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Registros recuperados: 28
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Body Girth as an Alternative to Body Mass for Establishing Condition Indexes in Field Studies: A Validation in the King Penguin ArchiMer
Viblanc, Vincent A.; Bize, Pierre; Criscuolo, Francois; Le Vaillant, Maryline; Saraux, Claire; Pardonnet, Sylvia; Gineste, Benoit; Kauffmann, Marion; Prud'Homme, Onesime; Handrich, Yves; Massemin, Sylvie; Groscolas, Rene; Robin, Jean-patrice.
Body mass and body condition are often tightly linked to animal health and fitness in the wild and thus are key measures for ecophysiologists and behavioral ecologists. In some animals, such as large seabird species, obtaining indexes of structural size is relatively easy, whereas measuring body mass under specific field circumstances may be more of a challenge. Here, we suggest an alternative, easily measurable, and reliable surrogate of body mass in field studies, that is, body girth. Using 234 free-living king penguins (Aptenodytes patagonicus) at various stages of molt and breeding, we measured body girth under the flippers, body mass, and bill and flipper length. We found that body girth was strongly and positively related to body mass in both molting...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00098/20918/18590.pdf
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Body reserves mediate trade-offs between life-history traits: new insights from small pelagic fish reproduction ArchiMer
Brosset, Pablo; Lloret, Josep; Munoz, Marta; Fauvel, Christian; Van Beveren, Elisabeth; Marques, Virginie; Fromentin, Jean-marc; Menard, Frederic; Saraux, Claire.
Limited resources in the environment prevent individuals from simultaneously maximizing all life-history traits, resulting in trade-offs. In particular, the cost of reproduction is well known to negatively affect energy investment in growth and maintenance. Here, we investigated these trade-offs during contrasting periods of high versus low fish size and body condition (before/after 2008) in the Gulf of Lions. Female reproductive allocation and performance in anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus) were examined based on morphometric historical data from the 1970s and from 2003 to 2015. Additionally, potential maternal effects on egg quantity and quality were examined in 2014/2015. After 2008, the gonadosomatic index increased for...
Tipo: Text Palavras-chave: Maternal effect; Northwest Mediterranean; Anchovy; Sardine.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00353/46458/46233.pdf
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Carry-over body mass effect from winter to breeding in a resident seabird, the little penguin ArchiMer
Salton, Marcus; Saraux, Claire; Dann, Peter; Chiaradia, André.
Using body mass and breeding data of individual penguins collected continuously over 7 years (2002–2008), we examined carry-over effects of winter body mass on timing of laying and breeding success in a resident seabird, the little penguin (Eudyptula minor). The austral winter month of July consistently had the lowest rate of colony attendance, which confirmed our expectation that penguins work hard to find resources at this time between breeding seasons. Contrary to our expectation, body mass in winter (July) was equal or higher than in the period before (‘moult-recovery’) and after (‘pre-breeding’) in 5 of 7 years for males and in all 7 years for females. We provided evidence of a carry-over effect of body mass from winter to breeding; females and males...
Tipo: Text Palavras-chave: Capital-income breeding; Penguin monitoring system; Parental investment; Timing of laying; Breeding success; Seabirds.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00253/36431/34976.pdf
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Effects of extraction method and storage of dry tissue on marine lipids and fatty acids ArchiMer
Sardenne, Fany; Bodin, Nathalie; Metral, Luisa; Crottier, Anais; Le Grand, Fabienne; Bideau, Antoine; Brisset, Blandine; Bourjea, Jerome; Saraux, Claire; Bonhommeau, Sylvain; Kerzerho, Vincent; Bernard, Serge; Rouyer, Tristan.
Various protocols are currently used to study marine lipids, but there is a growing interest in working on dry samples that are easier to transport. However, reference protocols are still lacking for dry samples. In order to make recommendations on this use, lipid classes and fatty acids (FA) obtained from six analytical protocols using two different tissue states (dry vs wet) and three extraction methods (automat vs manual potter vs leaving the solvent to work on tissue) were compared. Three dry storage modes of tissue (freezer vs gas nitrogen vs dry room) during one and three months were also compared. These comparisons were made on seven marine species with different lipid profiles, including fishes, crustaceans and mollusks. Lipid classes and FA...
Tipo: Text Palavras-chave: Degradation; Freeze-drying; Lyophilization; Lipid class; Marine animal; Protocol.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00467/57898/60189.pdf
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Energetic adjustments in freely breeding-fasting king penguins: does colony density matter? ArchiMer
Viblanc, Vincent A.; Saraux, Claire; Malosse, Nelly; Groscolas, Rene.
