A comparison of orang-utan density in a logged and unlogged forest on Sumatra

Biological Conservation

Volumn 120, Issue 2, 2004, Pages 183-188

  Knop, Eva ^a,b   Ward, Paul I ^a   Wich, Serge A ^c  

^a UNIVERSITY OF ZURICH   (Switzerland)

^b Eidg Forschungsanstalt fur Agrarokologie und Landbau   (Switzerland)

^c UTRECHT UNIVERSITY   (Netherlands)

Author keywords

Density; Food attraction hypothesis; Fruit availability; Orang utan; Seasonal movements; Selective logging; Sumatra

Indexed keywords

FOOD AVAILABILITY; LOGGING (TIMBER); MOBILITY; PRIMATE; SEASONAL VARIATION;

ASIA; EURASIA; GREATER SUNDA ISLANDS; MALAY ARCHIPELAGO; SOUTHEAST ASIA; SUMATRA; SUNDA ISLES;

PONGO PYGMAEUS;

EID: 3543060111     PISSN: 00063207     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.biocon.2004.02.010     Document Type: Article

References (34)

1. Abdulhadi, R., Mirmanto, E., Kartawinata, K., 1987. A lowland dipterocarp forest in Sekundur, North Sumatra, Indonesia: five years after mechanized logging. In: Kostermans, A.H. (Ed.), Proceedings of the Third Round Table Conference on Dipterocarps, UNESCO, Jakarta, Indonesia, pp. 255-273
2. Blouch R.A. Orangutans. Densities and Distributions of Primates in the Lanjak Entimau Wildlife Sanctuary and Recommendations for Sanctuary Management. 1994;20-26 International Tropical Timber Organization Unit, Sarawak, Malaysia
3. Brockelman W.Y. Study of tropical forest canopy height and cover using a point intercept method. Forest Biodiversity Research, Monitoring and Modelling: Conceptual Background and Old Case Studies. 1998;521-531 Paris and Parthenon Publishing, New York
4. Buckland S.T., Anderson D.R., Burnham K.P., Laake J.L. Distance Sampling. Estimating Abundance of Biological Populations. 1993;Chapman and Hall, London
5. Buij R., Wich S.A., Lubis A.H., Sterck E.H.M. Seasonal movements in the Sumatran orang-utan (Pongo pygmaeus abelii) and consequences for conservation. Biological Conservation. 107:2002;83-87
6. Buij R., Singleton I., Krakauer E., van Schaik C.P. Rapid assessment of orang-utan density. Biological Conservation. 2003
7. Burnham K.P., Anderson D.R., Laake J.L. Estimation of density from line transect sampling of biological populations. Wildlife Monographs. 72:1980;202
8. Cannon C.H., Peart D.R., Leighton D.R., Kartawinata K. The structure of lowland rainforest after selective logging in West Kalimantan, Indonesia. Forest Ecology and Managament. 67:1994;49-68
9. de Wilde W.O., Duyfjes B.E. Vegetation, floristic and plant biogeography in Gunung Leuser National Park. Schaik C.P.v., Supriatna J. Leuser, a Sumatran Sanctuary. 1996;49-103 Yayasan Bina Saina Hayati Indonesia, Depok, Indonesia
10. Djojosudharmo S., Schaik C.P.v. Why are orang-utans so rare in the highlands? Tropical Biodiversity. 1:1992;11-22
11. Engström, L., 2000. Effects of selective hand - logging on oran-gutan habitat quality and population density in Gunung Palung National Park, Borneo, Indonesia; with focus on forest structure and nest resources
12. Galdikas B.M.F. Orang-utan diet, range and activity in Tanjung Puting, Central Borneo. International Journal of Primatology. 9:1988;1-31
13. Grieser Johns A., Grieser Johns B. Tropical forest primates and logging: long-term co-existence? Oryx. 29:1995;205-211
14. Hilton-Taylor, C., Brackett, D., 2000. IUCN red list of threatened species IUCN, Gland
15. Johns A.D. Forest disturbance and Amazonian primates. Box H.O. Primate Responses to Environmental Change. 1991;Chapman and Hall, London
16. Knott C.D. Changes in orang-utan caloric intake, energy balance, and ketones in response to fluctuating fruit availability. International Journal of Primatology. 19:1998;1061-1078
17. Levene H. In Contributions to Probability and Statistics. 1960;Standford University Press, Standford, CA. p. 278
18. MacKinnon J. The future of orang-utans. New Scientist. 74:1977;697-699
19. Payne J. Surveying orang-utan populations by counting nests from a helicopter: a pilot study in Sabah. Primate Conservation. 8:1987;92-103
20. Rao M., van Schaik C.P. The behavioral ecology of Sumateran orang-utans in logged and unlogged forest. Tropical Biodiversity. 4:1997;173-185
21. Rijksen H.D. A Field Study on Sumatran Orang-utans (Pongo pygmaeus abelii Lesson 1872). 1978;H. Veenman and Zonen B.V., Wageningen
22. Rijksen H.D., Meijaard E. Our Vanishing Relative: The Status of Wild Orang-utans At the Close of the Twentieth Century. 1999;Kluwer Academic Publishers, Dordrecht
23. Robertson J.Y., van Schaik C.P. Causal factors underlying the dramatic decline of the Sumatran orang-utan. Oryx. 35:2001;26-38
24. Rodman P.S. Diversity and consistency in ecology and behaviour. Schwartz J.H. Orang-utan Biology. 1988;31-51 Oxford University Press, New York
25. SPSS, 1999. SPSS Base System Users Guide [10], Chicago (Ref type: Computer program)
26. Struhsaker T.T. Ecology of an African Rainforest: Logging in Kibale and the Conflict Between Conservation and Exploitation. 1997;University Press of Florida, Gainesville
27. te Boekhorst I.A., Schurman C.L., Sugardjito J. Residental status and seasonal movements of wild orang-utans in the Gunung Leuser reserve (Sumatra, Indonesia). Animal Behaviour. 39:1990;1098-1109
28. Van Schaik C.P. Phenological changes in a Sumatran rainforest. Journal of Tropical Ecology. 2:1986;327-347
29. van Schaik, C.P., Azwar, 1991. Orang-utan densities in different forest types in the Gunung Leuser National Park (Sumatra), as determined by nest counts. In: Report to PHPA, LIPI and L.S.B. Leakey Foundation, Durham, NC, USA
30. van Schaik C.P., Azwar, Priatna D. Population estimates and habitat preferences of orang-utans based of line transects of nests. Nadler R.D. The Neglected Ape. 1995;129-147 Plenum Press, New York
31. Van Schaik C.P., Monk K.A., Robertson J.Y. Dramatic decline in orang-utan numbers in the Leuser Ecosystem, northern Sumatra. Oryx. 35:2001;14-25
32. Wheatly B.P. Energetics of foraging in Macaca fascicularis and Pongo pygmaeus and a selective advantage of large body size in the orang-utan. Primates. 23:1982;348-363
33. Wich S.A., Van Schaik C.P. The impact of El Ni∼no on mast fruiting in Sumatra and elsewhere in Malesia. Journal of Tropical Ecology. 16:2000;563-577
34. Wich S.A., Singleton I., Utami-Atmoko S.S., Geurts M.L., Rijksen H.D., van Schaik C.P. The status of the Sumatran Orang-utan Pongo abelii: an update. Oryx. 37:2003;49-54