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Article Dans Une Revue Polar Biology Année : 2006

Relationships between sea ice concentration, sea surface temperature and demographic traits of thin-billed prions

Résumé

Understanding the effects of environmental variations on ecosystems is a major topic in ecology. In this study, we estimated demographic parameters of a seabird population, the thin-billed prion (Pachyptila belcheri) at Kerguelen Islands, and then tested for relationships with inter-annual variations of climatic indices, using long-term capture–recapture data. The annual adult survival probability was 0.825±0.009 and the breeding success was 0.519±0.090. Sea surface temperature anomalies were negatively related with breeding success. By contrast, winter sea ice concentration in the Antarctic seasonal ice zone seemed to negatively influence adult survival. This suggests a connection between sub-Antarctic and Antarctic ecosystems. The actual context of large climatic changes in the Austral Ocean seems to explain a large part of the decreasing trends observed for both the breeding success and the adult survival. Thus, a decrease of the population size of thinbilled prions at Kerguelen could be strongly suspected in the near future.

Dates et versions

hal-00184597 , version 1 (31-10-2007)

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Marie Nevoux, Christophe Barbraud. Relationships between sea ice concentration, sea surface temperature and demographic traits of thin-billed prions. Polar Biology, 2006, 29 (6), pp.445-453. ⟨10.1007/s00300-005-0075-4⟩. ⟨hal-00184597⟩

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