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Registros recuperados: 9
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Diet is correlated with otolith shape in marine fish ArchiMer
Mille, Tiphaine; Mahe, Kelig; Cachera, Marie; Villanueva, Ching-maria; De Pontual, Helene; Ernande, Bruno.
Previous studies have shown that food amount influence fish otolith structure, opacity and shape and that diet composition has an effect on otolith chemical composition. This study investigated the potential correlation between diet and otolith shape in 5 wild marine fish species by addressing 4 complementary questions. First, is there a global relationship between diet and otolith shape? Second, which prey categories are involved in this relationship? Third, what are the respective contributions of food quantity and relative composition to diet–otolith shape co-variation? Fourth, is diet energetic composition related to otolith shape? For each species, we investigated how otolith shape varies with diet. These questions were tackled by describing diet in...
Tipo: Text Palavras-chave: Fourier analysis; English Channel; Interspecific; Morphometric analysis; Otolith growth; Saccular otolith; Stomach contents.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00345/45639/45269.pdf
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Etude de la contamination chimique chez quatre espèces de poisson en Méditerranée. Rapport final des actions 2017-2018 du dispositif de suivi CONTAMED ArchiMer
Mille, Tiphaine; Mauffret, Aourell; Baudrier, Jerome; Wessel, Nathalie; Bouchoucha, Marc.
Le dispositif de suivi CONTAMED vise à suivre les niveaux de contamination de plusieurs maillons de réseaux trophiques méditerranéens et à approfondir la compréhension des processus de bioaccumulation et de transfert des contaminants métalliques et organiques. CONTAMED se décompose en 3 protocoles ; les actions 2017-2018 correspondent à la réalisation des protocoles 1 et 3. Le protocole 1 est le suivi de la contamination en mercure dans le muscle des 2 espèces communes de rougets le long de la façade méditerranéenne française avec pour objectif supplémentaire cette année de mieux appréhender les variations saisonnières de la contamination en mercure dans le but de définir la période d’échantillonnage optimale et donc de stabiliser le protocole du réseau de...
Tipo: Text Palavras-chave: Contaminants chimiques Réseaux trophiques; Méditerranée Surveillance DCSMM.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00458/56962/58860.pdf
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Otolith shape as a valuable tool to evaluate the stock structure of swordfish (Xiphias gladius) in the Indian Ocean ArchiMer
Mahe, Kelig; Evano, Hugues; Mille, Tiphaine; Bourjea, Jerome.
Swordfish (Xiphias gladius) is an oceanic-pelagic species currently fully exploited by several fisheries in the Indian Ocean, with suspicion of overexploitation in the southwest, but without a clear understanding of the real stock structure within this Ocean. Population structure of the Indian stock was studied in the western Indian Ocean using 395 individual samples collected from 2009 to 2014. Sagittal otoliths of the fish have been removed and shape analysis performed on these calcified pieces. Otolith morphometrics data and normalized Elliptical Fourier Descriptors (EFDs) were then extracted automatically by the dedicated imageanalysis system TNPC. Preliminary, side effect was tested by Redundancy analysis (RDA) combined to permutation tests on 91...
Tipo: Text Palavras-chave: Xiphias gladius; Otolith shape; Fourier descriptors; Stock discrimination; Indian Ocean.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00269/37980/36068.pdf
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Otolith shape as a valuable tool to evaluate the stock structure of swordfish Xiphias gladius in the Indian Ocean ArchiMer
Mahe, Kelig; Evano, Hugues; Mille, Tiphaine; Muths, D.; Bourjea, Jerome.
Swordfish Xiphias gladius is an oceanic-pelagic species. Its population structure in the Western Indian Ocean was studied from the shape of the sagittal otoliths of 391 individuals collected from 2009 to 2014. Normalised elliptical Fourier descriptors (EFDs) were extracted automatically using TNPC software. Principal components analysis (PCA) conducted on EFDs showed no significant effect of side (i.e. left or right otolith). Consequently, all 391 sagittal otoliths were used to identify stocks among six geographical areas: Reunion Island, Mozambique Channel, Rodrigues, South Africa, Madagascar South and Sri Lanka. To investigate the effects of sex, sampling year, sampling season, lower jaw fork length or geographical area on variations in otolith shape,...
Tipo: Text Palavras-chave: Connectivity; Fourier descriptors; Morphometric markers; Sagittal otoliths; Stock discrimination.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00354/46527/46411.pdf
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Otolith shape as a valuable tool to evaluate the stock structure of swordfish (Xiphias gladius) in the Indian Ocean ArchiMer
Mahe, Kelig; Evano, Hugues; Mille, Tiphaine; Bourjea, Jerome.
