Present address: Centre for Applied Conservation Research, Forest Sciences 3rd floor, 2424 Main Mall, University of British Columbia, Vancouver BC, Canada V6T 1Z4.
Environmental variability, life-history covariation and cohort effects in the red-billed chough Pyrrhocorax pyrrhocorax
Article first published online: 10 FEB 2003
Journal of Animal Ecology
Volume 72, Issue 1, pages 36–46, January 2003
How to Cite
Reid, J. M., Bignal, E. M., Bignal, S., McCracken, D. I. and Monaghan, P. (2003), Environmental variability, life-history covariation and cohort effects in the red-billed chough Pyrrhocorax pyrrhocorax. Journal of Animal Ecology, 72: 36–46. doi: 10.1046/j.1365-2656.2003.00673.x
- Issue published online: 10 FEB 2003
- Article first published online: 10 FEB 2003
- Received 25 March 2002; accepted 5 August 2002
- life history evolution;
- reproductive performance;
- delayed life history effects;
- natal environment;
- parental investment;
- silver spoon
- 1The consequences of environmental variability for life-history evolution are predicted to depend on the pattern of covariation amongst life-history traits. Using data from a 20-year study of individually marked red-billed choughs, we investigate the short- and long-term life-history consequences of population-wide variation in reproductive conditions, and demonstrate clear among-cohort variation and covariation in life-history parameters.
- 2The mean number of offspring fledging per breeding event varied among years, and was correlated with environmental conditions (temperature and rainfall) during the months preceding breeding. As the variance in breeding performance did not differ among years and choughs did not miss breeding seasons, variation in environmental conditions affected the whole breeding population. Thus the quality of the chough's breeding environment varied amongst years.
- 3Juvenile survival, the probability of recruitment to the breeding population and breeding longevity varied amongst cohorts, and these were positively correlated with the quality of the cohort's natal environment. Offspring fledging under good conditions were more likely to survive to breeding age and recruit, and had longer breeding lives than offspring fledging under poor conditions.
- 4Age at first breeding varied amongst cohorts, and increased with population size at maturity rather than natal conditions.
- 5The total number of offspring that recruits ultimately fledged varied primarily with breeding longevity rather than recruitment age. Thus, the consistent positive covariation amongst life-history traits meant that the total number of offspring fledged by recruits during their breeding life varied amongst cohorts, and was correlated with the quality of a cohort's natal conditions. Choughs fledging under good conditions themselves ultimately fledged more offspring.
- 6Such environmentally determined variation in offspring fitness is expected to influence optimal patterns of parental investment. We discuss the predictions that environmental variability should select for investment in adult survival and for reduced reproductive effort in poor years.