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Orangutan activity budgets and diet

Helen C. Morrogh-Bernard, Simon J. Husson, Cheryl D. Knott, Serge A. Wich, Carel P. van Schaik, Maria A. van Noordwijk, Isabelle Lackman-Ancrenaz, Andrew J. Marshall, Tomoko Kanamori, Noko Kuze and Ramlan bin Sakong

in Orangutans

Published in print December 2008 | ISBN: 9780199213276
Published online May 2009 | e-ISBN: 9780191707568 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780199213276.003.0008
 Orangutan activity budgets and diet

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The chapter examines differences in the activity budgets of wild orangutans (Pongo spp.) within and between a large number of study sites in Sumatra and Borneo. The authors of the chapter found that each orangutan population appeared to follow one of two distinct foraging strategies: either (1) ‘sit and wait’, in which orangutans aim to minimize their energy expenditure by spending long periods of time resting and relatively short periods feeding and travelling; or (2) ‘search and find’ in which orangutans aim to maximize their energy intake by resting little and mainly feeding or moving in search of food. Orangutans adopt the first strategy in mixed-dipterocarp forests characterized by mast-fruiting events and irregular fruit availability; and adopt the second strategy in swamp forests with a regular supply of fruit, or in dryland forests with high strangling-fig density. The chapter proposes that the determining factor for which strategy is adopted is the temporal availability of fruit in the habitat, as opposed to other possibilities such as orangutan taxonomy.

Keywords: activity budget; orangutan; diet; search and find; sit and wait; fruit availability; mixed-dipterocarp forests; resting; taxonomy

Chapter.  8444 words.  Illustrated.

Subjects: Zoology and Animal Sciences

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