Differences in performance among four indices used to evaluate diversity in planktonic ecosystems


Autoria(s): Beaugrand, G; Edwards, M
Data(s)

2001

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.

Formato

application/pdf

Identificador

http://plymsea.ac.uk/1322/1/Diversity_paper.pdf

Beaugrand, G; Edwards, M. 2001 Differences in performance among four indices used to evaluate diversity in planktonic ecosystems. Oceanologica Acta, 24 (4). 467-477. 10.1016/S0399-1784(01)01157-4 <http://doi.org/10.1016/S0399-1784(01)01157-4>

Idioma(s)

en

Relação

http://plymsea.ac.uk/1322/

http://www.sciencedirect.com

10.1016/S0399-1784(01)01157-4

Tipo

Publication - Article

PeerReviewed