This study investigated the seasonal and spatial distribution in species composition and numerical abundance of siphonophores in relation to environmental factors in the surrounding waters of Taiwan in February (winter) and May (spring) 2003 and August (summer) 2004. In total, 75 species belonging to 30 genera and 9 families were indentified, with the mean abundance of 387 ¡Ó 97 inds./100m3. The abundance of siphonophores showed clear seasonal change, higher in summer and winter, but lower in spring. The eight most dominant species were Lensia subtiloides, Chelophyes contorta, Muggiaea atlantica, Diphyes chamissonis, Bassia bassensis, C. appediculata, Abylopsis eschscholtzi and D. bojani, which together constituted 78¢H of the total siphonophores.
Siphonophores showed higher abundance in the waters of northwestern Taiwan, while the species number and diversity were higher in the waters of eastern and southern Taiwan. Different dominant species showed different distribution patterns, and most species were dominated by sexual generation. The siphonopores assemblages exhibited apparent seasonal variations and were associated with water masses. The siphonophores found in this study mostly belong to the widespread oceanic and coastal species, and the composition of dominant species was similar to the previous studies in the northern South China Sea.
The abundance of siphonophores showed significant negative correlation with salinity, while species richness and diversity were positive. Different predominant siphonophore species showed different correlationships with environmental factors; Muggiaea atlantica showed significant negative correlation with temperature, but Bassia bassnsis and Abylopsis eschscholtzi showed significant positive correlation with temperature. Most siphonophores were significantly and negatively correlated with salinity.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0630106-080613 |
| Date | 30 June 2006 |
| Creators | Yu, Shwu-Feng |
| Contributors | Meng-Hsien Chen, Chang-Tai Shih, Wen-Tseng Lo |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0630106-080613 |
| Rights | unrestricted, Copyright information available at source archive |
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