Consulta: creatorFacets:"Leguay, Didier"
Registros recuperados: 18
Data/hora: 06/06/2024 16:57:41

Chronic dietary exposure to pyrolytic and petrogenic mixtures of PAHs causes physiological disruption in zebrafish—part II: behavior
Provedor de dados: 5
Autores: Vignet, Caroline; Le Menach, Karyn; Lyphout, Laura; Guionnet, Tiphaine; Frere, Laura; Leguay, Didier; Budzinski, Helene; Cousin, Xavier; Begout, Marie-laure.
In the last 10 years, behavior assessment has been developed as an indicator of neurotoxicity and an integrated indicator of physiological disruption. Polycyclic aromatic hydrocarbon (PAH) release into the environment has increased in recent decades resulting in high concentrations of these compounds in the sediment of contaminated areas. We evaluated the behavioral consequences of long-term chronic exposure to PAHs, by exposing zebrafish to diets spiked with three PAH fractions at environmentally relevant concentrations. Fish were exposed to these chemicals from their first meal (5 days postfertilization) until they became reproducing adults (at 6 months old). The fractions used were representative of PAHs of pyrolytic (PY) origin and of two oils...
Tipo: Text
Palavras-chave: Danio rerio; Polycyclic aromatic hydrocarbon; Heavy oil; Light crude oil; Anxiety-like behavior; Photomotor responses; Maze; Novel tank.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00188/29910/28380.pdf

Long-term dietary-exposure to non-coplanar PCBs induces behavioral disruptions in adult zebrafish and their offspring
Provedor de dados: 5
Autores: Pean, Samuel; Daouk, Tarek; Vignet, Caroline; Lyphout, Laura; Leguay, Didier; Loizeau, Veronique; Begout, Marie-laure; Cousin, Xavier.
The use of polychlorinated biphenyls (PCBs) has been banned for several decades. PCBs have a long biological half-life and high liposolubility which leads to their bioaccumulation and biomagnification through food chains over a wide range of trophic levels. Exposure can lead to changes in animal physiology and behavior and has been demonstrated in both experimental and field analyses. There are also potential risks to high trophic level predators, including humans. A maternal transfer has been demonstrated in fish as PCBs bind to lipids in eggs. In this study, behavioral traits (exploration and free swimming, with or without challenges) of contaminated zebrafish (Danio rerio) adults and their offspring (both as five-day-old larvae and as two-month-old fish...
Tipo: Text
Palavras-chave: Exploration; Swimming activity; Organic pollutant effects; Generation; Video analysis.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00167/27799/26068.pdf

Modélisation de la contamination des bivalves par les toxines d'Alexandrium spp. Rapport final
Provedor de dados: 5
Autores: Lassus, Patrick; Amzil, Zouher; Bardouil, Michele; Baron, Regis; Bohec, Madeleine; Bougrier, Serge; Garen, Pierre; Laabir, Mohamed; Leguay, Didier; Masselin, Pierre; Truquet, Philippe; Sechet, Veronique; Bablon, Clotilde; Berard, Jean-baptiste; Carre, Camille; Cheignon, Valerie; Lecamp, Sylvain; Mabit, Marie.
L'objectif général de l'étude est de simuler les épisodes de contamination de certains bivalves (huîtres et moules) par les toxines d'Alexandrium minutum et A. calenella à partir d'un module expérimental adapté, et en vue de construire un modèle de contamination applicable à ces espèces. Ce modèle sera ensuite susceptible d'être couplé aux modèles biologiques locaux (estuaire de Penzé et étang de Thau) de déterminisme des blooms, ainsi qu'aux modèles hydrodynamiques développés par différentes équipes (Ifremer, Université de Montpellier). La première année (2001-2002) était consacrée à la simulation des contaminations en estuaire de Penzé (Alexandrium minulum) et au développement de cultures en masse d'A. calenella de Thau en bioréacteurs.
Tipo: Text
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00156/26711/24786.pdf

Modelling growth and reproduction of the Pacific oyster Crassostrea gigas: Advances in the oyster-DEB model through application to a coastal pond
Provedor de dados: 5
Autores: Bourles, Yves; Alunno-bruscia, Marianne; Pouvreau, Stephane; Tollu, Guillaume; Leguay, Didier; Arnaud, Christophe; Goulletquer, Philippe; Kooijman, S.
A bio-energetic model, based on the DEB theory exists for the Pacific oyster Crassostrea gigas. Pouvreau et al. [Pouvreau, S., Bourles, Y., Lefebvre, S., Gangnery, A., Alunno-Bruscia, M., 2006. Application of a dynamic energy budget model to the Pacific oyster, C. gigas, reared under various environmental conditions. J. Sea Res. 56, 156–167.] successfully applied this model to oysters reared in three environments with no tide and low turbidity, using chlorophyll a concentration as food quantifier. However, the robustness of the oyster-DEB model needs to be validated in varying environments where different food quantifiers reflect the food available for oysters, as is the case in estuaries and most coastal ecosystems. We therefore tested the oyster-DEB...
Tipo: Text
Palavras-chave: Coastal Environment; Temperature effect; Food Quantifiers; Crassostrea gigas; Bivalves; Modelling; DEB theory.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6436.pdf

