Organic matter release by cold water corals and its implication for fauna–microbe interaction
Organic matter release by cold water corals and its implication for fauna–microbe interaction
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冷水珊瑚释放的有机物及其对动物群-微生物相互作用的影响
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
H. Rapp
中科院分区：
文献类型：
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作者：
C. Wild;C. Mayr;L. Wehrmann;Sandra Schöttner;M. Naumann;F. Hoffmann;H. Rapp
收集、分析冷水珊瑚 Lophelia pertusa (L.) 和 Madrepora oculata (L.) 释放的颗粒物 (POM) 和溶解有机物 (DOM)，并与温水造礁珊瑚释放的颗粒物 (POM) 和溶解有机物 (DOM) 进行定量比较。 L. pertusa的颗粒氮（PN）和颗粒有机碳（POC）释放速率分别为0.14±0.07 mg N m -2 h -1和1.43±1.22 mg C m -2 h -1，处于温水珊瑚POM释放速率的较低范围内，而溶解有机碳（DOC）释放为47±19 mg C m -2 h -1 。由此产生的高 DOC:POC 比率表明大多数冷水珊瑚来源的有机物质立即溶解在水柱中。与温水珊瑚相似，冷水珊瑚会产生大量富含氮的珊瑚粘液，其中 Lophelia 珊瑚的 C:N 比例为 5 至 7，而 Madrepora 衍生的粘液的 C:N 比例为 7 至 9。含有天然微生物组合的冷水珊瑚粘液修正海水的耗氧率增加了 7 倍，表明这种有机物质为中上层微生物提供了有吸引力的食物来源。挪威罗斯特礁的现场调查表明，最靠近礁石的海水中的微生物活动比上覆水体高出 10 倍。这表明冷水珊瑚可以通过释放易于降解且营养丰富的有机物来刺激直接珊瑚礁附近的微生物活动，从而可以通过冷水珊瑚礁系统中的微生物循环作为碳和营养物循环的载体。
Particulate (POM) and dissolved organic matter (DOM) released by the cold water corals Lophelia pertusa (L.) and Madrepora oculata (L.) was collected, analysed and quantitatively compared to that released by warm water reef-building corals. Particulate nitrogen (PN) and partic- ulate organic carbon (POC) release rates of L. pertusa were 0.14 ± 0.07 mg N m -2 h -1 and 1.43 ± 1.22 mg C m -2 h -1 , respectively, which is in the lower range of POM release rates measured for warm water corals, while dissolved organic carbon (DOC) release was 47 ± 19 mg C m -2 h -1 . The resulting high DOC:POC ratio indicates that most cold water coral-derived organic matter immediately dis- solved in the water column. Cold water corals, similar to their warm water counterparts, produced large amounts of nitrogen-rich coral mucus with C:N ratios of 5 to 7 for Lophelia- and 7 to 9 for Madrepora-derived mucus. A 7-fold increase in the oxygen consumption rates in cold water coral mucus-amended seawater containing the natural microbial assemblage indicates that this organic matter provided an attractive food source for pelagic microbes. In situ investigations at Rost Reef, Norway, showed that microbial activity in the seawater closest to the reef was 10 times higher than in the overlying water column. This suggests that cold water corals can stimulate microbial activity in the direct reef vicinity by the release of easily degradable and nutrient-rich organic matter, which may thereby function as a vector for carbon and nutrient cycling via the microbial loop in cold water coral reef systems.