The first part of the 2nd year project was to investigate and to monitor the quality of the aquatic quality and ecology of Shihmen Reservoir watershed. A total of 12 sample sites from the upper, middle and lower reaches of Baishi Stream, Kala Stream, Xiayun Stream, and Yixing Power Plant were selected for monitoring, and aquatic habitats and biological features were collected during May 2010 and December 2011 (twice in both the dry and wet seasons). We recorded 12 species of fish from 4 orders and 6 families, 43 species of aquatic insects from 8 orders and 30 families, 4 species of benthic organisms from 2 orders and 4 families, 89 species of attached algae from 16 genera and, and 53 species of aquatic plants from 30 orders. In comparison with the 1st year monitoring results, turbidity and suspended solids were the two water quality factors most influenced by construction. Fish and aquatic insects were used as indicator organisms, and nine habitat assessment indicators were chosen to assess ecological quality. The result suggested that the ecological status were stabilizing, and that the Rapid Bioassessment Protocol III (RBPIII) aquatic insect index, the Citizen’s Qualitative Habitat Evaluation Index (CQHEI), and the Rapid Bioassessment Protocol (RBP) stream habitat assessment index were most sensitive to constructions. In addition, the operational experiences during the two year project have shown that the current methods in evaluating aquatic habitat were practical and adaptable. The results can also feedback to improve later engineering work.
The second part of the project was to modify the “Ecological Survey & Assessment Specification on the catchment area of Reservoir” handbook drafted by the Water Resources Agency. By demonstrating 6 trial cases in Shihmen, Tseng Wen and Nanhua Reservoir, several modifications of procedures have been made for broader applications. The revised handbook is presented in this report which is applicable to any reservoir catchment in Taiwan and should be applied wherever constructions and management may impact the natural habitats, especially where ecologically sensitive areas may be affected.
Keywords: The conservation and management project, the ecological assessment of the construction, applied ecology