Widespread variation in heat tolerance and symbiont load are associated with growth tradeoffs in the coral Acropora hyacinthus in Palau.
Widespread variation in heat tolerance and symbiont load are associated with growth tradeoffs in the coral Acropora hyacinthus in Palau.
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DOI：
10.7554/elife.64790
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发表时间：
2021-08-13
期刊：
影响因子：
7.7
通讯作者：
Palumbi SR
中科院分区：
文献类型：
--
作者：
Cornwell B;Armstrong K;Walker NS;Lippert M;Nestor V;Golbuu Y;Palumbi SR
气候变化正在极大地改变生态系统的组成和生产力，这促使科学家们考虑绘制自然抵抗力和培养面对这些变化的生态系统恢复力的最佳方法。在这里，我们展示了珊瑚抗白化性的大规模实验评估结果，这是珊瑚种群在海洋变暖时持续存在的关键特征，在帕劳37个珊瑚礁的221个珊瑚群落中。我们发现抗白化个体栖息在大多数珊瑚礁中，但更常在温暖的微栖息地中发现。我们的调查还发现，菌落之间的共生体浓度差异很大，共生体负荷较低的菌落往往更耐漂白。相比之下，我们的数据显示，较低的共生负荷是以较低的生长速度为代价的，这种权衡可能在不同环境的珊瑚中广泛存在。具有高抗白化能力的珊瑚已被建议作为生境恢复或选择性繁殖的来源，以增加珊瑚礁对气候变化的适应能力。我们的地图显示了可以找到这些耐高温珊瑚的地方，但存在与耐热性的权衡，可能表明在恢复中单方面使用这一特性时要谨慎。
Climate change is dramatically changing ecosystem composition and productivity, leading scientists to consider the best approaches to map natural resistance and foster ecosystem resilience in the face of these changes. Here, we present results from a large-scale experimental assessment of coral bleaching resistance, a critical trait for coral population persistence as oceans warm, in 221 colonies of the coral Acropora hyacinthus across 37 reefs in Palau. We find that bleaching-resistant individuals inhabit most reefs but are found more often in warmer microhabitats. Our survey also found wide variation in symbiont concentration among colonies, and that colonies with lower symbiont load tended to be more bleaching-resistant. By contrast, our data show that low symbiont load comes at the cost of lower growth rate, a tradeoff that may operate widely among corals across environments. Corals with high bleaching resistance have been suggested as a source for habitat restoration or selective breeding in order to increase coral reef resilience to climate change. Our maps show where these resistant corals can be found, but the existence of tradeoffs with heat resistance may suggest caution in unilateral use of this one trait in restoration.