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How do characters evolve?

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  • Andy Purvis

    (Imperial College London, Silwood Park Campus, Ascot)

Abstract

Arising from: R. E. Ricklefs Nature 430, 338–341 (2004); Ricklefs replies . Ricklefs1 claims to show that morphological evolution in birds is associated with speciation events — that is, it is punctuational — by inference from data on only species number, clade age and character variance from a range of passerine clades. He suggests that variance increases in proportion with clade age under gradual change, but in proportion to the logarithm of species number if change is punctuational. Here I show that both clade age and the logarithm of species number independently predict variance under both gradual and punctuational change, rendering Ricklefs' results uninformative about his central hypothesis.

Suggested Citation

  • Andy Purvis, 2004. "How do characters evolve?," Nature, Nature, vol. 432(7014), pages 166-166, November.
    • Handle: RePEc:nat:nature:v:432:y:2004:i:7014:d:10.1038_nature03092
    DOI: 10.1038/nature03092
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