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Science 6 May 1988:
Vol. 240. no. 4853, pp. 798 - 799
DOI: 10.1126/science.3363360
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Articles

Science, Vol 240, Issue 4853, 798-799
Copyright © 1988 by American Association for the Advancement of Science

articles

Directional selection and the evolution of breeding date in birds

T Price, M Kirkpatrick, and SJ Arnold

Department of Biology, University of California, San Diego, La Jolla 92093.

In many bird species, those pairs that breed earlier in the season have higher reproductive success than those that breed later. Since breeding date is known to be heritable, it is unclear why it does not evolve to an earlier time. Under assumptions outlined by Fisher, a model is developed that shows how breeding date may have considerable additive genetic variance, appear to be under directional selection, and yet not evolve. These results provide a general explanation for a persistent correlation of fitness with a variety of traits in natural populations.


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