Individual covariation in life-history traits: seeing the trees despite the forest

The American Naturalist
Emmanuelle CamEtienne Danchin

Abstract

We investigated the influence of age on survival and breeding rates in a long-lived species Rissa tridactyla using models with individual random effects permitting variation and covariation in fitness components among individuals. Differences in survival or breeding probabilities among individuals are substantial, and there was positive covariation between survival and breeding probability; birds that were more likely to survive were also more likely to breed, given that they survived. The pattern of age-related variation in these rates detected at the individual level differed from that observed at the population level. Our results provided confirmation of what has been suggested by other investigators: within-cohort phenotypic selection can mask senescence. Although this phenomenon has been extensively studied in humans and captive animals, conclusive evidence of the discrepancy between population-level and individual-level patterns of age-related variation in life-history traits is extremely rare in wild animal populations. Evolutionary studies of the influence of age on life-history traits should use approaches differentiating population level from the genuine influence of age: only the latter is relevant to theories of lif...Continue Reading

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Citations

Jul 16, 2011·Oecologia·Nathalie PettorelliJean-Michel Gaillard
Aug 25, 2006·Proceedings. Biological Sciences·Sébastien DescampsJean-Michel Gaillard
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