Document Detail


The development of wild immature Sumatran orangutans (Pongo abelii) at Ketambe.
MedLine Citation:
PMID:  16670816     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Orangutans have the longest immature period and inter-birth interval of all ape species. This may be explained by a slow life history, the need to develop skills or by their relatively solitary lifestyle, which prevents a mother from associating with two offspring. This study of wild immature orangutans at the Ketambe Research Station, Indonesia, describes, with partly cross-sectional, partly longitudinal data, their development to independence. The study subjects ranged from 1 to 11 years of age. Data on their activity budget, diet, mother-offspring proximity and maintenance of proximity, association with conspecifics and play behavior were collected. The results indicate that immature orangutans can provide for their own food and transport, and therefore were independent of direct maternal care, at an age of possibly 3 but more clearly 6 years. This is similar to chimpanzees, and refutes the slow life history hypothesis. Immature orangutans remain within their mother's vicinity until the age of 8 years, indicating a dependence on indirect maternal care, and this coincides with the period during which the mother does not produce another offspring. A female orangutan seems unable to associate with an older immature while caring for a new infant. This is consistent with the solitary-lifestyle hypothesis and corroborates the results obtained with the Sumatran orangutan population at Suaq Balimbing. However, why an immature depends indirectly on its mother for such a long period remains unclear. It is possible that it needs to develop ecological or social skills or needs the protection of its mother. Unfortunately, no data were available to distinguish between these possibilities.
Authors:
Gijsbertus G J van Adrichem; Sri Suci Utami; Serge A Wich; Jan A R A M van Hooff; Elisabeth H M Sterck
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-05-03
Journal Detail:
Title:  Primates; journal of primatology     Volume:  47     ISSN:  0032-8332     ISO Abbreviation:  Primates     Publication Date:  2006 Oct 
Date Detail:
Created Date:  2006-12-05     Completed Date:  2007-01-30     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401152     Medline TA:  Primates     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  300-9     Citation Subset:  IM    
Affiliation:
Behavioural Biology, Utrecht University, P.O. Box 80086, 3508 TB, Utrecht, The Netherlands.
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MeSH Terms
Descriptor/Qualifier:
Age Factors
Animals
Animals, Wild
Behavior, Animal*
Feeding Behavior
Female
Hominidae / growth & development*,  psychology*
Indonesia
Male
Mothers
Motor Activity
Play and Playthings
Social Behavior

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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