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Water Temperature and Sound Environment Characteristics of Huanren Brown Frog Oviposition Sites

계곡산개구리 산란지의 수온 및 음환경 특성

  • Ki, Kyong-Seok (Dept. of Horticulture and Landscape Architecture, Soundscape Ecology Laboratory, Sangji Univ.) ;
  • Gim, Ji-Youn (Dept. of Applied Plant Science, Graduate School of Sangji Univ.) ;
  • Lee, Jae-Yoon (Dept. of Horticulture and Landscape Architecture, Soundscape Ecology Laboratory, Sangji Univ.)
  • Received : 2016.03.08
  • Accepted : 2016.06.28
  • Published : 2016.06.30

Abstract

The goal of this study was to identify the water temperature and sound environment of oviposition sites of the Huanren brown frog (Rana huanrensis), which breeds in valleys in early spring. The study was conducted in Chiak National Park, central Korea, between March 23 and April 24, 2015. Correlation analysis of the physical factors of oviposition sites revealed that the number of egg clutches was positively correlated (p < 0.05) with the water temperature and negatively correlated (p < 0.05) with the sound volume of the oviposition sites. However, no correlation was found between clutch number and the total area or depth of water. The water temperature of the oviposition sites was $2.2^{\circ}C$ higher on average than that of the mainstream (p < 0.001). To avoid the low early spring temperatures, R. huanrensis spawned in sites with accumulated water, in which the depths were less than 10cm and the temperature was relatively high. Further, eggs were spawned in clusters in small spaces to maximize the thermal insulation effect. In terms of noise levels, oviposition sites were found to be 6.9 dB quieter than the mainstream (p<0.001). In conclusion, R. huanrensis was found to spawn in warm, quiet, and small oviposition sites in valleys to avoid low early spring temperatures and loud water noise. This study is significant because it is the first to characterize the sound environment of amphibian oviposition sites.

본 연구의 목적은 이른 봄철 계곡에서 번식하는 계곡산개구리 산란지의 수온 및 음환경을 규명하는 것이다. 연구대상지는 한국 중부지역 치악산국립공원의 75개소이었다. 조사기간은 2015년 3월 23일부터 4월 24일까지이었다. 알덩이수와 산란지의 물리적 요인간 상관관계 분석결과 산란지 수온과는 양의 상관관계(p<0.05)를, 산란지 음량과는 음의 상관관계(p<0.05)를 나타내었다. 그러나 면적과 수심은 알덩이수와 상관관계를 나타내지 않았다. 계곡산개구리 산란지와 본류의 수온을 비교한 결과 산란지가 본류보다 평균 $2.2^{\circ}C$ 높았다(p<0.001). 계곡산개구리는 이른 봄철 낮은 온도를 극복하기 위하여 물이 고여 있고, 수심이 10cm 내외로 얕은 곳의 수온이 높은 곳에 산란하고 있었다. 또한 알들을 서로 붙여 낳음으로서 보온효과를 극대화하고 있었다. 계곡산개구리와 산란지의 음량을 본류와 비교한 결과 산란지는 본류보다 6.9dB 조용한 것으로 나타났다(p<0.001). 따라서, 계곡산개구리는 이른 봄철의 낮은 온도, 시끄러운 물소리를 극복하기 위하여 계곡 내에서도 수온이 높고, 조용한 미소서식지를 찾아 산란하는 것으로 판단된다. 본 논문은 양서류 산란지의 음환경 특성을 밝힌 첫번째 논문이라는데서 의의가 있다.

Keywords

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