碩士 / 國立臺灣大學 / 生物環境系統工程學研究所 / 105 / The 1006 water quality datas including 11 kinds of water quality parameters were collected from 2006 to 2016 at Feitsui Reservoir. Also the 35 times fish community structures were investigated in these years including 9 water areas at Feitsui Reservoir. Multivariate statistical analysis was used to understand the relation between water quality parameters and fish species in different water temperature and different water area. The water area of Feitsui Reservoir were devided four parts, including upstream, midstream, downstream and all water area, and analyzed the relations between water quality factor and fish community structure of the every water area.
Principal component analysis (PCA) was used to analyze the water quality and to find major water quality parameters and influence factors of the reservoir. The fish community structures were analyzed by multidimensional scaling analysis (MDS), analysis of similarities (ANOSIM) and similarity percentage (SIMPER). We compared the fish community structure by three category including warm and cold water temperature, before and after 2010 as well as different years. We also used linier regression to find the relations between fish speices and water quality parameters.
The results of PCA showed that the water qualities of Feitsui reservoir were majorly affected by seasonly fluctuation of algae and the degree of Carlson trophic state index (CTSI) in diffent water area. The degree of CTSI decreased from upstream to downstream. The degree of CTSI was also the influence factor in up and mid stream. The influence factor of downstream was scour of surface soil of catchment area.
The results of fish community structures analysis indicated that the community structures of whole Feitsui reservoir were distinct from different years. This meant that fish community structures of Feitsui reservoir were unstable. The number of Carassius cuvieri in particular fluctuated. In midstream water area, Cichlasoma managuense should be kept under observation because the increasing number of Cichlasoma managuense changed the fish community structures in 2016.
The relations between fish standing crop and water quality indicated that tilapias (Oreochromis sp.) had positive relation with chlorophyll-a in upstream and midstream water area. It means that tilapias could affect water quality negatively. In downstream water area, bighead craps (Aristichthys nobilis) had negative relation with algal biomass and chlorophyll-a. It means that bighead craps could clean up the algae in downstream water area.
| Identifer | oai:union.ndltd.org:TW/105NTU05404001 |
| Date | January 2017 |
| Creators | Shen-Yun Fan, 范慎芸 |
| Contributors | 侯文祥 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 108 |
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