Major bleaching events can lead to increased thermal tolerance in corals
Major bleaching events can lead to increased thermal tolerance in corals
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DOI：
10.1007/s00227-008-1015-y
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发表时间：
2008-08-01
期刊：
影响因子：
2.4
通讯作者：
Masiri, I.
中科院分区：
文献类型：
--
作者：
Maynard, J. A.;Anthony, K. R. N.;Masiri, I.
气候变化是全球珊瑚礁生态系统的主要威胁。在气候变暖的情况下，决定珊瑚礁命运的一个关键因素是它们承受不断增加的热应力的能力。在这里，增加耐热性证明了三个主要的珊瑚属（鹿角珊瑚，Pocillopora和滨珊瑚）后，发生在大堡礁（澳大利亚）在1998年广泛的大规模漂白事件。在随后的和更严重的热应力事件在2002年，漂白的严重程度是30-100%，低于1998年的严重程度和热应力之间的关系预测，尽管在2002年的热事件较高的太阳辐照度。珊瑚属最容易受到热应力（Pocillopora和Acropora）表现出最大的耐受性增加。虽然漂白是严重的，在1998年，整个殖民地死亡率低，在大多数研究地点。因此，观察到的耐热性增加不能单独用选择性死亡率来解释，这表明了适应或适应的能力。虽然珊瑚礁的脆弱性在很大程度上仍然取决于气候变化的速度和程度，但这种耐热性的提高可能会推迟珊瑚大规模死亡的发生，以便及时实施低排放情景和有效管理。
Climate change is a major threat to coral reef ecosystems worldwide. A key determinant of the fate of reef corals in a warming climate is their capacity to tolerate increasing thermal stress. Here, an increase in thermal tolerance is demonstrated for three major coral genera (Acropora, Pocillopora and Porites) following the extensive mass bleaching event that occurred on the Great Barrier Reef (Australia) in 1998. During the subsequent and more severe thermal stress event in 2002, bleaching severity was 30-100% lower than predicted from the relationship between severity and thermal stress in 1998, despite higher solar irradiances during the 2002 thermal event. Coral genera most susceptible to thermal stress (Pocillopora and Acropora) showed the greatest increase in tolerance. Although bleaching was severe in 1998, whole-colony mortality was low at most study sites. Therefore, observed increases in thermal tolerance cannot be explained by selective mortality alone, suggesting a capacity for acclimatization or adaptation. Although the vulnerability of coral reefs remains largely dependent on the rate and extent of climate change, such increase in thermal tolerance may delay the onset of mass coral mortalities in time for the implementation of low-emission scenarios and effective management.