Journal article

The Roles of Ecological and Evolutionary Processes in Plant Community Assembly: The Environment, Hybridization, and Introgression Influence Co-occurrence of Eucalyptus

Laura J Pollock, Michael J Bayly, Peter A Vesk



Introgressive hybridization is increasingly recognized as having influenced the gene pools of large genera of plants, yet it is rarely invoked as an explanation for why closely related plant species do not co-occur. Here, we asked how the environment and tendency to interbreed relate to neighborhood co-occurrence patterns for Eucalyptus species in the Grampians National Park, Victoria, Australia. We identified species pairs that have experienced ongoing hybridization and introgression on the basis of the extent of incongruence between chloroplast DNA (JLA+ region) and nuclear ribosomal DNA (internal transcribed spacer region) phylogenies, geographic patterns of gene sharing, and field observ..

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Funding Acknowledgements

We thank C. Czembor, A. Davidson, and C. Jones for field help and W. Morris for help with analyses. This work was supported by the Holsworth Wildlife Research Endowment and an Eichler grant from the Australasian Systematic Botany Society. L.J.P. was supported by an Endeavour International Postgraduate Research Scholarship and a Melbourne Research Scholarship for the duration of this work. Support was provided through the National Environmental Research Program Research Hub for Environmental Decisions and Australian Research Council Center of Excellence in Environmental Decisions. We thank B. Bolker and several anonymous reviewers for comments that made us sharpen our thoughts.