Evaluation of behavioral changes induced by a first step of domestication or selection for growth in the European sea bass (Dicentrarchus labrax): A self-feeding approach under repeated acute stress
Provedor de dados: 5
Autores: Millot, Sandie; Pean, Samuel; Leguay, Didier; Vergnet, Alain; Chatain, Beatrice; Begout, Marie-laure.
Among other strategies to improve fish welfare in rearing environment, domestication and/or selective breeding was proposed to minimize fish responsiveness to husbandry practices. To verify this hypothesis on a recently domesticated specie, the sea bass, Dicentrarchus labrax, L., an experiment was realized, using four populations differing according to their level of domestication or selection: one population produced from wild parents (Wild), one population produced from parents domesticated for one generation (Domesticated) and two produced from parents selected for growth for one generation (Selected A and Selected B). The experiment was carried out over 91 days with 600 fish (50 fish per tank, 150 fish per population). After a control period, the fish...
Tipo: Text
Palavras-chave: Feed intake; Feeding rhythm; Specific growth rate; Adaptation capacities; Welfare.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00011/12254/9030.pdf

Contrôle de surveillance 2016 DCE de la faune benthique de substrat meuble des masses d’eau de transition « Charente - FRFT01 » et « Seudre - FRFT02 » : rapport final
Provedor de dados: 5
Autores: Sauriau, Pierre Guy; Aubert, Fabien; Leguay, Didier; Prineau, Michel.
Tipo: Text
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00420/53109/54060.pdf

Effect of fasting on self-feeding activity in juvenile sea bass (Dicentrarchus labrax)
Provedor de dados: 5
Autores: Benhaim, David; Begout, Marie-laure; Pean, Samuel; Brisset, Blandine; Leguay, Didier; Chatain, Beatrice.
In various experiments under self-feeding conditions, sea bass groups could be divided into three categories regarding feeder actuation: high, low and zero-triggering fish. In all cases few high-triggering fish were responsible for a high percentage of the feed delivery. A question was raised about the role played by feeding motivation in such high-triggering status acquisition. It was approached by applying a 3-week fasting period in order to induce similar negative specific growth rate (SGR) in two groups of fish of similar mean weight but with either a low or a high coefficient of variation for weight (CVw)(T-low: CVw similar to 11%, 3 tanks of 60 fish each; T-high: CVw similar to 20%, 3 tanks of 60 fish each). These groups were created to test the...
Tipo: Text
Palavras-chave: Personality; Plasticity; Feeding-behaviour; Self-feeder; Social structure.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00069/18004/15672.pdf

Contrat de prestations Ifremer 2017 . Contrôle de surveillance 2017 DCE de la faune benthique de substrat meuble des masses d’eau côtière « FRFC01 Côte Nord-Est île d’Oléron » et « FRFC02 Pertuis Charentais » : rapport final
Provedor de dados: 5
Autores: Aubert, F; Jourde, J; Prineau, M; Leguay, Didier; Sauriau, Pg.
L’objet de ce document est d’exposer les résultats des suivis stationnels des invertébrés benthiques de substrats meubles subtidaux et intertidaux réalisé en avril 2017 conformément au protocoles DCE de 2014 (Garcia et al., 2014) sur : - la station subtidale Malconche, - la station subtidale d’appui Boyardville, et - les deux stations intertidales Bellevue et Les Doux
Tipo: Text
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00467/57905/60223.pdf

Consistency in European seabass coping styles: A life history approach
Provedor de dados: 5
Autores: Ferrari, Sebastien; Millot, Sandie; Leguay, Didier; Chatain, Beatrice; Begout, Marie-laure.
Recent years have seen a growth of interest in the consistent differences in individual behaviour over time and contexts constituting so-called “individual coping styles”. An understanding of this inter-individual variation is essential to improve our knowledge of the adaptive value of behaviour. Coping styles may have implications in diverse fields, so the development of appropriate screening methods for each species appears to be the most effective way to extend our knowledge and to incorporate behavioural responses into selection-based breeding programmes, to improve the domestication and welfare of farmed fish. We tested 30 juvenile seabass (Dicentrarchus labrax) at least twice in individual-based tests (feeding recovery in isolation, aggressiveness,...
Tipo: Text
Palavras-chave: Behavioural plasticity; Repeatability; Life stages; Dicentrarchus labrax.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00257/36814/35442.pdf

