Contrasting drivers of reproductive ageing in albatrosses

1. Age-related variation in reproductive performance is ubiquitous in wild vertebrate populations and has important consequences for population and evolutionary dynamics. 2. The ageing trajectory is shaped by both within-individual processes, such as improvement and senescence, and the among-individ...

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Bibliographic Details
Published in:The Journal of animal ecology 2017-09, Vol.86 (5), p.1022-1032
Main Authors: Froy, Hannah, Phillips, Richard A., Lewis, Sue, Nussey, Daniel H., Wood, Andrew G.
Format: Article
Language:English
Subjects:
Aging
Animal reproduction
Animals
Bird Island South Georgia
Birds
black‐browed albatross Thalassarche melanophris
Breeding
Breeding success
Evolutionary Ecology
grey‐headed albatross Thalassarche chrysostoma
life‐history trade‐off
Reproduction
selective disappearance
Senescence
Standard Paper
terminal effect
wandering albatross Diomedea exulans
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Summary:1. Age-related variation in reproductive performance is ubiquitous in wild vertebrate populations and has important consequences for population and evolutionary dynamics. 2. The ageing trajectory is shaped by both within-individual processes, such as improvement and senescence, and the among-individual effects of selective appearance and disappearance. To date, few studies have compared the role of these different drivers among species or populations. 3. In this study, we use nearly 40 years of longitudinal monitoring data to contrast the within- and among-individual processes contributing to the reproductive ageing patterns in three albatross species (two biennial and one annual breeder) and test whether these can be explained by differences in life histories. 4. Early-life performance in all species increased with age and was predominantly influenced by within-individual improvements. However, reproductive senescence was detected in only two of the species. In the species exhibiting senescent declines, we also detected a terminal improvement in breeding success. This is suggestive of a trade-off between reproduction and survival, which was supported by evidence of selective disappearance of good breeders. 5. We demonstrate that comparisons of closely related species which differ in specific aspects of their life history can shed light on the ecological and evolutionary forces shaping variation in ageing patterns.
ISSN:0021-8790
1365-2656
DOI:10.1111/1365-2656.12712