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Registros recuperados: 5
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A phytosociological method for interpreting plankton data ArchiMer
Fromentin, Jean-marc; Ibanez, F.; Legendre, P..
Multivariate techniques allow data sets to be summarised, but are not deslgned to causally model ecological phenomena. The ambiguity of the interpretation results from the ambiguity of the scaling space. The phytosociological method proposed by Grandjouan (1982; These d'etat, Universite Louis Pasteur, Strasbourg) is a general interpretive framework allowing separate consideration of 3 distinct reference spaces. a geographical space to visualise the spatio-temporal distribution of the descriptors, an ecological space showing the effects of the environmental variables on the biological descriptors, and a bio-ethological space showing the statistically meaningful species cornmunities. It is thus possible to define the position of each biological category and...
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Ano: 1993 URL: http://archimer.ifremer.fr/doc/00033/14454/11756.pdf
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Biogeographic relationships among deep-sea hydrothermal vent faunas at global scale ArchiMer
Bachraty, Charleyne; Legendre, P.; Desbruyeres, Daniel.
The discovery of deep-sea hydrothermal vent fauna, kilometres deep in the oceans, is a great achievement of 20th-century marine biology. The deep-sea hydrothermal food web does not directly depend on the sun's energy. Vent communities rely primarily on trophic associations between chemoautotrophic bacteria and consumers A small. number of endemic taxa are adapted to the inhospitable vent environments that are distributed along ridge crests. Where these vent communities originated and how they dispersed are among the important questions ecologists must answer. Here, by statistical analysis of the most comprehensive database ever assembled about deep-sea hydrothermal fauna, we delineate six major hydrothermal provinces in the world ocean and identify seven...
Tipo: Text Palavras-chave: Multivariate regression tree; Minimum spanning tree; Deep sea hydrothermal vent communities; Coefficients of dispersal direction; Centre of dispersal; Biogeographic provinces.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6936.pdf
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Faunal changes and geographic crypticism indicate the occurrence of a biogeographic transition zone along the southern East Pacific Rise ArchiMer
Matabos, M.; Plouviez, S.; Hourdez, S.; Desbruyeres, Daniel; Legendre, P.; Waren, A.; Jollivet, D.; Thiebaut, E..
Aim Deep-sea hydrothermal vents have now been reported along all active mid-ocean ridges and back-arc basins, but the boundaries of biogeographic entities remain questionable owing to methodological issues. Here we examine biogeographic patterns of the vent fauna along the East Pacific Rise (EPR) and determine the relative roles of regional and local factors on the distribution of biodiversity associated with mussel beds along a poorly explored zone, the southern EPR (SEPR). Location East Pacific Rise. Methods A species list of macrobenthic invertebrates along the EPR was compiled from the literature and supplemented with data recovered during the French research cruise BIOSPEEDO carried out in 2004 along the SEPR. Biogeographic patterns were assessed by...
Tipo: Text Palavras-chave: Biogeographic patterns; Community structure; East Pacific Rise; Hydrothermal vents; Marine biodiversity; Molecular systematics; Mussel beds; Species richness.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00033/14395/11767.pdf
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High-resolution dynamics of a deep-sea Hydrothermal mussel assemblage monitored by the EMSO-Açores MoMAR observatory ArchiMer
Sarrazin, Jozee; Cuvelier, Daphne; Peton, Loic; Legendre, P.; Sarradin, Pierre-marie.
Although the spatial distribution of hydrothermal vent assemblages in relation to environmental conditions has been assessed in several studies, there is little documented data on the temporal variation of the fauna and corresponding abiotic factors in a vent community. Here, we present one of the longest integrated (faunal and environmental data) time series ever obtained in a hydrothermal ecosystem. The data were acquired using the TEMPO ecological module that was deployed between 2006 and 2008 on the Mid-Atlantic Ridge, providing the first insights into the day-to-day variations in a Bathymodiolus azoricus mussel assemblage from the Lucky Strike vent field for the 48 days during which the video camera operated. The time-series yielded additional...
Tipo: Text Palavras-chave: Hydrothermal vents; Faunal dynamics; Mid-Atlantic Ridge; Deep-sea observatory; Bathymodiolus azoricus mussel assemblages; Sulphide edifices; Environmental conditions.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00189/30023/28508.pdf
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Strategy of Eel (Anguilla anguilla L.) : exploitation in the Thau lagoon IRD
Bach, Pascal; Legendre, P.; Amanieu, M.; Lasserre, G..
L'anguille (#Anguilla anguilla L.$) est l'espèce cible de la pêche artisanale de l'étang de Thau. Son exploitation met en jeu plusieurs engins de pêche : capéchades, triangle, brandine qui exercent une sélectivité différente sur les tailles des prises. Les données hebdomadaires de commercialisation ont été collectées durant 28 mois. L'analyse des séries temporelles des débarquements et de l'effort de pêche par la méthode du périodogramme de contingence met en évidence deux périodes significatives à 6 et 12 mois. Les hypothèses sur l'influence de facteurs explicatifs des comportements de la ressource et des pêcheurs sont testés à partir d'une analyse des coefficients de direction. Les résultats des modèles diffèrent selon les engins de pêche étudiés mais...
Tipo: Text Palavras-chave: POISSON; MILIEU SAUMATRE; PECHE ARTISANALE; SELECTIVITE D'ENGINS; EFFORT DE PECHE; ANALYSE MULTIVARIABLE; ETANG; ANGUILLE; SERIE CHRONOLOGIQUE; REGRESSION MULTIPLE.
Ano: 1992 URL: http://www.documentation.ird.fr/hor/fdi:37882
Registros recuperados: 5
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