Paralytic shellfish poison outbreaks in the Penze estuary: Environmental factors affecting toxin uptake in the oyster, Crassostrea gigas
Provedor de dados: 5
Autores: Lassus, Patrick; Baron, Regis; Garen, Pierre; Truquet, Philippe; Masselin, Pierre; Bardouil, Michele; Leguay, Didier; Amzil, Zouher.
Several experiments using a self-regulated system were conducted to define the factors likely to influence the uptake of paralytic shellfish poison (PSP) by oysters in the Penze estuary (France, Brittany). Each 4-day experiment was carried out in a recirculated sea water system using 15 Pacific oysters (Crassostrea gigas) separated from each other and supplied with unfiltered natural seawater containing alternatively toxic (Alexandrium minutum) or non-toxic (Skeletonema costatum) algal diets. The food supply and exposure times to toxic diets were determined according to field studies of the Upstream and downstream movement of patches containing A. minutum. The experimental parameters corresponded roughly to the hydrological conditions generally observed in...
Tipo: Text
Palavras-chave: Experimental contamination; Oyster toxicity; Dinophyceae; Toxin; PSP.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-400.pdf

Early individual electronic identification of sea bass using RFID microtags: A first example of early phenotyping of sex-related growth
Provedor de dados: 5
Autores: Ferrari, Sebastien; Chatain, Beatrice; Cousin, Xavier; Leguay, Didier; Vergnet, Alain; Vidal, Marie-odile; Vandeputte, Marc; Begout, Marie-laure.
Although individual electronic tagging using PIT (Passive Integrated Transponder) tags is well established, it is mainly used for fish &gt; 60 mm in length. Since electronic tagging is an ideal identification method, we used RFID (Radio Frequency Identification) microtags (6 mm in length, 1 mm in diameter, 10 mg in mass) to characterize individual fish from the early stages of their development and throughout their lifecycles. We used sea bass, Dicentrarchus labrax, (105 day-old fish weighing between 100 and 1100 mg) and studied the effects of intra-coelomic tagging in half the population using different endpoints including survival and tag reading, growth over 6 months and swimming responses. Dead fish were counted daily, biometric data were collected at...
Tipo: Text
Palavras-chave: Tagging effects; Swimming behavior; Sexual dimorphism; Dicentrarchus labrax.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00175/28645/27072.pdf

Modélisation de la contamination des huîtres par les toxines d'Alexandrium minutum - Rapport final (2ème année)
Provedor de dados: 5
Autores: Lassus, Patrick; Bardouil, Michele; Baron, Regis; Garen, Pierre; Laabir, Mohamed; Leguay, Didier; Masselin, Pierre; Truquet, Philippe; Joret, Camille.
L'objectif de l'étude est de simuler les épisodes de contamination des huîtres par les toxines d'Alexandrium minufum à partir d'un module expérimental adapté, et en vue de construire un modèle de contamination applicable à cette espèce. Ce modèle sera ensuite susceptible d'être couplé au modèle biologique local (estuaire de Penzé) de déterminisme des blooms, ainsi qu'aux modèles hydrodynamiques développés par différentes équipes (Ifremer).
Tipo: Text
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00156/26712/24787.pdf

Systematic Screening of Behavioral Responses in Two Zebrafish Strains
Provedor de dados: 5
Autores: Vignet, Caroline; Begout, Marie-laure; Pean, Samuel; Lyphout, Laura; Leguay, Didier; Cousin, Xavier.
Wild-type (WT) zebrafish are commonly used in behavioral tests, but the term WT is not a precise description, and corresponds to many different strains (e.g., AB, TU, WIK, and others). Previous studies compared the physiological, behavioral, or metabolic characteristics of different zebrafish strains (indigenous WT populations versus laboratory WT strains). AB and TU are widely used, but at least one study has demonstrated behavioral differences between them. To choose the most appropriate strain for our experiments, we systematically screened behavioral responses of AB and TU fish in several assays. We analyzed the locomotion activity and responses to a light/dark challenge in adults and larvae, and exploratory behavior and color conditioning in adults....
Tipo: Text
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00172/28311/26606.pdf

Modelling growth and reproduction in the Pacific oyster Crassostrea gigas : 1. What's new with the oyster-DEB model?
Provedor de dados: 5
Autores: Bourles, Yves; Pouvreau, Stephane; Alunno-bruscia, Marianne; Leguay, Didier; Arnaud, Christophe; Goulletquer, Philippe; Kooijman, S. A. L. M.
Tipo: Text
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/acte-3330.pdf

