Consulta: creatorFacets:"Saraux, Claire"
Registros recuperados: 31
Data/hora: 10/06/2024 10:14:53

Carry-over body mass effect from winter to breeding in a resident seabird, the little penguin
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

Muscle bioenergetics of two emblematic Mediterranean fish species: Sardina pilchardus and Sparus aurata
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Teulier, Loïc; Thoral, Elisa; Queiros, Quentin; Mckenzie, David; Roussel, Damien; Dutto, Gilbert; Gasset, Eric; Bourjea, Jerome; Saraux, Claire.
We investigated links between swimming behavior and muscle bioenergetics in two emblematic Mediterranean fish species that have very different ecologies and activity levels. European sardines Sardina pilchardus are pelagic, they swim aerobically, school constantly and have high muscle fat content. Gilthead seabream Sparus aurata are bentho-pelagic, they show discontinuous spontaneous swimming patterns and store less fat in their muscle. Estimating the proportion of red and white muscle phenotypes, sardine exhibited a larger proportion of red muscle (~10% of the body mass) compared to gilthead seabream (~5% of the body mass). We firstly studied red and white muscle fiber bioenergetics, using high-resolution respirometers, showing a 4-fold higher oxidation...
Tipo: Text
Palavras-chave: Red muscle; Bioenergetics; Marine fishes; Lipids.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00502/61390/65054.pdf

Maternal oxidative stress and reproduction: testing the constraint, cost and shielding hypotheses in a wild mammal
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

Trophic niche overlap of sprat and commercial small pelagic teleosts in the Gulf of Lions (NW Mediterranean Sea)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Le Bourg, B.; Banaru, Daniela; Saraux, Claire; Nowaczyk, A.; Le Luherne, E.; Jadaud, Angelique; Bigot, Jean-louis; Richard, P.
Increasing abundance of non-commercial sprats and decreasing biomass and landings of commercial anchovies and sardines justify the need to study the feeding ecology and trophic niche overlap of these planktivorous species in the Gulf of Lions. Their diet has been investigated on the basis of stomach content and stable isotope analyses in 2011 and 2012 according to different depths and regions in the study area. The main prey were Corycaeidae copepods, Clauso/Paracalanus, Euterpina acutifrons and Microsetella, for sprats and small copepods, such as Microsetella, Oncaea and Corycaeidae, for anchovies and sardines. This is the first time that the diet of sprats is described in the Gulf of Lions. Sprats fed on a larger size spectrum of prey and seem to be more...
Tipo: Text
Palavras-chave: Anchovies; Sardines; Sprats; North-western Mediterranean sea; Stomach contents; Stable isotopes.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00272/38314/38625.pdf

Linking small pelagic dietary shifts with ecosystem changes in the Gulf of Lions
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

Understanding the Population Structure of the European Anchovy (Engraulis encrasicolus) in the Black Sea, Mediterranean Sea and Northeast Atlantic Ocean by Using Otolith Shape Analysis
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Akkus, Gizem; Jemaa, Sharif; Cemal Gucu, Ali; Marchal, Paul; Carbonara, Pierluigi; Bacha, Mahmoud; Amara, Rachid; Ernande, Bruno; Saraux, Claire; Mahe, Kelig.
European anchovy, Engraulis encrasicolus, is a small pelagic coastal marine fish largely spread from the North Sea to central Africa, including the entire Mediterranean and the Black and Azov Seas. The aim of the study is to understand the potential different population structure and their relationship between the Northeast Atlantic, Western, Eastern Mediterranean and the Black Sea anchovy population. The outlines of 2127 sagittal otoliths were collected from nineteen locations (English Channel, Atlantic, the Mediterranean and Black Sea), and added to existing information available from a previous study. Elliptical Fourier Analysis (EFA) was used to analyze the otolith shape variations among locations. Before examining the geographical differentiation by...
Tipo: Text
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00436/54722/56157.pdf

Effects of extraction method and storage of dry tissue on marine lipids and fatty acids
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

Negative effects of wind speed on individual foraging performance and breeding success in little penguins
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

Rapid changes in growth, condition, size and age of small pelagic fish in the Mediterranean
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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...
Tipo: Text
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00192/30335/29917.pdf

Measurement and analysis of small pelagic fish condition: A suitable method for rapid evaluation in the field
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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: https://archimer.ifremer.fr/doc/00226/33741/32304.pdf

Telomere length reflects individual quality in free-living adult king penguins
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Le Vaillant, Maryline; Viblanc, Vincent A.; Saraux, Claire; Le Bohec, Celine; Le Maho, Yvon; Kato, Akiko; Criscuolo, Francois; Ropert-coudert, Yan.
Growing evidence suggests that telomeres, non-coding DNA sequences that shorten with age and stress, are related in an undefined way to individual breeding performances and survival rates in several species. Short telomeres and elevated shortening rates are typically associated with life stress and low health. As such, telomeres could serve as an integrative proxy of individual quality, describing the overall biological state of an individual at a given age. Telomere length could be associated with the decline of an array of physiological traits in age-controlled individuals. Here, we investigated the links between individuals' relative telomere length, breeding performance and various physiological (body condition, natural antibody levels) and life...
Tipo: Text
Palavras-chave: Breeding performances; Long-lived seabird; Natural antibody level; Body condition.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00302/41327/41093.pdf

