var_diff

a vector of non-negative trait measures, one for each species


Function to calculate the variance in size differences
between adjacent, ordered species. If there is a tendency towards a
constant absolute size difference between adjacent species, this
variance will be relatively small. Alternatively, if some adjacent species
are close in size, but others are very distant, this variance will be
large. Small variances might be indicative of assemblages in which
there is a competitively-based limit to similarity.


Given a site by species interaction matrix, users can make inferences about species interactions by performance hypothesis comparing test statistics against a null distribution. The current package provides algorithms and metrics for niche-overlap, body size ratios and species co-occurrence. Users can also integrate their own algorithms and metrics within these frameworks or completely novel null models. Detailed explanations about the underlying assumptions of null model analysis in ecology can be found at http://ecosimr.org.

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var_diff: VarDiff Size Overlap Ratio Metric

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