Bleaching and hurricane disturbances to populations of coral recruits in Belize
Bleaching and hurricane disturbances to populations of coral recruits in Belize
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白化和飓风对伯利兹新珊瑚种群的干扰
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发表时间：
1999
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影响因子：
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通讯作者：
P. Mumby
中科院分区：
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作者：
P. Mumby
1998年，伯利兹的珊瑚种群同时受到严重珊瑚白化事件和米奇飓风的干扰。这些干扰对自然形成的珊瑚新生物(直径2至20毫米)的影响进行了评估，这些珊瑚新生物位于8至10米深的格洛弗环礁前礁。所有4个研究地点都发生了漂白，但飓风只影响了2个地点，因此可以将漂白的影响与漂白加飓风破坏的影响进行比较。干扰前的招募密度、大小-频率分布和群落结构在站点之间相似(以公里为尺度)。漂白过程持续了约3.5个月。70%至90%的成年蜂群完全漂白，至少25%的新兵表现出漂白迹象。在成年蜂群恢复正常颜色一个月后，只有1%的新兵表现出部分漂白。令人惊讶的是，珊瑚漂白本身对新兵密度或群落结构都没有可测量的影响。漂白和飓风干扰相结合，使新兵总密度降至干扰前水平的20%。漂白/飓风干扰对群落结构的影响在空间上是零散的，我认为这种斑块可能是由于保护性微生境的不同盖度和/或靠近礁石切割(礁顶断裂)而产生的不同风暴条件所致。
In 1998, coral populations in Belize were disturbed simultaneously by a severe coral bleaching event and Hurricane Mitch. The impact of these disturbances was assessed for naturally occurring populations of coral recruits (2 to 20 mm diameter), at a depth of 8 to 10 m on the forereef of Glovers Atoll. Bleaching took place at all 4 study sites but the hurricane only affected 2 sites, enabling the effects of bleaching to be compared to those arising from bleaching plus hurricane damage. Pre-disturbance recruit density, size-frequency distribution, and community structure were similar between sites (at kilometre scales). The bleaching event lasted ca 3.5 mo. From 70 to 90% of adult colonies bleached fully and at least 25% of recruits exhibited signs of bleaching. A month after adult colonies had regained usual colouration, only 1% of recruits showed even partial bleaching. Surprisingly, coral bleaching alone had no measurable effect on either recruit density or community structure. The combination of bleaching and hurricane disturbance reduced total recruit densities to 20% of pre-disturbance levels. Effects of bleaching/hurricane disturbance on community structure were spatially patchy, and I suggest that such patchiness may arise from variable cover of protective microhabitat and/or different storm conditions mediated by proximity to reef cuts (breaks in the reef crest).