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Auteur Sucre, E.; Charmantier-Daures, M.; Grousset, E.; Charmantier, G.; Cucchi-Mouillot, P. url  doi
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  Titre Early development of the digestive tract (pharynx and gut) in the embryos and pre-larvae of the European sea bass Dicentrarchus labrax Type Article scientifique
  Année 2009 Publication (up) Revue Abrégée J. Fish Biol.  
  Volume 75 Numéro 6 Pages 1302-1322  
  Mots-Clés Moronidae; arch; atlantic salmon; chloride cells; development; embryo; gill arches; gill slits; histology; medaka oryzias-latipes; ontogeny; oreochromis-niloticus; paralichthys-olivaceus embryos; rainbow-trout; respiratory development; urinary system; zebrafish  
  Résumé The European sea bass Dicentrarchus labrax is a marine teleost important in Mediterranean aquaculture. The development of the entire digestive tract of D. labrax, including the pharynx, was investigated from early embryonic development to day 5 post hatching (dph), when the mouth opens. The digestive tract is initialized at stage 12 somites independently from two distinct infoldings of the endodermal sheet. In the pharyngeal region, the anterior infolding forms the pharynx and the first gill slits at stage 25 somites. The other three gill arches and slits are formed between 1 and 5 dph. Posteriorly, in the gut tube region, a posterior infolding forms the foregut, midgut and hindgut. The anus opens before hatching, at stage 28 somites. Associated organs (liver, pancreas and gall bladder) are all discernable from 3 dph. Some aspects of the development of the two independent initial infoldings seem original compared with data in the literature. These results are discussed and compared with embryonic and post-embryonic development patterns in other teleosts.  
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  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 0022-1112 ISBN Médium  
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  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 543  
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Auteur Paiola, M.; Knigge, T.; Duflot, A.; Pinto, P.I.S.; Farcy, E.; Monsinjon, T. doi  openurl
  Titre Oestrogen, an evolutionary conserved regulator of T cell differentiation and immune tolerance in jawed vertebrates? Type Article scientifique
  Année 2018 Publication (up) Revue Abrégée Dev. Comp. Immunol.  
  Volume 84 Numéro Pages 48-61  
  Mots-Clés bass dicentrarchus-labrax; danio-rerio; dendritic cells; estradiol; european sea-bass; Gamma-delta T cell; gene-expression; Head-kidney; receptor modulators; Regulatory T cell; reproductive-cycle; Spleen; Teleost; thymic epithelial-cells; Thymus; zebrafish  
  Résumé In teleosts, as in mammals, the immune system is tightly regulated by sexual steroid hormones, such as oestrogens. We investigated the effects of 17 beta-oestradiol on the expression of several genes related to T cell development and resulting T cell subpopulations in sea bass, Dicentrarchus labrax, for a primary lymphoid organ, the thymus, and two secondary lymphoid organs, the head-kidney and the spleen. In parallel, the oxidative burst capacity was assessed in leucocytes of the secondary lymphoid organs. Apoptosis- and proliferation-related genes, indicative of B and T cell clonal selection and lymphoid progenitor activity, were not affected by elevated oestrogen-levels. Sex-related oestrogen-responsiveness in T cell and antigen-presenting cell markers was observed, the expression of which was differentially induced by oestrogen-exposure in the three lymphoid organs. Remarkably, in the spleen, oestrogen increased regulatory T cell-related gene expression was associated with a decrease in oxidative burst capacity. To the best of our knowledge, this study indicates for the first time that physiological levels of oestrogen are likely to promote immune tolerance by modulating thymic function (i.e., T cell development and output) and peripheral T cells in teleosts, similar to previously reported oestrogenic effects in mammals. (C) 2018 Elsevier Ltd. All rights reserved.  
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  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 0145-305x ISBN Médium  
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  Numéro d'Appel MARBEC @ alain.herve @ collection 2340  
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Auteur McKenzie, D.J.; Belao, T.C.; Killen, S.S.; Rantin, F.T. doi  openurl
  Titre To boldly gulp: standard metabolic rate and boldness have context-dependent influences on risk-taking to breathe air in a catfish Type Article scientifique
  Année 2015 Publication (up) Revue Abrégée J. Exp. Biol.  
