Journal
PRIMATES
Volume 58, Issue 1, Pages 225-235Publisher
SPRINGER JAPAN KK
DOI: 10.1007/s10329-016-0584-5
Keywords
Orangutans; Population estimate; Marked nest count; Seasonal movement
Categories
Funding
- 21st Century COE Program of the Tokyo Institute of Technology [R12, A10]
- JSPS Core-to-Core Program HOPE of PRIKU
- Global Environment Research Fund (GRASP)
- JSPS
- A. Advanced Research Networks International Network for Tropical Biodiversity Conservation focusing on the Studies on Large Animals of the Wildlife Research Center of Kyoto University
- JSPS Leading Graduate Program Primatology and Wildlife Science of Kyoto University
- Fujiwara Natural History Foundation
- Japanese Association of Zoos and Aquariums (JAZA)
- Mitsui Co., Ltd.
- [634]
- [40012]
- [20770195]
- [22687002]
- [25291100]
- [25257407]
- Grants-in-Aid for Scientific Research [13J40012] Funding Source: KAKEN
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We investigated the population density of Bornean orangutans (Pongo pygmaeus morio) and fruit availability for 10 years (2005-2014), in primary lowland dipterocarp forests in the Danum Valley, Sabah, Malaysia. During the research period, two mast fruitings and three other peak fruiting events of different scales occurred in the study area. The orangutan population density, estimated every 2 months by the marked nest count method, changed between 0.3 and 4.4 ind/km(2) and the mean population density was 1.3 ind/km(2) +/- SE 0.1 (n = 56). The population density increased markedly during mast and peak fruiting periods. A significant positive correlation was observed between the population density and fruit availability in the study period (Spearman, R = 0.3, P < 0.01, n = 56). During non-fruiting periods, however, no significant correlation was observed between them. These results suggest that the spatial difference in fruit availability during mast and peak fruiting periods was larger than during non-fruiting periods, and many orangutans temporarily moved to the study site from the surrounding areas seeking fruit.
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