Cooperative Breeding in Mammals by Nancy G. Solomon, Jeffrey A. French

By Nancy G. Solomon, Jeffrey A. French

Cooperative breeding refers to a social procedure during which contributors except the oldsters supply deal with the offspring. considering the fact that members hold up breeding and put money into the offspring of others, cooperative breeding poses a problem to a Darwinian rationalization of the evolution of social habit. The participants to this e-book discover the evolutionary, ecological, behavioral, and physiological foundation of cooperative breeding in mammals. The ebook encompasses a selection of chapters by way of the prime researchers within the box, and it's the first publication committed completely to the research of mammalian cooperative breeding.

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30:131-137. Rylands, A. B. (1982). Behaviour and ecology of three species of marmosets and tamarins {Callitrichidae, Primates) in Brazil. PhD dissertation, University of Cambridge, Cambridge. Rylands, A. B. (1986). Infant-carrying in a wild marmoset group, Callithrix humeralifer: evidence for a polyandrous mating system. In Primatologia No. , M. T. deMello, pp. 131-144. Brasilia: Sociedade Brasileira de Primatologia. Rylands, A. B. (1996). Habitat and the evolution of social and reproductive behaviour in Callitrichidae.

What are the costs of caring for infants, and how may they be expressed? If, for example, philopatry reduces fitness, but alloparental behaviors do not, then the strength of some adaptive arguments may be affected. Callitrichids are an excellent group in which to examine this question, given that infant care has long been assumed to be the primary feature shaping callitrichid social behavior (Kleiman 1977; Leutenegger 1980). 1 Immediate costs of alloparental behavior Three immediate costs of alloparental behavior in callitrichids have been hypothesized: the energetic cost of infant transport, increased risk of predation, and the reduced foraging time associated with infant transport.

Only one study of free-ranging callitrichids has examined the relationship between alloparents and infants. Baker (1991) examined the percentage of time that golden lion tamarins spent carrying infants to which they were more or less closely related. Males carried more closely related infants more often. For females, there was no difference. If inclusive fitness gains were the sole explanation for alloparental care, there would be no obvious reason for the benefits of carrying more closely related infants to be greater for males than for females, suggesting that other factors need to be examined in order to explain this difference.

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