La force de l’observation pérenne, la synergie de l’intégration numérique. Suivi des populations halieutiques et de mammifères marins du golfe du Lion
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Jadaud, Angelique; Saraux, Claire; Rouyer, Tristan.
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00487/59829/62972.pdf

La surexploitation des ressources halieutiques dans le golfe du Lion
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Jadaud, Angelique; Saraux, Claire.
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00487/59823/62966.pdf

Habitat Suitability Modeling to Identify the Potential Nursery Grounds of the Atlantic Mackerel and Its Relation to Oceanographic Conditions in the Mediterranean Sea
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

The fisheries history of small pelagics in the Northern Mediterranean
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Van Beveren, Elisabeth; Fromentin, Jean-marc; Rouyer, Tristan; Bonhommeau, Sylvain; Brosset, Pablo; Saraux, Claire.
Since 2007, the biomass of sardine and anchovy in the NW Mediterranean has remained persistently low, whereas the biomass of the commercially low-valued sprat has exploded. Also, simultaneous decreases in condition, size, and/or age of these populations were observed. Altogether, this resulted in a drop in landings of small pelagics. To understand the amplitude of these events and to provide a baseline scenario against which current changes can be compared, we compiled exceptionally long landing series (1865–2013) of sardine, anchovy, and mackerel for different subregions of the southern French coast. We characterized the fluctuations of these landings and compared these with environmental drivers (sea surface temperature, Rhône river discharge, North...
Tipo: Text
Palavras-chave: Anchovy; Fish landings; Gulf of Lions; Historical time series; Mackerel; Sardine.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00319/43001/42561.pdf

Réponse à la saisine DPMA 13-5548 sur l’analyse des actions nécessaires pour la mise en œuvre du suivi et de l’évaluation scientifique des plans de gestion Méditerranée.
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Le Corre, Gildas; Rouyer, Tristan; Jadaud, Angelique; Saraux, Claire; Bigot, Jean-louis; Demaneche, Sebastien.
Tipo: Text
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00169/28051/79935.pdf

Prey predator interactions in the face of management regulations: changes in Mediterranean small pelagics are not due to increased tuna predation
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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
Tipo: Text
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00371/48215/50340.pdf

Energetic adjustments in freely breeding-fasting king penguins: does colony density matter?
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

Short-term prey field lability constrains individual specialisation in resource selection and foraging site fidelity in a marine predator
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

Body reserves mediate trade-offs between life-history traits: new insights from small pelagic fish reproduction
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

Spatio-temporal patterns and environmental controls of small pelagic fish body condition from contrasted Mediterranean areas
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Brosset, Pablo; Fromentin, Jean-marc; Van Beveren, Elisabeth; Lloret, Josep; Marques, Virginie; Basilone, Gualtiero; Bonanno, Angelo; Carpi, Piera; Donato, Fortunata; Kec, Vanja Cikes; De Felice, Andrea; Ferreri, Rosalia; Gasparevic, Denis; Giraldez, Ana; Gucu, Ali; Iglesias, Magdalena; Leonori, Iole; Palomera, Isabel; Somarakis, Stylianos; Ticina, Vjekoslav; Torres, Pedro; Ventero, Ana; Zorica, Barbara; Menard, Frederic; Saraux, Claire.
Small pelagic fish are among the most ecologically and economically important marine fish species and are characterized by large fluctuations all over the world. In the Mediterranean Sea, low catches and biomass of anchovies and sardines have been described in some areas during the last decade, resulting in important fisheries crises. Therefore, we studied anchovy and sardine body condition variability, a key index of population health and its response to environmental and anthropogenic changes. Wide temporal and spatial patterns were investigated by analyzing separately data from scientific surveys and fisheries in eight Mediterranean areas between 1975 and 2015.  Results showed that anchovy and sardine body condition as well as maximum size in some areas...
Tipo: Text
Palavras-chave: Anchovy; Sardine; Fish health; Marine monitoring.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00363/47400/47936.pdf

Inter-Annual Variability of Fledgling Sex Ratio in King Penguins
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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...
Tipo: Text
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00248/35916/34452.pdf

Influence of environmental variability and age on the body condition of small pelagic fish in the Gulf of Lions
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

Body Girth as an Alternative to Body Mass for Establishing Condition Indexes in Field Studies: A Validation in the King Penguin
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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...
Tipo: Text
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00098/20918/18590.pdf

Food in the Sea: Size Also Matters for Pelagic Fish
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

