Compute niche width of the species in a community.
A community data matrix with each column for each species, and each row for each plot.
Index of niche width.
To be added
A vetor contains niche width index of species in community.
Jinlong Zhang firstname.lastname@example.org
Zhang Jin-tun,(2004 ) Quantitative Ecology, Science Press, Beijing
niche.overlap for niche overlap
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