  Volume 218 Numéro 23 Pages 3762-3770  
  Mots-Clés african catfish; animal personality; Bimodal respiration; clarias-gariepinus; ecological consequences; Energy metabolism; european sea bass; Hypoxia; individual variation; oncorhynchus-mykiss; Personality; personality-traits; predation risk; Respiratory partitioning; Risk-taking; wild-type zebrafish  
  Résumé The African sharptooth catfish Clarias gariepinus has bimodal respiration, it has a suprabranchial air-breathing organ alongside substantial gills. We used automated bimodal respirometry to reveal that undisturbed juvenile catfish (N=29) breathed air continuously in normoxia, with a marked diurnal cycle. Air breathing and routine metabolic rate (RMR) increased in darkness when, in the wild, this nocturnal predator forages. Aquatic hypoxia (20% air saturation) greatly increased overall reliance on air breathing. We investigated whether two measures of risk taking to breathe air, namely absolute rates of aerial O-2 uptake ((M) over dotO(2), air) and the percentage of RMR obtained from air (% (M) over dotO(2), air), were influenced by individual standard metabolic rate (SMR) and boldness. In particular, whether any influence varied with resource availability (normoxia versus hypoxia) or relative fear of predation (day versus night). Individual SMR, derived from respirometry, had an overall positive influence on (M) over dotO(2), air across all contexts but a positive influence on % (M) over dotO(2), air only in hypoxia. Thus, a pervasive effect of SMR on air breathing became most acute in hypoxia, when individuals with higher O-2 demand took proportionally more risks. Boldness was estimated as time required to resume air breathing after a fearful stimulus in daylight normoxia (T-res). Although T-res had no overall influence on (M) over dotO(2), air or % (M) over dotO(2), air, there was a negative relationship between Tres and % (M) over dotO(2), air in daylight, in normoxia and hypoxia. There were two Tres response groups, 'bold' phenotypes with Tres below 75 min (N= 13) which, in daylight, breathed proportionally more air than 'shy' phenotypes with Tres above 115 min (N= 16). Therefore, individual boldness influenced air breathing when fear of predation was high. Thus, individual energy demand and personality did not have parallel influences on the emergent tendency to take risks to obtain a resource; their influences varied in strength with context.  
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  Volume de collection Numéro de collection Edition  
  ISSN 0022-0949 ISBN Médium  
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  Numéro d'Appel MARBEC @ alain.herve @ collection 1429  
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Auteur Legradi, J.B.; Di Paolo, C.; Kraak, M.H.S.; van der Geest, H.G.; Schymanski, E.L.; Williams, A.J.; Dingemans, M.M.L.; Massei, R.; Brack, W.; Cousin, X.; Begout, M.-L.; van der Oost, R.; Carion, A.; Suarez-Ulloa, V.; Silvestre, F.; Escher, B.I.; Engwall, M.; Nilen, G.; Keiter, S.H.; Pollet, D.; Waldmann, P.; Kienle, C.; Werner, I.; Haigis, A.-C.; Knapen, D.; Vergauwen, L.; Spehr, M.; Schulz, W.; Busch, W.; Leuthold, D.; Scholz, S.; vom Berg, C.M.; Basu, N.; Murphy, C.A.; Lampert, A.; Kuckelkorn, J.; Grummt, T.; Hollert, H. doi  openurl
  Titre An ecotoxicological view on neurotoxicity assessment Type Article scientifique
  Année 2018 Publication (up) Revue Abrégée Environ. Sci Eur.  
