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	Provedor de dados ArchiMer (4) Autor Mante, Claude (4) Kide, Saikou Oumar (2) Merigot, Bastien (2) Barani, Aude (1) Beker, Beatriz (1) Claudet, Joachim (1) Demarcq, Herve (1) Denis, Michel (1) Dubroca, Laurent (1) Gregori, Gerald (1) Rebzani Zahaf, C (1) Xiao, Tian (1) Yao-lafourcade, Anne-francoise (1) Zhao, Li (1) Mais... Palavra-chave Algiers harbour (1) Bay of Marseille (1) Birth-and-dead models (1) Cell sorting (1) Flow cytometry (1) Habitat (1) Hellinger distance (1) Log-series (1) Macrobenthic communities (1) Minimum Hellinger distance (1) Multivariate analyses (1) Negative binomial (1) Pollution (1) Rare species (1) Selection (1) Species abundance (1) Trichomes (1) Ultraphytoplankton (1) Mais... Tipo do documento Text (4) Ano 2016 (1) 2015 (1) 2012 (1) 2003 (1) País France (4) Idioma Inglês (4)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 4 Primeira ... 1 ... Última Fairly processing rare and common species in multivariate analysis of ecological series - Application to macrobenthic communities from Algiers harbour ArchiMer Mante, Claude; Claudet, Joachim; Rebzani Zahaf, C. Systematic sampling of communities gives rise to large contingency tables summing up possible changes in the assemblages' structure. Such tables are generally analysed by multivariate statistical methods, which are ill-suited for simultaneously analysing rare and common species (Field et al., 1982). In order to separately process species belonging to either of these categories, we propose a statistical method to select common species in a sequence of ecological surveys. It is based on a precise definition of rarity, and depends on a rarity parameter. In this work, this parameter will be optimised so that the sub-table of common species captures the essential features of the complete table as well as possible. In this way we analysed the spatio-temporal... Tipo: Text Palavras-chave: Hellinger distance; Pollution; Algiers harbour; Multivariate analyses; Macrobenthic communities; Selection; Rare species. Ano: 2003 URL: https://archimer.ifremer.fr/doc/2003/publication-754.pdf Fitting the truncated negative binomial distribution to count data A comparison of estimators, with an application to groundfishes from the Mauritanian Exclusive Economic Zone ArchiMer Mante, Claude; Kide, Saikou Oumar; Yao-lafourcade, Anne-francoise; Merigot, Bastien. Modeling empirical distributions of repeated counts with parametric probability distributions is a frequent problem when studying species abundance. One must choose a family of distributions which is flexible enough to take into account very diverse patterns and possess parameters with clear biological/ecological interpretations. The negative binomial distribution fulfills these criteria and was selected for modeling counts of marine fish and invertebrates. This distribution depends on a vector of parameters, and ranges from the Poisson distribution (when ) to Fisher's log-series, when . Moreover, these parameters have biological/ecological interpretations which are detailed in the literature and in this study. We compared three estimators of K, and the... Tipo: Text Palavras-chave: Birth-and-dead models; Habitat; Log-series; Minimum Hellinger distance; Negative binomial; Species abundance. Ano: 2016 URL: https://archimer.ifremer.fr/doc/00352/46332/74377.pdf Possible bloom of free trichomes in the Bay of Marseille, NW Mediterranean Sea: an anomaly evidenced by flow cytometry ArchiMer Zhao, Li; Denis, Michel; Barani, Aude; Beker, Beatriz; Mante, Claude; Xiao, Tian; Gregori, Gerald. The composition of ultraphytoplankton (10 m) sampled in surface waters (1 m depth) was investigated during summer 2010 in the Bay of Marseille (NW Mediterranean) using flow cytometry. In addition to groups of Synechococcus, Prochlorococcus, picoeukaryotes and nanoeukaryotes, an unidentified additional cluster was observed. The particles forming this cluster had a high abundance (7 10(4) events mL(1)), with both orange and red fluorescence intensities like Synechococcus, but with a size signal larger than that of 2 m fluorospheres (beads). These unknown particles were sorted out by flow cytometry and then observed by epifluorescence microscopy: they appeared to be chain-forming microorganisms, just like trichomes of some diazotroph cyanobacteria with one... Tipo: Text Palavras-chave: Ultraphytoplankton; Trichomes; Bay of Marseille; Flow cytometry; Cell sorting. Ano: 2012 URL: https://archimer.ifremer.fr/doc/00372/48292/48454.pdf Spatio-Temporal Dynamics of Exploited Groundfish Species Assemblages Faced to Environmental and Fishing Forcings: Insights from the Mauritanian Exclusive Economic Zone ArchiMer Kide, Saikou Oumar; Mante, Claude; Dubroca, Laurent; Demarcq, Herve; Merigot, Bastien. Environmental changes and human activities can have strong impacts on biodiversity and ecosystem functioning. This study investigates how, from a quantitative point of view, simultaneously both environmental and anthropogenic factors affect species composition and abundance of exploited groundfish assemblages (i.e. target and non-target species) at large spatio-temporal scales. We aim to investigate (1) the spatial and annual stability of groundfish assemblages, (2) relationships between these assemblages and structuring factors in order to better explain the dynamic of the assemblages’ structure. The Mauritanian Exclusive Economic Zone (MEEZ) is of particular interest as it embeds a productive ecosystem due to upwelling, producing abundant and diverse... Tipo: Text Ano: 2015 URL: https://archimer.ifremer.fr/doc/00288/39945/38493.pdf Registros recuperados: 4 Primeira ... 1 ... Última

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