journal article
LitStream Collection
Home
doi: 10.1163/156853994X00505pmid: N/A
<jats:sec><jats:title>Abstract</jats:title><jats:p>This paper examines differences in male affiliative associations and dominance relationships in atelin primates. Despite the occurrence of male philopatry in all three genera, male social relations varied considerably. The strength of male affiliations was attributed to differences in between group competition for access to groups of females, while the type of male dominance relationships was attributed to differences in within group competition for access to individual females. Female grouping patterns and the socionomic sex ratio appeared to be more important than group size in predicting the strength of between group competition and male affiliations. Male dominance over females appeared to be more important than estrus synchrony in predicting the type of within group competition and the presence of hierarchical or egalitarian relationships among males.</jats:p> </jats:sec>
doi: 10.1163/156853994x00505pmid: N/A
AbstractThis paper examines differences in male affiliative associations and dominance relationships in atelin primates. Despite the occurrence of male philopatry in all three genera, male social relations varied considerably. The strength of male affiliations was attributed to differences in between group competition for access to groups of females, while the type of male dominance relationships was attributed to differences in within group competition for access to individual females. Female grouping patterns and the socionomic sex ratio appeared to be more important than group size in predicting the strength of between group competition and male affiliations. Male dominance over females appeared to be more important than estrus synchrony in predicting the type of within group competition and the presence of hierarchical or egalitarian relationships among males.
doi: 10.1163/156853994x00514pmid: N/A
Abstract1. Male South American squirrel monkeys form groups whose composition remains stable over migrations between troops. These groups are called 'migration alliances'. 2. Members of migration alliances support one another against other males through coalitions in genital display bouts both during immigration and throughout the year. Male alliances do not function to overcome female dominance. 3. Seasonal reproduction in squirrel monkeys may influence male alliances by a) intensification of within-group competition during the mating season, and b) production of temporally and spatially fluctuating mating opportunities between groups.
doi: 10.1163/156853994X00514pmid: N/A
<jats:sec><jats:title>Abstract</jats:title><jats:p>1. Male South American squirrel monkeys form groups whose composition remains stable over migrations between troops. These groups are called 'migration alliances'. 2. Members of migration alliances support one another against other males through coalitions in genital display bouts both during immigration and throughout the year. Male alliances do not function to overcome female dominance. 3. Seasonal reproduction in squirrel monkeys may influence male alliances by a) intensification of within-group competition during the mating season, and b) production of temporally and spatially fluctuating mating opportunities between groups.</jats:p> </jats:sec>
doi: 10.1163/156853994X00523pmid: N/A
<jats:sec><jats:title>Abstract</jats:title><jats:p>Remarkably close male bonding exists among Costa Rican squirrel monkeys, Saimiri oerstedi. In this population males were philopatric, exhibited no male-male within-troop aggression, and only very slight evidence for a dominance hierarchy. Juvenile, young and full adult males were spatially clumped in same-age male cohorts. A less intense, secondary association was also shown between the young and full adult male cohorts. These associations were most dense over a spatial scale of 5 m or less, but can also be detected in a 5-10 m distance from a focal male. Males also cooperated in 1) sexual investigation of females during the mating season, 2) aggressive interactions with males of neighboring troops, and 3) valiant defense of infants and subadults from potential predators. In contrast, the spatial association among adult females never exceeded random expectations and only a transitory period of cooperation was observed among mothers during the birth season. Furthermore, there was little evidence of bonds between the sexes. Seasonal variation in affiliation patterns was best explained by fluctuations in food availability and, secondarily, reproductive activity. These results are surprising both from the perspective of the general pattern of male affiliation among primates and the often marked aggression and dominance relationships among males documented in captive and wild populations of South American squirrel monkeys. The ultimate explanation is suggested to be the disparate distribution of fruit resources exploited by South and Central American squirrel monkeys, mediated by effects on female affiliation and dispersal patterns.</jats:p> </jats:sec>
doi: 10.1163/156853994x00523pmid: N/A
AbstractRemarkably close male bonding exists among Costa Rican squirrel monkeys, Saimiri oerstedi. In this population males were philopatric, exhibited no male-male within-troop aggression, and only very slight evidence for a dominance hierarchy. Juvenile, young and full adult males were spatially clumped in same-age male cohorts. A less intense, secondary association was also shown between the young and full adult male cohorts. These associations were most dense over a spatial scale of 5 m or less, but can also be detected in a 5-10 m distance from a focal male. Males also cooperated in 1) sexual investigation of females during the mating season, 2) aggressive interactions with males of neighboring troops, and 3) valiant defense of infants and subadults from potential predators. In contrast, the spatial association among adult females never exceeded random expectations and only a transitory period of cooperation was observed among mothers during the birth season. Furthermore, there was little evidence of bonds between the sexes. Seasonal variation in affiliation patterns was best explained by fluctuations in food availability and, secondarily, reproductive activity. These results are surprising both from the perspective of the general pattern of male affiliation among primates and the often marked aggression and dominance relationships among males documented in captive and wild populations of South American squirrel monkeys. The ultimate explanation is suggested to be the disparate distribution of fruit resources exploited by South and Central American squirrel monkeys, mediated by effects on female affiliation and dispersal patterns.
Furuichi, Takeshi; Ihobe, Hiroshi
doi: 10.1163/156853994x00532pmid: N/A
Abstract1. Inter-male relationships were compared between two groups of bonobos at Wamba, Zaire, and a group of chimpanzees at the Mahale Mountains, Tanzania. 2. Although distribution of females is much different between the two species, frequencies of affinitive interactions between males (inter-individual proximity and grooming) were similar between the species. 3. By contrast, marked inter-species differences were found in agonistic aspects of male relationships. Such differences could be related to the different estrus patterns of females. 4. Male relationships of both species may have been reflecting the male-bonded strategy which was taken by a common ancestor. Within this framework, males of each species seem to have developed differentiated social tactics for the access to females showing different patterns of distribution and estrus.
Ihobe, Hiroshi; Furuichi, Takeshi
doi: 10.1163/156853994X00532pmid: N/A
<jats:sec><jats:title>Abstract</jats:title><jats:p>1. Inter-male relationships were compared between two groups of bonobos at Wamba, Zaire, and a group of chimpanzees at the Mahale Mountains, Tanzania. 2. Although distribution of females is much different between the two species, frequencies of affinitive interactions between males (inter-individual proximity and grooming) were similar between the species. 3. By contrast, marked inter-species differences were found in agonistic aspects of male relationships. Such differences could be related to the different estrus patterns of females. 4. Male relationships of both species may have been reflecting the male-bonded strategy which was taken by a common ancestor. Within this framework, males of each species seem to have developed differentiated social tactics for the access to females showing different patterns of distribution and estrus.</jats:p> </jats:sec>
Showing 1 to 10 of 20 Articles