Title
Impact of prey occupancy and other ecological and anthropogenic factors on tiger distribution in Thailand's western forest complex
Author(s)
Duangchatrasiri, Somphot;Jornburom, Pornkamol;Jinamoy, Sitthichai;Pattanvibool, Anak;Hines, James E.;Arnold, Todd W.;Fieberg, John;Smith, James L. D.
Published
2019
Publisher
Ecology and Evolution
Published Version DOI
https://doi.org/10.1002/ece3.4845
Abstract
Abstract Despite conservation efforts, large mammals such as tigers (Panthera tigris) and their main prey, gaur (Bos gaurus), banteng (Bos javanicus), and sambar (Rusa unicolor), are highly threatened and declining across their entire range. The only large viable source population of tigers in mainland Southeast Asia occurs in Thailand's Western Forest Complex (WEFCOM), an approximately 19,000 km2 landscape of 17 contiguous protected areas. We used an occupancy modeling framework, which accounts for imperfect detection, to identify the factors that affect tiger distribution at the approximate scale of a female tiger's home range, 64 km2, and site use at a scale of 1-km2. At the larger scale, we estimated the proportion of sites at WEFCOM that were occupied by tigers; at the finer scale, we identified the key variables that influence site-use and developed a predictive distribution map. At both scales, we examined key anthropogenic and ecological factors that help explain tiger distribution and habitat use, including probabilities of gaur, banteng, and sambar occurrence from a companion study. Occupancy estimated at the 64-km2 scale was primarily influenced by the combined presence of all three large prey species, and 37% or 5,858 km2 of the landscape was predicted to be occupied by tigers. In contrast, site use estimated at the scale of 1 km2 was most strongly influenced by the presence of sambar. By modeling occupancy while accounting for imperfect probability of detection, we established reliable benchmark data on the distribution of tigers in WEFCOM. This study also identified factors that limit tiger distributions; which managers can then target to expand tiger distribution and guide recovery elsewhere in Southeast Asia.
Keywords
large landscape survey;multiple scale occupancy;Panthera tigris;prey;tiger;Western Forest Complex

Access Full Text

A full-text copy of this article may be available. Please email the WCS Library to request.



Back

PUB24405