Conditions d'apparition de densités accrues de dinoflagellés Dinophysis dans le pertuis d'Antioche et les eaux adjacentes. Campagnes Dinopertuis 89
Provedor de dados: 5
Autores: Delmas, Daniel; Herbland, Alain; Maestrini, Serge; Mornet, Francoise; Morand, Philippe; Spano, Anna-maria; Burgeot, Thierry; Margat, Sylvie; Charpentier, Gabriel; Fillon, Alain; Leguay, Didier; Thomas, Gerard; Bacher, Cedric; Heral, Maurice; Prou, Jean.
Environmental and species features which lead to increases in cell density of the D.S.P. Dinoflagellate Dinophysis in inshore and offshore waters of the île de Ré - île d'Oléron area, France (cruises "Dinopertuis89"). Four weekly sampling series have been carried out, within 10 May – 31 May 1989, at 24 stations located from inshore to offshore waters of the "île de Ré" - "île d’Oléron" area, with the aim to investigate (i) whether Dinophysis increases in cell density occur first in offshore waters and then, eventually, are pushed to the coast, or develop simultaneously in the whole area, and (ii) whether there are some environmental conditions which are related to Dinophysis blooms. Depths of sampling have been stated on the bas is of STD profiles. All...
Tipo: Text
Ano: 1990
URL: http://archimer.ifremer.fr/doc/00174/28532/26916.pdf

Unpredictability in food supply during early life influences growth and boldness in European Seabass, Dicentrarchus labrax
Provedor de dados: 5
Autores: Ferrari, Sebastien; Leguay, Didier; Vergnet, Alain; Vidal, Marie-odile; Chatain, Beatrice; Begout, Marie-laure.
Biological variability is no longer considered as statistical noise, but rather as an adaptive benefit. This variability comes from consistent differences in behavioral and physiological responses among individuals to a changing/challenging environment, named “coping style”, “temperament” or “personality”. Many studies have described how to characterize personality traits and how to assess their consistency over time and between different contexts; however, little is known about the environmental factors shaping personality development. Because contrasting personalities are maintained with evolution, this lead to the widespread assumption that genes play a predominant role in personality. In many cases, personality traits are however also likely to be...
Tipo: Text
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00333/44433/44100.pdf

Effect of size grading on sea bass (Dicentrarchus labrax) juvenile self- feeding behaviour, social structure and culture performance
Provedor de dados: 5
Autores: Benhaim, David; Pean, Samuel; Brisset, Blandine; Leguay, Didier; Begout, Marie-laure; Chatain, Beatrice.
This study aims to test the influence of size grading on self-feeding behaviour, social structure (measured by the percentage of triggering acts per individual), growth performances, and blood physiological variables of individually passive integrated transponder (PIT)-tagged sea bass juveniles, using a computerized on-demand feeding system coupled with a PIT tag monitoring device. Three consecutive periods of 27 days each were compared: a first period (P1) before grading (6 tanks of 100 fish; 40.2 +/- 8.9 g) followed by a second period (P2) after grading. The protocol applied aimed to create two groups of fish of similar mean weight but with either a low or a high coefficient of variation of weight (CV(w)) corresponding to an imposed difference in social...
Tipo: Text
Palavras-chave: Feeding behaviour; Self feeder; Triggering activity; Heterogeneity; Growth; Grading.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00057/16858/14340.pdf

Etude de la salubrité de l'Anse de l'Aiguillon 1996-1997
Provedor de dados: 5
Autores: Leguay, Didier.
Les arrêtés préfectoraux n°96.979 du 09 avril 1996 pour la Charente-Maritime et n°96.019 du 23 mai 1996 pour la Vendée, portant classement de salubrité des zones de production conchylicoles, ont défini pour chaque département respectif des zones géographiques, et leur ont attribué un statut sanitaire. L'entité "Anse de l'Aiguillon" est séparée en deux par la Sèvre Niortaise qui constitue une limite naturelle et administrative, elle est de ce fait gérée par les deux Directions Départementales des Affaires Maritimes de Vendée et de Charente-Maritime. La partie Vendéenne a été numérotée 85-11 et la partie charentaise 17-01.  L'Anse de l'Aiguillon, dans son ensemble, a fait l'objet d'un classement "A provisoire", en l'attente d'informations complémentaires...
Tipo: Text
Palavras-chave: Zones conchylicoles; Salubrité; Etude de zone; Microbiologie; Anse Aiguillon.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00149/26028/24128.pdf