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首页> 外文期刊>Applied and Environmental Microbiology >Community Shift from Phototrophic to Chemotrophic Sulfide Oxidation following Anoxic Holomixis in a Stratified Seawater Lake
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Community Shift from Phototrophic to Chemotrophic Sulfide Oxidation following Anoxic Holomixis in a Stratified Seawater Lake

机译：分层海水湖中缺氧Holomixis后群落从光养性向化​​学养分的硫化物氧化转变。

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Most stratified sulfidic holomictic lakes become oxygenated after annual turnover. In contrast, Lake Rogoznica, on the eastern Adriatic coast, has been observed to undergo a period of water column anoxia after water layer mixing and establishment of holomictic conditions. Although Lake Rogoznica's chemistry and hydrography have been studied extensively, it is unclear how the microbial communities typically inhabiting the oxic epilimnion and a sulfidic hypolimnion respond to such a drastic shift in redox conditions. We investigated the impact of anoxic holomixis on microbial diversity and microbially mediated sulfur cycling in Lake Rogoznica with an array of culture-independent microbiological methods. Our data suggest a tight coupling between the lake's chemistry and occurring microorganisms. During stratification, anoxygenic phototrophic sulfur bacteria were dominant at the chemocline and in the hypolimnion. After an anoxic mixing event, the anoxygenic phototrophic sulfur bacteria entirely disappeared, and the homogeneous, anoxic water column was dominated by a bloom of gammaproteobacterial sulfur oxidizers related to the GSO/SUP05 clade. This study is the first report of a community shift from phototrophic to chemotrophic sulfide oxidizers as a response to anoxic holomictic conditions in a seasonally stratified seawater lake.
机译：在年营业额之后，大多数分层的硫磺化盐湖都被氧化。相比之下，在亚得里亚海东部海岸的Rogoznica湖被观察到在水层混合和形成完整条件之后经历了水柱缺氧期。尽管已经对Rogoznica湖的化学和水文学进行了广泛的研究，但目前尚不清楚通常居住在氧化性上扬子和硫的次生上的微生物群落如何应对这种在氧化还原条件下的急剧变化。我们使用一系列与文化无关的微生物学方法，研究了缺氧的全氟辛酸对罗各兹尼察湖微生物多样性和微生物介导的硫循环的影响。我们的数据表明该湖的化学物质与所产生的微生物之间存在紧密的联系。在分层过程中，产氧光养性硫细菌主要存在于趋化霉素和次碱中。发生缺氧混合事件后，产氧的光养性硫细菌完全消失，均质的缺氧水柱被大量与GSO / SUP05进化枝相关的γ-变形细菌硫氧化剂所支配。这项研究是关于季节性分层海水湖中对缺氧全盐环境响应的一种从光养型向化学养分的硫化物氧化剂转变的报告。

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