碩士 / 國立東華大學 / 海洋生物多樣性及演化研究所 / 95 / Natural hybridization is not uncommon in fish. It occurs when fishes spawn at the same time and space. The present study investigates the hybridization among three close species in genus Acanthopagrus: A. schlegelii, A. berda, and A. latus, using artificial fertilization with cryopreserved sperm. All crosses from different species were fertilizable and hatchable. The fertilization rate（75.41±3.00% ~ 86.11±1.39%）and hatching rate（56.72±5.17% ~ 67.11±6.06%）between the closest phylogenetic relationship, i.e. A. schlegelii × A. berda, are significantly higher than other interspecific crossings. Fertilization rates from crosses between distant species, such as A. latus × A. berda（21.94±6.15% ~ 24.97±5.92%), and A. latus × A. schlegelii（11.61±1.54% ~ 34.54±4.62%), are significantly lower than others. The results coincided with the interspecific phylogenetic relationships of genus Acanthopagrus, implying that post-mating isolation mechanism is related to phylogeny. Since there are overlapping in mating season, geographical distribution, and ecological characteristics between A. schlegelii and A. berda, hybrids from accidental fertilization is probable.
Furthermore, we confirm that the population of A. berda from Dapeng Bay is a valid species (A. Taiwanensis) that is closest to A. berda in terms of genetic structure. More studies are needed to examine whether it can hybrid with other congeneric species.
| Identifer | oai:union.ndltd.org:TW/095NDHU5270006 |
| Date | January 2007 |
| Creators | Jen-Wei Kuo, 郭人維 |
| Contributors | Pei-Jie Meng, Jeng-Ping Chen, 孟培傑, 陳正平 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 81 |
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