Geographic distribution, population and conservation status of Tragulus nigricans, an endangered mouse deer endemic to western Philippines
Christian E. Supsup
A E , Augusto A. Asis B , Uldarico V. Carestia
+ Author Affiliations
- Author Affiliations
A Biology Department, De La Salle University, 2401 Taft Avenue, Manila, 1004, Philippines.
B Puerto Princesa Subterranean River National Park, Puerto Princesa City, 5300, Philippines.
C Yapang, Barangay Batong-Buhay, Sablayan, Occidental Mindoro, 5104, Philippines.
D Carandang Street, Barangay Manggahan, Puerto Princesa City, 5300, Philippines.
E Corresponding author. Emails: supsupchristian@gmail.com, christian.supsup@dlsu.edu.ph
Pacific Conservation Biology 28(1) 90-96 https://doi.org/10.1071/PC21001
Submitted: 19 January 2021 Accepted: 18 February 2021 Published: 23 March 2021
Abstract
The Philippine mouse deer (Tragulus nigricans) is an endangered ungulate species, endemic to the Balabac Islands in the Palawan Faunal Region of the western Philippines. Despite its conservation importance, it has received little attention from local authorities and conservation biologists, with limited studies conducted on the species. Here we provide a preliminary report on the species distribution, population and conservation status, based on our recently completed surveys. We used a combination of line transect distance sampling, opportunistic searching on targeted habitats, and informal community interviews to assess the species’ status. We recorded a total of 25 sightings of mouse deer during our transect surveys. All records, including recent sightings of mouse deer, were from two islands, mainland Balabac and Bugsuk. No mouse deer were recorded on other islands that we surveyed, suggesting that the populations have been markedly reduced due to a nearly complete conversion of natural habitat, such as Ramos Island, or perhaps some islands are too small to permanently support populations. Our analyses revealed that the species occurs at low density (0.219 ± 0.084/ha), particularly on Balabac. The mean population estimate based on Bayesian analysis is 2525 (95% Highest Density Interval, 1635–3461). However, this number is highly uncertain because of the low probability, highlighting the need for more information on the species’ population. Several conservation efforts are being implemented now, but more intensive in situ conservation programs would benefit the species, along with other threatened endemics found in the region.
Keywords: Balabac Islands, chevrotains, hunting, Palawan, threatened, ungulates.
References
Allen, J. A. (1910). Mammals from Palawan Island, Philippine Islands. Bulletin of the American Museum of Natural History 28, 13–17.Bintanja, R., van de Wal, R. S. W., and Oerlemans, J. (2005). Modelled atmospheric temperatures and global sea levels over the past million years. Nature 437, 125–128.
| Modelled atmospheric temperatures and global sea levels over the past million years.Crossref | GoogleScholarGoogle Scholar | 16136140PubMed |
Corbet, G. B., and Hill, J. E. (1992). ‘The Mammals of the Indomalayan Region: a Systematic Review.’ (Oxford University Pres: Oxford, UK.)
DOST-PAGASA (2019). Department of Science and Technology – Philippine Atmospheric, Geophysical and Astronomical Services Administration (DOST-PAGASA) climate data. Available at http://bagong.pagasa.dost.gov.ph/climate/ [accessed 10 April 2020].
Dubost, G. (1975). Le comportement du Chevrotain africain, Hyemoschus aquaticus Ogilby (Artiodactyla, Ruminantia). Zeitschrift für Tierpsychologie 37, 403–448.
| Le comportement du Chevrotain africain, Hyemoschus aquaticus Ogilby (Artiodactyla, Ruminantia).Crossref | GoogleScholarGoogle Scholar | 1229772PubMed |
Esselstyn, J. A., Widmann, P., and Heaney, L. R. (2004). The mammals of Palawan Island, Philippines. Proceedings of the Biological Society of Washington 117, 271–302.
Groves, C. P., and Grubb, P. (2011). ‘Ungulate Taxonomy.’ (Johns Hopkins University Press: Baltimore, MD.)