1. For seabirds that forage at sea but breed while fasting on land, successful reproduction depends on the effective management of energy stores. Additionally, breeding often means aggregating in dense colonies where social stress may affect energy budgets. 2. Male king penguins (Aptenodytes patagonicus) fast for remarkably long periods (up to 1 center dot 5months) while courting and incubating ashore. Although their fasting capacities have been well investigated in captivity, we still know very little about the energetics of freely breeding birds. 3. We monitored heart rate (HR, a proxy to energy expenditure), body temperature and physical activity of male king penguins during their courtship and first incubation shift in a colony of some 24000 freely...
Tipo: Text Palavras-chave: Social density; Body temperature; Seabird; Fasting; Stress; Physical activity; Heart rate; Energy expenditure.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00193/30447/29090.pdf
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Food in the Sea: Size Also Matters for Pelagic Fish ArchiMer
Queiros, Quentin; Fromentin, Jean-marc; Gasset, Eric; Dutto, Gilbert; Huiban, Camille; Metral, Luisa; Leclerc, Lina; Schull, Quentin; Mckenzie, David; Saraux, Claire.
Small pelagic fish are key components of marine ecosystems and fisheries worldwide. Despite the absence of recruitment failure and overfishing, pelagic fisheries have been in crisis for a decade in the Western Mediterranean Sea because of a marked decline in sardine size and condition. This situation most probably results from bottom-up control and changes in the plankton community toward smaller plankton. To understand such an unusual phenomenon, we developed an original and innovative experimental approach investigating the mechanisms induced by a reduction in the quantity and size of sardine prey. While experimentations offer the unique opportunity to integrate behavior and ecophysiology in understanding key demographic processes, they remain rarely...
Tipo: Text Palavras-chave: Experimentation; Small pelagics; Sardina pilchardus; Body condition; Bottom-up control.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00505/61669/65585.pdf
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Habitat Suitability Modeling to Identify the Potential Nursery Grounds of the Atlantic Mackerel and Its Relation to Oceanographic Conditions in the Mediterranean Sea ArchiMer
Giannoulaki, Marianna; Pyrounaki, Maria M.; Bourdeix, Jean-herve; Ben Abdallah, Lotfi; Bonanno, Angelo; Basilone, Gualtiero; Iglesias, Magdalena; Ventero, Ana; De Felice, Andrea; Leonori, Iole; Valavanis, Vasilis D.; Machias, Athanassios; Saraux, Claire.
Our knowledge for the distribution of Atlantic mackerel (Scomber scombrus) in the Mediterranean Sea is limited and fragmented. In the current work habitat suitability modeling was applied to summer acoustic surveys data of Atlantic mackerel juveniles derived from the north part of the Mediterranean (i.e., acoustic data from the Gulf of Lions, pelagic trawls held during acoustic surveys in Spanish Mediterranean waters, south Adriatic Sea, Strait of Sicily, and North Aegean Sea) using generalized additive models (GAMs) along with satellite environmental and bathymetry data. Bathymetry along with sea surface temperature and circulation patterns, expressed through sea level anomaly and the zonal component of the absolute geostrophic velocity, were the...
Tipo: Text Palavras-chave: Habitat suitability modeling; Atlantic mackerel; Nursery grounds; Mediterranean Sea; Generalized additive models; Acoustic surveys.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00395/50657/51347.pdf
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Importance of coastal Marine Protected Areas for the conservation of pelagic seabirds: The case of Vulnerable yelkouan shearwaters in the Mediterranean Sea ArchiMer
Peron, Clara; Gremillet, David; Prudor, Aurelien; Pettex, Emeline; Saraux, Claire; Soriano-redondo, Andrea; Authier, Matthieu; Fort, Jerome.
Marine Protected Areas (MPAs) are being established across all marine regions but their validity for the conservation of highly mobile marine vertebrates has been questioned. We tested the hypothesis that French coastal MPAs primarily designed for coastal and benthic biota are also beneficial for the conservation of a pelagic seabird, the Vulnerable yelkouan shearwater (Puffinus yelkouan), an endemic species to the Mediterranean Sea. We used a vast spectrum of electronic devices (GPS, temperature-depth-recorders, satellite transmitters and geolocators) and stable isotopic analyses to study the year-round movements and the trophic status of yelkouan shearwaters from the Hyères archipelago (France). In addition we conducted large-scale ship and aircrafts...
Tipo: Text Palavras-chave: Aerial surveys; At-sea observations; Biotelemetry; Conservation biogeography; Spatial planning; Stable isotope analysis.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00163/27460/26393.pdf
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Influence of environmental variability and age on the body condition of small pelagic fish in the Gulf of Lions ArchiMer
Brosset, Pablo; Menard, Frederic; Fromentin, Jean-marc; Bonhommeau, Sylvain; Ulses, Caroline; Bourdeix, Jean-herve; Bigot, Jean-louis; Van Beveren, Elisabeth; Roos, David; Saraux, Claire.
