Evidence for ecological processes driving speciation among endemic lizards of Madagascar

Laura A. Nunes, Christopher J. Raxworthy & Richard G. Pearson
Although genetic patterns produced by population isolation during speciation are well documented, the biogeographic and ecological processes that trigger speciation remain poorly understood. Alternative hypotheses for the biogeography and ecology of speciation include geographic isolation combined with niche conservation (soft allopatry), or parapatric distribution on an environmental gradient with niche divergence (ecological speciation). Here we utilize species’ distributions, environmental data and two null models (Random Translation and Rotation, RTR, and the Background Similarity Test, BST)...
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