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Variability of protistan and bacterial communities in two Arctic fjords (Spitsbergen)

机译：北极两个峡湾中原生质和细菌群落的变异性（Spitsbergen）

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摘要

Krossfjorden and Kongsfjorden are Arctic fjords on the western side of Spitsbergen. These fjords share a common mouth to the open sea, and both are influenced by the input of sediment-rich glacial meltwater leading to decreased surface salinity, increased turbidity and decreased light penetration during summer. Earlier classical taxonomic studies had described the pelagic protistan composition of the Kongsfjorden during summer, revealing the dominance of flagellates of often unresolved taxonomic origin. Only little information existed on microbial eukaryote composition of the Krossfjorden as well as the bacterial composition of both fjords. The aim of the present study was to analyze and compare surface summertime protistan and bacterial communities in both fjords, using molecular approaches (16S and 18S rRNA DGGE, sequencing). Samples were collected three times a week from the central Kongsfjorden over a 1-monthrnperiod. Additionally, 10 marine and 2 freshwater sites were sampled within a 1-week period in both Kongsfjorden and Krossfjorden. The central Kongsfjorden revealed a relatively stable protistan community over time with dinoflagellates, chlorophytes and small heterotrophs dominating. In contrast, the bacterial community varied over time and appeared to be correlated with the inflow of glacial meltwater. The Kongsfjorden and Krossfjorden were found to harbor distinctive bacterial and eukaryotic communities. We speculate that differences in glacial meltwater composition and fjord bathymetry affect the surface water properties and therefore the observed spatial variability in the community fingerprints.
机译：Krossfjorden和Kongsfjorden是Spitsbergen西侧的北极峡湾。这些峡湾与大海共享一个共同的入口，并且都受到富含沉积物的冰川融水的输入的影响，从而导致夏季地表盐度降低，浊度增加和光线穿透率降低。较早的经典分类学研究已经描述了孔斯峡湾在夏季的中上层protistan组成，揭示了通常未解决分类学来源的鞭毛虫的优势。关于克罗斯峡湾的微生物真核生物组成以及两个峡湾的细菌组成只有很少的信息。本研究的目的是使用分子方法（16S和18S rRNA DGGE，测序）来分析和比较两个峡湾的夏季夏季Protstan和细菌群落。在为期1个月的时间里，每周从中央孔斯菲厄登中心抽取样品三次。此外，在1周内在Kongsfjorden和Krossfjorden采样了10个海洋和2个淡水站点。随着时间的推移，Kongsfjorden的中部地区发现了一个相对稳定的原生动物群落，其中鞭毛藻，叶绿体和小的异养生物占主导地位。相反，细菌群落随时间变化，并且似乎与冰川融水的流入有关。发现Kongsfjorden和Krossfjorden拥有独特的细菌和真核生物群落。我们推测，冰川融水成分和峡湾测深法的差异会影响地表水的性质，从而影响到群落指纹的空间变异性。

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  • 来源
    《Polar biology》 |2010年第11期|p.1521-1536|共16页
  • 作者

    A. M.-T. Piquet; J. F. Scheepens; H. Bolhuis; C. Wiencke; A. G. J. Buma;

  • 作者单位

    Department of Ocean Ecosystems, Energy and Sustainability Research Institute Groningen, University of Groningen,Kerklaan 30, 9750 AA Haren, The Netherlands;

    rnDepartment of Ocean Ecosystems, Energy and Sustainability Research Institute Groningen, University of Groningen,Kerklaan 30, 9750 AA Haren, The Netherlands Botanisches Institut der Universitaet Basel,Schoenbeinstrasse 6,4056 Basel, Switzerland;

    rnDepartment of Marine Microbiology, Centre for Estuarine and Marine Ecology, NIOO-CEME, Korringaweg 7,4401 NT Yerseke, The Netherlands;

    rnAlfred Wegener Institute for Polar and Marine Research,Am Handelshafen 12, 27570 Bremerhaven, Germany;

    rnDepartment of Ocean Ecosystems, Energy and Sustainability Research Institute Groningen, University of Groningen,Kerklaan 30, 9750 AA Haren, The Netherlands;

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  • 关键词

    marine microbes; DGGE; sequencing; climate change; meltwater; polar; kongsfjorden; krossfjorden;

    机译：海洋微生物;DGGE;排序气候变化;融水极性;kongsfjorden;克罗斯峡湾;

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