Biomarkers in the stratified water column of the Landsort Deep (Baltic Sea)
Biomarkers in the stratified water column of the Landsort Deep (Baltic Sea)
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DOI：
10.5194/bg-11-7009-2014
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发表时间：
2014-01-01
期刊：
影响因子：
4.9
通讯作者：
Blumenberg, M.
中科院分区：
文献类型：
--
作者：
Berndmeyer, C.;Thiel, V.;Blumenberg, M.
波罗的海中部兰索深海的水柱被分层为好氧区、亚氧区和缺氧区。这种分层控制着个体微生物群落的分布和生物地球化学过程。2011年夏天，使用现场泵从这些区域过滤颗粒有机物。从过滤器中提取脂质生物标志物，以建立单个烃类、醇类、磷脂脂肪酸和细菌Hopane多元醇（BHP）的水柱特征。作为参考，对2012年夏季在波罗的海中部哥特兰深海采集的蓝藻水华进行了BHP分析。生物标志物数据从表层的氧化区显示，主要输入蓝藻，甲藻和纤毛虫，而底层的寒冷的冬季水层的特点是低多样性和丰富的生物，桡足类作为一个主要群体。亚氧区支持食菌纤毛虫，I型好氧甲烷细菌，硫酸盐还原菌，最有可能的是，产甲烷古菌。在缺氧区，硫酸盐还原菌和古菌是主要的微生物所示的存在下，独特的支链脂肪酸：古菌和五甲基二十烷（PMI）衍生物，分别。因此，我们在Landsort深原位生物标志物的研究提供了一个综合的洞察相关化合物的分布，并描述了有用的示踪剂，以重建分层水柱的地质记录。
The water column of the Landsort Deep, central Baltic Sea, is stratified into an oxic, suboxic, and anoxic zone. This stratification controls the distributions of individual microbial communities and biogeochemical processes. In summer 2011, particulate organic matter was filtered from these zones using an in situ pump. Lipid biomarkers were extracted from the filters to establish water-column profiles of individual hydrocarbons, alcohols, phospholipid fatty acids, and bacteriohopanepolyols (BHPs). As a reference, a cyanobacterial bloom sampled in summer 2012 in the central Baltic Sea Gotland Deep was analyzed for BHPs. The biomarker data from the surface layer of the oxic zone showed major inputs from cyanobacteria, dinoflagellates, and ciliates, while the underlying cold winter water layer was characterized by a low diversity and abundance of organisms, with copepods as a major group. The suboxic zone supported bacterivorous ciliates, type I aerobic methanotrophic bacteria, sulfate-reducing bacteria, and, most likely, methanogenic archaea. In the anoxic zone, sulfate reducers and archaea were the dominating microorganisms as indicated by the presence of distinctive branched fatty acids: archaeol and pentamethylicosane (PMI) derivatives, respectively. Our study of in situ biomarkers in the Landsort Deep thus provided an integrated insight into the distribution of relevant compounds and describes useful tracers to reconstruct stratified water columns in the geological record.