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If deterministic forces drive community assembly, locally co-occurring species will comprise a nonrandom sample of surrounding species pools. In addition, species traits should determine the degree to which they thrive in local environments. Specific types of nonrandom trait structure may suggest particular community assembly mechanisms such as environmental filtering and niche differentiation. Here we test alpine grass communities for functional overdispersion, regularity in trait differences, and the presence of species clusters in trait space. Our field sites follow a temperature gradient, which allows us to test for strength of trait pattern against local temperature. We find that ...  \end{abstract}  \section*{Introduction}  \section*{Methods}  \subsection*{Data}