碩士 / 國立中山大學 / 海洋生物科技暨資源學系研究所 / 96 / Temporal and spatial distribution in species composition and abundance of hydromedusae in relation to hydrographic variables in the waters surrounding Taiwan were investigated from February to November, 2004. A total of 101 species belonging to 65 genera and 34 families hydromedusae were identified, with the mean abundance of 557 ± 90 inds./1000m3. The abundance of hydromedusae showed no significant seasonal change but generally was higher in spring and fall, and lower in summer. The eight dominant species were Aglaura hemistoma、Solmundella bitentaculata、Eutima levuka、Liriope tetraphylla、Aglantha elata、Laodicea indica、Rhopalonema velatum and Sminthea eurygaster, which together contributed 85% of the total hydromedusae.
Hydromedusae showed higher abundance in the waters northwest off
Taiwan, while the species number and diversity were higher in the waters east and south off Taiwan. Hydromedusa communities showed significant difference among water masses, higher abundance in China Costal Current, meanwhile higher species number and diversity in Kuroshio Current. Different dominant species showed different distribution patterns. The total abundance of hydromedusae showed no significant correlation with temperature or salinity, but were positive correlated with zooplankton abundance, while species richness were negatively correlated with zooplankton abundance. Different dominant hydromedusae species showed different correlationships with environmental factors; Aglaura hemistoma showed significant positive correlation with salinity, but Solmundella bitentaculata showed significant negative corelation with salinity. The correlationship between the abundance of each dominant species and evironmental factors varied seasonally.
| Identifer | oai:union.ndltd.org:TW/096NSYS5270021 |
| Date | January 2008 |
| Creators | Wan-chun Chang, 張萬鈞 |
| Contributors | Wen-Tseng Lo, 羅文增 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 153 |
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