Lipid biomarker signatures as tracers for harmful cyanobacterial blooms in the Baltic Sea.
Lipid biomarker signatures as tracers for harmful cyanobacterial blooms in the Baltic Sea.
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DOI：
10.1371/journal.pone.0186360
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发表时间：
2017
期刊：
影响因子：
3.7
通讯作者：
Schwark L
中科院分区：
文献类型：
--
作者：
Bauersachs T;Talbot HM;Sidgwick F;Sivonen K;Schwark L
最近在波罗的海和其他边缘海有害蓝藻水华的扩散对受感染生态系统的健康构成了严重威胁，例如蓝藻生物量的大量出口和腐烂促进了底层水缺氧的蔓延。有证据表明，氰赤潮反复发生在波罗的海，但他们的时空分布和蓝藻，有助于他们的知识是有限的。在这项研究中，我们研究了代表的主要水华形成异囊蓝藻（即Aphanizomenon，Dolichospermum（原鱼腥藻）和Nodularia）建立脂质指纹，允许跟踪这些环境重要的固氮生物在现代和过去的波罗的海。正常和中链支链烷烃，脂肪酸甲酯，bacteriophopanepolyols和heterocyte糖脂的分布允许一个明确的化学分类分离的不同heterocystous蓝藻，但也表明了密切的系统发育关系的属Aphanizomenon和Dolichospermum的代表之间。与浮游植物调查研究的不连续性相比，这里报告的不同脂质分布将允许获得详细的时空信息的频率和强度的波罗的海cyanoHABs以及它们的社区组成使用的时间集成的生物标志物的签名记录在表面和地下沉积物。作为heterocystous蓝藻属Aphanizomenon，Dolichospermum和Nodularia通常被称为形成大量的水华在世界各地的许多半咸水以及湖泊系统，在这项研究中引入的化学分类标记可能允许调查cyanoHABs在当代环境中的各种各样的极地到热带纬度。
The recent proliferation of harmful cyanobacterial blooms (cyanoHABs) in the Baltic and other marginal seas poses a severe threat for the health of infested ecosystems as e.g. the massive export and decay of cyanobacterial biomass facilitates the spread of bottom water hypoxia. There is evidence that cyanoHABs occurred repeatedly in the Baltic Sea but knowledge of their spatiotemporal distribution and the cyanobacteria that contributed to them is limited. In this study, we examined representatives of the major bloom-forming heterocystous cyanobacteria (i.e. Aphanizomenon, Dolichospermum (formerly Anabaena) and Nodularia) to establish lipid fingerprints that allow tracking these environmentally important diazotrophs in the modern and past Baltic Sea. The distribution of normal and mid-chain branched alkanes, fatty acid methyl esters, bacteriohopanepolyols and heterocyst glycolipids permitted a clear chemotaxonomic separation of the different heterocystous cyanobacteria but also indicated a close phylogenetic relationship between representatives of the genera Aphanizomenon and Dolichospermum. Compared to the discontinuous nature of phytoplankton surveys studies, the distinct lipid profiles reported here will allow obtaining detailed spatiotemporal information on the frequency and intensity of Baltic Sea cyanoHABs as well as their community composition using the time-integrated biomarker signatures recorded in surface and subsurface sediments. As heterocystous cyanobacteria of the genera Aphanizomenon, Dolichospermum and Nodularia are generally known to form massive blooms in many brackish as well as lacustrine systems worldwide, the chemotaxonomic markers introduced in this study may allow investigating cyanoHABs in a great variety of contemporary environments from polar to tropical latitudes.
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影响因子：
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通讯作者：
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