Biogeography of the cosmopolitan sedges (Cyperaceae) and the area‐richness correlation in plants

作者：Daniel Spalink, Bryan T. Drew, Matthew C. Pace, John G. Zaborsky, Julian R. Starr, Kenneth M. Cameron, Thomas J. Givnish, Kenneth J. Sytsma · 发表于：Journal of Biogeography · 年份：2016 · DOI：10.1111/jbi.12802 · 被引用次数：86 · 研究领域：Botany, Ecology, and Taxonomy Studies、Ecology and Vegetation Dynamics Studies、Plant Taxonomy and Phylogenetics

Abstract Aim Across angiosperm families, the area occupied by a family is strongly correlated with its richness. We explore the causes of this area‐richness correlation using the cosmopolitan family, Cyperaceae Juss., as a model. We test the hypothesis that, despite a proposed tropical origin, temperate lineages in the family diversified at elevated rates. We test the hypothesis that the area‐richness correlation is maintained within intrafamilial clades, and that this relationship could be described as a function of niche space. We also test the hypothesis that the partitioning of geographical and ecological space, not the extent of this space, is the factor most closely associated with clade richness. Location Cosmopolitan. Methods We use molecular data from four genes sequenced in 384 taxa to develop a chronogram of Cyperaceae. We then develop a model of ancestral ranges and measure rates of diversification throughout the history of the family. Integrating data from over 4,800,000 digitized herbarium records, we characterize the range and niche of more than 4500 species and test for correlations of the species richness maintained within clades with range size, range partitioning, range overlap, niche, clade age and rate of diversification. Results Cyperaceae originated in South America in the late Cretaceous and subsequently dispersed throughout the globe. Of three increases in diversification rate, two occurred in the temperate Northern Hemisphere. The variable most close...