Age‐related variation in reproductive traits in the wandering albatross: evidence for terminal improvement following senescence

Froy, Hannah; Phillips, Richard A.; Wood, Andrew G.; Nussey, Daniel H.; Lewis, Sue

doi:10.1111/ele.12092

Cited by 110 publications

(146 citation statements)

References 43 publications

(84 reference statements)

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“…As in recently published studies [20], extreme values of age (more than 42 years) were collapsed into a single group (42 years) for analyses to avoid extreme values, with very low sample sizes, driving relationships.…”

Section: Materials and Methods (A) Data Collection (I) Study Systemmentioning

confidence: 99%

“…(2) Early and late adulthood analyses. For the full dataset, because not all individuals were studied across their entire lifetime, there may be an interaction between individual level changes in reproductive success with age and sampling regime, which has previously been reported in studies examining wandering albatross senescence [20]. Given the complexity of a model accounting for such an interaction, we are unable to fit this model, prohibiting the estimation of within individual senescence effects.…”

Section: (Iii) Reproductive Successmentioning

confidence: 99%

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Senescence rates and late adulthood reproductive success are strongly influenced by personality in a long-lived seabird

Patrick

Weimerskirch

2015

Proc. R. Soc. B.

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Studies are increasingly demonstrating that individuals differ in their rate of ageing, and this is postulated to emerge from a trade-off between current and future reproduction. Recent theory predicts a correlation between individual personality and life-history strategy, and from this comes the prediction that personality may predict the intensity of senescence. Here we show that boldness correlates with reproductive success and foraging behaviour in wandering albatrosses, with strong sex-specific differences. Shy males show a strong decline in reproductive performance with age, and bold females have lower reproductive success in later adulthood. In both sexes, bolder birds have longer foraging trips and gain more mass per trip as they get older. However, the benefit of this behaviour appears to differ between the sexes, such that it is only matched by high reproductive success in males. Together our results suggest that personality linked foraging adaptations with age are strongly sex-specific in their fitness benefits and that the impact of boldness on senescence is linked to ecological parameters.

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Section: Materials and Methods (A) Data Collection (I) Study Systemmentioning

confidence: 99%

Section: (Iii) Reproductive Successmentioning

confidence: 99%

Senescence rates and late adulthood reproductive success are strongly influenced by personality in a long-lived seabird

Patrick

Weimerskirch

2015

Proc. R. Soc. B.

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“…In other words, reproductive costs themselves can be dependent on the age. For example, reproduction can be more costly in young individuals [76] or on the contrary more costly in old individuals [77], or appear more costly due to terminal investment [78]. Therefore, studies combining the information of age effects and life-history tradeoffs should be developed to strengthen comparative studies and to improve our general understanding of such patterns.…”

Section: Tests Of Direct Costs Of Reproduction In Malesmentioning

confidence: 99%

Reproductive costs in terrestrial male vertebrates: insights from bird studies

2016

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Reproduction requires resources that cannot be allocated to other functions resulting in direct reproductive costs (i.e. trade-offs between current reproduction and subsequent survival/reproduction). In wild vertebrates, direct reproductive costs have been widely described in females, but their occurrence in males remains to be explored. To fill this gap, we gathered 53 studies on 48 species testing direct reproductive costs in male vertebrates. We found a trade-off between current reproduction and subsequent performances in 29% of the species and in every clade. As 73% of the studied species are birds, we focused on that clade to investigate whether such trade-offs are associated with (i) levels of paternal care, (ii) polygyny or (iii) pace of life. More precisely for this third question, it is expected that fast species (i.e. short lifespan, early maturity, high fecundity) pay a cost in terms of survival, whereas slow species (with opposite characteristics) do so in terms of fecundity. Our findings tend to support this hypothesis. Finally, we pointed out the potential confounding effects that should be accounted for when investigating reproductive costs in males and strongly encourage the investigation of such costs in more clades to understand to what extent our results are relevant for other vertebrates.

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“…From a biological perspective, this approach may allow detection of terminal illness (Coulson & Fairweather, 2001), terminal investment (Williams, 1966) or terminal allocation (sensu Weladji et al., 2010; e.g., see Froy et al., 2013). It does not, however, allow detection of more gradual senescent decreases toward the end of life.…”

Section: Introductionmentioning

confidence: 99%

Age, state, environment, and season dependence of senescence in body mass

Kroeger

Blumstein

Armitage

et al. 2018

Ecology and Evolution

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Senescence is a highly variable process that comprises both age‐dependent and state‐dependent components and can be greatly affected by environmental conditions. However, few studies have quantified the magnitude of age‐dependent and state‐dependent senescence in key life‐history traits across individuals inhabiting different spatially structured and seasonal environments. We used longitudinal data from wild female yellow‐bellied marmots (Marmota flaviventer), living in two adjacent environments that differ in elevation and associated phenology, to quantify how age and individual state, measured as “time to death,” affect body mass senescence in different environments. Further, we quantified how patterns of senescence differed between two biologically distinct seasons, spring, and late summer. Body mass senescence had an age‐dependent component, expressed as a decrease in mass in old age. Overall, estimated age‐dependent senescence was greater in females living in the more favorable lower elevation environment, than in the harsher higher elevation environment, and greater in late summer than in spring. Body mass senescence also had a state‐dependent component, captured by effects of time to death, but only in the more favorable lower elevation environment. In spring, body mass gradually decreased from 2 years before death, whereas in late summer, state‐dependent effects were expressed as a terminal decrease in body mass in the last year of life. Contrary to expectations, we found that senescence was more likely to be observed under more favorable environmental conditions, rather than under harsher conditions. By further demonstrating that senescence patterns differ among seasons, our results imply that within‐year temporal environmental variation must be considered alongside spatial environmental variation in order to characterize and understand the pattern and magnitude of senescence in wild populations.

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Age‐related variation in reproductive traits in the wandering albatross: evidence for terminal improvement following senescence

Cited by 110 publications

References 43 publications

Senescence rates and late adulthood reproductive success are strongly influenced by personality in a long-lived seabird

Senescence rates and late adulthood reproductive success are strongly influenced by personality in a long-lived seabird

Reproductive costs in terrestrial male vertebrates: insights from bird studies

Age, state, environment, and season dependence of senescence in body mass

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