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Acknowledgments
We would like to express our gratitude to the Indonesian Government and the Department of Conservation for collaboration with PanEco and Yayasan Ekosistem Lestari, and the Government of North Tapanuli for granting permission to establish a research station in the Batang Toru forest. Han de Vries and Jan Gogarten are thanked for their advice on statistical analyses. We would like to thank Bapak Jonotoro and Bapak Naryo from the Balai Diklat Kehutanan Pekanbaru for identification of trees in the phenology plots. We would also like to thank our field assistants Kalam, Buyung, Iman, Con, and Ulil for their assistance in the forest, and Gregoire Bertagnolio for all his help in the field. BOS Netherlands, the Durrell Wildlife Conservation Trust, US Fish and Wildlife Service, the Great Ape Trust in Iowa, the NVD (Dutch Foundation Zoo’s Help), and the Ouwehands Zoo Foundation in the Netherlands are thanked for their financial support for the project.
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Wich, S.A., Usher, G., Peters, H.H., Khakim, M.F.R., Nowak, M.G., Fredriksson, G.M. (2014). Preliminary Data on the Highland Sumatran Orangutans (Pongo abelii) of Batang Toru. In: Grow, N., Gursky-Doyen, S., Krzton, A. (eds) High Altitude Primates. Developments in Primatology: Progress and Prospects. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8175-1_15
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