碩士 / 國立臺灣海洋大學 / 環境生物與漁業科學學系 / 104 / Many evidences have suggested that marine life have cryptic species which may led to ignorance of the real marine biodiversity in the world and will often render any conservation and management plan for fishery target species inappropriate. One such group is the Cephalopods. Several Cephalopod species have proved to have different cryptic species by molecular genetics and biotechnology methods. Bigfin reef squid, Sepioteuthis lessoniana, are widely distributed in the Indo-Pacific region with high economic values. However, we don’t know much about their population genetic structure. This information is the key point for their resources management, sustainable utilities for fishery.
Our results by COI sequences indicates that there are three cryptic lineages of Sepioteuthis lessoniana in Taiwan. All the lineage pairs have a p genetic distance high than 10% which may suggest a species level. Lineage A are major found in tropical southern Taiwan; Lineage B are major in west and north Taiwan; while Lineage C can be found in all regions of Taiwan. Lineage B and C are sympatry major in Keelung. Both neutrality tests and mismatch distribution all suggested that Lineage A and B have been experienced a bottleneck then a population expansion in their evolutionary history. Lineage C, however, have no obvious population expansion but a sympatric sub-lineages. All the lineages have a sub-lineage structure according to their distribution: Lineage A has A1 and A2 sub-lineages; Lineage B has B1, B2 and B3 sub-lineages; Lineage C has C1, C2, C3 and C4 sub-lineages. The hatching month back calculated from statolith suggested that there is no hatching month difference between Lineage B and C, probably a spring and an autumn cohort, which may due to the smaller sample sizes or other spawning isolation mechanisms. Our results suggested that as high diversity as the bigfin reef squid population in Taiwan, they should be managed separately as independent units for sustainable fishery uses.
| Identifer | oai:union.ndltd.org:TW/104NTOU5451003 |
| Date | January 2015 |
| Creators | Wang, Ya-Hsien, 王雅嫺 |
| Contributors | Wang, Chia-Hui, Shen, Kang-Ning, 王佳惠, 沈康寧 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 51 |
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