Microbial community dynamics in the forefield of glaciers

James A Bradley, Joy S Singarayer, Alexandre M Anesio

Research output: Contribution to journalArticle (Academic Journal)peer-review

68 Citations (Scopus)
300 Downloads (Pure)

Abstract

Retreating ice fronts (as a result of a warming climate) expose large expanses of deglaciated forefield, which become colonized by microbes and plants. There has been increasing interest in characterizing the biogeochemical development of these ecosystems using a chronosequence approach. Prior to the establishment of plants, microbes use autochthonously produced and allochthonously delivered nutrients for growth. The microbial community composition is largely made up of heterotrophic microbes (both bacteria and fungi), autotrophic microbes and nitrogen-fixing diazotrophs. Microbial activity is thought to be responsible for the initial build-up of labile nutrient pools, facilitating the growth of higher order plant life in developed soils. However, it is unclear to what extent these ecosystems rely on external sources of nutrients such as ancient carbon pools and periodic nitrogen deposition. Furthermore, the seasonal variation of chronosequence dynamics and the effect of winter are largely unexplored. Modelling this ecosystem will provide a quantitative evaluation of the key processes and could guide the focus of future research. Year-round datasets combined with novel metagenomic techniques will help answer some of the pressing questions in this relatively new but rapidly expanding field, which is of growing interest in the context of future large-scale ice retreat.
Original languageEnglish
Article number20140882
Number of pages9
JournalProceedings of the Royal Society B: Biological Sciences
Volume281
Issue number1795
Early online date1 Oct 2014
DOIs
Publication statusPublished - 22 Nov 2014

Keywords

  • deglaciated forefield soils
  • chronosequence
  • microbial succession
  • colonization
  • modelling
  • nutrient cycling

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