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Orangutans Venture out of the Rainforest and Into the Anthropocene

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Orangutans Venture out of the Rainforest and Into the Anthropocene UvA-DARE (Digital Academic Repository) Orangutans venture out of the rainforest and into the anthropocene Spehar, S.N.; Sheil, D.; Harrison, T.; Louys, J.; Ancrenaz, M.; Marshall, A.J.; Wich, S.A.; Bruford, M.W.; Meijaard, E. DOI 10.1126/sciadv.1701422 Publication date 2018 Document Version Final published version Published in Science Advances License CC BY-NC Link to publication Citation for published version (APA): Spehar, S. N., Sheil, D., Harrison, T., Louys, J., Ancrenaz, M., Marshall, A. J., Wich, S. A., Bruford, M. W., & Meijaard, E. (2018). Orangutans venture out of the rainforest and into the anthropocene. Science Advances, 4(6), [e1701422]. https://doi.org/10.1126/sciadv.1701422 General rights It is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulations If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: https://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. UvA-DARE is a service provided by the library of the University of Amsterdam (https://dare.uva.nl) Download date:29 Sep 2021 SCIENCE ADVANCES | REVIEW EVOLUTIONARY BIOLOGY Copyright © 2018 The Authors, some rights reserved; Orangutans venture out of the rainforest and into exclusive licensee American Association the Anthropocene for the Advancement Stephanie N. Spehar1*, Douglas Sheil2, Terry Harrison3, Julien Louys4, Marc Ancrenaz5,6, of Science. No claim to 7 8,9 10 5,11 original U.S. Government Andrew J. Marshall , Serge A. Wich , Michael W. Bruford , Erik Meijaard Works. Distributed under a Creative Conservation benefits from understanding how adaptability and threat interact to determine a taxon’s vulnera- Commons Attribution bility. Recognizing how interactions with humans have shaped taxa such as the critically endangered orangutan NonCommercial (Pongo spp.) offers insights into this relationship. Orangutans are viewed as icons of wild nature, and most efforts License 4.0 (CC BY-NC). to prevent their extinction have focused on protecting minimally disturbed habitat, with limited success. We syn- thesize fossil, archeological, genetic, and behavioral evidence to demonstrate that at least 70,000 years of human influence have shaped orangutan distribution, abundance, and ecology and will likely continue to do so in the future. Our findings indicate that orangutans are vulnerable to hunting but appear flexible in response to some other human activities. This highlights the need for a multifaceted, landscape-level approach to orangutan con- servation that leverages sound policy and cooperation among government, private sector, and community stake- Downloaded from holders to prevent hunting, mitigate human-orangutan conflict, and preserve and reconnect remaining natural forests. Broad cooperation can be encouraged through incentives and strategies that focus on the common inter- ests and concerns of different stakeholders. Orangutans provide an illustrative example of how acknowledging the long and pervasive influence of humans can improve strategies to preserve biodiversity in the Anthropocene. INTRODUCTION search has also documented the orangutan’s flexibility in response to http://advances.sciencemag.org/ Humans have been described as the world’s greatest evolutionary human alteration of their habitat, with some populations living in pre- force (1). A long history of human hunting, habitat modification, viously logged forest (13, 14) and even persisting in human-dominated translocation, and domestication has shaped the distribution, abun- environments such as forestry and palm oil plantations and agrofor- dance, morphology, and behavior of most modern taxa (2, 3). Wide- estry landscapes, engaging in behaviors including feeding on crops spread Pleistocene extinctions and the current extinction crisis also and building nests in exotic trees, including oil palms (Fig. 1) (15–18). demonstrate that human activities threaten many species (4, 5). These Despite these observations, orangutans retain their status as symbols human impacts have increased since at least the late Pleistocene (2), and of fragile, untouched nature (9, 10), and recent findings on adaptive this trend will likely continue as we advance into the Anthropocene, a behavior have not yet been broadly incorporated into orangutan con- new epoch proposed to acknowledge the pervasive worldwide im- servation strategy (19). This is not surprising because conservation pact of human