Spatial Structure and Distribution of Small Pelagic Fish in the Northwestern Mediterranean Sea
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Saraux, Claire; Fromentin, Jean-marc; Bigot, Jean-louis; Bourdeix, Jean-herve; Morfin, Marie; Roos, David; Van Beveren, Elisabeth; Bez, Nicolas.
Understanding the ecological and anthropogenic drivers of population dynamics requires detailed studies on habitat selection and spatial distribution. Although small pelagic fish aggregate in large shoals and usually exhibit important spatial structure, their dynamics in time and space remain unpredictable and challenging. In the Gulf of Lions (north-western Mediterranean), sardine and anchovy biomasses have declined over the past 5 years causing an important fishery crisis while sprat abundance rose. Applying geostatistical tools on scientific acoustic surveys conducted in the Gulf of Lions, we investigated anchovy, sardine and sprat spatial distributions and structures over 10 years. Our results show that sardines and sprats were more coastal than...
Tipo: Text
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00226/33739/32151.pdf

Primary production and depth drive different trophic structure and functioning of fish assemblages in French marine ecosystems
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Cresson, Pierre; Chouvelon, Tiphaine; Bustamante, Paco; Bănaru, Daniela; Baudrier, Jerome; Le Loch, Francois; Mauffret, Aourell; Mialet, Benoit; Spitz, Jérome; Wessel, Nathalie; Briand, Marine; Denamiel, Margaux; Doray, Mathieu; Guillou, Gaël; Jadaud, Angelique; Lazard, Coline; Noûs, Camille; Prieur, Solène; Rouquette, Manuel; Saraux, Claire; Serre, Sandrine; Timmerman, Charles-andre; Verin, Yves; Harmelin-vivien, Mireille.
Investigating the drivers of fish assemblage trophic structure is a critical question, in order to better understand ecosystem functioning, predict the effects of perturbations and implement integrated management of exploited marine ecosystems. Ecosystemic surveys enabled the determination of the trophic structure of the fish assemblages in three French marine ecosystems, namely the Eastern English Channel, the Bay of Biscay and the Gulf of Lions, through the simultaneous collection of qualitative (stable isotopes and energy content) and quantitative (biomass) data. In the Bay of Biscay and in the Gulf of Lions, pelagic primary production supported at least 80% of the fish biomass production, and explained the dominance of pelagic species, but with...
Tipo: Text
Palavras-chave: Fish community; Trophodynamics; Food webs; Benthic-pelagic coupling.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00629/74120/73562.pdf

Small pelagic fish dynamics: a review of mechanisms in the Gulf of Lions
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Saraux, Claire; Van Beveren, Elisabeth; Brosset, Pablo; Queiros, Quentin; Bourdeix, Jean-herve; Dutto, Gilbert; Gasset, Eric; Jac, Cyrielle; Bonhommeau, Sylvain; Fromentin, Jean-marc.
Around 2008, an ecosystem shift occurred in the Gulf of Lions, highlighted by considerable changes in biomass and fish mean weight of its two main small pelagic fish stocks (European anchovy, Engraulis encrasicolus; European sardine, Sardina pilchardus). Surprisingly these changes did not appear to be mediated by a decrease in fish recruitment rates (which remained high) or by a high fishing pressure (exploitation rates being extremely low). Here, we review the current knowledge on the population's dynamics and its potential causes. We used an integrative ecosystem approach exploring alternative hypotheses, ranging from bottom-up to top-down control, not forgetting epizootic diseases. First, the study of multiple population characteristics highlighted a...
Tipo: Text
Palavras-chave: Population dynamics; Top-down; Disease; Zooplankton; Exploited species; Bottom-up.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00427/53861/54903.pdf

Importance of coastal Marine Protected Areas for the conservation of pelagic seabirds: The case of Vulnerable yelkouan shearwaters in the Mediterranean Sea
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

Pourquoi les anchois et les sardines du golfe du Lion disparaissent de vos étals ?
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Saraux, Claire.
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00486/59817/62960.pdf

Starting with a handicap: phenotypic differences between early- and late-born king penguin chicks and their survival correlates
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Stier, Antoine; Viblanc, Vincent A.; Massemin-challet, Sylvie; Handrich, Yves; Zahn, Sandrine; Rojas, Emilio R.; Saraux, Claire; Le Vaillant, Maryline; Prud'Homme, Onesime; Grosbellet, Edith; Robin, Jean-patrice; Bize, Pierre; Criscuolo, Francois.
1.  The exceptionally long (c. 11 months) growth period of king penguin chicks (Aptenodytes patagonicus) is interrupted by the Austral winter. As a consequence, penguin chicks born late in the breeding season have little time to build-up their energy reserves before the drastic energy bottleneck they experience during winter and face greater risks of mortality than early-born chicks.  2.  Whereas it is well known that breeding adults alternate between early- and late-breeding attempts, little is known on the phenotype of early- and late-chicks, and on the potential existence of specific adaptive phenotypic responses in late-born individuals.  3.  We investigated phenotypic differences between early- and late-chicks and tested their survival correlates both...
Tipo: Text
Palavras-chave: Early-life conditions; Phenotypic plasticity; Oxidative stress; Individual quality; Growth; Telomere; Corticosterone; Reproductive timing.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00170/28175/32107.pdf