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Summary Analytical methods are now available that can date all nodes in a molecular phylogenetic tree with one calibration, and which correct for variable rates of DNA substitution in different lineages. Although these techniques are approximate, they offer a new tool to investigate the historical construction of species‐rich biomes. Dated phylogenies of globally distributed plant families often indicate that dispersal, even across oceans, rather than plate tectonics, has generated their wide distributions. By contrast, there are indications that animal lineages have undergone less long distance dispersal. Dating the origin of biome‐specific plant groups offers a means of estimating the age of the biomes they characterize. However, rather than a simple emphasis on biome age, we stress the importance of studies that seek to unravel the processes that have led to the accumulation of large numbers of species in some biomes. The synthesis of biological inventory, systematics and evolutionary biology offered by the frameworks of neutral ecological theory and phylogenetic community structure offers a promising route for future work. Contents Summary 605 I. Introduction 606 II. Methodological issues 606 III. Insights into processes that give rise to species rich biomes 608 IV. Future directions: neutral ecological theory, community phylogenetic structure, and processes leading to species accumulation 612 V. Conclusions 613 Acknowledgements 614 References 614
Pennington et al. (Wed,) studied this question.