Female competition and male territorial behaviour influence female chimpanzees' ranging patterns

Williams, Jennifer M.; Pusey, Anne E.; Carlis, John V.; Farm, Brian P.; Goodall, Jane

doi:10.1006/anbe.2001.1916

Cited by 158 publications

(191 citation statements)

References 23 publications

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“…In terms of intercommunity aggression, killings occur more frequently when the victim's party is greatly outnumbered (63); thus, the presence of males may provide some safety in numbers. However, Kasekela female core areas tend to be well within community boundaries (64), and evidence from the Kanyawara community in Uganda indicates females use boundary areas less than males (65). Thus, seeking protection from attacks by foreign males is unlikely to drive mothers to regularly associate more with adult males.…”

Section: Discussionmentioning

confidence: 99%

Early social exposure in wild chimpanzees: Mothers with sons are more gregarious than mothers with daughters

Murray

Lonsdorf

Stanton

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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In many mammals, early social experience is critical to developing species-appropriate adult behaviors. Although mother-infant interactions play an undeniably significant role in social development, other individuals in the social milieu may also influence infant outcomes. Additionally, the social skills necessary for adult success may differ between the sexes. In chimpanzees (Pan troglodytes), adult males are more gregarious than females and rely on a suite of competitive and cooperative relationships to obtain access to females. In fission-fusion species, including humans and chimpanzees, subgroup composition is labile and individuals can vary the number of individuals with whom they associate. Thus, mothers in these species have a variety of social options. In this study, we investigated whether wild chimpanzee maternal subgrouping patterns differed based on infant sex. Our results show that mothers of sons were more gregarious than mothers of daughters; differences were especially pronounced during the first 6 mo of life, when infant behavior is unlikely to influence maternal subgrouping. Furthermore, mothers with sons spent significantly more time in parties containing males during the first 6 mo. These early differences foreshadow the well-documented sex differences in adult social behavior, and maternal gregariousness may provide sons with important observational learning experiences and social exposure early in life. The presence of these patterns in chimpanzees raises questions concerning the evolutionary history of differential social exposure and its role in shaping sex-typical behavior in humans.infant socialization | maternal behavior | chimpanzees | fission-fusion species E arly socialization is critical to developing social competency later in life. In mammals, mothers have enormous influence on their offspring's early social experience, with implications for adult social behavior. In humans, the relative contribution of parental and others' social influence on the development of sextypical behavior receives considerable attention and is often debated (1-4). Comparative research provides insight into the origins and development of sex differences in the absence of human cultural sex socialization. Decades of research in rodent and primate models have demonstrated that social deprivation curtails the development of species-appropriate behaviors (5-8) and cognition (9, 10). Primate mothers are critical for the normal social development of their infants (11-13), with classic studies demonstrating that maternal deprivation is associated with intense anxiety (14), inappropriate aggression (15), and an inability to form social relationships (16). The mother-infant relationship is therefore critical to proper social development; however, research also demonstrates the importance of the larger social milieu (17)(18)(19)(20). For example, a recent study in mice found that early interactions with mothers and peers independently shape adult behavior (21). Likewise, some negative impacts of maternal deprivati...

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Section: Discussionmentioning

confidence: 99%

Early social exposure in wild chimpanzees: Mothers with sons are more gregarious than mothers with daughters

Murray

Lonsdorf

Stanton

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

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“…Females may also benefit from remaining in their natal range, as they can access known and valuable resources. For example, access to known resources is an important factor underlying maintenance of core areas in female chimpanzees (Williams et al 2002).…”

Section: Discussionmentioning

confidence: 99%

Dispersal Patterns of Orang-utans (Pongo spp.) in a Bornean Peat-swamp Forest

et al. 2010

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Knowledge regarding dispersal patterns in great apes may help in understanding the evolution of dispersal patterns and social grouping in early hominoids, as well as in our own species. However, the social structure and dispersal system of orang-utans (Pongo spp.) remains little understood despite past research. We addressed this question by conducting genetic analyses on a wild orang-utan (Pongo pygmaeus wurmbii) population from the Sabangau peat-swamp in Borneo. We estimated pairwise relatedness among 16 adult individuals using 19 polymorphic microsatellite markers. Mean relatedness among females was significantly higher than in males, irrespective of the relatedness estimator used, following the pattern predicted for male dispersal. Our results support field observations that average dispersal distance for females is less than for males, suggesting that female orangutans are philopatric, whereas males disperse. This contrasts with previous findings from other sites where anthropogenic influences were present. Based on qualitative mitochondrial DNA analyses, it appears that unflanged adult males show some degree of site fidelity compared to flanged males. Thus, male orang-utans may disperse permanently from their natal range once they are fully flanged. Male-biased dispersal and female philopatry in orang-utans differ from those of extant African apes and are more similar to many Old World monkey species. Hence we hypothesize that this system may represent the ancestral state of early hominoids.

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“…For more detail on longterm data collection at Kanyawara, see Gilby et al (2008), Emery Thompson et al (2007b), and Muller et al (2007). Data collection at Gombe was described by Goodall (1986), Williams et al (2002) and Gilby et al (2006).…”

Section: Gilby Et Al Pgmentioning

confidence: 99%