Bacterial degradability of dissolved organic carbon in coral mucus
Bacterial degradability of dissolved organic carbon in coral mucus
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发表时间：
2008
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通讯作者：
Y. Tanaka;T. Miyajima;H. Ogawa
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作者：
Y. Tanaka;T. Miyajima;H. Ogawa
在黑暗条件下对珊瑚粘液中溶解有机碳 (DOC) 的细菌分解进行了 7 个月的研究，以揭示珊瑚来源的 DOC 被细菌快速利用的百分比，以及相反，作为难分解有机物长期保留的百分比。在第一周，从天然珊瑚礁水中收集的细菌将造血型珊瑚 Acropora pulchra 和 Porites cylindrica 释放的 38%-47% DOC 矿化。在1周内，细菌丰度从10 3 个细胞ml -1 急剧增加到10 6 个细胞ml -1 。 1周时部分剩余的有机碳在3个月内缓慢分解，但此后没有观察到进一步的降解。最后，32%-44% 的初始 DOC 在 7 个月内没有矿化。这些结果表明，在黑暗条件下，珊瑚粘液中的 DOC 不会被自由生活的细菌完全降解，并且有助于作为难降解有机物的长期 C 固定。
Bacterial decomposition of dissolved organic carbon (DOC) in coral mucus was investigated under dark conditions for 7 months to reveal what percentage of the coral-derived DOC is rapidly utilized by bacteria, and conversely, what percentage remained for a long term as refractory organic matter. During the first week, 38%-47% of DOC released from the hermatypic corals Acropora pulchra and Porites cylindrica were mineralized by bacteria collected from natural reef water. The bacterial abundance dramatically increased from the order of 10 3 to 10 6 cells ml -1 during the 1 week. Some part of the remaining organic C at 1 week was slowly decomposed over 3 months, but further degradation was not observed thereafter. Finally, 32%-44% of the initial DOC was not mineralized over 7 months. These results suggest that, under dark conditions, DOC in coral mucus is not completely degraded by free-living bacteria and contributes to long-term C fixation as refractory organic matter.