Over the last 2 decades the Philippine tarsier (Carlito syrichta aka Tarsius syrichta) has had its conservation status revised from Endangered to Data Deficient to Near Threatened. The last status change was based on a study of the species' population density, which suggested that a single natural catastrophe could potentially wipe out the Philippine tarsier. In 2013 typhoon Haiyan hit Bohol, one of the island strongholds for this species. In this study we compare the density of the Bohol tarsier population within the Philippine Tarsier and Wildlife Sanctuary before and after the typhoon. We demonstrate that the typhoon significantly affected the density of the Philippine tarsier in the sanctuary. Before the typhoon, tarsier density was approximately 157 individuals/km2 whereas after the typhoon the density was a mere 36 individuals/km2. Prior to the typhoon, more Philippine tarsiers were found in older secondary forest than in younger secondary forest, whereas after the typhoon all observed individuals were found in relatively younger secondary forest. Vegetation plots where we observed Philippine tarsiers prior to the typhoon contained a mean of 33 trees/m2, with a mean diameter at breast height (DBH) of 24 cm, and a mean height of 4 m. After the typhoon vegetation plots contained an average of 156 trees, had a mean DBH of 6 cm, and a mean height of 2 m. Based on the IUCN Red List criteria, the reduction and fluctuation in the density of this species suggests that the conservation status of the Philippine tarsier should be changed to Vulnerable. This study indicates natural disasters can have a significant effect on the extinction risk of primates, with implications for future effects of anthropogenic climate change.

Keywords:
Bohol, Primate, Natural disaster, Conservation, Population density
1.
Brandon-Jones D, Eudey AA, Geissmann T, Groves CP, Melnick DJ, Morales JC, Shekelle M, Stewart CB (2004). Asian primate classification. International Journal of Primatology 25: 97-164.
2.
Brower J, Zar J, von Ende C (1990). Field and Laboratory Methods for General Ecology. Dubuque, Brown.
3.
Brown RM, Weghorst JA, Olson KV, Duya MR, Barley AJ, Duya MV, Shekelle M, Neri-Arboleda I, Esselstyn JA, Dominy NJ, Ong PS, Moritz GL, Luczon A, Diesmos MLL, Diesmos AC, Siler CD (2014). Conservation genetics of the Philippine tarsier: cryptic genetic variation restructures conservation priorities for an island archipelago primate. PLoS One 9: e104340.
4.
DENR (1998). Philippine Biodiversity: An Assessment and Action Plan. Makati City.
5.
Eisenberg J, Struhsaker T (1981). Census methods for estimating densities. In Techniques for the Study of Primate Population Ecology. Washington, National Academy of Science Press.
6.
Emanuel K (1987). The dependence of hurricane intensity on climate. Nature 326: 483-485.
7.
Emanuel K (2005). Increasing destructiveness of tropical cyclones over the past 30 years. Nature 436: 686-688.
8.
Everham E, Brokaw N (1996). Forest damage and recovery from catastrophic wind. Botanical Review 62: 113-185.
9.
Grow N, Gursky-Doyen S, Kryzton A (2013). High Altitude Primates. New York, Springer.
10.
Gursky-Doyen S (2012). Acoustic characterization of ultrasonic vocalizations in the Philippine tarsier. Primates 54: 293-299.
11.
Gursky-Doyen S, Salibay C, Cuevas C (2011). Conservation status of the Philippine tarsier. Folia Primatologica 82: 189-196.
12.
Hamilton W (1979). Tectonics of the Indonesian Region. United States Geological Survey, p 345.
13.
Hansen G, Stone D, Auffhammer M, Carey M, Huggel C (2013). The challenge to detect and attribute effects of climate change on human and natural systems. Climate Change 121: 381-395.
14.
IUCN (2008). Red Data Book. New York, IUCN Press.
15.
Kosson J, Olander T, Knapp K (2013). Trend analysis with a new global record of tropical cyclone intensity. Journal of Climate 26: 9960-9976.
16.
Lewis R, Bannar-Martin K (2012). The impact of cyclone Fanele on a tropical dry forest in Madagascar. Biotropica 44: 135-140.
17.
Merker S, Yustian I, Muhlenberg M (2005). Responding to forest degradation: altered habitat use by Dian's tarsier Tarsius dianae in Sulawesi, Indonesia. Oryx 39: 189-195.
18.
Metcalfe D, Bradford M, Ford A (2008). Cyclone damage to tropical rain forests: species- and community-level impacts. Austral Ecology 33: 432-441.
19.
Neri-Arboleda I (2001). Ecology and Behavior of Tarsius syrichta in Bohol, Philippines: Implications for Conservation. MSc thesis, Department of Applied and Molecular Ecology, University of Adelaide.
20.
Neri-Arboleda I (2010). Strengths and weaknesses of a population viability analysis for Philippine tarsiers. International Journal of Primatology 31: 1192-1207.
21.
Pavelka M, Brussellers O, Nowak D, Behie A (2003). Population reduction and social disorganization in Alouatta pigra following a hurricane. International Journal of Primatology 24: 1037-1055.
22.
Rickert E, Balete D, Rowe R, Heaney L (2011). Mammals of the northern Philippines: tolerance for habitat disturbance and resistance to invasive species in an endemic insular fauna. Diversity and Distributions 17: 530-541.
23.
Shekelle M, Arboleda I (2008). Tarsius syrichta. The IUCN Red List of Threatened Species 2008. http://iucnredlist.org (accessed September 20, 2015).
24.
Simpson R, Saffir H (2007). Tropical cyclone destructive potential by integrated kinetic energy. Bulletin of the American Meterological Society 88: 1799-1800.
25.
Sokal R, Rohlf J (1991). Biometry. New York, Freeman.
26.
Webster P, Holland G, Curry J, Chang H (2005). Changes in tropical cyclone number, duration and intensity in a warming environment. Science 309: 1844-1846.
27.
Wolfheim J (1986). The Distribution, Ecology and Habitat of Primates. Cambridge, Cambridge University Press.
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