Methane production in aerobic oligotrophic surface water in the central Arctic Ocean
Methane production in aerobic oligotrophic surface water in the central Arctic Ocean
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DOI：
10.5194/bg-7-1099-2010
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发表时间：
2010-01-01
期刊：
影响因子：
4.9
通讯作者：
Kiene, R. P.
中科院分区：
文献类型：
--
作者：
Damm, E.;Helmke, E.;Kiene, R. P.
相对于大气平衡的甲烷过剩是海洋表面水经常观察到的特征。尽管生物过程是其起源的共同事实，但对好氧地表水中甲烷的形成仍然知之甚少。我们报告的甲烷生产在北冰洋中部，这是专门检测到在太平洋衍生的水，但没有附近的大西洋衍生的水。这两种水团的区别在于它们的硝酸盐与磷酸盐的比例不同。我们表明，甲烷的产生发生，如果硝酸盐耗尽，但磷酸盐可作为磷源。显然，低N：P比增强了细菌竞争磷酸盐的能力，而浮游植物代谢产物二甲基磺基丙酸盐（DMSP）被用作C源。这一点得到了验证实验诱导甲烷生产DMSP加标北极海水。因此，我们建议甲基化的化合物可能作为甲烷的前体和热力学计算表明，甲基营养型甲烷可以提供能量在有氧环境中。
A methane surplus relative to the atmospheric equilibrium is a frequently observed feature of ocean surface water. Despite the common fact that biological processes are responsible for its origin, the formation of methane in aerobic surface water is still poorly understood. We report on methane production in the central Arctic Ocean, which was exclusively detected in Pacific derived water but not nearby in Atlantic derived water. The two water masses are distinguished by their different nitrate to phosphate ratios. We show that methane production occurs if nitrate is depleted but phosphate is available as a P source. Apparently the low N:P ratio enhances the ability of bacteria to compete for phosphate while the phytoplankton metabolite dimethylsulfoniopropionate (DMSP) is utilized as a C source. This was verified by experimentally induced methane production in DMSP spiked Arctic sea water. Accordingly we propose that methylated compounds may serve as precursors for methane and thermodynamic calculations show that methylotrophic methanogenesis can provide energy in aerobic environments.