NDLI: Reproductive parameters of female orangutans (Pongo pygmaeus wurmbii) 1971–2011, a 40-year study at Tanjung Puting National Park, Central Kalimantan, Indonesia

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Reproductive parameters of female orangutans (Pongo pygmaeus wurmbii) 1971–2011, a 40-year study at Tanjung Puting National Park, Central Kalimantan, Indonesia

Content Provider	Springer Nature Link
Author	Galdikas, Biruté Mary Ashbury, Alison
Copyright Year	2012
Abstract	This study presents reproductive parameter data gathered by direct observation over a 40-year period (1971–2011) of the provisioned free-ranging population of orangutans at Camp Leakey in Tanjung Puting National Park, Central Kalimantan, Indonesia. Age at first reproduction, interbirth interval (IBI), sex ratio at birth, and infant mortality for 19 female orangutans (11 first-generation wild-born ex-captive mothers and 8 second-generation mothers) are included in this analysis. Age at first reproduction among the first-generation mothers was similar to that among wild orangutans, while second-generation mothers had a significantly earlier age at first reproduction. IBIs were similar among first- and second-generation mothers and were significantly shorter than those recorded in studies of wild orangutan populations. There was an expected male-biased sex ratio at birth and a slightly higher than expected rate of infant mortality when compared to wild populations. Infant mortality was primarily seen among second-generation mothers who gave birth before the age of 12, and among first births of some first-generation mothers. These results lend support to the ecological energetics hypothesis, which predicts that increased diet quality leads to a faster rate of reproduction.
Starting Page	61
Ending Page	72
Page Count	12
File Format	PDF
ISSN	00328332
Journal	Primates
Volume Number	54
Issue Number	1
e-ISSN	16107365
Language	English
Publisher	Springer Japan
Publisher Date	2012-10-04
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Orangutans Life history Reproductive parameters Interbirth interval Rehabilitation Mortality rates Age at first reproduction Zoology Animal Ecology Behavioural Sciences Evolutionary Biology
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology

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