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A multitracer approach to assess the spatial contamination pattern of hake (Merluccius merluccius) in the French Mediterranean 5
Cresson, Pierre; Bouchoucha, Marc; Morat, Fabien; Miralles, Francoise; Chavanon, Fabienne; Loizeau, Veronique; Cossa, Daniel.
Chemical contamination levels and stable isotope ratios provide integrated information about contaminant exposure, trophic position and also biological and environmental influences on marine organisms. By combining these approaches with otolith shape analyses, the aim of the present study was to document the spatial variability of Hg and PCB contamination of the European hake (Merluccius merluccius) in the French Mediterranean, hypothesizing that local contaminant sources, environmental conditions and biological specificities lead to site-specific contamination patterns. High Hg concentrations discriminated Corsica (average: 1.36 ± 0.80 μg g− 1 dm) from the Gulf of Lions (average values < 0.5 μg g− 1 dm), where Rhône River input caused high PCB burdens....
Tipo: Text Palavras-chave: Hg; Mediterranean; Merluccius merluccius; Multiple ecotracers; PCB.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00270/38155/36309.pdf
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Size-effect, asymmetry, and small-scale spatial variation in otolith shape of juvenile sole in the Southern North Sea 5
Delerue-ricard, Sophie; Hanna, Stynen; Barbut, Léo; Morat, Fabien; Mahe, Kelig; Hablützel, Pascal I.; Hostens, Kris; Volckaert, Filip.
While otolith shape analysis can provide a valuable tool for discriminating between fish populations, factors which may influence otolith shape, such as the effect of size, directional asymmetry in growth, and local environmental conditions, are often unknown. Here, we analyzed differences in otolith shape across three size classes of age-0 common sole Solea solea L. from nursery grounds off the Belgian coast and in the Wadden Sea. Across size classes, form-factor decreased and roundness remained consistently high in both nursery grounds, while ellipticity increased in the Belgian nursery. Directional asymmetry between left and right otoliths measured by Fourier coefficients accounted for 0.96 and 7.2% of the variance when comparing otoliths overall, and...
Tipo: Text Palavras-chave: Early-life stages; Fourier coefficients; Nursery ground; Otolith shape; Small-scale spatial structure.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00453/56476/58866.pdf
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The Great Melting Pot. Common Sole Population Connectivity Assessed by Otolith and Water Fingerprints 5
Morat, Fabien; Letourneur, Yves; Dierking, Jan; Pecheyran, Christophe; Bareille, Gilles; Blamart, Dominique; Harmelin-vivien, Mireille.
Quantifying the scale and importance of individual dispersion between populations and life stages is a key challenge in marine ecology. The common sole (Solea solea), an important commercial flatfish in the North Sea, Atlantic Ocean and the Mediterranean Sea, has a marine pelagic larval stage, a benthic juvenile stage in coastal nurseries (lagoons, estuaries or shallow marine areas) and a benthic adult stage in deeper marine waters on the continental shelf. To date, the ecological connectivity among these life stages has been little assessed in the Mediterranean. Here, such an assessment is provided for the first time for the Gulf of Lions, NW Mediterranean, based on a dataset on otolith microchemistry and stable isotopic composition as indicators of the...
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Ano: 2014 URL: https://archimer.ifremer.fr/doc/00284/39483/37973.pdf
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