Geometric constraints explain much of the species richness pattern in African birds.

@article{Jetz2001GeometricCE,
  title={Geometric constraints explain much of the species richness pattern in African birds.},
  author={Walter Jetz and Carsten Rahbek},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2001},
  volume={98 10},
  pages={5661-6}
}
The world contains boundaries (e.g., continental edge for terrestrial taxa) that impose geometric constraints on the distribution of species ranges. Thus, contrary to traditional thinking, the expected species richness pattern in absence of ecological or physiographical factors is unlikely to be uniform. Species richness has been shown to peak in the middle of a bounded one-dimensional domain, even in the absence of ecological or physiographical factors. Because species ranges are not linear… CONTINUE READING

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