Feasibility of Applying Index of Stream Condition (ISC) on Torrents in Taiwan
Date Issued
2009
Date
2009
Author(s)
Wong, Mu-Han
Abstract
There are many kinds of assessments on ecological habitat of stream due to the different regions and localities. This study targeted at torrents, which have less contamination and more ecological potential restoration comparing with downstream ones and chose Index of Stream Condition, developed by the State of Victoria in Austria, which is included in physical, chemical and botanical indexes and easier use for engineers, especially. In which, The Aquatic Life Sub-index is modified by this study and is represented by fish species.y Stepwise Regression Analysis in Multiple Regression Analysis, the prominent habitat factors could be depth, area, volume , substrate diversity, pH , electrical conductivity and elevation as well as the relationship between these factors and fish length and its density. The result of statistic analysis showed that the relation between these prominent factors and the variety of body length and density of endemic fish species are significant. According to this result, the assessment of Aquatic Life Sub-index was modified for torrents in Taiwan.en torrents in Taiwan were assessed by the modified method, and the results were compared with Tsai’s one (2006). The comparison showed that the modified method by this study reflect the better result than Tsai’s one. And, the modified method can avoid rejecting the ecological conditions of torrents totally as no finding endemic fish species. oreover, the investigation time and its frequency could be setup in each season in March, June, September and December. Besides, the criteria of Index of Stream Condition on torrents in Taiwan could be 31. In which, the index below 31 represents the worse habitat for endemic fish species while above 31 represents a better condition.
Subjects
Index of Stream Condition
Multiple Regression Analysis
Stepwise Regression Analysis
Torrent
Type
thesis
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