Spatiotemporal distribution of bacteriochlorophylls in the meromictic Lake Suigetsu, Japan
Spatiotemporal distribution of bacteriochlorophylls in the meromictic Lake Suigetsu, Japan
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DOI：
10.1007/s10201-013-0415-y
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发表时间：
2013-08
期刊：
影响因子：
1.6
通讯作者：
R. Kondo;Misa Kodera;Yumi Mori;Takahiko Okamura;S. Yoshikawa;K. Ohki
中科院分区：
文献类型：
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作者：
R. Kondo;Misa Kodera;Yumi Mori;Takahiko Okamura;S. Yoshikawa;K. Ohki
研究了日本福井绥格苏湖亚混交湖水体中叶绿素色素的时空分布。水样采集于2008年5月至2010年3月，每两个月采集一次水样，水样深度适中，包括好氧表层、好氧-缺氧界面层和缺氧层。与蓝藻和真核浮游植物有关的绿藻在研究期间在整个水柱中都被检测到，而与棕色绿色硫磺细菌有关的细菌叶绿素在趋化层以下的缺氧层中被检测到，最大浓度为825gμg和L−1。细菌叶绿素的浓度一般在湖的化跃层或略低于化跃层。细菌-叶绿素的细胞含量估计在趋化层的上部较低，并随着水深的增加而增加。细菌绿藻可能与紫色硫磺细菌有关，只有在夏季和秋季的趋化层中才能检测到浓度为5.4-16.3gμg和L−1的细菌。我们对研究的两年的氯色素分布的分析表明，棕色绿色硫磺细菌是绥格斯湖缺氧层中的优势光生细菌，这些细菌在湖的碳硫循环中起着重要作用，特别是从春季到夏季。
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. Chlorophylla, related to cyanobacteria and eukaryotic phytoplankton, was detected throughout the water column during the years of the study, whereas bacteriochlorophylle, 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 bacteriochlorophyllewas generally maximal at or just below the chemocline of the lake. The cellular content of bacteriochlorophyllewas estimated to be low in the upper part of the chemocline and tended to increase with increasing water depth. Bacteriochlorophylla, 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.