碩士 / 國立臺灣海洋大學 / 海洋生物研究所 / 101 / Two genera and thirteen species of the Ulvaceae have been recorded from Taiwan. Based on thallus morphology, the species can be grouped into two types: 1) Blade-type: thalli composed of two-celled layers; 2) Tubular-type: thalli composed of a single celled layer. In the past, the taxonomic studies on the Ulvaceae from Taiwan were largely based on morphological observations resulting some taxonomic confusion and synonymy. In this study, the taxonomy of the Ulvaceae is revised based on comparative anatomy and the inter-specific relationships are inferred using rbcL sequence analyses. The molecular analyses showed that there are thirteen species identified, which are grouped into three, evolutionary distinct clades: 1) tubular-type “Ulva” clade: containing seven species, “U.” prolifera and “U.” linza and five undetermined species (“Ulva” sp. 1, “Ulva” sp. 2, “Ulva” sp. 3, “Ulva” sp. 4 and “Ulva” sp. 5); 2) Ulva / Umbraulva/Gemina/Percursaria/Ulvaria complex: composed of three species, Um. amamiensis, Um. taiwanensis sp. nov. and one undetermined species with tubular form (Ulva sp. 6); 3) blade-type “Ulva” clade: including three species, “U.” fasciata, “U.” ohnoi and “U.” spinulosa, which thalli are in either grass-green or in light-green.
The previous records “Ulva” prolifera, “U.” linza and “U.” fasciata from Taiwan are confirmed, whereas one new species of Umbraulva, Um. taiwanensis is discovered and Umbraulva amamiensis, “U.” ohnoi and “U.” spinulosa are newly recorded from Taiwan. On the other hand, the previous record of “U. conglobata” could be “U.” spinulosa, whereas “U. lactuca” is not present in Taiwan and is a mixture of “U.” ohnoi and “U.” spinulosa. The molecular analyses also indicated that “U. pertusa”, “U. rigida” and “Um. japonica” are not occurring in Taiwan, but are molecularly identical to Um. amamiensis from Japan. In addition, the study found that the six undetermined species may be new species of the world, but need other species of seaweeds detailed comparisons. The five species, U. clathrata, U. compressa, U. intestinalis and U. angusta, are not detected in this study and can be misidentification of other species. The distribution of the species of the Ulvaceae found in Taiwan and their phylogenetic relationships with related species worldwide are also discussed in this study.
| Identifer | oai:union.ndltd.org:TW/101NTOU5270011 |
| Date | January 2013 |
| Creators | 黃騰毅 |
| 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 | 156 |
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