碩士 / 國立臺灣海洋大學 / 海洋生物研究所 / 100 / The marine real algal members within the Laurencia complex are widely from temperate to tropical regions. The taxonomic system has been traditionally based on external and branching morphologies as well as the arrangement of the secondary pit-connections among cortical cells. Four genera and twenty four species within the Laurencia complex were previously recorded from Taiwan, but some had shown to be synonym and misidentification. In this study, I used rbcL sequence analysis to delineate the species within the Laurencia complex from Taiwan. The molecular analyses showed that the Laurencia complex were clustered into three evolutionary lineages and fourteen species, including 1) ten species of Laurencia (L. composita, L. okamurae, L. obtusa var. densa, L. brongniartii, L. obtusa var. dendroidea, L. tropica, L. flexilis, Laurencia sp. 1, Laurencia sp. 2, Laurencia sp. 3 ); 2) two species of Palisada (P. perforata, P. parvipapillata), and 3) two species in Chondrophycus (C. dotyi, Chondrophycus sp. 1 ). Nine previously recorded speices were comfirmed in this study, including L. composita, L. okamurae, L. obtusa var. densa, L. brongniartii, L. obtusa var. dendroidea, L. tropica, P. perforata, P. parvipapillata, C. dotyi. On the other hand, the fourteen previously recorded species are not found in this study, including C. undulatus, C. cartilagineus, C. glandulifer, L. nipponica, L. forsteri, L. hamata, L. intricata, L. nangii, L. pinnata, L. pannosa, L. venusta, P. concreta, P. intermedia, P. robusta. Among those previously recorded species, some might be due to mididentification or some might be occurring seasonally and were not found during this short period of study. L. tropica and L. flexilis share a similarity of the external morphologies, and both species were regarded as the same species in previous records. The molecular analyses showed that L. flexilis from Taiwan is different from L. tropica. The former is a new record to Taiwan’s marine flora. In addition, P. intermedia from Taiwan including several different species (L. composita, L. okamurae, L. obtusa var. densa, L. obtusa var. dendroidea and three unidentified species), and the record of Osmundea in Taiwan might be a misidentification of L. brongniartii.
The species diversity of Laurencia is shown to be the highest in southern Taiwan, including thirteen species (L. composita, L. okamurae, L. obtusa var. densa, L. brongniartii, L. obtusa var. dendroidea, L. tropica, L. flexilis, Laurencia sp. 1, Laurencia sp. 2, Laurencia sp. 3, P. perforata, P. parvipapillata, C. dotyi), whereas there are six species in the north (L. composita, L. okamurae, L. brongniartii, P. parvipapillata, C. dotyi, Chondrophycus sp. 1). three species in the east (L. brongniartii, L. flexilis, P. perforata) and five species（L. brongniartii, L. tropica, L. flexilis, P. perforata, P. parvipapillata）are occurring in the Green island and Orchid island.
| Identifer | oai:union.ndltd.org:TW/100NTOU5270017 |
| Date | January 2012 |
| Creators | Yu-Hao Chang, 張宇豪 |
| Contributors | Showe-Mei Lin, 林綉美 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 164 |
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