碩士 / 國立嘉義大學 / 生物資源學系研究所 / 97 / Streams in the mountainous regions of Taiwan are often modified by series of artificial embankments and low dams to reduce the risk of bank erosion after heavy rain. However, these artificial structures change stream habitats and factors affecting periphyton. The purpose of this study was to study the effects of grazers and nutrients on periphyton in both stream sections. We used microcosm experiments to manipulate grazer and nutrient in the natural and engineered sections of Huo-Pei-Keng stream in Lian-Hua-Chi region of Nantou County of Taiwan.
In the natural stream section, experimental results indicated that periphyton biomass significantly decreased when grazers were present, but nutrient addition had no effect on periphyton and interaction effect was not present. In the engineered stream section, grazers and nutrients had no significant effect on periphyton. However, we found that tadpoles decreased periphyton biomass, while other grazers did not reduce periphyton. The shade treatment decreased periphyton biomass. In the natural stream section, the dominant algae were Achnanthes spp. and the major groups of periphyton were monoraphid and biraphid diatoms. In the engineered stream section, the dominant algae were Oedogonium spp. or Ulothrix spp. and the major groups were filamentous green algae and araphid diatoms. Relative biovolumes of Melosira spp. decreased when grazers were present. In the engineered section, the shade treatment had less percentage of filamentous green algae and monoraphid diatoms than the non-shade treatment.
| Identifer | oai:union.ndltd.org:TW/097NCYU5404001 |
| Creators | Shih-En Dai, 戴士恩 |
| Contributors | Koa-Jen Jong, Yi-Kuang Wang, 鍾國仁, 王一匡 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 0 |
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