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Experimental and Applied Acarology

, Volume 64, Issue 1, pp 49–60 | Cite as

Nematode consumption by mite communities varies in different forest microhabitats as indicated by molecular gut content analysis

  • Kerstin HeidemannEmail author
  • Liliane Ruess
  • Stefan Scheu
  • Mark Maraun
Article

Abstract

Soil animals live in complex and heterogeneous habitats including litter of various types but also microhabitats such as mosses, fungal mats and grass patches. Soil food webs have been separated into a slow fungal and a fast bacterial energy channel. Bacterial-feeding nematodes are an important component of the bacterial energy channel by consuming bacteria and forming prey for higher trophic levels such as soil microarthropods. Investigating the role of nematodes as prey for higher trophic level consumers has been hampered by methodological problems related to their small body size and lack in skeletal structures which can be traced in the gut of consumers. Recent studies using molecular gut content analyses suggest that nematodes form major prey of soil microarthropods including those previously assumed to live as detritivores. Using molecular markers we traced nematode prey in fourteen abundant soil microarthropod taxa of Mesostigmata and Oribatida (both Acari) from three different microhabitats (litter, grass and moss). Consumption of nematodes varied between mite species indicating that trophic niche variation contributes to the high diversity of microarthropods in deciduous forests. Further, consumption of nematodes by Mesostigmata (but not Oribatida) differed between microhabitats indicating that trophic niches vary with habitat characteristics. Overall, the results suggest that free-living bacterial-feeding nematodes form important prey for soil microarthropods including those previously assumed to live as detritivores.

Keywords

Food web Predator–prey interaction Bacterial energy channel Grass Litter Moss 

Notes

Acknowledgments

This work was funded by the German Research Foundation (DFG; MA 2461/8) and performed at the Georg August University Göttingen. We thank Garvin Schulz and Diana Grubert for help with the field work and we thank Christel Fischer and Simone Cesarz for the identification of mesofauna- and nematode-species from the Macfayden samples. We also thank the reviewers for the constructive criticism.

Supplementary material

10493_2014_9807_MOESM1_ESM.xlsx (25 kb)
Supplementary material 1 (XLSX 25 kb)

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Kerstin Heidemann
    • 1
    Email author
  • Liliane Ruess
    • 2
  • Stefan Scheu
    • 1
  • Mark Maraun
    • 1
  1. 1.J.F. Blumenbach Institute of Zoology and AnthropologyGeorg August University GöttingenGöttingenGermany
  2. 2.Institute of BiologyHumboldt University BerlinBerlinGermany

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