Melanization of mycorrhizal fungal necromass structures microbial decomposer communities

Christopher W. Fernandez, Peter G Kennedy

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Mycorrhizal fungal necromass is increasingly recognized as an important contributor to soil organic carbon pools, particularly in forest ecosystems. While its decomposition rate is primarily determined by biochemical composition, how traits such as melanin content affect the structure of necromass decomposer communities remains poorly understood. To assess the role of biochemical traits on microbial decomposer community composition and functioning, we incubated melanized and non-melanized necromass of the mycorrhizal fungus Meliniomyces bicolor in Pinus- and Quercus-dominated forests in Minnesota, USA and then assessed the associated fungal and bacterial decomposer communities after 1, 2 and 3 months using high-throughput sequencing. Melanized necromass decomposed significantly slower than non-melanized necromass in both forests. The structure of the microbial decomposer communities depended significantly on necromass melanin content, although the effect was stronger for fungi than bacteria. On non-melanized necromass, fungal communities were dominated by r-selected ascomycete and mucoromycete microfungi early and then replaced by basidiomycete ectomycorrhizal fungi, while on melanized necromass these groups were co-dominant throughout the incubation. Bacterial communities were dominated by both specialist mycophageous and generalist taxa. Synthesis. Our results indicate that necromass biochemistry not only strongly affects rates of decomposition but also the structure of the associated decomposer communities. Furthermore, the observed colonization patterns suggest that fungi, and particularly ectomycorrhizal fungi, may play a more important role in necromass decomposition than previously recognized.

Original languageEnglish (US)
Pages (from-to)468-479
Number of pages12
JournalJournal of Ecology
Volume106
Issue number2
DOIs
StatePublished - Mar 1 2018

Fingerprint

melanization
microbial communities
microbial community
fungus
melanin
decomposition
fungi
biochemical composition
biochemistry
bacterial communities
generalist
forest ecosystem
community composition
degradation
colonization
incubation
organic carbon
necromass
bacterium
fungal communities

Keywords

  • bacteria
  • carbon cycle
  • decomposition
  • fungi
  • melanin
  • mycorrhizal fungi
  • necromass
  • nitrogen cycle

Cite this

Melanization of mycorrhizal fungal necromass structures microbial decomposer communities. / Fernandez, Christopher W.; Kennedy, Peter G.

In: Journal of Ecology, Vol. 106, No. 2, 01.03.2018, p. 468-479.

Research output: Contribution to journalArticle

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