Riparian Herpetofauna of the Guandaushi subtropical forest in Taiwan
Dept of Biology, National Changhua University of Education, Changhua, Taiwan 500
This is a Long-Term Ecology Research (LTER) study on the amphibians and reptiles of the Guandaushi forest ecosystem at the Experimental Forest Station of the National Chung-Hsing University. We conducted the community and population studies on the amphibians and reptiles at the headwater of a tributary of the Guandaushi, located in a 46-ha. watershed. Field studies were done monthly at night from 19:30-01:00. We waded up the beds of a creek and collected the frogs with headlamps. We measured sex, body weight, and snout vent length (SVL) and marked Rana swinhoana and Bufo bankorensis using transponders. We collected several R.swinhoana monthly to study the breeding pattern and stomach contents. The herpetological community in the study area consisted of 6 and 4 species of amphibians and reptiles, respectively, among which the ranid, R.swinhoana, was the dominant species. The seasonal activity of the R.swinhoana was correlated with the temperatures and stream discharge, but not the rainfall. The change of gonadal-somatic index suggests that the breeding season of R. swinhoana is from the November to April. R. swinhoana consumed primarily insects which included orthopterans, coleopterans, and hymenopterans. We encountered 795 (included recapture) and marked 271 R.swinhoana from Aug 96-July 97. Recapture rate of R. swinhoana varied from 50-80 %. The population size estimated by three methods was about 200. R. swinhoana exhibited a high site-fidelity, and more frogs were distributed in the downstream sections near the reservoirs.