Measuring phylogenetic and trait-based structure
In this work, the standardized mean phylogenetic distance (SES.MPD) and
its functional analogy, the standardized pairwise trait distance
(SES.PW) were applied to quantify phylogenetic and trait-based community
structure (Swenson 2014). Using simulation procedure under a null model
(independent swap) (Gotelli & Entsminger 2001), SES.MPD and SES.PW were
calculated with the following equation:
SES = (Meanobs-
Meannull)/sdnull
where, Meanobs is the observed MPD or PW within
community, Meannull is the mean value of MPDs or PWs of
999 randomly generated communities, sdnull is the
standard deviations of MPDs or PWs of 999 randomized communities. As
species data was binary in each community in two datasets, calculation
for phylogenetic and trait-based structure were accomplished without
abundance weighted (abundance weighted = false).