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Tuesday, February 7 • 2:20pm - 2:40pm
Technical Session. Nest Success and Species Composition of Nest Predators in Dry Evergreen Forest of Northeast Thailand

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AUTHORS: Daphawan Khamcha, George A. Gale -Conservation Ecology Program, School of Bioresources and Technology, King Mongkut’s University of Technology Thonburi (Thailand)

ABSTRACT: Nest survival and nest success are key parameters that can be used to estimate and predict changes in avian populations. We investigated nest success and defined nest predators in dry evergreen forest in the Sakaerat Environmental Research Station (SERS) in northeastern Thailand. During the breeding season from February to August we searched for nests along two, 1km transects starting at the edge into the forest interior. To assess the nest predator species, video cameras and camera traps were placed on active nests of selected species. During the breeding seasons of 2014 -2016 we found 307 active nests from 24 species. The overall Mayfield nest success was 7.7% and the predation rate was high (84%). From video cameras and camera traps set at 156 nests from 17 species, we detected 95 predation events and recorded 12 nest predator species. Snakes were the main predator (30%) followed by Pig-tailed Macaque (Macaca leonina) (23%), Common Green Magpie (Cissa chinensis) (17%) and raptors (14%). Nest success in our study was quite low compared with other studies in tropical forests including our previous study in a nearby old-growth evergreen forest, which was typically closer to 20%. The predation rate in SERS was also higher than other studies. Species composition of nest predators was similar to other studies in the region but the top nest predator in the regional studies was the Pig-tailed macaque (~40% of predation events). It seems that the predation by Pig-tailed Macaque was compensated by snakes in SERS. The mechanisms that cause such high predation rates in SERS are still unclear, however differences in the predator community and behaviors affected by edge effects and habitat fragmentation may be significant factors.

Tuesday February 7, 2017 2:20pm - 2:40pm CST
Grand Ballroom D

Attendees (4)