Abstract
Understanding of animal responses to dynamic resource landscapes is based largely on research on temperate species with small body sizes and fast life histories. We studied a large, tropical mammal with an extremely slow life history, the Western Bornean orangutan (Pongo pygmaeus wurmbii), across a heterogeneous natural landscape encompassing seven distinct forest types. Our goals were to characterize fluctuations in abundance, test hypotheses regarding the relationship between dispersion dynamics and resource availability, and evaluate how movement patterns are influenced by abiotic conditions. We surveyed abundance in Gunung Palung National Park, West Kalimantan, Indonesia, for 99 consecutive months and simultaneously recorded weather data and assessed fruit availability. We developed a Bayesian hierarchical distance sampling model to estimate population dispersion and assess the roles of fruit availability, rainfall, and temperature in driving movement patterns across this heterogeneous landscape. Orangutan abundance varied dramatically over space and time. Each forest type was important in sustaining more than 40% of the total orangutans on site during at least one month, as animals moved to track asynchronies in fruiting phenology. We conclude that landscape-level movements buffer orangutans against fruit scarcity, peat swamps are crucial fallback habitats, and orangutans’ use of high elevation forests is strongly dependent on abiotic conditions. Our results show that orangutans can periodically occupy putative-sink habitats and be virtually absent for extended periods from habitats that are vitally important in sustaining their population, highlighting the need for long-term studies and potential risks in interpreting occurrence or abundance measures as indicators of habitat importance.
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Data availability
All data necessary to reproduce our results are available at figshare.com: DOI m10.6084/m9.figshare.14731866.
Code availability
All code necessary to reproduce our results are available at figshare.com https://doi.org/10.6084/m9.figshare.14731890
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Acknowledgements
We gratefully acknowledge the many constructive comments provided by the handling editor and three reviewers. We thank field researchers Agus Trianto, Albani, M. Ali A. K., Busran A. D., Dika, John Harting, Sarah Jaffe, Lande, Sylvain Lemoine, Mi’an, Edward Tang, Jon Sweeney, Surya, and Zakaria. Our thanks to AJM’s Indonesian counterparts and supporting institutions: the Ministry of Research and Technology / National Research and Innovation Agency, the Ministry of Forestry’s Directorate General of Forest Protection and Nature Conservation, the Indonesian Institute of Sciences, Universitas Nasional, Universitas Tanjungpura, and the Gunung Palung National Park Bureau.
Funding
Our work at Gunung Palung has been supported by funding from University of California, Davis, University of Michigan, Victoria University of Wellington, the Chinese Academy of Sciences, Xishuangbanna Tropical Botanical Garden, Hellman Foundation, Leakey Foundation, Orangutan Conservancy, Fulbright Foundation, Mohamed bin Zayed Species Conservation Fund, and the AZA Ape TAG Initiative.
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AJM, ML, LB, KLF, and HUW designed the study. AJM and HUW raised funds for data collection; AJM, LGB, ES, TWS, and TMS collected the data and/or provided logistical support; LB, KLF, LGB, MTF, and AJM extracted data and contributed R code; MTF and EFZ developed the Bayesian hierarchical distance sampling model; AJM and HUW wrote the manuscript; AJM produced the figures. All authors contributed to the drafts and gave final approval for publication.
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Communicated by Joanna E. Lambert.
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Marshall, A.J., Farr, M.T., Beaudrot, L. et al. Biotic and abiotic drivers of dispersion dynamics in a large-bodied tropical vertebrate, the Western Bornean orangutan. Oecologia 196, 707–721 (2021). https://doi.org/10.1007/s00442-021-04964-1
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DOI: https://doi.org/10.1007/s00442-021-04964-1