Recovery of coral populations after the 1998 bleaching on Shiraho Reef, in the southern Ryukyus, NW Pacific
Recovery of coral populations after the 1998 bleaching on Shiraho Reef, in the southern Ryukyus, NW Pacific
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DOI：
10.3354/meps239093
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发表时间：
2002-01-01
影响因子：
2.5
通讯作者：
Akimoto, F
中科院分区：
文献类型：
--
作者：
Kayanne, H;Harii, S;Akimoto, F
1997年和1998年，由于海面温度极高，发生了有记录以来最广泛和最严重的珊瑚白化现象。在琉球群岛，1998年7月下旬至10月上旬发生了大范围的白化。一个时间序列的断面研究礁滩揭示了不同物种的珊瑚种群对这一事件的不同反应。珊瑚覆盖监测之前，期间，和6次漂白发生后，沿着5个固定的样带，710至800米长，横跨白穗礁，石垣岛，在日本琉球群岛的礁坪。主要的珊瑚是蓝日孔珊瑚、大规模的滨珊瑚、分支的滨珊瑚、单孔珊瑚、鹿角珊瑚和孔雀珊瑚（后4个属不能总是在物种水平上区分，因此按属和生态型分组）。H.蓝花是最不容易漂白和保持几乎恒定的覆盖漂白前后。大量的滨珊瑚容易受到漂白的影响，但在漂白后恢复了藻类，并维持了它们的覆盖范围。另一方面，分支Porites，Montipora和Acropora容易漂白和死亡率高。覆盖由分支Montipora最初减少了66%，但2年后，漂白它已恢复到漂白前的覆盖范围。然而，只有大斑块超过70沿着样带，覆盖率为10至40%，恢复。小块小于30米沿着样带，覆盖率小于10%，死亡，并没有恢复，珊瑚漂白的反应不同，根据战略的珊瑚使用对漂白;中度频繁和严重的漂白可能允许共存的两种类型的珊瑚在同一个礁坪，在白穗礁的情况下。
The most extensive and severe bleaching of coral ever recorded occurred in 1997 and 1998 as a result of anomalously high sea-surface temperatures. In the Ryukyu Islands, extensive bleaching occurred from late July to early October in 1998. A time-series transect study on a reef flat revealed the different responses of coral populations among species to this event. Coral cover was monitored just before, during, and 6 times after the bleaching occurred, along 5 fixed transects, 710 to 800 m long, across the reef flat of Shiraho Reef, Ishigaki Island, in the Ryukyu Islands of Japan. The dominant corals were Heliopora coerulea, massive Porites, and branching Porites, Montipora, Acropora, and Pavona (these latter 4 genera could not always be distinguished to species level, and are thus grouped by genus and ecoform). H. coerulea was the least susceptible to bleaching and maintained almost constant coverage before and after the bleaching. Massive Porites were susceptible to bleaching, but regained their algae after the bleaching and sustained their coverage. On the other hand, the branching Porites, Montipora, and Acropora were susceptible to bleaching and mortality was high. Coverage by branching Montipora was initially reduced by 66 %, but by 2 yr after the bleaching it had recovered to pre-bleaching coverage. However, only large patches of more than 70 in along a transect, with coverage of 10 to 40 %, recovered. Small patches of less than 30 m along a transect, with coverage of less than 10 %, died and did not recover, The response of corals to bleaching differs according to the strategy the coral uses against bleaching; moderately frequent and severe bleaching might permit the coexistence of both types of corals on the same reef flat, as in the case of Shiraho Reef.