United States)

    Morales-Ramírez, Álvaro; Suárez-Morales, Eduardo; Corrales-Ugalde, Marco; Garrote, Octavio Esquivel

    2014-01-01

    The studies on marine copepods of Costa Rica started in the 1990's and focused on the largest coastal-estuarine systems in the country, particularly along the Pacific coast. Diversity is widely variable among these systems: 40 species have been recorded in the Culebra Bay influenced by upwelling, northern Pacific coast, only 12 in the Gulf of Nicoya estuarine system, and 38 in Golfo Dulce, an anoxic basin in the southern Pacific coast of the country. Freshwater environments of Costa Rica are known to harbor a moderate diversity of continental copepods (25 species), which includes 6 calanoids, 17 cyclopoids and only two harpacticoids. Of the +100 freshwater species recorded in Central America, six are known only from Costa Rica, and one appears to be endemic to this country. The freshwater copepod fauna of Costa Rica is clearly the best known in Central America. Overall, six of the 10 orders of Copepoda are reported from Costa Rica. A previous summary by 2001 of the free-living copepod diversity in the country included 80 marine species (67 pelagic, 13 benthic). By 2009, the number of marine species increased to 209: 164 from the Pacific (49% of the copepod fauna from the Eastern Tropical Pacific) and 45 from the Caribbean coast (8% of species known from the Caribbean Basin). Both the Caribbean and Pacific species lists are growing. Additional collections of copepods at Cocos Island, an oceanic island 530 km away of the Pacific coast, have revealed many new records, including five new marine species from Costa Rica. Currently, the known diversity of marine copepods of Costa Rica is still in development and represents up to 52.6% of the total marine microcrustaceans recorded in the country. Future sampling and taxonomic efforts in the marine habitats should emphasize oceanic environments including deep waters but also littoral communities. Several Costa Rican records of freshwater copepods are likely to represent undescribed species. Also, the biogeographic relevance of the inland copepod fauna of Costa Rica requires more detailed surveys.

  20. Diversity and Distribution of Freshwater Amphipod Species in Switzerland (Crustacea: Amphipoda)

    Science.gov (United States)

    Altermatt, Florian; Alther, Roman; Fišer, Cene; Jokela, Jukka; Konec, Marjeta; Küry, Daniel; Mächler, Elvira; Stucki, Pascal; Westram, Anja Marie

    2014-01-01

    Amphipods are key organisms in many freshwater systems and contribute substantially to the diversity and functioning of macroinvertebrate communities. Furthermore, they are commonly used as bioindicators and for ecotoxicological tests. For many areas, however, diversity and distribution of amphipods is inadequately known, which limits their use in ecological and ecotoxicological studies and handicaps conservation initiatives. We studied the diversity and distribution of amphipods in Switzerland (Central Europe), covering four major drainage basins, an altitudinal gradient of>2,500 m, and various habitats (rivers, streams, lakes and groundwater). We provide the first provisional checklist and detailed information on the distribution and diversity of all amphipod species from Switzerland. In total, we found 29 amphipod species. This includes 16 native and 13 non-native species, one of the latter (Orchestia cavimana) reported here for the first time for Switzerland. The diversity is compared to neighboring countries. We specifically discuss species of the genus Niphargus, which are often receiving less attention. We also found evidence of an even higher level of hidden diversity, and the potential occurrence of further cryptic species. This diversity reflects the biogeographic past of Switzerland, and suggests that amphipods are ideally suited to address questions on endemism and adaptive radiations, post-glaciation re-colonization and invasion dynamics as well as biodiversity-ecosystem functioning relationships in aquatic systems. PMID:25354099

  1. Morphological and histological studies on the embryonic development of the freshwater prawn, Macrobrachium rosenbergii (Crustacea, Decapoda

    Directory of Open Access Journals (Sweden)

    Madlen M. Habashy

    2012-05-01

    Full Text Available The present work was carried out to describe the embryonic changes during development of the freshwater prawn Macrobrachium rosenbergii based on some morphological and histological features. In addition the biochemical composition of eggs was investigated during the embryonic development of the studied species. Results revealed that eggs of M. rosenbergii completed their development in 20 days at 28.5 ± 0.45 °C. The present investigation showed that primordial germ cells (PGCs were detected early in the examined embryos. In 6.5 days old embryo, a cluster of PGCs occupied the dorso-medial region behind the yolky portion. In addition, the biochemical data indicated that the protein content was significantly increased, while lipid and carbohydrate contents decreased during the embryonic development. The lowest water content was found in the bright orange eggs and reached its highest level in the deep brown eggs. It was noted that the increase in the water content was correlated with the increase in the egg diameters. It was also concluded that, variations in the biochemical compositions of eggs reflected changes in their morphogenesis during the embryonic development.

  2. The new species of Mysidacea (Crustacea), Anchialina labatus and Gastrosaccus sarae, from south west Australia

    Digital Repository Service at National Institute of Oceanography (India)

    Panampunnayil, S.U.

    on the third segment of the mandibular palp and by the modification of the exopod of the third pleopod of the male. G. sarae is distinguished from the other species by the shape and armature of the telson...

  3. Can contrasting environmental conditions of mangroves induce morphological variability in Aratus pisonii (Crustacea: Brachyura: Sesarmidae?

    Directory of Open Access Journals (Sweden)

    Beatriz López-Sánchez

    2016-09-01

    Full Text Available Aratus pisonii is one of the most common crab species in Neotropical mangroves. It shows great plasticity in its life history traits, which makes it an interesting subject for comparative studies. This study evaluated the morphometric variability in five populations of A. pisonii inhabiting mangroves with different degrees of structural development under contrasting environmental conditions. Mangrove forests located on the northwest coast of Venezuela were studied during the rainy season in 2006. The results showed morphometric differences and interaction between sampling sites and sex (PERMANOVA, P=0.0001, as well as the presence of five morphological groups in males and four in females. The findings support the existence of sexual dimorphism. Females from the dwarf hypersaline mangrove showed a wide variability associated with the chelipeds. The differences in crab morphology between sites seem to be related to a combination of environmental factors that is unique for each habitat, leading to the formation of different morphological groups, in which the mangrove structural development (resource availability and salinity (which compromises the energy budget play an important role. The presence of more robust chelipeds in females from the dwarf hypersaline mangrove seems to reflect an adaptation to the biomechanical properties of the leaves (sclerophylly.

  4. First Record of Cleantioides planicauda (Crustacea: Isopoda: Holognathidae from South Korea

    Directory of Open Access Journals (Sweden)

    Gi-Sik Min

    2014-01-01

    Full Text Available Cleantioides planicauda (Benedict, 1899 has previously been recorded in China and Japan. In the present study, to our knowledge, we report for the first time the occurrence of this species in South Korea. Here, we provide detailed descriptions and illustrations of the diagnostic characteristics of C. planicauda. Further, for the first time, we determined the partial sequence of mitochondrial cytochrome c oxidase subunit 1 (CO1 gene of C. planicauda for molecular characteristic. Additionally, we provide a key to the Korean species and distribution of the genus Cleantioides. As a result of this study, four species of the genus Cleantioides, including C. planicauda, have now been recorded in South Korea.

  5. Stygofauna of the Canary Islands, 9. The amphipod genus Pseudoniphargus (Crustacea) in the Canary Islands

    NARCIS (Netherlands)

    Stock, Jan H.

    1988-01-01

    Pseudoniphargus was known from inland stygohabitats in the Iberian peninsula, the Azores, Madeira, N.W. Africa, and Bermuda, but not from the Canary Islands. Systematic sampling in six of the seven larger islands of the latter archipelago has revealed the presence of the genus in Tenerife (4

  6. Feeding of the planktonic shrimp Lucifer faroni Borradaile, 1915 (Crustacea: Decapoda in the laboratory

    Directory of Open Access Journals (Sweden)

    Luz Amelia Vega-Pérez

    1996-01-01

    Full Text Available Feeding behavior of juveniles of the planktonic shrimp Lucifer faxoni Borradaile was studied in the laboratory under light and dark conditions. Newly-hatched nauplii and metanauplii of Artemio were used as prey organisms. The fecding raie of L. foxoni was dependent on prey size and prey density, but was not obviously affected by light or dark conditions. The capture of the prey tended to increase with longer exposure time to prey. The maximum ingestion rate was 17.28 and 13.40 nauplii.L. faxoni .d- , in the light and in the dark conditions, respectively.O comportamento alimentar de espécimens jovens de Lucifer faxoni Borradaile, em laboratório, sob condições de luz e escuro, foi estudado utilizando-se como alimento náuplios recém-eclodidos e metanáuplios de Artemio. Neste estudo a taxa de alimentação de L. faxoni foi influenciada pelo tamanho e concentração da presa, bem como pelo tempo de contato com a mesma. A atividade alimentar de L. faxoni foi maior em condições de luz, quando comparado com as condições de escuro. f- taxa máxima de ingestão calculada foi de 17,28 e 13,40 náuplios.L. faxoni .d- para as condições de luz e escuro, respectivamente.

  7. Justitia Holthuis, 1946 (Crustacea, Decapoda, Palinuridea) from the Middle Eocene of Verona and Vicenza (northern Italy)

    NARCIS (Netherlands)

    Garassino, Alessandro; Angeli, De Antonio

    2003-01-01

    Recently, Beschin et al. (2001) have described two specimens of palinurids, discovered at Chiampo (“Albanello” quarry, Vicenza, northern Italy). Preserved three dimensionally, these were collected from limestones of Lutetian (middle Eocene) age. The peculiar ornament of the dorsal carapace surface,

  8. Antennule development during copepodite phase of some representatives of Harpacticoida (Copepoda, Crustacea)

    NARCIS (Netherlands)

    Dahms, Hans-Uwe

    1989-01-01

    The copepodite antennule development of representatives of 6 harpacticoid families is studied and discussed in detail and that of 8 genera of harpacticoids from 7 families is schematically illustrated. Twenty-seven genera out of 17 harpacticoid families are compared on the basis of own

  9. Influencia de la temperatura en el comportamiento y color de Palaemon elegans (Rathke, 1837) (Crustacea, Decapoda)

    OpenAIRE

    Morán Ramírez, Olaia

    2012-01-01

    [ES] El camarón de charco (Palaemon elegans) soporta altos rangos de temperatura, pero a medida que ésta baja (hasta 5 ºC) comienza a reducir sus movimientos hasta quedar completamente inmóvil, casi en letargo. A este cambio de comportamiento va unido un cambio en la coloración del cuerpo del animal, que pasa de ser completamente transparente con tonos vivos azules y amarillos a ser translúcido, con azules y amarillos mucho más pálidos [EN] Rockpool shrimp (Palaemon elegans) supports high ...

  10. New hypogean cyclopoid copepods (Crustacea) from the Yucatán Peninsula, Mexico

    NARCIS (Netherlands)

    Fiers, Frank; Reid, Janet W.; Iliffe, Thomas M.; Suárez-Morales, Eduardo

    1996-01-01

    Four previously unknown hypogean species of cyclopoid copepods were collected in cenotes and wells of the Yucatán Peninsula, Mexico. Diacyclops chakan sp. n. and D. puuc sp. n. differ from their congeners in combining 3-segmented swimming legs, 11-segmented antennules, and legs 1-4 endopodite

  11. Reproductive biology of galatheoid and chirostyloid (Crustacea: Decapoda) squat lobsters from the Gulf of Mexico.

    Science.gov (United States)

    Kilgour, Morgan J; Shirley, Thomas C

    2014-01-16

    Reproductive timing, fecundity, and average egg sizes were examined for galatheoid and chirostyloid squat lobster collections from the Gulf of Mexico. While congeners did not always significantly differ in egg size or timing, each genus had a unique average egg diameter size which may indicate whether the developing embryos will be lecithotrophic or planktotrophic larvae. The eggs of Eumunididae, Galatheidae, and Munididae were more numerous and smaller than the larger and less abundant eggs of Chirostylidae and Munidopsidae. With the exception of members of the Munididae, members of genera within the same family had distinct egg diameters. Ovigerous females were significantly larger than non-ovigerous females in some species (i.e., Uroptychus nitidus, Munida forceps, Galacantha spinosa, Munidopsis abbreviata, M. alaminos, M., erinacea, M. robusta, M. sigsbei, and M. simplex). Munidopsis erinacea and Munida affinis males were significantly larger than females; the reverse was true for Munidopsis robusta and Munidopsis simplex. All other species studied did not have a significant difference between males and females. The spatial and bathymetric ranges for many species are extended in this study from prior reports. Seasonality of reproduction was evident in few species, but this may be a result of limited sample sizes.

  12. Prediction of Scylla olivacea (Crustacea; Brachyura) peptide hormones using publicly accessible transcriptome shotgun assembly (TSA) sequences.

    Science.gov (United States)

    Christie, Andrew E

    2016-05-01

    The aquaculture of crabs from the genus Scylla is of increasing economic importance for many Southeast Asian countries. Expansion of Scylla farming has led to increased efforts to understand the physiology and behavior of these crabs, and as such, there are growing molecular resources for them. Here, publicly accessible Scylla olivacea transcriptomic data were mined for putative peptide-encoding transcripts; the proteins deduced from the identified sequences were then used to predict the structures of mature peptide hormones. Forty-nine pre/preprohormone-encoding transcripts were identified, allowing for the prediction of 187 distinct mature peptides. The identified peptides included isoforms of adipokinetic hormone-corazonin-like peptide, allatostatin A, allatostatin B, allatostatin C, bursicon β, CCHamide, corazonin, crustacean cardioactive peptide, crustacean hyperglycemic hormone/molt-inhibiting hormone, diuretic hormone 31, eclosion hormone, FMRFamide-like peptide, HIGSLYRamide, insulin-like peptide, intocin, leucokinin, myosuppressin, neuroparsin, neuropeptide F, orcokinin, pigment dispersing hormone, pyrokinin, red pigment concentrating hormone, RYamide, short neuropeptide F, SIFamide and tachykinin-related peptide, all well-known neuropeptide families. Surprisingly, the tissue used to generate the transcriptome mined here is reported to be testis. Whether or not the testis samples had neural contamination is unknown. However, if the peptides are truly produced by this reproductive organ, it could have far reaching consequences for the study of crustacean endocrinology, particularly in the area of reproductive control. Regardless, this peptidome is the largest thus far predicted for any brachyuran (true crab) species, and will serve as a foundation for future studies of peptidergic control in members of the commercially important genus Scylla. Copyright © 2016 Elsevier Inc. All rights reserved.

  13. MORFOLOGIA DO VASO DEFERENTE DE Callinectes ornatus (Crustacea: Portunoidea COLETADOS NO LITORAL SUL CAPIXABA

    Directory of Open Access Journals (Sweden)

    Marina Lopes Marinho

    2017-02-01

    Full Text Available O siri azul (Callinectes ornatus é um importante recurso pesqueiro, logo conhecer as estruturas que colaboram para seu sucesso reprodutivo é essencial. Este estudo objetivou descrever o vaso deferente dos machos desta espécie de siri, por meio da microscopia de luz. A estrutura do vaso deferente é constituída por três regiões distintas: anterior (VDA revestido por epitélio cilíndrico simples e, em seu lúmen, é possível notar uma secreção acidófila; média (VDM possui epitélio cúbico simples e um grande volume de secreção em seu interior; posterior (VDP que apresenta uma camada muscular bem desenvolvida e vários espermatóforos, encontrados em vários estágios.

  14. Reproduction of Cubaris murina (Crustacea: Isopoda under laboratory conditions and its use in ecotoxicity tests

    Directory of Open Access Journals (Sweden)

    JC. Niemeyer

    Full Text Available Reproduction of the isopod Cubaris murina was studied in the laboratory in order to observe the offspring number per brood, the number and duration of the incubation periods, and the influence of repeated mating on number of young per brood. An experiment was conducted with two different groups: female/male pairs and females that were isolated after mating. No significant difference was found between the two reproductive female groups for the mean number of young per brood (x = 25 and the duration of the incubation periods (x = 17 days. One mating was enough for at least five broods, with no reduction in brood size. There was no significant difference between the number of adult males and females. Low-density cultures had a significantly higher growth rate compared to high-density cultures. Furthermore, the experimental results for optimization isopod culture conditions for terrestrial ecotoxicity testing are reported.

  15. Seasonal variability of planktonic copepods (Copepoda: Crustacea in a tropical estuarine region in Brazil

    Directory of Open Access Journals (Sweden)

    Cristina de Oliveira Dias

    2009-12-01

    Full Text Available The Caravelas River estuary and adjacent coastal region were studied during the rainy and dry seasons of 2003-2004 to assess the copepod community structure. Abiotic and biotic parameters were measured, and the total density, frequency and percentage of copepod taxa were determined for each sampling period. Copepod densities showed significant differences between sampling periods, with higher densities in the rainy seasons (Mean: 90,941.80 ind.m-3; S.D.: 26,364.79. The sampling stations located to the north and south, in the coastal region adjacent to the Caravelas River estuary presented the lowest copepod density values. The copepod assemblage was composed mainly of estuarine and estuarine/coastal copepods. The seasonal variations in temperature and salinity influenced the abundance of species during the rainy and dry seasons, with the following dominant species alternating: Paracalanus quasimodo Bowman, 1971 in the rainy season of 2003, Parvocalanus crassirostris Dahl, 1894 in the dry season of 2003 and Acartia lilljeborgii Giesbrecht, 1892 in the rainy and dry seasons of 2004. Non-parametric multidimensional scaling indicated differences in copepod assemblages between sampling periods, but not between sampling stations.

  16. Potentials and limitations of adaptive plasticity in filtering screen morphology of Daphnia (Crustacea: Cladocera)

    Czech Academy of Sciences Publication Activity Database

    Macháček, Jiří; Seďa, Jaromír

    2016-01-01

    Roč. 38, č. 5 (2016), s. 1269-1280 ISSN 0142-7873 R&D Projects: GA ČR(CZ) GA206/09/1325; GA ČR(CZ) GA15-24309S Institutional support: RVO:60077344 Keywords : Daphnia * filtering screen morphology * transgenerational plasticity * ontogenetic plasticity * taxonspecific trait Subject RIV: EH - Ecology, Behaviour Impact factor: 1.983, year: 2016

  17. Formation of the hindgut cuticular lining during embryonic development of Porcellio scaber (Crustacea, Isopoda

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    Polona Mrak

    2015-07-01

    Full Text Available The hindgut and foregut in terrestrial isopod crustaceans are ectodermal parts of the digestive system and are lined by cuticle, an apical extracellular matrix secreted by epithelial cells. Morphogenesis of the digestive system was reported in previous studies, but differentiation of the gut cuticle was not followed in detail. This study is focused on ultrastructural analyses of hindgut apical matrices and cuticle in selected intramarsupial developmental stages of the terrestrial isopod Porcellio scaber in comparison to adult animals to obtain data on the hindgut cuticular lining differentiation. Our results show that in late embryos of stages 16 and 18 the apical matrix in the hindgut consists of loose material overlaid by a thin intensely ruffled electron dense lamina facing the lumen. The ultrastructural resemblance to the embryonic epidermal matrices described in several arthropods suggests a common principle in chitinous matrix differentiation. The hindgut matrix in the prehatching embryo of stage 19 shows characteristics of the hindgut cuticle, specifically alignment to the apical epithelial surface and a prominent electron dense layer of epicuticle. In the preceding embryonic stage – stage 18 – an electron dense lamina, closely apposed to the apical cell membrane, is evident and is considered as the first epicuticle formation. In marsupial mancae the advanced features of the hindgut cuticle and epithelium are evident: a more prominent epicuticular layer, formation of cuticular spines and an extensive apical labyrinth. In comparison to the hindgut cuticle of adults, the hindgut cuticle of marsupial manca and in particular the electron dense epicuticular layer are much thinner and the difference between cuticle architecture in the anterior chamber and in the papillate region is not yet distinguishable. Differences from the hindgut cuticle in adults imply not fully developed structure and function of the hindgut cuticle in marsupial manca, possibly related also to different environments, as mancae develop in marsupial fluid. Bacteria, evenly distributed within the homogenous electron dense material in the hindgut lumen, were observed only in one specimen of early marsupial manca. The morphological features of gut cuticle renewal are evident in the late marsupial mancae, and are similar to those observed in the exoskeleton.

  18. Formation of the hindgut cuticular lining during embryonic development of Porcellio scaber (Crustacea, Isopoda)

    OpenAIRE

    Mrak,Polona; Bogataj,Urban; Štrus,Jasna; Žnidaršič,Nada

    2015-01-01

    Abstract The hindgut and foregut in terrestrial isopod crustaceans are ectodermal parts of the digestive system and are lined by cuticle, an apical extracellular matrix secreted by epithelial cells. Morphogenesis of the digestive system was reported in previous studies, but differentiation of the gut cuticle was not followed in detail. This study is focused on ultrastructural analyses of hindgut apical matrices and cuticle in selected intramarsupial developmental stages of the terrestrial iso...

  19. Formation of the hindgut cuticular lining during embryonic development of Porcellioscaber (Crustacea, Isopoda).

    Science.gov (United States)

    Mrak, Polona; Bogataj, Urban; Štrus, Jasna; Žnidaršič, Nada

    2015-01-01

    The hindgut and foregut in terrestrial isopod crustaceans are ectodermal parts of the digestive system and are lined by cuticle, an apical extracellular matrix secreted by epithelial cells. Morphogenesis of the digestive system was reported in previous studies, but differentiation of the gut cuticle was not followed in detail. This study is focused on ultrastructural analyses of hindgut apical matrices and cuticle in selected intramarsupial developmental stages of the terrestrial isopod Porcellioscaber in comparison to adult animals to obtain data on the hindgut cuticular lining differentiation. Our results show that in late embryos of stages 16 and 18 the apical matrix in the hindgut consists of loose material overlaid by a thin intensely ruffled electron dense lamina facing the lumen. The ultrastructural resemblance to the embryonic epidermal matrices described in several arthropods suggests a common principle in chitinous matrix differentiation. The hindgut matrix in the prehatching embryo of stage 19 shows characteristics of the hindgut cuticle, specifically alignment to the apical epithelial surface and a prominent electron dense layer of epicuticle. In the preceding embryonic stage - stage 18 - an electron dense lamina, closely apposed to the apical cell membrane, is evident and is considered as the first epicuticle formation. In marsupial mancae the advanced features of the hindgut cuticle and epithelium are evident: a more prominent epicuticular layer, formation of cuticular spines and an extensive apical labyrinth. In comparison to the hindgut cuticle of adults, the hindgut cuticle of marsupial manca and in particular the electron dense epicuticular layer are much thinner and the difference between cuticle architecture in the anterior chamber and in the papillate region is not yet distinguishable. Differences from the hindgut cuticle in adults imply not fully developed structure and function of the hindgut cuticle in marsupial manca, possibly related also to different environments, as mancae develop in marsupial fluid. Bacteria, evenly distributed within the homogenous electron dense material in the hindgut lumen, were observed only in one specimen of early marsupial manca. The morphological features of gut cuticle renewal are evident in the late marsupial mancae, and are similar to those observed in the exoskeleton.

  20. On a new genus and species of Hemicytheridae (Ostracoda, Crustacea from the southern Brazilian coast

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    Anderson L. M. de Morais

    2014-09-01

    Full Text Available This study is based on 62 samples of phytal and bottom sediments collected along rocky beaches (< 3 m water depth of the central and northern coasts of the state of Santa Catarina (26º10'/27º50'S – 48º26'/48º40'W, southern Brazil. Living and dead ostracodes distributed among 16 families were recovered. In this paper is emphasized one new hemicytherid genus and species that is described and richly illustrated: Auricythere sublitoralis gen. nov. and sp. nov. Some ecological and zoogeographical aspects of this new ostracode are briefly discussed.

  1. ASPECTOS MORFO-HISTOQUÍMICOS DO VASO DEFERENTE DE Callichirus major (CRUSTACEA: AXIIDEA

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    Tugstênio Lima Souza

    2017-01-01

    Full Text Available Callichirus major é um decápode encontrado na região entre-marés de ambientes costeiros, em especial praias com areia de baixa granulometria. Esta espécie tem sido amplamente explorada para ser usada como isca viva para pesca. Devido à inexistência de informação microscópica acerca de seu aparelho reprodutor, o presente estudo teve como objetivo caracterizar o vaso deferente como forma de contribuir para o entendimento de sua reprodução. Os animais, coletados ao longo da Praia do Corujão, em Piúma/ES, e, em laboratório, tiveram seus vasos deferentes dissecados para o processamento histológico de rotina. O vaso deferente foi caracterizado em três regiões: proximal (VDP, de epitélio cilíndrico com função secretora; média (VDM e distal (VDD, com epitélio variando de pavimentoso a cúbico. No lúmen destas estruturas foi verificada a presença de matriz espermatofórica entre os espermatozoides, sendo esta intensamente reativa para os testes histoquímicos. Sendo assim, com base nas características observadas, foi possível compreender o papel funcional deste órgão na formação do conteúdo espermático desta espécie.

  2. A new species of Cavernocypris Hartmann, 1964 (Crustacea: Ostracoda) from caves in South Korea.

    Science.gov (United States)

    Smith, Robin James; Kamiya, Takahiro; Choi, Yong-Gun; Lee, Jimin; Chang, Cheon Young

    2017-05-17

    Surveys of caves in South Korea yielded a new species of the ostracod genus Cavernocypris Hartmann, 1964, herein described as Cavernocypris danielopoli Smith & Kamiya n. sp. This is the fifth described species in this widely distributed genus, and can be discriminated from its congeners by the highly triangular shape of the carapace in lateral view, caused by a large dorsal protrusion on the left valve. A second triangular-shaped morphotype was also collected, differing from the first by a lower carapace and less pronounced dorsal protrusion. As it is not clear at present if this represents a separate species or intraspecific variation, it is left in open nomenclature. The lack of a pigmented eye, a highly triangular carapace and no carapace pigmentation suggests that Cavernocypris danielopoli Smith & Kamiya n. sp. is the most adapted species in the genus to a stygobiotic lifestyle. Another Korean species, Cavernocypris coreana (McKenzie, 1972), found in caves and spring discharges, has a reduced number of antennule segments, common for stygobiotic species, but this feature is lacking in the new species. This suggests that within the genus, species have followed different evolutionary pathways to adapt to the subterranean realm.

  3. De pissebedden (Crustacea Isopoda, Oniscoidea) van de ondergrondse kalksteengroeven in Zuid-Limburg

    NARCIS (Netherlands)

    Holthuis, L.B.

    1983-01-01

    In the limestone quarries in the southern part of the province of Limburg, Netherlands, 13 species of Isopoda Oniscoidea were found during an intensive exploration (1946-1958) of the obscuricole fauna of these artificial caves. None of the species found is troglobiont, all have to be classed as

  4. Behavioural responses of Gammarus pulex (Crustacea, Amphipoda) to low concentrations of pharmaceuticals

    NARCIS (Netherlands)

    Lange, de H.J.; Noordoven, W.; Murk, A.J.; Lürling, M.F.L.L.W.; Peeters, E.T.H.M.

    2006-01-01

    The continuous discharge of pharmaceuticals and personal care products into the environment results in a chronic exposure of aquatic organisms to these substances and their metabolites. As concentrations in surface waters are in the ng/L range, and sometimes in the low microg/L range, they are not

  5. TAMANHO POPULACIONAL DE XIPHOPENAEUS KROYERI HELLER, 1862 (CRUSTACEA, PENAEOIDEA NO LITORAL DE ANCHIETA/ES

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    Keltony Aquino Ferreira

    2017-01-01

    Full Text Available O camarão sete-barbas (Xiphopenaeus kroyeri pertence à família Penaeidae, distribuído desde os Estados Unidos ao sul do Brasil, ocorrendo em profundidades de até 25 metros. Destaca-se por apresentar uma significativa importância econômica, e sua pesca é o segundo maior recurso pesqueiro das regiões Sudeste-sul do Brasil. O presente estudo visa caracterizar o tamanho populacional, razão sexual e o recrutamento de jovens do camarão sete-barbas localizado na região de Anchieta, litoral sul do Espírito Santo. Os exemplares foram coletados de março/13 a fevereiro/15. Foram capturados 6.117 indivíduos, sendo 803 jovens, 2.280 machos e 3.034 fêmeas. O comprimento de carapaça variou de 5 a 28 mm, sendo que as fêmeas atingiram tamanhos maiores. A razão sexual diferiu estatisticamente para fêmeas. Com os resultados do presente estudo foi possível constatar que X. kroyeri completa seu ciclo de vida no local de estudo, baseado na presença de jovens e adultos coletados em todo período.

  6. Intersexuality in the porcellanid crab Pisidia longicornis (Crustacea: Decapoda: Anomura: Porcellanidae

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    Luciane Augusto de Azevedo Ferreira

    2015-04-01

    Full Text Available Intersex specimens of Pisidia longicornis (Linnaeus, 1767 are recorded for the first time and their secondary sexual characters are analyzed. Of 145 specimens of P. longicornis examined in this study, six were identified as intersex individuals. Of these, three presented male secondary sexual characters, well-developed male gonopores and rudimentary female gonopores, whereas the other three had female secondary sexual characters, with female gonopores being more pronounced than the male ones. The present study provides the first record of intersex porcelain crabs.

  7. Desenvolvimento juvenil de Hepatus pudibundus (Herbst (Crustacea, Decapoda, Calappidae, em laboratório

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    Hebling Nilton José

    2003-01-01

    Full Text Available The Hepatus pudibundus (Herbst, 1785 juvenile development was studied in laboratory, under the morphological and systematical stand points. The eight early juvenile stages were obtained from larvae hatched from eggs of two ovigerous females, collected at the northern coast of the State of São Paulo, Brazil. The experiments were carried out in a climatically controlled room at 25 ± 1°C, and steady saltness of 34?. The youngs were maintened individually and food consisted of Artemia sp. nauplii and fragments of fish muscle.The first juvenile stage were particulary drawn and described. For the remaining juvenile stages the most representative frameworks were picked out, which allowed the characterization of the first eight stages. According to juvenile morphology studies, it was noted that secondary sexual characters differentation begins from the third stage.

  8. DNA barcoding of twelve shrimp species (Crustacea: Decapoda from Turkish seas reveals cryptic diversity

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    R. BILGIN

    2014-05-01

    Full Text Available DNA barcoding is a useful tool for the identification and potential discovery of new species. In this study, DNA barcoding was employed by sequencing the mitochondrial cytochrome oxidase subunit I gene (COI to characterize the genetic diversity of 12 shrimp species inhabiting Turkish coastal waters and, when possible, to compare with the genetic data available from different parts of the Mediterranean and eastern Atlantic. This study also comprises the first DNA barcoding study performed in the Turkish Seas using COI. A total of 40 shrimp specimens were collected and analyzed from 9 sites. Generally, the barcoding gap criterion was successful at identifying species; hence COI appeared to be a good marker of choice for DNA barcoding in this group. Out of the 12 species investigated, five were barcoded for the first time. In six species two intraspecific clades were retrieved after the analyses. The results suggest the presence of cryptic diversity in a genetically understudied marine area, Turkish coastal waters, and further investigation in these species using population genetics, taxonomic approaches and nuclear markers is likely to result in designation of new species.

  9. Caridean shrimps (Crustacea, Decapoda) from seagrass habitats in Hansa Bay, Papua New Guinea

    NARCIS (Netherlands)

    Grave, de Sammy

    1999-01-01

    Five species of caridean shrimps collected from seagrass habitats at Hansa Bay, on the northern coastline of Papua New Guinea are reported. Four species are new to the fauna of Papua New Guinea. Morphological details of Nikoides danae, Latreutes pymoeus and L. porcinus are discussed and compared to

  10. Linking eye design with host symbiont relationships in pontoniine shrimps (Crustacea, Decapoda, Palaemonidae.

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    Nicola C Dobson

    Full Text Available Symbiosis is prevalent in the marine environment with many studies examining the effects of such interactions between host and symbiont. Pontoniine shrimps are a group whose ecology is characterised by symbiotic interactions. This investigation examines the gross morphology of Pontoniinae compound eyes and superficial optical parameters with reference to their symbiotic relationship or lifestyle category; free-living, ectosymbiont, endosymbiont (bivalves or endosymbiont (non-bivalves. The eye morphologies of free-living and ectosymbiotic species are very similar, yet differ from both forms of endosymbiotic species. Endosymbionts have significantly smaller and simpler eyes with larger facets and bigger interommatidial angles and eye parameters for increased sensitivity levels. However bivalve endosymbionts form an intermediary group between non-bivalve endosymbionts and ectosymbionts as a result of their more active lifestyle. The accessory eye or "nebenauge", although of uncertain function, commonly occurs in free-living Pontoniinae species but rarely in endosymbionts apart from in more primitive species. The variation in morphology reflects tensions between functional requirements and ecological pressures that have strongly influenced eye design in Pontoniinae.

  11. Let’s be pals again: major systematic changes in Palaemonidae (Crustacea: Decapoda

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    Sammy De Grave

    2015-08-01

    Full Text Available In recent years the systematic position of genera in the shrimp families Gnathophyllidae and Hymenoceridae has been under debate, with phylogenetic studies suggesting the families are not real family level units. Here, we review the molecular evidence as well as the morphological characters used to distinguish both families, leading to the conclusion that neither family is valid. Further, we studied the structural details of the single morphological character which distinguishes the two subfamilies (Palaemoninae, Pontoniinae in Palaemonidae, as well as their phylogenetic relationship. As the supposed character distinction plainly does not hold true and supported by the phylogenetic results, the recognition of subfamilies in Palaemonidae is not warranted. As a consequence, all three supra-generic taxa (Gnathophyllidae, Hymenoceridae, Pontoniinae are thus herein formally synonymised with Palaemonidae.

  12. Diversity and distribution of freshwater amphipod species in Switzerland (Crustacea: Amphipoda.

    Directory of Open Access Journals (Sweden)

    Florian Altermatt

    Full Text Available Amphipods are key organisms in many freshwater systems and contribute substantially to the diversity and functioning of macroinvertebrate communities. Furthermore, they are commonly used as bioindicators and for ecotoxicological tests. For many areas, however, diversity and distribution of amphipods is inadequately known, which limits their use in ecological and ecotoxicological studies and handicaps conservation initiatives. We studied the diversity and distribution of amphipods in Switzerland (Central Europe, covering four major drainage basins, an altitudinal gradient of>2,500 m, and various habitats (rivers, streams, lakes and groundwater. We provide the first provisional checklist and detailed information on the distribution and diversity of all amphipod species from Switzerland. In total, we found 29 amphipod species. This includes 16 native and 13 non-native species, one of the latter (Orchestia cavimana reported here for the first time for Switzerland. The diversity is compared to neighboring countries. We specifically discuss species of the genus Niphargus, which are often receiving less attention. We also found evidence of an even higher level of hidden diversity, and the potential occurrence of further cryptic species. This diversity reflects the biogeographic past of Switzerland, and suggests that amphipods are ideally suited to address questions on endemism and adaptive radiations, post-glaciation re-colonization and invasion dynamics as well as biodiversity-ecosystem functioning relationships in aquatic systems.

  13. Physiological and behavioural responses of Gammarus pulex (Crustacea: Amphipoda) exposed to cadmium

    Energy Technology Data Exchange (ETDEWEB)

    Felten, V. [Laboratoire d' Ecotoxicologie, CEMAGREF, 3 bis quai Chauveau, CP 220, 69336 Lyon Cedex 09 (France)], E-mail: vincent.felten@univ-reims.fr; Charmantier, G. [Equipe Adaptation Ecophysiologique et Ontogenese, UMR 5119 Ecolag, Universite Montpellier II, Place E. Bataillon, 34095 Montpellier Cedex 05 (France); Mons, R. [Laboratoire d' Ecotoxicologie, CEMAGREF, 3 bis quai Chauveau, CP 220, 69336 Lyon Cedex 09 (France); Geffard, A. [Laboratoire d' Eco-toxicologie, Universite de Reims Champagne Ardenne, Faculte des Sciences, Moulin de la Housse, BP 1039, 51687 Reims Cedex 2 (France); Rousselle, P. [Laboratoire Biodiversite et Fonctionnement des Ecosystemes, Universite de Metz, Campus Bridoux, Rue du General Delestraint, 57 070 Metz (France); Coquery, M. [Laboratoire de Chimie Environnementale, CEMAGREF, 3 bis quai Chauveau, CP 220, 69336 Lyon Cedex 09 (France); Garric, J.; Geffard, O. [Laboratoire d' Ecotoxicologie, CEMAGREF, 3 bis quai Chauveau, CP 220, 69336 Lyon Cedex 09 (France)

    2008-02-18

    The aim of this study was to investigate the effects of cadmium on physiological and behavioural responses in Gammarus pulex. In a first experiment, cadmium LC50s for different times were evaluated in 264 h experiment under continuous mode of exposure (LC50{sub 96h} = 82.1 {mu}g L{sup -1}, LC50{sub 120h} = 37.1 {mu}g L{sup -1}, LC50{sub 168h} = 21.6 {mu}g L{sup -1}, LC50{sub 264h} = 10.5 {mu}g L{sup -1}). In a second experiment, the physiological and behavioural responses of the amphipod exposed to cadmium (0, 7.5 and 15 {mu}g L{sup -1}) were investigated under laboratory conditions. The mortality and the whole body cadmium concentration of organisms exposed to cadmium were significantly higher than in controls. Concerning physiological responses, cadmium exposure exerted a significant decrease on osmolality and haemolymph Ca{sup 2+} concentration, but not on haemolymph Na{sup +} and Cl{sup -} concentrations, whereas the Na{sup +}/K{sup +}-ATPase activity was significantly increased. Behavioural responses, such as feeding rate, locomotor and ventilatory activities, were significantly reduced in Cd exposed organisms. Mechanism of cadmium action and consequent energetic reallocation in favour of maintenance functions (i.e., osmoregulation) are discussed. The results of this study indicate that osmolality and locomotor activity in G. pulex could be effective ecophysiological/behavioural markers to monitor freshwater ecosystem and to assess the health of organisms.

  14. Responses of Niphargus montellianus and Gammarus balcanicus (Crustacea, Amphipoda) from karst waters to heavy metal exposure

    Science.gov (United States)

    Coppellotti Krupa, O.; Guidolin, L.

    2003-05-01

    The response to some heavy metals (Cd, Cu, and Zn) was examined in two amphipods, Niphargus montellianus and Gammarus balcanicus, living in karst waters and endowed with different ecological characteristics. Exposure experiments were made, in the controlled conditions of a biospeleology laboratory, to increasing concentrations of metals in the range 0.1 10 μg ml^{-1} for up to 10 days. Hypogean and epigean amphipods differed in their responses, G. balcanicus being more sensitive to the toxic effects of heavy metals than the hypogean N montellianus. The degree of tolerance was Cu

  15. The toxicological effects of thiamethoxam on Gammarus kischineffensis (Schellenberg 1937) (Crustacea: Amphipoda).

    Science.gov (United States)

    Uğurlu, Pelin; Ünlü, Erhan; Satar, Elif İpek

    2015-03-01

    Neonicotinoids are a new group of insecticides, and little is known about their toxicity to nontarget freshwater organisms an potential effects on freshwater ecosystems. The aim of this study is to establish the acute toxicity and histopathological effects of thiamethoxam-based pesticide on the gill tissue of Gammarus kischineffensis. In this study G. kischineffensis samples were exposed to 2.5, 5, 7.5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90 and 100mg/l of commercial grade thiamethoxam for 96 h. The 24, 48, 72 and 96 h LC50 values were determined as 75.619, 23.505, 8.048 and 3.751 mg/l respectively. In histopathological study the individuals were exposed to 0.004, 0.04 and 0.4 mg/l thiamethoxam concentrations for 14 days. The results showed that the most common changes at all doses of thiamethoxam were vacuolization and hemostatic infiltration in the gill tissue of G. kischineffensis. Copyright © 2015 Elsevier B.V. All rights reserved.

