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Volume 90, Issue 12
Article

Associations between species and groups of sites: indices and statistical inference

Miquel De Cáceres

Corresponding Author

E-mail address: miquelcaceres@gmail.com

Département de Sciences Biologiques, Université de Montréal, C.P. 6128, succursale Centre-ville, Montréal, Québec H3C 3J7 Canada

E-mail: E-mail address: miquelcaceres@gmail.comSearch for more papers by this author
Pierre Legendre

Département de Sciences Biologiques, Université de Montréal, C.P. 6128, succursale Centre-ville, Montréal, Québec H3C 3J7 Canada

Search for more papers by this author
First published: 01 December 2009
Citations: 928

Abstract

Ecologists often face the task of studying the association between single species and one or several groups of sites representing habitat types, community types, or other categories. Besides characterizing the ecological preference of the species, the strength of the association usually presents a lot of interest for conservation biology, landscape mapping and management, and natural reserve design, among other applications. The indices most frequently employed to assess these relationships are the phi coefficient of association and the indicator value index (IndVal). We compare these two approaches by putting them into a broader framework of related measures, which includes several new indices. We present permutation tests to assess the statistical significance of species–site group associations and bootstrap methods for obtaining confidence intervals. Correlation measures, such as the phi coefficient, are more context‐dependent than indicator values but allow focusing on the preference of the species. In contrast, the two components of an indicator value index directly assess the value of the species as a bioindicator because they can be interpreted as its positive predictive value and sensitivity. Ecologists should select the most appropriate index of association strength according to their objective and then compute confidence intervals to determine the precision of the estimate.

Number of times cited according to CrossRef: 928

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