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Huddling relationships in night sleeping groups among wild Japanese macaques in Kinkazan Island during winter

Content Provider	Springer Nature Link
Author	Takahashi, Hiroyuki
Copyright Year	1997
Abstract	Huddling groups at sleeping sites, and allogrooming and proximity in the daytime during winter, were examined in a wild Japanese macaque (Macaca fuscata) troop on Kinkazan Island in the non-snowy district of northern Japan. All sleeping groups, defined as a cluster in which individuals huddle at sleeping sites, were formed on the ground. Their sizes tended to increase when the temperature was lower. The number of adults with mutual physical contact in sleeping groups increased when the size of sleeping groups increased. These results suggest that the physiological function of huddling is protection from low temperatures, and that macaques select the ground as sleeping sites to form large sized groups. Huddling was performed most frequently among kin dyads. Non-related dyads which appeared to be affiliative in the daytime also huddled frequently at sleeping sites. Even non-related dyads which showed affiliative behavior less frequently in the daytime exhibited huddling, at night, however, they did so less often than those of kin dyads and affiliated dyads. It appears that huddling at night by pairs that did not normally affiliate in the daytime was made possible by the increased tolerance of individuals responding to colder temperatures at night in winter. Furthermore, huddling, grooming, and proximity were exhibited at greater frequency between kin dyads, and between high-ranking males and specific females of kin groups, although the dyads of individuals older than 15 years often were involved only in huddling. These results suggest that two types of social bonds exist at sleeping sites in winter. One is the social bond common to both the daytime and nighttime, the other is peculiar to nighttime. Consequently, the social function of huddling is that, troop integration might increase at sleeping sites in winter as close social relationships among adults are extended more widely than those in daytime.
Starting Page	57
Ending Page	68
Page Count	12
File Format	PDF
ISSN	00328332
Journal	Primates
Volume Number	38
Issue Number	1
e-ISSN	16107365
Language	English
Publisher	Springer-Verlag
Publisher Date	1997-01-01
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Macaca fuscata Huddling Sleeping group Winter Cool temperature zone Behavioural Sciences Animal Ecology Evolutionary Biology Zoology
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology

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