Social and seasonal influences on reproductive biology in male moustached tamarins (Saguinus mystax)

Callitrichid primates typically give birth to twin offspring that are somatic chimeras of cells derived from two products of conception. Each individual is thus the phenotype of two sibling genotypes, one of which may be more closely related to the germ line of the individual's parents than to the individual's own germ line. Chimerism could therefore help to explain the evolution of alloparental care and social suppression of reproduction in callitrichids. Placental chimerism may also have important implications for understanding kin interactions within the womb: on one side of the coin, the intimate juxtaposition of genotypes provides unique opportunities for antagonistic interactions between embryos; on the other side, chimerism could facilitate cooperation between sibling genotypes. Am. J. Primatol. 49:285–296, 1999. © 1999 Wiley‐Liss, Inc.

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One for all and breeding for one: Cooperation and competition as a tamarin reproductive strategy

Garber

1997

Evol. Anthropol.

160

141

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In this paper I examine behavioral strategies used by male and female tamarins to increase individual reproductive opportunities while continuing to maintain a high level of group cohesion and social cooperation. Tamarins of the genus Saguinus are characterized by social groups generally composed of more than one adult of each sex, but a breeding system in which only a single female in each group gives birth. The breeding sovereignty of a single dominant female limits the reproductive opportunities of subordinate females as well as the reproductive opportunities of resident adult males.1‐3 Despite extreme variability in year‐to‐year reproductive success among members of the same social group, field studies indicate that within‐group intrasexual aggression and fighting are rare, and that both breeding and nonbreeding individuals expend time and energy cooperatively caring for young, defending productive feeding sites, and assisting in food harvesting activities.4‐11 In fact, Caine12 has argued that “co‐operation, tolerance, and flexibility” are the primary themes of tamarin social interactions (p. 218). A major question that remains unanswered, however, is how such high levels of cooperation could have evolved in a social system characterized by emigration of both adult males and females from the natal group, polyandrous mating, and intense reproductive competition.

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Social and seasonal influences on reproductive biology in male moustached tamarins (Saguinus mystax)

Cited by 17 publications

References 50 publications

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One for all and breeding for one: Cooperation and competition as a tamarin reproductive strategy

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