Spatial phylogenetics reveals evolutionary constraints on the assembly of a large regional flora

作者：Daniel Spalink, Ricardo Kriebel, Pan Li, Matthew C. Pace, Bryan T. Drew, John G. Zaborsky, Jeffrey P. Rose, Chloe P. Drummond, Mary Ann Feist, William S. Alverson, Donald M. Waller, Kenneth M. Cameron, Thomas J. Givnish, Kenneth J. Sytsma · 发表于：American Journal of Botany · 年份：2018 · DOI：10.1002/ajb2.1191 · 被引用次数：33 · 研究领域：Plant Diversity and Evolution、Ecology and Vegetation Dynamics Studies、Species Distribution and Climate Change

PREMISE OF THE STUDY: We used spatial phylogenetics to analyze the assembly of the Wisconsin flora, linking processes of dispersal and niche evolution to spatial patterns of floristic and phylogenetic diversity and testing whether phylogenetic niche conservatism can account for these patterns. METHODS: We used digitized records and a new molecular phylogeny for 93% of vascular plants in Wisconsin to estimate spatial variation in species richness and phylogenetic α and β diversity in a native flora shaped mainly by postglacial dispersal and response to environmental gradients. We developed distribution models for all species and used these to infer fine-scale variation in potential diversity, phylogenetic distance, and interspecific range overlaps. We identified 11 bioregions based on floristic composition, mapped areas of neo- and paleo-endemism to establish new conservation priorities and predict how community-assembly patterns should shift with climatic change. KEY RESULTS: Spatial phylogenetic turnover most strongly reflects differences in temperature and spatial distance. For all vascular plants, assemblages shift from phylogenetically clustered to overdispersed northward, contrary to most other studies. This pattern is lost for angiosperms alone, illustrating the importance of phylogenetic scale. CONCLUSIONS: Species ranges and assemblage composition appear driven primarily by phylogenetic niche conservatism. Closely related species are ecologically similar and occupy si...