생태와환경 (Korean Journal of Ecology and Environment)
- 제38권4호통권114호
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- Pages.482-493
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- 2005
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- 2288-1115(pISSN)
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- 2288-1123(eISSN)
우리나라의 수계에서 어류채집 효율성을 위한 전기충격기의 도입
Introduction of an Electrofishing Technique for Assessments of Fish Assemblages to Korean Watersheds
- Hwang, Soon-Jin (Department of Environmental Science, Konkuck University) ;
- Bae, Dae-Yeul (School of Bioscience and Biotechnology, Chungnam National University) ;
- Lee, Jae-Yon (School of Bioscience and Biotechnology, Chungnam National University) ;
- Kim, Ja-Hyun (School of Bioscience and Biotechnology, Chungnam National University) ;
- An, Kwang-Guk (School of Bioscience and Biotechnology, Chungnam National University)
- 발행 : 2005.12.31
초록
본 연구의 목적은 2005년 6-9월까지 38개 조사지점을 대상으로 하여 채집된 어류의 종 수 및 개체 수 풍부도에 대란 전통적 채집방법 (주로, 투망 및 족대 이용)및 전기충격기를 이용하는 방법의 조사 효율성을 평가하는 것이었다. 채집도구는 전기충격기를 이용하는 방법 (EM), 전통적인 조사법 (CM) 및 이 두 가지 방법을 조합하는 기법 (CT)의 3가지로 구분하여 통계적 유의성 차이를 비교
The objective of this research was to evaluate an sampling effect of fish species and individual number on sampling techniques of electrofishing and conventional capture methods of cast net and kick net in 38 stream sites sampled during June - September, 2005. For the study, sampling gears were categorized as three types of electrofishing method (EM), conventional sampling technique (CM), and the combined technique (CT) of the electrofishing and the conventional method to compare statistical differences. Major differences of species composition between the CM and EM method were found in some benthic species of Misgurnus mizolepis and Iksookimia koreensis along with lithophilic species of Pungtungia herzi. These species were predominated in the EM rather than the CM, indicating that conventional sampling can underestimate the abundance of benthic or lithophilic species. In contrast ,individual number of typical water column species such as Zacco platypus and Zacco temmincki were more sampled by the CM, so that these fish populations were community overestimated. Also, t-tests on the types of sampling gear from various watersheds of Chogang Stream, Yugu Stream, Daejeon Stream, and Gap Stream showed that total individual numbers and species number in each stream were significantly (t values = 2.806-6.896, p values<0.05, n = 5-14) greater in the CT than the CM. Similar statistical significance (p<1.001, n = (10-24) on sampling seasons were observed during the monsoon and postmonsoon. These results indicate that if the electrofishing is not added to the conventional gears, the abundance of fish population and community can be underestimated and some benthic or lithophilic species may be excluded from the analysis, resulting in overall errors including sampling, fish fauna, and final judgement of community abundance. Overall our results strongly suggest that new application of electrofishing method along with the conventional sampling gears reduce sampling bias on underestimation of the real fish populations and communities.