Mats of colourless sulphur bacteria .1. Major microbial processes
Mats of colourless sulphur bacteria .1. Major microbial processes
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DOI：
10.3354/meps128161
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发表时间：
1995-11-01
影响因子：
2.5
通讯作者：
Bernard, C
中科院分区：
文献类型：
--
作者：
Fenchel, T;Bernard, C
本文研究了2种海洋沉积物中无色硫细菌的硫化物和氧通量、关键微生物过程速率以及时空异质性。在一个相对受保护的栖息地为主的Beggiatoa物种，约70%的沉积物O-2-消费可以占由S2-到SO 42-的氧化，约15%的食物链燃料的化能自养生产，而其余的是由于有氧过程不直接与硫循环。在此沉积物中，约85%的异地和本地（光养和化养生产）的有机碳矿化厌氧。另一个栖息地是一个浅海湾，这是经常受到波浪引起的运输和侵蚀的沉积物。从秋季到春季，沉积物表面的无色硫细菌群落在时间和空间上是不规则的，它们代表了不同的演替阶段，相对于生物群的组成和处理速率。在这里，化能自养硫化物氧化的相对重要性是高度可变的。在夏季，该沉积物的表面微生物群落占主导地位的光合细菌和无色的硫细菌构成了一个不太重要的组成部分。
Mats of colourless sulphur bacteria from 2 marine sediments were studied with respect to sulphide and oxygen fluxes, rates of key microbial processes and spatial and temporal heterogeneity. In a relatively protected habitat dominated by Beggiatoa species, about 70% of the sediment O-2-consumption could be accounted for by the oxidation of S2- to SO42-, about 15% by food chains fuelled by chemoautotrophic production, while the remainder was due to aerobic processes not directly associated with the sulphur cycle. In this sediment about 85% of the allochthonous and autochthonous (phototrophic and chemotrophic production) organic carbon was mineralised anaerobically. The other habitat was a shallow bay which is often subject to wave-induced transport and erosion of the sediment. From autumn to spring, sediment surface communities of colourless sulphur bacteria were patchy in time and space and they represented different successional stages with respect to the composition of the biota and to process rates. Here the relative significance of chemoautotrophic sulphide oxidation was highly variable. During summer the surface microbial communities of this sediment were dominated by phototrophs and the colourless sulphur bacteria constituted a less important component.