International Journal of Primatology

, Volume 27, Issue 6, pp 1535–1550

Dietary and Energetic Responses of Pongo abelii to Fruit Availability Fluctuations


    • Behaviroural Biology DepartmentUtrecht, University
    • Great Ape Trust of Iowa
  • S. S. Utami-Atmoko
    • Universitas Nasional
  • T. Mitra Setia
    • Universitas Nasional
  • S. Djoyosudharmo
    • Taman Nasional Gunung Leuser
  • M. L. Geurts
    • Behaviroural Biology DepartmentUtrecht, University
    • Great Ape Trust of Iowa

DOI: 10.1007/s10764-006-9093-5

Cite this article as:
Wich, S.A., Utami-Atmoko, S.S., Mitra Setia, T. et al. Int J Primatol (2006) 27: 1535. doi:10.1007/s10764-006-9093-5

Like many primates, orangutans face fluctuations in fruit availability. We show that in Ketambe (Sumatra), fruit availability fluctuations have very little influence on orangutan diet. Most importantly, the percentages of fruits including figs, fruits excluding figs, and figs in their diet do not differ significantly between periods of varying fruit availability. In addition, there is no trace of ketones in orangutan urine samples during periods of varying fruit availability. Unlike 1 orangutan population in Borneo, orangutans in Sumatra experience no prolonged negative energy budget because of fluctuations in fruit availability. Dietary data from other Sumatran and Bornean orangutan populations indicate that the pattern might be representative for a more general difference between Sumatra and Borneo, and we discuss how this might have affected orangutan reproduction and life history for the 2 species.



Copyright information

© Springer Science+Business Media, LLC 2006