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10.11609/jot.2020.12.9.15967-16194 www.threatenedtaxa.org Journal ofThreatened 26 June 2020 (Online & Print) Vol. 12 | No. 9 | Pages: 15967–16194 ISSN 0974-7907 (Online) | ISSN 0974-7893 (Print) JoTT PLATINUM OPEN ACCESS TaxaBuilding evidence for conservaton globally ISSN 0974-7907 (Online); ISSN 0974-7893 (Print) Publisher Host Wildlife Informaton Liaison Development Society Zoo Outreach Organizaton www.wild.zooreach.org www.zooreach.org No. 12, Thiruvannamalai Nagar, Saravanampat - Kalapat Road, Saravanampat, Coimbatore, Tamil Nadu 641035, India Ph: +91 9385339863 | www.threatenedtaxa.org Email: [email protected] EDITORS English Editors Mrs. Mira Bhojwani, Pune, India Founder & Chief Editor Dr. Fred Pluthero, Toronto, Canada Dr. Sanjay Molur Mr. P. Ilangovan, Chennai, India Wildlife Informaton Liaison Development (WILD) Society & Zoo Outreach Organizaton (ZOO), 12 Thiruvannamalai Nagar, Saravanampat, Coimbatore, Tamil Nadu 641035, Web Design India Mrs. Latha G. Ravikumar, ZOO/WILD, Coimbatore, India Deputy Chief Editor Typesetng Dr. Neelesh Dahanukar Indian Insttute of Science Educaton and Research (IISER), Pune, Maharashtra, India Mr. Arul Jagadish, ZOO, Coimbatore, India Mrs. Radhika, ZOO, Coimbatore, India Managing Editor Mrs. Geetha, ZOO, Coimbatore India Mr. B. Ravichandran, WILD/ZOO, Coimbatore, India Mr. Ravindran, ZOO, Coimbatore India Associate Editors Fundraising/Communicatons Dr. B.A. Daniel, ZOO/WILD, Coimbatore, Tamil Nadu 641035, India Mrs. Payal B. Molur, Coimbatore, India Dr. Mandar Paingankar, Department of Zoology, Government Science College Gadchiroli, Chamorshi Road, Gadchiroli, Maharashtra 442605, India Dr. Ulrike Streicher, Wildlife Veterinarian, Eugene, Oregon, USA Editors/Reviewers Ms. Priyanka Iyer, ZOO/WILD, Coimbatore, Tamil Nadu 641035, India Subject Editors 2016–2018 Fungi Editorial Board Ms. Sally Walker Dr. B. Shivaraju, Bengaluru, Karnataka, India Founder/Secretary, ZOO, Coimbatore, India Prof. Richard Kiprono Mibey, Vice Chancellor, Moi University, Eldoret, Kenya Dr. R.K. Verma, Tropical Forest Research Insttute, Jabalpur, India Dr. Robert Lacy Dr. V.B. Hosagoudar, Bilagi, Bagalkot, India Department of Conservaton Biology, Chicago Zoological Society (also known as Dr. Vatsavaya S. Raju, Kakatay University, Warangal, Andhra Pradesh, India the Brookfeld Zoo), Brookfeld, Illinois 60513 USA; and Commitee on Evolutonary Dr. D.J. Bhat, Retd. Professor, Goa University, Goa, India Biology, University of Chicago Plants Dr. Russel Mitermeier Executve Vice Chair, Conservaton Internatonal, Arlington, Virginia 22202, USA Dr. G.P. Sinha, Botanical Survey of India, Allahabad, India Dr. N.P. Balakrishnan, Ret. Joint Director, BSI, Coimbatore, India Prof. Mewa Singh Ph.D., FASc, FNA, FNASc, FNAPsy Dr. Shonil Bhagwat, Open University and University of Oxford, UK Ramanna Fellow and Life-Long Distnguished Professor, Biopsychology Laboratory, Prof. D.J. Bhat, Retd. Professor, Goa University, Goa, India and Insttute of Excellence, University of Mysore, Mysuru, Karnataka 570006, India; Dr. Ferdinando Boero, Università del Salento, Lecce, Italy Honorary Professor, Jawaharlal Nehru Centre for Advanced Scientfc Research, Dr. Dale R. Calder, Royal Ontaro Museum, Toronto, Ontario, Canada Bangalore; and Adjunct Professor, Natonal Insttute of Advanced Studies, Bangalore Dr. Cleofas Cervancia, Univ. of Philippines Los Baños College Laguna, Philippines Dr. F.B. Vincent Florens, University of Mauritus, Mauritus Dr. Ulrike Streicher, DVM Dr. Merlin Franco, Curtn University, Malaysia Wildlife Veterinarian / Wildlife Management Consultant, 1185 East 39th Place, Eugene, Dr. V. Irudayaraj, St. Xavier’s College, Palayamkotai, Tamil Nadu, India OR 97405, USA Dr. B.S. Kholia, Botanical Survey of India, Gangtok, Sikkim, India Dr. Pankaj Kumar, Kadoorie Farm and Botanic Garden Corporaton, Hong Kong S.A.R., Stephen D. Nash China Scientfc Illustrator, Conservaton Internatonal, Dept. of Anatomical Sciences, Health Dr. V. Sampath Kumar, Botanical Survey of India, Howrah, West Bengal, India Sciences Center, T-8, Room 045, Stony Brook University, Stony Brook, NY 11794-8081, Dr. A.J. Solomon Raju, Andhra University, Visakhapatnam, India USA Dr. Vijayasankar Raman, University of Mississippi, USA Dr. B. Ravi Prasad Rao, Sri Krishnadevaraya University, Anantpur, India Dr. Fred Pluthero Dr. K. Ravikumar, FRLHT, Bengaluru, Karnataka, India Toronto, Canada Dr. Aparna Watve, Pune, Maharashtra, India Dr. Qiang Liu, Xishuangbanna Tropical Botanical Garden, Yunnan, China Dr. Martn Fisher Dr. Noor Azhar Mohamed Shazili, Universit Malaysia Terengganu, Kuala Terengganu, Senior Associate Professor, Batcock Centre for Experimental Astrophysics, Cavendish Malaysia Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, UK