  16. Silver nanoparticles impact the functional role of Gammarus roeseli (Crustacea Amphipoda).

    Science.gov (United States)

    Andreï, Jennifer; Pain-Devin, Sandrine; Felten, Vincent; Devin, Simon; Giambérini, Laure; Mehennaoui, Kahina; Cambier, Sebastien; Gutleb, Arno C; Guérold, François

    2016-01-01

    Silver nanoparticles (nAg) are widely used in consumer products and the risk associated with their potential release into freshwater ecosystems needs to be addressed using environmentally realistic exposure concentrations. Here, the effects of low concentrations (0.5-5 μg L(-1)) of two different sized nAg (10 and 60 nm) and a silver nitrate positive control were evaluated in Gammarus roeseli following exposure for 72 h. Cellular, individual and functional endpoints were independently studied and the most striking results were reported for functional endpoints. Indeed, without a change in their feeding activity, the gammarids produced significantly fewer fine particles of organic matter when exposed to nAg, even at 0.5 μg L(-1) of 10 nm nAg. These functional endpoints seem to be efficient markers for detecting the early effects of nAg on G. roeseli. Copyright © 2015 Elsevier Ltd. All rights reserved.

  17. Behavioural and physiological responses of Gammarus fossarum (Crustacea Amphipoda) exposed to silver.

    Science.gov (United States)

    Arce Funck, J; Danger, M; Gismondi, E; Cossu-Leguille, C; Guérold, F; Felten, V

    2013-10-15

    The study aims at investigating the effects of silver (Ag), a re-emerging contaminant, on physiological and behavioural responses in Gammarus fossarum. In a first experiment, G. fossarum Ag LC50s were evaluated during 96 h under semi-static mode of exposure. Juveniles appeared to be more sensitive to Ag (LC5096h: 1.01 μg L(-1)) than ovigerous females (LC5096h: 1.9 μg L(-1)) and adult males (LC5096h: 2.2 μg L(-1)). In a second experiment, the physiological (osmo-/ionoregulation; antioxidant enzymes; lipid peroxidation (LPO)) and behavioural (locomotor activity and ventilation) responses of male G. fossarum exposed to Ag (0, 0.5, 1, 2, and 4 μg L(-1)) were investigated. The mortality and Ag bioconcentration of gammarids exposed to Ag were significantly higher than controls. Concerning physiological responses, a 48 h-exposure to Ag had no impact on catalase activity but led to a significant decrease of haemolymph osmolality and [Na(+)]. On the contrary, LPO, Se-GPx and Na(+)/K(+)-ATPase activity were significantly increased. Behavioural responses, such as locomotor and ventilatory activities, were also significantly reduced in Ag exposed gammarids. After 96 h-exposure, especially to 0.5 μg Ag L(-1), most responses (ventilation, locomotor activity, haemolymph osmolality and [Na(+)]) were even more pronounced and haemolymph [Cl(-)] was significantly decreased but, contrary to observations after 48 h-exposure, Na(+)/K(+)-ATPase activity was significantly reduced. Our results demonstrate the drastic effects of realistic [Ag] concentration (0.5 μg Ag L(-1)) on an ubiquitous and functionally important freshwater invertebrate (implied in detritus breakdown), but also strongly suggest an energetic reallocation to the detriment of locomotor activity and in favour of maintenance functions (i.e., osmoregulation and detoxification). These results highlight the risk represented by Ag and the need to perform integrated studies (at different scales, from individual to ecosystem). Copyright © 2013 Elsevier B.V. All rights reserved.

  18. On two new freshwater species of the genus Gammarus from North Africa (Crustacea, Amphipoda)

    NARCIS (Netherlands)

    Pinkster, Sjouk; Goedmakers, Annemarie

    1975-01-01

    Two new gammarid species from Morocco are described. The first new species, Gammarus rouxi nov. spec. is characterized by a very typical seventh leg and was found together with Gammarus gauthieri Karaman, 1931 in a well; the second species Gammarus microps nov. spec. is characterized by very small

  19. COMPARISON OF STRESS PROTEINS PARTICIPATION IN ADAPTATION MECHANISMS OF BAIKALIAN AND PALEARCTIC AMPHIPOD (AMPHIPODA; CRUSTACEA SPECIES

    Directory of Open Access Journals (Sweden)

    Timofeyev M.A

    2006-03-01

    Full Text Available The aim of the present study was a study of the influence different stressful factor on syntheses and activity of the stress proteins (HSP70, sHSP and peroxidase of freshwater organism. Six freshwater amphipod species were investigated: Eulimnogammarus cyaneus (Dyb., E verrucosus (Gerstf., E vittatus (Dyb. - endemic species from Lake Baikal which were compared with Palearctic species - Gammarus lacustris Sars., G tigrinus (Sexton, Chaetogammarus ischnus (Stebbins. It was shown expression of sHSP by heat and toxic stresses for all amphipods species. Oxidative stress induced HSP70 for Palearctic species G tigrinus and C ischnus but not for baikalian species. Heat stress did not caused the increase of HSP70 level for Baikalian species of amphipods. The activity of the peroxidase was decrease by heat and toxic stresses. Oxidative stress caused the increase of peroxidase activity for Palearctic species, and the decrease for Baikalian once.

  20. Parasitic manipulation and neuroinflammation: Evidence from the system Microphallus papillorobustus (Trematoda - Gammarus (Crustacea

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    Thomas Frederic

    2010-04-01

    Full Text Available Abstract Background Neuropathological consequences of neuroinflammatory processes have been implicated in a wide range of diseases affecting the central nervous system (CNS. Glial cells, the resident immune cells of the CNS, respond to tissue injury by releasing proinflammatory cytokines and free radicals such as nitric oxide. We explored the possibility that neuroimmune responses are involved in parasitic manipulation of host behavior in a trematode-crustacean association. The cerebral larva of the flatworm Microphallus papillorobustus alters responses to environmental stimuli - and thus reflex pathways - in the crustacean Gammarus insensibilis, in a way that enhances predation of the crustacean by birds, definitive hosts of the parasite. Results Immunocytochemical experiments followed by confocal microscopy were performed to study the distribution of glutamine synthetase, a glial cell marker, and nitric oxide synthase in the brain of gammarids. Astrocyte-like glia and their processes were abundant at the surface of the parasites while levels of nitric oxide synthase were elevated at the host-parasite interface in the brain of gammarids harboring mature cerebral larvae and demonstrating altered behavior. Conclusion Taken together these results lend support to the neuroinflammation hypothesis whereby a chronic CNS specific immune response induced by the parasite plays a role in the disruption of neuromodulation, neuronal integrity, and behavior in infected hosts.

  1. Sur la presence du genre Gammarus au Liban, avec description de deux nouveaux taxa (Crustacea, Amphipoda)

    NARCIS (Netherlands)

    Alouf, N.J.

    1979-01-01

    Description of two new taxa, Gammarus oronticus n.sp. and G. laticoxalis libanicus n.ssp., both related to the Gammarus pulex-group, from the Lebanon. Data about their ecology and new data on G. syriacus Chevreux are given.

  2. Two new Gammarus species and a new name (Crustacea: Amphipoda: Gammaridae) from Northwest China.

    Science.gov (United States)

    Zhao, Shuangyan; Meng, Kaibaryer; Hou, Zhonge

    2017-06-02

    Two new species of the genus Gammarus are described and illustrated from Northwest China. A new species name Gammarus tianshan nom. nov. is proposed to replace G. montanus Hou et al., 2004. Gammarus simplex sp. nov. from Altay, Xinjiang, is characterized by uropod III with simple setae on both rami and urosomite I only with setae on dorsal margin. Gammarus glaber sp. nov. from Qinghai, is characterized by uropod III with few simple and plumose setae. Detailed morphological description and differences from related species are discussed. A distribution map of the new species and related species is provided.

  3. Bathymetric expansion of an invasive gammarid (Dikerogammarus villosus, Crustacea, Amphipoda in Lake Léman

    Directory of Open Access Journals (Sweden)

    Olivier REYMOND

    2006-08-01

    Full Text Available After the arrival of Dikerogammarus villosus SOVINSKIJ in Lake Léman (2002 and its rapid expansion, the bathymetric distribution of gammarids was investigated in 2004-2005 at one location in the lake. D. villosus is able to colonize a wide range of substratum types (cobbles, gravel, sand/clay with Dreissena aggregates down to a depth of 10 meters. Maximum abundance reached 235 ind. m-2 in November 2004 between 0.5 and 1 m. The native gammarids (Gammarus pulex (LINNAEUS and G. fossarum (KOCH were found in low numbers almost exclusively at a depth of 10 meters. The replacement of G. pulex and G. fossarum by D. villosus is confirmed as no more native species have been found since 2004 between 0 and 5 meters in sites where they were previously abundant. Even though the decline of invertebrate richness was not observed in the littoral zone, our results suggest that the native species are threatened.

  4. Individual variation in the seasonal reproduction of the terrestrial isopod Armadillidium vulgare Latr. (Crustacea, Oniscidea)

    Science.gov (United States)

    Souty-Grosset, Catherine; Nasri, Karima; Mocquard, Jean-Pierre; Juchault, Pierre

    1998-08-01

    Under particular conditions of photoperiod and temperature, Armadillidium vulgare females, originating from a single population, might exhibit individual differences in the onset of reproduction and duration of the breeding period. In a population issued from a strain from middle latitudes, some females underwent only one parturial moult (northern tendency) and others three parturial moults (southern tendency). Females with an atypical northern phenology are the most numerous and tend to be found near the Danish population. In the latter, there is an asymmetrical response to laboratory selection (favourable to females with a longer breeding period). The asymmetrical variation in atypical individuals acts as a safety device against the unpredictability of the environment. The adaptation of this species, originally from the Mediterranean periphery, to a northern environment has led to a reduction in its capacity to breed over long periods of time. Populations from middle latitudes can undergo one or several parturial moults which enables the species to successfully colonize even far-away countries. These intrapopulation differences have an essential role and explain why Armadillidium vulgare is one of the most widely distributed species among Oniscidea.

  5. Effects of terrestrial isopods (Crustacea: Oniscidea on leaf litter decomposition processes

    Directory of Open Access Journals (Sweden)

    Khaleid F. Abd El-Wakeil

    2015-03-01

    Full Text Available The leaf litter decomposition is carried out by the combined action of microorganisms and decomposer invertebrates such as earthworms, diplopods and isopods. The present work aimed to evaluate the impact of terrestrial isopod on leaf litter decomposition process. In Lab experimental food sources from oak and magnolia leaves litter were prepared. Air dried leaf litter were cut to 9 mm discs and sterilized in an autoclave then soaked in distilled water or water percolated through soil and left to decompose for 2, 4 and 6 weeks. 12 groups from two isopods species Porcellio scaber and Armadillidium vulgare, were prepared with each one containing 9 isopods. They were fed individually on the prepared food for 2 weeks. The prepared food differed in Carbon stable isotope ratio (δ13C, C%, N% and C/N ratios. At the end of the experiment, isopods were dissected and separated into gut, gut content and rest of the body. The δ13C for the prepared food, faecal pellets, remaining food, gut content, gut and rest of isopod were compared. The feeding activities of the two isopods were significantly different among isopods groups. Consumption and egestion ratios of magnolia leaf were higher than oak leaf. P. scaber consumed and egested litter higher than A. vulgare. The present results suggested that the impact of isopods and decomposition processes is species and litter specific.

  6. Origin and occurrence of sexual and mating systems in Crustacea: A ...

    Indian Academy of Sciences (India)

    2013-11-06

    Nov 6, 2013 ... Understandably, ecological influences may also play a determinative role in the evolution of such sexual and mating ..... Depending on the biology and ecology of a particular species males might have the reproductive .... only one gynandromorphic form of the spider crab, Hyas coarctatus, out of 2500 ...

  7. Red Sea Leucothoidae (Crustacea: Amphipoda) including new and re-described species

    KAUST Repository

    White, Kristine N.

    2017-05-31

    Examination of leucothoid amphipods of the Red Sea has revealed seven species not previously reported from this location. Leucothoe minoculis sp. nov., Leucothoe pansa sp. nov., Leucothoe reimeri sp. nov., and Paranamixis sommelieri sp. nov. are described and the range of Leucothoe predenticulata Ledoyer, 1978, L. acutilobata Ledoyer, 1978 and L. squalidens Ledoyer, 1978 is expanded to include the Red Sea. Clarification of reports of L. acanthopus Schellenberg, 1928 and L. bannwarthi (Schellenberg, 1928) is provided and Leucothoe alani sp. nov. is described from outside the Red Sea.

  8. First record of the Asian diaptomid Neodiaptomus schmackeri (Poppe & Richard, 1892 (Crustacea: Copepoda: Calanoida in Europe

    Directory of Open Access Journals (Sweden)

    Giuseppe Alfonso

    2014-06-01

    Full Text Available Albania, as well as a great part of the Balkan area in general, still suffers a lack of environmental studies especially in limnological research. The Dumre plateau, in Central Albania, is characterized by an extraordinary high number of karst lakes in a small geographic area. Despite their environmental peculiarity, very few biological data are to date available for these lakes, none on the zooplankton. For this reason, 15 water bodies located in the central area of the plateau were selected for a preliminary limnological survey carried out in the years 2008-2011. Neodiaptomus schmackeri (Poppe & Richard, 1892, a diaptomid calanoid copepod characterized by a South-Eastern Palearctic - Oriental distribution, and the most widely spread Neodiaptomus species in Asia, was found in 8 lakes of the Dumre area. This finding represents the first record of the species, and of the entire genus Neodiaptomus, for Europe. Several environmental variables were measured to characterize the lakes, and the co-occurring planktonic crustaceans were also identified. Taxonomical drawings and descriptions of the main morphological features of both sexes are herein provided in order to compare the Albanian populations of N. schmackeri with those of the native distribution area of the species. The possible causes which determined the occurrence of this non-indigenous species in several Dumre lakes are discussed.

  9. GENETIC COMPARISONS OF GERMAN POPULATIONS OF THE STONE CRAYFISH, AUSTROPOTAMOBIUS TORRENTIUM (CRUSTACEA: ASTACIDAE

    Directory of Open Access Journals (Sweden)

    SCHUBART C. D.

    2006-01-01

    Full Text Available Austropotamobius torrentium (SCHRANK, 1803 is the smallest of the European native crayfish species and has probably never been of economic interest. It is confined to headwaters and adapted to cold water with high flow through and rocky environments. These properties make the stone crayfish a useful species for population genetics and phylogeographic studies. Representatives were collected from 18 localities throughout southern Germany and analysed with two mitochondrial genetic markers. Initial results revealed that German populations of A. torrentium from the Danube and Rhine tributaries share identical haplotypes in 528 basepairs of 16S rRNA and 658 basepairs of the COI gene. Rare haplotypes of the COI genes were occasionally encountered and apparently restricted to southwestern Bavaria. Only three variable sites were found over a length of 658 basepairs in 45 German, Swiss and Austrian stone crayfish resulting in five different haplotypes, with the prevalence of one most common haplotype. Here we show that in German populations rare haplotypes are not randomly distributed, but found in higher frequencies in the Bavarian Alps of the Allgäu and in adjacent Tyrol. On the other hand, stone crayfish population from the Bavarian Forest and the Rhine tributaries appear genetically impoverished, so far only showing the most common haplotype. Consequently, there are significant differences between the Allgäu populations and the rest of the German populations in haplotype frequencies, resulting in a relatively high FST value. This finding is of importance for future conservation efforts of stone crayfish populations in Germany and Austria.

  10. Karyotype Variability and Inter-Population Genomic Differences in Freshwater Ostracods (Crustacea Showing Geographical Parthenogenesis

    Directory of Open Access Journals (Sweden)

    Radka Symonová

    2018-03-01

    Full Text Available Transitions from sexual to asexual reproduction are often associated with polyploidy and increased chromosomal plasticity in asexuals. We investigated chromosomes in the freshwater ostracod species Eucypris virens (Jurine, 1820, where sexual, asexual and mixed populations can be found. Our initial karyotyping of multiple populations from Europe and North Africa, both sexual and asexual, revealed a striking variability in chromosome numbers. This would suggest that chromosomal changes are likely to be accelerated in asexuals because the constraints of meiosis are removed. Hence, we employed comparative genomic hybridization (CGH within and among sexual and asexual populations to get insights into E. virens genome arrangements. CGH disclosed substantial genomic imbalances among the populations analyzed, and three patterns of genome arrangement between these populations: 1. Only putative ribosomal DNA (rDNA-bearing regions were conserved in the two populations compared indicating a high sequence divergence between these populations. This pattern is comparable with our findings at the interspecies level of comparison; 2. Chromosomal regions were shared by both populations to a varying extent with a distinct copy number variation in pericentromeric and presumable rDNA-bearing regions. This indicates a different rate of evolution in repetitive sequences; 3. A mosaic pattern of distribution of genomic material that can be explained as non-reciprocal genetic introgression and evidence of a hybrid origin of these individuals. We show an overall increased chromosomal dynamics in E. virens that is complementary with available phylogenetic and population genetic data reporting highly differentiated diploid sexual and asexual lineages with a wide variety of genetic backgrounds.

  11. Cypris morphology in the barnacles Ibla and Paralepas (Crustacea: Cirripedia Thoracica) implications for cirripede evolution

    DEFF Research Database (Denmark)

    Høeg, Jens T; Achituv, Yair; Chan, Benny K K

    2009-01-01

    We used scanning electron microscopy (SEM) to describe cypris morphology in species of the barnacles Ibla and Paralepas, both of which are pivotal in understanding cirripede evolution. In Ibla, we also studied late naupliar stages with video and SEM. Special emphasis was put on the lattice organs...

  12. Growth and molting in epizoic pedunculate barnacles genus Octolasmis (Crustacea: Thecostraca: Cirripedia: Thoracica)

    DEFF Research Database (Denmark)

    Blomsterberg, Mikkel; Glenner, Henrik; Høeg, Jens T

    2004-01-01

    Scanning electron microscopy, light microscopy, and histology were used to study growth in species of the pedunculate barnacle genus Octolasmis (O. angulata, O. cor, O. californiana, O. mülleri). These species are epizoic in the gill chamber of portunid crabs and have highly reduced capitular she...

  13. PREVALENCE OF BARNACLES (CRUSTACEA; CIRRIPEDIA) AND ITS POSSIBLE RELATION TO FIBROPAPYLLOMATOSIS IN CHELONIA MYDAS

    OpenAIRE

    R. R. Zamana; A. B. Moreira; L. I. Ferreira

    2017-01-01

    A fibropapilomatose é uma afecção tumoral, caracterizada pela presença de tumores cutâneos que variam em tamanho entre 0.1 a mais de 30 cm de diâmetro. É considerada uma afecção debilitante e potencialmente fatal para as tartarugas marinhas, afetando principalmente a espécie Chelonia mydas, mas também é uma doença que tem sido registrada em outras espécies. Evidências levam a crer que a etiologia da fibropapilomatose é viral e está associada a áreas costeiras poluídas que apresentam alta dens...

  14. Effect of environmental stress on clonal structure of Eucypris virens (Crustacea, Ostracoda)

    OpenAIRE

    Martins M. J. F.; Vandekerkhove J.; Adolfsson S.; Rossetti G.; Namiotko T.; Jokela J.

    2010-01-01

    Environmental stress imposes strong natural selection on clonal populations, promoting evolutionary change in clonal structure. Environmental stress may also lead to reduction in population size, which together with clonal selection may reduce genotypic diversity of the local populations. We examined how clonal structure in wild-collected samples of two parthenogenetic populations of the freshwater ostracod Eucypris virens responded to hypersalinity and starvation, and the combination of the ...

  15. A new species of Gastrosaccus (Crustacea: Mysidacea) from the South West Coast of Australia

    Digital Repository Service at National Institute of Oceanography (India)

    Panampunnayil, S.U.

    A description of a new mysid Gastrosaccus robusta, is given. This species is distinguished from related species by possessing lobes on the carapace, a strong chitinous projection on the fifth abdominal segment, characters of the male pleopods...

  16. Sperm ultrastructure of shrimps from the family Penaeidae (Crustacea: Dendrobranchiata) in a phylogenetic context.

    Science.gov (United States)

    Camargo, Tavani Rocha; Rossi, Natalia; Castilho, Antonio L; Costa, Rogério C; Mantelatto, Fernando L; Zara, Fernando José

    2017-07-01

    We describe the sperm ultrastructure of six penaeid species, including at least one member of each tribe (Penaeini, Parapenaeini and Trachypenaeini). Fragments of the vas deferens of the Penaeidae Farfantepenaeus brasiliensis, Farfantepenaeus paulensis, Litopenaeus schmitti, Parapenaeus americanus, Rimapenaeus constrictus and Xiphopenaeus kroyeri were fixed and processed according to the routine for transmission electron microscopy. The morphological results were contextualized in an evolutionary perspective using molecular markers for the phylogenetic reconstruction of this group. A phylogram was proposed by Bayesian inference based on 1007 bp of 33 sequences of the combined genes (16S rDNA and COI mtDNA) from 27 dendrobranchiate specimens. Our findings show that morphological differences in the sperm ultrastructures of members among the tribes of Penaeidae can be used as a baseline to understand their evolutionary relationships. Individuals from the Penaeini tribe show plesiomorphic characteristics in the sperm ultrastructure compared to the Trachypenaeini tribe from which they were derived, such as shrimp from family Sicyoniidae. The morphological complexity of the sperm of the different penaeid members corroborated with the genetic phylogeny, which showed different clades for each tribe and the close relationship with Sicyoniidae. The sperm features of the selected species studied here reflected their evolutionary history. These features confirm the previous phylogenetic hypothesis and question the monophyly of Penaeidae, which should be verified in the future with a more complete set of representative members of each tribe. Copyright © 2017 Elsevier Ltd. All rights reserved.

  17. In vivo and in vitro protein digestibility of formulated feeds for Artemesia longinaris (Crustacea, Penaeidae

    Directory of Open Access Journals (Sweden)

    Analía Verónica Fernández Gimenez

    2009-12-01

    Full Text Available This study was undertaken to determine the in vivo crude protein apparent digestibility in the prawn Artemesia longinaris, using feeds with 0.25% of chromic oxide and animal (fish meal, meat and bone meal and squid protein concentrate and plant (soybean meal ingredients. Three replicate groups of prawn were fed and the feces were collected. The rate of protein hydrolysis was measured in vitro using midgut gland enzyme extract from the prawns fed the respective feeds and was compared with those found with enzyme extract of wild prawn. The in vivo apparent digestibility coefficients showed significant differences among the feeds (PO objetivo do presente trabalho foi determinar a digestibilidade aparente in vivo da proteína bruta de ingredientes de origem animal (farinhas de peixe, osso e carne e concentrado de proteína de lula e ingredientes vegetais (farinha de soja em camarões Artemesia longinaris utilizando rações contendo 0,25% de óxido de cromo. Três grupos de camarões, utilizados como replicatas, foram alimentados e as fezes coletadas. A velocidade de hidrólise da proteína de cada ração foi medida in vitro utilizando extrato enzimático da glândula do intestino médio dos camarões alimentados com a ração correspondente e foi comparado com aqueles obtidos com o extrato enzimático de camarões selvagens. Os coeficientes de digestibilidade aparente in vivo mostraram diferenças significativas entre as rações testadas (P<0,05. A farinha de peixe apresentou a maior digestibilidade (92%, enquanto valores intermediários de digestibilidade (83% foram encontrados para a farinha de carne e ossos. A ração contendo farinha de soja e concentrado de proteína de lula resultou em menor digestibilidade (63%. Não houve diferença significativa entre os valores de digestibilidade in vitro para as rações testadas. Estes resultados indicam a limitação inerente dos ensaios enzimáticos in vitro, os quais poderiam ser complementados com estudos in vivo.

  18. Cyclopidae (Crustacea, Copepoda from the upper Paraná River floodplain, Brazil

    Directory of Open Access Journals (Sweden)

    LANSAC-TÔHA F. A.

    2002-01-01

    Full Text Available Cyclopid copepods from samples of fauna associated with aquatic macrophytes and plancton obtained in lotic and lentic environments were obtained from the upper Paraná River floodplain (in the states of Paraná and Mato Grosso do Sul, Brazil. Macrophytes were collected in homogeneous stands and washed. Plankton samples, taken from the water column surface and bottom, were obtained using a motor pump, with a 70 mum mesh plankton net for filtration. Twelve taxa of Cyclopidae were identified. Among them, Macrocyclops albidus albidus, Paracyclops chiltoni, Ectocyclops rubescens, Homocyclops ater, Eucyclops solitarius, Mesocyclops longisetus curvatus, Mesocyclops ogunnus, and Microcyclops finitimus were new finds for this floodplain. Eight species were recorded exclusively in aquatic macrophyte samples. Among these species, M. albidus albidus and M. finitimus presented greatest abundances. Only four species were recorded in plankton samples, and Thermocyclops minutus and Thermocyclops decipiens are limited to this type of habitat. Among these four species, T. minutus is the most abundant, especially in lentic habitats.

  19. Cyclopidae (Crustacea, Copepoda from the upper Paraná River floodplain, Brazil

    Directory of Open Access Journals (Sweden)

    F. A. LANSAC-TÔHA

    Full Text Available Cyclopid copepods from samples of fauna associated with aquatic macrophytes and plancton obtained in lotic and lentic environments were obtained from the upper Paraná River floodplain (in the states of Paraná and Mato Grosso do Sul, Brazil. Macrophytes were collected in homogeneous stands and washed. Plankton samples, taken from the water column surface and bottom, were obtained using a motor pump, with a 70 mum mesh plankton net for filtration. Twelve taxa of Cyclopidae were identified. Among them, Macrocyclops albidus albidus, Paracyclops chiltoni, Ectocyclops rubescens, Homocyclops ater, Eucyclops solitarius, Mesocyclops longisetus curvatus, Mesocyclops ogunnus, and Microcyclops finitimus were new finds for this floodplain. Eight species were recorded exclusively in aquatic macrophyte samples. Among these species, M. albidus albidus and M. finitimus presented greatest abundances. Only four species were recorded in plankton samples, and Thermocyclops minutus and Thermocyclops decipiens are limited to this type of habitat. Among these four species, T. minutus is the most abundant, especially in lentic habitats.

  20. Cyclopidae (Crustacea, Copepoda) from the upper Paraná River floodplain, Brazil.

    Science.gov (United States)

    Lansac-Tôha, F A; Velho, L F M; Higuti, J; Takahashi, E M

    2002-02-01

    Cyclopid copepods from samples of fauna associated with aquatic macrophytes and plancton obtained in lotic and lentic environments were obtained from the upper Paraná River floodplain (in the states of Paraná and Mato Grosso do Sul, Brazil). Macrophytes were collected in homogeneous stands and washed. Plankton samples, taken from the water column surface and bottom, were obtained using a motor pump, with a 70 microns mesh plankton net for filtration. Twelve taxa of Cyclopidae were identified. Among them, Macrocyclops albidus albidus, Paracyclops chiltoni, Ectocyclops rubescens, Homocyclops ater, Eucyclops solitarius, Mesocyclops longisetus curvatus, Mesocyclops ogunnus, and Microcyclops finitimus were new finds for this floodplain. Eight species were recorded exclusively in aquatic macrophyte samples. Among these species, M. albidus albidus and M. finitimus presented greatest abundances. Only four species were recorded in plankton samples, and Thermocyclops minutus and Thermocyclops decipiens are limited to this type of habitat. Among these four species, T. minutus is the most abundant, especially in lentic habitats.

  1. Evolution through cold and deep waters: the molecular phylogeny of the Lithodidae (Crustacea: Decapoda)

    Science.gov (United States)

    Hall, Sally; Thatje, Sven

    2018-04-01

    The objectives of this work are to use gene sequence data to assess the hypothesis that the Lithodinae arose from ancestors with uncalcified abdomens in shallow waters of the North-East Pacific, investigate the monophyly and interrelationships of genera within the Lithodinae and to estimate the scale and minimum number of biogeographic transitions from the shallow environment to the deep sea and vice versa. To do this, phylogenetic analysis from three mitochondrial and three nuclear markers was conducted using minimum evolution, maximum likelihood and Bayesian methods. The Lithodinae as defined to include North Pacific genus Cryptolithodes may be paraphyletic, with the Hapalogastrinae and Cryptolithodes as sister taxa. This implies that the soft-bodied abdomen of the Hapalogastrinae might not be plesiomorphic for the Lithodidae. Paralomis, Lopholithodes, Phyllolithodes, Lithodes and Neolithodes share a common ancestor, from which the North Pacific Hapalogastrinae did not descend. Lithodid ancestors are likely to have had a north Pacific, shallow water distribution and to have had planktotrophic larvae. North Pacific genus Paralithodes is paraphyletic; P. brevipes is the most basal member of the genus (as sampled) while P. camtschaticus and P. platypus are more closely related to the genera Lithodes and Neolithodes. Genera Lithodes, Neolithodes and Paralomis (as sampled) are monophyletic if Glyptolithodes is included within Paralomis. Lopholithodes is closely related to, but not included within, the Paralomis genus. Paralomis is divided into at least two major lineages: one containing South Atlantic, West African, and Indian Ocean species, and the other containing Pacific and South American species. Several species of Paralomis do not resolve consistently with any other groups sampled, implying a complex and possibly rapid global evolution early in the history of the genus. Relationships within the Lithodes genus vary between analytical methods, suggesting that conclusions may not be stable. Consistently, however, Indian Ocean and Pacific forms— L. murrayi, L. longispina and L. nintokuae form a group separated from Atlantic species such as L. santolla, L. confundens, L. maja and L. ferox.

  2. Diversity and Spatial Distribution of Extant Freshwater Ostracodes (Crustacea in Ancient Lake Ohrid (Macedonia/Albania

    Directory of Open Access Journals (Sweden)

    Julia Lorenschat

    2014-07-01

    Full Text Available We carried out an intensive sampling survey in ancient Lake Ohrid (Macedonia/Albania, covering all seasons, to determine total species number, relative species abundances and spatial distribution of Ostracoda. We identified 32 living species that belong to seven families (Candonidae, Ilyocyprididae, Cyprididae, Leptocytheridae, Limnocytheridae, Cytherideidae, and Darwinulidae and 15 genera (Candona, Fabaeformiscandona, Candonopsis, Cypria, Cyclocypris, Ilyocypris, Eucypris, Prionocypris, Bradleystrandesia, Herpetocypris, Dolerocypris, Amnicythere, Paralimnocythere, Cytherissa, and Darwinula. Six additional species were identified from empty carapaces and valves. Dominant families in Lake Ohrid were Candonidae and Limnocytheridae, representing 53% and 16% of all species, respectively. Prevalence of species flocks in these two families confirms the “young” ancient status of the lake. Amnicythere displays a preference for oligo-haline to meso-haline waters, but some species are found in saline environments, which suggests Lake Ohrid has a marine history. Recent studies, however, indicate fluvial/glaciofluvial deposition at the onset of Lake Ohrid sedimentation. Candona is the most diverse genus in Lake Ohrid, represented by 12 living species. Paralimnocythere is represented by five living species and all other genera are represented by one or two species. Reports of Candona bimucronata, Ilyocypris bradyi, Eucypris virens, Eucypris sp., Prionocypris zenkeri, Bradleystrandesia reticulate, Herpetocypris sp. 2, and Dolerocypris sinensis are firsts for this lake. Living ostracodes were collected at the maximum water depth (280 m in the lake (Candona hadzistei, C. marginatoides, C. media, C. ovalis, C. vidua, Fabaeformiscandona krstici, Cypria lacustris, C. obliqua and Amnicythere karamani. Cypria lacustris was overall the most abundant species and Cypria obliqua displayed the highest abundance at 280 m water depth. Principal environmental variables that influence ostracode distributions in Lake Ohrid are water depth and conductivity. In general, species richness, diversity and evenness were greater in waters <60 m deep, with highest values often found in the littoral zone, at depths <30 m. Candonids, however, displayed highest diversity in the sublittoral (30–50 m and profundal (50–280 m zones. The most frequent species encountered are taxa endemic to the lake (14 living species, which have a wide depth range (≤280 m, and display higher abundance with greater water depth. Non-endemic species were rare, limited to water depths <50 m, and were found mainly in the north part of the lake where anthropogenic pressure is high. Several cosmopolitan species were encountered for the first time, which suggests that these widespread species are new arrivals that may replace endemics as human impacts increase.

  3. First record of Cladocera (Crustacea: Chydoridae) from Parque Nacional do Itatiaia, Southeastern Brazil

    OpenAIRE

    Sousa, Francisco; Elmoor-Loureiro, Lourdes; Quadra, Adriana; Senna, André

    2014-01-01

    Surveying the fauna in conservation areas is an important strategy to recognize patterns of richness and endemism and to reduce gaps related to geographical distribution. This study presents the first record of cladocerans in the Parque Nacional do Itatiaia, Southeastern Brazil. Alona ossiani, Alona guttata, Alona iheringula, Alona yara, and Briospylus repens were observed in different environments. Here, we provide the taxonomic status and geographic distribution of each species observed in ...

  4. A new species of Argulus (Crustacea: Branchiura) from a bony fish ...

    African Journals Online (AJOL)

    The new species is characterized by the unique shape of the antennule, antenna and maxilla. In addition, huge scales are present on the mouth tube and smaller scales are present on the base of the mouth tube. A row of small spines is present inside the sucker rim of the maxillule. A round dimpled structure occurs ventral ...

  5. Thermal biology of the sub-polar–temperate estuarine crab Hemigrapsus crenulatus (Crustacea: Decapoda: Varunidae

    Directory of Open Access Journals (Sweden)

    Juan P. Cumillaf

    2016-03-01

    Full Text Available Optimum temperatures can be measured through aerobic scope, preferred temperatures or growth. A complete thermal window, including optimum, transition (Pejus and critical temperatures (CT, can be described if preferred temperatures and CT are defined. The crustacean Hemigrapsus crenulatus was used as a model species to evaluate the effect of acclimation temperature on: (i thermal preference and width of thermal window, (ii respiratory metabolism, and (iii haemolymph proteins. Dependant on acclimation temperature, preferred temperature was between 11.8°C and 25.2°C while CT was found between a minimum of 2.7°C (CTmin and a maximum of 35.9°C (CTmax. These data and data from tropical and temperate crustaceans were compared to examine the association between environmental temperature and thermal tolerance. Temperate species have a CTmax limit around 35°C that corresponded with the low CTmax limit of tropical species (34–36°C. Tropical species showed a CTmin limit around 9°C similar to the maximum CTmin of temperate species (5–6°C. The maximum CTmin of deep sea species that occur in cold environments (2.5°C matched the low CTmin values (3.2°C of temperate species. Results also indicate that the energy required to activate the enzyme complex (Ei involved in respiratory metabolism of ectotherms changes along the latitudinal gradient of temperature.

  6. External morphology of Lightiella monniotae (Crustacea, Cephalocarida) in the light of Cambrian 'Orsten' crustaceans

    DEFF Research Database (Denmark)

    Olesen, Jørgen; Haug, Joachim T.; Maas, Andreas

    2011-01-01

    in a broader perspective of crustacean phylogeny. Among the new findings or conclusions are: (1) Lightiella is in need of a revision since several assumed differences between the species are questionable or subject to intraspecific variability; (2) the cuticle of the trunk-limb basipod is sub......-divided into a number of smaller sclerotized areas as in various exceptionally 3D preserved fossil crustaceans from Cambrian ‘Orsten’ faunal assemblages; (3) a small transitional portion on the post-maxillulary limbs in the area where the endopod and basipod connect is discussed as either a reduced, proximal endopod...... segment or as an evolutionary new joint of the basipod to enhance its flexibility; (4) the so-called pseud-epipod is interpreted as an outer branch of the exopod; (5) compared to ‘Orsten’ crustaceans many characters of the Cephalocarida are more modified than previously assumed, including the morphology...

  7. Barcoding of ancient lake ostracods (crustacea reveals cryptic speciation with extremely low distances.

    Directory of Open Access Journals (Sweden)

    Ivana Karanovic

    Full Text Available Ostracods are drastically reduced crustaceans, with never more than eight appendages enclosed between two valves, leaving only a limited number of morphological characters for species delineation. Conservative morphology of characters used to define genera, along with high variability of characters used to define species are creating problems in applying a morphospecies concept. A high intraspecific variability in a Lake Biwa (Japan endemic, Physocypria biwaensis (Okubo, 1990, has been observed previously but was never studied in detail. Two sympatric forms, differing in pigmentation and size, suggest a presence of reproductive isolation. The aim of this study is to employ molecular and morphometric tools to aid in species delineation within P. biwaensis complex and reconstruct their phylogenetic relationships. A fragment of the mtCOI gene was amplified from 30 specimens, and an additional 37 specimens were studied for morphological characters. Resulting phylogenies showed that each morphologically distinct form is associated with a distinct phylogenetic group based on mtDNA. The average pairwise distance is very low (5%, indicating a recent divergence time. I speculate that there is a possibility that one of them originated in the lake, while the other probably colonized it afterwards. This seems to be supported with an apparent niche partitioning at different depths. In spite of the fact that traditionally used sexual characters are highly variable in these two species, the morphometric analysis of shell and soft part related characters clearly delineates them and suggests that such characters may be useful for future detection of seemingly cryptic ostracod species.

  8. Spatial segregation of Darwinula stevensoni (Crustacea: Ostracoda genotypes in lentic and lotic habitats of Northern Italy

    Directory of Open Access Journals (Sweden)

    Andrea GANDOLFI

    2004-02-01

    Full Text Available The clonal structure of apomictic populations of Darwinula stevensoni from Northern Italy lacustrine and riverine habitats has been analysed by allozyme electrophoresis. Thirty two sites were sampled and a total of 748 individuals were analysed. Only one polymorphic locus, Gpi, turned out to have enough variation to be informative. Two thirds of all individuals were homozygous for the most frequent allele but the frequency of this genotype was significantly lower in rivers (16% than in lakes (92%. As a consequence homozygous clonal females are dominant in lacustrine habitats while heterozygous clonal females are dominant in riverine ones. Differences in genetic structure between habitats were observed even at distances of a few meters. Allele and genotype frequencies are significantly different between Lake Montorfano and its outflow (River Seveso and between Mantova lakes and their two tributaries, the River Mincio and Corniano Channel. The former is also the outflow of Lake Garda. By laboratory experiments, we previously reported difference between genotypes: homozygous females from Mantova lakes show significantly lower starvation tolerance than heterozygous females from River Mincio. We discuss the hypothesis that habitat segregation is related to this difference. Riverine females should be better adapted to low productivity ecosystems than lacustrine ones.

  9. Four new species of sand-burrowing Haustoriid Amphipoda (Crustacea) of Korea

    NARCIS (Netherlands)

    Jo, Young Won

    1990-01-01

    During intensive sandy beach sampling of the Korean coasts, only one haustoriid genus, Eohaustorius, which is endemic to the North Pacific, has been revealed. Four new species of this genus are described herein: E. stocki n. sp., E. longidactylus n. sp., E. spinigerus n. sp., and E. setulosus n. sp.

  10. Asellus and Gammarus spp. (Crustacea) in changing environments: effects of acid stress and habitat permanence

    Energy Technology Data Exchange (ETDEWEB)

    Hargeby, A.

    1993-03-01

    The research underlying this thesis included laboratory and field studies on how acid stress affects the benthic crustaceans Asellus aquaticus L. and Gammarus pulex (L.). A laboratory chamber was constructed to study growth and survival of G. pulex during acid stress. Low pH (6.0) caused 64-92% mortality within three weeks and reduced growth rate and food conversion efficiency in surviving animals. In a field experiment along a pH gradient, the mortality of G. pulex increased below pH 6. The whole-body content of sodium and potassium was reduced in surviving individuals, indicating osmoregulatory disturbance. In Asellus aquaticus, mortality was not affected by pH within the tested range (4.3-7.5). Laboratory experiments showed that interspecific interactions between A. aquaticus and G. pulex can include both exploitative competition and predation by G. pulex on A. aquaticus. Effects of seasonal habitat alterations was studied in a lake by comparing invertebrate assemblages associated with two species of submerged macroalgae (Characea), one perennial and one senescent during autumn. (28 refs.).

  11. The functional and physiological status of Gammarus fossarum (Crustacea; Amphipoda) exposed to secondary treated wastewater.

