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Science 20 April 2001:
Vol. 292. no. 5516, pp. 494 - 497
DOI: 10.1126/science.1059379
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Reports
Fecundity-Survival Trade-Offs and Parental Risk-Taking in Birds
Cameron K. Ghalambor,*
Thomas E. Martin
Life history theory predicts that parents should value their own
survival over that of their offspring in species with a higher probability of adult survival and fewer offspring. We report that Southern Hemisphere birds have higher adult survival and smaller clutch
sizes than Northern Hemisphere birds. We subsequently manipulated predation risk to adults versus offspring in 10 species that were paired between North and South America on the basis of phylogeny and
ecology. As predicted, southern parents responded more strongly to
reduce mortality risk to themselves even at a cost to their offspring,
whereas northern parents responded more strongly to reduce risk to
their offspring even at greater risk to themselves.
U.S. Geological Survey Biological Resources Division, Montana
Cooperative Wildlife Research Unit, Avian Studies Program, University
of Montana, Missoula, MT 59812, USA.
*
Present address: Department of Biology, University of
California, Riverside, CA 92521, USA.
To whom correspondence should be addressed. E-mail:
camerong{at}citrus.ucr.edu
Read the Full Text
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