碩士 / 國立成功大學 / 水利及海洋工程學系碩博士班 / 100 / Catastrophic typhoons with heavily rainfall bring massive flow and fine sediments in stream channels. In addition, the natural disturbances and engineering construction after typhoon change fish abundance and their living environment. This study compared physical habitat parameters, substrate component types, fish abundance and composition by two periods of sampling (2008.11~2009.3, 2011.5~2012.3.). Study area was in Cishan River, a tributary of the KaoPing River, in the southern Taiwan. Two strong typhoons attacked study area between two study periods. The collected species were Hemimyzon formosanus, Rhinogobius nantaiensis, Onychostoma alticorpus, Cadidia barbata, Acrossocheilus paradoxus and Spinibarbus hollandi. Our results showed significant decrease of substrate size. The size and weight of most fish species were smaller than before the typhoons. The river channel reformed after heavy rains and indicated an unstable condition. Major habitat types changed from riffle with coarse substrate to run with fine substrate in both two sampling stations. The results of t-test and Pearson’s correlation indicate the different effects of habitat requirements of three major study fish species. Critical habitat requirements are requirements that have insignificant results in t-test. It means the range of fish specie’s requirements do not change between two study periods. General habitat requirements are requirements that influence to fish in both study periods, although the range may change. Tolerable habitat requirements are requirements that have no significant effects in both study periods, even the range changes after the typhoon. Adult H. formosanus’s critical habitat requirements are water depth and percent of cobble in the substrate while juvenile do not have critical habitat requirements. Adult R. nantaiensis’s critical habitat requirements are water depth, percent of cobble and fine particle in the substrate while juvenile does not have critical habitat requirements. No adult O. alticorpus was captured after typhoons for habitat requirement analysis. However, juvenile O. alticorpus’ critical habitat requirements are mean and standard deviation of flow velocity. Understanding the function of the habitat requirements can provide some useful information in restoration after the disaster and contribute in minimizing the effects of river engineering.
| Identifer | oai:union.ndltd.org:TW/100NCKU5083096 |
| Date | January 2012 |
| Creators | Pin-HanChen, 陳品翰 |
| Contributors | Jian-Ping Suen, 孫建平 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 109 |
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