    Science.gov (United States)

    Bundschuh, Mirco; Zubrod, Jochen P; Schulz, Ralf

    2011-01-01

    Climate change scenarios predict lower flow rates during summer that may lead to higher proportions of wastewater in small and medium sized streams. Moreover, micropollutants (e.g. pharmaceuticals and other contaminants) continuously enter aquatic environments via treated wastewater. However, there is a paucity of knowledge, whether extended exposure to secondary treated wastewater disrupts important ecosystem functions, e.g. leaf breakdown. Therefore, the amphipod shredder Gammarus fossarum was exposed to natural stream water (n=34) and secondary treated wastewater (n=32) for four weeks in a semi-static test system under laboratory conditions. G. fossarum exposed to wastewater showed significant reductions in feeding rate (25%), absolute consumption (35%), food assimilation (50%), dry weight (18%) and lipid content (22%). Thus, high proportions of wastewater in the stream flow may affect both the breakdown rates of leaf material and thus the availability of energy for the aquatic food web as well as the energy budget of G. fossarum. Copyright © 2010 Elsevier Ltd. All rights reserved.

  12. The functional and physiological status of Gammarus fossarum (Crustacea; Amphipoda) exposed to secondary treated wastewater

    Energy Technology Data Exchange (ETDEWEB)

    Bundschuh, Mirco, E-mail: bundschuh@uni-landau.d [Institute for Environmental Sciences, University of Koblenz-Landau, Fortstrasse 7, D-76829 Landau, Rhineland-Palatinate (Germany); Zubrod, Jochen P.; Schulz, Ralf [Institute for Environmental Sciences, University of Koblenz-Landau, Fortstrasse 7, D-76829 Landau, Rhineland-Palatinate (Germany)

    2011-01-15

    Climate change scenarios predict lower flow rates during summer that may lead to higher proportions of wastewater in small and medium sized streams. Moreover, micropollutants (e.g. pharmaceuticals and other contaminants) continuously enter aquatic environments via treated wastewater. However, there is a paucity of knowledge, whether extended exposure to secondary treated wastewater disrupts important ecosystem functions, e.g. leaf breakdown. Therefore, the amphipod shredder Gammarus fossarum was exposed to natural stream water (n = 34) and secondary treated wastewater (n = 32) for four weeks in a semi-static test system under laboratory conditions. G. fossarum exposed to wastewater showed significant reductions in feeding rate (25%), absolute consumption (35%), food assimilation (50%), dry weight (18%) and lipid content (22%). Thus, high proportions of wastewater in the stream flow may affect both the breakdown rates of leaf material and thus the availability of energy for the aquatic food web as well as the energy budget of G. fossarum. - Micropollutants in wastewater cause functional and physiological alteration in a leaf-shredding amphipod.

  13. [Does sea-grass biomass control the density of peracarids (Crustacea: Peracarida) in tropical lagoons?].

    Science.gov (United States)

    Winfield, Ignacio; Cházaro-Olvera, Sergio; Alvarez, Fernando

    2007-03-01

    We analyzed the time-space variation of the peracarid crustaceans that inhabit seagrasses of the Alvarado Lagoon System, Veracruz, Gulf of Mexico. The organisms were collected from 108 samples in six sites with Ruppia maritima beds (December 1992 to November 1994). The assemblage was composed of 11 species. Eight species of Amphipoda (Hourstonius laguna, Cerapus benthophilus, Apocorophium louisianum, Grandidierella bonnieroides, Leptocheirus rhizophorae, Gammarus mucronatus, Melita longisetosa and Haustorius sp.), one of Isopoda (Cassidinidea ovalis) and two of Tanaidacea (Discapseudes holthuisi and Leptochelia savignyi) were identified. Taxocoenosis, density and biomass of peracarids showed seasonal pulses related to R. maritima biomass, salinity variation, epicontinental affluent and inlets. The species C. ovalis, G. mucronatus, A. louisianum and D. holthuisi were dominant.

  14. A revision of the European species of the Gammarus Locusta-group (Crustacea, Amphipoda)

    NARCIS (Netherlands)

    Stock, J.H.

    1967-01-01

    INTRODUCTION In the past, many authors emphasized the great variability in the morphology of the members of the genus Gammarus. At the same time, such "varieties" were distributed in waters ranging from entirely fresh to purely marine. Both ideas, the morphological variability and the great salinity

  15. Responses of the brackish-water amphipod Gammarus duebeni (crustacea) to saline sewage

    Science.gov (United States)

    Jones, M. B.; Johnson, I.

    Soon after the openiing of the Looe sewage treatment works (Cornwall, southwest England) in 1973, it became colonized by the brackish-water amphipod Gammarus duebeni Liljeborg. The works is unusual as it operates with saline sewage and has a tidally-based pattern of salinity fluctuation (S=13 to 34). Various responses of this unique amphipod population (sewage amphipods) have been compared with G. duebeni from the adjacent Looe River estuary (estuarine amphipods) in an attempt to identify long-term responses to sewage. Sewage amphipods were significantly smaller than their estuarine equivalents; the sewage population was biased significantly to males, whereas the sex ratio of the estuarine population significantly favours females. Compared with the estuary, the consistently lower oxygen levels in the works were reflected in significant differences in metabolism. Sewage amphipods maintained high levels of activity under hypoxia ( e.g. swimming), and the higher survival and lower rates of lactic acid accumulation under anoxia than estuarine individuals. In addition, sewage amphipods recovered more rapidly from anoxia and had a lower critical oxygen tension (p c) than estuarine amphipods. Sewage amphipods are exposed to higher levels of heavy metals associated with the domestic sewage and zinc concentrations are particularly elevated in the works. Exposure to elevated zinc concentrations resulted in similar patterns of body zinc uptake for sewage and estuarine Gammarus at high (30) and low (10) salinity, with zinc regulation apparently occuring to an external threshold of 200 γmgZn·dm -3. No consistent interpopulational differences in the effect ofzinc on zinc uptake or on osmoregulation have been identified. However, sewage amphipods had higher survival at all zinc/salinity combinations compared with estuarine individuals. These indicate that sewage amphipods are adapted to the unusual combination of conditions prevailing in the treatment works and, if reproductive isolation is confirmed, suggest that the speciation process may have commenced.

  16. An acanthocephalan parasite increases the salinity tolerance of the freshwater amphipod Gammarus roeseli (Crustacea: Gammaridae)

    Science.gov (United States)

    Piscart, Christophe; Webb, Dennis; Beisel, Jean Nicolas

    2007-09-01

    Studies of the influence of parasites on host fitness generally conclude that parasites have a strong negative effect on their hosts. In this study, we have investigated experimentally the role of Polymorphus minutus, an acanthocephalan parasite, on the salinity tolerance of the freshwater amphipod Gammarus roeseli, one of its intermediate hosts. Unexpectedly, P. minutus-infected gammarids were more tolerant to salinity stress than uninfected ones. The mean lethal salt concentrations for 50% mortality of hosts tested were 17.3 (infected) and 9.7 g/L (uninfected). The parasitic load (one or two parasites per host) did not affect the result. The size of hosts had no significant influence on the salinity tolerance of either infected or uninfected gammarids. The mobility of all types of gammarid decreased when the salinity exceeded 9.0 g/L, but there was no significant difference between infected and uninfected gammarids. We discuss the higher salinity tolerance of infected amphipods in relation to O2 consumption and osmoregulation. Finally, we demonstrate that the salinity tolerance is enhanced in the parasitized amphipod but without a significant change in behavior or an osmoregulatory adjustment.

  17. A new species of seagrass-boring Limnoria (Limnoriidae, Isopoda, Crustacea) from Japan.

    Science.gov (United States)

    Yoshino, Hiroki; Watabe, Hikari; Ohsawa, Takeshi A

    2017-02-15

    The marine seagrass-boring isopod, Limnoria rhombipunctata sp. nov. (Limnoriidae) is described from the rhizome of Phyllospadix iwatensis seagrass, in shallow coastal waters off Chiba Prefecture, Japan. L. rhombipunctata sp. nov. is distinguished from other Limnoria species by the unique carinae of pleonite 5 and pleotelson, two branched lacinia mobilis of the right mandible, 3 flagellar articles of antenna 1, and triangular epipod of the maxilliped. Specimens of L. magadanensis, a species similar to L. rhombipunctata sp. nov., are re-examined and compared with L. rhombipunctata sp. nov.

  18. [Evaluation of Psilocybe cubensis (Agaricales, Basidiomycota) toxicity over Artemia franciscana (Crustacea, Anostraca)].

    Science.gov (United States)

    Vega-Villasante, Fernando; Ruiz-González, Luis Eduardo; Guerrero-Galván, Saúl Rogelio; Guzmán-Dávalos, Laura

    2013-01-03

    Psilocybe cubensis is a species with psychodysleptic action that grows on cattle dung in pastures in the tropics and subtropics. This fungus has been widely used in Mexico since ancient times both for ceremonies and rituals, as well as for healing or medicinal purposes. Artemia franciscana is a crustacean frequently used as a model organism for toxicity testing. With the objective of determining the toxicity of P. cubensis, the results of a study with the extract of P. cubensis on nauplii and adults of the brine shrimp A. franciscana are presented. Specimens were collected at Bahía de Banderas, Jalisco, Mexico, and were dried and homogenized in artificial sea water. Bioassays were carried out on crystal vials filled with different concentrations of the extract of P. cubensis (EAP), and with potassium dichromate as reference toxic compound. The median lethal concentration (LC(50)) in nauplii and adults and the inhibition of cysts hatching in A. franciscana were calculated. Nauplii showed a LC(50) = 135 μg/ml, while adults a LC(50) = 172 μg/ml. Cysts' hatching was inhibited by the EAP at all tested concentrations. Under the conditions of this study, the extract of P. cubensis was toxic for nauplii and adults of A. franciscana. Copyright © 2011 Revista Iberoamericana de Micología. Published by Elsevier España, S.L. All rights reserved.

  19. Behavioural adaptations of argulid parasites (Crustacea: Branchiura) to major challenges in their life cycle.

    Science.gov (United States)

    Mikheev, V N; Pasternak, A F; Valtonen, E T

    2015-07-25

    Fish lice (Argulus spp.) are obligate ectoparasites, which contrary to most aquatic parasites, retain the ability to swim freely throughout the whole of their life. In fish farms, they can quickly increase in numbers and without effective control cause argulosis, which results in the reduced growth and survival of their fish hosts. The morphology of Argulus spp, including their sensory organs, is suitable for both parasitism and free-swimming. By spending a considerable amount of time away from their host, these parasites risk being excessively dispersed, which could endanger mating success. Here we present a review of recent studies on the behaviour of Argulus spp, especially the aggregative behaviour that mitigates the dilution of the parasite population. Aggregation of parasites, which is especially important during the period of reproduction, occurs on different scales and involves both the aggregation of the host and the aggregation of the parasites on the host. The main behavioural adaptations of Argulus spp, including searches for hosts and mates, host manipulation and host choice, are all focused on the fish. As these ectoparasites repeatedly change hosts and inflict skin damage, they can act as vectors for fish pathogens. The development of environmentally friendly measures for the control and prevention of argulosis needs to take into account the behaviour of the parasites.

  20. Host relation, size and reproduction in the burrowing barnacle Trypetesa lampas (Hancock) (Crustacea Cirripedia Acrothoracica)

    DEFF Research Database (Denmark)

    Nielsen, Sofie Katrine Dam; Høeg, Jens Thorvald; Yusa, Yoichi

    2016-01-01

    The aim of this study is to investigate the population biology of the burrowing barnacle Trypetesa lampas, a symbiont of hermit crabs and representing the little known cirripede group Acrothoracica. We put special emphasis on the hostbarnacle relation and reproduction. A total of 341 hermit crabs....... Reproduction seems to occur throughout the year. We found ovigerous females also in winter, although less frequently than in summer, and no difference in the number of dwarf males between the summer and winter samples. The data from the present study site deviates in many respects (prevalence, female and male...... load, reproductive cycle, host relation) from previous studies on this and closely related acrothoracican species. This emphasizes that a basic lack of knowledge still exists concerning most aspects of acrothoracican reproduction, life cycles and host relation....

  1. Evolution of morphology, ontogeny and life cycles within the Crustacea Thecostraca

    DEFF Research Database (Denmark)

    Høeg, Jens Thorvald; Perez-Losada, M; Glenner, H

    2009-01-01

    for the Cirripedia and reinforce the concept that this larva was a prerequisite to the tremendous success of that taxon. The evolution of parasitism, obligatory in three major taxa, is discussed. We conclude that the last common ancestor to the Cirripedia was most likely a suspension feeder, and the advanced...... metamorphosis and endoparasitism known from the Rhizocephala and strongly indicated for the Facetotecta are the result of convergent evolution. We also discuss reproductive systems, which range from separate sexes, over hermaphrodites combined with a separate male sex (androdioecy), to pure hermaphroditism...

  2. Biodiversity and Biogeography of Chthamalid Barnacles from the North-Eastern Pacific (Crustacea Cirripedia.

    Directory of Open Access Journals (Sweden)

    Benny K K Chan

    Full Text Available The biogeography and ecology of the species of Chthamalus present on the west coast of America are described, using data from 51 localities from Alaska to Panama, together with their zonation on the shore with respect to that of other barnacles. The species present were C. dalli, Pilsbry 1916, C. fissus, Darwin, 1854, C. anisopoma Pilsbry 1916 and four species in the C. panamensis complex. The latter are C. panamensis Pilsbry, 1916, C. hedgecocki, Pitombo & Burton, 2007, C. alani nom. nov. (formerly C. southwardorum Pitombo & Burton, 2007 and C. newmani sp. nov.. These four species were initially separated by enzyme electrophoresis. They could only be partially separated by DNA bar coding but may be separated using morphological characters.

  3. Three new Mediterranean Maera with remarks on the Quadrimana complex (Crustacea, Amphipoda, Melitidae)

    NARCIS (Netherlands)

    Krapp, Traudl; Marti, Amparo; Ruffo, Sandro

    1996-01-01

    Three new Mediterranean species of the Maera quadrimana complex are described and illustrated: Maera revelata from the western sector, M. ariadne from the eastern one and M. aurora from the entire Mediterranean. Maera inaequipes (A. Costa, 1857) is redescribed and its synonymy and geographical

  4. Chemosensory neurons in the mouthparts of the spiny lobsters Panulirus argus and Panulirus interruptus (Crustacea : Decapoda)

    DEFF Research Database (Denmark)

    Garm, Anders Lydik; Shabani, Shkelzen; Høeg, Jens Thorvald

    2005-01-01

    most potent single compounds being ammonium, adenosine-5'-monophosphate, taurine, glutamate, and aspartate. Cluster analysis indicated that the neurons constitute a heterogeneous population that could be placed into seven groups linked according to their most excitatory compound. These neurons......We studied electrophysiological properties of single chemosensory neurons in the mouthparts of the spiny lobsters Panulirus argus and Panulirus interruptus to complement our growing understanding of the behavioral roles of mouthparts of decapod crustaceans. Food mixtures and 13 single compounds...... were used to characterize the response specificity, sensitivity, and time course of individual neurons in the endopods of maxilliped 2 and 3. Additional chemoreceptors were found in the mandibular palp and basis of maxilliped 1 but they were not characterized. Neurons were broadly tuned, with the five...

  5. An annotated check-list of lophogastrids (Crustacea: Lophogastrida) from the seas of the Iberian Peninsula.

    Science.gov (United States)

    Vicente, Carlos San

    2016-10-26

    The zoogeographic distribution of lophogastrid species occurring in the diverse seas of the Iberian Peninsula and neighbouring areas is analysed. For each species, data on general distribution, bathymetric ranges, habitat and localities reported on published data are provided. A total of 16 lophogastrids species belonging to 6 genera have been recorded, representing the 30% of all known world extant species and the 67% of genera. Two of them are common to the Atlantic and the Mediterranean. All known Iberian species are present in the Macaronesian region, 43.8% in the North-western Atlantic and 12.5% in the western Mediterranean. Lophogastrid distributions suggest the existence of an evolution and distribution centre of the group located around the Macaronesian Islands.

  6. Ecophysiology of the cave isopod .i.Mesoniscus graniger./i. (Frivaldszky, 1865) (Crustacea: Isopoda)

    Czech Academy of Sciences Publication Activity Database

    Šustr, Vladimír; Elhottová, Dana; Krištůfek, Václav; Lukešová, Alena; Nováková, Alena; Tajovský, Karel; Tříska, Jan

    2005-01-01

    Roč. 41, 3-4 (2005), s. 69-75 ISSN 1164-5563 R&D Projects: GA AV ČR(CZ) KSK6005114 Institutional research plan: CEZ:AV0Z6066911 Keywords : isopoda * distribution * temperature Subject RIV: EH - Ecology, Behaviour Impact factor: 0.935, year: 2005

  7. Chirostylidae of Australia's western continental margin (Crustacea : Decapoda: Anomura), with the description of five new species.

    Science.gov (United States)

    Mccallum, Anna W; Poore, Gary C B

    2013-01-01

    Five new species from the squat lobster family Chirostylidae are described from the continental margin of western Australia: Uroptychus albus sp. nov., Uroptychus bardi sp. nov., Uroptychus jawi sp. nov., Uroptychus taylorae sp. nov., and Uroptychus worrorra sp. nov. New records of Indo-West Pacific species for Australia are: Gastroptychus brachyterus Baba, 2005, Gastroptychus investigatoris Alcock, 1899, Uroptychodes grandirostris (Yokoya, 1933), Uroptychodes inortenseni (Van Dam, 1939), Uroptychus scandens Benedict, 1902, Uroptychus ciliatus (Van Dam, 1933) and Uroptychus vandamae Baba, 1988. New distributional records are given for species previously recorded from Australia: Uroptychus flindersi Ahyong & Poore, 2004, Uroptychus hesperius Ahyong & Poore, 2004, Uroptychusjoloensis Van Dam, 1939, Uroptychus nigricapillis Alcock, 1901, and Uroptychus spinirostris (Ahyong & Poore, 2004). These new records expand the number of chirostylid species in Australia from 34 to 46. Keys to Australian species of the genera Gastroptychus, Uroptychodes and Uroptychus are provided.

  8. A new species of Munidopsis Whiteaves, 1874 (Crustacea: Decapoda: Anomura) from the Northwest Indian Ocean Ridge.

    Science.gov (United States)

    Dong, Dong; Li, Xinzheng; Zhou, Yadong; Wang, Chunsheng

    2016-08-23

    A new species, Munidopsis militaris n. sp., from the Carlsberg Ridge, Northwest Indian Ocean Ridge is described herein. The species belongs to a group of species having a pair of epigastric spines, mesial and lateral eye-spines, abdominal tergites unarmed, five or six spines on the lateral margin of the carapace, and a denticulate carina on the distolateral margin of the P1 fixed finger. It can be distinguished from its relatives by the spinous lateral margin of the palm and dorsal carinae on the P2-4 propodus. The Munidopsis fauna of the Indian Ocean Ridge is seldom reported on; this new species is the sixth member of this genus found inhabiting the Indian Ocean Ridge.

  9. A comprehensive and integrative reconstruction of evolutionary history for Anomura (Crustacea: Decapoda).

    Science.gov (United States)

    Bracken-Grissom, Heather D; Cannon, Maren E; Cabezas, Patricia; Feldmann, Rodney M; Schweitzer, Carrie E; Ahyong, Shane T; Felder, Darryl L; Lemaitre, Rafael; Crandall, Keith A

    2013-06-20

    The infraorder Anomura has long captivated the attention of evolutionary biologists due to its impressive morphological diversity and ecological adaptations. To date, 2500 extant species have been described but phylogenetic relationships at high taxonomic levels remain unresolved. Here, we reconstruct the evolutionary history-phylogeny, divergence times, character evolution and diversification-of this speciose clade. For this purpose, we sequenced two mitochondrial (16S and 12S) and three nuclear (H3, 18S and 28S) markers for 19 of the 20 extant families, using traditional Sanger and next-generation 454 sequencing methods. Molecular data were combined with 156 morphological characters in order to estimate the largest anomuran phylogeny to date. The anomuran fossil record allowed us to incorporate 31 fossils for divergence time analyses. Our best phylogenetic hypothesis (morphological + molecular data) supports most anomuran superfamilies and families as monophyletic. However, three families and eleven genera are recovered as para- and polyphyletic. Divergence time analysis dates the origin of Anomura to the Late Permian ~259 (224-296) MYA with many of the present day families radiating during the Jurassic and Early Cretaceous. Ancestral state reconstruction suggests that carcinization occurred independently 3 times within the group. The invasion of freshwater and terrestrial environments both occurred between the Late Cretaceous and Tertiary. Diversification analyses found the speciation rate to be low across Anomura, and we identify 2 major changes in the tempo of diversification; the most significant at the base of a clade that includes the squat-lobster family Chirostylidae. Our findings are compared against current classifications and previous hypotheses of anomuran relationships. Many families and genera appear to be poly- or paraphyletic suggesting a need for further taxonomic revisions at these levels. A divergence time analysis provides key insights into the origins of major lineages and events and the timing of morphological (body form) and ecological (habitat) transitions. Living anomuran biodiversity is the product of 2 major changes in the tempo of diversification; our initial insights suggest that the acquisition of a crab-like form did not act as a key innovation.

  10. Seasonality of larvae of Brachyura and Anomura (Crustacea Decapoda in the Beagle Channel, Argentina

    Directory of Open Access Journals (Sweden)

    Gustavo A. Lovrich

    1999-12-01

    Full Text Available This is the first study in the Beagle Channel that reports the larval seasonal distribution, abundance and duration of the larval stages of Anomura and Brachyura, on the basis of a fortnightly sampling programme. An identification key to the specific level of zoeal stages is included. Between September 1987 and March 1989, 304 plankton samples were taken by means of oblique hauls from the bottom to the sea-surface. Eighty-five percent of the samples were taken shallower than 60 m depth. Decapod larvae occurred only in spring and summer. All but two taxa showed a single cohort of larvae which emerge at the beginning of the spring. A second cohort of Munida spp. and Halicarcinus planatus also occurred during summer. The most abundant taxa were Munida spp. (312 larvae ? 10 m-3, Peltarion spinosulum (288 larvae ? 10 m-3,, H. planatus (143 larvae ? 10 m-3, and Pagurus spp. (79 larvae ? 10 m-3, which represented 97% of the total larvae collected. Larvae of Pinnotheridae, Eurypodius latreillii, Libidoclaea granaria, and Paralomis granulosa were about an order of magnitude less abundant. Relative abundances of larvae correspond to relative abundances of the respective benthic stages. The absence of certain larval stages or of certain species (Acanthocyclus albatrossis and Lithodes santolla probably indicates their differential distribution within the Beagle Channel. Particularly, lithodid larvae may have benthic or epibenthic habits.

  11. Phylogeny of the Anomura (Decapoda, Crustacea): Spermatozoa and spermatophore morphological evidence

    NARCIS (Netherlands)

    Tudge, Christopher C.

    1997-01-01

    A phylogenetic analysis of selected anomuran, thalassinidean, and other decapod crustacean taxa, based on spermatozoal ultrastructural characters and spermatophore morphological characters, was performed and the following relationships of the taxa are elucidated from the trees produced. The Anomura

  12. Spermatophore transfer in the hermit crab Clibanarius vittatus (Crustacea, Anomura, Diogenidae).

    Science.gov (United States)

    Hess, Gregory S; Bauer, Raymond T

    2002-08-01

    Although mating has been described in several hermit crab species, the mechanics of spermatophore transfer have not previously been demonstrated. Evidence from pleopod and gonopore morphology, video observations, and inseminated females indicates that in Clibanarius vittatus the male applies a spermatophoric mass directly onto the female via the gonopores rather than with modified pleopods 1-2 (gonopods) and/or genital papillae as in many other decapods. The single second pleopod of males of C. vittatus has a simple endopod with no apparent modifications for sperm transfer. There are no genital papillae extending from the male gonopores. The globular spermatophores are aligned in rows surrounded by a seminal secretion in the male ducts (vasa deferentia that terminate in ejaculatory ducts opening to the exterior via the gonopores). During copulation, described from time-lapse video recordings, the ventral surface of the last thoracic segment of the male, bearing the gonopores, was apposed to the ventral cephalothorax of the female. A massive amount of seminal secretion containing spermatophore ribbons, termed here the spermatophoric mass and described for the first time in a hermit crab species, was observed covering the sternites and coxae of pereopods 1-5 of a recently copulated female. It is suggested that during copulation the male emits the contents of the ejaculatory ducts directly onto the female without the aid of gonopods or genital papillae. Although spermatophore transfer is simple in C. vittatus, the presence of modified anterior pleopods or elongate genital papillae (sexual tubes) in other paguroidean species suggests the possibility of a more complex insemination process in these other hermit crabs. Copyright 2002 Wiley-Liss, Inc.

  13. A collection of Thalassinidea, Anomura and Brachyura (Crustacea: Decapoda) from the Kimberley region of Northwestern Australia

    NARCIS (Netherlands)

    Morgan, G.J.

    1990-01-01

    One hundred and five species of thalassinidean, anomuran and brachyuran decapod crustaceans are recorded from a 1988 collecting expedition to the Kimberley region of northwestern Australia. An additional 70 species are recorded from the literature. One new species of pagurid hermit crab and a new

  14. A new species of the hermit crab genus Diogenes (Crustacea: Decapoda: Anomura: Diogenidae) from southern India.

    Science.gov (United States)

    Komai, Tomoyuki; Reshmi, Rema; Kumar, Appukuttannair Biju

    2013-02-12

    A new species of the hermit crab genus Diogenes Dana, 1851 (Diogenidae), D. canaliculatus, is described and illustrated on the basis of material from off the Kerala State, southern India. It is referred to the D. edwardsii (De Haan, 1849) species group, and compared with D. bicristimanus Alcock, 1905, D. fasciatus Rahayu & Forest, 1995, D. laevicarpus Rahayu, 1996 and D. moosai Rahayu & Forest, 1995. The characteristically sculptured left chela and the unarmed dorsal margins of the propodi of the second and third pereopods distinguish the new species from these congeners.

  15. More species of the Agononida incerta complex revealed by molecules and morphology (Crustacea: Decapoda: Anomura: Munididae).

    Science.gov (United States)

    Poore, Gary C B; Andreakis, Nikos

    2014-09-05

    Squat lobsters from Madagascar, Vanuatu, Papua New Guinea, Fiji, eastern Australia and French Polynesia belonging to the Agononida incerta (Henderson, 1888) species complex are described as four new species: A. madagascerta, A. polycerta, A. tasmancerta and A. vanuacerta. This brings to ten the number of species in this complex. All species are morphologically distinguishable only on the basis of the shape of the anterolateral margin of the telson and setation of the dactyli of pereopods 2-4. The morphological delineation of nine of the species and their taxonomic status are robustly supported by phylogenetic analysis of the partial 16S rDNA gene and the partial mitochondrial cytochrome oxidase subunit 1 genes, and in some cases by colour. A phylogenetic analysis of the nine species for which molecular data are available grouped the species in two clades, one of four species with facial spines on the upper surface of pereopod 4 and the other of five species lacking facial spines. 

  16. First Report of Two Diogenid Species of Hermit Crabs (Crustacea: Decapoda: Anomura from Korea

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    Jung, Jibom

    2015-04-01

    Full Text Available Two diogenid hermit crab species, Dardanus lagopodes and Diogenes deflectomanus, are newly reported from Korea. Dardanus lagopodes is distinguished from the other species of genus Dardanus in Korea by having setae with cream-colored tips on the cephalothorax and the following characteristics: ocular peduncles somewhat longer than antennular peduncles, and the pereopod without a longitudinal sulcus and scute-like projections. Diogenes deflectomanus is similar to D. nitidimanus but can be distinguished by having the fixed finger of the left cheliped bent slightly downwardly and the following characteristics: slightly shorter ocular peduncle, elongated left cheliped with small granules on the surface, right cheliped without calcareous teeth on the cutting edge of the dactylus, and the minute spine of post-median margin of the telson is not well developed. The geographical distributions of these two species are extended by the present study. In particular, D. deflectomanus in the current study is the first report outside Chinese waters. Now, 20 species of the family Diogenidae are known in Korean waters.

  17. From the Palaeontological Collection of the Universalmuseum Joanneum – The Cenozoic Decapod Crustaceans (Crustacea: Malacostraca: Decapoda)

    Science.gov (United States)

    Hyžný, Matúš; Gross, Martin

    2017-01-01

    Cenozoic decapod crustaceans housed in the collections of the Universalmuseum Joanneum (Graz, Austria) are reviewed. Previous descriptions, geographic and stratigraphic provenance and collection history are discussed. Altogether 72 specimens are figured, including five holotypes. Taxonomic affinity of previously unpublished material is addressed. Gebiacantha sp. from the middle Miocene of Wetzelsdorf is the first fossil record of the genus from the Paratethys. PMID:28239309

  18. A new distinctive species of pagurid hermit crab (Crustacea: Decapoda: Anomura) from Japan.

    Science.gov (United States)

    Komai, T; Osawa, M

    2001-12-01

    A new species of pagurid hermit crab, Pagurus decimbranchiae, is described and illustrated based on 20 specimens collected from shallow waters of the Pacific coast of Japan ranging from Boso Peninsula to Tanegashima Island. It is quite distinctive in having the rudimentary arthrobranch on the third maxilliped represented by a single bud, however close morphological similarity is found between the new species and P. moluccensis Haig and Ball. Comparisons are also made among other species, including P. boriaustraliensis Morgan, P. sp. cf. boriaustraliensis sensu Rahayu and Komai (2000) and the members of the P. anachoretus group. The present generic assignment of the new species should be considered provisional, as more extensive study is needed to investigate phylogenetic relationships of the new species and the other species of Pagurus.

  19. The complete mitogenome of the porcelain crab Petrolisthes haswelli Miers, 1884 (Crustacea: Decapoda: Anomura).

    Science.gov (United States)

    Tan, Mun Hua; Gan, Han Ming; Lee, Yin Peng; Austin, Christopher M

    2016-11-01

    The mitochondrial genome sequence of the porcellanid crab, Petrolisthes haswelli is provided, making it the second for the family Porcellanidae and the third for the superfamily Galatheoidea. Petrolisthes haswelli has a mitogenome of 15,348 bp consisting of 13 protein-coding genes, two ribosomal subunit genes, 22 transfer RNAs and a non-coding AT-rich region. The base composition of the P. haswelli mitogenome is 35.66% for T, 18.65% for C, 34.35% for A and 11.34% for G, with an AT bias of 70.01%. The mitogenome gene order is identical to the mitogenome of Neopetrolisthes maculatus, the only other species of the family with a sequenced mitogenome.

  20. First Report of Two Species of Genus Raymunida (Crustacea: Decapoda: Anomura from Korea

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    Sanghui Lee

    2013-10-01

    Full Text Available Two species of squat lobsters, Raymunida formosanus Lin, Chan and Chu, 2004 and Raymunida lineata Osawa, 2005, are newly added to the Korean decapod fauna. The genus Raymunida Macpherson and Machordom, 2000 is also reported for the first time in Korea. It differs morphologically from other Korean genera, Munida and Paramunida, in having the first to third pereopods with epipods and the carpus of the third maxilliped with a distal spine on flexor margin. Illustrations and pictures of these two species are provided with descriptions, and the key to the species of Korean Munidids is also provided.

  1. Description of the newly-hatched juvenile of Aegla castro Schmitt, 1942 (Crustacea, Anomura, Aeglidae).

    Science.gov (United States)

    Silva, Luane Samara Alves E; Guerrero-Ocampo, Cecilia Margarita; Negreiros-Fransozo, Maria Lucia; Teixeira, Gustavo Monteiro

    2017-02-26

    This study describes and illustrates the morphology of the first juvenile stage of Aegla castro Schmitt, 1942. Ovigerous females were collected from May to July 2013, in Couro River (Mauá da Serra, Paraná, Brazil). These females were kept individually under controlled feeding, aeration, water temperature and quality and checked daily for hatching of juveniles. The newly-hatched juveniles were fixed in alcohol series and kept in 70% alcohol with glycerin in a 2:1 ratio prior to study under light microscopy. The newly-hatched juvenile of A. castro is the largest among aeglid species whose juveniles have been described. Aegla castro has asynchronous hatching. Some specimens were analyzed using scanning electron microscopy, revealing details of the setal morphology, some cephalothoracic appendages and lineae aeglicae. The number of setae in newly-hatched A. castro is lower than that described for other species, but does not appear to be diagnostic. However, A. castro is the only species described that combines the presence of four plumose setae on the third maxilliped exopod and 63-65 plumose setae on the maxilla exopod.

  2. Agononida Baba and de saint Laurent, 1996 (Crustacea: Decapoda: Anomura: Galatheoidea: Munididae) from Chinese waters

    Science.gov (United States)

    Dong, Chao; Li, Xinzheng

    2013-11-01

    The present paper reports five species of squat lobster, genus Agononida Baba and de Saint Laurent, 1996, of which A. squamosa (Henderson, 1885) and A. cf. variabilis (Baba, 1988) were not previously reported in Chinese waters. All the specimens are kept in the Marine Biological Museum collection in the Institute of Oceanology, Chinese Academy of Sciences, Qingdao. To date, there have been 11 species of this genus recorded from China's seas. A key to those species is provided in this paper.

  3. Uroptychodes, new genus of Chirostylidae (Crustacea: Decapoda: Anomura, with description of three new species

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    Keiji Baba

    2004-03-01

    Full Text Available Examination of materials collected from Indonesia, New Caledonia and vicinity, now deposited in the Muséum National d´Histoire Naturelle, disclosed three additional undescribed species of chirostylids belonging to the Uroptychus spinimarginatus group. The group is now shifted to a distinct genus Uroptychodes. Uroptychus grandirostris Yokoya, 1933, which can be transferred to Uroptychodes, has been a problematic species because of the brevity of the original description and the loss of the type material. However, a recent finding of a specimen, which is in poor condition, very much like the illustration of U. grandirostris by Yokoya (1933: Fig. 29, but different from the description of U. grandirostris given by van Dam (1939 for one of the type specimens, suggests that the type material of U. grandirostris includes at least two species. In this paper a neotype is selected for U. grandirostris. The genus Uroptychodes now contains 10 species. All these species are reviewed and a key to the species of the genus is provided.

  4. An annotated checklist of hermit crabs (Crustacea, Decapoda, Anomura of Indian waters with three new records

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    Jigneshkumar N. Trivedi

    2017-06-01

    Full Text Available The annotated checklist of hermit crabs occurring in the Indian waters has been compiled based on published literature and specimens collected by us along the Indian coastline from 2010 to 2016. The checklist records 112 species belonging to 26 genera and five families. The east coast of India, with 81 species is more diverse than the west coast of India (73 species. Maximum species diversity was recorded from coastal areas of Tamil Nadu state (50 species whereas the least number of species were reported from coastal areas of Maharashtra state (7 species. Distribution of three species belonging to the family Diogenidae namely Areopaguristes perspicax (Nobili, 1906, Clibanarius virescens (Krauss, 1843, and Diogenes lophochir (Morgan, 1989 is for the first time recorded in Indian waters.

  5. First Record of Aliaporcellana and Lissoporcellana (Crustacea: Decapoda: Porcellanidae from Korea

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    Lee, Sanghui

    2015-07-01

    Full Text Available Two porcelain crab species, Aliaporcellana pygmaea (De Man, 1902 and Lissoporcellana nakasonei (Miyake, 1978, are reported here for the first time from Korean waters based on specimens collected from Jeju Island, Korea. The genus Aliaporcellana Nakasone and Miyake, 1969, and Lissoporcellana Haig, 1978 are also reported here for the first time in Korea. Aliaporcellana pygmaea has a wide distribution. The specimen reported here is the most northern record of this species. While, Lissoporcellana nakasonei, associated with anthozoans, was known for distributing range from New Caledonia to southern Japan. As a result, the distribution rage of L. nakasonei is changed to Korea. Now, 12 species of porcelain crabs have been reported in Korean waters.

  6. Reexamination of Pagurus minutus Hess, 1865, and Pagurus filholi (de Man, 1887) (Crustacea: Anomura: Paguridae)

    NARCIS (Netherlands)

    Sandberg, L.; McLaughlin, P.A.

    1993-01-01

    The type specimens of Pagurus minutus Hess, 1865 and P. filholi (de Man, 1887) have been reexamined. Both are valid species, correctly assigned to Pagurus. Pagurus filholi has proved to be the senior synonym of Pagurus geminus McLaughlin, 1976.

  7. Galatheids, chirostylids and porcellanids (Crustacea, Decapoda, Anomura) from the Eocene and Oligocene of Vicenza (northern Italy)

    NARCIS (Netherlands)

    Angeli, De Antonio; Garassino, Alessandro

    2003-01-01

    At Monte Magrè a series of calcarenites of Ypresian and Lutetian age is exposed. The anomuran faunas were collected from the lower strata in this succession, along the road from Monte MagrË to Monte di Malo. These levels, indurated and white in color, contain nummulitid foraminifera, nodules and

  8. Larval descriptions of the family Porcellanidae: A worldwide annotated compilation of the literature (Crustacea, Decapoda)

    Science.gov (United States)

    Vela, María José; González-Gordillo, Juan Ignacio

    2016-01-01

    Abstract For most of the family Porcellanidae, which comprises 283 species, larval development remains to be described. Full development has been only described for 52 species, while part of the larval cycle has been described for 45 species. The importance of knowing the complete larval development of a species goes beyond allowing the identification of larval specimens collected in the plankton. Morphological larval data also constitute a support to cladistic techniques used in the establishment of the phylogenetic status (see Hiller et al. 2006, Marco-Herrero et al. 2013). Nevertheless, the literature on the larval development of this family is old and widely dispersed and in many cases it is difficult to collect the available information on a particular taxon. Towards the aim of facilitating future research, all information available on the larval development of porcellanids has been compiled. Following the taxonomic checklist of Porcellanidae proposed by Osawa and McLaughlin (2010), a checklist has been prepared that reflects the current knowledge about larval development of the group including larval stages and the method used to obtain the larvae, together with references. Those species for which the recognised names have been changed according to Osawa and McLaughlin (2010) are indicated. PMID:27081332

  9. A New Report of Two Species of Pagurid Hermit Crabs (Crustacea: Decapoda: Anomura from Korea

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    Won Kim

    2014-01-01

    Full Text Available Pagurus undosus and Pagurus parvispina, collected from the East Sea by fishery trap, are newly recorded from Korean waters. Pagurus undosus is distinguished from other hermit crab by its right cheliped slightly elevated medially, and with broad ridge formed by deep depressions mesial and lateral to midline. Pagurus parvispina is distinguished from other hermit crab by its right cheliped covered with large spine and long tufts of setae. These species live in cold water areas and their geographical distribution is extended southwardly by the present study. A specimen of the former species, P. undosus, was found living in a shelter formed by a sponge, similar to that observed in Pagurus pectinatus. Descriptions and figures of these two species are provided in this paper. Currently, 27 species of the genus Pagurus are recorded in Korean fauna.

  10. Presencia de Munidopsis robusta en el Caribe colombiano (A. Milne Edwards, 1880 (Crustacea: Anomura: Munidopsidae

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    Adriana Bermúdez

    2013-12-01

    Full Text Available The first record of M. robusta in Colombia is presented. The specimens were collected by demersal trawling at 500 m depth in front of the departments of La Guajira and Bolívar using a semi-ballon net. Collected specimens were washed onboard with seawater and preserved in 95 % ethanol. The characteristics of the water column were measured with a multi-parameter CTDO instrument. Sediments were collected using a Box-corer and a granulometric analysis was performed. A species diagnosis is presented together with comments regarding its distribution and bathymetric and geographic ranges. With this new record, the number of Colombian species of Munidopsis increases to 23. Moreover, the distribution of this species for the Caribbean is extended.

