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	Provedor de dados ArchiMer (4) Neotropical Ichthyology (1) Autor De Troch, Marleen (2) Lepoint, Gilles (2) Michel, Loic (2) Remy, François (2) Darnaude, Audrey M. (1) Kelly,Sean P. (1) Kopp, Dorothee (1) Mascart, Thibaud (1) Mascart, Thibaut (1) Niklitschek, Edwin J. (1) Pascual,Miguel (1) Pawlowski, Lionel (1) Robert, Marianne (1) Tagliaferro,Marina (1) Mais... Palavra-chave Mixing models (5) Mediterranean Sea (2) Stable isotopes (2) Competition (1) Detrital pathway (1) Diet (1) Fatty acids (1) Feeding habits (1) Fish stocks (1) Food web (1) Food webs (1) Invertebrates (1) Isotopic niche (1) Macrophytodetritus (1) Meiofauna (1) Mixed stocks (1) Mixing proportions (1) Mixture models (1) Otolith chemistry (1) Population structure (1) Mais... Tipo do documento Text (4) Info:eu-repo/semantics/article (1) Ano 2020 (1) 2018 (3) 2016 (1) País France (4) Brazil (1) Idioma Inglês (5)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 5 Primeira ... 1 ... Última Performance of maximum likelihood mixture models to estimate nursery habitat contributions to fish stocks: a case study on sea bream Sparus aurata ArchiMer Niklitschek, Edwin J.; Darnaude, Audrey M.. Background: Mixture models (MM) can be used to describe mixed stocks considering three sets of parameters: the total number of contributing sources, their chemical baseline signatures and their mixing proportions. When all nursery sources have been previously identified and sampled for juvenile fish to produce baseline nursery-signatures, mixing proportions are the only unknown set of parameters to be estimated from the mixed-stock data. Otherwise, the number of sources, as well as some/all nursery-signatures may need to be also estimated from the mixed-stock data. Our goal was to assess bias and uncertainty in these MM parameters when estimated using unconditional maximum likelihood approaches (ML-MM), under several incomplete sampling and... Tipo: Text Palavras-chave: Otolith chemistry; Mixture models; Mixed stocks; Mixing proportions; Mixing models; Stock identification; Stock structure; Fish stocks; Population structure; Sparus aurata. Ano: 2016 URL: https://archimer.ifremer.fr/doc/00625/73753/74388.pdf Seagrass organic matter transfer in Posidonia oceanica macrophytodetritus accumulations ArchiMer Remy, François; Mascart, Thibaut; De Troch, Marleen; Michel, Loic; Lepoint, Gilles. Seagrass ecosystems are net autotrophic systems which contribute to organic carbon burial in marine sediment. Dead seagrass leaves are often exported outside the seagrass beds and may form accumulations (exported macrophytodetritus accumulations, hereafter EMAs) from littoral zones to deepest canyons. Understanding how seagrass organic matter is channeled in its associated trophic web is necessary to assess the role of the seagrass ecosystem as blue carbon service providers. We used gut content and stable isotope analyses to delineate the Posidonia oceanica EMA food web structure and to determine the importance of detrital material in the diets of macrofauna. Evidence from gut contents and stable isotopes showed that this food web is fuelled mainly by two... Tipo: Text Palavras-chave: Stable isotopes; Detrital pathway; Mixing models; Trophic level; Invertebrates; Mediterranean Sea; Food web. Ano: 2018 URL: https://archimer.ifremer.fr/doc/00448/55969/57464.pdf Seasonal dependence on seagrass detritus and trophic niche partitioning in four copepod eco-morphotypes ArchiMer Mascart, Thibaud; De Troch, Marleen; Remy, François; Michel, Loic; Lepoint, Gilles. Benthic copepods dominate meiofaunal communities from marine phytodetritus, both in terms of numerical abundance and species diversity. Nevertheless, ecological factors driving copepod co-existence and population dynamics are still largely unknown. Here, we aimed to explore feeding habits of four copepod species commonly found in Mediterranean seagrass detritus accumulations, representing distinct eco-morphotypes (planktonic, phytal, epibenthic and mesopsammic). Joint use of fatty acid and stable isotope trophic markers showed that co-occurring harpacticoid copepods have diversified diets. Contrary to what was expected, microphytobenthos does not serve as their main food source. Instead, we found evidence from both techniques that major food items include... Tipo: Text Palavras-chave: Macrophytodetritus; Posidonia oceanica; Meiofauna; Stable isotopes; Fatty acids; Isotopic niche; Mixing models; Mediterranean Sea. Ano: 2018 URL: https://archimer.ifremer.fr/doc/00440/55187/60472.pdf Characterization of food web structure of the upper continental slope of the Celtic Sea highlighting the trophic ecology of five deep-sea fishes ArchiMer Kopp, Dorothee; Robert, Marianne; Pawlowski, Lionel. In marine ecosystems, the study of trophic relationships has extensively benefited from the development of stable isotope analyses (SIA) as dietary tracers. SIA are particularly useful in elucidating the structure of deep sea food webs given the constraints involved in obtaining gut-content data from deep trawling. We used carbon and nitrogen stable isotope analyses and Stable Isotope Bayesian Ellipses in R (SIBER) and Stable Isotope Analysis in R (SIAR) routines, to determine the trophic ecology of five deep-sea fishes from the upper continental slope of the Celtic Sea. SIA made it possible to deduce some general tendencies in food-web structure and species trophic interactions and confirmed diet determined by gut-content analysis for the same species, in... Tipo: Text Palavras-chave: Competition; Feeding habits; Mixing models; Stable isotope. Ano: 2018 URL: https://archimer.ifremer.fr/doc/00410/52138/52940.pdf First study of food webs in a large glacial river: the trophic role of invasive trout Neotropical Ichthyology Tagliaferro,Marina; Kelly,Sean P.; Pascual,Miguel. Abstract The aim of this study was to determine the food webs structure of a large Patagonian river in two river sections (Upstream and Midstream) and to evaluate isotopic overlap between native and introduced species. We used stable isotope analyses of δ15N and δ13C and stomach content. The Upstream section had a more complex food webs structure with a greater richness of macroinvertebrates and fish species than Midstream. Upstream basal resources were dominated by filamentous algae. Lake Trout were found to have a higher trophic position than all other fish species in that area although, the most abundant fish species, were Rainbow Trout. Depending on the life stage, Rainbow Trout shifted from prey to competitor/predator. In the Midstream section, the... Tipo: Info:eu-repo/semantics/article Palavras-chave: Diet; Food webs; Mixing models; Salmonids; Stable isotopes analysis. Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000300210 Registros recuperados: 5 Primeira ... 1 ... Última

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