Dr. M.K. Vasudeva Rao, Shiv Ranjani Housing Society, Pune, Maharashtra, India Prof. A.J. Solomon Raju, Andhra University, Visakhapatnam, India Dr. Ulf Gärdenfors Dr. Mandar Datar, Agharkar Research Insttute, Pune, Maharashtra, India Professor, Swedish Species Informaton Center, SLU, Uppsala, Sweden Dr. M.K. Janarthanam, Goa University, Goa, India Dr. K. Karthigeyan, Botanical Survey of India, India Dr. John Fellowes Dr. Errol Vela, University of Montpellier, Montpellier, France Honorary Assistant Professor, The Kadoorie Insttute, 8/F, T.T. Tsui Building, The Dr. P. Lakshminarasimhan, Botanical Survey of India, Howrah, India University of Hong Kong, Pokfulam Road, Hong Kong Dr. Larry R. Noblick, Montgomery Botanical Center, Miami, USA Dr. K. Haridasan, Pallavur, Palakkad District, Kerala, India Dr. Philip S. Miller Dr. Analinda Manila-Fajard, University of the Philippines Los Banos, Laguna, Philippines Senior Program Ofcer, Conservaton Breeding Specialist Group (SSC/IUCN), 12101 Dr. P.A. Sinu, Central University of Kerala, Kasaragod, Kerala, India Johnny Cake Ridge Road, Apple Valley, MN 55124, USA Invertebrates Prof. Dr. Mirco Solé Universidade Estadual de Santa Cruz, Departamento de Ciências Biológicas, Vice- Dr. R.K. Avasthi, Rohtak University, Haryana, India coordenador do Programa de Pós-Graduação em Zoologia, Rodovia Ilhéus/Itabuna, Km Dr. D.B. Bastawade, Maharashtra, India 16 (45662-000) Salobrinho, Ilhéus - Bahia - Brasil Dr. Partha Pratm Bhatacharjee, Tripura University, Suryamaninagar, India contnued on the back inside cover Cover: Bengal Florican Houbaropsis bengalensis. © Chungba Sherpa. Journal of Threatened Taxa | www.threatenedtaxa.org | 26 June 2020 | 12(9): 15967–15974 ISSN 0974-7907 (Online) ISSN 0974-7893 (Print) PLATINUM OPEN ACCESS DOI: htps://doi.org/10.11609/jot.5818.12.9.15967-15974 5818 Received 27 February 2020 Final received 08 April 2020 Finally accepted 25 May 2020 C Dusky Langurs Trachypithecus obscurus (Reid, 1837) (Primates: Cercopithecidae) in Singapore: potental origin and conficts with natve primate species 1 2 3 Andie Ang , Sabrina Jabbar & Max Khoo 1,2 Raes’ Banded Langur Working Group, Wildlife Reserves Singapore Conservaton Fund, 80 Mandai Lake Road, 729826 Singapore. 3 Wildlife Management Research, Wildlife Management Division, Natonal Parks Board, 50 Dairy Farm Road, 679059 Singapore. 1 [email protected] (corresponding author), 2 [email protected], 3 [email protected] Abstract: The introducton of exotc species can have detrimental efects on local populatons via factors such as resource competton and new threats from disease. Singapore has three natve species of non-human primates: Sunda Slow Loris Nyctcebus coucang, Long- tailed Macaque Macaca fascicularis, and Raes’ Banded Langur Presbyts femoralis. Over the past few months, several non-natve Dusky Langurs Trachypithecus obscurus were observed in Singapore. We document our observatons, compile reports from social media, and atempt to assess the potental impacts on local primates. Whenever Dusky Langurs were encountered, we recorded the date, tme, GPS coordinates, group demographics, and behaviour, including interactons with natve primates. We also monitored sightng reports of Dusky Langurs posted on local major Facebook groups from 30 December 2019 to 31 January 2020, and privately messaged the person(s) for more informaton. On 31 August 2019, three Dusky Langurs were seen near a residental area in the northern part of Singapore, and two to three individuals were reported on 14 subsequent occasions. During one encounter on 18 January 2020, an adult male Long- tailed Macaque chased a group of Dusky Langurs from a feeding tree. The next day the same group of Dusky Langurs chased a group of 11 Banded Langurs from another feeding tree. The Dusky Langurs appeared to be healthy and wild, indicatng that they may have swum across the Johor Strait and/or traveled on the Johor-Singapore Causeway from Malaysia. Further monitoring of these Dusky Langurs will be required to assess their impact on local primates. Keywords: Colobine, dispersal, exotc, impacts, macaque. Editor: Susan M. Cheyne, Borneo Nature Foundaton Internatonal, Palangka Raya, Indonesia. Date of publicaton: 26 June 2020 (online & print) Citaton: Ang, A., S. Jabbar & M. Khoo (2020). Dusky Langurs Trachypithecus obscurus (Reid, 1837) (Primates: Cercopithecidae) in Singapore: potental origin and conficts with natve primate species. Journal of Threatened Taxa 12(9): 15967–15974. htps://doi.org/10.11609/jot.5818.12.9.15967-15974 Copyright: Ang et al. 2020. Creatve Commons Atributon 4.0 Internatonal License. JoTT allows unrestricted use, reproducton, and distributon of this artcle in any medium by providing adequate credit to the author(s) and the source of publicaton.