  11. The occurrence of Callinectes arcuatus ordway, 1863 (Crustacea, Decapoda, Portunidae in Bahia, Brazil

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    Edilson Pires de Gouvêa

    1987-01-01

    Full Text Available During the study of the Carcinofauna of the Bahian Coast, some Brachyura Portunidae were found. Some of these animals were Callinectes arcuatus Ordway, 1863 which has its distribution restricted to the Pacific Ocean, from California to Peru and the Galapagos Islands. This is the first occurrence of this species reported from the Atlantic Ocean and the Brazilian Coast (Bahia, 38º50'Wand 12º50'S.Durante o estudo da carcinofauna do litoral baiano, muitos Braquiuros Portunidae foram encontrados. Alguns destes animais foram Callinectes arcuatus Ordway, 1863 que possuia sua distribuição restrita da Califórnia ao Peru e Ilhas Galápagos, no Oceano Pacífico. Esta é a primeira ocorrência desta espécie no Oceano Atlântico e na Costa Brasileira. (Bahia, 12º50'S e 38º50'W.

  12. Physiological and behavioural responses of Gammarus pulex (Crustacea: Amphipoda) exposed to cadmium

    International Nuclear Information System (INIS)

    Felten, V.; Charmantier, G.; Mons, R.; Geffard, A.; Rousselle, P.; Coquery, M.; Garric, J.; Geffard, O.

    2008-01-01

    The aim of this study was to investigate the effects of cadmium on physiological and behavioural responses in Gammarus pulex. In a first experiment, cadmium LC50s for different times were evaluated in 264 h experiment under continuous mode of exposure (LC50 96h = 82.1 μg L -1 , LC50 120h = 37.1 μg L -1 , LC50 168h = 21.6 μg L -1 , LC50 264h = 10.5 μg L -1 ). In a second experiment, the physiological and behavioural responses of the amphipod exposed to cadmium (0, 7.5 and 15 μg L -1 ) were investigated under laboratory conditions. The mortality and the whole body cadmium concentration of organisms exposed to cadmium were significantly higher than in controls. Concerning physiological responses, cadmium exposure exerted a significant decrease on osmolality and haemolymph Ca 2+ concentration, but not on haemolymph Na + and Cl - concentrations, whereas the Na + /K + -ATPase activity was significantly increased. Behavioural responses, such as feeding rate, locomotor and ventilatory activities, were significantly reduced in Cd exposed organisms. Mechanism of cadmium action and consequent energetic reallocation in favour of maintenance functions (i.e., osmoregulation) are discussed. The results of this study indicate that osmolality and locomotor activity in G. pulex could be effective ecophysiological/behavioural markers to monitor freshwater ecosystem and to assess the health of organisms

  13. New localities for Crustacea Decapoda in the Magellan region, southern South America

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    Julio H. Vinuesa

    1999-12-01

    Full Text Available We report the occurrence of Lithodes turkayi (Anomura, Libidoclaea granaria, and C. edwardsii (Brachyura, in the Beagle Channel. This observation extends their range of distribution south of the previously reported limit of the Straits of Magellan. Acanthocyclus albatrossis (Brachyura occurs south of Isla Navarino and also in the Beagle Channel, however in a particular habitat of its northern coast. The occurrence of Lithodes confundens (formerly identified as L. antarcticus north of the eastern entrance of the Straits of Magellan is also reported. We extend its range of distribution northerly and its bathymetric distribution to the intertidal.

  14. Sphaeromatidae (Crustacea, Isopoda) of the Beagle Channel and description of Cymodopsis beageli n. sp

    NARCIS (Netherlands)

    Brandt, Angelina

    1998-01-01

    During an expedition with RV Victor Hensen (1994) and the RV Polarstern (1996) Isopoda Sphaeromatidae were collected in and off the eastern entrance of the Beagle Channel. The species found, Caecocassidias patagonica Kussakin, 1967, Cassidinopsis emarginata (Guérin-Méneville, 1843) and Moruloidea

  15. The Miocene Cyprideis species flock (Ostracoda; Crustacea) of western Amazonia (Solimões Formation)

    Science.gov (United States)

    Gross, Martin; Ramos, Maria Ines F.; Piller, Werner E.

    2015-04-01

    The Miocene mega-wetland of western Amazonia holds a diverse, largely endemic aquatic invertebrate fauna (e.g., molluscs, ostracods). Among ostracods, the genus Cyprideis experienced a remarkable radiation. Micropalaeontologic investigations of a 400-m-long sediment core (~62 km SW Benjamin Constant, Amazonia, Brazil) permitted a taxonomic revision of about two-thirds of hitherto described Cyprideis species. Ostracod index species enabled a biostratigraphic allocation of the well succession to the Cyprideis minipunctata to Cyprideis cyrtoma biozones (late middle to early late Miocene age). The current study underlines once more Cyprideis' remarkable capability to produce species flocks and western Amazonian Cyprideis comply with the criteria of a species flock: i) endemicity: up to now not a single species is recorded in adjacent areas; ii) monophyly: although hardly verifiable to date and probably Amazonian Cyprideis is not monophyletic s.str., several closely related, quite rapidly evolving species are proved; iii) speciosity: due to the present study, 30 formally described species exist; several further species, left in open nomenclature, are recorded in the literature, which strongly hints to a much higher, still unrecorded species richness; iv) ecological diversity: based on rare sedimentologic cross-references, ecological diversity within a highly structured wetland is possible; the current results demonstrate the sympatric occurrence of up to 12 Cyprideis species, which may indicate adaptations to different microhabitats; v) habitat dominance: regularly Cyprideis holds more than >90 % in western Amazonian ostracod assemblages during the early and middle Miocene. Explanations for this extreme habitat monopolisation are still arguable and touch the highly disputed question about the nature of western Amazonia's environments during the Miocene. It seems, however, evident that a strictly actualistic approach to endemic Neogene Amazonian biota is highly problematic. This study was funded by Austrian Science Fund (FWF project P21748-N21).

  16. Eight new species of the genus Sinopotamon from Jiangxi Province, China (Crustacea, Decapoda, Brachyura, Potamidae)

    NARCIS (Netherlands)

    Ai-Yun, Dai; Xian-Min, Zhou; Wei-Dong, Peng

    1995-01-01

    Fifteen species of freshwater crabs belonging to the genus Sinopotamon are recorded from Jiangxi Province, S.E. China. Eight species are new to science and these are described: S. xiushuiense, S. jiujiangense, S. wanzaiense, S. anyuanense, S. siguqiaoense, S. linhuanense, S. yushanense and S

  17. Genetic population structure of an anchialine shrimp, Metabetaeus lohena (Crustacea: Alpheidae, in the Hawaiian Islands

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    Atlantis Russ

    2010-03-01

    Full Text Available Anchialine habitats in the Hawaiian Islands, characterized as coastal bodies of land-locked salt or brackish water that fluctuate with the tides due to subterranean connections, are the only ecosystems of this type found within the United States. These habitats are currently subject to anthropogenic impacts tha t threaten their future existence. Previous research has shown strong genetic population structure of an endemic atyid shrimp, Halocaridina rubra, in these habitats. The native alpheid shrimp, Metabetaeus lohena, whose known range entirely overlaps that of H. rubra, has feeding and reproductive behaviors that are biologically distinct from H. rubra. Its historic scarcity and status as a candidate for the US Fish and Wildlife Department’s Endangered Species List, make M. lohena an ideal species to compare against the known genetic structure of H. rubra. We investigated the population structure of this native anchialine shrimp to test the hypothesis that genetic population structure differs between the two shrimp species and that M. lohena is genetically unstructured across its range. A survey of 605 bp of the mitochondrial cytochrome c oxidase subunit I (COI gene from 127 individuals collected at 7 sites spanning the islands of O’ahu, Maui and Hawaii revealed 43 haplotypes. The most common haplotype was represented in similar proportions from all sites sampled, accounting for 44% of the surveyed sequences. Analyses of molecular variation (AMOVA, pairwise ΦST values, Bayesian estimates of migration (M, Mantel tests and Nested Clade Analyses (NCAs all failed to reveal evidence of major barriers to gene flow among most populations separated by inter-island channels. This lack of genetic structure in M. lohena is found to be in stark contrast with the highly structured population of H. rubra, and may be attributed to oceanic dispersal strategies and/or a recent introduction to the Hawaiian Islands. Rev. Biol. Trop. 58 (1: 159-170. Epub 2010 March 01.Los hábitats de los alfeidos de las islas de Hawaii, se caracterizan por ser zonas cerradas de aguas saladas o salobres, que fluctúan con las mareas, debido a las conexiones subterráneas, son los únicos ecosistemas de este tipo que se encuentran en Estados Unidos. Estos hábitats actualmente están sujetos a impactos antropogénicos que amenazan su existencia futura. La investigación anterior ha demostrado una fuerte estructura genética de una población de camarones atíidos endémicos, Halocaridina rubra, en estos hábitats. El camarón alfeido nativo, Metabetaeus lohena, cuya área de distribución conocida se superpone totalmente con la de H. rubra, tiene comportamientos alimenticios y reproductivos que son biológicamente diferentes a los de H. rubra. Su escasez histórica y su condición de candidato para aparecer en la Lista de Especies en Peligro del Departamento de Pesca y Vida Silvestre de Estados Unidos, hace de M. lohena una especie ideal para comparar su estructura genética con la de H. rubra. Se investigó la estructura de la población de este camarón alfeido nativo para probar la hipótesis que la estructura genética de la población difiere entre las dos especies y que la de M. lohena está genéticamente no estructurada en todo su ámbito. El análisis de 605 pb de la oxidasa mitocondrial citocromo c subunidad I (COI de genes de 127 individuos recolectados en 7 sitios que abarcan las islas de Oahu, Maui y Hawaii reveló 43 haplotipos. El haplotipo más común fue representado en proporciones similares en todos los sitios incluidos en la muestra, de acuerdo al 44% de las secuencias estudiadas. El análisis de variación molecular (AMOVA, los valores de ΦST pareados, la estimación bayesiana de la migración (M, las pruebas de Mantel y los Análisis Cladísticos no pudieron revelar la existencia de importantes barreras al flujo genético entre las poblaciones más separadas por los canales entre las islas. La falta de estructura genética en M. lohena contrasta con la muy estructurada población de H. rubra, y puede ser atribuida a las estrategias de dispersión oceánica y/o una introducción reciente en las islas hawaianas.

  18. Species and hybrids in the genus Diaphanosoma Fischer, 1850 (Crustacea: Branchiopoda: Cladocera).

    Science.gov (United States)

    Liu, Ping; Xu, Lei; Xu, Shao-Lin; Martínez, Alejandro; Chen, Hua; Cheng, Dan; Dumont, Henri J; Han, Bo-Ping; Fontaneto, Diego

    2018-01-01

    Cladocerans are well-studied planktonic crustaceans, especially those of the genus Daphnia in which interesting evolutionary questions have been addressed on speciation processes. The aim of the present study is to demonstrate that other genera of cladocerans show similar levels of cryptic diversity, intraspecific gene flow, and thus become useful model systems for comparison. In order to do so, we chose the genus Diaphanosoma, widespread in tropical and temperate areas. We started with a survey of species diversity in the genus Diaphanosoma in Asia using a morphological approach, then obtained sequences from a mitochondrial and a nuclear marker from multiple individuals of different species, performed tests on DNA taxonomy and molecular phylogenies, and assessed the role of hybridization in explaining the cases of mitonuclear discordance. The results are that cryptic diversity occurs in Diaphanosoma, and mitonuclear discordance was found in about 6% of the sequenced animals. Past hybridization is supported as the most likely explanation for the discordance: no evidence was found of first generation hybrids with heterozygous sequences. Our analysis on patterns of genetic diversity in Diaphanosoma supports similarities and differences with what is known in Daphnia. Copyright © 2017 Elsevier Inc. All rights reserved.

  19. Comparative mitogenomic analyses of three North American stygobiont amphipods of the genus Stygobromus (Crustacea: Amphipoda)

    Science.gov (United States)

    Aunins, Aaron W.; Nelms, David L.; Hobson, Christopher S.; King, Timothy L.

    2016-01-01

    The mitochondrial genomes of three North American stygobiont amphipods Stygobromus tenuis potomacus, S. foliatus and S. indentatus collected from Caroline County, VA, were sequenced using a shotgun sequencing approach on an Illumina NextSeq500 (Illumina Inc., San Diego, CA). All three mitogenomes displayed 13 protein-coding genes, 22 tRNAs and two rRNAs typical of metazoans. While S. tenuis and S. indentatusdisplayed identical gene orders similar to the pancrustacean ground pattern, S. foliatus displayed a transposition of the trnL2-cox2 genes to after atp8-atp6. In addition, a short atp8 gene, longer rrnL gene and large inverted repeat within the Control Region distinguished S. foliatus from S. tenuis potomacus and S. indentatus. Overall, it appears that gene order varies considerably among amphipods, and the addition of these Stygobromus mitogenomes to the existing sequenced amphipod mitogenomes will prove useful for characterizing evolutionary relationships among various amphipod taxa, as well as investigations of the evolutionary dynamics of the mitogenome in general.

  20. Studies on planktonic decapoda and stomatopoda (Crustacea) from the Arabian Sea

    Digital Repository Service at National Institute of Oceanography (India)

    Paulinose, V.T.; Goswami, S.C.; Nair, V.R.

    and longitudes 66 degrees 00' and 78 degrees 00'E and depths ranging from 25 to 500 m. Only 40 samples out of 93, contained planktonic decapods and stomatopods. Maximum number of larvae (1501/100 m3) was obtained from Station 228 (Ga. Cr. 13), a very shallow...

  1. Review of the fish-parasitic genus Cymothoa Fabricius, 1793 (Crustacea: Isopoda: Cymothoidae) from Australia.

    Science.gov (United States)

    Martin, Melissa B; Bruce, Niel L; Nowak, Barbara F

    2016-06-03

    The genus Cymothoa Fabricius, 1793 is revised for Australian waters. Cymothoa hermani Hadfield, Bruce & Smit, 2011, previously known from Tanzania on the host Selar crumenophthalmus (Bloch, 1793) is new to Australian waters. Cymothoa carangi Avdeev, 1979; Cymothoa epimerica Avdeev, 1979; Cymothoa parupenei Avdeev, 1979; Cymothoa propria Avdeev, 1979; Cymothoa rotunda Avdeev, 1979 and Cymothoa pulchrum Lanchester, 1902 are redescribed. Cymothoa curta Schioedte & Meinert, 1884, first described from the host Anableps anableps (Linnaeus, 1758); and Cymothoa plebeia Schioedte & Meinert, 1884, first described from Cape Verde; are redescribed and excluded from the Australian fauna. Cymothoa limbata Schioedte & Meinert, 1884 is placed into junior synonymy with Cymothoa eremita (Brünnich, 1783). A key to the Australian species of Cymothoa is presented.

  2. Cladocera (Crustacea: Branchiopoda of South East Asia: history of exploration, taxon richness and notes on zoogeography

    Directory of Open Access Journals (Sweden)

    Nikolai M. Korovchinsky

    2013-08-01

    Full Text Available The history of Cladocera studies in South-East Asia is reviewed, beginning from the early start of explorations in the end of the 19th century by J. Richard and T. Stingelin. In the first half of the 20th century, extensive research was carried out by V. Brehm, who investigated material collected by the Wallacea-Expedition and the Deutschen Limnologischen Sunda-Expedition. Later, in the 1970-1980s, C.H. Fernando and collaborators, besides a few other researchers, provided a new series of regional studies of the cladoceran faunas together with the systematic revisions of some taxa from tropical Asia. Then and up to present, investigations of the Cladocera have concentrated in Thailand and many species have been revised and described as new to science. In total, 298 taxa of species rank have been recorded in SE Asia but only comparatively few of them (67 taxa; 22.5% can be regarded good species, of which the valid status has been confirmed by recent studies, while others are synonyms (68; 22.8% or taxa of uncertain taxonomic status, including those which definitely represent complexes of species (163; 54.7%. Most total taxa of species level and good species are known from Thailand (155 and 54, respectively, followed by Malaysia (plus Singapore, Indonesia, Philippines, Vietnam, and Cambodia in this respect (70-119 total taxa and 23-33 good species respectively. Laos, Burma (Myanmar and Brunei remain practically unexplored. Only good species were used for the zoogeographic analysis. Of them, about a quarter is known only in SE Asia but more species are distributed in tropical/subtropical/temperate Asia and Australia, others in tropics/subtropics of the eastern hemisphere (17.9% or even wider. Tropical species, constituting the primary part of the cladoceran fauna of SE Asia, can penetrate the neighboring subtropical and southern temperate zones to a different degree. Only a small fraction of species (7 or 10.5% here are of more or less northern origin, the are distributed predominantly in the subtropical/southern temperate or in the northern boreal latitudes. Few species are suggested to penetrate SE Asia from the north using the Mekong river and its tributaries. Generally, the cladocerans of SE Asia are poorly known and only continuous extensive taxonomic studies would improve this situation.

  3. A new species of Hyalella (Crustacea, Amphipoda, Dogielinotidae) from the Atlantic Forest of Misiones, Argentina

    Science.gov (United States)

    Colla, María Florencia; César, Inés Irma

    2015-01-01

    Abstract The freshwater genus Hyalella Smith, 1874 has a distribution restricted to the Western Hemisphere with most species being found in South America. In this report we describe a new species of Hyalella from the Atlantic Forest of the Misiones province, Argentina. PMID:25685030

  4. Population biology of the crab Armases angustipes (Crustacea, Decapoda, Sesarmidae at Brazilian tropical coast

    Directory of Open Access Journals (Sweden)

    Marina de Sá Leitão C. de Araújo

    2014-06-01

    Full Text Available The semi terrestrial crabs are important elements of the fauna of coastal regions. The aim of this study was to analyze the population structure of Armases angustipes (Dana, 1852 at estuaries of the Ariquindá River, considered a non impacted area, and Mamucabas River, considered a few impacted area, on the south coast of state of Pernambuco, Brazil. The species occurred in all months of the year. The number of individuals per month varied, being higher in the months of transition between the seasons. This is probably due to significant seasonal variations of air and burrow temperature and burrow salinity. There was no sexual dimorphism in size of A. angustipes in the mangrove of Ariquindá River, but males were larger than females in the mangrove of Mamucabas River. In both estuaries, the sex ratio did not differ from Mendelian proportion, but showed a deviation for females. The analysis of temporal variation in sex ratio showed significant differences in some months of the year. These variations are due to cyclical events that act distinctly on each sex. In both estuaries, size classes of carapace width were equally represented by both sexes. The ovigerous females of A. angustipes occurred only in some months of the year, especially in summer, in both estuaries. Probably the high phytoplankton productivity observed in summer favors the reproductive activity, since these algae serve as food for the larvae. Specimens of the population of Rio Ariquindá are largest and wider than those of Mamucabas River. This fact, associated with the low abundance of crabs and the lower frequency of ovigerous females observed in Mamucabas River, is an indication that this population may be influenced by the environmental impacts that this estuary has received.

  5. Declining soil Crustacea in a World Heritage Site caused by land nemertean.

    Science.gov (United States)

    Shinobe, Shotaro; Uchida, Shota; Mori, Hideaki; Okochi, Isamu; Chiba, Satoshi

    2017-09-29

    Invasive non-native species are of great concern throughout the world. Potential severity of the impacts of non-native species is assessed for effective conservation managements. However, such risk assessment is often difficult, and underestimating possible harm can cause substantial issues. Here, we document catastrophic decline of a soil ecosystem in the Ogasawara Islands, a UNESCO World Heritage site, due to predation by non-native land nemertine Geonemertes pelaensis of which harm has been previously unnoticed. This nemertine is widely distributed in tropical regions, and no study has shown that it feeds on arthropods. However, we experimentally confirmed that G. pelaensis predates various arthropod groups. Soil fauna of Ogasawara was originally dominated by isopods and amphipods, but our surveys in the southern parts of Hahajima Island showed that these became extremely scarce in the areas invaded by G. pelaensis. Carnivorous arthropods decreased by indirect effects of its predation. Radical decline of soil arthropods since the 1980s on Chichijima Island was also caused by G. pelaensis and was first recorded in 1981. Thus, the soil ecosystem was already seriously damaged in Ogasawara by the nemertine. The present findings raise an issue and limitation in recognizing threats of non-native species.

  6. Identification of the molecular components of a Tigriopus californicus (Crustacea, Copepoda) circadian clock.

    Science.gov (United States)

    Nesbit, Katherine T; Christie, Andrew E

    2014-12-01

    Copepods of the genus Tigriopus have been proposed as marine models for investigations of environmental perturbation. One rapidly increasing anthropogenic stressor for intertidal organisms is light pollution. Given the sensitivity of circadian rhythms to exogenous light, the genes/proteins of a Tigriopus circadian pacemaker represent a potential system for investigating the influences of artificial light sources on circadian behavior in an intertidal species. Here, the molecular components of a putative Tigriopus californicus circadian clock were identified using publicly accessible transcriptome data; the recently deduced circadian proteins of the copepod Calanus finmarchicus were used as a reference. Transcripts encoding homologs of all commonly recognized ancestral arthropod core clock proteins were identified (i.e. CLOCK, CRYPTOCHROME 2, CYCLE, PERIOD and TIMELESS), as were ones encoding proteins likely to modulate the core clock (i.e. CASEIN KINASE II, CLOCKWORK ORANGE, DOUBLETIME, PROTEIN PHOSPHATASE 1, PROTEIN PHOSPHATASE 2A, SHAGGY, SUPERNUMERARY LIMBS and VRILLE) or to act as inputs to it (i.e. CRYPTOCHROME 1). PAR DOMAIN PROTEIN 1 was the only circadian-associated protein not identified in Tigriopus; it appears absent in Calanus too. These data represent just the third full set of molecular components for a crustacean circadian pacemaker (Daphnia pulex and C. finmarchicus previously), and only the second obtained from transcribed sequences (C. finmarchicus previously). Given Tigriopus' proposed status as a model for investigating the influences of anthropogenic stressors in the marine environment, these data provide the first suite of gene/protein targets for understanding how light pollution may influence circadian physiology and behavior in an intertidal organism. Copyright © 2014 Elsevier Inc. All rights reserved.

  7. Gaetice depressus (Crustacea, Varunidae): Species profile and its role in organic carbon and nitrogen flow

    Science.gov (United States)

    Wahyudi, A'an. J.; Wada, Shigeki; Aoki, Masakazu; Hama, Takeo

    2015-06-01

    Gaetice depressus is one of the most dominant macrozoobenthos species in boulder shores of intertidal coastal ecosystems in Japan. As recorded in previous studies, this species is also considered as having high density and biomass. Consequently, it is thought to be one of the more important species in the organic matter flow of boulder shores, especially through the food web. In this study, some taxonomic problems related to G. depressus were tackled and the autoecology and ecological processes in the intertidal ecosystem of G. depressus, such as organic matter flow, were investigated. Furthermore, in order to clarify the taxonomy description, resolve inconsistencies in the scientific name, and learn about the life history, a literature review was conducted. Seasonal changes in density, morphology pattern and population structure were determined based on the data obtained in Ebisu Island, Japan. Then, the role of G. depressus was determined by estimating the intake and emittance fluxes of organic carbon and nitrogen through ingestion and egestion process in the boulder shores of Ebisu Island. A feeding rate experiment was also conducted in order to estimate the intake flux by using the catch-release-recapture method. Meanwhile, to estimate the emittance flux, a defecation rate experiment was conducted by catching some individuals of G. depressus, and then incubating them in the laboratory. The feeding rate measured by the speed of diet consumption of G. depressus was about 12.6 mg ind-1 h-1. Considering the average density, the intake flux through the feeding process could be estimated as 25.2 mgC m-2 h-1 and 2.6 mgN m-2 h-1. On the other hand, G. depressus egested fecal pellet at the rate of 5.4 mg ind-1 h-1. The average emittance flux through the fecal pellet egesting process is estimated at 5.6 mgC m-2 h-1 and 0.7 mgN m-2 h-1. Therefore, it can be estimated that about 25% of organic matter from diet is egested as fecal pellet, which means that about 75% of the intake flux of organic carbon and nitrogen is used for the total assimilation of G. depressus. Intake flux was also considered as affecting the high dynamism of primary producer consumption. The total population of G. depressus is estimated to consume about 18.4% of primary producer in average throughout the year. Therefore, the turnover time of primary producer by consumption of G. depressus was about five days.

  8. Siphonoecetini Just, 1983 (Crustacea, Amphipoda, Ischyroceridae) 11: Cephaloecetes schioettei sp. nov. from The Philippines.

    Science.gov (United States)

    Just, Jean

    2017-05-29

    The new species described below, Cephaloecetes schioettei, is the second siphonoecetine to be recorded from the archipelago region of Indonesia, The Philippines and Papua New Guinea. The previous reports were of Borneoecetes wongi Barnard & Thomas, 1984 from Borneo and from Papua New Guinea by Myers (1995).

  9. A new species of Scandarma (Crustacea: Brachyura: Sesarmidae) from Sabah, Borneo, Malaysia.

    Science.gov (United States)

    Ng, Peter K L

    2013-01-01

    A new species of terrestrial sesarmid crab, Scandarma raymondi, is described from Sabah, Malaysia. This is the third species in the genus; others are from Taiwan, Japan and Sarawak, Borneo. The new species differs from congeners in the live coloration, proportions of the carapace and ambulatory legs and morphologies of the male abdomen, chela and male first gonopod.

  10. Pesticide resistance from historical agricultural chemical exposure in Thamnocephalus platyurus (Crustacea: Anostraca)

    Energy Technology Data Exchange (ETDEWEB)

    Brausch, John M. [Institute of Environmental and Human Health, Department of Environmental Toxicology, Texas Tech University, 1207 Gilbert Dr, Lubbock, TX 79416 (United States)], E-mail: john.brausch@ttu.edu; Smith, Philip N. [Institute of Environmental and Human Health, Department of Environmental Toxicology, Texas Tech University, 1207 Gilbert Dr, Lubbock, TX 79416 (United States)

    2009-02-15

    Extensive pesticide usage in modern agriculture represents a considerable anthropogenic stressor to freshwater ecosystems throughout the United States. Acute toxicity of three of the most commonly used agricultural pesticides (Methyl Parathion 4ec, Tempo SC Ultra, Karmex DF, and DDT) was determined in two different wild-caught strains of the fairy shrimp Thamnocephalus platyurus. Fairy shrimp collected from playas surrounded by native grasslands were between 200% and 400% more sensitive than fairy shrimp derived from playas in agricultural watersheds for Methyl Parathion 4ec, Tempo SC Ultra, and Karmex DF, likely due to the development of resistance. Additionally, reduced sensitivity to DDT was observed among fairy shrimp from agriculturally-impacted playas as compared to those from native grassland-dominated playas. These data suggest that fairy shrimp inhabiting playas in agricultural regions have developed some degree of resistance to a variety of agrochemicals in response to historical usage. - This manuscript discusses the potential effects of long-term pesticide usage on the development of resistance and cross-resistance on a non-target aquatic invertebrate.

  11. Dusk but not dawn burrow emergence rhythms of Nephrops norvegicus (Crustacea: Decapoda

    Directory of Open Access Journals (Sweden)

    Valerio Sbragaglia

    2013-10-01

    Full Text Available The Norway lobster, Nephrops norvegicus, can be captured by haul nets only during the emergence from its burrow. In the last few decades, an extensive field research revealed distinct diel (24-h–based catchability patterns at different depths. Laboratory experiments suggested that burrow emergence (used as a proxy of catchability is endogenously controlled via a circadian system. Results were usually presented in terms of mean effects without a quantification of inter-individual variability and arrhythmia. Here, we studied the burrow emergence of 52 adult Nephrops by an infrared actograph endowed with an artificial burrow. Animals were exposed to 12-12 h light-darkness cycle, simulating photic condition of the lower shelf. Forty-five animals showed rhythmic emergence (87%, while seven were arrhythmic (13%. Rhythmic animals were clustered according to their timing of emergence: 54% at dusk and 4% at dawn. Moreover, other animals showed fully diurnal or nocturnal emergence (10% and 19%, respectively. The comparison of our results with those derived from temporally scheduled trawling indicates that bimodal catch patterns observed in shelf populations are poorly observed during individual experiments in the laboratory, where the same light conditions are simulated. Nephrops burrow emergence seems to be the result of a mixed endogenous-exogenous control, while arrhythmia could also be present in the wild.

  12. A review of Strobopagurus Lemaitre, 1989 (Crustacea, Decapoda, Paguroidea, Parapaguridae, with description of a new species

    Directory of Open Access Journals (Sweden)

    Rafael Lemaitre

    2004-09-01

    Full Text Available Species of the parapagurid genus Strobopagurus Lemaitre, 1989 are reviewed based primarily on abundant specimens obtained during French campaigns across the Indo-Pacific region. A new species, S.breviacus, is described. The genus contains two other species, S. gracilipes (A. Milne-Edwards, 1891, the type of the genus, and S.sibogae (de Saint Laurent, 1972. One taxon, Parapagurus kilburni Kensley, 1973, originally described from off eastern Africa, has been found to be a junior synonym of S.sibogae. An updated diagnosis of the genus, and diagnoses and comparative illustrations of all three species, are presented together with a key to aid in their identification. Information on live coloration is provided for S.gracilipes and S. sibogae; live coloration of S. breviacus is not known.

  13. Morphological and molecular affinities of two East Asian species of Stenhelia (Crustacea, Copepoda, Harpacticoida

    Directory of Open Access Journals (Sweden)

    Tomislav Karanovic

    2014-05-01

    Full Text Available Definition of monophyletic supraspecific units in the harpacticoid subfamily Stenheliinae Brady, 1880 has been considered problematic and hindered by the lack of molecular or morphology based phylogenies, as well as by incomplete original descriptions of many species. Presence of a modified seta on the fifth leg endopod has been suggested recently as a synapomorphy of eight species comprising the redefined genus Stenhelia Boeck, 1865, although its presence was not known in S. pubescens Chislenko, 1978. We redescribe this species in detail here, based on our freshly collected topotypes from the Russian Far East. The other species redescribed in this paper was collected from the southern coast of South Korea and identified as the Chinese S. taiae Mu & Huys, 2002, which represents its second record ever and the first one in Korea. A fragment of the mtCOI gene was successfully PCR-amplified from two specimens of each species, which represents the first molecular data for this genus, and from additional 19 specimens belonging to six different species of other stenheliins from Korea and Russia. Reconstructed phylogenies confirm previously postulated monophyly of Stenhelia and polyphyly of the closely related genus Delavalia Brady, 1869. Average pairwise maximum likelihood distances between S. pubescens and S. taiae are only slightly above 10%, suggesting a very close relationship despite numerous newly discovered micro-morphological differences and despite macro-morphological similarities being probable plesiomorphies.

  14. A new species of Cymadusa Savigny, 1816 (Crustacea: Amphipoda: Ampithoidae from northeastern Brazil

    Directory of Open Access Journals (Sweden)

    Luiz F. Andrade

    Full Text Available A new species of the amphipod family Ampithoidae Stebbing, 1899 is described from the northeastern Brazilian waters. The new described taxon is grouped in the genus Cymadusa Savigny, 1816, since it presents all the diagnostic characteristics of the genus. The examined material was collected by scuba diving in the Rocas Atoll, off Rio Grande do Norte state coast, Camamu Bay and Todos os Santos Bay, Bahia state. The new species described here is close to C. filosa Savigny, 1816, type species of the genus, by presenting anterior margin of gnathopod 1 poorly setose, male gnathopod 2 densely setose, with palmar corner not defined by a spine and dactylus subequal in length to palm, being considered part of the C. filosa complex. Among the species of this complex, the one which most resembles to the new taxon is C. imbroglio Rabindranath, 1972, which is distinguished by the absence of both the trapezoid process in the palm and spine at the palmar corner in the gnathopod 2. This is the second species of the genus Cymadusa recorded from Brazilian waters.

  15. Long-term Hg pollution induced Hg tolerance in the terrestrial isopod Porcellio scaber (Isopoda, Crustacea)

    Energy Technology Data Exchange (ETDEWEB)

    Lapanje, A. [University of Ljubljana, Biotechnical Faculty, Department of Biology, Vecna pot 111, 1000 Ljubljana (Slovenia); Institute of Physical Biology, Veliko Mlacevo 59, 1290 Grosuplje (Slovenia)], E-mail: ales.lapanje@bf.uni-lj.si; Drobne, D. [University of Ljubljana, Biotechnical Faculty, Department of Biology, Vecna pot 111, 1000 Ljubljana (Slovenia); Nolde, N. [Institute Jozef Stefan, Department of Environmental Sciences, Jamova 39, 1000 Ljubljana (Slovenia); Valant, J. [University of Ljubljana, Biotechnical Faculty, Department of Biology, Vecna pot 111, 1000 Ljubljana (Slovenia); Muscet, B. [Institute of Physical Biology, Veliko Mlacevo 59, 1290 Grosuplje (Slovenia); Leser, V. [University of Ljubljana, Biotechnical Faculty, Department of Biology, Vecna pot 111, 1000 Ljubljana (Slovenia); Rupnik, M. [Institute of Public Health, Prvomajska 1, 2000 Maribor (Slovenia); Faculty of Medicine, University of Maribor, Slomskov trg 15, 2000 Maribor (Slovenia)

    2008-06-15

    The aim of our work was to assess the pollution-induced community tolerance (PICT) of isopod gut microbiota and pollution-induced isopod population tolerance (PIPT). Animals collected from a chronically Hg polluted and an unpolluted location were exposed for 14 days to 10 {mu}g Hg/g dry food under laboratory conditions. The lysosomal membrane stability, hepatopancreas epithelium thickness, feeding activity and animal bacterial gut microbiota composition were determined. The results confirm the hypothesis that the response to short-term Hg exposure differs for animals from the Hg polluted and the unpolluted field locations. The animals and their gut microbiota from the Hg polluted location were less affected by Hg in a short-term feeding experiment than those from the unpolluted environment. We discuss the pollution-induced population tolerance of isopods and their gut microbiota as a measure of effects of long-term environmental pollution. The ecological consequences of such phenomena are also discussed. - Isopods (Porcellio scaber) as well as their bacterial gut community from a mercury-polluted site are mercury tolerant.

  16. The unusual floatation collar around nauplii of certain parasitic barnacles (Crustacea: Cirripedia: Rhizocephala)

    DEFF Research Database (Denmark)

    Høeg, Jens Thorvald; Møller, Ole Sten; Rybakov, Alexey V.

    2004-01-01

    Nauplii of the rhizocephalan families Peltogastridae and Lernaeodiscidae carry a torus-shaped collar around the body. It consists of an exceedingly thin cuticle connected to the general body cuticle along a continuous narrow ridge. In nauplii of some species, the collar is very large and its surf...

  17. The Effect of Water Temperature on Argulus foliaceus L. 1758 (Crustacea; Branchiura on Different Fish Species

    Directory of Open Access Journals (Sweden)

    Mustafa KOYUN

    2011-05-01

    Full Text Available Parasites belonging to Argulus genus, known as fish louse (Argulus foliaceus L. significantly affect in negative way both in natural and farming environment. In this study, the pathogenic effect of fish louse temperature on fish depending on water was investigated. In this research to estimate the effects of several factors such as water temperature, gender of the fish and the infection of fish louse were studied through Poisson regression method. As fish species, Alburnus alburnus (bleak, Carassius carassius (crucian carp and Carassius auratus (golden carp were caught periodically, starting from May during the year, and the parasites were counted. The gender and metrical measures of the examined fish were categorized separately. The degrees of water temperature of the dam were measured. Results from Poisson regression analysis showed that fish louse has harmful effect on the mentioned fish, depending on the water temperature.

  18. A new genus and species of axiid shrimp (Crustacea, Decapoda from a southwestern Indian Ocean seamount

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    Peter C. Dworschak

    2016-09-01

    Full Text Available A new genus and species of axiid shrimp, Montanaxius mediumquod gen. et sp. nov., is described and illustrated based on three specimens collected from hexactinellid sponges from a seamount in the southwest Indian Ocean. The new genus is characterized by a laterally denticulate rostrum, short lateral carina, absence of submedian carina, a prominent toothed median carina, round pleomere pleura 2–5, pleurobranchs on second to fourth pereopods, and the presence of a male first pleopod and appendix interna on pleopods 3–5. It most closely resembles Levantocaris Galil & Clark, 1993 and Planaxius Komai & Tachikawa, 2008, but differs from the former by being gonochoristic, having a strongly elevated gastric region and well-developed eyes, and from the latter by its toothed median carina and the presence of a median telson spine.

  19. The Ostracoda (Crustacea) of the Tina Menor estuary (Cantabria, southern Bay of Biscay): Distribution and ecology

    Science.gov (United States)

    Martínez-García, Blanca; Pascual, Ana; Rodríguez-Lázaro, Julio; Martín-Rubio, Maite; Rofes, Juan

    2013-10-01

    Recent ostracods from the Tina Menor estuary (northern Spain, southern Bay of Biscay) have been analysed. Twenty-five species have been identified for the first time, 20 with living individuals during the sampling period. The most abundant species are Leptocythere castanea, Leptocythere porcellanea, Loxoconcha elliptica, Cytherois fischeri, and Hemicytherura hoskini, Leptocythere psammophila and Semicytherura aff. angulata. These species are grouped into four assemblages defining different environments: muddy inner estuary with euryhaline species (L. elliptica); middle estuary with silty sand flats and low marsh environments (L. castanea, L. porcellanea and C. fischeri); sandy outer estuary with marine characteristics (H. hoskini, S. aff. angulata, Leptocythere baltica and L. psammophila); and littoral to inner shelf environment (Caudites calceolatus, H. hoskini and Callistocythere murrayi). In the middle estuary, L. castanea also delimits sandy-silty low marshes, and L. porcellanea and C. fischeri the vegetated ecosystems. Multivariate analyses with the samples and species (cluster Q-type and detrended and canonical correspondence analysis) confirm that ostracod distribution in the Tina Menor estuary is controlled by sediment grain size and by the distance to the mouth of the estuary (associated to salinity). The geographical height in relation with mean tide levels (and therefore with emersion periods) also plays an important role in distribution. The results of this study confirm ostracod validity as tide-level markers due to the presence of C. fischeri below the MHWNT (mean high water neap tide), whereas L. castanea and L. porcellanea are present between the MHWNT and MHW (mean high water) levels. Ostracods can also indicate environmental changes due to human-influenced processes. Abundant individuals of L. elliptica in some areas of the middle estuary evidence discharges of lower-salinity water from a nearby fish farm. Ostracods from the marine shelf reach the inner estuary, but continental species are not provided by the rivers. The low river influence may be due to Nansa River flow regulation upstream, which hampers the transport of fluvial sediments, resulting in an increase in sand in the mudflat and low marshes, the latter fact confirmed by the numbers of L. castanea and L. porcellanea, much higher than in other estuaries in the southern Bay of Biscay.

  20. Pseudorchomene boreoplebs, a new lysianassid amphipod from Korean waters (Crustacea, Amphipda, Lysianassoidea

    Directory of Open Access Journals (Sweden)

    Tae Won Jung

    2017-11-01

    Full Text Available Until now, the genus Pseudorchomene Schellenberg, 1926 has been recorded exclusively in Antarctic or sub-Antarctic regions. Pseudorchomene boreoplebs sp. n., described from Korean waters, is the first record from the Northern Hemisphere as well as from temperate regions. This new species is very similar to Pseudorchomene plebs (Hurley, 1965, but can be readily distinguished by its wider basis of gnathopod 1, elongate carpus and angulate anterodistal corner of the propodus on gnathopod 2, having slender setae only on the posterior margin of the carpus on pereopod 5, and lacking posterior lobations of the carpus on pereopods 5–7.

  1. Two new species of Urothoe (Crustacea, Amphipoda, Gammaridea From The East Johor Islands Archipelago, Malaysia

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    Azman Abdul Rahim

    2011-03-01

    Full Text Available Two new species of urothoid amphipods from Pulau Sibu and Pulau Tinggi, Johor are described and illustrated. The specimens of Urothoe sibuensis new species were collected by vertical haul plankton net and is distinctively different from other existing Urothoe species by these combination of special characters; similar gnathopods 1–2 with short and stout propodus expanded into poorly defined palms; large eyes and epimeron 3 smooth. Urothoe tinggiensis new species as collected using an airlift suction sampler at seagrass area is characterized by its different gnathopodal configuration with setose dactylus of 5th pereopod; eyes minute; carpus is wider than merus in the 5th pereopod; subquadrate coxa 4; merus and carpus of pereopods 6–7 are linear.

