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Spatial and temporal variability in nitrogenase activity and diazotrophic community composition in coastal microbial mats

机译：沿海微生物垫中固氮酶活性和重氮营养群落组成的时空变化

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摘要

Coastal microbial mats are highly diverse micro-scale ecosystems in an environment characterized by strongly fluctuating conditions. Nitrogen (N) fixation is an important process in these often N-limited ecosystems. We investigated the characteristics of N_2 fixation and the composition of the N_2-fixing (diazotrophic) community in 3 microbial mats situated along an intertidal gradient over a period of 3 yr by using the acetylene reduction assay and by analyzing more than 800 environmental nifH sequences. In 2008, nitrogenase activity (NA) in the 3 mat types differed with respect to the daily pattern and daily integrated rates (ranging from 5 to almost 150 mmol C_2H_4 m~(-2) d~(-1)). The diazotrophic community composition in the 3 mat types was also dissimilar. The nifH clone libraries at the location that was most influenced by freshwater contained mostly cyanobacterial and alphaproteobacterial sequences, whereas the other 2 locations were dominated by gamma- and deltaproteobacterial diazotrophs. These differences were attributed to the specific environmental conditions at each location resulting from their position along the intertidal gradient and likely caused the differences in the recorded patterns of N_2 fixation. Moreover, in each of the mat types, a dramatic shift in the diazotrophic community was observed over a period of 2 to 3 yr. These shifts varied greatly between the locations. The characteristics of NA at the same location in different years also varied considerably. N_2 fixation in these microbial mats was spatially and temporally variable, which was attributed to the shifts in diazotrophic community composition along the littoral gradient and during the 3 yr of investigation.
机译：沿海微生物垫是在条件剧烈波动的环境中高度多样化的微型生态系统。在这些经常受到氮限制的生态系统中，固氮是一个重要的过程。我们通过使用乙炔还原试验并分析了800多个环境nifH序列，研究了3年内沿潮间带梯度分布的3个微生物垫中N_2固定的特征和N_2固定（营养化）群落的组成。 2008年，三种垫子的固氮酶活性（NA）在日模式和日综合速率方面有所不同（范围从5至近150 mmol C_2H_4 m〜（-2）d〜（-1））。 3种垫子类型的重氮营养群落组成也不同。 nifH克隆文库在受淡水影响最大的位置主要包含蓝细菌和α变形细菌序列，而其他2个位置则主要由γ和δ变形细菌重氮菌组成。这些差异归因于每个位置的特定环境条件，这是由于它们沿潮间带梯度的位置而造成的，并且可能导致了N_2固定记录模式的差异。此外，在每种垫子类型中，在2至3年的时间里都观察到了重氮营养群落的巨大变化。这些位置之间的变化很大。不同年份同一地点的NA的特征也相差很大。这些微生物垫中的N_2固定在空间和时间上是可变的，这归因于重氮营养群落组成沿滨海梯度和研究3年的变化。

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  • 来源
    《Marine ecology progress series》 |2010年第4期|p.13-25|共13页
  • 作者

    Ina Severin; Lucas J. Stal;

  • 作者单位

    Department of Marine Microbiology, Netherlands Institute of Ecology, NIOO-KNAW, PO Box 140, 4400 AC Yerseke, The Netherlands;

    Department of Marine Microbiology, Netherlands Institute of Ecology, NIOO-KNAW, PO Box 140, 4400 AC Yerseke, The Netherlands,Department of Aquatic Microbiology, Institute of Biodiversity and Ecosystem Dynamics, University of Amsterdam, PO Box 94062, 1090 GB Amsterdam, The Netherlands;

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  • 正文语种 eng
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  • 关键词

    microbial mats; nitrogenase activity; diazotrophic community;

    机译：微生物垫固氮酶活性重氮营养群落;

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