지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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In this study, Echo-sounder(Es) monitoring methodology was applied to test environmental impacts of artificial weirs(SCW and JSW) in the Yeongsan River on fish community and habitat structures at first time, and was compared with conventional fish sampling methodologies(Cs). For the Es monitoring in the fields, parallel transect methods was employed in determining the survey distance interval with every 125 m within the upper-lower 2 km of the weirs. Four different fish sampling gears such as casting nets, kick nets, fyke nets, and gill nets were used for applications of Cs monitoring methodology. According to the Echo-sounder monitoring, fish density, expressed as a number of individuals per square meter, along the longitudinal axis of the weir was significantly greater(JSW, t = 3.506, n = 30, p < 0.001) in the down-river reach of the weir than in the up-river reach. Also, fish density along the vertical water column was highest at mid-depths of Seungchon weir, which has simple habitat substrates, while fish density was highest at hypolimnetic depth of Juksan weir. According to fish sampling by the Cs methodology, the fish compositions decreased as the river goes upward, and significant differences(JSW, t = 0.248, n = 30, p < 0.05) in the compositions of fish species occurred between up-reach and down-reach of the weirs. The dominant species near the two weirs were Opsarichthys uncirostris amurensis, Hemiculter eigenmanni and Coilia nasus. Overall, our fish and habitat data, based on Es and Cs monitoring methodologies, suggest that the weirs disturbed the rivers due to initial habitat disturbances by the weir constructions as well as the barrier roles of weirs on fish passage and migrations. More long-term scientific and systematic fish impact monitoring and assessments(Es and Cs) are required in the future to predict changes of ecological structures and functions on the constructions of the weirs.
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참고문헌 (25)
참고문헌 신청
Abad, R. / 1998 / Acoustic estimation of abundanceand distribution of sardine in thenorthwestern Mediterranean / FisheriesResearch 34 : 239 ~ 245
Barbour, M. T. / 1999 / Rapid bioassessment protocols for use in streams and wadeable rivers: Periphyton, benthic macroinvertebrates and fish, Second Edition, In Environmental Protectio
Beauchamp, D.A / 1995 / Evaluation of competition and predation as limits to juvenile kokanee and sockeye salmon production in Lake Ozette, Washington / North American Journ
Beauchamp, D.A / 1997 / Hydroacoustic assessment of abundance and diel distribution of sockeye salmon and kokanee in the Sawtooth Valley Lakes / North American Journal of Fi
Brandt, S. B. / 1996 / Fisheries techniques / American Fisheries Society : 385 ~ 432
Barbour, M. T. / 1999 / Rapid bioassessment protocols for use in streams and wadeable rivers: Periphyton, benthic macroinvertebrates and fish, Second Edition, In Environmental Protectio
Beauchamp, D.A / 1995 / Evaluation of competition and predation as limits to juvenile kokanee and sockeye salmon production in Lake Ozette, Washington / North American Journ
Beauchamp, D.A / 1997 / Hydroacoustic assessment of abundance and diel distribution of sockeye salmon and kokanee in the Sawtooth Valley Lakes / North American Journal of Fi
Brandt, S. B. / 1996 / Fisheries techniques / American Fisheries Society : 385 ~ 432
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