  2. A new species of Hyalella from the Andes in Perú (Crustacea: Amphipoda: Hyalellidae).

    Science.gov (United States)

    González, Exequiel R; Watling, Les

    2002-06-01

    Hyalella pauperocavae n. sp. from Huancayo, Perú, is described. Five other epigean freshwater amphipods have been described from Peru (excluding Lake Titicaca), but the lack of type material and poor descriptions do not allow the assignment of the species described here to any of the names known for the area.

  3. A new species of Hyalella from the Andes in Perú (Crustacea: Amphipoda: Hyalellidae

    Directory of Open Access Journals (Sweden)

    Exequiel R González

    2002-06-01

    Full Text Available Hyalella pauperocavae n. sp. from Huancayo, Perú, is described. Five other epigean freshwater amphipods have been described from Peru (excluding Lake Titicaca, but the lack of type material and poor descriptions do not allow the assignment of the species described here to any of the names known for the areaSe describe la especie Hyalella pauperocavae n. sp. recolectada en la localidad de Huancayo, Perú. Otras cinco especies de anfípodos epígeos se conocen para el Perú (excluyendo aquellas presentes en el Lago Titicaca. La ausencia de material tipo y descripciones poco claras impidieron la asignación de la especie descrita aquí a alguno de los nombres conocidos para el área

  4. Morphometric differences in two calanoid sibling species, Boeckella gracilipes and B. titicacae (Crustacea, Copepoda

    Directory of Open Access Journals (Sweden)

    Patricio De los Ríos Escalante

    2012-12-01

    Full Text Available Calanoid copepods are abundant in South American inland waters and include widespread species, such as Boeckella gracilipes (Daday, 1902, which occurs from the Ecuador to Tierra del Fuego Island. This species occurs under various environmental conditions, and is found in oligotrophic lakes in Patagonia (39-54°S and in shallow mountain lakes north of 39°S. The aim of the present study is to conduct a morphometric comparison of male specimens of B. titicacae collected in Titicaca and B. gracilipes collected in Riñihue lakes, with a third population of B. gracilipes collected in shallow ponds in Salar de Surire. Titicaca and Riñihue lakes are stable environments, whereas Salar de Surire is an extreme environment. These ponds present an extreme environment due to high exposure to solar radiation and high salinity levels. The results of the study revealed differences among the three populations. These results agree well with systematic descriptions in the literature on differences between the populations of Titicaca and Riñihue lakes, and population of Salar de Surire differs slightly from the other two populations. It is probable that the differences between the population of Salar de Surire and the other two populations result from the extreme environment in Salar de Surire. High exposure to solar radiation, high salinity and extreme variations in temperature enhance genetic variations that are consequently expressed in morphology.

  5. Hatching phenology and voltinism of Heterocypris barbara (Crustacea: Ostracoda from Lampedusa (Sicily, Italy

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    Valeria Rossi

    2013-04-01

    Full Text Available The persistence of crustacean populations in ephemeral ponds requires appropriate adaptations in life history strategies (e.g. in hatching phenology. Organisms take advantage of pond filling when it occurs and hedge their bets for the possibility to complete one or more life cycles or to produce resting stages that ensure that the population will not go extinct. We carried out laboratory experiments to investigate the dynamics of a sexual population of Heterocypris barbara from a vernal pool in Lampedusa Island (Sicily. Experimental organisms were obtained hydrating sediments from Aria Rossa temporary pond. Recruitment from resting eggs, voltinism, mean body size and sex ratio were observed in microcosms at different conductivities (high 2.0-2.7 mS cm-1, intermediate 1.0-1.1 mS cm-1 and low 0.5-0.6 mS cm-1. Microcosms were kept in laboratory controlled conditions: constant (24°C 12:12 L:D and 16°C 10:14 L:D photoperiod or fluctuating thermal regimes. The experiment lasted 7 months. Resting and non-resting egg production and up to a bivoltine life cycle were observed. Recruitment events from egg bank and voltinism varied by thermal regime and conductivity. A prolonged recruitment phase occurred in conditions that could be considered a proxy of a rainy season (16°C, 10:14 L:D and low conductivity or of long hydroperiods (spring thermal fluctuating regime and intermediate conductivity. At 24°C, age at reproduction of females from resting eggs almost doubled at low conductivity (in comparison with high conductivity. Low conductivity also reduced hatching time of resting eggs while it increased development time and age at maturity. In thermal fluctuating regime, degree-days to reproduction were about double than at constant 24°C. Males, observed in all microcosms, reached maturity faster and had a shorter life span than females. Males initially outnumbered females, but later in the experiments females became dominant. We also evaluated the effect of conductivity and thermal regimes on other traits like recruitment from egg bank, voltinism and sex ratio. We discuss whether our observations on a small population from temporary pools could be considered part of a diversified bet-hedging strategy.

  6. Checklist of copepods (Crustacea: Calanoida, Cyclopoida,Harpacticoida) from Wyoming, USA, with new state records

    Science.gov (United States)

    Presentation of a comprehensive checklist of the copepod fauna of Wyoming, USA with 41 species of copepods; based on museum specimens, literature reviews, and active surveillance. Of these species 19 were previously unknown from the state. This checklist includes species in the families Centropagida...

  7. The orientation of the Saculinidae (Crustacea Rhizocephala) in respect to their hosts

    NARCIS (Netherlands)

    Boschma, H.

    1948-01-01

    Delage (1884) and Smith (1906), two authors who published extremely important contributions on Rhizocephala, largely differed in their views concerning the morphology of these parasites. Both regarded the surface of the parasites touching the thorax of the host as the left side, but in other

  8. Origin and occurrence of sexual and mating systems in Crustacea: A ...

    Indian Academy of Sciences (India)

    2013-11-06

    Nov 6, 2013 ... found to be bilateral, and corresponded to the external second- ary sexual characteristics. Both the ovary ... females, thereby providing paternity assurance for the guarding male (Grafen and Ridley 1983). ... passed into the female's external brood chamber, where they are fertilized by the guarding male.

  9. Redescription and first records from Brazil of Diacyclops uruguayensis Kiefer (Crustacea, Copepoda, Cyclopidae

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    Janet W. Reid

    1998-01-01

    Full Text Available Diacyclops uruguayensis Kiefer, 1935 is redescribed from specimens from Santa Catarina and Ceará, Brazil. These new records represent a significant range extension from southern Uruguay.

  10. Evolutionary morphology of the hemolymph vascular system in hermit and king crabs (Crustacea: Decapoda: Anomala).

    Science.gov (United States)

    Keiler, Jonas; Richter, Stefan; Wirkner, Christian S

    2013-07-01

    The morphological transformation of hermit crabs into crab-like king crabs in the evolution of decapod crustaceans represents a remarkable case of carcinization or evolutionary shaping into a crab-like form. In this study, we focus on internal organs such as the hemolymph vascular system and adjacent anatomical structures of several Recent hermit crab (Paguridae) and king crab (Lithodidae) species. There are various correspondences in the morphology of the arterial systems in the dorsal cephalothorax of the two taxa, especially with regard to the anterior aorta, anterior lateral arteries, and hepatic arteries. In the pleon, the posterior aorta in both taxa displays a proximal bifurcation and follows an asymmetrical course. The ventral vessel system, on the other hand, which mainly supplies the limbs, differs significantly between the taxa, with pagurids displaying the plesiomorphic condition. The pattern of the ventral vessel system in Lithodidae is influenced by morphological transformations of integumental structures during carcinization. One of these transformations was the broadening of the sternites, which resulted in a widening of the space between the endosternites. In addition, changes in the morphology of the endophragmal skeleton in Lithodidae led to an increase in the potential for intraspecific variability and interspecific variation in the arterial branching pattern. Copyright © 2013 Wiley Periodicals, Inc.

  11. First Record of the Genus Paragrandidierella (Crustacea: Amphipoda: Aoridae from Korea

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    Tae Won Jung

    2013-07-01

    Full Text Available A newly recorded aorid species, Paragrandidierella minima Ariyama, 2002, from Korean waters is reported with a description and illustrations, and its generic features are considered. This species is characterized by the carpochelate gnathopod 1 in matured male, the posterodistal protrusion on peduncle 5 of antenna 2, the absence of the apical spine on inner plate of maxilliped, the minute apical projection on inner lobe of lower lip, the acute posteroproximal extension on the basis of each pereopod 5 and 6, the shape of uropods and telson, and the large inter-ramal process of uropod 1. This is the first report of the genus Paragrandidierella from Korea.

  12. First Record of a Hyalid Species, Protohyale pumila (Crustacea: Amphipoda: Hyalidae, from Korea

    Directory of Open Access Journals (Sweden)

    Myung-Hwa Shin

    2012-10-01

    Full Text Available A hyalid amphipod, Protohyale pumila (Hiwatari and Kajihara, 1981, collected from Jeju Island is reported for the first time in the Korean fauna. The species is characterized by the presence of a short apical spine on the palp article 4 of maxilliped, a distinctly large and blunt cusp on the propodus of male gnathopod 1, and a distal truncate process on the palm of male gnathopod 2. Herein, the present species is described and illustrated. Korean hyalid amphipods now are composed of four species belonging to three genera. Voucher specimens were deposited in the Marine Arthropod Depository Bank of Korea, Seoul National University.

  13. First Record of the Mysids, Genus Erythrops (Crustacea: Mysida: Mysidae from Korea

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    Mijin Kim

    2012-04-01

    Full Text Available The tribe Erythropini Hansen, 1910 belonging to the subfamily Mysinae Haworth, 1825, is one of the peculiar groups mainly found in the pelagic or deep sea. Of these, the genus Erythrops G.O. Sars, 1869 including two mysids, Erythrops minuta Hansen, 1910 and Erythrops nana W. Tattersall, 1922, is reported for the first time from Korea. The genus is easily distinguished from other genera by the antennal scale with a terminal strong spine, the carpus of third to eighth thoracopods divided into the propodus by an oblique articulation, and the trapezial telson. The morphological descriptions and the illustrations of these species are given with photographs. As a result of this study, 49 species of mysids including these two species are now recorded in the Korean fauna.

  14. Molecular phylogenetics of American snapping shrimps allied to Alpheus floridanus Kingsley, 1878 (Crustacea: Decapoda: Alpheidae).

    Science.gov (United States)

    Bracken-Grissom, Heather D; Robles, Rafael; Felder, Darryl L

    2014-12-17

    Widely distributed populations of the snapping shrimp, Alpheus floridanus Kinglsey, 1878, from the eastern Pacific and western and eastern Atlantic Ocean have long been suspected to represent different species due to extreme morphological variation among conspecifics. A companion study (Bracken-Grissom & Felder 2014) contains redescriptions of two western Atlantic species (A. floridanus Kingsley 1878 sensu stricto and A. platycheirus Boone, 1927), assignments of the original syntypes for A. floridanus, descriptions of three new species from the Atlantic and eastern Pacific (A. hephaestus Bracken-Grissom & Felder, 2014; A. roblesi Bracken-Grissom & Felder, 2014; A. ulalae Bracken-Grissom & Felder, 2014), and discussion of the relationship of the eastern Atlantic A. floridanus africanus Balss, 1916. The present study underpins all these findings by application of molecular phylogenetic techniques. Analysis of partial sequences of the 16S, 12S, and COI mitochondrial genes separate species throughout the eastern Pacific and the eastern and western Atlantic. Morphological comparisons suggested that the two syntypes of A. floridanus belong to different species, and molecular results in this study confirm this separation. Genetic data suggest a strong affinity between the western Atlantic A. platycheirus and the eastern Pacific A. hephaestus. Close relationships are evident between trans-Atlantic species, A. floridanus africanus and A. floridanus, a pattern also seen for other cryptic and pseudocryptic species of Alpheus. Alpheus roblesi and A. ulalae represent early-branching lineages within the complex. In some cases, molecular phylogenetic relationships between members of the A. floridanus complex can be reconciled with postulated biogeographic history.

  15. Molecular phylogeny of Pasiphaeidae (Crustacea, Decapoda, Caridea) reveals systematic incongruence of the current classification.

    Science.gov (United States)

    Liao, Yunshi; De Grave, Sammy; Ho, Tsz Wai; Ip, Brian H Y; Tsang, Ling Ming; Chan, Tin-Yam; Chu, Ka Hou

    2017-10-01

    Caridean shrimps constitute one of the most diverse groups of decapod crustaceans, notwithstanding their poorly resolved infraordinal relationships. One of the systematically controversial families in Caridea is the predominantly pelagic Pasiphaeidae, comprises 101 species in seven genera. Pasiphaeidae species exhibit high morphological disparity, as well as ecological niche width, inhabiting shallow to very deep waters (>4000m). The present work presents the first molecular phylogeny of the family, based on a combined dataset of six mitochondrial and nuclear gene markers (12S rDNA, 16S rDNA, histone 3, sodium-potassium ATPase α-subunit, enolase and ATP synthase β-subunit) from 33 species belonged to six genera of Pasiphaeidae with 19 species from 12 other caridean families as outgroup taxa. Maximum likelihood and Bayesian inference analyses conducted on the concatenated dataset of 2265bp suggest the family Pasiphaeidae is not monophyletic, with Psathyrocaris more closely related to other carideans than to the other five pasiphaeid genera included in this analysis. Leptochela occupies a sister position to the remaining genera and is genetically quite distant from them. At the generic level, the analysis supports the monophyly of Pasiphaea, Leptochela and Psathyrocaris, while Eupasiphae is shown to be paraphyletic, closely related to Parapasiphae and Glyphus. The present molecular result strongly implies that certain morphological characters used in the present systematic delineation within Pasiphaeidae may not be synapomorphies and the classification within the family needs to be urgently revised. Copyright © 2017 Elsevier Inc. All rights reserved.

  16. Mysids (Crustacea) from the salt pans of Mumbai, India, with a description of a new species

    Digital Repository Service at National Institute of Oceanography (India)

    Biju, A.; Panampunnayil, S.U.

    on Marine Science, University of Tokyo 256–273. Quintero C, de Roa EZ. 1973. Notas bioecologicas sobre Metamysidopsis insularis Brattegard (Crusatacea-Mysidacea) en una laguna litoral de Venezuela. Acta Biologica Venezuelica 8: 245-278. Ramamoorthy K...

  17. Descriptions of five new species of Haplostylus (Mysidaceae crustacea) from South West Australia

    Digital Repository Service at National Institute of Oceanography (India)

    Panampunnayil, S.U.

    . Grigore Antipa, 24, 79-%. Coifmann,J. (1936) Misidacei del Mar Rosso: Studies del materiale raccolto dal Prof. L. Sanzo durante la compagna idrographica della R. Nave Ammiraglio Magnagli (1923-24). R. comitato Talasso- grafico Italiano, Mem., 233...

  18. The shallow-water Asellota (Crustacea: Isopoda from the Beagle Channel: Preliminary taxonomic and zoogeographical results

    Directory of Open Access Journals (Sweden)

    Brenda Lía Doti

    2005-12-01

    Full Text Available The shallow-water Asellota from the Beagle Channel were investigated, based on material collected at four localities in 2001-2002. A total of 3,124 asellotes were sorted, and three new species and 12 new records of distribution were reported. The Paramunnidae showed the highest species diversity and abundance (11 species and 1,463 specimens. The present research raises the number of species known from the Beagle Channel to 23; of these, 16 were previously reported from the Magellan Straits, representing 69% of similarity. Based on the present results and published data, the faunistic affinities for the shallow-water Asellota was 30% between the Magellan region and the Scotia Arc, and 26% between the Magellan region and the Antarctic Peninsula.

  19. A NEW SPECIES OF Rhacodiaptomus Kiefer, 1936, FROM THE BRAZILIAN AMAZON (CRUSTACEA:COPEPODA: CALANOIDA)

    OpenAIRE

    SANTOS-SILVA,Edinaldo Nelson dos; ROBERTSON,Barbara

    1993-01-01

    A new species of Calanoid copepod, Rhacodiaptomus besti,is described from material collected in the Igarapé São Pedro, Rio Jamari, State of Rondônia, and Lago Amanã, Rio Japurá, State of Amazonas, in Western Amazonia. A detailed morphological analysis of the species was undertaken in order to provide a basis for future studies on inter and intrageneric relationships.

  20. A new species of Rhacodiaptomus Kiefer, 1936, from the Brazilian Amazon (Crustacea, Copepod, Calanoida)

    OpenAIRE

    Edinaldo Nelson Santos Silva; Barbara Ann Robertson

    1993-01-01

    Uma nova espécie de Copepoda Calanoida, Rhacodiaptomus besti,é descrita de material coletado no Igarapé São Pedro, Rio Jamari, Rondônia, e no Lago Amanã, rio Japurá, Tefé, Amazonas, na Amazônia Ocidental. Foi feita uma análise morfològica detalhada desta espécie para embasar futuros estudos de associações inter e intragenéricas.

  1. Description of two new apseudomorphan Tanaidacea (Crustacea: Malacostraca: Peracarida) from the Kochi Backwaters, India

    Digital Repository Service at National Institute of Oceanography (India)

    PandiyaRajan, R.S.; Jyothibabu, R.; Arunpandi, N.; Biju, A.

    . Résumé Deux  nouvelles  espèces  de  tanaidaceans  apseudomorphan,  Pagurapseudopsis  kochindica  et  Ctenapseudes  indiana  sont décrites comme nouvelles pour la science. Spécimens utilisées dans cette étude sont basés sur un échantillonnage  vaste...  (79  emplacements)  dans  les  Backwaters  Kochi  pendant  les  périodes  de  mousson  sud‐ouest  et  Post‐Ouest  Monsoon. Un  total  de  109  individus  de  P. kochindica  et  180  individus  de  C.  indiana  ont  été  examinés.  La  nouvelle  espèce...

  2. Mysidacea (Crustacea) from the Minicoy lagoon (Lakshadweep, India) with description of a new species of Anisomysis

    Digital Repository Service at National Institute of Oceanography (India)

    Biju, A.; Panampunnayil, S.U.; Prabhakaran, M.P.

    contribution No. 4098 6 References Bacescu M.1973. Contribution a la connaissance des Mysides benthiques de la mer Rouge. Rapports et Proc?s-Verbaux des R?unions de la Commission Internationale pour l'Exploration Scientifique de la Mer M?diterran?e. 21...

  3. Spatial distribution and general population characteristics of Pseudanchialina pusilla (Crustacea: Mysida) in the eastern Arabian Sea

    Digital Repository Service at National Institute of Oceanography (India)

    Biju, A.

    and size. The egg diameter ranged from 0.30–0.42 mm and was independent of female size. Mature individuals total body size varied from 2.6–3.2 mm and 2.5–3.3 mm in males and females, respectively. Résumé: La répartition et les caractéristiques... générales de la population de Pseudanchialina pusilla (Sars, 1883) ont été évalués sur la base des collections de zooplancton obtenues à partir de différentes enquêtes saisonnières menées en 2004-2006 dans la mer d'Arabie orientale dans le cadre d...

  4. Growth of hatchery raised banana shrimp Penaeus merguiensis (de Man) (Crustacea: Decapoda) juveniles under different salinity

    Digital Repository Service at National Institute of Oceanography (India)

    Saldanha, C.M.; Achuthankutty, C.T.

    prawn larvae in the coastal waters of Goa, Indian J Mar Sci, 15 (1986)45-47. 6 Staples D J, Ecology of juvenile and adolescent banana prawns, Penaeus merguiensis, in a mangrove estuary and adjacent off-shore area of the Gulf of Carpentaria, Aust J Mar...

  5. Distribution and abundance of mysid shrimps (Crustacea: Mysidacea) in the Northern Indian Ocean.

    Digital Repository Service at National Institute of Oceanography (India)

    Biju, A.; Jagadeesan, L.; Panampunnayil, S.U.

    March to October, appearing in swarms in June and July (Pillai 1957). Dexter (1996) reported that this species is ranked as one of the abundant species in the inter-tidal animal com- munity of open sandy beaches on the west coast of Phuket Island... saline conditions of salt pans and this ability ensures its wide distribution from seawater to almost fresh water (Biju & Panampun- nayil 2009). It usually lives in swarms/ shoals/aggre- gations and the number of individuals in a swarm varies from a few...

  6. Length and weight relationship of laboratory reared penaeid prawn Penaeus monodon (Fabricius) (Crustacea: Penaeidae)

    Digital Repository Service at National Institute of Oceanography (India)

    Saldanha, C.M.; Chatterji, A.

    A parabolic relationship was obtained while studying the length-weight relationship of the postlarvae of Penaeus monodon. The b value (multiplying constant) showed that in the laboratory reared penaeid prawns, length-weight relationship strictly...

  7. Mysids (Crustacea) from the Exclusive Economic Zone of India with description of a new species

    Digital Repository Service at National Institute of Oceanography (India)

    Biju, A.; Panampunnayil, S.U.

    environments. They play an important role in the ecological system and their role in the food chain which has been well documented (Mees et al. 1994; Moffat 1996). The works of Hansen (1910), W. Tattersall (1922), and Pillai (1973) provided much information... of India has been presented by Mathew et al. (1989). Apart from this study, no other information is available on the mysids from this area of Indian waters. The present paper deals with 27 species of mysids collected from the EEZ of India, of which one...

  8. Les Stenasellidae (Crustacea Isopoda Asellota Anophtalmes) des eaux souterraines du sultanat d’Oman

    NARCIS (Netherlands)

    Magniez, Guy J.; Stock, Jan H.

    2000-01-01

    Descriptions of four new species of Stenasellus (Aselloidea: Stenasellidae) from the underflow of temporary streams (wadis) in northern part of Oman Sultanate. S. vermeuleni n.sp. (11.2 mm or more) and S. messanai n.sp. (7.7 mm or more) are probably karstic water species, accidentally or locally

  9. Rendimiento reproductivo de hembras de Cryphiops caementarius (Crustacea: Palaemonidae mantenidas con alimento natural

    Directory of Open Access Journals (Sweden)

    Magali Bazán

    2011-07-01

    Full Text Available El objetivo del presente trabajo fue determinar el rendimiento reproductivo de hembras de C. caementarius mantenidas con alimento natural. Se empleó 24 hembras inmaduras (5,2 cm y 2,0 g, acondicionadas en ocho acuarios (45 L y alimentadas durante dos meses de acuerdo a cada tratamiento, con pota (Dosidicus sp., almeja (Semele solida, poliqueto (Pseudonereis sp. y con alimento balanceado. El rendimiento reproductivo de las hembras fue mejorado cuando se alimentó con poliqueto y pota, lográndose la maduración entre 16 y 18 días con alta fecundidad (2627 y 1377 huevos g-1 y fertilidad (2566 y 1364 larvas g-1, respectivamente.

  10. Ensayo de diferentes lecitinas en la dieta de juveniles de Penaeus vannamei (Crustacea: Decapoda

    Directory of Open Access Journals (Sweden)

    Ana Denisse Re-Araujo

    2003-09-01

    Full Text Available Para comparar diferentes niveles y calidades de lecitina se hizo un bioensayo nutricional con dietas isoenergéticas; para medir el crecimiento, la tasa de conversión alimenticia y sobrevivencia de juveniles de P. vannamei (290 mg ± 0.02. Las lecitinas experimentales fueron de calamar, lecitina liquida de soya (7%, lecitina desaceitada de soya (3.48% en combinación con aceite de pescado o lípidos neutros de calamar, en una formula parcialmente desaceitada. Las cinco dietas fueron administradas ad libitum con cuatro replicas (estanques de 15 camarones cada uno (5 x 4 x 15, durante 28 días. La mayor ganancia en peso fue (191% y FCR (1.69±0.041 fueron obtenidos con la dieta que contenía 7% de lecitina cruda de soya como única fuente de lípidos, seguida por la dieta que contenía 3.94% de lecitina desaceitada y 2.24% de aceite Menhaiden (172% y 2.03±0.054 respectivamente. Como se esperaba los resultados menos propicios fueron con la dieta que no contenía lecitina (121% y 2.42±0.129. La lecitina cruda de soya, cubrió los requerimientos de fosfolípidos y de lípidos neutrales, tanto como la dieta con lecitina desaceitada de soya con aceite de pescado o aceite de calamarThe effect of different lecithin sources and presentations on growth, food conversion ratio and survival of P. vannamei (290 mg ± 0.02 was studied. The bioassay was designed in order to compare different dietary levels and different quality of lecithin. Squid lecithin, crude soybean (7%, deoiled soybean lecithin (3.48% in combination with fish oil or squid neutral lipids, in a partially dilapidate formula. The isoenergetic diets were fed ad libitum to four replicate groups (tanks of 15 shrimps each (5 x 4 x 15, during 28 days. The result of the bioassay with the partially dilapidate formulas was; the best growth rate (191% and FCR (1.69±0.041 were obtained with the diet containing 7% of soybean crude lecithin as the unique lipid source. Followed by the diet countering 3.94% deoiled lecithin and 2.42% Menhaden oil (172% and 2.03±0.054 respectively. As expected, the worst results were obtained without the dietary lecithin 121% and 2.42±0.129. Crude soybean lecithin alone covered the phospholipid and neutral lipids requirements as well as the combination of deoiled soybean lecithin with fish or squid oil

  11. Salinalona gen. nov., an euryhaline chydorid lineage (Crustacea: Branchiopoda: Cladocera: Anomopoda from the Oriental region

    Directory of Open Access Journals (Sweden)

    Kay Van Damme

    2013-08-01

    Full Text Available Until now, a single endemic cladoceran genus was known from the Oriental region. We propose the region’s second endemic lineage of generic rank, Salinalona gen. nov., to accomodate the South East Asian Alona sarasinorum Stingelin, 1900 and the Indian A. taraporevalae Shirgur and Naik, 1977. Morphological revision shows that the external similarities with Alona Baird, 1843 or Leberis Smirnov, 1969 and Celsinotum Frey, 1991 that have been proposed in the past, are the result of convergence. The small lineage is euryhaline, even halophylic, an unusual adaptation in the order Anomopoda and particularly in the family Chydoridae. We discuss the position and adaptation of Salinalona gen. nov., such as a strongly modified hook on the first limb, based on a detailed study of populations from Maikhao peat swamp, Phuket island, Thailand. We include comparative notes on the circumtropical genus Euryalona Sars, 1901, with detailed morphology of the Asian E. orientalis (Daday, 1898. A key to all species of both genera is included.

  12. A fresh look at the higher classification of the Siphonoecetini Just, 1983 (Crustacea, Amphipoda, Ischyroceridae) 12

    DEFF Research Database (Denmark)

    Just, Jean-Jose Andre Auzimour

    2017-01-01

    With increased knowledge of the Amphipoda Siphonoecetini over the past 30 years, classification of this group of shallow water benthic amphipods is reappraised. The cerapodids and ericthonids are removed from the Siphonoecetini, and two new tribes, Cerapodini and Ericthonini, are diagnosed...

  13. Reproductive biology and adaptability of the invasive alien freshwater Amphipod Crangonyx floridanus (Crustacea: Amphipoda, Crangonyctidae).

    Science.gov (United States)

    Tojo, Koji; Tanaka, Yoshiki; Kuranishi, Ryoichi B; Kanada, Shoji

    2010-06-01

    We studied the reproductive biology and adaptability of the alien freshwater crangonyctid amphipod Crangonyx floridanus, currently inhabiting a large portion of Japan, both in the field and under controlled laboratory conditions. In the Chikuma River population of this alien amphipod, egg-bearing individuals were found throughout the year. In terms of egg maturation cycle, egg development (during embryogenesis), and egg count per ovipositional cycle, these amphipods display a very efficient reproductive system. This study also established their adaptability to a wide range of water temperatures (primarily 4-20 degrees C, however in some cases, these individuals are able to survive at up to 30 degrees C). C. floridanus's strong capacity to adapt to broad and variable environmental conditions is certainly contributing to its high rate of population increase, and rapid dispersion throughout Japan.

  14. Grooming as a secondary behavior in the shrimp Macrobrachium rosenbergii (Crustacea, Decapoda, Caridea

    Directory of Open Access Journals (Sweden)

    Lauren VanMaurik

    2014-11-01

    Full Text Available The giant freshwater prawn, Macrobrachium rosenbergii, is a large shrimp extensively used in aquaculture whose grooming behaviors were analyzed in this study. Macrobrachium rosenbergii exhibits three unique male morphotypes that differ in their behavior, morphology and physiology: small-clawed males (SM, orange-clawed males (OC and blue-clawed males (BC. The largest and most dominant males, BC males, are predicted to have significantly different grooming behaviors compared to females and the other two male morphotypes. These BC males may be too large and bulky to efficiently groom and may dedicate more time to mating and agonistic interactions than grooming behaviors. Observations were conducted to look at the prevalence of grooming behaviors in the absence and presence of conspecifics and to determine if any differences in grooming behavior exist among the sexes and male morphotypes. Significant differences in the grooming behaviors of all individuals (females and male morphotypes were found. BC males tended to have the highest grooming time budget (percent of time spent grooming while SM males had a relatively low grooming time budget. The grooming behaviors of the male morphotypes differed, indicating while these males play distinct, separate roles in the social hierarchy, they also have different grooming priorities. The conditions in which M. rosenbergii are cultured may result in increased body fouling, which may vary, depending on the grooming efficiencies and priorities of these male morphotypes. Overall, grooming behaviors were found to be a secondary behavior which only occurred when primary behaviors such as mating, feeding or fighting were not present.

  15. Chaetotaxy and setal diversity of grooming legs in species of porcelain crabs (Crustacea: Anomura: Porcellanidae

    Directory of Open Access Journals (Sweden)

    Luciane Augusto de Azevedo Ferreira

    2018-03-01

    Full Text Available Abstract The morphology of the fifth pereiopods was studied under scanning electron microscopy in ten species of porcelain crabs for chaetotaxy and setal diversity, namelly Megalobrachium pacificum, Megalobrachium roseum, Pachycheles grossimanus, Petrolisthes armatus, Petrolisthes tuberculatus, Pisidia brasiliensis, Pisidia longicornis, Polyonyx gibbesi, Porcellana platycheles and Porcellana sayana. Six setal types were identified: simple, pappose, sickle-shaped serrate, straight serrate, club-shaped and tooth-like cuspidate. Porcelain crabs can differ in the fifth pereiopod setal morphology, chaetotaxy and setal density, even among species within the same genus. The absence of sexual dimorphism of the grooming legs in porcelain crabs suggests that grooming eggs requires no particular grooming apparatus in females and that male and female are equal in grooming efficiency.

  16. Crustacea, Decapoda, Palaemonidae, Macrobrachium Bate, 1868, Sao Sebastiao Island, state of Sao Paulo, southeastern Brazil

    Directory of Open Access Journals (Sweden)

    Mantelatto, F. L.

    2010-01-01

    Full Text Available Macrobrachium is distributed globally in most biogeographical regions, and contains species with interestingmechanisms of evolution. We conducted an exhaustive survey on São Sebastião Island, the largest coastal island of the stateof São Paulo. Here we provide a list of species (M. acanthurus, M. carcinus, M. heterochirus, M. olfersi, M. potiuna togetherwith the diagnosis, distribution, and remarks on each species, and a key for their identification. We compare our findingswith available information on the genus. The high diversity of freshwater shrimps on the island is interesting in terms ofbiogeographical and evolutionary processes.

  17. Two freshwater prawns of the genus Macrobrachium (Crustacea Decapoda: Palaemonidae) from New Guinea

    NARCIS (Netherlands)

    Holthuis, L.B.

    1984-01-01

    Macrobrachium natulorum spec. nov. is described from the Wissel Lakes area, Irian Jaya (New Guinea), Indonesia. The species is closest to M. lorentzi (J. Roux, 1921). A map showing the localities where the two species were found is given.

  18. Study of biochemical biomarkers in freshwater prawn Macrobrachium borellii (Crustacea: Palaemonidae) exposed to organophosphate fenitrothion.

    Science.gov (United States)

    Lavarías, S; García, C; Crespo, R; Pedrini, N; Heras, H

    2013-10-01

    Several agrochemicals like organophosphates are extensively used to control pests in agricultural practices but they also adversely affect non-target fauna. The effect of organophosphorous fenitrothion on the prawn Macrobrachium borellii was evaluated. The 96-h LC50 was determined. Activity of superoxide dismutase, catalase, glutathione-S-transferase and lipid oxidation levels, were evaluated in the hepatopancreas from adults exposed to sublethal fenitrothion concentrations for 1, 2, 4 and 7 days. In addition, superoxide dismutase mRNA expression, acetylcholinesterase inhibition and haemocyte DNA damage were determined. The 96-h LC50 was 4.24μg/l of fenitrothion. Prawn exposed to sublethal FS concentrations showed an increase of both catalase and superoxide dismutase activities, mainly after 2 and 4 days exposure and an increase of glutathione-S-transferase activity from day 2 to day 7 while lipid oxidation levels increased mainly on day 1. Superoxide dismutase transcripts were significantly higher in fenitrothion -treated prawns, indicating an induction mechanism. Hemolymph analysis showed that while acetylcholinesterase activity decreased after 2 days, haemocytes displayed most DNA damage after 7-day exposure to fenitrothion. These results indicate that prawn enzymes are highly sensitive to fenitrothion exposure, and these biological responses in M. borellii could be valuable biomarkers to monitor organophosphorous contamination in estuarine environments. Copyright © 2013 Elsevier Inc. All rights reserved.

  19. Embryo lipoproteins and yolk lipovitellin consumption during embryogenesis in Macrobrachium borellii (Crustacea: Palaemonidae).

    Science.gov (United States)

    García, F; Cunningham, M L; Garda, H; Heras, H

    2008-11-01

    The prawn Macrobrachium borellii has lecithotrophic eggs with highly-abbreviated development. The major yolk component is lipovitellin (LV), a lipoprotein with 30% lipids (by weight). LV consumption during embryogenesis was followed by ELISA and Western blot analysis using an anti-LV polyclonal antibody. No cross-reacting proteins were observed and LV-like lipoproteins were strongly recognized by the antibody in hemolymph (vitellogenin), yolk (LV) and embryos (LVe), as determined by Western Blot analysis. LV decreased significantly along development from 9.4 to 1.1 microg/mg egg. Consumption rate of LV was slow in early embryogenesis, followed by a rapid utilization in late embryonic stages. Significant LVe amounts were still present at hatching. LV apolipoproteins were selectively degraded during embryo development, being the highest molecular weight subunit the most affected. Comparison among in vitro, in vivo and theoretical proteolysis suggested that trypsin may be involved in LV degradation during late embryogenesis. Embryo lipoprotein (HDLe) synthesis was first detected at stage 6. HDLe shared the same density, MW and subunit composition as adult hemolymph HDL(1) and did not cross-react with LV-like lipoproteins. Though expressed at low concentration, it fulfilled embryo needs for lipid transport among organs.

  20. Notes on Indo-West Pacific Crustacea Decapoda III to IX

    NARCIS (Netherlands)

    Holthuis, L.B.

    1995-01-01

    Seven short notes: (1) describing a new species of Macrobrachium from Madagascar, (2) synonymizing Chlorotocella leptorhynchus (Stimpson, 1860) with C. spinicaudus (H. Milne Edwards, 1837), (3) synonymizing Rhynchocinetes rugulosus Stimpson, 1860, with R. serratus (H. Milne Edwards, 1837), (4)

  1. Relative growth of Amazon river prawn Macrobrachium amazonicum (Heller) (Crustacea, Decapoda, Palaemonidae) in earthen ponds

    OpenAIRE

    Moraes-Riodades, Patrícia M.C.; Valenti, Wagner C.

    2002-01-01

    Some morphometric relationships in Macrobrachium amazonicum (Heller, 1862) reared in earthen ponds were studied. A total of 239 individuals were collected, sexed and sorted to juvenile or adult. Total length (Lt), post-orbital length (Lpo), carapace length (Lcp) and queliped length (Lql) were measured. The relationships Lt/Lpo, Lpo/Lcp and Lt/Lcp are the same for juveniles, males and females, indicating unchanged growth pattern during post-larval ontogenetic development. While Lt/Lpo showed i...

  2. Two new species of Urothoe (Crustacea, Amphipoda, Gammaridea) from the East Johor Islands Archipelago, Malaysia.

    Science.gov (United States)

    Azman, B A R; Melvin, C W H

    2011-03-24

    Two new species of urothoid amphipods from Pulau Sibu and Pulau Tinggi, Johor are described and illustrated. The specimens of Urothoe sibuensis new species were collected by vertical haul plankton net and is distinctively different from other existing Urothoe species by these combination of special characters; similar gnathopods 1-2 with short and stout propodus expanded into poorly defined palms; large eyes and epimeron 3 smooth. Urothoe tinggiensis new species as collected using an airlift suction sampler at seagrass area is characterized by its different gnathopodal configuration with setose dactylus of 5th pereopod; eyes minute; carpus is wider than merus in the 5th pereopod; subquadrate coxa 4; merus and carpus of pereopods 6-7 are linear.

  3. Shoaling of sergestid shrimp Acetes johni (Crustacea Decapoda: Sergestidae) associated with swarming of gammarid amphipods

    Digital Repository Service at National Institute of Oceanography (India)

    Goswami, S.C.

    zooplankton standing stock (5.81 ml.m/3). The sergestid shrimps and gammarid amphipods formed 94.7% of the zooplankton population, the former constituting more than half of the biomass of the sample. Their numerical abundance decreased with depth. The adaptive...

  4. Fertilizantes para produção de Daphnia sp. (Crustacea, Cladocera) em tanques experimentais

    OpenAIRE

    Cunha, Patrícia de Souza Lima; Lanna, Eduardo Arruda Teixeira; Bastos, Rafael Kopschitz Xavier; Quadros, Moisés; Rezende, Fabrício Pereira; Freitas, Leandro Monteiro de

    2010-01-01

    The current study was aimed at investigating the use of different fertilizers - dicalcium phosphate, biosolid and quail feces - as a strategy for water fertilization in Daphnia sp production. It was used twenty-four 100-L tanks of asbestos cement distributed in a completely randomized split-plot design with six replicates, with plots in the three kinds of fertilizers (biosolid, dicalcium phosphate, and quail feces) and a control without fertilization (WF) and subplots at the times of assessme...

  5. A phylogeny-based revision of the family Luciferidae (Crustacea: Decapoda)

    DEFF Research Database (Denmark)

    Vereshchaka, Alexander L.; Olesen, Jørgen; Lunina, Anastasia A.

    2016-01-01

    Luciferidae is a family of peculiar and widely distributed shrimps with an unclear systematic position and uncertain internal phylogeny. We undertook a phylogenetic analysis of Luciferidae based on 169 morphological characters (147 binary, 22 multistate). Several characters were based on scanning...... electron microscopy studies of the reproductive organs (e.g. petasma). All seven recognized species of Luciferidae were included as well as 17 additional species representing all other genera of Sergestoidea. Characters were polarized using three outgroups of the superfamily Penaeoidea, occurring in three...... different types of oceanic habitat. The phylogenetic analysis revealed monophyly of Luciferidae and the presence of two terminal robust clades within the family, which we treat as separate genera, Lucifer and Belzebub gen. nov. Morphological trends within Luciferidae are discussed, and diagnoses and keys...

  6. Phylogeny and evolution of life history strategies of the Parasitic Barnacles (Crustacea, Cirripedia, Rhizocephala)

    DEFF Research Database (Denmark)

    Glenner, Henrik; Hebsgaard, Martin Bay

    2006-01-01

    to resolve the phylogenetic relationship of the order Rhizocephala and elucidate the evolution of the different life history strategies found within the Rhizocephala, we have performed the first comprehensive phylogenetic analysis of the group. Our results indicate that Rhizocephala is monophyletic...... in the suborder Akentrogonida, where the last pelagic larval stage directly injects the parasitic material into the heamolymph of the host is derived, and has evolved only once within the Rhizocephala. Lastly, our results show that the ancestral host for extant rhizocephalans appears to be the anomuran...

  7. Local and regional species diversity of benthic Isopoda (Crustacea) in the deep Gulf of Mexico

    Science.gov (United States)

    Wilson, George D. F.

