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Katarina Hedlund. Foto.

Katarina Hedlund

Professor

Katarina Hedlund. Foto.

Tritrophic interactions in a soil community enhance decomposition rates

Författare

  • Katarina Hedlund
  • Maria Sjögren Öhrn

Summary, in English

Microbivorous soil fauna can influence decomposition rates by regulating biomass and composition of the microbial community. The idea that predators at higher trophic levels regulate population densities of microbivorous fauna and thus indirectly increase microbial growth and activity has often been suggested but rarely examined in soil ecosystems. In this paper the effects of tritrophic interactions on decomposition processes in the soil are studied and expressed as soil respiration, hyphal lengths, cellulase and chitinase activities. The experiments were carried out in soil microcosms in a factorial design with three fungal species (Alternaria alternata, Fusarium oxysporum, Trichoderma viride), the fungivorous collembolan Folsomia fimetaria and the predatory mite Hypoaspis aculeifer. The respiration rate was significantly higher with three trophic levels than in those with two and lowest in those with only fungi present. This indicates that a low level of grazing stimulates microbial respiration more than a high level or no grazing at ail. The effect was similar for all three fungal species but most pronounced in microcosms with the fungus A. alternata which was a preferred food source by the collembolans. Hyphal lengths were in all cases but with T, viride reduced in the presence of collembolans and predatory mites. T. viride had a slightly higher chitinase activity than the other fungi but increased numbers of trophic levels did not affect the enzymatic activities of any of the fungi.

Avdelning/ar

  • Biodiversitet
  • Biologiska institutionen
  • Markgruppen

Publiceringsår

2000

Språk

Engelska

Sidor

585-591

Publikation/Tidskrift/Serie

Oikos

Volym

88

Issue

3

Dokumenttyp

Artikel i tidskrift

Förlag

Wiley-Blackwell

Ämne

  • Ecology

Status

Published

Forskningsgrupp

  • Soil Ecology

ISBN/ISSN/Övrigt

  • ISSN: 1600-0706