Endogenous and environmental variables are fundamental in explaining variations in fish condition. Based on more than 20 yr of fish weight and length data, relative condition indices were computed for anchovy and sardine caught in the Gulf of Lions. Classification and regression trees (CART) were used to identify endogenous factors affecting fish condition, and to group years of similar condition. Both species showed a similar annual cycle with condition being minimal in February and maximal in July. CART identified 3 groups of years where the fish populations generally showed poor, average and good condition and within which condition differed between age classes but not according to sex. In particular, during the period of poor condition (mostly recent...
Tipo: Text Palavras-chave: Anchovy; Sardine; Relative condition factor; NW Mediterranean Sea; Endogenous effect; Environmental effect.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00272/38334/36575.pdf
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Inter-Annual Variability of Fledgling Sex Ratio in King Penguins ArchiMer
Bordier, Celia; Saraux, Claire; Viblanc, Vincent A.; Gachot-neveu, Helene; Beaugey, Magali; Le Maho, Yvon; Le Bohec, Céline.
As the number of breeding pairs depends on the adult sex ratio in a monogamous species with biparental care, investigating sex-ratio variability in natural populations is essential to understand population dynamics. Using 10 years of data (20002009) in a seasonally monogamous seabird, the king penguin (Aptenodytes patagonicus), we investigated the annual sex ratio at fledging, and the potential environmental causes for its variation. Over more than 4000 birds, the annual sex ratio at fledging was highly variable (ranging from 44.4% to 58.3% of males), and on average slightly biased towards males (51.6%). Yearly variation in sex-ratio bias was neither related to density within the colony, nor to global or local oceanographic conditions known to affect both...
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Ano: 2014 URL: http://archimer.ifremer.fr/doc/00248/35916/34452.pdf
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La force de l’observation pérenne, la synergie de l’intégration numérique. Suivi des populations halieutiques et de mammifères marins du golfe du Lion ArchiMer
Jadaud, Angelique; Saraux, Claire; Rouyer, Tristan.
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00487/59829/62972.pdf
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La surexploitation des ressources halieutiques dans le golfe du Lion ArchiMer
Jadaud, Angelique; Saraux, Claire.
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00487/59823/62966.pdf
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Linking small pelagic dietary shifts with ecosystem changes in the Gulf of Lions ArchiMer
Brosset, Pablo; Le Bourg, Baptiste; Costalago, David; Banaru, Daniela; Van Beveren, Elisabeth; Bourdeix, Jean-herve; Fromentin, Jean-marc; Menard, Frederic; Saraux, Claire.
Since 2008, a severe decrease in size and body condition together with a demographic truncation has been observed in the sardine (secondarily in anchovy) population of the Gulf of Lions (NW Mediterranean Sea). In parallel, sprat biomass, which was negligible before, has increased tenfold. All of these changes have strongly affected the regional fisheries. Using trophic and isotopic data from contrasting periods of low versus high growth and condition, we investigated potential changes in diet and interspecific feeding interactions through time. Evidence of resource partitioning was found between sprat and both anchovy and sardine in 2004 and 2005. Since 2010, the isotopic niches of the 3 species have tended to overlap, suggesting higher risk of competition...
Tipo: Text Palavras-chave: Trophic ecology; Anchovy; Sardine; Sprat; Dietary overlap; NW Mediterranean.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00347/45822/45540.pdf
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Maternal oxidative stress and reproduction: testing the constraint, cost and shielding hypotheses in a wild mammal ArchiMer
Viblanc, Vincent A.; Schull, Quentin; Roth, Jeffrey D.; Rabdeau, Juliette; Saraux, Claire; Uhlrich, Pierre; Criscuolo, François; Dobson, F. Stephen.
1.Oxidative stress has been proposed as a central causal mechanism underlying the life history trade-off between current and future reproduction and survival in wild animals. 2.Whereas mixed evidence suggests that maternal oxidative stress may act both as a constraint and a cost to reproduction, some studies have reported a lack of association between reproduction and maternal oxidative stress. 3.The oxidative shielding hypothesis offers an alternative explanation, suggesting that mothers may pre-emptively mitigate the oxidative costs of reproduction by increasing antioxidant defences prior to reproduction. 4.We tested the oxidative constraint, cost, and shielding hypotheses using a longitudinal field study of oxidative stress levels in a species that...
Tipo: Text Palavras-chave: Antioxidant; Body condition; Cost of reproduction; Life history; Mammal; Mitochondria; Trade-off.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00415/52679/53542.pdf
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Measurement and analysis of small pelagic fish condition: A suitable method for rapid evaluation in the field ArchiMer
Brosset, Pablo; Fromentin, Jean-marc; Menard, Frederic; Pernet, Fabrice; Bourdeix, Jean-herve; Bigot, Jean-louis; Van Beveren, Elisabeth; Perez Rodia, Maria A.; Choy, Sandrine; Saraux, Claire.
