Multivariate measure of niche overlap using canonical correspondence analysis

Abstract

A measure of multidimensional niche overlap based on species scores from canonical correspondence analysis is presented. This measure, N, is the amount of overlap using species scores as approximate weighted averages with respect to multidimensional niche breadth for the community given by N = O - [(ui - uj)' V(inverse) (ui - uj) g |V|]. Multidimensional niche overlap was calculated for a representative periphytic community from northern Lake Huron. Classification of species interaction or species similarities was accomplished using cluster analysis of the multidimensional niche overlap values. Two major groups of taxa showing similarities were eveident based on niche influence. This influence produced a gradation of species found in clean waters to those found in varying degrees of pollution.