Species diversity can drive speciation

@article{Emerson2005SpeciesDC,
  title={Species diversity can drive speciation},
  author={Brent C. Emerson and Niclas Kolm},
  journal={Nature},
  year={2005},
  volume={434},
  pages={1015-1017}
}
A fundamental question in evolutionary ecology and conservation biology is: why do some areas contain greater species diversity than others? Island biogeographic theory has identified the roles of immigration and extinction in relation to area size and proximity to source areas, and the role of speciation is also recognized as an important factor. However, one as yet unexplored possibility is that species diversity itself might help to promote speciation, and indeed the central tenets of island… 
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