  Volume 30 Numéro Pages 46  
  Mots-Clés Behaviour; zebrafish danio-rerio; environmental risk-assessment; acetylcholinesterase inhibitors; adverse outcome pathways; aop; Computational toxicity; developmental neurotoxicity; diesel exhaust; Eco-neurotoxicity; Ecological; eda; effect-directed analysis; lateral-line; Neurotoxicity; performance liquid-chromatography; reach; Species; swimming behavior  
  Résumé The numbers of potential neurotoxicants in the environment are raising and pose a great risk for humans and the environment. Currently neurotoxicity assessment is mostly performed to predict and prevent harm to human populations. Despite all the efforts invested in the last years in developing novel in vitro or in silico test systems, in vivo tests with rodents are still the only accepted test for neurotoxicity risk assessment in Europe. Despite an increasing number of reports of species showing altered behaviour, neurotoxicity assessment for species in the environment is not required and therefore mostly not performed. Considering the increasing numbers of environmental contaminants with potential neurotoxic potential, eco-neurotoxicity should be also considered in risk assessment. In order to do so novel test systems are needed that can cope with species differences within ecosystems. In the field, online-biomonitoring systems using behavioural information could be used to detect neurotoxic effects and effect-directed analyses could be applied to identify the neurotoxicants causing the effect. Additionally, toxic pressure calculations in combination with mixture modelling could use environmental chemical monitoring data to predict adverse effects and prioritize pollutants for laboratory testing. Cheminformatics based on computational toxicological data from in vitro and in vivo studies could help to identify potential neurotoxicants. An array of in vitro assays covering different modes of action could be applied to screen compounds for neurotoxicity. The selection of in vitro assays could be guided by AOPs relevant for eco-neurotoxicity. In order to be able to perform risk assessment for eco-neurotoxicity, methods need to focus on the most sensitive species in an ecosystem. A test battery using species from different trophic levels might be the best approach. To implement eco-neurotoxicity assessment into European risk assessment, cheminformatics and in vitro screening tests could be used as first approach to identify eco-neurotoxic pollutants. In a second step, a small species test battery could be applied to assess the risks of ecosystems.  
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  Volume de collection Numéro de collection Edition  
  ISSN 2190-4715 ISBN Médium  
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  Numéro d'Appel MARBEC @ alain.herve @ collection 2485  
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Auteur Cousin, X.; Batel, A.; Bringer, A.; Hess, S.; Begout, M.-L.; Braunbeck, T. doi  openurl
  Titre Microplastics and sorbed contaminants – Trophic exposure in fish sensitive early life stages Type Article scientifique
  Année 2020 Publication (up) Revue Abrégée Mar. Environ. Res.  
  Volume 161 Numéro Pages 105126  
  Mots-Clés Artemia; benzo[a]pyrene; chemicals; cyp1a induction; Fish; fresh-water ecosystems; ingestion; Larvae; Marine medaka; Microplastics; mytilus-edulis l.; north-sea; Paramecium; pcbs; persistent organic pollutants; resin pellets; Trophic transfer; zebrafish; Zebrafish  
  Résumé The present study evaluated very small microplastic particle (MPs) transfer to zebrafish and marine medaka larvae via prey experimentally exposed to MPs from the onset of feeding. Larvae were fed Paramecium or Anemia nauplii loaded with fluorescent 1-5 or 10-20 mu m MP. Pollutant accumulation was analyzed by optically tracking of benzo[a]pyrene (BaP) and recording cyp1a transcription. Paramecium transferred 1-5 mu m particles only, whereas Artemia efficiently transferred both MPs. Although zebrafish and medaka larvae fed from the onset of active food intake (2-3 dph, respectively) on Paramecium and from days 6-7 post-hatch on Artemia nauplii, neither MP accumulation nor translocation to tissues was detected. MP egestion started within few hours after ingestion. Cyp1a induction and fluorescent analyses proved BaP bioavailability after transfer via Paramecium and Artemia. Unicellular or plankton organisms ingest contaminants via MPS and transfer effectively these to sensitive early life-stages of vertebrates, giving rise to whole-life exposure.  
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  Langue English Langue du Résumé Titre Original  
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  Volume de collection Numéro de collection Edition  
  ISSN 0141-1136 ISBN Médium  
  Région Expédition Conférence  
  Notes WOS:000579495700050 Approuvé pas de  
  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2893  
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