As condition is a key variable in population dynamics (especially for survival, growth and reproduction), the use of well-defined and accurate fish condition indices is capital. In particular, condition indices (morphometric, bioenergetic and biochemical) have never been compared and validated for the European anchovy Engraulis encrasicolus, the European pilchard Sardina pilchardus and the European sprat Sprattus sprattus. The accuracy of two indirect methods, the morphometric relative condition index Kn and the bioenergetics index determined with the Distell Fish Fatmeter was investigated by comparing with a direct measure of relative lipid content carried out with a thin layer chromatography-flame ionization detector. Estimations from the fatmeter...
Tipo: Text Palavras-chave: Anchovy; Fatmeter; Lipids; Mediterranean Sea; Sardine; Sprat.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00226/33741/32304.pdf
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Negative effects of wind speed on individual foraging performance and breeding success in little penguins ArchiMer
Saraux, Claire; Chiaradia, Andre; Salton, Marcus; Dann, Peter; Viblanc, Vincent A..
Most effects of environmental and climate variability on predator life history traits and population dynamics result from indirect effects mediated through the food chain. There is growing evidence that wind strength might affect seabirds while foraging at sea. Here, we investigated the effect of wind speed on the foraging performance of a flightless marine predator, the little penguin (Eudyptula minor). To this end, we used satellite-derived wind data collected over 11 breeding seasons during which the daily attendance and body mass changes of more than 200 penguins breeding at Phillip Island (Victoria, Australia) were recorded by an automated penguin monitoring system. Over 17 363 foraging trips, we found that wind speed had important effects on foraging...
Tipo: Text Palavras-chave: Body condition; Chick rearing; Climate change vs. climate variability; Eudyptula minor; Extreme events; Seabird.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00318/42964/42469.pdf
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Pourquoi les anchois et les sardines du golfe du Lion disparaissent de vos étals ? ArchiMer
Saraux, Claire.
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00486/59817/62960.pdf
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Prey predator interactions in the face of management regulations: changes in Mediterranean small pelagics are not due to increased tuna predation ArchiMer
Van Beveren, Elisabeth; Fromentin, Jean-marc; Bonhommeau, Sylvain; Nieblas, Anne-elise; Metral, Luisa; Brisset, Blandine; Jusup, Marko; Bauer, Robert Klaus; Brosset, Pablo; Saraux, Claire.
Thunnus thynnus Sardina pilchardus Engraulis encrasicolus
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Ano: 2017 URL: https://archimer.ifremer.fr/doc/00371/48215/50340.pdf
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Rapid changes in growth, condition, size and age of small pelagic fish in the Mediterranean ArchiMer
Van Beveren, Elisabeth; Bonhommeau, Sylvain; Fromentin, Jean-marc; Bigot, Jean-louis; Bourdeix, Jean-herve; Brosset, Pablo; Roos, David; Saraux, Claire.
Since 2007, the ecosystem of the Gulf of Lions has shifted to a different regime, characterised by a low anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus) biomass and a remarkably high sprat (Sprattus sprattus) biomass. Surprisingly, the abundance and recruitment of anchovy and sardine remained high. To understand which processes (bottom-up or top-down control, etc.) could have caused this shift, we studied the changes in body condition, growth and size and age of anchovy, sardine and sprat over 1984–1985 and 1992–2012, using data from scientific surveys. The annual age structure of anchovy and sardine was estimated using Bayesian mixture models based on size frequency data with priors on the age–length relationship derived from independent...
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Ano: 2014 URL: http://archimer.ifremer.fr/doc/00192/30335/29917.pdf
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Short-term prey field lability constrains individual specialisation in resource selection and foraging site fidelity in a marine predator ArchiMer
Courbin, Nicolas; Besnard, Aurelien; Peron, Clara; Saraux, Claire; Fort, Jerome; Perret, Samuel; Tornos, Jeremy; Gremillet, David.
Spatio-temporally stable prey distributions coupled with individual foraging site fidelity are predicted to favour individual resource specialisation. Conversely, predators coping with dynamic prey distributions should diversify their individual diet and/or shift foraging areas to increase net intake. We studied individual specialisation in Scopoli’s shearwaters (Calonectris diomedea) from the highly dynamic Western Mediterranean, using daily prey distributions together with resource selection, site fidelity and trophic-level analyses. As hypothesised, we found dietary diversification, low foraging site fidelity and almost no individual specialisation in resource selection. Crucially, shearwaters switched daily foraging tactics, selecting areas with...
Tipo: Text Palavras-chave: Behavioural consistency; Calonectris diomedea; Foraging site fidelity; Resource selection; Scopoli's shearwater; Temporal resource dynamic; Western Mediterranean.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00437/54859/56479.pdf
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