Aggressive intergroup encounters in two populations of Japanese macaques (Macaca fuscata)

Saito, Chiemi; Sato, Shizue; Suzuki, Shigeru; Sugiura, Hideki; Agetsuma, Naoki; Takahata, Yukio; Sasaki, Chisato; Takahashi, Hiroyuki; Tanaka, Toshiaki; Yamagiwa, Juichi

doi:10.1007/bf02573079

Cited by 73 publications

(36 citation statements)

References 22 publications

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“…Previous studies have suggested that the presence of other individuals is beneficial for foraging when inter-group competition is severe (Wrangham, 1980;Janson & van Schaik, 1988) and when predation pressure is high (Berger, 1978;Caraco, 1979;Sullivan, 1984). However, in our study area, macaques have no predators (Izawa, 1983) and inter-group encounters occur infrequently (Saito et al, 1998). In fact, there was no interaction with neighboring groups during the study seasons (personal observation).…”

Section: Social Factors Enhancing Foraging Successmentioning

confidence: 52%

Social factors enhancing foraging success of a wild group of Japanese macaques (Macaca fuscata) in a patchy food environment

Kazahari

Agetsuma

2008

Behav

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SummaryWe evaluated the effects of social factors and food quality on patch use by a wild group of Japanese macaques (Macaca fuscata) that experienced no inter-group feeding competition or predation risk. We obtained the following results: (1) Food patch depletion and within-group scramble competition for food apparently did not affect patch use. (2) Within-group contest competition (aggressive interactions related to social-dominance rank) also did not strongly affect patch use. (3) The number of co-feeders in the same patch consistently showed positive effects on patch use, while food quality did not have consistent effects. These results suggest that the presence of co-feeders enhances foraging success in a patchy food environment.

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Section: Social Factors Enhancing Foraging Successmentioning

confidence: 52%

Social factors enhancing foraging success of a wild group of Japanese macaques (Macaca fuscata) in a patchy food environment

Kazahari

Agetsuma

2008

Behav

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“…Therefore, inter-troop competition did not seem to cause the cooperation among troop males. Saito et al (1998) suggested that, in Yakushima island, troop males defend females from males of other troops dur-ing inter-troop encounters. In fact, I observed one case of inter-troop mating around the Momoe troop.…”

Section: Discussionmentioning

confidence: 99%

“…They reported a greater frequency and number of partners in male-male grooming in Yakushima island, whereas femalefemale and male-female grooming did not differ between the two island habitats. They theorized that a higher socionomic sex ratio (SSR: adult males/adult females) and stronger between-group competition in Yakushima island (Saito et al, 1998;Yamagiwa and Hill, 1998) caused male-male affiliative relationships. They assumed that males groomed one another to reduce tension among themselves, and thus formed a cooperative relationship in fights with neighboring troops.…”

Section: Introductionmentioning

confidence: 99%

Social relationships of male Japanese macaques (Macaca fuscata) in different habitats: a comparison between Yakushima island and Shimokita peninsula populations

Horiuchi

2007

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Wild troops of the Japanese macaque (Macaca fuscata) live in various habitats within the Japanese archipelago. The social relationships of males can be elucidated through intraspecific comparisons of social conditions between populations of different habitats. Previous research has shown that males associate with one another more frequently on Yakushima island than on Kinkazan island, whereas male-female and female-female relationships did not differ between populations that occupy the two different habitats. However, this study did not compare the social relationships of males between habitats during the mating season, when males are expected to compete for fertile females more aggressively within and between troops. The present study compared male behavior in Yakushima island and the Shimokita peninsula populations during the mating season and found that males exchanged affiliative behaviors with one another more frequently on Yakushima island. The socionomic sex ratio (SSR: adult males/adult females) was higher in the Yakushima island troop, and this troop was involved in inter-troop encounters more frequently. In Yakushima island, more non-troop males were observed around the troop and were frequently involved in agonistic interactions with troop males. Yakushima island troop males are likely to affiliate with one another to reduce tension among themselves, in order to cooperatively attack neighboring troops and non-troop males that appear to copulate with fertile females.

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“…Intergroup relationships are often agonistic in the study population, and members frequently look toward the neighboring group during intergroup encounters [Saito et al, 1998]. However, the frequency of intergroup encounters in the study population was very low (0.04 encounters per hour) [Sugiura et al, 2000].…”

Section: Discussion Visual Monitoringmentioning

confidence: 99%

Effects of proximity and activity on visual and auditory monitoring in wild Japanese Macaques

Suzuki

Sugiura

2011

American J Primatol

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Group-living primates monitor group members to maintain the spatial cohesiveness of the group. We examined the possibility that visual scanning (turning the head for more than 3 sec) and contact calls (coo calls) function as visual and auditory monitoring behaviors to avoid separation from group members in wild Japanese macaques. The rate of visual scanning increased as proximity to group members decreased and as mobile activities (foraging and moving) increased, compared with immobile activities (resting and grooming). However, the rate of contact calls varied differently with proximity and activities. During resting and moving, the rate of contact calls increased as proximity decreased. In contrast, the rate increased with closer proximity during feeding. Visual scanning during all activities and contact calls during resting and moving increased when the group members were likely to spread over a larger area, suggesting that these behaviors functioned as monitoring of group members to avoid separation from the group. Contact calls also increased when the group members stayed in close proximity during foraging, suggesting that this behavior was also associated with competitive situations. Contact calls may also function to ease tension or maintain distance to avoid conflict in competitive situations.

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Aggressive intergroup encounters in two populations of Japanese macaques (Macaca fuscata)

Cited by 73 publications

References 22 publications

Social factors enhancing foraging success of a wild group of Japanese macaques (Macaca fuscata) in a patchy food environment

Social factors enhancing foraging success of a wild group of Japanese macaques (Macaca fuscata) in a patchy food environment

Social relationships of male Japanese macaques (Macaca fuscata) in different habitats: a comparison between Yakushima island and Shimokita peninsula populations

Effects of proximity and activity on visual and auditory monitoring in wild Japanese Macaques

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