Swordfish (Xiphias gladius) is an oceanic-pelagic species currently fully exploited by several fisheries in the Indian Ocean, with suspicion of overexploitation in the southwest, but without a clear understanding of the real stock structure within this Ocean. Population structure of the Indian stock was studied in the western Indian Ocean using 395 individual samples collected from 2009 to 2014. Sagittal otoliths of the fish have been removed and shape analysis performed on these calcified pieces. Otolith morphometrics data and normalized Elliptical Fourier Descriptors (EFDs) were then extracted automatically by the dedicated image-analysis system TNPC. Preliminary, side effect was tested by Redundancy analysis (RDA) combined to permutation tests on 91...
Tipo: Text
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00220/33150/31633.pdf
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OTOLITHE –ESPADON : Evaluation de la structure du stock d’espadon de l’océan indien à partir des analyses de forme des otolithes ArchiMer
Bourjea, Jerome; Mille, Tiphaine; Evano, Hugues; Mahe, Kelig.
L’espadon (Xiphias gladius) de l’océan Indien est actuellement une ressource évaluée comme étant pleinement exploitée à l’échelle de cet océan, avec un risque de surexploitation dans le sud-ouest de l’océan Indien. Une précédente étude a permis de démontrer que les espadons de l’océan Indien ne formaient qu’une seule et même population génétique (conclusion du projet IOSSS – ESPADON). L’objectif de ce projet a été d’explorer la forme de 395 otolithes d’espadons collectés dans sept zones différentes de l’océan Indien pour identifier s’ils provenaient de stocks différents ou non. Cette étude a permis de tirer 5 conclusions principales : les otolithes gauche et droit de l’espadon sont significativement similaires. 1- il n’y a pas d’effet de la taille des...
Tipo: Text Palavras-chave: Espadon; Xiphias gladius; Otolithe; Descripteur de Fourier; Stock; Océan Indien; Forme.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00272/38324/36565.pdf
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Sources de variation intra-populationelle de la morphologie des otolithes: asymétrie directionnelle et régime alimentaire ArchiMer
Mille, Tiphaine.
Otoliths are calcified structures located in Osteichthyes’ inner ear that are involved in audition and balance. Their morphology is used as an indicator of various ecological processes or properties. This application requires identifying the endogenous and exogenous factors that act simultaneously as sources of shape variation. This thesis aims at detecting and quantifying the relative contributions of directional asymmetry and diet to otolith shape variation at the intra-population level. Directional asymmetry between left and right otoliths was found in flat-fishes, the blind-side otolith being always longer and larger, whereas it was negligible in round-fishes. However, asymmetry amplitude never exceeded 18 %, which suggests evolutionary canalization of...
Tipo: Text Palavras-chave: Otolithes; Oreille interne; Ostéichtyens; Symétrie; Alimentation; Analyse de forme; Analyse de Fourier; Morphométrie géométrique; Otoliths; Inner ear; Osteichthyes; Symmetry; Diet composition; Shape analysis; Fourier analysis; Geometric morphometrics.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00344/45536/45108.pdf
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Sources of otolith morphology variation at the intra-population level: directional asymmetry and diet. ArchiMer
Mille, Tiphaine; Ernande, Bruno; De Pontual, Helene; Villanueva, Ching-maria; Mahe, Kelig.
Tipo: Text
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00339/45052/44455.pdf
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Trace metal concentrations in the muscle of seven marine species: Comparison between the Gulf of Lions (North-West Mediterranean Sea) and the Bay of Biscay (North-East Atlantic Ocean) ArchiMer
Mille, Tiphaine; Cresson, Pierre; Chouvelon, Tiphaine; Bustamante, Paco; Brach-papa, Christophe; Bruzac, Sandrine; Rozuel, Emmanuelle; Bouchoucha, Marc.
Concentrations of 6 trace metals (Ag, Cd, Cu, Ni, Pb, Zn) in the muscle of 2 sharks (Galeus melastomus and Scyliorhinus canicula), 4 teleosts (Helicolenus dactylopterus, Lepidorhombus boscii, Micromesistius poutassou and Phycis blennoides) and 1 crustacean (Nephrops norvegicus) were compared between the Bay of Biscay (Atlantic Ocean) and the Gulf of Lions (Mediterranean Sea). Although average concentrations and the trace element pollution index were generally higher in the Gulf of Lions, significant differences between the two ecosystems were only found for Zn for Helicolenus dactylopterus, and for Ag and Cu for the crustacean N. norvegicus. Moreover, some relationships between trophic level or size and metal concentrations were found for these two...
Tipo: Text Palavras-chave: Inorganic elements; Contamination; Bioaccumulation; Fish; Shark; Norway lobster.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00448/55958/57497.pdf
Registros recuperados: 9
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