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Monitoring Extensive Breeding Populations and Daily Call Activity of the Gold-spotted Pond Frog, Rana chosenica in Chungju City and Chungwon Gun  

Sung, Ha-Cheol (Department of Biology Education, Korea National University of Education)
Cha, Sang-Min (Department of Biology Education, Korea National University of Education)
Kim, Suk-Kyung (Department of Biology Education, Korea National University of Education)
Park, Dae-Sik (Department of Science Education, Kangwon National University)
Park, Shi-Ryong (Department of Biology Education, Korea National University of Education)
Cheong, Seok-Wan (Department of Biology Education, Korea National University of Education)
Publication Information
Korean Journal of Environmental Biology / v.25, no.2, 2007 , pp. 94-99 More about this Journal
Abstract
To investigate the spatial distribution and daily calling pattern of the Gold-spotted pond frog, Rana chosenica, in Chungju city and Chungwon gun, Chungbuk province, Korea, we divided the study area into 226 plots with a $2{\times}2km^2$ plot on the map, of which we assigned 32 plots for monitoring populations. Call monitoring on whether the species are present or not were conducted for 5 minutes in between sunset and the midnight from at the end of May to July in 2006. Gold-spotted pond frogs were detected at least once four out of 32 plots. Using program Presence, we obtained site occupancy rate as 0.170 which was quite low compared with other species, while detection probability was 0.66 that propose at least three times to visit the monitoring site to confirm the absence of the frogs. The frogs were actively calling from 21:00 to 02:00, and the number of calling male was significantly and highly correlated with water temperature and humidity. This study shows the present status of the Gold-spotted pond frogs in Chungju city and Chungwon gun and we suggests various effective monitoring methods based on the this study.
Keywords
Gold-spotted pond frog; Rana chosenica; daily call activity; breeding population;
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