Bleaching, energetics, and coral mortality risk: Effects of temperature, light, and sediment regime
Bleaching, energetics, and coral mortality risk: Effects of temperature, light, and sediment regime
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DOI：
10.4319/lo.2007.52.2.0716
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发表时间：
2007-03-01
影响因子：
4.5
通讯作者：
Hoegh-Guldberg, Ove
中科院分区：
文献类型：
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作者：
Anthony, Kenneth R. N.;Connolly, Sean R.;Hoegh-Guldberg, Ove
珊瑚白化最严重的后果是群落死亡。然而，在气候变化情景下，死亡风险是对珊瑚礁珊瑚最不了解的后果之一。具体来说，温度异常、太阳辐照度变化、水质下降和死亡风险之间的联系尚不清楚。在这里，我们分析了高温、光照和沉积物负荷对珊瑚生存的影响，在一个受控的水箱实验中，我们使用了来自大堡礁内泻湖的中间Acropora。基于1600个亚群落命运的生存分析显示，温度和沉积物对珊瑚死亡风险有很强的影响。正如预期的那样，高温增加了所有光照和沉积物水平下的死亡风险。然而，高沉积物减少了高温和/或强光下的死亡率，可能是通过减轻光照压力和为白化的珊瑚提供另一种食物来源。使用珊瑚能量状态（脂质储存）作为预测变量的生存模型提供了极好的数据拟合，表明在不同处理之间和随时间的生存变化可以用群落能量学来解释。我们的研究为预测涉及多个环境变量的复杂白化情景下珊瑚死亡风险提供了一个新的框架。
The most severe outcome of coral bleaching is colony mortality. However, the risk of mortality is one of the least understood consequences for reef corals under climate-change scenarios. Specifically, links among combinations of temperature anomalies, varying solar irradiance, reduced water quality, and mortality risks are unclear. Here, we analyze the effects of high temperature, irradiance, and sediment loading on coral survivorship in a controlled tank experiment using Acropora intermedia from the inner Great Barrier Reef lagoon. Survival analyses based on the fate of 1600 subcolonies revealed that temperature and sediment exerted strong effects on coral mortality risk. As expected, high temperature increased mortality risk at all light and sediment levels. However, high sediment reduced mortality under high temperature and/or high light, potentially by alleviating light pressure and by providing an alternative food source for bleached corals. A survivorship model using coral energy status (lipid stores) as a predictor variable provided an excellent fit to the data, suggesting that much of the variation in survivorship among treatments and over time can be explained by colony energetics. Our study provides a new framework for predicting coral mortality risk under complex bleaching scenarios in which multiple environmental variables are involved.