Coral recovery at Aldabra Atoll, Seychelles: five years after the 1998 bleaching event
Coral recovery at Aldabra Atoll, Seychelles: five years after the 1998 bleaching event
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塞舌尔阿尔达布拉环礁的珊瑚恢复：1998 年白化事件五年后
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
M. Callow
中科院分区：
文献类型：
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作者：
B. Stobart;K. Teleki;R. Buckley;N. Downing;M. Callow
在1998年发生大规模珊瑚漂白事件后，对阿尔达布拉环礁礁底栖生物的变化进行了评估。利用录像断面调查底栖生物，并使用澳大利亚海洋科学研究所的五点法进行分析。将剑桥南塞舌尔环礁研究方案收集的珊瑚覆盖数据与本研究期间收集的数据进行比较后发现，白化事件后，阿尔达布拉珊瑚的死亡率在10米深处约为66%，在20米深处约为38%。五年后，一些地点的硬珊瑚有恢复的迹象，但尽管几年来珊瑚大量增加（10米深处每平方米增加7-9个新珊瑚，20米深处每平方米增加4-6个新珊瑚，其中新珊瑚的定义是最大直径在5厘米以下的任何群体），硬珊瑚的恢复并没有达到显著的水平。一些地点的软珊瑚覆盖面积有相当大的增加，其中以Rhytisma属为主。在漂白事件之后，大型藻类覆盖没有增加，尽管如预期的那样，死珊瑚被珊瑚藻占据。自1998年以来，没有再发生导致阿尔达布拉珊瑚大规模死亡的事件。
Changes in reef benthos were assessed at Aldabra Atoll following the mass coral bleaching event of 1998. Video transects were used to survey the benthos and analysed using the Australian Institute of Marine Science five–dot method. Comparison of coral cover data collected by the Cambridge Southern Seychelles Atoll Research Programme with data collected during this study revealed that mortality of coral at Aldabra following the bleaching event was approximately 66% at 10 m depth and 38% at 20 m depth. Five years on, there are signs of hard coral recovery at some locations, but in spite of several years of high coral recruitment (7–9 recruits per m2 at 10 m depth, 4–6 recruits per m2 at 20 m depth, where recruits are defined as any colony under 5 cm maximum diameter), recovery of hard coral has not occurred at a significant level. There has been a considerable increase in soft coral cover at some locations, which was dominated by the genus Rhytisma. Macro algal cover did not increase following the bleaching event, although, as would be expected, dead corals have been colonized by coralline algae. There have been no further events leading to large–scale coral mortality at Aldabra since 1998.