Exclusion of invertebrates influences saprotrophic fungal community and wood decay rate in an experimental field study

Rannveig M. Jacobsen, Anne Sverdrup-Thygeson, Håvard Kauserud, Sunil Mundra, Tone Birkemoe

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Decomposer communities perform an essential ecosystem function by recycling nutrients. However, the effect of higher trophic levels on microbial decomposer communities and rate of decomposition is poorly understood. We therefore conducted an exclusion experiment to test the effect of invertebrates on fungal decomposer communities in dead wood, repeated at 30 sites in two landscapes, and measured wood density to assess effect on decay rate. Invertebrates were excluded from recently cut logs by cages with a 1-mm-mesh net, and fungal communities in caged logs were compared to logs accessible to invertebrates by DNA metabarcoding analyses. Accessible logs included control logs, cage control logs and positive control logs. We found that exclusion of invertebrates had a significant effect on fungal community composition. For example, the wood decay fungi Trametes versicolor and T. ochraceawere significantly more abundant in accessible logs than in caged logs. The strongest effect on fungal community composition, however, was attributed to differing baseline conditions in the individual trees. When accounting for these baseline differences, caged logs had significantly higher wood density than control logs after 2 years, indicating lower rates of wood decay in caged logs. Further studies, spanning several years, are required to fully understand the influence of invertebrates on fungi and wood decay. However, our results indicate that invertebrates influence both the composition of saprotrophic communities in dead wood and their decomposition function, which is vital to forest ecosystems. A plain language summary is available for this article.

Original languageEnglish
Pages (from-to)2571-2582
Number of pages12
JournalFunctional Ecology
Volume32
Issue number11
DOIs
Publication statusPublished - Nov 2018
Externally publishedYes

Keywords

  • DNA
  • community assembly
  • dead wood
  • decomposition
  • high-throughput sequencing
  • insects
  • saproxylic
  • top-down

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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