activities (6). Our limited understanding of how practice lags behind research (20, 21), but it does hinder effective on January 15, 2019 adaptability and threat interact to determine species’ vulnerability to conservation action on behalf of orangutans. extinction hinders our ability to anticipate the implications of these A clear understanding of how orangutans have responded to pro- trends for conservation (7). Investigating how humans have shaped longed exposure to humans can offer new insights into their vulner- the abundance, distribution, and behavior of species in the past may ability and resilience to modern threats. Although climate-driven help inform conservation planning and practice for a future increas- vegetation change has been commonly cited as the cause of the marked ingly dominated by human activities (2–4, 7, 8). decline in orangutan distribution and abundance after the late Pleis- Orangutans provide a valuable opportunity to explore the poten- tocene [126 to 12 thousand years (ka) ago] (22–26), some researchers tial of this approach. Since the 1970s, the charismatic, critically en- have suggested that human hunting contributed significantly to this dangered orangutan has been an icon of wild nature under threat due decline (24–27). A comprehensive assessment of these competing to current human activities (9, 10). However, orangutans have been hypotheses has yet to be made. Here, we review the available paleon- subject to human influence for at least 70,000 years (11, 12). Recent re- tological, archeological, and genetic evidence to assess the relative impacts of environmental factors (specifically, climate-driven vegeta- 1Anthropology Program, University of Wisconsin Oshkosh, Oshkosh, WI 54901, USA. tion shifts) and human impacts (specifically, human hunting and habitat 2Department of Ecology and Natural Resource Management, Norwegian University of alteration) on orangutan populations in the past. We then discuss how Life Sciences, 1430 Ås, Norway. 3Department of Anthropology, New York University, our conclusions can enhance current interpretations of orangutan be- 4 New York, NY 10003, USA. Australian Research Center for Human Evolution, Environ- havior and inform orangutan conservation strategy in an increasingly mental Futures Research Institute, Griffith University, Brisbane, Queensland, Australia. 5Borneo Futures, Bandar Seri Begawan, BE1518 Brunei Darussalam. 6Kinabatangan human-dominated world. Orang-Utan Conservation Programme, Kota Kinabalu, Sabah, Malaysia. 7Department of Anthropology, Department of Ecology and Evolutionary Biology, Program in the Environment, and School for Environment and Sustainability, University of Michigan, HOW DID HUMANS INFLUENCE ORANGUTANS IN THE PAST? Ann Arbor, MI 48109, USA. 8School of Natural Sciences and Psychology, Liverpool John Moores University, Liverpool L3 3AF, UK. 9Institute for Biodiversity and Ecosystem Setting the stage Dynamics, University of Amsterdam, Science Park 904, Amsterdam 1098, Netherlands. A review of orangutan natural history is necessary for examining the 10Sustainable Places Research Institute and School of Biosciences, Cardiff Uni- 11 pressures, environmental or human-induced, that led to their decline versity, Cardiff, UK. School of Biological Sciences, University of Queensland, Brisbane, Queensland, Australia. after the late Pleistocene. Populations of wild orangutans persist on the *Corresponding author. Email: [email protected] Southeast Asian islands of Borneo (P. pygmaeus) and Sumatra (P. abelii Spehar et al., Sci. Adv. 2018; 4 : e1701422 27 June 2018 1 of 13 SCIENCE ADVANCES | REVIEW and acute threats: Long generation lengths mean that genetic adapta- tion happens very slowly and that populations cannot recover quickly from losses due to hunting, capture, or disease (34). The Miocene ancestors of orangutans lived in South or East Asia, with the genus Pongo originating at the Miocene/Pliocene boundary 6 to 5 million years (Ma) ago and reaching the southernmost extent of their historical range in Southeast Asia by 2 to 4 Ma ago (24). The late Miocene (12 to 5 Ma ago) saw the onset of the Asian monsoon system (35) and the initiation of El Niño Southern Oscillation events (36) that led to the irregular mast fruiting cycles characteristic of Southeast Asian forests (37). The Pleistocene (2.6 Ma to 12 ka ago) also saw marked climatic shifts in the form of cycling glacial and interglacial periods. During the extended glacial periods, the climate was generally cooler, drier, and more seasonal than in the briefer interglacials.
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