碩士 / 國立中興大學 / 昆蟲學系所 / 102 / Dams would affect streams by disturbed their flow continuity and the transportation of power in ecosystem. The purpose of this study is to investigate the influence
among different dams (check dam and debris dam), location (upstream and downstream), stage (before and after dam removed) and five levels (aquatic insects number, taxon number, diversity, founctional feeding group and biological feature) in mountain streams. The experimental dams were located upstream of the Cijiawan Stream and Gaoshan Stream in Daja River. There are two sample site within each dams (upstream and downstream). Base on the removal date of the two dams, we collected samples respectively one year before and after dams removed from august 2010 to june 2013. Aquatic insects were collected by Surber''s sampler and then the taxon and individual number would be completely identified and recorded. The result shows that the individual numbers of aquatic insect in check dam were higher than debris dam but the taxon numbers were not. However, the individual numbers of aquatic insect both decrease in the two dams. The diversity index decrease rapidly after check dam removed. The functional feeding group of aquatic insects also had been affected by removal of the two dams. Nevertheless, the result of contribution percentage of check dam were all contrary to debris dam except shredders. According
to the result of MDS, the community structure of aquatic insect could be separated into two groups (check dam and debris dam). On the other hand, the result of nested
ANOVA shows that the individual numbers of short-lived aquatic insects would decrease by the impact of check dam removing but debris dam was not.
| Identifer | oai:union.ndltd.org:TW/102NCHU5185015 |
| Date | January 2014 |
| Creators | Che-Chang Lin, 林哲樟 |
| Contributors | 郭美華 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 41 |
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