碩士 / 國立東華大學 / 海洋生物多樣性及演化研究所 / 98 / The majority of research on the response of corals to temperature has been conducted with consideration to stable temperatures. Although studies show that seawater temperature can be highly variable on coral reefs, much is still unknown about the physiological response of coral to temperature fluctuations. In NanWan Bay, southern Taiwan, temperature variation due to upwelling by internal tides is common, and seawater temperature can change as much as 3 - 10 °C in a 24h period in summer. In contrast, on the west coast of Taiwan, where there is no upwelling, and temperature is relatively stable. In order to examine the effects of stable and fluctuating temperatures on coral from different physical environments, we completed a one-week manipulative temperature experiment using the common brooding coral, Seriatopora hystrix, from two different environments of Houbihu (NanWan Bay) and Houwan (West Coast). Corals were either exposed to a stable (26 °C) or fluctuating temperature (23 – 29 °C, within 24h) treatments. Following seven days of treatment, we measured physiological parameters to understand the effect of the different temperature environments on experimental corals. Coral tissue color, zooxanthellae density and Photosystem II photochemical efficiency did not change substantially in comparison to initial values. When comparing between sites and treatments, the concentration of chlorophyll-a changed significantly in the treatments depending on the original environment of coral collection. Specifically, the response of Houwan corals was higher in stable treatments in comparison to variable, and the opposite was true for Houbihu corals, which had higher chlorophyll-a in the variable treatments. Even though there were no significant differences of the main effects on coral growth rate, there was a significant interaction, similarly to the response of chlorophyll-a. Together, these results suggest the primary response of corals to temperature was a change in the concentration of chlorophyll-a when the thermal environment changed. The response of corals to the temperature treatments revealed higher chlorophyll-a and growth rate in the treatment most similar to their original environment, suggesting local environmental acclimatization or adaptation.
| Identifer | oai:union.ndltd.org:TW/098NDHU5270018 |
| Date | January 2010 |
| Creators | Pei-Hsun Chan, 詹珮熏 |
| Contributors | Tung-Yung Fan, 樊同雲 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 65 |
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