Hall, R. (2002). Cenozoic geological and plate tectonic evolution of SE Asia and the SW Pacific: computer-based reconstructions, model and animations. Journal of Asian Earth Sciences 20, 353–431.
| Cenozoic geological and plate tectonic evolution of SE Asia and the SW Pacific: computer-based reconstructions, model and animations.Crossref | GoogleScholarGoogle Scholar |
Hannaford, A. E. (1899). ‘History and Description of our Philippine Wonderland, and Photographic Panorama of Hawaii, Cuba, Porto Rico, Samoa, Guam, and Wake Island, with Entertaining Accounts of their Peoples and Modes of Living, Customs, Industries, Climate and Present Conditions.’ (The Crowell and Kirkpatrick Co.: Springfield, OH.)
Heaney, L. R., Balete, D. S., Dolar, M. L., Alcala, A. C., Dans, A. T. L., Gonzales, P. C., Ingle, N. R., Lepiten, M. V., Oliver, W. L. R., Ong, P. S., Rickart, E. A., Tabaranza, B. R., and Utzurrum, R. C. B. (1998). A synopsis of the mammalian fauna of the Philippine Islands. Fieldiana: Zoology 88, 1–61.
Heaney, L. R., Balete, D. S., and Rickart, E. A. (2016). ‘The Mammals of Luzon Island: Biogeography and Natural History of a Philippine Fauna.’ (Johns Hopkins University Press: Baltimore, MD.)
Heydon, M. J., and Bulloh, P. (1997). Mousedeer densities in a tropical rainforest: the impact of selective logging. Journal of Applied Ecology 34, 484–496.
| Mousedeer densities in a tropical rainforest: the impact of selective logging.Crossref | GoogleScholarGoogle Scholar |
Hoogstraal, H. (1951). Philippine Zoological Expedition, 1946–1947: narrative and itinerary. Fieldiana: Zoology 33, 1–85.
IUCN (2020). The IUCN Red List of Threatened Species. Version 2020-1. Available at https://www.iucnredlist.org [accessed 16 April 2020].
Janis, C. (1984). Tragulids as living fossils. In ‘Living Fossils’. (Eds N. Eldredge, and S. M. Stanley.) pp. 87–94. (Springer: New York, NY)
Mallari, N. A. D., Tabaranza, B. R., and Crosby, M. J. (2001). ‘Key Conservation Sites in the Philippines: a Haribon Foundation and BirdLife International Directory of Important Bird Areas.’ (Bookmark: Manila.)
Mallari, N. A. D., Collar, N. J., Lee, D. C., McGowan, P. J. K., Wilkinson, R., and Marsden, S. J. (2011). Population densities of understorey birds across a habitat gradient in Palawan, Philippines: implications for conservation. Oryx 45, 234–242.
| Population densities of understorey birds across a habitat gradient in Palawan, Philippines: implications for conservation.Crossref | GoogleScholarGoogle Scholar |
Matsubayashi, H., Bosi, E., and Kohshima, S. (2003). Activity and habitat use of lesser mouse-deer (Tragulus javanicus). Journal of Mammalogy 84, 234–242.
| Activity and habitat use of lesser mouse-deer (Tragulus javanicus).Crossref | GoogleScholarGoogle Scholar |
Matsubayashi, H., Bosi, E., and Kohshima, S. (2006). Social system of the lesser mouse-deer (Tragulus javanicus). Mammal Study 31, 111–114.
| Social system of the lesser mouse-deer (Tragulus javanicus).Crossref | GoogleScholarGoogle Scholar |
Meijaard, E., and Groves, C. P. (2004). A taxonomic revision of the Tragulus mouse-deer (Artiodactyla). Zoological Journal of the Linnean Society 140, 63–102.
| A taxonomic revision of the Tragulus mouse-deer (Artiodactyla).Crossref | GoogleScholarGoogle Scholar |
Miller, D. L., Rexstad, E., Thomas, L., Marshall, L., and Laake, J. L. (2019). Distance sampling in R. Journal of Statistical Software 89, 1–28.
| Distance sampling in R.Crossref | GoogleScholarGoogle Scholar |
Oliver, W. L. R. (1993). Threatened endemic artiodactyls of the Philippines: status and future priorities. International Zoo Yearbook 32, 131–144.
| Threatened endemic artiodactyls of the Philippines: status and future priorities.Crossref | GoogleScholarGoogle Scholar |
PCSD (2015). State of the environment of Palawan: 2015 updates. Palawan Council for Sustainable Development, Puerto Princesa City.
