Abstract. Sherman J, Ancrenaz M, Voigt M, Oram F, Santika T, Wich S, Meijaard E. 2020. Envisioning a future for Bornean orangutans: Conservation impacts of action plan implementation and recommendations for improved population outcomes. Biodiversitas 21: 465-477. Populations of the Critically Endangered Bornean orangutan (Pongo pygmaeus) are declining despite more than 10 years of conservation action plan implementation. Here we analyzed the impacts on species' population and habitat from orangutan conservation strategies implemented between 2007 and 2017. We also assessed data on investments into orangutan conservation, orangutan population trends and landcover change in orangutan range between 2007 and 2017. Diverse strategies addressed the range of threats to orangutans but were not implemented at scales that impacted species’ level populations and habitats. Since 2007 orangutan populations and forests across orangutan range have declined, with orangutan killing and deforestation as the major drivers of loss. Protected areas have increased since 2007, notably in Malaysian range states and in Central Kalimantan, Indonesia. However, 80% or tens of thousands of orangutans live outside protected areas in Kalimantan alone. Our results underscore scientific findings that have demonstrated this species’ resiliency and modified previous understanding of their habitat use. Orangutans are regularly found using agriculture landscapes (acacia, oil palm, and timber plantations), and exploited forests. This plasticity must be considered to design more effective orangutan conservation strategies. We need to revise the notion of “orangutan habitat” to extend beyond forests alone, incorporating all landscapes where P. pygmaeus can be found. Orangutans cannot survive in exclusively monoculture production areas; they need some natural forest to fulfill their ecological requirements. However, individuals surviving in isolated forest patches or mosaic landscapes play an important role in sustaining the long-term viability of the local metapopulation through provision of crucial genetic, reproductive and socioecological connectivity. Our findings suggest removing these individuals through translocations weakens overall metapopulation health. All necessary efforts must be made to maintain individuals in isolated forest patches or mosaic landscapes in order to support healthy metapopulations. Improved orangutan population outcomes will require addressing habitat connectivity at the landscape level, incorporating both non-forested and anthropogenically modified areas, and developing efficient management strategies for human and orangutan co-existence within these multiple-use landscapes.
Abram NK, et al. 2015. Mapping perceptions of species' threats and population trends to inform conservation efforts: the Bornean orangutan case study. Diversity and Distributions 21:487-499.
Ancrenaz M, Gumal M, Marshall AJ, Meijaard E, Wich SA, Husson S. 2016. Pongo pygmaeus. The IUCN Red List of Threatened Species 2016:e.T17975A17966347.
Ancrenaz M, Oram F, Ambu L, Lackman I, Ahmad E, Elahan H, Meijaard E. 2015. Of pongo, palms, and perceptions – A multidisciplinary assessment of orangutans in an oil palm context. Oryx 49:465–472.
Barclay H, Gray C, Luke S, Nainar A, Snaddon J, Turner E. 2018. RSPO Manual on Best Management Practices (BMPs) for the Management and Rehabilitation of Riparian Reserves. https://www.rspo.org/resources/conservation-sustainable-management-of-natural-resources/best-management-practices-for-riparian-areas.
Beck BB, Walkup K, Rodriques M, Unwin S, Travis D, Stoinski T 2007. Best practices guidelines for the re-introduction of great apes. SSC Primate Specialist Group of the World Conservation Union, Gland, Switzerland.
Bernard H, Baking EL, Giordano AJ, Wearn OR, Ahmad AH. 2014. Terrestrial Mammal Species Richness and Composition in Three Small Forest Patches within an Oil Palm Landscape in Sabah, Malaysian Borneo. Mammal Study 39:141-154.
CITES/GRASP. 2006. CITES/GRASP Orang-utan Technical Mission Indonesia Geneva, Switzerland.
Davis JT, Mengersen K, Abram N, Ancrenaz M, Wells J, Meijaard E. 2013. It’s not just conflict that motivates killing of orangutans. PLoS ONE 8: e75373.
De Telegraaf. 1934. Kolonië. Palmoliecultuur Nederl. Indië. De Telegraaf - Avondblad, 17 October 1934. https://www.delpher.nl/nl/kranten/view?query=orang-oetan+AND+dood&coll=ddd&identifier=ddd%3A110572386%3Ampeg21%3Aa0310&resultsidentifier=ddd%3A110572386%3Ampeg21%3Aa0310.
ESRI. 2014. ArcGIS Desktop: Release 10. Redlands, CA, USA.
Freund C, Rahman E, Knott C. 2017. Ten years of orangutan-related wildlife crime investigation in West Kalimantan, Indonesia. American Journal of Primatology 79.
FSC. 2009. FSC step-by-step guide. http://ic.fsc.org/file-download.fsc-step-by-step-pocket-guide.16.htm.
GADM. 2012. Global Administrative Areas database, Available from https://gadm.org/ (accessed October 2018).
Gaveau DLA, et al. 2013. Reconciling forest conservation and logging in Indonesian Borneo. PLoS ONE 8:e69887.
