Parental care and clutch sizes in North and South American birds.

  title={Parental care and clutch sizes in North and South American birds.},
  author={Thomas E Martin and Paul R Martin and Carl R. Olson and Britt Heidinger and J. J. H. Fontaine},
  volume={287 5457},
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… CONTINUE READING
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