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首页> 外文期刊>Polar biology >Distribution and abiotic influences on hypolithic microbial communities in an Antarctic Dry Valley
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Distribution and abiotic influences on hypolithic microbial communities in an Antarctic Dry Valley

机译：分布和非生物影响对南极干旱谷的次石质微生物群落

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摘要

The Miers Valley within the McMurdo Dry Valleys of Antarctica supports abundant quartz and marble substrates for hypolithons-microbial colonists on the underside of these translucent rocks. Three physically distinct hypolithic community types have been identified: cyanobacteria dominated (Type I), fungus dominated (Type II) or moss dominated (Type III). The distribution of the three types was mapped across much of the ~ 75 km2 area of the upper Miers Valley and correlated this with the measurements of selected micro-environmental variables. Type I hypolithons were most common and occurred at all altitudes up to 824 m, whilst Type II and Type III hypolithons were less abundant and restricted to lower altitudes on the valley floor (<415 m and <257 m, respectively). Whilst all colonized quartz effectively filtered incident UVB irradiance, transmittance levels for UVA and PAR varied markedly and were significant in determining hypolith type. Notably, the Type I hypolithons occurred under rocks with a significantly lower transmittance of photosynthetically active radiation than Type II and III hypolithons. Altitude and aspect were also significant factors determining hypolith type, and a role for altitude-related abiotic variables in determining the distribution of Type I, II and III hypolithons is proposed.
机译：南极麦克默多干旱谷内的米尔斯谷在这些半透明岩石的底面支撑着丰富的石英和大理石底物，以供次要石微生物殖民者使用。已经确定了三种物理上不同的下石器时代群落类型：以蓝细菌为主（I型），以真菌为主（II型）或以苔藓为主（III型）。将这三种类型的分布图绘制在米尔斯河谷上游〜75 km2的大部分区域中，并将其与选定的微环境变量的测量结果相关联。 I型次石流最常见，发生在海拔最高824 m的所有高度，而II型和III型次石流则数量较少，并且仅限于谷底较低的海拔（分别为<415 m和<257 m）。尽管所有定居石英均能有效过滤入射的UVB辐照度，但UVA和PAR的透射率水平却存在显着差异，并且在确定菌石类型方面具有重要意义。值得注意的是，I型次岩体发生在岩石下，光合有效辐射的透射率明显低于II型和III型岩体。高度和坡向也是决定岩性类型的重要因素，并提出了与海拔相关的非生物变量在确定I，II和III型岩性体分布中的作用。

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  • 来源
    《Polar biology》 |2011年第2期|p.307-311|共5页
  • 作者

    Don A. Cowan; Stephen B. Pointing; Mark I. Stevens; S. Craig Cary; Francesca Stomeo; I. Maria Tuffin;

  • 作者单位

    Institute for Microbial Biotechnology and Metagenomics, University of the Western Cape, Bellville 7535, Cape Town, South Africa;

    School of Biological Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China;

    South Australian Museum, Adelaide, SA 5000, Australia;

    Department of Biological Sciences, University of Waikato, Private Bag, Hamilton, New Zealand,University of Delaware Graduate College of Marine Studies, 700 Pilottown Rd., Lewes, DE 19958, USA;

    Institute for Microbial Biotechnology and Metagenomics, University of the Western Cape, Bellville 7535, Cape Town, South Africa;

    Institute for Microbial Biotechnology and Metagenomics, University of the Western Cape, Bellville 7535, Cape Town, South Africa;

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  • 正文语种 eng
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  • 关键词

    miers valley; antarctica; cryptic microbial communities; hypolithons; microniches;

    机译：米尔斯谷南极洲;隐秘的微生物群落;假说微壁ni;

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