Heterotrophic plasticity and resilience in bleached corals
Heterotrophic plasticity and resilience in bleached corals
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DOI：
10.1038/nature04565
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发表时间：
2006-04-27
期刊：
影响因子：
64.8
通讯作者：
Palardy, JE
中科院分区：
文献类型：
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作者：
Grottoli, AG;Rodrigues, LJ;Palardy, JE
过去几十年里，海水温度升高导致的大规模珊瑚白化事件（1,2）造成了整个热带地区大量珊瑚死亡（3,4）。随着全球持续变暖，预计白化事件的频率和严重程度将会增加，在接下来的几十年内全球珊瑚死亡率可能高达60%（4 - 6）。尽管一些珊瑚能够恢复并在白化过程中存活下来（7,8），但人们对这种恢复能力背后的机制知之甚少。在此我们表明珊瑚宿主在恢复和恢复力方面起着重要作用。白化及正在恢复的分支状的蔷薇珊瑚（Montipora capitata）通过显著提高摄食率和异养获取的碳对动物日常呼吸的贡献率（CHAR），满足了其每日代谢能量需求的100%以上，而滨珊瑚属的扁缩滨珊瑚（Porites compressa，分支状）和叶状滨珊瑚（Porites lobata，丘状）则没有。这些发现表明，在白化和恢复期间具有高CHAR能力的珊瑚物种，无论其形态如何，从长远来看将更能抵御白化事件，可能会成为珊瑚礁上的优势物种，并可能有助于保护受影响的珊瑚礁避免局部和全球范围内的灭绝。
Mass coral bleaching events caused by elevated seawater temperatures(1,2) have resulted in extensive coral mortality throughout the tropics over the past few decades(3,4). With continued global warming, bleaching events are predicted to increase in frequency and severity, causing up to 60% coral mortality globally within the next few decades(4-6). Although some corals are able to recover and to survive bleaching(7,8), the mechanisms underlying such resilience are poorly understood. Here we show that the coral host has a significant role in recovery and resilience. Bleached and recovering Montipora capitata (branching) corals met more than 100% of their daily metabolic energy requirements by markedly increasing their feeding rates and CHAR (per cent contribution of heterotrophically acquired carbon to daily animal respiration), whereas Porites compressa (branching) and Porites lobata (mounding) corals did not. These findings suggest that coral species with high-CHAR capability during bleaching and recovery, irrespective of morphology, will be more resilient to bleaching events over the long term, could become the dominant coral species on reefs, and may help to safeguard affected reefs from potential local and global extinction.