Gaveau DLA, Salim M, Arjasakusuma S. 2016. Deforestation and industrial plantations development in Borneo. Center for International Forestry Research (CIFOR).
IUCN/SSC. 2013. Guidelines for Reintroductions and Other Conservation Translocations. Version 1.0.
Karokaro AS, Hanafiah J. 2019. Indonesia rescues captive orangutans, but leaves their owners untouched. Mongabay, February 8 2019. https://news.mongabay.com/2019/02/indonesia-rescues-captive-orangutans-but-leaves-their-owners-untouched/.
Lammertink M. 2004. A multiple-site comparison of woodpecker communities in bornean lowland and hill forests. Conservation Biology 18:746-757.
Lucey JM, Tawatao N, Senior MJM, Chey VK, Benedick S, Hamer KC, Woodcock P, Newton RJ, Bottrell SH, Hill JK. 2014. Tropical forest fragments contribute to species richness in adjacent oil palm plantations. Biological Conservation 169:268-276.
Meijaard E, et al. 2011. Quantifying killing of orangutans and human-orangutan conflict in Kalimantan, Indonesia PLoS ONE 6:e27491.
Meijaard E, Morgans C, Husnayaen, Abram NK, Ancrenaz M. 2017. An impact analysis of RSPO certification on Borneo forest cover and orangutan populations. Brunei Darussalam.
Meijaard E, Sherman J, Ancrenaz M, Wich SA, Santika T, Voigt M. 2018. Orangutan populations are certainly not increasing in the wild. Current Biology 28:R1241-R1242.
Mitchell SL, Edwards DP, Bernard H, Coomes D, Jucker T, Davies ZG, Struebig MJ. 2018. Riparian reserves help protect forest bird communities in oil palm dominated landscapes. Journal of Applied Ecology 55:2744-2755.
MOEF. 2018. 2018. The State of Indonesia’s Forests 2018. Jakarta: Ministry of Environment and Forestry, Republic of Indonesia.
Naylor RL, Higgins MM, Edwards RB, Falcon WP. 2019. Decentralization and the environment: Assessing smallholder oil palm development in Indonesia. Ambio 48:1195-1208.
Nijman V. 2017. Orangutan trade, confiscations, and lack of prosecutions in Indonesia. American Journal of Primatology 79.
Oliphant T. 2016. Guide to NumPy.
Pandong J, Gumal M, Aton ZM, Sabki MS, Koh LP. 2019. Threats and lessons learned from past orangutan conservation strategies in Sarawak, Malaysia. Biological Conservation 234:56-63.
ProKal. 2017. Orangutan yang Masuki Kebun Warga Kembali Dilepasliarkan ProKalteng, August 13. http://kalteng.prokal.co/read/news/41643-orangutan-yang-masuki-kebun-warga-kembali-dilepasliarkan.html.
R Core Development Team. 2016. R: A language and environment for statistical computing. R Foundation for Statistical Computing. http://www.R-project.org/. Vienna, Austria.
Republic of Indonesia. 2011. Peraturan Pemerintah Republik Indonesia Nomor 38 Tahun 2011 tentang Sungai (pp. Pasal 10, Ayat 11). Government of the Republic of Indonesia, Jakarta, Indonesia.
RSPO. 2018. Principles and Criteria for the Production of Sustainable Palm Oil 2018. http://www.cmzoo.org/docs/RSPO-PC11-15-2018-Principles-Criteria.pdf.
Sabah Water Resources Enactment. 1998. Sabah Water Resources Enactment in Sabah So, editor.
Santika T, et al. 2017. First integrative trend analysis for a great ape species in Borneo. Scientific Reports 7:4839.
Santika T, Meijaard E, Wilson KA. 2015. Designing multifunctional landscapes for forest conservation. Environmental Research Letters 10:114012.
Sherman J, Greer D. 2018. The Status of Captive Apes: Beyond Capacity: Sanctuaries and the Status of Captive Apes in Shrinking Natural Habitats. Pages 224-255 in Arcus Foundation, editor. State of the Apes: Infrastructure Development and Ape Conservation. Cambridge University Press, Cambridge, UK.
Simon D, Davies G, Ancrenaz M. 2019. Changes to Sabah’s orangutan population in recent times: 2002–2017. PLoS ONE 14:e0218819.
Spehar SN, Rayadin Y. 2017. Habitat use of Bornean Orangutans (Pongo pygmaeus morio) in an Industrial Forestry Plantation in East Kalimantan, Indonesia. International Journal of Primatology:1-27.
Sudrajat, Putro M. 2019. The contribution of forest remnants within industrial area to threatened mammal conservation: A case study in liquefied natural gas industry in Bontang, Indonesia. Biodiversitas 20:2257-2265.
Utami-Atmoko et al. 2017. Orangutan Population and Habitat Viability Assessment: Final Report (draft version). Apple Valley, MN.
Wells JA, Wilson KA, Abram NK, Nunn M, Gaveau DLA, Runting RK, Tarniati N, Mengersen KL, Meijaard E. 2016. Rising floodwaters: mapping impacts and perceptions of flooding in Borneo. Environmental Research Letters 11:064016.