碩士 / 國立彰化師範大學 / 生物學系 / 102 / Dichotomaria belonged to Galaxauraceae (Nemaliales) is widely distributed in tropical, subtropical, and temperate coastal area. Dichotomaria marginata complex is one of the groups that show wide range of morphological variations, resulting in few recognized species. There was two species, D. latifolia (= Galaxaura latifolia) and D. elegans (= G. elegans) recorded morphologically similar to D. marginata in Taiwan. In this study, we try to use plastid rbcL gene, cox1 and cox2-3 gene to clarify the phylogenetic relationships and population structure of D. marginata complex in Taiwan. Based on the rbcL sequence, our data analysis revealed four species of Dichotomaria such as D. marginata, D. latifolia, D. elegans and D. spathulata, and two genotypes of D. elegans. Furthermore, the population structure analysis using the partial cox1 sequence and the spacer of cox2 and cox3 (cox2-3) showed that D. elegans can be grouped into two distinct lineages, southern and northern populations, in Taiwan. The northern group located in the region where the Kuroshio Current pass and the other one located in the southern Taiwan. In this study, we also discuss the possible mechanism of the species diversification of D. elegans.
| Identifer | oai:union.ndltd.org:TW/102NCUE5112027 |
| Date | January 2014 |
| Creators | Pei-Hsuan Lai, 賴珮瑄 |
| Contributors | Wei-Lung Wang, 王瑋瓏 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 58 |
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