DOI: 10.5061/dryad.qrfj6q5hk
title: Data from: Joint effects of environmental filtering and dispersal limitation on species assemblage of the Tibetan Plateau

description: Aim Mountains harbour a rich and non-random cluster of species, yet
 knowledge on the species’ biological attributes that support species
 coexistence in the montane community is limited. Here, we investigated the
 association of species occurrence on the Tibetan Plateau with species’
 morphological, ecological or evolutionary constraints. Location Tibetan
 Plateau (TP) Taxon Mammals and birds Methods We tested whether species
 occurrence on the TP correlates with morphological, ecological, or
 evolutionary constraints using the spatial distribution, phylogeny,
 dispersal ability, and thermal niche property data for 1,353 terrestrial
 vertebrates (383 mammals and 970 birds). We used standard
 (non-phylogenetic) and phylogenetic logistic regressions to disentangle
 the relative contributions of these attributes of species in explaining
 the species occurrence on the TP. We assessed the geographical patterns of
 community structures on the TP and fit linear mixed models to explore the
 underlying eco-evolutionary forces. Results The TP species exhibited a
 higher cold tolerance, wider thermal niche breadth, and higher rate of
 niche evolution than the non-TP species. We supported the assumption that
 the TP species was not a random subset from the species pool, but was
 structured jointly by environmental filtering and dispersal limitation.
 While dispersal and ecological processes underlying species assemblages
 varied spatially and among taxa, we found that species in stressful
 environments was limited by environmental filtering, whereas dispersal
 limitation was more pronounced under favourable climatic conditions. Main
 conclusions Our study finds that environmental filtering and dispersal
 limitation jointly shape the species assemblage on the TP. These findings
 provide significant insights into community assembly processes on the TP
 and other montane ecosystems on Earth, especially those that are sensitive
 to global warming.
description: <strong>Distribution
 data.</strong> Geographical ranges of the species were obtained from
 the expert range maps produced by the IUCN Red List database
 (http://www.iucnredlist.org) for mammals, and BirdLife International and
 NatureServe (http://www.birdlife.org) for birds. <strong>Dispersal ability.
 </strong>The dispersal ability of birds was described by the
 hand-wing index (HWI) obtained from Sheard et al. (2020). The dispersal
 ability of mammals was estimated by the home range size following the
 methods provided by Tucker et al. (2014). This method fitted linear models
 between empirical data of the body mass and home range size of mammals
 separately for carnivores, herbivores, and omnivores. And the home range
 sizes of the remaining mammals were interpolated using the fitted
 models. <strong>Species thermal
 niches.</strong> Thermal niche properties per species were measured
 using temperature variables across every 110 km × 110 km grid cell within
 a species range. Climate data was derived from the WorldClim data set
 (version 2.0; 2.5 arc min spatial resolution; Fick & Hijmans,
 2017). <strong>Diversification
 rate. </strong>The species-level diversification rate was calculated
 based on the equal-splits metric following Jetz et al. (2012). Dated
 phylogenies were from obtained Upham, Esselstyn, & Jetz (2019) for
 mammals and Jetz et al. (2012) for birds. <strong>Rate of thermal
 niche evolution.</strong> The rates of thermal niche evolution were
 calculated based on the phylogeny of species within each clade (i.e.,
 genus or family) using the thermal tolerance (i.e., minimum BIO1 values)
 per species. Ancestral values for each node were reconstructed using the
 phylogenetic generalized least-squares approach and the phylogenies were
 transformed based only on the Brownian motion model.
description: This zip package contains
 the data supporting the findings of the following paper: He et al. Joint
 effects of environmental filtering and dispersal limitation on species
 assemblage of the Tibetan Plateau