Effect of temperature on two reef-building corals Pocillopora damicornis and P. verrucosa in the Red Sea
Effect of temperature on two reef-building corals Pocillopora damicornis and P. verrucosa in the Red Sea
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DOI：
10.5697/oc.55-4.917
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发表时间：
2013-01-01
期刊：
影响因子：
2.9
通讯作者：
Floos, Yahya A. M.
中科院分区：
文献类型：
--
作者：
Al-Sofyani, Abdulmohsin A.;Floos, Yahya A. M.
2009年12月至2010年11月，研究了温度对栖息在沙特阿拉伯西部红海海岸小海湾Obhur Creek的两种造礁珊瑚Pocillopora damicornis和P. verrucosa的影响。Obhur Creek海水温度的总体年变化范围在24.5摄氏度到33摄氏度之间。虫黄藻的丰度和多样性具有季节性变化，红角滨对虾虫黄藻的数量略高于疣角滨对虾，两种虫黄藻的丰度均为夏季低、冬季高。冬夏两季的呼吸强度变化不大，说明疣突海鞘在进行补偿性驯化。相反，红腹滨对虾的呼吸速率冬季低于夏季。在冬季，由于最佳海水温度（30摄氏度），这两个物种的代谢率较高。由于虫黄藻的丰富和最适海水温度，两种珊瑚的骨骼生长速度在冬季较高，夏季较低。总体而言，结果表明，疣状原甲藻对温度的适应性比黄角原甲藻更强。虫黄藻在35摄氏度下的耐热性差异可能是由于两个物种之间的藻类基因型，导致当代谢速率超过光合作用速率时，随着温度的升高，P. damicornis变得漂白。
The effects of temperature on two reef building corals Pocillopora damicornis and P. verrucosa inhabiting the Obhur Creek, a small embayment on the western, Red Sea coast of Saudi Arabia, was studied from December 2009 to November 2010. The overall annual range of seawater temperature in Obhur Creek was between 24.5 degrees C and 33 degrees C . Zooxanthellae abundance and diversity showed seasonal variations: the number of zooxanthellae in P. damicornis was slightly higher than in P. verrucosa, and the abundance of zooxanthellae of both species was low in summer and high during winter. The respiration rate of P. verrucosa did not vary between summer and winter, suggesting compensatory acclimation. In contrast, the respiratory rate in P. damicornis was lower in winter than in summer. During the winter season the metabolic rate was higher in both species owing to the optimum seawater temperature (30 degrees C). As a result of the abundance of zooxanthellae and the optimum seawater temperature, the growth rates of the skeletons of the two coral species were higher in winter and lower in summer. In general, the results showed that P. verrucosa is more flexible with respect to temperature than P. damicornis. The difference in zooxanthellae thermal tolerances at 35 degrees C may be due to the algal genotypes between the two species, resulting in P. damicornis becoming bleached as the rate of metabolism exceeds the rate of photosynthesis with increasing temperature.