Transport and consumption of oxygen and methane in different habitats of the Hakon Mosby Mud Volcano (HMMV)
Transport and consumption of oxygen and methane in different habitats of the Hakon Mosby Mud Volcano (HMMV)
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DOI：
10.4319/lo.2010.55.6.2366
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发表时间：
2010-11-01
影响因子：
4.5
通讯作者：
Boetius, A.
中科院分区：
文献类型：
--
作者：
Felden, J.;Wenzhoefer, F.;Boetius, A.
Hakon Mosby泥火山是一个高度活跃的甲烷渗漏，拥有不同的化学合成群落，如硫化营养细菌垫和管虫组合。这项研究的重点是现场测量进出这些不同栖息地的甲烷通量，并与海底甲烷和氧气消耗率进行比较。通过量化不同生境的原位氧、甲烷和硫化物通量，建立了直径为10-1000米的面积的空间平衡。从中央到外缘的溶解甲烷流出量(770-2mmolm(-2)d(-1))的范围与温度梯度从46℃m(-1)减小到1℃cm-1有关，表明流体流动的空间变化控制着底栖生境和活动的分布。相应地，不同生境之间的总耗氧量(TOU)变化了一个数量级，从15mmolm(-2)d(-1)到161mmolm(-2)d(-1)。高的流体流速似乎通过限制电子受体的可用性来抑制底栖生物的活动。因此，最高的TOU与最低的流体流量和甲烷流出量相关。这很可能是由于甲烷的有氧氧化，这可能与以前在海底生态系统中被认为是甲烷的汇更相关。
The Hakon Mosby Mud Volcano is a highly active methane seep hosting different chemosynthetic communities such as thiotrophic bacterial mats and siboglinid tubeworm assemblages. This study focuses on in situ measurements of methane fluxes to and from these different habitats, in comparison to benthic methane and oxygen consumption rates. By quantifying in situ oxygen, methane, and sulfide fluxes in different habitats, a spatial budget covering areas of 10-1000-m diameter was established. The range of dissolved methane efflux (770-2 mmol m(-2) d(-1)) from the center to the outer rim was associated with a decrease in temperature gradients from 46 degrees C m(-1) to < 1 degrees Cm-1, indicating that spatial variations in fluid flow control the distribution of benthic habitats and activities. Accordingly, total oxygen uptake (TOU) varied between the different habitats by one order of magnitude from 15 mmol m(-2) d(-1) to 161 mmol m(-2) d(-1). High fluid flow rates appeared to suppress benthic activities by limiting the availability of electron acceptors. Accordingly, the highest TOU was associated with the lowest fluid flow and methane efflux. This was most likely due to the aerobic oxidation of methane, which may be more relevant as a sink for methane as previously considered in submarine ecosystems.