Takes a niche utilization matrix returns the skewness of the
Pianka pairwise niche overlap index.
Usage
pianka_skew(m = matrix(rpois(80, 1), nrow = 10))
Arguments
m
a matrix of resource utilization values.
Value
Returns the skewness of the average pairwise niche overlap.
Details
A large positive value for skewness implies that there are more species pairs
with high than low niche overlap. A large negative value for skewness implies there are more
species pairs with low than high niche overlap. The performance of this algorithm
has not been thoroughly tested with real data sets.
References
Winemiller, K.O. and E.R. Pianka. 1990. Organization in natural assemblages
of desert lizards and tropical fishes. Ecological Monographs 60: 27-55.