Data/hora: 09/06/2024 16:31:41

Provedor de dados: 	5	
País: 	France	
Título: 	Differences in performance among four indices used to evaluate diversity in planktonic ecosystems	
Autores: 	Beaugrand, G; Edwards, M.	
Data: 	2001-09	
Ano: 	2001	
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.	
Resumo: 	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' diversity, comparison of sites remained reliable from a few pooled CPR samples. Using more than one CPR sample, the Gini coefficient appears to be a better diversity estimator than any other indices and spatial or temporal comparisons are highly satisfactory. In situations where comparative studies are needed but only one CPR sample is available, taxonomic richness was the preferred method of estimating diversity. Recommendations are proposed to maximise the efficiency of diversity estimations with the CPR data.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/00322/43343/42884.pdf

DOI:10.1016/S0399-1784(01)01157-4

http://archimer.ifremer.fr/doc/00322/43343/	
Editor: 	Gauthier-villars/editions Elsevier	
Formato: 	application/pdf	
Fonte: 	Oceanologica Acta (0399-1784) (Gauthier-villars/editions Elsevier), 2001-09 , Vol. 24 , N. 5 , P. 467-477	
Fonte: 	2001 Ifremer/CNRS/IRD/Éditions scientifiques et médicales Elsevier SAS

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