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Auteur Rolland, J.-L.; Medhioub, W.; Vergnes, A.; Abi-khalil, C.; Savar, V.; Abadie, E.; Masseret, E.; Amzil, Z.; Laabir, M.
Titre A Feedback Mechanism to Control Apoptosis Occurs in the Digestive Gland of the Oyster Crassostrea gigas Exposed to the Paralytic Shellfish Toxins Producer Alexandrium catenella Type Article scientifique
Année 2014 Publication Revue Abrégée Marine Drugs
Volume 12 Numéro 9 Pages (down) 5035-5054
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ISSN 1660-3397 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 396
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Auteur Lorin-Nebel, C.; Budzinski, H.; Le Ménach, K.; Devier, M.H.; Charmantier, G.; Gros, R.; Grousset, E.; Blondeau-Bidet, E.; Farcy, E.
Titre 4-Nonylphenol disrupts osmoregulation in the European sea-bass Dicentrarchus labrax Type Article scientifique
Année 2014 Publication Revue Abrégée Journal of Xenobiotics
Volume 4 Numéro Pages (down) 4905-4907
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 418
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Auteur Zhao, T.; Villeger, S.; Lek, S.; Cucherousset, J.
Titre High intraspecific variability in the functional niche of a predator is associated with ontogenetic shift and individual specialization Type Article scientifique
Année 2014 Publication Revue Abrégée Ecology and Evolution
Volume 4 Numéro 24 Pages (down) 4649-4657
Mots-Clés functional traits; niche; ontogeny; overlap; stable isotope analyses
Résumé Investigations on the functional niche of organisms have primarily focused on differences among species and tended to neglect the potential effects of intraspecific variability despite the fact that its potential ecological and evolutionary importance is now widely recognized. In this study, we measured the distribution of functional traits in an entire population of largemouth bass (Micropterus salmoides) to quantify the magnitude of intraspecific variability in functional traits and niche (size, position, and overlap) between age classes. Stable isotope analyses (δ13C and δ15N) were also used to determine the association between individual trophic ecology and intraspecific functional trait variability. We observed that functional traits were highly variable within the population (mean coefficient variation: 15.62% ± 1.78% SE) and predominantly different between age classes. In addition, functional and trophic niche overlap between age classes was extremely low. Differences in functional niche between age classes were associated with strong changes in trophic niche occurring during ontogeny while, within age classes, differences among individuals were likely driven by trophic specialization. Each age class filled only a small portion of the total functional niche of the population and age classes occupied distinct portions in the functional space, indicating the existence of ontogenetic specialists with different functional roles within the population. The high amplitude of intraspecific variability in functional traits and differences in functional niche position among individuals reported here supports the recent claims for an individual-based approach in functional ecology.
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ISSN 2045-7758 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 1183
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Auteur Wang, T.; Lefevre, S.; Iversen, N.K.; Findorf, I.; Buchanan, R.; McKenzie, D.J.
Titre Anaemia only causes a small reduction in the upper critical temperature of sea bass: is oxygen delivery the limiting factor for tolerance of acute warming in fishes? Type Article scientifique
Année 2014 Publication Revue Abrégée Journal of Experimental Biology
Volume 217 Numéro 24 Pages (down) 4275-4278
Mots-Clés aerobic scope; cardiac-performance; Cardiovascular; climate-change; dicentrarchus-labrax; ecology; exp. biol. 216; fish; Haematocrit; metabolism; Oxygen transport; phenylhydrazine-induced anemia; thermal tolerance; trout
Résumé To address how the capacity for oxygen transport influences tolerance of acute warming in fishes, we investigated whether a reduction in haematocrit, by means of intra-peritoneal injection of the haemolytic agent phenylhydrazine, lowered the upper critical temperature of sea bass. A reduction in haematocrit from 42 +/- 2% to 20 +/- 3% (mean +/- s.e.m.) caused a significant but minor reduction in upper critical temperature, from 35.8 +/- 0.1 to 35.1 +/- 0.2 degrees C, with no correlation between individual values for haematocrit and upper thermal limit. Anaemia did not influence the rise in oxygen uptake between 25 and 33 degrees C, because the anaemic fish were able to compensate for reduced blood oxygen carrying capacity with a significant increase in cardiac output. Therefore, in sea bass the upper critical temperature, at which they lost equilibrium, was not determined by an inability of the cardio-respiratory system to meet the thermal acceleration of metabolic demands.
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ISSN 0022-0949 ISBN Médium
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Notes <p>ISI Document Delivery No.: AW7BT<br/>Times Cited: 1<br/>Cited Reference Count: 44<br/>Wang, Tobias Lefevre, Sjannie Iversen, Nina K. Findorf, Inge Buchanan, Rasmus McKenzie, David J.<br/>Centre National de la Recherche Scientifique (CNRS); Danish Research Council; Region Languedoc-Roussillon (RLR); Ambassade de France in Copenhagen; Universite Montpellier 2<br/>This research was supported by the Centre National de la Recherche Scientifique (CNRS), the Danish Research Council, The Ambassade de France in Copenhagen and Universite Montpellier 2. T.W. was supported by a fellowship from Region Languedoc-Roussillon (RLR) as a visiting professor at Universite Montpellier 2. I.F. and N.K.I. were supported by a student grant from The Ambassade de France in Copenhagen.<br/>Company of biologists ltd<br/>Cambridge</p> Approuvé pas de
Numéro d'Appel MARBEC @ alain.herve @ collection 1181
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Auteur Fablet, R.; Chaigneau, A.; Bertrand, S.
Titre Multiscale analysis of geometric planar deformations : application to wild animal electronic tracking and satellite ocean observation data Type Article scientifique
Année 2014 Publication Revue Abrégée Ieee Transactions on Geoscience and Remote Sensing
Volume 52 Numéro 6 Pages (down) 3627-3636
Mots-Clés Animal movements; geophysical fields; multiscale geometry; planar curve; trajectory analysis; wavelet analysis
Résumé The development of animal tracking technologies (including GPS and ARGOS satellite systems) and the increasing resolution of remote-sensing observations call for tools extracting and describing the geometric patterns along a track or within an image over a wide range of spatial scales. Whereas shape analysis has largely been addressed over the last decades, the multiscale analysis of the geometry of opened planar curves has received little attention. We here show that classical multiscale techniques cannot properly address this issue and propose an original wavelet-based scheme. To highlight the generic nature of our multiscale wavelet technique, we report applications to two different observation data sets, namely, wild animal movement paths recorded by electronic tags and satellite observations of sea-surface geophysical fields.
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ISSN 0196-2892 ISBN Médium
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Numéro d'Appel LL @ pixluser @ collection 328
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