    2008-12-01

    Recent studies of deep-sea faunas considered the influence of mid-domain models in the distribution of species diversity and richness with depth. In this paper, I show that separating local diversity from regional species richness in benthic isopods clarifies mid-domain effects in the distribution of isopods in the Gulf of Mexico. Deviations from the randomised implied species ranges can be informative to understanding general patterns within the Gulf of Mexico. The isopods from the GoMB study contained 135 species, with a total of 156 species including those from an earlier study. More than 60 species may be new to science. Most families of deep-sea isopods (suborder Asellota) were present, although some were extremely rare. The isopod family Desmosomatidae dominated the samples, and one species of Macrostylis (Macrostylidae) was found in many samples. Species richness for samples pooled within sites ranged from 1 to 52 species. Because species in pooled samples were highly correlated with individuals, species diversity was compared across sites using the expected species estimator ( n=15 individuals, ES 15). Six depth transects had idiosyncratic patterns of ES 15, and transects with the greatest short-range variation in topography, such as basins and canyons, had the greatest short-range disparity. Basins on the deep slope did not have a consistent influence (i.e., relatively higher or lower than surrounding areas) on the comparative species diversity. ES 15 of all transects together showed a weak mid-domain effect, peaking around 1200-1500 m, with low values at the shallowest and deepest samples (Sigsbee Abyssal Plain); no longitudinal (east-west) pattern was found. The regional species pool was analyzed by summing the implied ranges of all species. The species ranges in aggregate did not have significant patterns across longitudes, and many species had broad depth ranges, suggesting that the isopod fauna of the Gulf of Mexico is well dispersed. The summed ranges, as expected, had strong mid-domain patterns, contrasting with the local species richness estimates. The longitudinal ranges closely matched a randomized pattern (species ranges placed randomly, 1000 iterations), with significant deviations in the east attributable to lower sampling effort. The depth pattern, however, deviated from the mid-domain model, with a bimodal peak displaced nearly 500 m shallower than the mode of the randomized distribution. The deviations from random expectation were significantly positive above 1600 m and negative below 2000 m, with the result that regional species richness peaked between 800 and 1200 m, and decreased rapidly at deeper depths. The highest species richness intervals corresponded to the number of individuals collected. Residuals from a regression of the deviations on individual numbers, however, still deviated from the randomized pattern. In this declining depth-diversity pattern, the Gulf of Mexico resembles other partially enclosed basins, such as the Norwegian Sea, known to have suffered geologically recent extinction events. This displaced diversity pattern and broad depth ranges implicate ongoing re-colonization of the deeper parts of the Gulf of Mexico. The Sigsbee Abyssal Plain sites could be depauperate for historical reasons (e.g., one or more extinction events) rather than ongoing ecological reasons (e.g., low food supply).

  8. A new species of the genus Paracypria (Crustacea: Ostracoda: Cypridoidea) from the Fiji Islands.

    Science.gov (United States)

    Chand, Prerna; Kamiya, Takahiro

    2016-08-30

    A new marine species of the genus Paracypria (Paracypria fijiensis n. sp.) is reported from the Fiji Islands, a small island archipelago in the South Pacific Ocean. This is the first report of a Paracypria species from the Fiji Islands. Descriptions of soft parts and valves of Paracypria fijiensis n. sp. are presented herein, and morphological comparisons are made with existing Paracypria species from Australia, Japan and New Caledonia. Although eight coastal sites were sampled across the Fiji Islands, the new Paracypria species was found at only three sites. Large numbers of P. fijiensis n. sp. were recorded from intertidal flats, indicating it to be highly tolerant of the dynamic intertidal zone conditions.

  9. Native Argentinean cyclopoids (Crustacea: Copepoda as predators of Aedes aegypti and Culex pipiens (Diptera: Culicidae mosquitoes

    Directory of Open Access Journals (Sweden)

    María C Tranchida

    2009-12-01

    Full Text Available Copepods from La Plata, Argentina were investigated to characterize the local community of larvivorous copepods inhabiting mosquito breeding sites and to identify new predator species of the mosquitoes which occur in artificial containers, Aedes aegypti and Culex pipiens. Diversity of larvivorous cyclopoids was highest in permanent pools. Predation by sex and age, selectivity on mosquito species, and daily predation rate during five days were studied for Acanthocyclops robustus, Diacyclops uruguayensis, Macrocyclops albidus and Mesocyclops longisetus. Female copepods presented the highest predatory capacity. No predatory preference for mosquito species was found. According to overall predation potential, copepods were ranked as follows: D. uruguayensis Se hizo una prospección de copépodos en La Plata, Argentina, con los objetivos de caracterizar la comunidad local de copépodos larvívoros en sitios de cría de mosquitos, e identificar nuevas especies depredadoras de los mosquitos de contenedores artificiales Aedes aegypti y Culex pipiens. La diversidad de ciclopoides larvívoros fue máxima en charcos permanentes. Se examinó la depredación por sexos y edad, la selectividad por especies de mosquito, y la tasa de depredación diaria durante cinco días en Acanthocyclops robustus, Diacyclops uruguayensis, Macrocyclops albidus y Mesocyclops longisetus. Los copépodos hembra presentaron la capacidad depredadora más alta. No se encontró preferencia por alguna especie de mosquito. De acuerdo al potencial de depredación en general, los copépodos se ordenan así: D. uruguayensis < A. robustus < M. albidus < M. longisetus. También se evaluó la tolerancia a la desecación del hábitat y la capacidad de resistir en agua de contenedores artificiales. D. uruguayensis y A. robustus sobrevivieron en condiciones de sequía, pero D. uruguayensis presentó menor supervivencia en agua de floreros de cementerio. M. albidus no sobrevivió condiciones de sequía y no toleró el agua extraída de contenedores artificiales. Los ciclopoides neotropicales D. uruguayensis and A. robustus son buenos candidatos y merecen investigación ulterior como agentes de control biológico de mosquitos.

  10. Relative growth of Acantholobulus schmitti (Rathbun, 1930 (Crustacea, Brachyura, Panopeidae at Guaratuba Bay, southern Brazil

    Directory of Open Access Journals (Sweden)

    SF Frigotto

    Full Text Available A study on the relative growth of the crab Acantholobulus schmitti (Rathbun, 1930 (Decapoda, Brachyura, Panopeidae was performed with allometric techniques. The species is associated with lanterns used for oyster farming at Guaratuba Bay, southern Brazil. Crabs were obtained from five lanterns from March through December 2009. The following morphological characteristics were measured: the carapace width (CW, the height and length of the major cheliped propodus (LPH and LPL, the width of the female abdomen at the base of the 4th somite (AW and the length of the male gonopod (GL. A total of 1,004 individuals of A. schmitti were measured, of which 451 were males, 323 non-ovigerous females and 230 ovigerous females. The CW of the males varied from 1.87 to 11.86 mm, that of non-ovigerous females from 1.44 to 8.77 mm and that of ovigerous females from 4.09 to 11.12 mm. The plot of LPH against CW showed a mean inflection point at 3.67 mm CW for the males. This result indicated that male crabs are juvenile below this value and adult above it. For the females, the corresponding inflection point occurred at 3.36 mm CW in the plot of AW against CW. These results, CW x LPH and CW x AW, highlight the importance of chelae enlargement at the onset of maturation in males. Similarly, the widening of the abdomen in females is required to accommodate egg clutches during the reproductive period. Heterochely was recorded in both sexes. Right-handed crabs were more frequent than left-handed ones, with percentages of 75.8% in males and 82.7% in females. The population of A. schmitti from Guaratuba Bay becomes sexually mature at an earlier age than A. schmitti from the coast of São Paulo state. The lanterns used in oyster farming furnish a safe habitat in which these crabs can spend their entire benthic life.

  11. Dead shrimp blues: a global assessment of extinction risk in freshwater shrimps (Crustacea: Decapoda: Caridea.

    Directory of Open Access Journals (Sweden)

    Sammy De Grave

    Full Text Available We present the first global assessment of extinction risk for a major group of freshwater invertebrates, caridean shrimps. The risk of extinction for all 763 species was assessed using the IUCN Red List criteria that include geographic ranges, habitats, ecology and past and present threats. The Indo-Malayan region holds over half of global species diversity, with a peak in Indo-China and southern China. Shrimps primarily inhabit flowing water; however, a significant subterranean component is present, which is more threatened than the surface fauna. Two species are extinct with a further 10 possibly extinct, and almost one third of species are either threatened or Near Threatened (NT. Threats to freshwater shrimps include agricultural and urban pollution impact over two-thirds of threatened and NT species. Invasive species and climate change have the greatest overall impact of all threats (based on combined timing, scope and severity of threats.

  12. Spelaeomysis cochinensis, a new mysid (Crustacea: Mysidacea) from a prawn culture field in Cochin, India

    Digital Repository Service at National Institute of Oceanography (India)

    Panampunnayil, S.U.; Viswakumar, M.

    with the protozoan (Fig. 27) but no effects by the para- sites upon their hosts could be observed. Acknowledgements We are thankful to the Director, National Insti- tute of Oceanography, Goa and the Scientist-in- Charge, Regional Centre of NIO, Cochin for pro...

  13. Distribution of some Calanoida (Crustacea: Copepoda from the Yucatán Peninsula, Belize and Guatemala

    Directory of Open Access Journals (Sweden)

    Gerd-Oltmann Brandorff

    2012-03-01

    Full Text Available Southern Mexico and Central America have many water bodies of different morphology and water chemistry with an interesting zooplankton fauna, originating from North or South America. A set of 63 samples, taken in 2005 and 2008, from water bodies of the Yucatan Peninsula karst, Belize and Guatemala, were studied for the content of calanoid copepods. Old and recent literature was used to determine animals to species level. Drawings were prepared with a microscope and a camera lucida. A total of 32 samples with totally six species contained calanoid copepods: one estuarine pseudodiaptomid and five freshwater diaptomids. Pseudodiaptomus marshi was found at different salinities. It is confirmed that the commonest diaptomids in the Yucatan Peninsula are Arctodiaptomus dorsalis and Mastigodiaptomus nesus. The former was also recorded from Lake Amatitlan. Mastigodiaptomus nesus is as widespread as A. dorsalis but it is absent from the Lake Peten area in Guatemala. Mastigodiaptomus reidae was found in two shallow habitats, these specimens differ from those from the type locality by having a set of peculiar large spine-like processes on the last thoracic and the urosome segments of the females. Leptodiaptomus siciloides was found only in Lake Ayarza with high salinity. Prionodiaptomus colombiensis occurred in the highlands of Guatemala in Lago de Güija and in the Peten area in Laguna Sacpuy. We contributed with our occurrence records to a better knowledge of the geographic distribution of some calanoid copepods. Morphological findings in some species are of value for taxonomic differentiation between species.El sur de México y América Central tienen varios cuerpos de agua con diferente morfología, composición química y una interesante fauna de zooplancton procedente de América del Norte o del Sur. Un grupo de 63 muestras, fueron tomadas en 2005 y 2008 para conocer la cantidad de copépodos calanoides en los cuerpos de agua del karst Península de Yucatán, Belice y Guatemala. Se utilizó literatura antigua y reciente para la identificación de los especímenes a nivel de especie y se preparon dibujos con un microscopio y una cámara lúcida. En un total de 32 muestras se obtuvieron seis especies de copépodos calanoides: un pseudodiaptomidos estuarino y cinco diaptomidos de agua dulce. Pseudodiaptomus marshi fue encontrado a diferentes salinidades. Además, se confirmó que los diaptomidos más comunes en la Península de Yucatán fueron: Arctodiaptomus dorsalis y Mastigodiaptomus nesus. El primero se registró también en el lago de Amatitlán. Mastigodiaptomus nesus está ampliamente distribuido al igual que A. dorsalis, pero se encuentra ausente en el área del Lago Petén en Guatemala. Mastigodiaptomus reidae fue localizado en dos hábitats poco profundos, éstos especímenes difieren de los tipos de la localidad, por tener un grupo de espinas de gran tamaño en la última parte de la caja toráxica y los segmentos del urosoma de las hembras. Leptodiaptomus siciloides se encontró sólo en el Lago Ayarza, el cual contiene alta salinidad. Prionodiaptomus colombiensis se localizó en las tierras altas de Guatemala en el Lago de Güija y en la zona del Petén en Laguna Sacpuy. Se contribuye con registros de presencia de especies para un mejor conocimiento de la distribución geográfica de algunos copépodos calanoides. De la misma forma, los hallazgos morfológicos en algunas especies son de gran valor taxonómico para la diferenciación de especies.

  14. A new genus and species of Heteromysini (Crustacea- Mysidacea) from the backwater of Kochi (Kerala, India)

    Digital Repository Service at National Institute of Oceanography (India)

    Panampunnayil, S.U.; Buju, A.

    between 9u409120 and 10u109460N and 76u09952’’ and 76u239570E. The total area of the backwater is about 157 km 2 with depth ranging from 2 to 8 m. A large number of rivers discharge into it and it opens into the Arabian Sea through one major and several... Heteromysini by Bowman and Orsi (1992), the diagnostic characters of the tribe are as follows: the male lobe of antennules usually reduced, antennal scale setose all round, carpus and propodus of thoracic limbs 4–8 fused and divided into subsegments, all...

  15. Designation of a neotype for Parastacus nicoleti (Philippi, 1882) (Crustacea: Decapoda: Parastacidae).

    Science.gov (United States)

    Ribeiro, Felipe Bezerra; Araujo, Paula Beatriz

    2017-10-24

    The type specimen of Parastacus nicoleti (Philippi, 1882) was not designated and the material used for the description has never been found. We designate herein the neotype of P. nicoleti based on the examination of specimens from the type locality deposited in the Museo Nacional de Historia Natural of Chile previously analyzed by Bahamonde (1958), who confirmed the identity and validated the species. To improve the species description we included new drawings and provide additional morphological characters. A synonym list and updated distribution map of this species are also provided.

  16. A case of homonymy in fossil verrucid barnacles: Verruca withersi (Crustacea, Thoracica)

    NARCIS (Netherlands)

    Jagt, J.W.M.; Buckeridge, J.S.

    2005-01-01

    For fossil verrucid barnacles, the name Verruca withersi appears to have been used twice; Schram & Newman described material from the Albian-Cenomanian (Cretaceous) of Colombia, while Kruizinga had previously recorded a new species from the Pleistocene(?) or perhaps younger strata of Sumba

  17. Long-term Hg pollution induced Hg tolerance in the terrestrial isopod Porcellio scaber (Isopoda, Crustacea)

    International Nuclear Information System (INIS)

    Lapanje, A.; Drobne, D.; Nolde, N.; Valant, J.; Muscet, B.; Leser, V.; Rupnik, M.

    2008-01-01

    The aim of our work was to assess the pollution-induced community tolerance (PICT) of isopod gut microbiota and pollution-induced isopod population tolerance (PIPT). Animals collected from a chronically Hg polluted and an unpolluted location were exposed for 14 days to 10 μg Hg/g dry food under laboratory conditions. The lysosomal membrane stability, hepatopancreas epithelium thickness, feeding activity and animal bacterial gut microbiota composition were determined. The results confirm the hypothesis that the response to short-term Hg exposure differs for animals from the Hg polluted and the unpolluted field locations. The animals and their gut microbiota from the Hg polluted location were less affected by Hg in a short-term feeding experiment than those from the unpolluted environment. We discuss the pollution-induced population tolerance of isopods and their gut microbiota as a measure of effects of long-term environmental pollution. The ecological consequences of such phenomena are also discussed. - Isopods (Porcellio scaber) as well as their bacterial gut community from a mercury-polluted site are mercury tolerant

  18. Presencia de Metalpheus rostratipes (Pocock, 1890) (Crustacea: Alpheidae) en el Caribe colombiano

    OpenAIRE

    Navas-S., G.R.; Lattig, P.; Moreno-Forero, S.K.

    1999-01-01

    Samples of skeletons of the coral Acropora palmata obtained on the reef crest of Isla Grande, Islas del Rosario (colombian Caribbean),were found to contain two specimens of the family Alpheidae, Metalpheus rostratipes (Pocock, 1890). This shrimp species is reported for the first time from the colombian Caribbean.

  19. Effect of carbaryl (carbamate insecticide) on acetylcholinesterase activity of two strains of Daphnia magna (Crustacea, Cladocera).

    Science.gov (United States)

    Toumi, Hela; Bejaoui, Mustapha; Touaylia, Samir; Burga Perez, Karen F; Ferard, Jean François

    2016-11-01

    The present study was designed to investigate the effect of carbaryl (carbamate insecticide) on the acetylcholinesterase activity in two strains (same clone A) of the crustacean cladoceran Daphnia magna. Four carbaryl concentrations (0.4, 0.9, 1.8 and 3.7 µg L(-1)) were compared against control AChE activity. Our results showed that after 48 h of carbaryl exposure, all treatments induced a significant decrease of AChE activities whatever the two considered strains. However, different responses were registered in terms of lowest observed effect concentrations (LOEC: 0.4 µg L(-1) for strain 1 and 0.9 µg L(-1) for strains 2) revealing differences in sensitivity among the two tested strains of D. magna. These results suggest that after carbaryl exposure, the AChE activity responses can be also used as a biomarker of susceptibility. Moreover, our results show that strain1 is less sensitive than strain 2 in terms of IC50-48 h of AChE activity. Comparing the EC50-48 h of standard ecotoxicity test and IC50-48 h of AChE inhibition, there is the same order of sensitivity with both strains.

  20. The morphology of the male reproductive system, spermatogenesis and the spermatozoon of Daphnia magna (Crustacea: Branchiopoda).

    Science.gov (United States)

    Wuerz, Maggie; Huebner, Erwin; Huebner, Judith

    2017-11-01

    This study analyses the histological and cellular morphology of the testis and sperm development in the male Daphnia magna Straus 1820. Due to the rarity of males and predominately parthenogenetic lifecycle of Daphnia, there has been limited detailed information on males in contrast to the well-studied female. Using light and electron microscopy approaches, we describe the morphology of the testis during the progression from an immature to mature testis. The testis has an encasing muscular mesh sheath outside the basal lamina, beneath which is a thin somatic epithelial cell layer. Internal to the epithelium are the spermatogonial stem cells and subsequent syncytial clusters of the germ cells as they progress through spermatogenesis; spermatozoa occupy the entire testis in sexually mature D. magna. We describe the structure of developing and mature spermatozoa; mature spermatozoa are non-flagellated, ovoid in shape with plasmalemma filapodia and are encased in an extracellular capsule. © 2017 Wiley Periodicals, Inc.

  1. Acute and Chronic Effects of Tributyltin on the Mysid Acanthomysis sculpta (Crustacea, Mysidacea).

    Science.gov (United States)

    1986-05-01

    the overall goal of aquatic toxicology testing: "the protection of diverse aquatic organisms and whole ecological communities from the dire effects of...20 man-made chemicals" (Dagani, 1980). Aquatic toxicology testing is costly, and, depending upon the organism(s) being tested, requirements for...93-115. Dagani, R. (1980). Aquatic toxicology matures, gains importance. Chemical and Engineering Newsletter. 30 June, pp. 18-23. Dawkins, H.C. (1983

  2. Carideorum catalogus: the recent species of the dendrobranchiate, stenopodidean, procarididean and caridean shrimps (Crustacea: Decapoda)

    NARCIS (Netherlands)

    De Grave, S.; Fransen, C.H.J.M.

    2011-01-01

    A checklist of recent species of dendrobranchiate, stenopodidean, procarididean and caridean shrimps including synonyms and type localities. Also listed are unavailable names, larval names, nomina dubia and nomina nuda. A complete list of references to original descriptions of taxa listed is

  3. Secondary production of Chasmagnathus granulatus (Crustacea; Decapoda in a Ramsar Site from Argentina

    Directory of Open Access Journals (Sweden)

    II. César

    Full Text Available Secondary production of Chasmagnathus granulatus was calculated at the Refugio de Vida Silvestre Bahía Samborombón, Argentina (36° 16' S and 57° 06' W. Sampling was conducted on nine occasions between March 2001 and February 2003, crabs were collected by hand, physico-chemical variables, granulometry and organic matter contents of the sediments were registered. Crabs were classified as male, female and undifferentiated, measured (total carapace width: CW and weighed (wet and dry weight: DW at 60 °C, during 48 hours. A correlation analysis between CW and DW was made. Morphometric growth of C. granulatus was by the application of the power function (y = a x b, where the carapace width (CW was used as an independent variable. Males, females and undifferentiated individuals were analysed separately as well as all together as a group. The data were fitted indicating a positive allometry (constant of allometry b > 3, the males showing the greatest allometric value. The individuals (n = 957 juveniles and adults were separated in cohorts by the polymodal width-frequency distribution converted into normal curves. Three cohorts were found during the whole study period, and two cohorts coexisting in each sampling date. Ovigerous females were caught on December 2001, 2002 and February 2003. The size-frequency method was used to estimate the annual production. The major contribution to production was carried out by the mature individuals, in particular those with size between 25 and 30 mm, but on the other hand, only few individuals measuring from 10 to 20 mm were collected. The annual production of C. granulatus was estimated in 7.76 g.m-2. The biomass (expressed as total dry weight varied between 0.55 and 1.85 g.m-2, with the greater values being registered during autumn and spring, and the lower values during summer.

  4. Eight new species of ascidicolous copepods from the eastern coast of Korea (Crustacea, Copepoda, Cyclopoida)

    Science.gov (United States)

    Kim, Il-Hoi; Moon, Seong Yong

    2011-03-01

    Eight new species of copepods associated with shallow-water ascidians are described from the eastern coast of Korea. They are Ascidicola secundus n. sp. from a Pyura sp., Enteropsis nudus n. sp. from Pyura sacciformis (Drasche), Mycophilus capillatus n. sp. from a compound ascidian, Bonnierilla yangpoensis n. sp. from Phallusia cf. nigra Savigny, Janstockia truncata n. sp. from Chelyosoma siboja Oka, Pholeterides pilosa n. sp. from a compound ascidian, Pachypygus spinosus n. sp. from a solitary ascidian, and Paranotodelphys unguifer n. sp. from Ascidia samea Oka.

  5. Ostracoda (Arthropoda, Crustacea from the Riachuelo Formation, Sergipe-Alagoas Basin, Brazil, Upper Aptian-Albian

    Directory of Open Access Journals (Sweden)

    Lucas Silveira Antonietto

    2016-11-01

    Full Text Available The Sergipe-Alagoas Basin has one of the most complete, exposed lithological successions of the Cretaceous period in the continental margin of Brazil. It captures several phases of the evolution of the South Atlantic Ocean, including rift, gulf and drift. The upper Aptian–Albian Riachuelo Formation corresponds to the first stages of the southern proto-Atlantic Ocean invasion in that basin. The present study reviews the taxonomic identification and ecology of 39 ostracod species of this formation, proposing a new genus – Gabonorygma gen. nov. – and three new species – Praebythoceratina deltalata sp. nov., Gabonorygma sergipana gen. et sp. nov. and Brachycythere smithsoniana sp. nov. Other taxa include Conchoecia? sp. 1, Cytherella sp. 1, C. besrineensis comb. nov., Cytherelloidea aff. globosa, C. btaterensis, Bairdoppilata sp. 1, Bairdoppilata sp. 2, B. comanchensis comb. nov., B. pseudoseptentrionalis, Robsoniella falklandensis, Cetacella sp. 1, Paracypris eniotmetos, Harbinia sinuata?, H. crepata, Liasina sp. 1, Praebythoceratina amsittenensis comb. nov., P. trinodosa comb. nov., Patellacythere sp. 1, P. shimonensis comb. nov., Xestoleberis? sp. 1, Xestoleberis? sp. 2, Apatocythere? sp. 1, Neocythere? aff. pseudovanveeni, N. (Physocythere tenuis, Aracajuia antiqua comb. nov., A. benderi, A. fragilis comb. nov., Eocytheropteron sp. 1, Metacytheropteron aff. minuta, Microceratina? sp. 1, M. azazoulensis, Veenia guianensis, Algeriana? sp. 1, Quasihermanites? sp. 1 and Sergipella viviersae.

  6. Induction of ovarian growth in Aegla platensis (Crustacea, Aeglidae by means of neuroregulators incorporated to food

    Directory of Open Access Journals (Sweden)

    Alejandra V Cahansky

    2008-09-01

    Full Text Available The freshwater crab Aegla platensis was used as a model to induce ovarian growth by adding different neuroregulators to a pellet food formulation. Added compounds were the dopaminergic inhibitor spiperone or the enkephalinergic inhibitor naloxone, both of them at a dose of 10-8 mol/animal. Animals were fed on the enriched pellets twice a week. After 7 wk, the gonadosomatic index (GI was calculated as (gonad fresh weight / body fresh weight x 100. GI significantly increased only for those females fed on spiperone pellets, compared to a control group receiving pellets with no compound added. During the assayed period, spiperone would be reverting the arrest exerted by dopamine on the neuroendocrine stimulation of ovarian growth. On the other hand, for both spiperone and naloxone a higher GI was correlated to a higher lipid content of both gonads and/or hepatopancreas, suggesting an increased energetic demand in accordance with an active investment in reproduction. Rev. Biol. Trop. 56 (3: 1201-1207. Epub 2008 September 30.Se utilizó al anomuro de agua dulce Aegla platensis como modelo para inducir el crecimiento ovárico mediante el agregado de diferentes neuroreguladores a una formulación de alimento pelleteado. Los compuestos agregados fueron el inhibidor dopaminergico spiperona ó el inhibidor encefalinérgico naloxone, ambos a una dosis de 10-8 moles/animal. Los animales fueron alimentados dos veces a la semana con pellets enriquecidos con alguno de los neuroreguladores. Luego de 7 semanas, se calculó el índice gonadomático (IG como (peso gonadal fresco/ peso corporal fresco x 100. El IG mostró un incremento significativamente sólo en aquellas hembras alimentadas con pellets enriquecidos con spiperona, en comparación con un grupo control que recibió pellets sin agregado alguno. Durante el período ensayado, la spiperona estaría revirtiendo el arresto ejercido por la dopamina sobre la estimulación neuroendocrina del crecimiento ovárico. Por otro lado, para ambos grupos experimentales (spiperona y naloxone, un mayor valor de IG estuvo correlacionado a un mayor incremento del contenido de lípidos tanto en gonadas como en hepatopáncreas, sugiriendo una demanda energética incrementada en relación con una activa inversión en reproducción

  7. Crecimiento en poblaciones de Artemia franciscana y A. persimilis (Crustacea, Anostraca en condiciones controladas

    Directory of Open Access Journals (Sweden)

    Patricio De los Ríos

    2001-06-01

    Full Text Available Se comparó el crecimiento individual expresado en largo total, de dos poblaciones de A. franciscana (Utah, Estados Unidos, y Yape, Chile y A. persimilis (Salinas de Hidalgo, Argentina cultivadas a partir de quistes bajo condiciones controladas (24°C, agua de mar 35 g/l, alimentación con Chaetoceros calcitrans. Se encontraron diferencias significativas en todos los estadios analizados entre las poblaciones de A. franciscana de Utah y A. persimilis, mientras que entre A. persimilis y A. franciscana de Yape, hubo similitudes sólo en dos estadios, y A. franciscana de Utah y Yape registraron similar tamaño corporal para todos los estadios analizados. Las adaptaciones a los hábitats podrían explicar estos resultados.Growth (length, was compared in A. franciscana populations from Utah, United States of America, and Yape, Chile, and A. persimilis (population from Salinas de Hidalgo, Argentina, cultured under controlled conditions (24°C, seawater 35 g/l, feeding with Chaetoceros calcitrans. There were significant differences among all stages of A. franciscana (Utah and A. persimilis, whereas we found significantly differences only in two stages of A. persimilis and A. franciscana (Yape; both A. franciscana had similar total lengths in all stages analyzed. Habitat adaptations could explain these results.

  8. Mineralization of 14C-labelled plant material by Porcellio scaber (Crustacea, Isopoda)

    International Nuclear Information System (INIS)

    Griffiths, B.S.; Wood, S.; Cheshire, M.V.

    1989-01-01

    Leaf litter was incubated in a mineral soil in the presence or absence of mature Porcellio scaber. The invertebrate caused an increase in the numbers of bacteria, ammonifying bacteria, actinomycetes and protozoa in the soil. The decomposition of 14 C-labelled Lemna gibba was significantly increased by the presence of P. scaber as determined by the total label remaining in the soil and the changes in sugars. 14 C-labelled faeces derived from L. gibba decomposed at a slower rate than the plant tissue from which it originated. (author)

  9. Notes on a Sacculina carpiliae Guérin-Ganivet (Crustacea Rhizocephala)

    NARCIS (Netherlands)

    Boschma, H.

    1949-01-01

    Certain Rhizocephalan parasites of the crabs Xanthias lamarcki (H. M. E.), Lybia tesselata (Latr.), and Glyptoxanthus vermiculatus (Lam.) mutually so closely correspond in all their characters that undoubtedly they belong to the same species. When the characters of this species are defined it

  10. On a parthenogenetic population of Artemia (Crustacea, Branchiopoda) from Algeria (El-Bahira, Sétif)

    OpenAIRE

    Mounia Amarouayache; Naim Belakri

    2015-01-01

    The brine shrimp Artemia is a small crustacean of hypersaline lakes which is commonly used in larviculture. The parthenogenetic population of Artemia from El-Bahira Lake (10 ha area), situated in the High Plateaus of Northeastern Algeria (1034 m alt), has been characterized and surveyed during two hydroperiods of 2009 and 2013. Contrary to other known parthenogenetic populations, which develop in hot seasons and reproduce by ovoviviparity, Artemia from El-Bahira was found to develop only i...

  11. Sulfide Shrimp? Observations on the concealed life history of the Thermosbaenacea (Crustacea

    Directory of Open Access Journals (Sweden)

    Francis Por

    2014-10-01

    Full Text Available The discovery and subsequent observation over various years of a massive population of the thermosbaenacean Tethysbaena ophelicola Wagner in the subterranean karstic sulfide pool of Ayyalon (Israel enabled us to reach conclusions about the previously unknown life strategy of this crustacean super-order. These are preferably monophagous sulfur-bacteria-eating pelagic shrimps of stratified subterranean pools, adapted to microaerobic-anaerobic conditions, by among others ovoviviparity and the probable help of sulfide detoxifying bacterial endosymbiosis.

  12. On a parthenogenetic population of Artemia (Crustacea, Branchiopoda from Algeria (El-Bahira, Sétif

    Directory of Open Access Journals (Sweden)

    Mounia Amarouayache

    2015-12-01

    Full Text Available The brine shrimp Artemia is a small crustacean of hypersaline lakes which is commonly used in larviculture. The parthenogenetic population of Artemia from El-Bahira Lake (10 ha area, situated in the High Plateaus of Northeastern Algeria (1034 m alt, has been characterized and surveyed during two hydroperiods of 2009 and 2013. Contrary to other known parthenogenetic populations, which develop in hot seasons and reproduce by ovoviviparity, Artemia from El-Bahira was found to develop only in cold seasons (winter and spring, even if the lake doesn’t dry in summer. It reproduces by oviparity and produces few cysts (5.69 ± 3.6 and 98.00 ± 28.32 offsprings/brood. Individual density was much lower during the hydroperiod of 2013, whereas fecundity was higher than in the previous hydroperiod (2009. Cyst reserve was estimated at 133.13 kg of dry weight which corresponds to a rate of 13.31 kg.ha-1.

  13. Seven new freshwater species of Gammarus from southern China (Crustacea, Amphipoda, Gammaridae

    Directory of Open Access Journals (Sweden)

    Zhonge Hou

    2018-04-01

    Full Text Available Seven new species of the genus Gammarus are described and illustrated from southern China. The new species Gammarus vallecula Hou & Li, sp. n., G. qinling Hou & Li, sp. n., G. zhigangi Hou & Li, sp. n. and G. jidutanxian Hou & Li, sp. n. are characterized by inner ramus of uropod III half the length of outer ramus. Gammarus longdong Hou & Li, sp. n. is characterized by inner ramus of uropod III 0.9 times as long as outer ramus. Gammarus mosuo Hou & Li, sp. n. is characterized by pereopods V–VII with long setae on anterior margins and both rami of uropod III armed with simple setae. Gammarus caecigenus Hou & Li, sp. n. can be distinguished from other species by eyes absent. DNA barcodes of the new species are documented as proof of molecular differences between species. A key to the new species and a map of their distributions are provided.

  14. Jerbarnia stocki, a new species from the Barrier Reef (Crustacea, Amphipoda)

    NARCIS (Netherlands)

    Thomas, James Darwin; Barnard, J.L.

    1990-01-01

    A new species of Jerbarnia is described in 2 meters of depth from Lizard Island on the Great Barrier Reef. It is the first species from depths shallower than 13 m. The species differs from all but J. aquilopacifica (Japan) in the lack of major teeth on pleonites 1-3 and from the latter species in

  15. Five Sarsiellidae ostracods (Crustacea: Myodocopida) from the South Coast of Korea (East China Sea).

    Science.gov (United States)

    Karanovic, Ivana; Soh, Ho-Young

    2015-04-17

    The East China Sea is part of the Warm Temperate Northwest Pacific zoogeographic province and, as such, has a high biodiversity and many tropical and subtropical biotic elements. Nevertheless, many invertebrate groups from this area remain poorly studied. Ostracods are one of them, especially those belonging to the subclass Myodocopa. In this paper we provide the first data on a diverse myodocopid family, Sarsiellidae, not only for the East China Sea, but also for Korea. Five species are reported in this paper from three Korean islands (Jeju, Chuja, and Maemul), and they are only a part of the ostracods collected during this study, indicating a high diversity of the group in this region. Three new species, Eurypylus koreanus sp. nov., Eusarsiella hanguk sp. nov., and Sarsiella nereis sp. nov., clearly stand apart from their respective congeners, mostly by prominent shell characters but also by details of the soft part morphology. Their affinity though clearly indicates a close connection of the region with the more southern zoogeographical realms, especially Central Indo Pacific and partly Temperate Australasia. Two species previously known from Japan (north part of the Sea of Japan and southeastern part of the Pacific Coast of Japan), Sarsiella japonica Hiruta, 1977 and S. misakiensis Kajiyama, 1912, are redescribed. Based on 11 newly obtained COI sequences we construct a preliminary phylogenetic tree, which supports previous hypotheses based on the morphological data, that Eusarsiella Cohen & Kornicker, 1975 is a polyphyletic taxon. With the maps of species distribution provided for each of the three genera, we give an overview of their current zoogeography, and clearly indicate areas that have no data, mostly due to the lack of investigation.

  16. PREVALENCE OF BARNACLES (CRUSTACEA; CIRRIPEDIA AND ITS POSSIBLE RELATION TO FIBROPAPYLLOMATOSIS IN CHELONIA MYDAS

    Directory of Open Access Journals (Sweden)

    R. R. Zamana

    2017-10-01

    Full Text Available A fibropapilomatose é uma afecção tumoral, caracterizada pela presença de tumores cutâneos que variam em tamanho entre 0.1 a mais de 30 cm de diâmetro. É considerada uma afecção debilitante e potencialmente fatal para as tartarugas marinhas, afetando principalmente a espécie Chelonia mydas, mas também é uma doença que tem sido registrada em outras espécies. Evidências levam a crer que a etiologia da fibropapilomatose é viral e está associada a áreas costeiras poluídas que apresentam alta densidade humana, grande aporte de resíduos industriais, domésticos e agrícolas e biotoxinas marinhas, contudo, fatores como parasitos podem ser um adicional a etiologia da afecção. Sanguessugas, cracas, algas e trematodas digenéticos foram sugeridos como um possível fator adicional na etiologia da fibropapilomatose nas tartarugas verdes (Chelonia mydas. O objetivo do presente estudo é estudar a possível associação de cracas com a fibropapilomatose na espécie Chelonia mydas (tartaruga-verde. Para isso foi realizado um levantamento bibliográfico sobre a presença de cracas em Chelonia mydas e a possível relação dessas espécies de cracas com a fibropapilomatose. Os dados foram obtidos de artigos, base de dados, cartilhas, livros, revistas científicas, sites e teses. Nesse estudo, foram encontradas 20 espécies de cracas associadas à Chelonia mydas. Sendo que dos 18 trabalhos analisados as espécies que apresentam maior frequência são a Chelonibia testudinaria (55,56% e Platylepas hexastylos (33,34%. Nenhum trabalho com o objetivo exclusivo de estudar a relação das cracas com a fibropapilomatose foi encontrado. No entanto, alguns estudos relatam a presença de cracas em Chelonia mydas com fibropapilomas. Possivelmente não há associação de cracas com a fibropapilomatose, no entanto há a necessidade da realização de trabalhos de pesquisa com o objetivo exclusivo de estudar a relação das cracas com os fibropapilomas, já que os trabalhos encontrados que citam alguma consideração sobre o tema são poucos e restritos a determinadas regiões e não identificam as espécies de cracas, o que indica que também há a necessidade de estudos taxonômicos para as espécies.

  17. Dry season distribution of land crabs, Gecarcinus quadratus (Crustacea: Gecarcinidae, in Corcovado National Park, Costa Rica

    Directory of Open Access Journals (Sweden)

    Megan E Griffiths

    2007-03-01

    Full Text Available The land crab Gecarcinus quadratus is an engineering species that controls nutrient cycling in tropical forests. Factors regulating their coastal distribution are not fully understood. We quantified land crab distribution during the dry season at Sirena Field Station in Corcovado National Park, Costa Rica, and found that land crab burrow density decreases with increasing distance from the ocean. Leaf litter depth and tree seedling density are negatively correlated with land crab burrow density. Burrows are strongly associated with sand substrate and burrow density is comparatively low in clay substrate. Results suggest that G. quadratus is limited to a narrow coastal zone with sand substrate, and this distribution could have profound effects on plant community structure. Rev. Biol. Trop. 55 (1: 219-224. Epub 2007 March. 31.El cangrejo terrestre Gecarcinus quadratus es una especie "ingeniera" que controla el ciclo de nutrientes en los bosques tropicales. Los factores que regulan su distribución a lo largo de las costas no se conocen de forma definitiva. Se cuantificó la distribución del cangrejo terrestre durante la estación seca en la Estación de Campo Sirena en el Parque Nacional de Corcovado, Costa Rica, y se encontró que la densidad de galerías del cangrejo terrestre disminuye al aumentar la distancia al océano. La profundidad de la hojarasca y la densidad de plántulas de especies arbóreas están negativamente correlacionadas con la densidad de galerías del cangrejo terrestre. Las galerías aparecen fuertemente asociadas con el sustrato arenoso y la densidad de galerías es comparativamente más baja en sustratos arcillosos. Estos resultados sugieren que G. quadratus se encuentra en una zona costera estrecha con sustrato arenoso, y que esta distribución podría tener efectos importantes en la estructura de la comunidad vegetal.

  18. Resting stages of Tortanus forcipatus (Crustacea, Calanoida) in sediments of Victoria Harbor, Hong Kong

    Science.gov (United States)

    Dahms, Hans-Uwe; Li, Xiangdong; Zhang, Gan; Qian, Pei-Yuan

    2006-05-01

    The distribution and abundance of viable and non-viable (so-called resting eggs) embryos of the calanoid copepod Tortanus forcipatus were determined in the laboratory by the enumeration of nauplii that emerge from sediments collected in Victoria Harbor (Hong Kong). Sediment cores sliced down to a depth of 37 cm showed the highest number of viable resting eggs near the surface layer (0-5 cm). The number of viable eggs sharply decreased with sediment depth, particularly at the inner harbor stations, although diapause eggs remained viable as deep as 25 cm. 210Pb analyses of the sediments indicated that the mean egg age was 4.9 years. The egg mortality of T. forcipatus in the sediments was 0.135 year -1, or 78.22% annual egg survival, calculated by regressing ln (egg density) from sediment age. The range of horizontal distribution of viable resting eggs was 24.25 × 10 3-58.90 × 10 3 m -2, with a mean value of 36.8 × 10 3 m -2 over all stations. The accumulation of viable resting eggs that can persist for an extended period of time provided evidence for the existence of an egg bank of T. forcipatus in the sediments of Victoria Harbor.

