Estimating Dection Probabilities and Site Occupancy Rates of three Anuran Species Using Call Surveys in Haenam Gun, Korea
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Abstract
We investigated the distribution of three anuran species, Three-striped pond frogs (Rananigromaculata), Bullfrogs (Rana catesbeiana ), and Narow-mouthed toads (Kaloula borealis), in an administrativeveyors were assigned to each 2 2 km2survey plot. Call surveys on whether the species are present or notwere conducted for 5 minutes between 30 minutes after sunset and the midnight on rice fields and ponds from10 April to 28 August in 2005. Depending on species, call surveys were carried out at seven to 28 plots withaverage 8.4 to 10.7 visits per the plot. We calculated the detection probabilities and occupancy rates of the threespecies using four models with three covariates: temperature, humidity, and the amount of water at the habitat.The model average detection probabilities of thre 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 0.86respectively. Our results indicate thatR. nigromaculata, R. catesbeiana,and K. borealisare common in HaenamGun.
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