Rabor, D. S. (1968). Threatened species of small mammals in tropical South East Asia. The problem in the Philippines. In ‘Conservation in Tropical South East Asia’. pp. 272. (International Union for Conservation of Nature and Natural Resources: Switzerland.)
Rabor, D. S. (1977). ‘Philippine Birds and Mammals: a Project of the U.P. Science Education Center’. (University of the Philippines Press: Quezon City.)
Rabor, D. S. (1986). ‘Guide to the Philippine Flora and Fauna, Vol. XI: Birds, Mammals.’ (Natural Resources Management Center, Ministry of Natural Resources, and University of the Philippines: Manila.)
Ralls, K., Barasch, C., and Minkowski, K. (1975). Behavior of captive mouse deer, Tragulus napu. Zeitschrift für Tierpsychologie 37, 356–378.
| Behavior of captive mouse deer, Tragulus napu.Crossref | GoogleScholarGoogle Scholar | 1241752PubMed |
R Core Team (2020). R: a language and environment for statistical computing. Available at https://www.r-project.org/.
Rickart, E. A., Heaney, L. R., Balete, D. S., Alviola, P. A., Duya, M. R. M., Duya, M. V., Rosell-Ambal, G., and Sedlock, J. L. (2013). The mammals of Mt. Natib, Bataan Province, Luzon, Philippines. National Museum of the Philippines Journal of Natural History 1, 31–44.
Rico, E. L., and Oliver, W. L. R. (2008). Biodiversity conservation priorities in the Calamian Islands – gaps and opportunities. Unpublished report. Palawan Council for Sustainable Development, Puerto Princesa City.
Sanborn, C. C. (1952). ‘Philippine Zoological Expedition 1946–1947’. (Fieldiana: Zoology: Chicago.) Available at https://www.biodiversitylibrary.org/item/21102.
Steuer, S., Franke, D., Meresse, F., Savva, D., Pubellier, M., Auxietre, J.-L., and Aurelio, M. (2013). Time constraints on the evolution of southern Palawan Island, Philippines from onshore and offshore correlation of Miocene limestones. Journal of Asian Earth Sciences 76, 412–427.
| Time constraints on the evolution of southern Palawan Island, Philippines from onshore and offshore correlation of Miocene limestones.Crossref | GoogleScholarGoogle Scholar |
Supsup, C. E. (2020). The conservation status of ecologically important species and their critical habitats in the municipalities of Roxas, El Nido, Busuanga and Balabac. Unpublished report. Palawan Council for Sustainable Development, Puerto Princesa City.
Supsup, C. E., and Asis, A. A. (2018). Identifying important habitats of endemic and threatened species in Puerto Princesa. Palawan. Our Palawan 4, 1–20.
Thomas, O. (1892). On some new Mammalia from the East-Indian Archipelago. The Annals and Magazine of Natural History 9, 250–254.
| On some new Mammalia from the East-Indian Archipelago.Crossref | GoogleScholarGoogle Scholar |
Thomas, L., Buckland, S. T., Rexstad, E. A., Laake, J. L., Strindberg, S., Hedley, S. L., Bishop, J. R. B., Marques, T. A., and Burnham, K. P. (2010). Distance software: design and analysis of distance sampling surveys for estimating population size. Journal of Applied Ecology 47, 5–14.
| Distance software: design and analysis of distance sampling surveys for estimating population size.Crossref | GoogleScholarGoogle Scholar |
Voris, H. K. (2000). Maps of Pleistocene sea levels in Southeast Asia: shorelines, river systems and time durations. Journal of Biogeography 27, 1153–1167.
| Maps of Pleistocene sea levels in Southeast Asia: shorelines, river systems and time durations.Crossref | GoogleScholarGoogle Scholar |
Widmann, P., Nunez, J., Antonio, R., and Widmann, I. (2017). Palawan Deer Research and Conservation Program. Unpublished report. Katala Foundation, Puerto Princesa City.
Zootierliste (2020). Zootierliste: a database for the current and former vertebrate inventories of European zoos and other public collections. Available at https://www.zootierliste.de/en/ [accessed 22 May 2020].
