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Differences in performance among four indices used to evaluate diversity in planktonic ecosystems ArchiMer
Beaugrand, G; Edwards, M.
The performance of four common estimators of diversity are investigated using calanoid copepod data from the Continuous Plankton Recorder (CPR) survey. The region of the North Atlantic and the North Sea was divided into squares of 400 nautical miles for each 2-month period. For each 144 possible cases, Pielou's pooled quadrat method was performed with the aims of determining asymptotic diversity and investigating the CPR sample-size dependence of diversity estimators. It is shown that the performance of diversity indices may greatly vary in space and time (at a seasonal scale). This dependence is more pronounced in higher diverse environments and when the sample size is small. Despite results showing that all estimators underestimate the 'actual'...
Tipo: Text Palavras-chave: Programme continuous plankton recorder; Copépodes; Indices de diversité; Taille de l’échantillonnage; Sensibilité; Continuous Plankton Recorder survey; Copepods; Diversity indices; Sample size; Sensitivity.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00322/43343/42884.pdf
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Ecologie de la faune associée aux émissions de fluides froids de Méditerranée orientale profonde ArchiMer
Ritt, Benedicte.
The major objectives of this thesis were to study the structure, functioning and dynamics of different faunal assemblages associated with cold seep ecosystems in the eastern Mediterranean Sea. We focused our study on three main sites: the Marmara Sea, the Mediterranean ridge and the Nile deep sea fan. This thesis aims at determining the environmental signature of Mediterranean sites and the characteristics of the associated fauna at European and global scales. The specific objectives were to (1) determine the composition, diversity, density, biomass of invertebrate assemblages, (2) characterize biogeochemical conditions within different microhabitats in the vicinity of organisms, (3) to define the trophic relationships amongst seep fauna using stable...
Tipo: Text Palavras-chave: Emissions de fluides froids; Volcans de boue; Pockmarks; Méditerranée orientale; Faune benthique; Conditions environnementales; Indices de diversité; Cold seeps; Eastern Mediterranean; Mud volcanoes; Pockmarks; Benthic fauna; Environmental conditions; Diversity indices.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00020/13138/10178.pdf
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