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OrangutansGeographic Variation in Behavioral Ecology and Conservation$
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Serge A. Wich, S Suci Utami Atmoko, Tatang Mitra Setia, and Carel P. van Schaik

Print publication date: 2008

Print ISBN-13: 9780199213276

Published to Oxford Scholarship Online: May 2009

DOI: 10.1093/acprof:oso/9780199213276.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (www.oxfordscholarship.com). (c) Copyright Oxford University Press, 2019. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 14 December 2019

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

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

Are Sumatran forests better orangutan habitat than Bornean forests?

Chapter:
(p.97) CHAPTER 7 The effects of forest phenology and floristics on populations of Bornean and Sumatran orangutans
Source:
Orangutans
Author(s):

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

Serge A. Wich

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199213276.003.0007

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

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