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Journal of Animal Ecology 2001
 

Summary: Journal of Animal
Ecology 2001
70, 539545
2001 British
Ecological Society
Blackwell Science, Ltd
Food limitation explains most clutch size variation in
the Nazca booby
L. D. CLIFFORD and D. J. ANDERSON
Wake Forest University, Box 7325 Reynolda Station, Department of Biology, Wake Forest University, Winston-Salem,
NC 27109, USA
Summary
1. Natural selection is expected to optimize clutch size, but intrapopulation variation is
maintained in many bird species. The Nazca booby provides a simple system in which
to investigate clutch size evolution because clutch size and brood size are decoupled due
toobligatesiblicide.Theindirecteffectof broodsizeonclutchsizeevolutioncantherefore
be eliminated.
2. In Nazca boobies, second eggs provide insurance against the failure of the first egg
or early death of the first hatchling, but approximately half of all females lay only one
egg. We tested the hypothesis that one-egg clutches result from food limitation by

  

Source: Anderson, David J. - Department of Biology, Wake Forest University

 

Collections: Environmental Sciences and Ecology