Abstract
Cheek pouches, one of the distinguishing characters of the Cercopithecinae, are structures used for the temporary storage of food. Their size and frequency of use within a given species are related primarily to the amount of conspecific competition for food. In relation to total body size, members of the genusPapio are considered to have relatively small cheek pouches which are said to be used only occasionally to maximize food harvest when local clusters of food are encountered.
This investigation represents 165 hours of observation on a troop ofPapio ursinus at Mkuzi Game Reserve in Natal, South Africa. At the time of observation the choice of foods in the home range was restricted and usually found in abundance only in small clusters of trees. Given that conspecific competition would have been pronounced under these conditions, it was thought that any differences in the frequency of cheek pouch use related to age, sex, rank, or the reproductive state of an animal would be readily recognizable.
The results indicated that cheek pouches were used differentially throughout the day, with virtually all ages of each sex displaying the same general pattern of maximal cheek pouch use during the middle of the day. In each sex there was an age graded diminution of the frequency of cheek pouch use from juveniles to adults. This trend was more pronounced in males resulting in a substantial sex difference in the use of cheek pouches between adult males and females. In addition, there was some indication that differences in the frequency of cheek pouch use between adult males were correlated with rank. Although a pattern of cheek pouch use and rank was not evident amongst adult females, there was an association between reproductive state and the frequency of cheek pouch use. Overall, body size, dominance, and energetic demands appeared to be the most significant factors underlying the differences in cheek pouch use in this troop.
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Hayes, V.J., Henzi, S.P., Freedman, L. et al. The differential use of cheek pouches in a troop ofPapio ursinus . Primates 33, 477–500 (1992). https://doi.org/10.1007/BF02381151
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DOI: https://doi.org/10.1007/BF02381151