碩士 / 國立中興大學 / 生命科學系所 / 94 / This research was conducted in order to ascertain the species diversity of the genus Euprymna in Taiwan. In the genus Euprymna the species identity of males can be determined based on the arrangement of the enlarged arm suckers, however, the enlargement of arm suckers does not occur in females. Therefore, one of the aims was to find characters useful for species identification of females of the genus. From the arrangement of the enlarged arm suckers in males, two species of Euprymna, E. berryi and E. morsei are found to occur in Taiwan. Genetically, intraspecific gene identity divergence in COI gene or 16S rDNA is above 0.992, and COI gene identity divergence between E. berryi and E. morsei is 0.878 ± 0.002, 16S rDNA divergence is 0.911 ± 0.002, the divergence of combined COI and 16S rDNA between species is 0.893 ± 0.001. In the reconstruction of phylogenetic tree, the specimens of E. berryi and E. morsei form two monophyly that is congruent with the morphological characters used in male and female. These data confirm that E. berryi is the species that has many chromatophores on the ventral surface of the fins and E. morsei has not. The two species can also be distinguished based on the fine structure of the ring-like patterns on the tentacular sucker rings, the central opening of the ring-like patterns is absent or with a small opening in E. berryi, while that in E. morsei is clearly visible. In terms of their distribution in Taiwan, E. berryi is distributed in the northeastern region and the west coast of Taiwan, while E. morsei is found in the northeastern area of Taiwan only. The relative dimensions of the two species are similar that makes the discriminate analysis result unless in distinguishing E. berryi and E. morsei. Due to the inconsistent presence of E. morsei during the study period, only the reproductive cycle of E. berryi is studied. The result indicates time of E. berryi females spawned in March and December. It is also found that both mature and immature eggs exist in the ovary of mature females and the mated females. It is concluded that the eggs are not mature simultaneously and the females are multiple spawners.
| Identifer | oai:union.ndltd.org:TW/094NCHU5105022 |
| Date | January 2006 |
| Creators | Chiu-Ping Huang, 黃秋平 |
| Contributors | 盧重成 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 90 |
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