碩士 / 國立中山大學 / 海洋科學系研究所 / 107 / Massive poritids often reached very large colony sizes in many Pacific reefs. A few hypotheses have been proposed and tested in this on-going study. I observed that the massive Porites spp indeed reached largest colony sizes at Dongsha Atoll; within habitats, however, the same is true only in seagrass beds, patch reefs and channels, but not in fore reefs. I mentioned two questions: (1) how come massive Porites could reach large sizes in seagrass beds while the other massive corals could not? I proposed six hypotheses to test the mechanisms causing the difference of colony sizes between species, i.e., faster extension rates, lower mortality rates, earlier colonization, secondary colonization, high abundance, and superior competitivity. The results suggest that the extension-rate hypothesis contributed but could not fully explain the differences in colony sizes among species and the other hypothesis is secondary colonization. Reject lower mortality rates, earlier colonization, high abundance, and superior competitivity. (2) how come Porites differ in size among habitats? There are three hypotheses to test faster extension rates, stable habitats and lower competition pressure and they are supported currently. In summary, the environments of seagrass beds are high sediments and highly varied in temperature and Porites can remove the sediments and endure temperature so that exist in secondary colonization way, living on the sands. The other corals can’t live when removing from the sands. Moreover, the extension rates of Porites are faster than the others so we can observe the larger colony sizes of Porites in the seagrass beds. Also, larger Porites exist in the low distributions and less competition pressure environments, conversely not.
| Identifer | oai:union.ndltd.org:TW/107NSYS5276011 |
| Date | January 2019 |
| Creators | Hsiang-Lun Huang, 黃湘倫 |
| Contributors | Keryea Soong, 宋克義 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 78 |
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