  19. A new species of crinoid-associated Periclimenes from Honduras (Crustacea: Decapoda: Palaemonidae).

    Science.gov (United States)

    De Grave, Sammy

    2014-05-02

    A new species of crinoid associated Periclimenes, P. rincewindi sp. nov. is described from the Bay Islands (Honduras) in the Caribbean. The species associates with the swimming crinoid, Analcidometra armata and displays a unique colour pattern. Morphologically, the new species is closely related to the other known crinoid associates in the Caribbean, specifically Periclimenes crinoidalis, from which it can be distinguished by a suite of relatively minor morphological features.

  20. Studies on the planktonic Decapoda and Stomatopoda (Crustacea) from the western Bay of Bengal

    Digital Repository Service at National Institute of Oceanography (India)

    Paulinose, V.T.; Nair, V.R.; Goswami, S.C.

    and Nagapattinam. The maximum number of larvae obtained was 2393/100 m3 in a single haul from a coastal station, north off Madras. The major forms obtained in the present collections were penaeids, sergestids, carideans, thalassinids, pagurids, crab zoeae...

  1. Four new species of the genus Rhopalophthalmus (Mysidacea: Crustacea) from the northwest coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    Panampunnayil, S.U.; Biju, A.

    by the quantum of sea water influx and the riverine fresh water flow. The interior part of this complex creek systems is fringed by rich mangrove vegetation and salt marsh and recives large quantities of waste water thereby enhancing the nutrient level which...

  2. Records of Hippa strigillata (Stimpson, 1860 (Crustacea: Decapoda: Hippidae in the SE Gulf of California, Mexico

    Directory of Open Access Journals (Sweden)

    Daniela Ríos-Elósegui

    Full Text Available This paper presents details regarding the collections and records of H. strigillata in the Bay of Mazatlán, SE Gulf of California, Mexico. Samples of H. strigillata were obtained in this bay and suroundings area during different periods and deposited in the collection of UNAM, Mazatlán. Morphometric data, distribution, biological and ecological data were furnished.

  3. A new species of Lysmata Risso, 1816 (Crustacea, Decapoda, Lysmatidae) from the Gulf of Mexico.

    Science.gov (United States)

    Prakash, Sanjeevi; Baeza, J Antonio

    2017-12-12

    A new species of peppermint shrimp, Lysmata baueri n. sp., is described based on a single specimen from the eastern Gulf of Mexico. The new species can be distinguished from other morphologically similar species of Lysmata Risso, 1816 by the number of teeth, length and shape of the rostrum, the length of the antennular peduncle relative to the scaphocerite, the number of meral and ischial articles in the second pereiopods, and the number of spines on the flexor margin of the dactyli from the third to fifth pereiopods. Morphological characters demonstrate that L. baueri n. sp., is most closely related to the eastern Pacific L. californica (Stimpson, 1866), L. nayaritensis Wicksten, 2000 and L. porteri (Rathbun, 1907).

  4. Two new species of Anisomysis (Crustacea - Mysidacea) from the Lakshadweep archipilago

    Digital Repository Service at National Institute of Oceanography (India)

    Panampunnayil, S.U.

    stream_size 8 stream_content_type text/plain stream_name J_Plankton_Res_15_1141.pdf.txt stream_source_info J_Plankton_Res_15_1141.pdf.txt Content-Encoding ISO-8859-1 Content-Type text/plain; charset=ISO-8859-1 ...

  5. Two new species of Siriella (Crustacea-Mysidacea) from the southwest coast of Australia

    Digital Repository Service at National Institute of Oceanography (India)

    Panampunnayil, S.U.

    stream_size 12 stream_content_type text/plain stream_name J_Plankton_Res_17_1939.pdf.txt stream_source_info J_Plankton_Res_17_1939.pdf.txt Content-Encoding ISO-8859-1 Content-Type text/plain; charset=ISO-8859-1 ...

  6. Marine pollution effects on the southern surf crab Ovalipes trimaculatus (Crustacea: Brachyura: Polybiidae) in Patagonia Argentina.

    Science.gov (United States)

    Lezcano, Aníbal Hernán; Rojas Quiroga, María Laura; Liberoff, Ana Laura; Van der Molen, Silvina

    2015-02-28

    We compared the carapace shape and thickness as well as the energy density of Ovalipes trimaculatus inhabiting areas comprising a gradient of marine pollution: high, moderate and undetected, in the Nuevo gulf (Patagonia Argentina). The carapace shape was evaluated by means of individual asymmetry scores (=fluctuating asymmetry) whereas the carapace thickness was assessed by measuring the carapace dry weight. The energy density was analyzed through its negative relationship with water content in muscle tissue. The individual asymmetry scores as well as the percentage of water content in muscle tissue were proportional to the marine pollution gradient, whereas the carapaces thickness did not differ among sampling sites. Our results are consistent with previous findings and demonstrate the direct effect of marine pollution on other taxa different from gastropods, cephalopods and polyplacophora and add to long-standing concerns about detrimental effects caused by marine pollution on the benthic community of the Nuevo gulf. Copyright © 2014 Elsevier Ltd. All rights reserved.

  7. Grooming as a secondary behavior in the shrimp Macrobrachium rosenbergii (Crustacea, Decapoda, Caridea)

    Science.gov (United States)

    VanMaurik, Lauren N.; Wortham, Jennifer L.

    2014-01-01

    Abstract The giant freshwater prawn, Macrobrachium rosenbergii, is a large shrimp extensively used in aquaculture whose grooming behaviors were analyzed in this study. Macrobrachium rosenbergii exhibits three unique male morphotypes that differ in their behavior, morphology and physiology: small-clawed males (SM), orange-clawed males (OC) and blue-clawed males (BC). The largest and most dominant males, BC males, are predicted to have significantly different grooming behaviors compared to females and the other two male morphotypes. These BC males may be too large and bulky to efficiently groom and may dedicate more time to mating and agonistic interactions than grooming behaviors. Observations were conducted to look at the prevalence of grooming behaviors in the absence and presence of conspecifics and to determine if any differences in grooming behavior exist among the sexes and male morphotypes. Significant differences in the grooming behaviors of all individuals (females and male morphotypes) were found. BC males tended to have the highest grooming time budget (percent of time spent grooming) while SM males had a relatively low grooming time budget. The grooming behaviors of the male morphotypes differed, indicating while these males play distinct, separate roles in the social hierarchy, they also have different grooming priorities. The conditions in which Macrobrachium rosenbergii are cultured may result in increased body fouling, which may vary, depending on the grooming efficiencies and priorities of these male morphotypes. Overall, grooming behaviors were found to be a secondary behavior which only occurred when primary behaviors such as mating, feeding or fighting were not present. PMID:25561831

  8. Redescription of Coutierea agassizi (Coutière, 1901) (Crustacea Decapoda, Palaemonidae)

    NARCIS (Netherlands)

    Holthuis, L.B.

    1978-01-01

    Since Coutière (1901) published the original description of his new species Coralliocaris Agassizi, no new finds of this species have been reported anymore. Recently a second specimen was collected by the University of Miami's R.V. "John Elliott Pillsbury", which makes it possible to give additional

  9. Taxonomy, phylogeny, historical biogeography, and historical ecology of the genus Pontonia (Crustacea: Decapoda: Caridea: Palaemonidae)

    NARCIS (Netherlands)

    Fransen, C.H.J.M.

    2002-01-01

    Species of the genus Pontonia Latreille, 1829, are distributed in tropical and subtropical waters around the world, living in association with either molluscan or ascidian hosts. In the present taxonomic revision, Pontonia sensu lato is divided into six genera: Pontonia sensu stricto; Ascidonia gen.

  10. Taxocenosis of mollusks and crustaceans on roots of Rhizophora mangle (Rhizophoraceae at Cispatá Bay, Córdoba, Colombia

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    Jorge Alexander Quirós R

    2013-05-01

    EN LA BAHÍA DE CISPATÁ, CÓRDOBA, COLOMBIA A pesar del conocimiento existente sobre la ecología de los manglares en la bahía de Cispatá, pocos estudios han sido enfocados en invertebrados asociados a las raíces del mangle rojo. Entre diciembre 2010 y septiembre 2011, se evaluó la estructura de los ensamblajes de moluscos y crustáceos asociados a las raíces de Rhizophora mangle en dos sectores de muestreo de la bahía de Cispatá, Colombia. Para la recolección del material biológico se tomaron al azar tres raíces de mangle homogéneas en cuanto al diámetro. Los organismos fueron obtenidos de la raíz raspando la superficie con un cuchillo, luego fueron separados y fijados en formalina al 10% para su posterior identificación. De los 12289 individuos recolectados en los cuatro muestreos, 10470 pertenecieron al phylum Mollusca (85,2% y los restantes 1819 al subphylum Crustacea (14,8%. Para los moluscos se identificaron 14 especies distribuidas en 12 familias y dos clases; Bivalvia y Gastropoda. Para los crustáceos se identificaron 24 especies distribuidas en 16 familias y cuatro órdenes; Sessillia, Decapoda, Isopoda y Amphipoda. En los dos sectores de muestreo Mytella charruana, Balanus eburneus y Crassostrea rhizophorae fueron las especies más importantes en términos de abundancia, no obstante M. charruana y B. eburneus presentan una gran capacidad de adaptación y ajuste a las variaciones hidroclimáticas, mostrándose como especies fuertemente eurihalinas, lo que se relejó en la dominancia de dichas especies en el sector B. La presencia de Petrolisthes armatus y Aratus pisonii indica que son especies de bosques de manglar con gran movilidad y mecanismos de adaptación fisiológicos, lo que justifica su presencia en el sector A.

  11. Distribuição geográfica da fauna e flora da Baía de Guanabara Geographic distribution of the flora and the fauna of the Guanabara Bay

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    Lejeune P. H. de Oliveira

    1947-09-01

    Full Text Available The author studied, the horizontal and vertical distribution of most common part of the flora and fauna of the bay of Guanabara at Rio de Janeiro. In this paper the eulittoral, poly, meso and oligohaline regions were localised and studied; and the first chart of its distribution was presented (fig. 2. The salinity of superficial waters was established through determinations based on 30 trips inside the buy for collecting biological materials. Some often 409 determinations which were previous reported together with the present ones served for the eleboration of a salinity map of the bay of Guanabara (fig. 1. This map of fig. 2 shows the geographic locations of the water regions. EULITTORAL WATER REGIME — Fig. 3 shows the diagram scheme of fauna and flora of this regime. Sea water salinity 34/1.000, density mean 1.027, transparent greenish waters, sea coast with moderate bursting waves. Limpid sea shore with white sand, gneiss with the big barnacle Tetraclita squamosa var. stalactifera (Lam. Pilsbry. Vertical distributions: barna¬cles layers with a green region in which are present the oyster Ostrea pa-rasitica L., the barnacles Tetraclita, Chthamalus, Balanus tintinnabulum var. tintinnabulum (L. e var. antillensis Pilsbry in connection with several mollusca and the sea beatle Isopoda Lygia sp. Covered by water and exposed to air by the tidal ritms, there is a stratum of brown animals that is the layer of mussels Mytilus perna L., with others brown and chestnut animals : the Crustacea Pachygrapsus, the little crab Porcellana sp., the stone crab Me-nippe nodifrons Stimpson, the sea stars Echinaster brasiliensis (Mull. & Tr., Astropecten sp. and the sea anemones Actinia sp. Underneath and never visible there is a subtidal region with green tubular algae of genus Codium and amidst its bunches the sea urchin Lycthchinus variegatus (Agass. walks and more deeply there are numerous sand-dollars Encope emarginata (Leske. The microplancton of this

  12. Spatial distribution of the Ocypode quadrata (Crustacea: Ocypodidae along estuarine environments in the Paranaguá Bay Complex, southern Brazil Distribuição espacial de Ocypode quadrata (Crustacea: Ocypodidae ao longo de ambientes estuarinos no sul do Brasil

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    Leonardo C. da Rosa

    2008-09-01

    Full Text Available This study examines the spatial distribution of the ghost crabs, Ocypode quadrata Fabricius, 1787, in thirteen estuarine sandy beaches located along two main axes of the Paranaguá Bay Estuarine Complex, southern Brazil. Burrow densities of ghost crabs were measured at three beach levels established around the high tide mark during the summer and winter of 2005. All beaches showed a steep beach face slope (2.6 to 8.3º with sediment composition varying from well sorted fine sand to very poorly sorted coarse sand towards the upper estuary. Water salinity ranged from around 31 at those beaches near the bay inlet, to 14 at beaches in the inner estuary. The burrow densities of O. quadrata in the estuarine beaches were similar to those observed in the oceanic beaches. However, the absence of burrows at the four innermost beaches suggests that low salinity and sediment penetrability may prevent ghost crabs from occurring in this region of the estuary. Burrow densities showed strong seasonal variability. The low densities observed during the winter are probably related to a delay crab activities due to low temperatures in the early morning during this season. The absence of a clear zonation pattern was related to estuarine beach morphology.O presente estudo avalia a distribuição espacial de Ocypode quadrata Fabricius, 1787 em treze praias estuarinas distribuídas ao longo dos dois principais eixos do complexo estuarino da Baia de Paranaguá, sul do Brasil. Em cada praia, a densidade de tocas do caranguejo em três níveis distribuídos em torno da marca da preamar foi estimada durante os períodos de verão e de inverno. Todas as praias apresentaram uma declividade bem acentuada (2,6 a 8,3º de inclinação e a composição do sedimento variando, em direção ao interior do estuário, de areia fina bem selecionada a areia grossa muito pobremente selecionada. A salinidade da água variou entre 31 (próximo à desembocadura da baía e 14 nas praias estuarinas mais internas. As densidades de tocas de O. quadrata nas praias estuarinas foram similares às registradas para as praias oceânicas. Entretanto, a ausência de tocas nas quatro praias estuarinas mais internas sugere que a salinidade junto com a penetrabilidade do sedimento possam ser fatores que inibam a ocorrência desse caranguejo nas regiões superiores do estuário. Entre as outras praias, a densidade de tocas mostrou uma marcada sazonalidade; os baixos valores observados durante o inverno estão provavelmente relacionados a um atraso na atividade dos caranguejos devido às baixas temperaturas durante o começo das manhãs de inverno. A ausência de um claro padrão de zonação foi relacionada à particular morfologia das praias estuarinas.

  13. Ecologia populacional dos Amphipoda (Crustacea dos fitais de Caiobá, Matinhos, Paraná, Brasil Population ecolocy of Amphipoda (Crustacea from the phytals of Caiobá, Matinhos, Paraná, Brazil

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    Janete Dubiaski-Silva

    1995-01-01

    Full Text Available Spalial and temporal density distributions of Amphipoda from the phytals of Caiobá are described. Air temperature oscillated from 16ºC (August and May to 23ºC (March, surface water temperature from 17ºC (August to 25ºC (March and the salinity from 29.3‰ (May to 32.8‰ (August. Two samples of 25cm² (for algae less than 5cm long, 100 cm² (for algae between 5-10cm long and whole plants (for algae more than 10cm long were removed with a spatula from the rocky surface at Caiobá Beach, in August/86, November/86, March/87 and May/87. After sorting, the algal substrata were weighted, their adsorption coefficient calculated and the sediment retained among the thallii weighted. The average distance between the branching was measured for all branched algae. The densities were calculated in relation to the weight of the algal substrate in grams. Eight phytals were considered: Ulva fasciata Delile, Padina gymnospora (Kútzing Vickers, Sargassum cymosum Garth, Porphyra atropurpurea (Olivi De Toni, Gelidium sp., Gymnogongrus griffithsiae (Turner Martius, Pterocladia capillacea (Gmelin Bornet &Thurel and Pterosiphonia pennata (Roth Falkenberg, over which nine Amphipoda species live: Ampithoe ramondi Audouin, 1816, Cymadusa filosa Savigny, 1852, Elasmopus pectenicrus Bate, 1857, Hyale media Dana, 1857, Hyale sp.l, Jassa falcata Montagu, 1895 and Sunampithoe pelagica H. Milne-Edwards, 1830 (Gammaridea. Caprella danilevskii Czerniavski, 1861 and Caprella penantis Leach, 1814 (Caprellidea. Amphipoda densities ranged from 0.27 ind.g-1 to 45.68. ind.g-1. The broad-thallii algae Porphyra, Ulva and Padina harbored lower densities of Amphipoda, whereas those finely branched Pterocladia, Pterosiphonia and Gymnogongrus, the highest values and the less branched Sargassum and Gelidium, intermediate values. The high densities found in the finely branched algae had as main contribution the juvenile recruiting of most Amphipoda. The tide level might have influenced the temporal distribution of the Amphipoda density, due to the distinct time of air exposition in eaeh collection data. Most Amphipoda did not show specific algal substratum colonization: only Sunampithoe pelagica occurred solely in Sargassum. Four species occurred in different branched algae: J. falcata. S. pelagica. C. danilevskii and C. penantis. H. media had Sargassum, Pterocladia, Pterosiphonia and Gymnogongrus as the best algal substrata, whereas Caprellidea, the Pterocladia and Pterosiphonia phytals. High sediment weight in Padina was the main reason for high densities of Hyale sp.l in this phytal. The occurrence of males, females (including ovigerous ones and juveniles of most Amphipoda species found in the present study indicates a complete life cycle whithin these phytals and corroborates with the assumption of the complexity of this marine coastal ecosystem.

  14. Coadaptation: lessons from the brine shrimp Artemia, "the aquatic Drosophila" (Crustacea; Anostraca Coadaptación: lecciones desde el camarón de salmuera Artemia, "la Drosophila acuática" (Crustacea; Anostraca

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    GONZALO GAJARDO

    2001-03-01

    Full Text Available During the fifties Brncic and the Dobzhansky's school, using the fruit fly Drosophila as a test organism, introduced the term integration of the genotype, or genetic coadaptation, which has had great impact on thinking in today's evolutionary biology. In this work we use the brine shrimp Artemia - in many respects a sort of aquatic Drosophila- as a model organism to evaluate the relationship between population structure, potential for divergence and the degree of morphological and/or genetic change. These aspects, tightly linked with the organization of the genotype, are important to understanding how recombination and adaptive release of genetic and phenotypic variation affect the speciation process in Artemia. Analysis of genetic (allozyme, diploid and chromocentre numbers, morphological (Mahalanobis distances and reproductive data (cross-fertility tests available for populations of the bisexual, endemic species of the Americas, Artemia franciscana and A. persimilis, indicate that: (i A. franciscana and A. persimilis are morphologically distinct in correspondence with observed genetic differences (D Nei > 1; 2n = 42 and 44; 12.5 and 1.5 mean chromocentre numbers, respectively; (ii populations from Chile and other South American localities (mainly A. franciscana display high levels of genetic variability and a trend to develop large genetic distances between populations; (iii the plasticity of Artemia gene pool is associated, at least in part, with ecological heterogeneity. Hence an adaptive divergence mode is thought to best define the speciation process in Artemia; (iv the succesful production of laboratory hybrids in the allopatric Artemia populations studied in the Americas, a feature seen in other anostracods, could be explained by the fact that formerly allopatric populations have not achieved later sympatry, as required by the allopatric speciation paradigmEn los años cincuenta Brncic y la escuela de Dobzhansky introdujeron el término integración del genotipo, o coadaptación genética, usando la mosca de la fruta Drosophila como organismo de experimentación, el cual ha tenido gran impacto en el la biología evolutiva actual. En este trabajo utilizamos al camarón de salmuera Artemia, en muchos aspectos una suerte de Drosophila acuática, como organismo modelo para evaluar la relación entre estructura poblacional, potencial de divergencia y el grado de cambio morfológico y/o genético. Estos aspectos, estrechamente ligados a la organización del genotipo, son importantes para entender como la recombinación y la liberación adaptativa de variación genética y fenotípica afectan el proceso de especiación en Artemia. El análisis de datos genéticos (aloenzimas, número diploide y de cromocentros, morfológicos (distancia de Mahalanobis y reproductivos (pruebas de fertilidad cruzada disponibles para las poblaciones bisexuales, endémicas de las Americas, Artemia franciscana y A. persimilis, indican que: (i A. franciscana y A. persimilis son morfológicamente distintas en correspondencia con las diferencias genéticas observadas (D Nei > 1; 2n = 42 y 44; 12,5 y 1,5 número promedio de cromocentros, respectivamente; (ii poblaciones de Chile y otras localidades Sudamericanas (principalmente A. franciscana exhiben altos niveles de variabilidad genética y una tendencia a desarrollar grandes distancias genéticas entre poblaciones; (iii la plasticidad del acervo de genes en Artemia está asociado, al menos en parte, con la heterogeneidad ecológica. Por este motivo el modelo de divergencia adaptativa es el que mejor define el proceso de especiación en Artemia; (iv la producción de híbridos de laboratorio entre las poblaciones alopátricas de América estudiadas, un rasgo observado también en otros anostrácodos, podría explicarse por el hecho de que poblaciones originalmente alopátricas no han logrado posterior simpatría, como requiere el paradigma de especiación alopátrico

  15. Ultraestrutura do espermatozóide de Ucides cordatus Linnaeus (Crustacea, Ocypodidae do litoral norte do Brasil Ultrastructure of spermatozoon of the crab Ucides cordatus Linaeus (Crustacea, Decapoda of the northern littoral of Brazil

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    Edilson Matos

    2000-09-01

    Full Text Available Ultrastructure of spermatozoa of the crab Ucides cordatus Linnaeus, 1763 is described and illustrated. Three parts can be distinguished: 1. the elongate-ovoid acrosome located anteriorly; 2. the cytoplasmic region; and 3. the nuclear region. The acrosome is composed of a thick electron-dense wall and a less electron-dense subacrosomal space. The cytoplasm region connects the acrosome with the nucleus, and three arms filled with microtubules arise from this region. The nucleus is polymorphous. The spermatozoon of Ucides cordatus follows the general pattern described for other Decapods.

  16. The genus Artemia Leach, 1819 (Crustacea: Branchiopoda: I. True and false taxonomical descriptions El género Artemia Leach, 1819 (Crustacea: Branchiopoda: I. Descripciones taxonómicas verdaderas y falsas

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    Alireza Asem

    2010-01-01

    Full Text Available The brine shrimp Artemia is important for aquaculture since it is bighly nutritious. It is also used widely in biological studies because it is easy to culture. The aim of the present study is to review the literature on the taxonomical nomenclature of Artemia. The present study indicates the existence of seven species: three living in the Americas, one in Europe, and three in Asia.El camarón de salmuera Artemia es importante para la acuicultura por su alta calidad nutricional y es muy utilizado para estudios biológicos por ser de fácil cultivo. El objetivo del presente estudio es revisar la literatura sobre la nomenclatura taxonómica de Artemia. Se determina la existencia de siete especies; tres de ellas viven en América, una en Europa y tres en Asia.

  17. Artemia (Crustacea, Anostraca in Chile: a review of basic and applied biology Artemia Crustacea, Anostraca en Chile: revisión de la biología básica y aplicada

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    Patricio De los Rios-Escalante

    2012-09-01

    Full Text Available The brine shrimp Artemia in Chile has been studied since the 1980s, initially on populations inhabiting shallow coastal and inland mountain ponds, and saltworks in northern and central Chile. Based on morphometric and molecular evidence, these populations were identified as A. franciscana. In the 1990s, A. persimilis was recorded from southern Patagonia, a species previously considered endemic to Argentina. Recently, two new populations of A.franciscana have been recorded, from one saline coastal pond in northern Chile and from a saltwork in central Chile. The scope for further research to increase both understanding of the strain characterization and basic population ecology descriptions of the Chilean brine shrimps and improve their conservation status is discussed. It is suggested that future studies should investigate first the management of local brine shrimp population for local aquaculture or conservation resources, other direction would be the effects of ultraviolet radiation (UVR exposition that is notoriously high in brine shrimp habitats. This last factor is very important because the UVR is an important mutagen on the genetic structure of the populations. In this scenario, it is suggest a carefully management for introduced brine shrimp populations for local aquaculture for avoid alterations in native populations that due their genetic isolation would need conservation procedures for avoid local extinctions.El camarón de salmuera o Artemia ha sido estudiado en Chile desde la década de 1980, las primeras descripciones de poblaciones fueron para lagunas someras en zonas costeras y de montana, y en salinas artificiales en la zona central y norte de Chile. Sobre la base de evidencias morfométricas y moleculares estas poblaciones fueron descritas como A. franciscana. En la década de 1990, se describió la presencia de A. persimilis en la zona sur de la Patagonia, lo cual fue una ampliación del rango de distribución significativa, pues esta especie se le consideró endémica de Argentina. Recientemente dos nuevas poblaciones de A. franciscana fueron reportadas en una laguna somera en el norte y para una salina artificial en la zona central. El objetivo del presente estudio fue realizar una investigación para entender la caracterización de poblaciones y ecología básica de las poblaciones chilenas del camarón de salmuera y discutir como mejorar el estado de la conservación de estas. Se discute que a futuro los estudios se deberían enfocar primero al manejo de poblaciones nativas para acuicultura local o como un recurso para su conservación, otras orientaciones de estudio, podrían ser los efectos de la radiación ultravioleta (UVR que es notoriamente alta en los hábitats del camarón de salmuera. Este último factor es importante porque la radiación ultravioleta es un agente mutágeno importante en la estructura genética de las poblaciones. En este escenario, se sugiere un manejo cuidadoso de las poblaciones introducidas del camarón de salmuera para la acuicultura local, con el fin de evitar alteraciones en las poblaciones nativas que debido a su aislamiento genético necesitarían procedimientos para su conservación con el fin de evitar extinciones locales.

  18. Biologia reprodutiva de Talitroides topitotum (Burt (Crustacea, Amphipoda, Talitridae na Serra do Mar, Guaratuba, Paraná, Brasil Reproductive biology of Talitroides topitotum (Burt (Crustacea, Amphipoda, Talitridae from Serra do Mar, Guaratuba, Paraná, Brazil

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    Odete Lopez Lopes

    2004-12-01

    Full Text Available Uma análise da distribuição do comprimento do corpo e da correlação entre a fecundidade e o comprimento do corpo foi realizada em uma população do anfípodo terrestre Talitroides topitotum (Burt, 1934 no entorno da Usina Hidroelétrica de Guaricana, Serra do Mar, Guaratuba, Estado do Paraná, Brasil. Os anfípodos foram coletados com redes de Malaise erguidas em meio à Floresta Ombrófila, mensalmente, de junho de 1985 a junho de 1986. Um total 2191 anfípodos foi coletado, dos quais 1626 fêmeas com oostegitos, mas sem ovos no marsúpio, 558 fêmeas ovígeras, seis juvenis e um adulto sem caracteres sexuais secundários. Nenhum macho foi obtido. Os ovos contidos no marsúpio das fêmeas foram contados. O comprimento do corpo dos anfípodos foi obtido através de imagens fotografadas com o animal em decúbito lateral. Fêmeas maturas somaram 98,54% da população amostrada. O comprimento do corpo dos juvenis variou de 2,88 a 5,97 mm, enquanto o das fêmeas maturas (incluindo as ovígeras de 7,00 a 14,43 mm, sendo este valor máximo, o maior registrado até o presente para a espécie. A classe modal das fêmeas maturas sem ovos no marsúpio foi 8,50 mm, ao passo que a das fêmeas ovígeras, a de 9,50 mm. Fêmeas ovígeras estiveram presentes durante todo o ano, em percentual que variou de 8 a 40%; na distribuição da freqüência relativa, foram observados quatro picos (julho, outubro e dezembro de 1985 e março de 1986.An analysis of the body length distribution and correlation between the fecundity and body length was carried out in a population of the terrestrial amphipod Talitroides topitotum (Burt, 1934 from the neighborhood of Hydroelectric Plant of Guaricana, Serra do Mar, Guaratuba, State of Paraná, Brazil. The amphipods were collected with Malaise nets erected inside a Tropical Rain Forest, monthly, from June, 1985 to June, 1986. A total of 2191 amphipods were collected, from which 1626 females with oostegits but without eggs in the marsupium, 558 ovigerous females, 6 juveniles and an adult without any secondary sexual characters. No male was obtained. The eggs inside the female marsupium were counted. The body length of the amphipods was obtained through photographed images of the animals in lateral decubitus. Mature females summed 98.54% of the sampled population. The body length of the juveniles varied from 2.88 to 5.97 mm and that of mature females (including ovigerous ones from 7.00 to 14.43 mm up to the present, this is the larger, with the modal class of the mature females in 8.50 mm class and that of ovigerous in 9.50 mm class. The non-ovigerous females presented shorter body length than the ovigerous ones. Ovigerous females were present all year round, which percentage ranged from 8 to 40%; four peaks were observed (July, October, and December, 1985, and March, 1986 in relative frequency distribution. Fecundity varied from 1 to 10 eggs per female; mean of 3.34 per female. In spite of the linear tendency of the regression between fecundity and body length the correlation was very weak (r = 0.5675, p < 0.05. The adult population of T. topitotum from Guaricana can be characterized by number of pulses (four of ovigerous females during the year and by the absence of males.

  19. The distribution of littoral caprellids (Crustacea: Amphipoda: Caprellidea along the Pacific coast of continental Chile La distribución de caprélidos litorales (Crustacea: Amphipoda: Caprellidea en la costa del Pacífico de Chile continental

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    MARTIN THIEL

    2003-06-01

    Full Text Available Many littoral caprellid species have a very ample distribution, some having been reported from all over the world. The cosmopolitan distribution of many littoral caprellid species might be facilitated by the fact that they are often associated with fouling communities on floating objects, which have a high potential of far-range dispersal. This dispersal potential may also have implications for the distribution of caprellids on local and regional scales. Herein we examined the distribution of littoral caprellid species on two spatial scales, local (tens of kilometers and regional (hundreds of kilometers along the Pacific coast of continental Chile. On the local scale, we studied the caprellid fauna in different habitats (intertidal boulders, subtidal algal and seagrass beds, fouling community on buoys and ropes; on the regional scale we focused only on caprellids associated with the fouling community on buoys and ropes. We found a total of six caprellid species, some of which were very abundant both on the local as well as on the regional scale. On the local scale we found a difference between the three studied habitat types with respect to the assemblage of caprellid species, some of which were found in more than one habitat. The highest species richness and abundance of caprellids was found in the fouling community associated with anchored buoys and ropes. On the regional scale we found very high numbers of caprellids in the fouling community of the northern region (n of 30°S, and decreasing abundances and species richness in the central region (30-37° S. No caprellids were found in the southern region of the study area (37-42° S. This pattern coincides with the global distribution of littoral caprellid species, which are most abundant and diverse at low latitudes but occur in low abundances and low diversity at high latitudes. Detached buoys that were found a few km off the coast harbored similar caprellid assemblages (including ovigerous females as anchored buoys, suggesting that buoys and other floating substrata (litter, macroalgae may facilitate dispersal of caprellids (and other epibiota along the Pacific coast of Chile. Since artificial and natural floating substrata are also abundant at high latitudes it is inferred that the low diversity of littoral caprellids at high latitudes is not due to lack of dispersal vectors, but rather of other factorsMuchas especies de caprélidos del litoral presentan una amplia distribución, algunas han sido citadas a lo largo de todo el mundo. La distribución cosmopolita de muchas especies de caprélidos podría deberse al hecho de que se asocian frecuentemente a las comunidades "fouling" en objetos flotantes, que presentan una capacidad importante de dispersión a largas distancias. Esta capacidad de dispersión puede tener implicaciones en la distribución de caprélidos a escala local y regional. En este estudio, nosotros examinamos la distribución de las especies de caprélidos litorales en dos escalas espaciales, local (decenas de kilómetros y regional (cientos de kilómetros, a lo largo de la costa Pacífico de Chile continental. A escala local se estudió la fauna de caprélidos en distintos hábitats (bolones intermareales, praderas de algas y fanerógamas marinas, comunidades "fouling" de boyas y cuerdas; a escala regional el estudio se centró solamente en los caprélidos asociados a boyas y cuerdas. Se encontraron un total de seis especies de caprélidos, algunos de los cuales fueron muy abundantes a escala local y regional. A escala local, existió una diferencia entre los tres tipos de hábitat con respecto a la fauna de caprélidos, algunos de los cuales estuvieron presentes en más de un hábitat. Los valores más altos de riqueza específica y abundancia se encontraron en la comunidad "fouling" asociada a boyas y cuerdas ancladas. A escala regional, los caprélidos fueron más abundantes y diversos en las comunidades "fouling" de la región norte (n de 30° S, mientras que la abundancia y riqueza de especies disminuyeron en la región central (30-37° S. No se encontraron caprélidos en la región sur del área de estudio (37-42° S. Este patrón coincide con la distribución global de especies de caprélidos litorales, mostrando los valores más altos de abundancia y riqueza de especies en las bajas latitudes y los valores más bajos en las altas latitudes. Boyas desprendidas desde sus amarras y encontradas a varios km de la costa albergaron asociaciones de caprélidos (incluyendo hembras ovígeras similares a las de las boyas fijadas, sugiriendo que las boyas y otros sustratos flotantes pueden facilitar la dispersión de caprélidos (y otra epifauna a lo largo de la costa Pacífico de Chile. Teniendo en cuenta que los sustratos flotantes naturales y artificiales son también abundantes en altas latitudes se infiere que la baja diversidad de caprélidos litorales en altas latitudes no se debe a la falta de vectores dispersantes sino a otros factores

  20. Anfípodos hiperídeos (Crustacea: Peracarida del Parque Nacional Isla del Coco, Costa Rica, Pacífico Tropical Oriental Hyperiid amphipods (Crustacea: Peracarida of the Parque Nacional Isla del Coco, Costa Rica, Eastern Tropical Pacific

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    Rebeca Gasca

    2012-11-01

    Full Text Available Los anfípodos hiperídeos son uno de los grupos de crustáceos pelágicos más frecuentemente encontrados y están entre los más diversos del zooplancton marino. Para determinar la composición de especies de anfípodos hipéridos que habitan las aguas alrededor del Parque Nacional Isla del Coco, Costa Rica, se analizaron 12 muestras de zooplancton. Estas fueron recolectadas mediante arrastres verticales y horizontales con una red de plancton con mallas de 200 y 500 micras y 49cm de diámetro en la boca. Se encontró un total de 22 especies pertenecientes a 17 géneros y 12 familias. Se presenta el listado faunístico de este grupo junto con datos acerca de su taxonomía, su distribución en el área de estudio y su distribución general. La mayor parte de las especies registradas en esta zona han sido reportadas en estudios previos referentes a la región del Pacífico Tropical Oriental y en particular en aguas oceánicas de Costa Rica. Encontramos ocho especies que representan nuevos registros para aguas del Pacífico costarricense, lo que incrementa en un 26% (a 38 el número de especies de hipéridos conocidos en Costa Rica. Las especies más frecuentes fueron Lestrigonus shoemakeri, L. bengalensis, Hyperioides sibaginis y Phronimosis spinifera. Se espera que muestreos adicionales tanto de aguas superficiales como profundas expandan el conocimiento de la diversidad del grupo en esta área protegida.Hyperiid amphipods are one of the most frequently encountered pelagic crustaceans and among the most diverse marine zooplankters. To determine the species composition of the hyperiid amphipods dwelling in the waters around Isla del Coco National Park, Pacific Costa Rica, we analyzad 12 zooplankton samples, collected by vertical and horizontals tows with plankton net with mesh sizes of 200 and 500 microns and 49cm mouth diameter. We recorded a total of 22 species belonging to 17 genera and 12 families. A faunistic list of this group is provided together with data on their taxonomy and their distribution both in the surveyed area and in general. Most of the species recorded in this zone have been reported in previous surveys in the Eastern Tropical Pacific region and particularly in oceanic waters of Costa Rica. We found eight species representing new records for Costa Rican waters, thus increasing by 26% (to 38 the number of hyperiid species known from Costa Rica. The most frequent species were Lestrigonus shoemakeri, L. bengalensis, Hyperiodes sibaginis, and Phronimopsis spinifera. We expect that additional samplings both from surface and deep waters will expand the knowledge of the diversity of the group in this important protected area.

  1. Crescimento somático do caranguejo-uçá Ucides cordatus (Crustacea, Brachyura, Ocypodidae em laboratório Somatic growth of the mangrove crab Ucides cordatus (Crustacea, Brachyura, Ocypodidae in laboratory

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    Giovana V. Lima

    Full Text Available Em crustáceos, o aumento de tamanho ocorre imediatamente após a muda, quando o animal está com a carapaça mole. O crescimento de Ucides cordatus (Linnaeus, 1763 foi observado em laboratório, através da ocorrência de muda, incremento de muda e período de intermuda. O estudo foi realizado durante os meses de outubro/2000 a março/2002 e um total de 91 caranguejos (15 machos, 33 fêmeas e 43 juvenis foi coletado no manguezal de Itacuruçá - Coroa Grande, Estado do Rio de Janeiro, Brasil. Os animais foram mantidos em dois tipos de tanques: os caranguejos adultos foram mantidos em tanques de 1000 l, durante 18 meses, enquanto os juvenis foram mantidos em tanques plásticos de 20 l de capacidade durante oito meses. Os animais foram mantidos em sistema aberto de circulação de água do mar e alimentados duas vezes por semana com folhas de Rhizophora mangle (L. (Rhizophoraceae e Laguncularia racemosa (Gaertn. (Combretaceae. A largura da carapaça variou entre 50,1 a 70,0 mm nos machos, 40,2 a 80,0 mm entre as fêmeas e 1,1 a 40,1 mm entre os juvenis. A sobrevivência dos espécimes estudados foi de 46,7% entre os machos, 39,4% entre as fêmeas após dezoito meses e 67,4% entre os juvenis, após oito meses de observação. Os machos e as fêmeas realizaram três mudas durante o experimento, enquanto os juvenis realizaram até duas mudas. As mudas ocorreram entre agosto e abril, mostrando maior freqüência durante a primavera e o verão. O incremento na largura da carapaça diminuiu com o tamanho do indivíduo, com média de 2,21 ± 1,39% para os machos, 1,28 ± 0,84% para as fêmeas e 2,89 ± 2,13% para os juvenis. A relação entre o incremento percentual e a largura da carapaça pode ser expresso pela equação IM = -0.0707LC + 4.645 (r²= 0.40. O período de intermuda foi de 191 ± 140 dias entre os machos, 216 ± 76,2 dias entre as fêmeas e 54 ± 1,41 dia entre os juvenis. O incremento de muda foi estatisticamente significativo (pIn crustaceans, size increase occurs only immediately after molting when the animal is in the soft-shelled condition. The growth of Ucides cordatus (Linnaeus, 1763 was observed in laboratory, through its occurrence of molt, percentual increment of size and intermolt period. The study was realized from October/2000 to March/2002 and a total of 91 crabs (15 males, 33 females and 43 juveniles were sampled in Itacuruçá - Coroa Grande mangrove, State of Rio de Janeiro, Brazil. The animals were maintained in two types of containers: adult crabs were kept in containers of 1000 l capacity, during eighteen months; while the juveniles were kept in plastic containers of 20 l capacity during eight months. The crabs were maintained in flowing seawater and fed on frozen leaves of Rhizophora mangle (L. (Rhizophoraceae and Laguncularia racemosa (Gaertn. (Combretaceae, twice a week. The carapace width ranged from 50.1 to 70.0 mm in males, 40.2 to 80.0 mm to females and 1.1 to 40.1 mm to juveniles. The survival rate of the specimens studied was of 46.7% for males, 39.4% for females after eighteen months and 67.4% for juveniles after eight months. The males and females molted up to three times during the experiment, while the juveniles molted up twice. Molts occurred between August and April, showing more frequency during spring and summer. The increment of carapace width decreased with size, with mean was 2.21 ± 1.39% for males, 1.28 ± 0.84% for females and 2.89 ± 2.13% for juveniles. The relationship between the percentual increment and the carapace width can be expressed by the equation IM = -0.0707LC + 4.645 (r²= 0.40. The intermolt period was 191 ± 140 days for males, 216 ± 76.2 days for females and 54 ± 1.41 days for juveniles. The percentual increment of size was statistically significant (p<0,05 when compared males and females, and adults and juveniles.

