Pithecia pithecia's behavioral response to decreasing fruit abundance.
In this article we describe the behavioral responses of a group of white-faced sakis' (Pithecia pithecia) to fruit and water scarcity. Six sakis were observed on Round Island in Guri Lake, Venezuela, between March and May 1996. These months are considered the dry season and the beginning of the wet season. Sakis specialize in eating seeds. During the present study only one tree species, Licania discolor (Chrysobalanaceae), fruited in substantial numbers. Licania seeds accounted for 88% of the time the sakis spent eating fruit in March, 87% in April, and 80% in May. We estimate that the sakis' intake of Licania seeds dropped from 2,573 seeds in the 15-day observation period in March to 956 seeds in the 16-day observation period in May. The sakis not only spent less time eating Licania, they ate the seeds at a much slower rate. The drop in the sakis' feeding rate was probably due to increased local search and inspection times. In response to the scarcity of fruit, the sakis ate more young leaves, insects, and flowers. Feeding bouts became more frequent but shorter. Mean distances between feeding bouts fell significantly and the sakis revisited trees less often.
Cunningham
Elena P
EP
Department of Basic Sciences and Craniofacial Biology, New York University College of Dentistry, New York, New York 10010-4086, USA. ec46@nyu.edu
Janson
Charles H
CH
D000704:Analysis of Variance; D000818:Animals; D045469:Chrysobalanaceae; D004032:Diet / Q000662:veterinary*; D005247:Feeding Behavior / Q000502:physiology / Q000523:psychology*; D005260:Female; D005523:Food Supply; D005638:Fruit; D008297:Male; D010944:Plants; D051078:Platyrrhini / Q000502:physiology / Q000523:psychology*; D012639:Seeds; D013997:Time Factors