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Article Dans Une Revue Oecologia Année : 2015

Age-specific survival and annual variation in survival of female chamois differ between populations

Résumé

In many species, population dynamics are shaped by age-structured demographic parameters, such as survival, which can cause age-specific sensitivity to environmental conditions. Accordingly, we can expect populations with different age-specific survival to be differently affected by environmental variation. However, this hypothesis is rarely tested at the intra-specific level. Using capture–mark–recapture models, we quantified age-specific survival and the extent of annual variations in survival of females of alpine chamois in two sites. In one population, survival was very high (>0.94; Bauges, France) until the onset of senescence at approximately 7 years old, whereas the two other populations (Swiss National Park, SNP) had a later onset (12 years old) and a lower rate of senescence. Senescence patterns are therefore not fixed within species. Annual variation in survival was higher in the Bauges (SD = 0.26) compared to the SNP populations (SD = 0.20). Also, in each population, the age classes with the lowest survival also experienced the largest temporal variation, in accordance with inter-specific comparisons showing a greater impact of environmental variation on these age classes. The large difference between the populations in age-specific survival and variation suggests that environmental variation and climate change will affect these populations differently.
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Dates et versions

hal-03187379 , version 1 (31-03-2021)

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Josefa Bleu, Ivar Herfindal, Anne Loison, Anne M. G. Kwak, Mathieu Garel, et al.. Age-specific survival and annual variation in survival of female chamois differ between populations. Oecologia, 2015, 179 (4), pp.1091-1098. ⟨10.1007/s00442-015-3420-5⟩. ⟨hal-03187379⟩
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