Bacterial decomposition of coral mucus as evaluated by long-term and quantitative observation
Bacterial decomposition of coral mucus as evaluated by long-term and quantitative observation
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DOI：
10.1007/s00338-011-0729-3
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发表时间：
2011-02
期刊：
影响因子：
3.5
通讯作者：
Yasuaki Tanaka;H. Ogawa;T. Miyajima
中科院分区：
文献类型：
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作者：
Yasuaki Tanaka;H. Ogawa;T. Miyajima
以台湾鹿角珊瑚和指状单孔珊瑚的粘液为材料，在黑暗条件下与细菌培养1年，以定量降解率为指标。所有的粘液样品都显示出类似的分解模式：粘液中约80%的总有机碳（TOC）在1个月内矿化，而一些粘液在1年内缓慢分解。采用指数曲线进行回归分析，考虑三个降解池（不稳定，半不稳定，难降解）拟合TOC浓度的变化非常好（r2> 0.99）。根据这两种珊瑚的数据，珊瑚粘液中不稳定的有机碳的矿化率为10- 18%d − 1，占粘液中初始TOC的79-87%。半不稳定有机碳的矿化率为0.3 - 1.6%d-1，占初始TOC的11 - 18%。难降解有机碳最多占6%。这些结果表明，并非所有的珊瑚粘液都能被细菌迅速分解，但有些粘液仍作为半不稳定和难降解的有机物质存在数月。
Coral mucus released fromAcropora formosaandMontipora digitatawas incubated with bacteria under dark conditions for 1 year to evaluate the quantitative degradability. All the mucus samples showed a similar decomposition pattern: about 80% of total organic carbon (TOC) in the mucus was mineralized within 1 month, while some mucus was slowly decomposed over the 1 year. Regression analysis using an exponential curve considering three degradability pools (labile, semilabile, and refractory) fitted the changes of the TOC concentrations very well (r2> 0.99). Compiling the data on the two coral species, the labile organic C in the coral mucus had mineralization rates of 10–18% d−1and accounted for 79–87% of the initial TOC in the mucus. Semilabile organic C had mineralization rates of 0.3−1.6% d−1and accounted for 11−18% of the initial TOC. Refractory organic C accounted for 6% at most. These results suggest that not all coral mucus is rapidly decomposed by bacteria but some mucus remains as semilabile and refractory organic matter for several months.