碩士 / 國立中山大學 / 海下科技研究所 / 103 / This study was conducted to understand the relationship of coral reefs coverage rates to the hydrographic environments and benthic habitats at Penghu Southern Four Islands. Field observations were conducted in 2012 using hydrographic instruments and a tow camera at 13 selected sites. Analysis of observed data revealed that the currents were dominated by tides, southward in ebb and northward in flood. The surface water temperature was 24℃ in May and 27℃ in September, and is about 20℃ in both season near the bottom. Salinity ranged 32.7~34.6‰, which mostly originated from SCS. The geology background of southern Penghu was volcanic basalt. The observed benthic types were dominated by rock in the shallow water around the islands. Sandy bottom and gravel/pebbles were observed in the deeper water. The bottom habitats were mainly hard corals in the rocky substrate. A few soft corals can be found in the deeper gravel bottom. Statistics suggest that the bottom coverage rate of corals is related to water depth (light). It appears that the coral reef grows very well in the rocky bottom at less than 30 m. EOF analysis using parameters including coral reefs coverage rate, hydrographic data, and benthic habitats. The resulting first EOF mode shows that the hard corals and soft corals are negatively correlated with current speed. PCA analysis shows that the second mode is highly correlated with the occupation of hard corals. The water depth and rocky bottom are major factors controlling the coverage rates of hard corals.
| Identifer | oai:union.ndltd.org:TW/103NSYS5281007 |
| Date | January 2015 |
| Creators | Li-ting Huang, 黃莉婷 |
| Contributors | Yu-Huai Wang, 王玉懷 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 76 |
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