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首页> 外文期刊>Polar biology >Community structure and photosynthetic activity of benthic biofilms from a waterfall in the maritime Antarctica
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Community structure and photosynthetic activity of benthic biofilms from a waterfall in the maritime Antarctica

机译：海洋南极洲瀑布底栖生物膜的群落结构和光合活性

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摘要

High-energy flowing water habitats such as waterfalls are uncommon in Antarctica, though they may become more regular as temperature increase. Both high spatial and temporal environmental variability is expected on them. The extent of their biological colonization will depend on the amount of ecological strategies displayed by the surrounding biota. We report here a study on photo-trophic microbenthic communities inhabiting such environment in a stream on the Byers Peninsula of Livingston Island. Five different biofilms were distinguished by colour, and were located in specific microhabitat types in the waterfall, which flowed down a steep canyon. Photosynthetic pigment content and microscopic observations demonstrated a different assemblage of chlorophytes, cyanobacteria and diatoms among them. Biofilms were not randomly distributed in the stream channel, which may be related to water flow, nutrient availability and moisture. The exopolymeric substances content, stoichiometry and pigment composition varied among biofilms, likely reflecting differences in the water and nutrients availability. The photosynthetic rates were in the range of the observed in previous studies in the site and varied according to the habitat within the stream. Communities dominated by chlorophytes were restricted to the central channel, suggesting adaptation to faster flow regime. However, cyanobacterial biofilms appeared in a great range of environmental conditions. They were rare in the central channel where water flow was greatest, but achieved large biomass stocks on submerged and even exposed sites in the splash zone at the edge of the flowing water. This study shows how Antarctic biofilms can have a large variability in community structure and biomass over short length scales, reflecting the range of microhabitats in this Antarctic waterfall ecosystem, and the potential occurrence of different strategies to overcome fluctuating conditions.
机译：高能流水栖息地（例如瀑布）在南极洲并不常见，尽管随着温度升高它们会变得更加规则。预期它们在空间和时间上都会有很大的变化。它们的生物定殖程度将取决于周围生物群展示的生态策略的数量。我们在这里报告一项关于在利文斯顿岛的拜尔斯半岛溪流中栖息于此类环境的光养性微底栖动物群落的研究。五种不同的生物被膜按颜色区分，并位于瀑布中特定的微生境类型，瀑布从陡峭的峡谷中流下来。光合色素含量和显微观察表明，其中的绿藻，蓝藻和硅藻组成不同。生物膜未在河道中随机分布，这可能与水流量，养分利用率和水分有关。生物膜中外聚合物质的含量，化学计量和色素组成各异，可能反映了水和养分利用率的差异。光合速率在该地点先前研究中观察到的范围内，并根据溪流中的生境而变化。叶绿素占主导的社区被限制在中央通道，这表明它们适应了更快的流动状态。然而，蓝细菌生物膜出现在很大范围的环境条件下。它们在水流量最大的中央河道中很少见，但在流水边缘的溅水区中甚至淹没甚至暴露的地方获得了大量生物量。这项研究表明，南极生物膜如何在较短的尺度上具有较大的群落结构和生物量变异性，反映出该南极瀑布生态系统中微生境的范围以及克服波动条件的不同策略的潜在可能性。

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  • 来源
    《Polar biology》 |2013年第12期|1709-1722|共14页
  • 作者

    Carlos Rochera; Eduardo Fernandez-Valiente; Bart Van de Vijver; Eugenio Rico; Manuel Toro; Warwick F. Vincent; Antonio Quesada; Antonio Camacho;

  • 作者单位

    Departamento de Microbiologia y Ecologfa, Instituto Cavanilles de Biodiversidad y Biologia Evolutiva, Edificio de Investigacion,Campus de Burjassot, Universitat de Valencia, 46100 Burjassot,Spain;

    Departamento de Biologia, Universidad Autonoma de Madrid,28049 Madrid, Spain;

    Department of Bryophytes and Thallophytes, National Botanic Garden of Belgium, Domein van Bouchout, 1860 Meise,Belgium;

    Departamento de Ecologia, Universidad Autonoma de Madrid,28049 Madrid, Spain;

    Centra de Estudios Hidrograficos, CEDEX, 28005 Madrid, Spain;

    Departement de Biologie, Centre d'Etudes Nordiques, Universite Laval, Sainte-Foy, QC G1K 7P4, Canada;

    Departamento de Biologia, Universidad Autonoma de Madrid,28049 Madrid, Spain;

    Departamento de Microbiologia y Ecologfa, Instituto Cavanilles de Biodiversidad y Biologia Evolutiva, Edificio de Investigacion,Campus de Burjassot, Universitat de Valencia, 46100 Burjassot,Spain;

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  • 正文语种 eng
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  • 关键词

    Byers Peninsula; Cyanobacteria; Diatoms; Exopolymeric substances; Inorganic; carbon uptake; Stoichiometry;

    机译：拜尔斯半岛;蓝细菌;硅藻;外聚物质;无机;碳吸收化学计量;

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