Archaeal ammonia oxidizers respond to soil factors at smaller spatial scales than the overall archaeal community does in a high arctic polar oasis

Samiran Banerjee, Nabla Kennedy, Alan E. Richardson, Keith N. Egger, Steven D. Siciliano

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Archaea are ubiquitous and highly abundant in Arctic soils. Because of their oligotrophic nature, archaea play an important role in biogeochemical processes in nutrient-limited Arctic soils. With the existing knowledge of high archaeal abundance and functional potential in Arctic soils, this study employed terminal restriction fragment length polymorphism (t-RFLP) profiling and geostatistical analysis to explore spatial dependency and edaphic determinants of the overall archaeal (ARC) and ammonia-oxidizing archaeal (AOA) communities in a high Arctic polar oasis soil. ARC communities were spatially dependent at the 2–5 m scale (P < 0.05), whereas AOA communities were dependent at the 1 m scale (P < 0.0001). Soil moisture, pH, and total carbon content were key edaphic factors driving both the ARC and AOA community structure. However, AOA evenness had simultaneous correlations with dissolved organic nitrogen and mineral nitrogen, indicating a possible niche differentiation for AOA in which dry mineral and wet organic soil microsites support different AOA genotypes. Richness, evenness, and diversity indices of both ARC and AOA communities showed high spatial dependency along the landscape and resembled scaling of edaphic factors. The spatial link between archaeal community structure and soil resources found in this study has implications for predictive understanding of archaea-driven processes in polar oases.

Original languageEnglish
Pages (from-to)485-491
Number of pages7
JournalCanadian Journal of Microbiology
Volume62
Issue number6
DOIs
Publication statusPublished - 2016

Keywords

  • 16S rRNA
  • AmoA
  • Archaea
  • Spatial scale
  • t-RFLP

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