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Senescence in breeding success of female Alpine chamois (Rupicapra rupicapra): the role of female quality and age

Tettamanti, Federico and Grignolio, Stefano and Filli, Flurin and Apollonio, Marco and Bize, Pierre (2015) Senescence in breeding success of female Alpine chamois (Rupicapra rupicapra): the role of female quality and age. Oecologia , Vol. 178 (1), p. 187-195. ISSN 0029-8549. eISSN 1432-1939. Article.

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DOI: 10.1007/s00442-014-3197-y

Abstract

Although numerous studies have reported reproductive senescence in wild animal populations, we still know very little on inter-individual differences in rates of ageing and on the factors accounting for these differences. To investigate age-related variation in breeding success in a natural population of Alpine chamois (Rupicapra rupicapra), we used 15 years of data obtained by monitoring individual ear-tagged females. Analyses at the population level confirmed the occurrence of a decline in female breeding success, which is most noticeable from 9 years of age onward. Using an age-reverse approach, we showed that senescence in female breeding success occurs at the same age, since only very old individuals (older than 16 years) showed a decline in breeding success in the years preceding death. Interestingly, we also found evidence that ‘success comes from success’, as females that gave birth in a given year were more likely to procreate again in the following year. Moreover, results showed that discrepancies between successful and unsuccessful individuals tend to become more relevant in the oldest age classes. There was no evidence of a terminal allocation. These results emphasize the importance of age-dependent effects and individual quality in shaping reproductive senescence in a wild long-lived ungulate.

Item Type:Article
ID Code:10951
Status:Published
Refereed:Yes
Uncontrolled Keywords:Ageing, age dependency, longevity, individual quality, mammal
Subjects:Area 05 - Scienze biologiche > BIO/05 Zoologia
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze della Natura e del Territorio
Publisher:Springer Berlin Heidelberg
ISSN:0029-8549
eISSN:1432-1939
Deposited On:27 May 2015 09:42

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