Abstract:
:The terminal allocation and senescence hypotheses make opposite predictions about how age-specific reproductive effort should vary during old age. There is empirical support for both hypotheses, although reports on senescence are more numerous. Individual heterogeneity and selective mortality, however, decrease our ability to measure how reproductive effort varies during late life. The damage accumulation model proposes that terminal allocation and senescence could be partly age-independent. Using a reverse-age approach, we analysed an unusually complete record of annual reproductive success for 90 bighorn ewes that died between 7 and 18years of age. We estimated age-specific and age-independent variation of reproductive effort in late-life. Reproductive effort decreased in the two last reproductions, independently of age at death. Fecundity also decreased in the last 2years of life, with a steeper decline for older individuals. Our study reveals that reproductive senescence includes both age-dependent and age-independent components.
journal_name
Ecol Lettjournal_title
Ecology lettersauthors
Martin JG,Festa-Bianchet Mdoi
10.1111/j.1461-0248.2011.01621.xsubject
Has Abstractpub_date
2011-06-01 00:00:00pages
576-81issue
6eissn
1461-023Xissn
1461-0248journal_volume
14pub_type
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