  2. Idade e crescimento de Callinectes danae e C. ornatus (Crustacea, Decapoda na Baía de Guanabara, Rio de Janeiro, Brasil Age and growth of Callinectes danae and C. ornatus (Crustacea, Decapoda in Guanabara Bay, Rio de Janeiro, Brazil

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    Karina A. Keunecke

    2008-06-01

    Full Text Available Callinectes danae Smith, 1869 e C. ornatus Ordway, 1863 constituem uma parcela importante da produção pesqueira na Baía de Guanabara. Ambas espécies compõem uma fração significativa da fauna-acompanhante sendo exaustivamente descartadas pelas pescarias de arrasto de camarões na costa brasileira. As curvas de crescimento de C. danae e C. ornatus foram calculadas por meio da análise de progressão modal. Para estimar os parâmetros biológicos, foi aplicado o modelo de crescimento de Bertalanffy e para estimar a longevidade foi usada a sua fórmula inversa. As curvas de crescimento foram: ♂ LC = 120 (1 - e -0,005t , ♀ LC = 113 (1 - e -0,005t; ♂ LC = 94 (1 - e -0,005t e ♀ LC = 110 (1 - e -0,005t , respectivamente para C. danae e C. ornatus. A longevidade alcançada para as duas espécies foi em torno de 2,5 anos, além de validar as curvas de crescimento. O estudo do crescimento em crustáceos é de extrema importância, pois além de fornecer a informação biológica básica para o grupo, os parâmetros estimados subsidiam o ordenamento e manejo pesqueiro das espécies exploradas.Callinectes danae Smith, 1869 and C. ornatus Ordway, 1863 constitute an important portion from the fishing products at Guanabara Bay. Both species compose a significant by-catch fraction being a lot discarded during shrimp trawlings along Brazilian coast. Growth curves were estimated by modal progression analysis. For the biological parameters it was applied the Bertalanffy growth function and for the age it was used its inverse formula. Growth curves of C. danae and C. ornatus were respectively: ♂ LC = 120 (1 - e -0,005t, ♀ LC = 113 (1 - e -0,005t; ♂ LC = 94 (1 - e -0,005t and ♀ LC = 110 (1 - e -0,005t. The age for both species reached around 2.5 years, besides to confirm growth curves. Growth study in crustaceans is very important, because besides supplying biological information it subsidizes fishery management for exploted species.

  3. Aspectos reprodutivos de Goniopsis cruentata (Latreille (Crustacea, Brachyura, Grapsidae na Baía de Sepetiba, Rio de Janeiro, Brasil Reproductive aspects of Goniopsis cruentata (Latreille (Crustacea, Brachyura, Grapsidae at the Sepetiba Bay, Rio de Janeiro, Brazil

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    Zilanda de Souza Silva

    2002-09-01

    Full Text Available The objective of this study was to get some knowledge about the reproductive aspects of Goniopsis cruentata (Latreille, 1803, concerning through sex ratio, morphological sexual maturity, reproductive period, fecundity and eggs size. The crabs were collected monthly in Itacuruçá's Mangroves from November, 1997 to November, 1998. Four hundred and seven crabs were caught and they were 47% males, 36% females and 17% ovigerous females. The sex ratio was 1:1.13 (male:female (X²= 1.54, p > 0.05. The relation of abdomen width (AW and carapace width (CW in females showed a positive allometric grow (b = 1.36, it suggests the size onset of maturity occur from 26.0 a 29.0 mm (CW in females. The ovigerous females occured during all the research period, except for the winter months (June to August. The size of these ovigerous females varied from 26.0 to 48.8 mm with mean size 35.1 + 5.2 mm. Individual fecundity varied from 29,975 to 142,050 eggs and mean fecundity was 74,751 ± 27 eggs. The mean diameter of the eggs was 300 ± 20 µm.

  4. Biologia populacional de Emerita brasiliensis Schmitt (Crustacea, Hippidae na Praia Vermelha do Norte, Ubatuba (São Paulo, Brasil Population biology of Emerita brasiliensis Schmitt (Crustacea, Hippidae in Vermelha do Norte beach, Ubatuba (São Paulo, Brazil

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    Jelly Makoto Nakagaki

    1999-01-01

    Full Text Available Emerita brasiliensis Schmitt, 1935 is a common mole crab called "tatuíra" in Brazil, with distribution from Espírito-Santo State (Brazil to Buenos Aires Province (Argentina. Specimens were collected bimonthly from May/1992 through March/1993 with 4mm siffers mesh, in the intertidal region at Vermelha do Norte Beach, Ubatuba, São Paulo, Brazil. The animals were sexed and measured with a precision caliper of 0.1 mm (Cl = carapace length. Males presented cl amplitude from 3.4-17.3mm (13.2±2.1mm, and females from 13.8-26.3mm (20.5±1.8mm, showing a well-defined sexual dimorfism for this variable. The population presented a smaller incidence of males in relation to females (0.54:1.00, however in May/1992 an inverse pattern occurred (1.84:1.00. Ovigerous females were present in all samples with exception of May and September/1992 with greater frequencies in July/1992 and January/1993. It is probable that female maturity occurs is reached with 17mm CL, the smallest size in wich ovigerous females were found.

  5. Maturidade sexual do caranguejo Armases rubripes (Rathbun (Crustacea, Brachyura, Sesarmidae na Baía de Sepetiba, Rio de Janeiro, Brasil Sexual maturity of the crab Armases rubripes (Rathbun (Crustacea, Brachyura, Sesarmidae in Sepetiba Bay, Rio de Janeiro, Brazil

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    Giovana V. Lima

    2006-12-01

    Full Text Available Objetivou-se analisar a maturidade sexual de Armases rubripes (Rathbun, 1897 em três diferentes ambientes (rio, praia arenosa e manguezal no sudeste do Brasil. Os caranguejos foram coletados mensalmente de julho/2002 a fevereiro/2004, utilizando-se peneiras no Rio Sahy durante as marés altas e, manualmente, na praia e no manguezal, durante as marés baixas. Os animais foram capturados por dois coletores num esforço de 15 minutos por estação de coleta. No laboratório, os exemplares foram separados por sexo e mensurados em relação a largura da carapaça, do abdome e comprimento do gonopódio. As gônadas, gonopódios e o abdome foram analisados segundo sua forma e seu aspecto. Um total de 4.051 indivíduos foram amostrados (1.067 machos, 1.563 fêmeas e 1.421 juvenis. Foram determinados cinco morfotipos: juvenis, machos imaturos, fêmeas imaturas, machos maduros e fêmeas maduras. O início da maturidade sexual fisiológica e morfológica ocorreu de forma assíncrona, com machos produzindo gametas mais cedo que as fêmeas. O tamanho da primeira maturidade sexual apresentou diferença significativa entre os ambientes analisados, exceção observada para o manguezal. Os indivíduos obtidos no manguezal apresentaram menores tamanhos para o início da maturidade sexual. Embora, estimados os tamanhos da maturidade sexual morfológica de machos e fêmeas, a análise do crescimento alométrico foi inadequado para a espécie.The present study analyzed the sexual maturity of Armases rubripes (Rathbun, 1897 in three populations from different environmental conditions (river, beach and mangrove in the southeastern Brazilian coast. Crabs were sampled monthly from July 2002 to February 2004; they were captured with sieves at Sahy River, during the high tides, and by hand at beach and mangrove areas, during low tides. Animals were captured by establishing a catch effort of two collectors during 15 minutes for each station. At laboratory, all individuals were sexed and the carapace width measured. The gonads, gonopods and abdomen morphology were observed according to shape and macroscopic aspects. A total of 4,051 specimens were sampled (1,067males, 1,563 females and 1,421 juveniles. There were recognized five morphotypes: juveniles, immature males, immature females, mature males and mature females. The onset of physiological and morphological sexual maturity was asynchronous within sexes, of which, males reaching the ability to produce gametes earlier than females. The size at the onset of sexual maturity was significantly different among populations different coming from areas, except for mangrove area. The individuals obtained from mangrove showed the shortest size at the onset of sexual maturity. Therefore, estimates of males and females sizes at morphological sexual maturity the allometric growth analyses are inadequate in this species.

  6. Ecologia populacional de Aegla franciscana (Crustacea, Decapoda, Anomura em São Francisco de Paula, RS, Brasil Population ecology of Aegla franciscana (Crustacea, Decapoda, Anomura from São Francisco de Paula, RS, Brazil

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    Raoní da Silva Gonçalves

    2006-03-01

    Full Text Available A pesquisa teve como objetivos caracterizar aspectos populacionais de Aegla franciscana Buckup & Rossi, 1977 que ocorre em corpos d'água do planalto sul-rio-grandense, onde foram analisados a distribuição de freqüência em classes de tamanho, a proporção sexual, o período reprodutivo através da freqüência de fêmeas ovígeras, o recrutamento e a fecundidade da espécie. As amostragens foram realizadas sazonalmente, no arroio Rolante, município de São Francisco de Paula, RS. Os eglídeos foram coletados com puçás, medidos e devolvidos ao arroio. Foram amostrados 1.322 exemplares, sendo 567 machos, 579 fêmeas e 176 animais com sexo indefinido. Machos e fêmeas foram agrupados em classes de comprimento do cefalotórax (CC, onde foi observada distribuição bimodal. A amplitude do comprimento do cefalotórax dos machos variou de 3,86 mm a 22,09 mm e o das fêmeas de 4,06 mm a 22,48 mm, sendo que os machos apresentaram tamanho mediano (10,36 mm superior ao das fêmeas (9,89 mm. A proporção sexual foi de 1:1 (chi2 = 0,03; p>0,05. Na análise da proporção sexual, por classes de tamanho, observou-se que os machos são mais freqüentes nas classes superiores e as fêmeas nas classes intermediárias. O primeiro registro do surgimento de juvenis na população ocorreu no verão e de fêmeas ovígeras no outono, estas ocorrendo mais freqüentemente no inverno. As fêmeas ovígeras produzem em média 123,3 ± 47,8 ovos; observou-se correlação entre o comprimento do cefalotórax das fêmeas ovígeras e o número de ovos (r = 0,81.The aim of this research was to characterize population aspects of Aegla franciscana Buckup & Rossi, 1977, where the size-frequency distribution, sex ratio, recruitment, reproductive period (frequency of ovigerous females and fecundity were evaluated. The samples were performed seasonally (February, June, August and October 2003 at river Rolante, Rio dos Sinos basin, São Francisco de Paula city, RS. The animals were collected with nets, measured and returned to the stream. A total of 1,322 individuals was obtained, among which 567 males, 579 females and 176 unsexed animals. The animals were bracketed in size classes for cephalothorax length (CL, and bimodal distribution was observed. Male sizes ranged from 3.86 mm to 22.09 mm and females from 4.06 mm to 22.48 mm. The males showed a larger median size (10.36 mm than females (9.89 mm. The sex ratio obtained was close to 1:1 (chi2 = 0.03; p>0.05. Sex ratio in the size classes showed an anomalous pattern, with a higher frequency of females in the intermediate size classes and males in the superior classes. This may be related to a greater energy requirement for reproduction in females, thus delaying growth. The highest recruitment pulse occurred in summer and autumn as a consequence of high reproductive activity during winter. Ovigerous females produced 123.3 ± 47.8 eggs (mean ± standard deviation. A correlation between cephalothorax length of ovigerous females and number of eggs (r = 0.81 was observed.

  7. Lista actualizada y clave ilustrada para los géneros de misidáceos (Crustacea, Peracarida del Mar Intra-Americano Updated checklist and illustrated key to mysid (Crustacea, Peracarida genera from the Intra-American Sea

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    Manuel Ortiz

    2012-12-01

    Full Text Available Se presenta una lista actualizada y una clave ilustrada para la identificación de los 38 géneros marinos, estuarinos y estigobios de los misidáceos que habitan en el Mar Intra-Americano. Estos crustáceos incluyen 6 familias, 5 subfamilias y 5 tribus dentro de los órdenes Lophogastrida y Mysida. El primero contiene 5 géneros y el segundo 33; de éstos, 35 habitan el ambiente marino y el salobre, 2 el cárstico y 1, Antromysis, vive en cualquiera de los 3 ambientes. Los géneros Anchialina, Siriella, Mysidopsis, Mysidium y Heteromysis se distribuyen ampliamente en todo el Mar Intra-Americano. Contrariamente a Chalaraspidum, Euchaetomera, Eucopia, Gironomysis, Metamblyops, Mysidella, Palaumysis, Platymysis, Pleurerythrops, Pseudomma y Synerythrops con una distribución geográfica restringida. El Mar Caribe y el Golfo de México representan las 2 regiones biogeográficas con mayor número de géneros de misidáceos.An updated checklist and an illustrated key for the identification of the 38 genera of marine, estuarine and stygobitic opossum shrimps recorded from the Intra-American Sea, are presented. These crustaceans were included in 6 families, 5 subfamilies, and 5 tribes, into the suborders Lophogastrida and Mysida. First order grouped 5 genera and the second 33. Of these genera, 35 live in marine and estuarine environments, 2 are stygobitic and another, Antromysis, is distributed in each one. The genera Anchialina, Siriella, Mysidopsis, Mysidium and Heteromysis have a wide distribution in overall Intra-American Sea, instead of Chalaraspidum, Euchaetomera, Eucopia, Gironomysis, Metamblyops, Mysidella, Palaumysis, Platymysis, Pleurerythrops, Pseudomma and Synerythrops with a restricted geographical distribution. The Caribbean Sea and the Gulf of Mexico constitute the regions with the biggest number of mysids genera.

  8. Lista anotada de los isópodos acuáticos epicontinentales de México (Crustacea: Isopoda Annotated list of the aquatic epicontinental isopods of Mexico (Crustacea: Isopoda

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    Arturo Rocha-Ramírez

    2009-12-01

    Full Text Available El presente trabajo integra una lista de especies de crustáceos isópodos acuáticos continentales de México con referencias taxonómicas originales, sinonimias, localidades tipo y distribución. El listado comprende un total 6 familias que agrupan 49 especies, de las cuales sólo 10 son epigeas, mientras que las 39 restantes son hipogeas registradas en manantiales termales y cuevas de los sectores oriental y centro del país, así como en cenotes de los estados de Yucatán y Quintana Roo. Los grupos más diversificados en México son cirolánidos y asélidos, que se encuentran tanto en aguas superficiales como en hábitats hipogeos. La región geográfica con mayor número de especies es el noreste, de Chihuahua a Tamaulipas, en tanto que carecen de registros toda la vertiente del Pacífico y algunos estados del centro y sur del país. Con base en los registros existentes se discute el patrón de distribución y se sugieren 4 áreas de concentración de especies en México. Se hace un análisis del estado de conservación de los isópodos acuáticos de México. Existe una notable asimetría entre la rareza y la vulnerabilidad de la mayoría de las especies y el grado de protección que se les asignó dentro de los instrumentos de conservación del gobierno mexicano.The present contribution integrates a species list of the aquatic isopods found in continental waters of Mexico with original taxonomic references, synonymies, type locality, and distributional data. The list comprises six families and 49 species, ten of which are epigean while the remaining 39 are hypogean, recorded from thermal springs and caves in the central and eastern portions of the country, and from cenotes in the states of Yucatan and Quintana Roo. The cirolanids and asellids are the most diversified groups in Mexico, in both surface and subterranean waters. While the most species rich area is the northeast, from Chihuahua to Tamaulipas, the entire Pacific slope along with some central and southern states lack records of aquatic isopods. Based on the existing records, the distribution pattern is discussed and the existence of four main areas of distribution is proposed. The conservation status of the aquatic isopods in Mexican continental waters is examined. A notable asymmetry is present between the rarity and vulnerability of most species and the level of protection was assigned for them by the Mexican government conservation agencies.

  9. Morphometric differences in two calanoid sibling species, Boeckella gracilipes and B. titicacae (Crustacea, Copepoda Diferencias morfométricas en dos especies hermanas Boeckella gracilipes y Boeckella titicacae (Crustacea, Copepoda

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    Patricio De los Ríos Escalante

    2012-12-01

    Full Text Available Calanoid copepods are abundant in South American inland waters and include widespread species, such as Boeckella gracilipes (Daday, 1902, which occurs from the Ecuador to Tierra del Fuego Island. This species occurs under various environmental conditions, and is found in oligotrophic lakes in Patagonia (39-54°S and in shallow mountain lakes north of 39°S. The aim of the present study is to conduct a morphometric comparison of male specimens of B. titicacae collected in Titicaca and B. gracilipes collected in Riñihue lakes, with a third population of B. gracilipes collected in shallow ponds in Salar de Surire. Titicaca and Riñihue lakes are stable environments, whereas Salar de Surire is an extreme environment. These ponds present an extreme environment due to high exposure to solar radiation and high salinity levels. The results of the study revealed differences among the three populations. These results agree well with systematic descriptions in the literature on differences between the populations of Titicaca and Riñihue lakes, and population of Salar de Surire differs slightly from the other two populations. It is probable that the differences between the population of Salar de Surire and the other two populations result from the extreme environment in Salar de Surire. High exposure to solar radiation, high salinity and extreme variations in temperature enhance genetic variations that are consequently expressed in morphology.Los copépodos calanoideos son abundantes en aguas continentales sudamericanas e incluyen especies de amplia distribución geográfica como Boeckella gracilipes (Daday, 1902 que se encuentra desde Ecuador hasta la isla de Tierra del Fuego. Esta especie vive bajo varias condiciones ambientales, y se encuentra en lagos oligotróficos en la Patagonia (39-54°S y en lagunas superficiales de montaña al norte de los 39°S. El objetivo del presente trabajo es realizar un estudio comparativo morfométrico de machos de B. titicacae colectado en el lago Titicaca y B. gracilipes colectado en el lago Riñihue, ambos son ambientes estables, con una tercera población colectada en lagunas superficiales en el Salar de Surire. Estas lagunas tienen condiciones ambientales extremas debido a alta exposición a la radiación solar y altos niveles de salinidad. Los resultados del presente estudio encontraron diferencias entre las tres poblaciones. Estos resultados concordarían con las descripciones sistemáticas en la literatura sobre las diferencias de las poblaciones de los lagos Titicaca y Riñihue, y la población del salar de Surire tuvo leves diferencias respecto a las dos poblaciones anteriores. Es probable que las diferencias entre la población del Salar de Surire y las otras dos se deban a alta exposición a la radiación solar, salinidad y condiciones extremas de temperatura que acelera las diferencias genéticas las que se expresan en diferencias morfológicas.

  10. Fertilidade do caranguejo de mangue Ucides cordatus (Linnaeus (Crustacea, Brachyura, Ocypodidae, em Iguape (São Paulo, Brasil Fertility of the mangrove crab Ucides cordatus (Linnaeus (Crustacea, Brachyura, Ocypodidae, at Iguape (São Paulo, Brazil

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    Gustavo Yomar Hattori

    2003-06-01

    Full Text Available A total of 58 Ucides cordatus (Linnaeus, 1763 ovigerous females in final embryonic stage were collected in mangrove forest at Iguape (São Paulo. Each female were kept in laboratory until the larvae hatching and had their carapace width (CW measured with caliper (0.05 mm and the larval number (LN calculated by volumetric method. The hatching rates (HR were calculated for each animal's size class (5 mm. The values of LN and CW obtained were subjected to regression analyses and the best fitting model was chosen by comparing the obtained determination coefficients (R². The fertility varied from 71,200 to 220,800 larvae (147,169 ± 32,070 larvae, corresponding to 41.7 to 76.8 mm CW (63.7±7.9 mm, respectively. The relationship LNxCW was expressed by the equation LN = 284.1CW1.5º¹ (N = 58; R² = 0.74; p < 0.01, that showed a positive correlation between the variables. Most part of ovigerous females (89.7% showed their hatching during the nightly period. A negative correlation between HR and CW was observed in these animals (p < 0.05, probably due to reduction of spermatophores in the seminal receptacle (multiparous females or due to senility in the females with large size. The biological studies of U. cordatus are very important for practices adoption that preserve and make the rational use of this recourse in Brazilian's mangrove forests.

  11. Condition factor of Goniopsis cruentata (Crustacea, Brachyura, Grapsidae from Mundaú/Manguaba estuarine complex, Alagoas, Brazil Fator de condição de Goniopsis cruentata (Crustacea, Brachyura, Grapsidae do complexo estuarino Mundaú/Manguaba, Alagoas, Brasil

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    José J. P. R. Lira

    2012-09-01

    Full Text Available The condition factor is a parameter which acts as a general indicator of the "well-being" of a species, and it can be obtained through the analysis of width vs. weight relationships. The present work aims to investigate size vs. weight relationship and the condition factor of the crab Goniopsis cruentata (Latreille, 1803. The study area was the Mundaú/Manguaba estuarine complex, Maceió, state of Alagoas, Northeast Brazil. Samplings were monthly accomplished from August 2007 to July 2008. A total of 626 individuals were analyzed, being 309 males and 317 females. Males were larger and heavier than females, what is expected in many brachyuran. The growth was positive allometric to both males (b = 3.42 and females (b = 3.30, not obeying the "cube law". The condition factor of female was higher than that of male crabs, probably due to the gonad weight of females. It also varied seasonally for both sexes, being higher in the autumn and winter in males, and in the autumn and spring in females, and related to the molt and period of spawning intensification.O fator de condição é um parâmetro que age como um indicador geral do "bem-estar" de uma espécie e pode ser obtido através da análise da relação largura-peso. O presente trabalho visa investigar a relação tamanho vs. peso e o fator de condição do caranguejo Goniopsis cruentata (Latreille, 1803. A área de estudo foi o complexo estuarino Mundaú/Manguaba, Maceió, estado de Alagoas, Nordeste do Brasil. As amostragens foram realizadas mensalmente de agosto de 2007 a julho de 2008. Um total de 626 indivíduos foi analisado, sendo 309 machos e 317 fêmeas. Os machos foram maiores e mais pesados que as fêmeas, o que é esperado em muitas espécies de braquiúros. O crescimento foi alométrico positivo tanto para machos (b = 3,42 quanto para fêmeas (b = 3,30, não obedecendo a "regra do cubo". O fator de condição da fêmea foi maior do que o dos machos, provavelmente devido ao peso das gônadas das fêmeas. O fator de condição também variou sazonalmente para ambos os sexos, sendo mais elevado no outono e no inverno nos machos, e no outono e primavera nas fêmeas, e estando relacionado à muda e ao período intenso de desova.

  12. Efeito da densidade populacional sobre as curvas de crescimento de Macrobrachium rosenbergii (De Man em cultivo semi-intensivo (Crustacea, Palaemonidae The effect of stocking density on Macrobrachium rosenbergii (De Man growth curves in earthen ponds (Crustacea, Palaemonidae

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    Wagner Cotroni Valenti

    1993-01-01

    Full Text Available In this article the length growth curves of Macrobrachium rosenbergii (De Man, 1879 held in different population densities were analysed. Postlarvae prawns were stocked into five 0,02 ha earthen ponds at densities of 4, 8, 12, 16 and 20 ind./m² during six months. Forthnightly, the mean total length of animals from each pond were obtained by means of random samples. For each population the length growth curves and the instantaneous growth rate expressions were determined. The growth rate and the asymptotic maximum length decreased with the stocking density raised. This effect is greater when the density ranges in low levels. The growth decrease can be due to intraspecific competition for life resources and to negative interactions between individuals, as aggressive or social behavior, that increase with the increase prawns density.

  13. Biologia reprodutiva de Macrobrachium olfersii (Wiegman (Crustacea, Decapoda, Palaemonidae coletados na Ilha de Santa Catarina, Brasil Reproductive biology of Macrobrachium olfersii (Wiegman (Crustacea, Decapoda, Palaemonidae collected at Santa Catarina's Island, Brazil

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    Dib Ammar

    2001-06-01

    Full Text Available The aim of this study is to characterize the reproductive features of Macrobrachium olfersii (Wiegman, 1836 from Santa Catarina's lsland. The animals were collected in freshwater streams of the Ratones Hidrografic Basin (site A1 and at the Peri's Pond (site A2. In the laboratory, the procedures of sexual differentiation were carried out to classify the individuais in males, females or ovigerous females, followed by the determination of total weight (g, quelipod relative weight (g and total length (mm. The eggs were removed from the ovigerous females and counted. Sexual maturity and fecundity were analyzed based in the dimensions and number of eggs carried by ovigerous females. The water temperature on the capture sites varied from 17 to 29ºC throughout the months of study. A total of 503 individuais were captured, with 129 individuais from site A1 and 374 from site A2. The mean total size and length was 49.65 mm and 3.79 g for the males, 38.75 mm and 1.61 g for the females and 36.19 mm and 1.08 g for the ovigerous females. At the sites A1 and A2, the individual sexual maturity was reached with 27.3 and 21.2 mm of total length, respectively, while populational sexual maturity was estimated for the 45.0 to 50.0 mm class at site A1 and for the 30.0 to 35.0 mm class at site A2. The ovigerous females carried an average of 3464 eggs at site A1, and 1440 eggs at site A2. These reproductive features, presented by M. olfersii, show the species' plasticity, which can be associated with environmental variations, contributing to its reproductive success.

  14. Crescimento relativo do camarão canela Macrobrachium amazonicum (Heller (Crustacea, Decapoda, Palaemonidae em viveiros Relative growth of Amazon river prawn Macrobrachium amazonicum (Heller (Crustacea, Decapoda, Palaemonidae in earthen ponds

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    Patrícia M.C. Moraes-Riodades

    2002-12-01

    Full Text Available Some morphometric relationships in Macrobrachium amazonicum (Heller, 1862 reared in earthen ponds were studied. A total of 239 individuals were collected, sexed and sorted to juvenile or adult. Total length (Lt, post-orbital length (Lpo, carapace length (Lcp and queliped length (Lql were measured. The relationships Lt/Lpo, Lpo/Lcp and Lt/Lcp are the same for juveniles, males and females, indicating unchanged growth pattern during post-larval ontogenetic development. While Lt/Lpo showed isometric growth, Lpo/Lcp and Lt/Lcp showed negative allometry. On the other hand, for the Lql/Lcp relationship, juveniles showed isometric growth, females slight positive allometry and males a strong positive allometry. It suggests that the importance of chelipeds may be different in these groups. Quelipeds play important role on food capture and on agonistic, social and reproductive behavior. Therefore, inter and intraspecific interactions may change during prawn growth, even after morphological

  15. Alometria no crescimento de Uca mordax (Smith (Crustacea, Decapoda, Ocypodidae na Baía de Guaratuba, Paraná, Brasil Allometric growth in the fiddler crab Uca mordax (Smith (Crustacea, Decapoda, Ocypodidae from Guaratuba Bay, Parana, Brazil

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    Setuko Masunari

    2005-12-01

    Full Text Available Um estudo do crescimento relativo da maior quela do macho e do abdome da fêmea foi realizado numa população do caranguejo chama-maré Uca mordax (Smith, 1870 ocorrente no extremo oeste da Baía de Guaratuba, Paraná, sul do Brasil. O comprimento da maior quela (CMQ foi medido em 319 machos, e a largura do abdome (LAB em 356 fêmeas. Adicionalmente, seis chama-marés sexualmente indiferenciados foram analisados. A largura da carapaça (LC foi escolhida como dimensão de referência para ambos os sexos, a qual variou de 1,94 a 20,0 mm para machos, de 2,50 a 18,85 mm para fêmeas, e de 1,94 a 3,15 para os indivíduos sexualmente indiferenciados. A relação entre o LC e CMQ mostrou um ponto de inflexão em 11,70 mm LC nos machos, e entre LC e LAB, em 8,77 mm LC dentre as fêmeas. Os machos (média LC = 14,24 mm atingiram tamanhos pouco maiores do que as fêmeas (média LC = 13,97 mm. O crescimento foi alométrico positivo durante toda a ontogênese de ambos os sexos, isto é, antes e depois da muda puberal. As equações das relações entre LC e CMQ nos machos foram: logCMQ = -0,542265 + 1,51.logLC para machos juvenis e logCMQ = -1,446281 + 2,37.logLC para machos adultos. Nas fêmeas, a relação entre LC e LAB foi: logLAB = -0,607282 + 1,22.logLC e logLAB = -0,912074 + 1,60.logLC, respectivamente, para juvenis e adultas. Estas dimensões estão relacionadas com as atividades reprodutivas da espécie. O nível de alometria do CMQ dos machos adultos de U. mordax foi o mais alto dentre as espécies do gênero, cujo crescimento relativo desta dimensão foi estudado. A proporção de machos destros foi estatisticamente a mesma daqueles sinistros (1:1.Relative growth of the male major chela and female abdomen was studied in a population of the fiddler crab Uca mordax (Smith, 1870 from Guaratuba Bay, Parana, Southern Brazil. Major chela length (CMQ was measured from 319 males, and abdomen width (LAB from 356 females. Also six small sexually undifferentiated crabs were measured. Carapace width (LC was the reference dimension for both sexes, which ranged from 1.94 to 20.0 mm for males, from 2.50 to 18.85 mm for females, and from 1.94 to 3.15 mm for sexually undifferentiated crabs. Relationship between LC and CMQ showed a transition point at 11.70 mm LC in males, and between LC and LAB, at 8.77 mm LC in females. Males (mean LC = 14.24 mm showed a slightly greater size than females (mean LC = 13,97 mm. These dimensions had positive allometrical growth during all life for both sexes: before and after the puberal molting. Regressions between LC and CMQ in males read as: logCMQ = -0,542265 + 1,51.logLC for male juveniles and logCMQ = -1,446281 + 2,37.logLC for male adults. In females, the regressions between LC and LAB were: logLAB = -0,607282 + 1,22.logLC for juveniles and logLAB = -0,912074 + 1,60.logLC for adults. These body dimensions are related to reproductive activities of this species. The level of allometry in CMQ of adult males was the highest among Uca species which relative growth of this dimension is known. The handedness had a proportion of 1:1 between right-handed and left-handed males.

  16. Shallow water hippolytid shrimps (Crustacea: Decapoda: Caridea) from the Mexican Caribbean coast Camarones hipolítidos (Crustacea: Decapoda: Caridea) de aguas someras de la costa del Caribe mexicano

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    Ramiro Román-Contreras; Mario Martínez-Mayén

    2009-01-01

    A checklist of shallow water shrimps of the family Hippolytidae of the central-southern coast of the Mexican Caribbean is presented. A total of 11 species belonging to 6 genera were collected on beds of Thalassia testudinum in Bahía de la Ascensión, Bahía del Espíritu Santo, and the Mahahual reef lagoon, Quintana Roo, Mexico. Genera Hippolyte and Thor were the most diverse with three species each. An updated geographic distribution along the western Atlantic and other regions is provided for ...

  17. Biodiversity of non-marine ostracods (Crustacea, Ostracoda in the alluvial valley of the upper Paraná River, Brazil Biodiversidade de ostrácodes (Crustacea, Ostracoda no vale aluvial do Alto Rio Paraná, Brasil

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    J. Higuti

    2009-06-01

    Full Text Available In the present study, we test the relevance of a number of environmental factors on alpha and beta ostracod diversities, at species and family level. Ostracods were sampled from several substrates, including sediment and root systems of various floating aquatic macrophytes, from 48 environments (both lentic and lotic habitats, ranging from the river itself, over connecting channels linking with open lakes, and, finally closed lakes, belonging to four different systems (Paraná, Ivinheima, Baía and Taquaruçu, in the alluvial valley of the Upper Paraná River. The faunistic survey recorded the presence of 54 species of Ostracoda, belonging to the families Cyprididae, Candonidae, Limnocytheridae and Darwinulidae. Various diversity estimators indicated that these recorded levels of specific diversity should be close to true values. Higher values of ostracods species richness (alpha diversity were observed in the Baía and Ivinheima systems, while lotic habitats were richer than lentic ones. In addition, open lakes appeared to be more affected by the variable 'system' than closed ones, which can to some extend be explained by the putative effects of flood pulse on benthic communities. The two investigated factors have different effects on the four ostracod families. The present study also indicated that there is a large homogeneity within and between systems, as exemplified by the low beta-diversity levels.No presente estudo foi testada a relevância de fatores ambientais sobre a diversidade alfa e beta de ostrácodes, bem como, sobre a diversidade de um nível taxonômico mais elevado (família. Os ostrácodes foram coletados em vários substratos, incluindo o sedimento e macrófitas aquáticas flutuantes, de 48 ambientes (habitats lênticos e lóticos, variando desde o próprio rio, conectado a canais, que estão ligados à lagoas abertas e, finalmente, lagoas fechadas, pertencentes a diferentes sistemas (Paraná, Ivinheima, Baía e Taquaruçu, no vale aluvial do Alto Rio Paraná. O levantamento faunístico registrou a ocorrência de 54 espécies de Ostracoda, pertencentes às famílias Cyprididae, Candonidae, Limnocytheridae e Darwinulidae. Vários estimadores de diversidade indicaram que estes níveis de diversidade foram próximos aos valores esperados. Maiores valores de riqueza de espécies de ostrácodes (diversidade alfa foram observados nos sistemas Baía e Ivinheima, ao passo que os ambientes lóticos foram mais ricos que os lênticos. Além disso, lagoas abertas parecem ser mais afetados pela variável sistema do que as lagoas fechadas, as quais podem ser de alguma maneira explicado por um possível efeito do pulso de inundação sobre as comunidades bênticas. Os dois fatores investigados apresentaram efeitos distintos sobre as quatro famílias de ostrácodes. O presente estudo também indicou que existe uma grande homogeneidade dentro e entre os sistemas como evidenciada pelos baixos níveis de diversidade beta.

  18. Experimental infection in Notodiaptomus sp. (Crustacea: Calanoida with larvae of Camallanus sp. (Nematoda: Camallanidae Infecção experimental em Notodiaptomus sp. (Crustacea: Calanoida com larvas de Camallanus sp. (Nematoda: Camallanidae

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    M.L. Martins

    2007-04-01

    Full Text Available This trial registered the experimental infection viability with nematode larvae Camallanus sp. in Notodiaptomus sp., a crustacean, which can be an intermediate host. Adult females of nematode were dissected from the intestines of Xiphophorus maculatus (Osteichthyes: Poeciliidae, at a fish farm in the State of São Paulo. Females were slightly compressed for larvae release, collected with Pasteur pipette and separated on Petri dishes with 9ml filtered water at 28.1ºC, from zooplankton culture. Treatments consisted of Petri dishes with 60 and 105 copepods, in which 120, 150 and 210 larvae of nematode were added in four replications. Twenty-four and 36h after exposition to the larvae, the copepods were fixed in 70% alcohol to record the amount of fixed larvae. Twenty four hours after exposition, 60 copepods group with 120 larvae showed significantly higher prevalence (46.5% when compared to 105 copepods and 120 larvae (33.2%. Thus, these answers suggested that 120 larvae were enough for a successful infectivity. Experimental infection was available and so, it was used as a pattern to life cycle studies of camallanid nematodes and hosts susceptibility tests.A viabilidade da infecção experimental com larvas do nematóide Camallanus sp. em Notodiaptomus sp., crustáceo com potencial para hospedeiro intermediário foi avaliada. Fêmeas adultas do nematóide foram extraídas de Xiphophorus maculatus (Osteichthyes: Poeciliidae, provenientes de piscicultura de peixes ornamentais no estado de São Paulo. As fêmeas foram ligeiramente pressionadas para liberar as larvas, coletadas com pipeta Pasteur e separadas em placas de Petri contendo 9ml de água filtrada a 28,1ºC do próprio cultivo de zooplâncton. Os tratamentos consistiram de placas contendo 60 e 105 copépodes onde se adicionou 120, 150 e 210 larvas de nematóides em quatro repetições. Nos tempos de 24 e 36h após a exposição às larvas, os copépodes foram fixados em álcool 70% para quantificação de larvas. Após 24h de exposição, o grupo com 60 copépodes na presença de 120 larvas apresentou maior prevalência (46,5% do que 105 copépodes com 120 larvas (33,2%. Sugere-se que 120 larvas foram suficientes para o sucesso da infecção. A infecção experimental mostrou-se viável, servindo de modelo para o estudo do ciclo de vida de camalanídeos e testes de susceptibilidade de hospedeiros.

  19. Registros nuevos de parásitos epicarideos (Crustacea: Isopoda en México y suroeste del golfo de México New records of epicaridean parasites (Crustacea: Isopoda from Mexico, and southwestern Gulf of Mexico

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    Ramiro Román-Contreras

    2011-12-01

    Full Text Available Anathelges hyptius (Thompson, 1902, Parabopyrella mortenseni (Nierstrasz y Brender á Brandis, 1929 y Metaphrixus carolii Nierstrasz y Brender á Brandis, 1931, son nuevos registros para México. Bopyrione synalphei Bourdon et Markham, 1980, Bopyrinella thorii (Richardson, 1904, Probopyrus pandalicola (Packard, 1879, y Probopyrus bithynis Richardson, 1904 se registraron por primera vez en la laguna de Términos, Campeche. Con la adición de estos registros y otras especies aún no descritas, se estima que el número de epicarideos para el Atlántico mexicano es ahora aproximadamente de 23 especies y de 42 para el país. Alpheus viridari (Armstrong, 1949 y Synalpheus apioceros Coutière, 1909 son nuevos hospederos para P. mortenseni y B. synalphei, respectivamente.Anathelges hyptius (Thompson, 1902, Parabopyrella mortenseni (Nierstrasz et Brender á Brandis, 1929 and Metaphrixus carolii Nierstrasz et Brender á Brandis, 1931, are new records for Mexico. Bopyrione synalphei Bourdon and Markham, 1980, Bopyrinella thorii (Richardson, 1904, Probopyrus pandalicola (Packard, 1879, and Probopyrus bithynis Richardson, 1904, are reported for the first time in Laguna de Terminos, Campeche. With the addition of new registered to a former list the number up approximately to 23 species in the Mexican Atlantic, and 42 species for Mexico. Alpheus viridari (Armstrong, 1949 and Synalpheus apioceros Coutière, 1909 are recorded as new hosts for Parabopyrella mortenseni and Bopyrione synalphei, respectively.

  20. Studies on the reproductive dynamics of Pleoticus muelleri (Bate, 1888 (Crustacea, Decapoda, Solenoceridae of Patagonia, Argentina Estudios sobre la dinámica reproductiva del langostino Pleoticus muelleri (Bate, 1888 (Crustacea, Decapoda, Solenoceridae de Patagonia, Argentina

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    Mónica Fernández

    2012-11-01

    Full Text Available Certain aspects of the reproductive dynamics of Argentine red shrimp Pleoticus muelleri (Bate, 1888, distributed between 42°-47°S and 62°W, were investigated. Data and samples were collected during 36 INIDEP research cruises and 87 commercial fishing fleet trips between 1994-2010. Mature and inseminated females size structure as well as the frequency distribution of macroscopic maturity stages of adult females were analyzed on space-time bases. The seasonal development of ovarian maturity stages microscopically determinated was also assessed. Statistical treatment of data included multivariate scaling and cluster analysis. The reproductive activity of the shrimps showed latitudinal differences concerning its onset and duration that could be associated with the variability of environmental conditions. We discuss a shoreward movement of spawning females related to the presence of coastal hydrographic processes that would ensure retention and food for survival of early life stages.Se estudian ciertos aspectos de la dinámica reproductiva del langostino Pleoticus muelleri (Bate, 1988 en el área comprendida entre 42°-47°S y 62°W. Los datos y las muestras analizadas provienen de 36 campanas de investigación del INIDEP y de 87 viajes de la flota comercial langostinera realizados entre 1994 y 2010. Se analiza la estructura de tallas de las hembras maduras e impregnadas, al igual que la distribución de frecuencias de los distintos estadios de madurez sexual de las hembras adultas diferenciados macros-cópicamente, desde un enfoque espacio-temporal. La evolución estacional de los estadios de desarrollo ovárico determinados histológicamente también fue contemplada. El tratamiento estadístico de los datos comprendió un escalamiento multivariado y un análisis de agrupamiento jerárquico. La actividad reproductiva del langostino presenta diferenciaciones latitudinales con respecto a su inicio y duración que podría relacionarse con la variabilidad de las condiciones ambientales. Se discute la relación entre el movimiento hacia la costa de las hembras impregnadas y la presencia de procesos hidrográficos costeros que asegurarían la retención y disponibilidad de alimento para la supervivencia de las primeras etapas de vida.