碩士 / 國立臺灣大學 / 海洋研究所 / 95 / Isopora palifera inhabits the upper subtidal reefs where physical disturbances such as temperature and light intensity are high. In this thesis, I examined the temporal and photophysiological variations of symbiont communities in I. palifera.
Monthly variation of Symbiodinium phylotypes in I. palifera collected from March 2006 to March 2007 indicated a significant seasonal fluctuation, a consistent pattern was also observed in the samples collected from January 2000 to July 2001 in Tantzei Bay, Kenting. Nevertheless, the dominant phylotype was completely shifted from Symbiodinium D to Symbiodinium C between these two sampling periods. This reshuffling provides the evidence that symbiont communities in I. palifera could return to the dominance of “cosmopolitan” Symbiodinium C, as seen in most of the Indo-Pacific corals, during the non-bleaching period. Whereas I. palifera shuffled the dominant symbiont to the thermal-tolerant phylotype D during the recovery period right after the mass coral bleaching in 1998 and 1999.
Photophysiological responses measured in situ by Diving-PAM indicated that the tagged coral colonies showed a significant drop of maximum quantum yield (Fv/Fm) in July 2006. This drop may reflect the photoinhibition of Symbiodinium when seawater temperature and light intensity reached their threshold during summer. In contrast, the maximum reshuffling of Symbiodinoum phylotypes occurred in September (C phylotype reduced from 66.7% to 25%, but C+D phylotype increased from 33.3% to 75%). This time lag supported the scenario that phylotype reshuffling did not necessarily come with spontaneous photophysiological response. This result also implied that symbionts could provide stable energy source to the host with different symbiont compositions, and reducing photosynthetic capacity might trigger phylotype reshuffling in I. palifera.
| Identifer | oai:union.ndltd.org:TW/095NTU05274031 |
| Date | January 2007 |
| Creators | Chia-Min Hsu, 許嘉閔 |
| Contributors | Cgao-Lun Chen, 陳昭倫 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | en_US |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 24 |
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