Environmental variability, life-history covariation and cohort effects in the red-billed chough Pyrrhocorax pyrrhocorax

The 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. The 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. Juvenile 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. Age at first breeding varied amongst cohorts, and increased with population size at maturity rather than natal conditions.

M. Reid, E. M. Bignal, S. Bignal, D. I. McCracken and P. Monaghan, Journal of Animal Ecology 72 (1), 36-46