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Competition, predation and natural selection in island lizards


Arising from R. Calsbeek & R. M. Cox Nature 465, 613–616 (2010)10.1038/nature09020; Calsbeek and Cox reply

Discerning the relative influence of competition and predation as selective forces is an important goal of evolutionary ecology. Calsbeek and Cox1 argue that intraspecific competition outweighs predation as an agent of natural selection on island populations of the lizard Anolis sagrei. However, we identify several problems with the design and analysis of the Calsbeek and Cox1 study that we believe render its results uninterpretable.

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Figure 1: Confounding relationships among treatments and variables.


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Author information




J.B.L. and R.M.P. analysed data and wrote the paper.

Corresponding author

Correspondence to Jonathan B. Losos.

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Competing financial interests: declared none

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Losos, J., Pringle, R. Competition, predation and natural selection in island lizards. Nature 475, E1–E2 (2011).

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