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Microbial Ecology

, 50:396 | Cite as

Microbial Assemblages in Soil Microbial Succession After Glacial Retreat in Svalbard (High Arctic)

  • Klára KaštovskáEmail author
  • Josef Elster
  • Marek Stibal
  • Hana Šantrůčková
Article

Abstract

Microbial community composition (cyanobacteria and eukaryotic microalgae abundance and diversity, bacterial abundance, and soil respiration) was studied in subglacial and periglacial habitats on five glaciers near Ny-Ålesund, Svalbard (79°N). Soil microbial communities from nonvegetated sites (subglacial, recently deglaciated, and cryoconite sediments) and sites with plant cover (deglaciated some hundreds of years ago) were analyzed. Physicochemical analyses (pH, texture, water content, organic matter, total C and N content) were also performed onthesamples. In total, 57 taxa of 23 genera of cyanobacteriaand algae were identified. Algae from the class Chlorophyceae (25 species) and cyanobacteria (23 species) were richest in biodiversity. The numbers of identified species in single habitat types were 23 in subglacial, 39 inbarren, 22 in cryoconite, and 24 in vegetated soils. The highest cyanobacterial and algal biovolume and cell numbers, respectively, were present in cryoconite (13 × 104 μm3 mg−1 soil and 508 cells per mg of soil), followed by barren (5.7× 104 and 188), vegetated (2.6 × 104 and 120), and subglacial (0.1 × 104 and 5) soils. Cyanobacteria prevailed in all soil samples. Algae (mainly green algae) were present only as accessory organisms. The density of bacteria showed a slightly different trend to that of the cyanobacterial and algal assemblages. The highest number of bacteria was present in vegetated (mean: 13,722 × 108 cells per mg of soil dry wt.), followed by cryoconite (3802 × 108), barren (654 × 108), and subglacial (78 × 108) soils. Response of cyanobacteria and algae to physical parameters showed that soil texture and water content are important for biomass development. In addition, it is shown that nitrogen and water content are the main factors affecting bacterial abundance and overall soil respiration. Redundancy analysis (RDA) with forward selection was used to create a model explaining variability in cyanobacterial, algal, and bacterial abundance. Cryoconites accounted for most of the variation in cyanobacteria and algae biovolume, followed by barren soils. Oscillatoriales, desmids, and green coccoid algae preferred cryoconites, whereas Nostocales and Chroococcales occurred mostly in barren soils. From the data obtained, it is evident that of the studied habitats cryoconite sediments are the most suitable ones for the development of microbial assemblages. Although subglacial sediments do not provide as good conditions as cryoconites, they support thesurvival of microbial communities. Both mentioned habitats are potential sources for the microbial recolonization of freshly deglaciated soil after the glacier retreat.

Keywords

Soil Respiration Barren Soil Nostocales Bacterial Abundance Basal Respiration 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We gratefully acknowledge financial support from the European Union Large Scale Facility Programme for Ny-Ålesund (LSF-82/2002), the Grant Agency of the Ministry of Education of the Czech Republic (MSM 123100004, KONTAKT-ME 576) and the EU Commission Grant Quality of Life and Living Resources QLRT-2000-01645 (COBRA). We are also very grateful to Professor William Block (British Antarctic Survey) for his support throughout the study and his critical comments on the manuscript; to Nick Cox for his support during our fieldwork at Ny-Ålesund; and to Pavel Hrouzek for his help with statistical analyses.

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Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • Klára Kaštovská
    • 1
    Email author
  • Josef Elster
    • 1
    • 2
  • Marek Stibal
    • 1
    • 2
  • Hana Šantrůčková
    • 2
  1. 1.Institute of BotanyAcademy of Sciences of the Czech RepublicTřeboňCzech Republic
  2. 2.Faculty of Biological SciencesUniversity of South BohemiaČeské BudějoviceCzech Republic

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