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Individual variation in age-dependent reproduction: Fast explorers live fast but senesce young?
Ludwig Maximilians Univ Munchen, Germany.
Max Planck Inst Ornithol, Germany; UMR 5175 Campus CNRS, France.
Max Planck Inst Ornithol, Germany; Norwegian Univ Sci and Technol, Norway.
Ludwig Maximilians Univ Munchen, Germany; Max Planck Inst Ornithol, Germany.
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2019 (English)In: Journal of Animal Ecology, ISSN 0021-8790, E-ISSN 1365-2656Article in journal (Refereed) Epub ahead of print
Abstract [en]

Adaptive integration of life history and behaviour is expected to result in variation in the pace-of-life. Previous work focused on whether risky phenotypes live fast but die young, but reported conflicting support. We posit that individuals exhibiting risky phenotypes may alternatively invest heavily in early-life reproduction but consequently suffer greater reproductive senescence. We used a 7-year longitudinal dataset with amp;gt;1,200 breeding records of amp;gt;800 female great tits assayed annually for exploratory behaviour to test whether within-individual age dependency of reproduction varied with exploratory behaviour. We controlled for biasing effects of selective (dis)appearance and within-individual behavioural plasticity. Slower and faster explorers produced moderate-sized clutches when young; faster explorers subsequently showed an increase in clutch size that diminished with age (with moderate support for declines when old), whereas slower explorers produced moderate-sized clutches throughout their lives. There was some evidence that the same pattern characterized annual fledgling success, if so, unpredictable environmental effects diluted personality-related differences in this downstream reproductive trait. Support for age-related selective appearance was apparent, but only when failing to appreciate within-individual plasticity in reproduction and behaviour. Our study identifies within-individual age-dependent reproduction, and reproductive senescence, as key components of life-history strategies that vary between individuals differing in risky behaviour. Future research should thus incorporate age-dependent reproduction in pace-of-life studies.

Place, publisher, year, edition, pages
WILEY , 2019.
Keywords [en]
age dependence; behaviour; life history; personality; reaction norms; reproduction; senescence; variance partitioning
National Category
Evolutionary Biology
Identifiers
URN: urn:nbn:se:liu:diva-162523DOI: 10.1111/1365-2656.13122ISI: 000496008100001PubMedID: 31618450OAI: oai:DiVA.org:liu-162523DiVA, id: diva2:1378747
Note

Funding Agencies|Deutsche ForschungsgemeinschaftGerman Research Foundation (DFG) [DI 1694/1-1]; Max Planck SocietyMax Planck SocietyFoundation CELLEX

Available from: 2019-12-13 Created: 2019-12-13 Last updated: 2020-01-22

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Abbey-Lee, Robin
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