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Role of elevated organic carbon levels and microbial activity in coral mortality

机译：升高的有机碳水平和微生物活性在珊瑚死亡中的作用

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Coral reefs are suffering a long-term global decline, yet the causes remain contentious. The role of poor water quality in this decline is particularly unclear, with most previous studies providing only weak correlations between elevated nutrient levels and coral mortality. Here we experimentally show that routinely measured components of water quality (nitrate, phosphate, ammonia) do not cause substantial coral mortality. In contrast, dissolved organic carbon (DOC), which is rarely measured on reefs, does. Elevated DOC levels also accelerate the growth rate of microbes living in the corals' surface mucopolysaccharide layer by an order of magnitude, suggesting that mortality occurs due to a disruption of the balance between the coral and its associated microbiota. We propose a model by which elevated DOC levels cause Caribbean reefs to shift further from coral to macroal-gal dominance. Increasing DOC levels on coral reefs should be recognized as a threat and routinely monitored.
机译：珊瑚礁正在遭受全球范围的长期衰退，但原因仍然存在争议。水质差在这种下降中的作用尚不清楚，以前的大多数研究仅在营养水平升高与珊瑚死亡率之间仅存在弱关联。在这里，我们通过实验表明，常规测量的水质成分（硝酸盐，磷酸盐，氨水）不会导致珊瑚的大量死亡。相反，溶解有机碳（DOC）很少在礁石上测量。 DOC水平升高也使生活在珊瑚表面粘多糖层中的微生物的生长速度提高了一个数量级，这表明死亡率的出现是由于破坏了珊瑚及其相关微生物群之间的平衡。我们提出了一个模型，通过该模型可以提高DOC的水平，从而使加勒比海的礁石从珊瑚向大型藻类转变。珊瑚礁中DOC含量的增加应被视为一种威胁，并应进行常规监测。

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