한국환경생태학회지 (Korean Journal of Environment and Ecology)

  • 제28권3호
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  • Pages.273-280
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  • 2014
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  • 1229-3857(pISSN)
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  • 2288-131X(eISSN)
한국환경생태학회 (Korean Society of Environment and Ecology)
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고속도로 소음에 의한 북방산개구리의 생물음향학적 특성 변화 연구

Bioacoustic Change of Dybowski's Brown Frog by Highway Noise

  • 기경석 (상지대학교 친환경식물학부 원예조경학전공) ;
  • 성찬용 (계명대학교 환경계획학과)
  • 투고 : 2014.04.18
  • 심사 : 2014.06.12
  • 발행 : 2014.06.30
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초록

본 연구는 번식기 북방산개구리(Rana dybowskii)를 대상으로 고속도로 소음지역과 자연지역에서 울음소리 차이가 있는지 분석하였다. 연구대상지는 강원도 원주시 영동고속도로변 논 2개소와 소음 영향이 없는 자연지역 논 2개소를 선정하였다. 울음 녹음은 2014년 2월 24일, 2월 27일, 3월 14일, 18:30~20:00 사이에 진행하였다. 북방산개구리 번식기 울음은 자연지역에서 700Hz대에서 기음이 형성되었으며, 2~4개의 배음이 관측되었다. 반면 고속도로 소음지역 번식기 울음은 보다 높은 주파수대에서 기음이 형성되었을 뿐 아니라 배음도 2~7개까지 관측되었다. 분산분석 결과, 고속도로 소음에 직접 노출된 논에 서식하는 개구리 울음소리 제1배음의 주파수가 다른 지점에 서식하는 개구리 울음소리 주파수 보다 통계적으로 유의미하게 높은 것으로 나타났다. 하지만 고속도로와 인접한 지역이라 하더라도 지형의 단차가 있고 산림으로 막혀 있어 고속도로 소음에 의한 직접적인 영향을 받고 있지 않은 지점의 경우는 자연지역과 개구리 울음소리 차이가 없는 것으로 나타났다. 이는 북방산개구리가 고속도로 소음 환경에서 자연지역보다 고주파 영역에서 더 많은 배음을 만들어서 에너지 효율적으로 자동차 소음에 의한 음향 간섭을 피하기 때문으로 판단된다. 이 결과는 또한 인공적인 소음에 의한 개구리 번식을 방해하지 않기 위해서는 이 임계수준 이하로 서식처 소음 환경을 관리하는 것이 필요하다는 것을 시사해 준다.

This study examined whether Dybowski's brown frogs(Rana dybowskii) in noisy highway roadsides had different mating calls from those in natural sites. We selected four study sites: two rice paddy sites in Youngdong Highway roadside and two nearby natural counterparts. Frog calls were recorded between 18:30 and 20:00 on February 24, February 27, and March 14, 2014. Frog calls in the natural sites had fundamental frequency approximately at 700 Hz with two to four apparent harmonics, while frog calls in the highway sites had higher fundamental frequency with up to seven apparent harmonics. Analysis of variance (ANOVA) shows that a roadside site that are directly exposed to highway noise had statistically higher frog calling frequency than other study sites. However, the higher calling frequency was not found in another roadside site that differed in elevation from the highway and was buffered by forests. These results indicate that male frogs in a noisy highway roadside called females with a higher pitch and more apparent harmonics to avoid being masked by highway noise. These results also suggest that there is a threshold noise level that interrupts frog's mating behavior and it is needed to maintain highway roadside noise to this threshold level.

키워드

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