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首页> 外文期刊>Limnology >Spatiotemporal distribution of bacteriochlorophylls in the meromictic Lake Suigetsu, Japan
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Spatiotemporal distribution of bacteriochlorophylls in the meromictic Lake Suigetsu, Japan

机译：日本淡水湖中的细菌叶绿素的时空分布

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摘要

The spatiotemporal distribution of chlorophyll pigments (chloropigments) in the water column of a meromictic lake, Lake Suigetsu (Fukui, Japan), was investigated. Water samples were collected from the central basin of Lake Suigetsu bimonthly between May 2008 and March 2010 at appropriate depths, including the oxic surface, oxic–anoxic interface, and anoxic bottom layers. Chlorophyll a, related to cyanobacteria and eukaryotic phytoplankton, was detected throughout the water column during the years of the study, whereas bacteriochlorophyll e, related to brown-colored green sulfur bacteria, was detected in the anoxic layers below the chemocline at a maximum concentration of 825 μg L~(-1). The concentration of bacteriochlorophyll e was generally maximal at or just below the chemocline of the lake. The cellular content of bacteriochlorophyll e was estimated to be low in the upper part of the chemocline and tended to increase with increasing water depth. Bacteriochlorophyll a, which was presumably related to purple sulfur bacteria, was only detected at the chemocline during summer and autumn at concentrations of 5.4–16.3 μg L~(-1). Our analysis of the chloropigment distribution for the two years of the study suggested that brown-colored green sulfur bacteria are the predominant phototroph in the anoxic layers of Lake Suigetsu, and that these play a significant role in the carbon and sulfur cycling of the lake, especially from spring to summer.
机译：研究了淡水湖Suigetsu（日本福井）的水柱中叶绿素色素（叶绿素）的时空分布。在2008年5月至2010年3月期间，每两个月从水ig湖中央盆地收集水样，包括有氧表面，有氧-缺氧界面和缺氧底层。在研究期间，在整个水柱中都检测到与蓝藻和真核浮游植物有关的叶绿素a，而在最大比浓度低于趋化因子的缺氧层中检测到与棕绿色硫细菌有关的叶绿素e。 825μgL〜（-1）。细菌的叶绿素e的浓度通常在湖泊的趋化线处或恰好在其以下。据估计，在趋化霉素的上部，细菌叶绿素e的细胞含量较低，并且随着水深的增加而趋于增加。细菌叶绿素a可能与紫色硫细菌有关，仅在夏季和秋季的chemocline中检测到浓度为5.4–16.3μgL〜（-1）。我们对两年研究中的绿色色素分布的分析表明，褐色的绿色硫细菌是Suigetsu湖缺氧层的主要光养菌，它们在湖泊的碳和硫循环中起着重要作用，特别是从春季到夏季。

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