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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 (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 25 October 2021

The ecology of female reproduction in wild orangutans

The ecology of female reproduction in wild orangutans

(p.171) CHAPTER 11 The ecology of female reproduction in wild orangutans

Cheryl D. Knott

Melissa Emery Thompson

Serge A. Wich

Oxford University Press

Orangutans have the longest interbirth interval of any mammal, with existing data suggesting that these intervals may be significantly longer in Sumatra than in Borneo. This finding presents a paradox because our models of reproductive ecology suggest that the higher habitat quality of Sumatra should lead to shorter interbirth intervals. This chapter explores this intriguing difference between Sumatran and Bornean orangutans by detailing the available evidence on how orangutan reproduction is influenced by ecology and life history. Data are evaluated in light of the models, mechanisms and hypotheses by which energetics influence reproduction in apes and humans. The chapter makes recommendations for future research that will lead to a more thorough understanding of orangutan reproductive ecology. New hypotheses about acute vs cumulative effects of energy on ovarian function, the magnitude of the shift in energy intake, and the role of developmental plasticity in orangutan reproductive functioning are also presented.

Keywords:   reproductive ecology, interbirth interval, life history, C-peptide, development, energetics, nutrition, energy expenditure

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