Live long and prosper : durable benefits of early-life care in banded mongooses

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Vitikainen , E I K , Thompson , F J , Marshall , H H & Cant , M A 2019 , ' Live long and prosper : durable benefits of early-life care in banded mongooses ' , Philosophical Transactions of the Royal Society. Biological Sciences , vol. 374 , no. 1770 , 20180114 . https://doi.org/10.1098/rstb.2018.0114

Title: Live long and prosper : durable benefits of early-life care in banded mongooses
Author: Vitikainen, Emma I. K.; Thompson, Faye J.; Marshall, Harry H.; Cant, Michael A.
Contributor: University of Helsinki, Evolution, Sociality & Behaviour
Date: 2019-02-25
Language: eng
Number of pages: 9
Belongs to series: Philosophical Transactions of the Royal Society. Biological Sciences
ISSN: 0962-8436
URI: http://hdl.handle.net/10138/300444
Abstract: Kin selection theory defines the conditions for which altruism or 'helping' can be favoured by natural selection. Tests of this theory in cooperatively breeding animals have focused on the short-term benefits to the recipients of help, such as improved growth or survival to adulthood. However, research on early-life effects suggests that there may be more durable, lifelong fitness impacts to the recipients of help, which in theory should strengthen selection for helping. Here, we show in cooperatively breeding banded mongooses (Mungos mungo) that care received in the first 3 months of life has lifelong fitness benefits for both male and female recipients. In this species, adult helpers called 'escorts' form exclusive one-to-one caring relationships with specific pups (not their own offspring), allowing us to isolate the effects of being escorted on later reproduction and survival. Pups that were more closely escorted were heavier at sexual maturity, which was associated with higher lifetime reproductive success for both sexes. Moreover, for female offspring, lifetime reproductive success increased with the level of escorting received per se, over and above any effect on body mass. Our results suggest that early-life social care has durable benefits to offspring of both sexes in this species. Given the well-established developmental effects of early-life care in laboratory animals and humans, we suggest that similar effects are likely to be widespread in social animals more generally. We discuss some of the implications of durable fitness benefits for the evolution of intergenerational helping in cooperative animal societies, including humans. This article is part of the theme issue 'Developing differences: early-life effects and evolutionary medicine'.
Subject: early-life effects
cooperative breeding
inclusive fitness
lifetime reproductive success
selective disappearance
social evolution
FEMALE REPRODUCTIVE COMPETITION
HELPERS INCREASE
SOCIAL-CONTROL
MATERNAL-CARE
EVOLUTION
EVICTION
DEMOGRAPHY
MENOPAUSE
PARENTAGE
CONFLICT
1181 Ecology, evolutionary biology
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