Oomycetes along a 120,000 year temperate rainforest ecosystem development chronosequence

Ian A. Dickie*, Angela M. Wakelin, Laura B. Martínez-García, Sarah J. Richardson, Andreas Makiola, Jason M. Tylianakis

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)

Abstract

The occurrence of plant-associated oomycetes in natural ecosystems and particularly during long-term ecosystem development is largely unknown. Using DNA sequencing, we investigated the frequency and host relationships of plant-root-associated oomycete communities along a 120 000 y glacial chronosequence, comprising site ages with rapid compositional change (“early succession”; 5–70 y old soil); relatively stable higher-diversity sites (“mature” 280–12000 y); and ancient, nutrient-limited soils with declining plant biomass and stature (“retrogression” 60 000, 120 000 y). Plant-associated oomycetes were frequent in early successional sites, occurring in 38–65% of plant roots, but rare (mean 3%) in all older ecosystems. Oomycete OTUs occurred non-randomly with plant host species, and were more frequent on those plant species that declined most strongly in abundance between ecosystem ages. While oomycetes were common in early succession, their absence in older sites suggests a limited role in later stages of ecosystem development.

Original languageEnglish
Pages (from-to)192-200
Number of pages9
JournalFungal Ecology
Volume39
DOIs
Publication statusPublished - 1 Jun 2019

Keywords

  • Forest diversity
  • Lagena
  • Molecular ecology
  • Oomycetes
  • Pedogenesis
  • Plant–soil (below-ground) interactions
  • Retrogression
  • Succession

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