Journal of Ecology and Environment

The Ecological Society of Korea (한국생태학회)
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Estimating Detection Probabilities and Site Occupancy Rates of Three Anuran Species Using Call Surveys in Haenam Gun, Korea

  • Sung, Ha-Cheol (Department of Biology Education, Korea National University of Education) ;
  • Kim, Su-Kyung (Department of Biology Education, Korea National University of Education) ;
  • Cheong, Seok-Wan (Department of Biology Education, Korea National University of Education) ;
  • Park, Shi-Ryong (Department of Biology Education, Korea National University of Education) ;
  • Roh, Dong-Chan (Jeonbuk Science High School) ;
  • Baek, Kyung-Whan (Haenam High School) ;
  • Lee, Jung-Hyun (Department of Science Education, Kangwon National University) ;
  • Park, Dae-Sik (Department of Science Education, Kangwon National University)
  • Published : 2006.08.30
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Abstract

We investigated the distribution of three anuran species, Three-striped pond frogs (Rana nigromaculata), Bullfrogs (Rana catesbeiana), and Narrow-mouthed toads (Kaloula borealis), in an administrative district, Haenam Gun, Junnam Province, Korea using volunteer call surveys. Twenty-eight volunteer call surveyors were assigned to each $2{\times}2km^2$ survey plot. Call surveys on whether the species are present or not were conducted for 5 minutes between 30 minutes after sunset and the midnight on rice fields and ponds from 10 April to 28 August in 2005. Depending on species, call surveys were carried out at seven to 28 plots with average 8.4 to 10.7 visits per the plot. We calculated the detection probabilities and occupancy rates of the three species using four models with three covariates: temperature, humidity, and the amount of water at the habitat. The model average detection probabilities of three anuran species of R. nigromaculata, R. catesbeiana, and K. borealis were 0.53, 0.74, and 0.41 respectively, and the site occupancy rates of them were 0.93, 0.94, and 0.86 respectively. Our results indicate that R. nigromaculata, R. catesbeiana, and K. borealis are common in Haenam Gun.

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