碩士 / 國立臺灣大學 / 海洋研究所 / 101 / The East China Sea (ECS) possess extensive continental shelf and fishing grounds in eastern Asia. The seasonal monsoon caused some variations of water currents succession and complicated climatic condition. Input of fresh water from Changjiang (CJ) attribute to nutrient-rich condition at the adjacent areas of the estuary. In this research, oceanographic survey was conducted across the inshore-offshore transects to collect all of the environmental factor and demersal fish samples. The increasing of fresh water input, due to the Changjiang flood in 2010, which may affect the marine ecosystem was evaluated in this study.
Totally, 7992 demersal fish including 126 species were collected in Cr. 905, Cr. 932 and Cr. 966. The demersal fish species composition of each station was examined. The highest similarities for CLUSTER and nMDS similarity were found in the same station among the years. Dissolved oxygen at the bottom is positively correlated to the surface salinity, but negatively correlated to nitrate and chlorophyll a concentration.
Fish species composition varied greatly between each station, especially inshore and offshore sites. This result implied that the fish communities were influenced by ecosystem heterogeneity and the environmental conditions. Higher diversity appeared at offshore sites that have higher dissolved oxygen and diverse habitats. The effects of anthropogenic activities to the ECS ecosystem needed a long-term observation.
| Identifer | oai:union.ndltd.org:TW/101NTU05279013 |
| Date | January 2013 |
| Creators | Yu-Ting Chiu, 邱鈺婷 |
| Contributors | Jen-Chieh Shiao, 蕭仁傑 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 70 |
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