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Population Biology of Marine Iguanas (Amblyrhynchus cristatus). II. Changes in Annual Survival Rates and the Effects of Size, Sex, Age and Fecundity in a Population Crash

W. A. Laurie and D. Brown
Journal of Animal Ecology
Vol. 59, No. 2 (Jun., 1990), pp. 529-544
DOI: 10.2307/4879
Stable URL: http://www.jstor.org/stable/4879
Page Count: 16
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Population Biology of Marine Iguanas (Amblyrhynchus cristatus). II. Changes in Annual Survival Rates and the Effects of Size, Sex, Age and Fecundity in a Population Crash
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Abstract

(1) Annual survival rates of marine iguanas (Amblyrhynchus cristatus) on Galapagos were estimated using recapture and resightings of marked individuals. (2) There was 60-70% overall mortality due to starvation, during the 1982-1983 El Nino-Southern Oscillation Event. (3) Adult males suffered higher mortality than adult females over the period of food shortage, but size explained most of the difference in mortality between the sexes. (4) There was a cost of breeding for females, in terms of survival, in 1 of the 5 years of the study. (5) Larger hatchlings and yearlings survived better over the El Nino period than smaller ones, and there was selection for 2 and 3-year-olds that weighed more in 1981, at emergence, or at 1-year-old, respectively.

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