About the Authors

Erik Meijaard


Affiliations People and Nature Consulting International, Jakarta, Indonesia, School of Archaeology and Anthropology, Australian National University, Canberra, Australian Capital Territory, Australia

Guillaume Albar

Affiliation Société d'Ornithologie de Polynésie, Taravao, Tahiti, French Polynesia


Affiliation The Nature Conservancy-Indonesia Program, Balikpapan, East Kalimantan, Indonesia

Yaya Rayadin

Affiliations Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan, Forestry Faculty, Mulawarman University, Samarinda, East Kalimantan, Indonesia

Marc Ancrenaz

Affiliation Hutan, Sandakan, Malaysia

Stephanie Spehar

Affiliation Department of Religious Studies and Anthropology, University of Wisconsin, Oshkosh, Wisconsin, United States of America

Competing Interests

Erik Meijaard is presently employed by People and Nature Consulting International (PNCI), but was not working for them at the time the study was conducted. The work that went into analyzing and writing up the results of this study was unpaid. PNCI had no role in the study. The affiliation with PNCI does not alter Erik Meijaard's adherence to all the PLoS ONE policies on sharing data and materials. Erik Meijaard conducted consultancy work for a plantation company (Asia Pulp and Paper-APP) which is closely affiliated with the company that owns one of the two plantation areas in which the study was originally conducted (Sinar Mas Forestry). This work was done from January–March 2010, i.e., two years after the field work for the present study. Erik Meijaard's role was to contribute to the forest technical section of that report, with a focus on plantations in Riau and Jambi Province, not in East Kalimantan. APP/Sinas Mas Forestry have had no role or influenced in any way the analysis or write up of the results of the study. This is a pure applied conservation study without any conflicting financial interest.

Author Contributions

Conceived and designed the experiments: EM MA. Performed the experiments: GA N. Analyzed the data: EM GA YR MA SS. Contributed reagents/materials/analysis tools: SS. Wrote the paper: EM GA YR MA SS.