Effects of climate variability on the temporal population dynamics of southern fulmars
Article first published online: 3 JUL 2003
Journal of Animal Ecology
Volume 72, Issue 4, pages 576–587, July 2003
How to Cite
Jenouvrier, S., Barbraud, C. and Weimerskirch, H. (2003), Effects of climate variability on the temporal population dynamics of southern fulmars. Journal of Animal Ecology, 72: 576–587. doi: 10.1046/j.1365-2656.2003.00727.x
- Issue published online: 3 JUL 2003
- Article first published online: 3 JUL 2003
- Received 24 October 2002; revision received 6 March 2003
- Antarctic environment;
- matrix population model;
- survival analysis
- 1Ecological and population processes are affected by large-scale climatic fluctuations, and top predators such as seabirds can provide an integrative view on the consequences of environmental variability on ecosystems. Here, we examine the dynamics of a southern fulmar population in Antarctica over a 39-year period and evaluate the impact of environmental variability on the life history traits of this top predator species.
- 2Between 1963 and 2002, the number of breeding pairs fluctuated between seven and 53 in relation to variations in sea ice concentration, and increased overall (annual growth rate: 1·0035). Breeding performance tended to be lower in years with low sea ice concentration. The proportion of birds attempting to breed varied strongly from one year to the next despite the birds were alive, indicating strong environmental forcing on the decision to breed. The number of new local recruits and immigrants was correlated highly with the number of local breeders, and capture probabilities were positively related to the breeding population size. Local recruitment, number of local breeders and proportion of birds attempting to breed were lower when sea ice concentration during summer was low.
- 3Adult survival between 1964 and 2002 was on average 0·923 ± 0·006, and decreased during years with high sea surface temperature and low sea ice concentration.
- 4Modelled population growth rate, estimated using matrix models, of the population was 0·9728, a difference of 3·6% compared to the observed rate of increase. This discrepancy is due probably to the immigration rate (3 ± 3%).
- 5Demographic parameters were affected by sea ice concentration and sea surface temperature anomalies, probably through an impact on krill availability, the main prey of southern fulmars. During warm anomalies, birds skip breeding probably because the food availability was low and limiting for the highly energy demanding reproductive activities.
- 6We also emphasize that demographic parameters were very low during the period 1975–80 and showed a higher variability after 1980, which could be interpreted in the context of a regime shift. Our study indicates that the southern fulmar population dynamics may be very susceptible to environmental variability. Further long-lasting warm anomalies are likely to affect negatively their populations.