Species Interactions Mediate Phylogenetic Community Structure in a Hyperdiverse Lizard Assemblage from Arid Australia
Species Interactions Mediate Phylogenetic Community Structure in a Hyperdiverse Lizard Assemblage from Arid Australia
复制标题
物种相互作用介导来自干旱澳大利亚的超多样化蜥蜴组合的系统发育群落结构
作者：
D. Rabosky;M. Cowan;A. Talaba;I. Lovette
进化史可以对生态群落产生深远的影响，但关于系统发育、群落成员和生态位进化之间的关系却很少出现共性。我们比较了来自干旱澳大利亚的三个蜥蜴支系(Ctenotus skinks，Aagamides和Dplodactyline Geckos)的系统发育群落结构和生态位进化。我们调查了大维多利亚沙漠西北部32个地点的蜥蜴群落，并为三个支系的区域代表绘制了完整的物种水平的分子系统发育图。我们记录了所有种群在当地群落内的系统发育均匀度的显著模式：不同地点物种丰度的成对相关性与系统发育相似性呈负相关。通过基于物种栖息地偏好的地点适宜性建模，我们表明，即使控制了物种之间的栖息地过滤，系统发育的均衡性通常也是持续的。这种系统发育的均衡性与栖息地相关特征的进化不稳定性相结合，以至于近亲物种在栖息地利用上比远亲物种更具差异性。相反，蜥蜴的食物在系统发育上是保守的，物种之间的成对食物重叠与三个分支中的两个分支的系统发育距离呈负相关。我们的结果表明，当代和历史上的物种互动导致了世界上最多样化的蜥蜴群落之一的多个分支的群落结构模式相似。
Evolutionary history can exert a profound influence on ecological communities, but few generalities have emerged concerning the relationships among phylogeny, community membership, and niche evolution. We compared phylogenetic community structure and niche evolution in three lizard clades (Ctenotus skinks, agamids, and diplodactyline geckos) from arid Australia. We surveyed lizard communities at 32 sites in the northwestern Great Victoria Desert and generated complete species-level molecular phylogenies for regional representatives of the three clades. We document a striking pattern of phylogenetic evenness within local communities for all groups: pairwise correlations in species abundance across sites are negatively related to phylogenetic similarity. By modeling site suitability on the basis of species’ habitat preferences, we demonstrate that phylogenetic evenness generally persists even after controlling for habitat filtering among species. This phylogenetic evenness is coupled with evolutionary lability of habitat-associated traits, to the extent that closely related species are more divergent in habitat use than distantly related species. In contrast, lizard diets are phylogenetically conserved, and pairwise dietary overlap between species is negatively related to phylogenetic distance in two of the three clades. Our results suggest that contemporary and historical species interactions have led to similar patterns of community structure across multiple clades in one of the world’s most diverse lizard communities.