Report

Parental Care and Clutch Sizes in North and South American Birds

Science  25 Feb 2000:
Vol. 287, Issue 5457, pp. 1482-1485
DOI: 10.1126/science.287.5457.1482

Abstract

The evolutionary causes of small clutch sizes in tropical and Southern Hemisphere regions are poorly understood. Alexander Skutch proposed 50 years ago that higher nest predation in the south constrains the rate at which parent birds can deliver food to young and thereby constrains clutch size by limiting the number of young that parents can feed. This hypothesis for explaining differences in clutch size and parental behaviors between latitudes has remained untested. Here, a detailed study of bird species in Arizona and Argentina shows that Skutch's hypothesis explains clutch size variation within North and South America. However, neither Skutch's hypothesis nor two major alternatives explain differences between latitudes.

  • * To whom correspondence should be addressed. E-mail: tmartin{at}selway.umt.edu

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