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Native Benthic Algae as Bioindicators for Water Quality of River
優勢藻類指數-RDAI 值(River DominantAlgae Index)，可經由計算此三
In this study, the relationship between the benthic algae (included epilithic and epipelic algae) and the ecological environmental factors in rivers of Taiwan were investigated. Samples were collected monthly from seventeen samplingstations for one year. For applying the algal species as bioindicators, the algal flora, ecological diversity, community similarity and seasonal successionchange were studied. In addition, the algal communities grown on different artificially attached substrates culture on riverbed were also studied. The technology of energy dispersive x-ray spectrometer was introduced to analyze theheavy metal elements of attached algae growing in varios polluted rivers. A total of 178 species from 180 samples were identified using light microscopyand scanning electron microscopy. It included 98 species of diatoms (which show55 % of total algae), 42 species of green algae, 19 species of blue-green algae, and 19 species of euglena. For suggesting which algal species as bioindicators, the dominant species of various benthic diatoms were described the valvestructure using the scanning electron microscopy especially. Fifty-one dominantspecies achieved a relative abundance higher than 20% in the epilithic or epipelic algal assemblages. On the basis of principal components analysis (PCA)and factor analysis (FA), we found 51 algal components which could be separatedinto three ecological dominant communities including pollution- tolerantspecies, unpollution-tolerant and moderate pollution- tolerant species. It wassuggested that RDAI index (River dominant algae index), modified from DAIpo(Diatom assemblage index of organic water pollution), and calculate the RDAI index from these three ecological dominant communities, could assses the water quality. Through the statistical analysis of stepwise multiple regression analysis(SMRA), some species of benthic show higher than 5% abundance could predict the water quality about 82.9-89.8% explanation. Besides, it was foundthat the little white stone was best fit for the test of artificially attached substrate andthe algae grown on it could easily be observed under the SEM.
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