碩士 / 國立中山大學 / 海洋科學系研究所 / 106 / Giant clams (Subfamily: Tridacninae) are common species in coral reefs which also have high commercial values. Due to overfishing, they are listed in CITES for protection need. This study was conducted to investigate the distribution of giant clams in Taiwan and the correlation of shell growth ring and water temperature. The results showed that Dongsha had the highest density (1.11 N/100 m 2), and no giant clams were found in Keelung and Taipei counties. Tridacna maxima were the most widely distributed species, and the highest density area was in the Green Island protected area. The size of the same species was smaller and distributed shallower in Taiwan than the ones in adjacent islands. In addition, Hippopus hippopus was only found in Taiping Island. Because shell growth rings are correlated to periodic water temperature changes, it is also used in paleoclimate studies. Here, the Mutvei’s staining method was used to examine the correlation of water temperature and shell growth rings, including the inner layer, outer layer and hinge plate. The results show that the numbers of growth ring in the three parts were consistent. Therefore, it is suitable to examine large samples by hinge plate. The growth rings were more obvious when the range of water temperature changes were large. If changes of water temperature have annual periodicity, the age of giant clams can be estimated by growth rings.
| Identifer | oai:union.ndltd.org:TW/106NSYS5276015 |
| Date | January 2018 |
| Creators | Hei-Nin Kwong, 鄺禧年 |
| Contributors | Li-Lian Liu, 劉莉蓮 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 56 |
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