期刊
FUNCTIONAL ECOLOGY
卷 31, 期 4, 页码 894-902出版社
WILEY
DOI: 10.1111/1365-2435.12808
关键词
hyena; hormones; insulin-like growth factor-1; life history; lifespan; postnatal development; trade-offs
类别
资金
- NSF [DEB1353110, IOS1121474]
- NIH [1R01GM105042]
- NSF Graduate Research Fellowships
- NSF Postdoctoral Fellowship in Biology [1306627]
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [1353110] Funding Source: National Science Foundation
- Office Of The Director
- Office Of Internatl Science &Engineering [1556407] Funding Source: National Science Foundation
- Office Of The Director
- Office Of Internatl Science &Engineering [1260768] Funding Source: National Science Foundation
1. Early postnatal development can have profound effects on life-history traits later in life. One mechanism hypothesized to mediate this relationship is the anabolic hormone, insulin-like growth factor-1 (IGF-1). IGF-1 contributes importantly to postnatal growth, and thus offers a means by which environmental and genetic variation might direct organismal development, reproduction and survival. 2. We tested whether juvenile concentrations of IGF-1 can predict intraspecific variation in life-history traits later in life using longitudinal data from free-living female spotted hyenas (Crocuta crocuta). 3. We found that juvenile concentrations of IGF-1 predicted heavier juvenile mass, which in turn predicted greater survival to reproductive maturity. However, independent of mass, higher juvenile concentrations of IGF-1 predicted earlier age at first parturition and reduced longevity in adulthood. 4. Our results highlight the importance of early postnatal development as a determination period in mammals and suggest that concentrations of IGF-1 during this sensitive period can be used to predict important later-life trade-offs between growth, reproductive fitness and life span in wild, long-lived animals.
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