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Tuesday, June 5, 2007 - 9:15 AM
112
Biomonitoring with stream macroinvertebrates in the Republic of China and a case study from Central Taiwan
Y-K. Wang, Center of General Education and Graduate Institute of Environmental Management, Nan-Hua University, Chia-Yi County, 62248, Taiwan, Tz-Wen Liu, Graduate Institute of Environmental Management, Nan-Hua University, Chia-Yi County, 62248, Taiwan, and Jiunn-Jei Wu, Department of Environmental Engineering and Science, Feng-Chia University, No. 100 Wenhwa Rd., Seatwen, TaiChung City, 40724, Taiwan.
Taiwan has a short history of the study of stream macroinvertebrates for biomonitoring. The study of taxonomy of stream macroinvertebrates started by Japanese in early 20th century, while using stream macroinvertebrates for biomonitoring was initiated by researchers and environmental bureau in 1970’s. However, the use and analysis of macroinvertebrates data have not been effective.
The purpose of this case study was to understand the relationship between stream macroinvertebrates and environmental variables in agricultural Central Taiwan. Our results showed that there were significant relationships among macroinvertebrates, water quality, and habitat. TP was positively correlated with SS and % dominant taxa and negatively correlated with epifaunal cover, embeddedness, velocity/depth regime, channel flow status, bank stability, total number of taxa, number of EPT taxa, and Shannon-Weaver diversity. DO was positively correlated with epifaunal cover, riffle frequency, and % EPT and negatively correlated with conductivity, NO2, BOD, and % Chironomidae.
According to their relationships with standardized water quality and habitat variables, we selected four metrics, which were total number of taxa, number of EPT taxa, Shannon-Weaver diversity index, and percentage of intolerant organisms, for multimetric index development. This index can be applied to assess the ecological status of streams in agricultural Central Taiwan.
The purpose of this case study was to understand the relationship between stream macroinvertebrates and environmental variables in agricultural Central Taiwan. Our results showed that there were significant relationships among macroinvertebrates, water quality, and habitat. TP was positively correlated with SS and % dominant taxa and negatively correlated with epifaunal cover, embeddedness, velocity/depth regime, channel flow status, bank stability, total number of taxa, number of EPT taxa, and Shannon-Weaver diversity. DO was positively correlated with epifaunal cover, riffle frequency, and % EPT and negatively correlated with conductivity, NO2, BOD, and % Chironomidae.
According to their relationships with standardized water quality and habitat variables, we selected four metrics, which were total number of taxa, number of EPT taxa, Shannon-Weaver diversity index, and percentage of intolerant organisms, for multimetric index development. This index can be applied to assess the ecological status of streams in agricultural Central Taiwan.
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See more of The NABS 55th Annual Meeting