The effects of forest phenology and floristics on populations of Bornean and Sumatran orangutans

Andrew J. Marshall, Marc Ancrenaz, Francis Q. Brearley, Gabriella M. Fredriksson, Nilofer Ghaffar, Matt Heydon, Simon J. Husson, Mark Leighton, Kim R. McConkey, Helen C. Morrogh-Bernard, John Proctor, Carel P. van Schaik, Carey P. Yeager and Serge A. Wich

in Orangutans

Published in print December 2008 | ISBN: 9780199213276
Published online May 2009 | e-ISBN: 9780191707568 | DOI:
 The effects of forest phenology and floristics on populations of Bornean and Sumatran orangutans

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It has long been assumed that Sumatran forests are of higher quality for orangutans than Bornean forests, and that this is both the proximate and ultimate cause of many of the differences in socio-ecology between the two orangutan species. Yet this hypothesis has remained untested. This chapter presents data on the phenology and floristics of eight Bornean and three Sumatran forest sites where orangutans have been studied to examine the effects of floristic composition, habitat productivity, and seasonality on orangutan population density. The alternative hypotheses that higher orangutan densities in Sumatra are due to overall higher levels of plant productivity, the increased availability of preferred foods, the presence of more fallback foods, or differences in floristic composition between the two islands are tested empirically.

Keywords: forest phenology; floristics; habitat productivity; preferred foods; fallback foods; orangutans

Chapter.  12051 words.  Illustrated.

Subjects: Zoology and Animal Sciences

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