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首页> 外文期刊>Estuarine Coastal and Shelf Science >Seasonal variations of the composition of microbial biofilms in sandy tidal flats: Focus of fatty acids, pigments and exopolymers
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Seasonal variations of the composition of microbial biofilms in sandy tidal flats: Focus of fatty acids, pigments and exopolymers

机译：沙质滩涂中微生物生物膜组成的季节性变化：脂肪酸，色素和外聚合物的焦点

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摘要

Biofilms, or microbial mats, are common associations of microorganisms in tidal flats; they generally consist of a large diversity of organisms embedded in a matrix of Extracellular Polymeric Substances (EPS). These molecules are mainly composed of carbohydrates and proteins, but their detailed monomer compositions and seasonal variations are currently unknown. Yet this composition determines the numerous roles of biofilms in these systems. This study investigated the changes in composition of carbohydrates in intertidal microbial mats over a year to decipher seasonal variations in biofilms and in varying hydrodynamic conditions. This work also aimed to assess how these compositions are related to microbial assemblages. In this context, natural biofilms whose development was influenced or not by artificial structures mimicking polychaete tubes were sampled monthly for over a year in intertidal flats of the Chausey archipelago. Biofilms were compared through the analysis of their fatty acid and pigment contents, and the monosaccharide composition of their EPS carbohydrates. Carbohydrates from both colloidal and bound EPS contained mainly glucose and, to a lower extent, galactose and mannose but they showed significant differences in their detailed monosaccharide compositions. These two fractions displayed different seasonal evolution, even if glucose accumulated in both fractions in summer; bound EPS only were affected by artificial biogenic structures. Sediment composition in fatty acids and pigments showed that microbial communities were dominated by diatoms and heterotrophic bacteria. Their relative proportions, as well as those of other groups like cryptophytes, changed between times and treatments. The changes in EPS composition were not fully explained by modifications of microbial assemblages but also depended on the processes taking place in sediments and on environmental conditions. These variations of EPS compositions are likely to alter different ecosystem processes such as biostabilisation or pollutants trapping.
机译：生物膜或微生物垫是潮滩中微生物的常见结合体。它们通常由嵌入细胞外聚合物（EPS）基质中的多种生物组成。这些分子主要由碳水化合物和蛋白质组成，但是目前尚不清楚它们的详细单体组成和季节性变化。然而，这种成分决定了生物膜在这些系统中的众多作用。这项研究调查了潮间带微生物垫中碳水化合物的组成在一年中的变化，以揭示生物膜和不同水动力条件下的季节性变化。这项工作还旨在评估这些成分与微生物组合之间的关系。在这种情况下，在乔塞伊群岛潮间带的每个月中，对自然生物膜的发育进行了一年以上的采样，而这些生物膜的发育是否受到模仿多cha鱼管的人工结构的影响。通过分析生物膜的脂肪酸和色素含量以及其EPS碳水化合物的单糖组成，对生物膜进行了比较。来自胶体和结合的EPS的碳水化合物主要包含葡萄糖，并在较低程度上包含半乳糖和甘露糖，但它们在详细的单糖组成上显示出显着差异。这两个部分显示出不同的季节性变化，即使夏季两个部分中都积累了葡萄糖。结合的EPS仅受人造生物基因结构的影响。脂肪酸和色素中的沉积物组成表明，微生物群落主要由硅藻和异养细菌组成。它们的相对比例，以及其他种类（如隐藻类）的相对比例，在时间和处理方式之间有所变化。 EPS组成的变化没有通过微生物组合的改变得到充分解释，但也取决于沉积物中发生的过程和环境条件。 EPS组成的这些变化可能会改变不同的生态系统过程，例如生物稳定或污染物捕获。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2015年第5期|29-37|共9页
  • 作者

    Claire Passarelli; Tarik Meziane; Najet Thiney; Dominique Boeuf; Bruno Jesus; Mickael Ruivo; Christian Jeanthon; Cedric Hubas;

  • 作者单位

    UMR BOREA 7208 CNRS/MNHN/UPMC/IRD, Museum National d'Histoire Naturelle, Batiment des Arthropodes, CP53, 61 rue Buffon, 75231 Paris Cedex 5, France;

    UMR BOREA 7208 CNRS/MNHN/UPMC/IRD, Museum National d'Histoire Naturelle, Batiment des Arthropodes, CP53, 61 rue Buffon, 75231 Paris Cedex 5, France;

    UMR BOREA 7208 CNRS/MNHN/UPMC/IRD, Museum National d'Histoire Naturelle, Batiment des Arthropodes, CP53, 61 rue Buffon, 75231 Paris Cedex 5, France;

    UPMC, Univ Paris Ⅵ, UMR 7144, Adaptation et Diversite en Milieu Marin, Station Biologique, 29680 Roscoff, France,CNRS, UMR 7144, Adaptation et Diversite en Milieu Marin, Station Biologique, 29680 Roscoff, France;

    LUNAM Universite, Universite de Nantes, Mer Molecules Sante EA 2160, Faculte des Sciences et Techniques, B.P. 92208, 44322 Nantes Cedex 3, France,Centro de Biodiversidade, Genomica Integrativa e Funcional (BioFIG), Faculdade de Ciencias, Universidade de Lisboa, 1749-016 Lisboa, Portugal;

    Centro de Biodiversidade, Genomica Integrativa e Funcional (BioFIG), Faculdade de Ciencias, Universidade de Lisboa, 1749-016 Lisboa, Portugal;

    UPMC, Univ Paris Ⅵ, UMR 7144, Adaptation et Diversite en Milieu Marin, Station Biologique, 29680 Roscoff, France,CNRS, UMR 7144, Adaptation et Diversite en Milieu Marin, Station Biologique, 29680 Roscoff, France;

    UMR BOREA 7208 CNRS/MNHN/UPMC/IRD, Museum National d'Histoire Naturelle, Batiment des Arthropodes, CP53, 61 rue Buffon, 75231 Paris Cedex 5, France;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    biofilms; biogenic structures; EPS; monosaccharide composition; fatty acids; pigments;

    机译：生物膜生物结构;每股收益;单糖成分脂肪酸;颜料;

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