碩士 / 國立臺灣海洋大學 / 水產養殖學系 / 107 / Hard clam (Genus Meretrix) is an important aquaculture bivalve in Taiwan. However, in recent years, a large number of mortality events often occur, and it is speculated that caused by inbreeding. Also, Taiwanese hard clam has long been regarded as an alien species, introduced from Japan by the Japanese during the Japanese colonial period, belonging to the Meretrix lusoria. Therefore, to clarify the taxonomy state and genetic diversity (inbreeding) of Taiwanese hard clam, cultured and wild samples were investigated by using morphology and mtDNA COI sequences. The samples included: (1) cultured samples from 12 locations in Taiwan; (2) wild samples from 3 locations in Taiwan; (3) wild samples from 14 locations in foreign (China, Philippines, Thailand, Malaysia, Indonesia). This study found that: (1) Taiwanese hard clam (Meretrix sp.) show inbreeding depression in some locations. However, the whole Taiwanese hard clam still has a high level of genetic diversity. (2) Taiwanese hard clam (Meretrix sp.) is not Meretrix lusoria (Japanese hard clam), it is a native species of Taiwan, and it should be regarded as a new species distributed from the Yangtze River estuary in China to Indonesia in the south. (3) The species of the genus Meretrix have multiple cryptic species and need to be further clarified. For example, Meretrix lyrata (Southeast Asia), should have at least two species; Meretrix meretrix (the Asia Pacific and the Indian Ocean) should be at least two species. (4) Meretrix tigris (Tiger hard clam) should be only a special pattern type, belonging to the Taiwanese hard clam (Meretrix sp.)
| Identifer | oai:union.ndltd.org:TW/107NTOU5086006 |
| Date | January 2019 |
| Creators | Chuang, Chao-Hsi, 莊朝喜 |
| Contributors | Hsu, Te-Hua, 徐德華 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 36 |
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