Journal
BIOLOGY LETTERS
Volume 1, Issue 1, Pages 60-63Publisher
ROYAL SOCIETY
DOI: 10.1098/rsbl.2004.0245
Keywords
glucocorticoid; lemur; mortality; survival; cortisol; faecal steroid
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Glucocorticoid levels are commonly used as measures of stress in wild animal populations, but their relevance to individual fitness in a wild population has not been demonstrated. In this study I followed 93 ring-tailed lemurs (Lemur catta) at Berenty Reserve in Madagascar, collecting 1089 faecal samples from individually recognized animals, and recording their survival over a 2 year period. I evaluated faecal glucocorticoid levels as predictors of individual survival to the end of the study. Animals, with high glucocorticoid levels had a significantly higher mortality rate. This result suggests that glucocorticoid. measures can be useful predictors of individual survival probabilities in wild populations. The 'stress landscape' indicated by glucocorticoid patterns may approximate the fitness landscape to which animals adapt.
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