하천 서식지 특성에 따른 피라미(Zacco platypus)의 총수은 함량 및 생태 건강성 분석 (Total Mercury Contents in the Tissues of Zacco platypus and Ecological Health Assessments in Association with Stream Habitat Characteristics)

서지정보

· 발행기관 : 한국수생태학회
· 수록지 정보 : 생태와 환경 / 41권 / 2호 / 188 ~ 197페이지
· 저자명 : 이의행, 윤상훈, 이재훈, 안광국

초록

This research was a preliminary case study to determine the levels of total mercury
in the tissues of sentinel species (Zacco platypus) and ecological health in relation to
habitat characteristics and chemical conditions. We collected fishes in Gap Stream
during June~October 2007 and analyzed the total mercury from five types of tissues
such as liver, kidney, gill, vertebrae and muscle of Zacco platypus using Direct
Mercury Analyzer (DMA-80, US EPA Method 7473). Mean concentrations of total
[Hg], based on all tissues, was 67.2 and 20.7 μg kg-1, in the upstream and downstream
site, respectively, indicating 3 times greater level in the upstream. In other words,
the levels were higher in the pristine upstream than the downstream influenced by
the wastewater disposal plant. Chemical water quality, based on BOD, COD and nutrients
(TN, TP) showed that severe degradation occurred in the downstreams than the
upstreams. Index of Biological Integrity (IBI) using fish multi-metric model averaged
32, indicating a “good~fair” condition and varied from 42 (excellent~good) at
S2 to 22 (fair~poor) at S5 depending on the sites sampled. Qualitative Habitat
Evaluation Index (QHEI) in the all sites averaged 142, which was judged as “good”
habitat health, but showed a high variation (181 in Site 2 vs. 67 in Site 5). Overall data
suggest that health conditions, based on IBI and QHEI, was better in the upstream
sites but the mercury bioaccumulation levels in the fish tissues were opposite. We
believe that measurements of various parameters are required for a diagnosis of
integrative ecosystem health.

영어초록

This research was a preliminary case study to determine the levels of total mercury
in the tissues of sentinel species (Zacco platypus) and ecological health in relation to
habitat characteristics and chemical conditions. We collected fishes in Gap Stream
during June~October 2007 and analyzed the total mercury from five types of tissues
such as liver, kidney, gill, vertebrae and muscle of Zacco platypus using Direct
Mercury Analyzer (DMA-80, US EPA Method 7473). Mean concentrations of total
[Hg], based on all tissues, was 67.2 and 20.7 μg kg-1, in the upstream and downstream
site, respectively, indicating 3 times greater level in the upstream. In other words,
the levels were higher in the pristine upstream than the downstream influenced by
the wastewater disposal plant. Chemical water quality, based on BOD, COD and nutrients
(TN, TP) showed that severe degradation occurred in the downstreams than the
upstreams. Index of Biological Integrity (IBI) using fish multi-metric model averaged
32, indicating a “good~fair” condition and varied from 42 (excellent~good) at
S2 to 22 (fair~poor) at S5 depending on the sites sampled. Qualitative Habitat
Evaluation Index (QHEI) in the all sites averaged 142, which was judged as “good”
habitat health, but showed a high variation (181 in Site 2 vs. 67 in Site 5). Overall data
suggest that health conditions, based on IBI and QHEI, was better in the upstream
sites but the mercury bioaccumulation levels in the fish tissues were opposite. We
believe that measurements of various parameters are required for a diagnosis of
integrative ecosystem health.

참고자료

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