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首页> 外文期刊>Marine biology >Major bleaching events can lead to increased thermal tolerance in corals
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Major bleaching events can lead to increased thermal tolerance in corals

机译:重大的漂白事件可能导致珊瑚的耐热性提高

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摘要

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.
机译:气候变化是全球珊瑚礁生态系统的主要威胁。气候变暖中珊瑚礁命运的关键决定因素是其承受不断增加的热应力的能力。在此,在1998年大堡礁(澳大利亚)发生大规模的大规模漂白事件之后,三个主要珊瑚属(Acropora,Pocillopora和Porites)的热耐受性得到了提高。在随后的更严重的热应力事件中2002年,尽管2002年热事件期间太阳辐射较高,但漂白严重程度比1998年严重程度和热应力之间的关系预测的结果要低30-100%。最容易受到热应力作用的珊瑚属(Pocillopora和Acropora)显示出最大的耐受性增加。尽管在1998年漂白很严重,但在大多数研究地点,全殖民地死亡率很低。因此,观察到的热耐受性增加不能仅通过选择性死亡率来解释,这表明其具有适应或适应的能力。尽管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,但是这种耐热性的提高可能会延迟珊瑚礁大规模死亡的时间,以实现低排放情景和有效管理。

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