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Lemming-Food Plant Interactions, Density Effects, and Cyclic Dynamics on the Siberian Tundra

  • Sam Erlinge
  • Dennis Hasselquist
  • Goran Hogstedt
  • Tarald Seldal
  • Peter Frodin
  • Mikael Svensson
Publishing year: 2011
Language: English
Pages: 421-428
Publication/Series: Arctic
Volume: 64
Issue: 4
Document type: Journal article
Publisher: The Arctic Institute of North America

Abstract english

Theory predicts that trophic interactions can produce cyclic dynamics of microtine rodents, but that in addition, social interactions are necessary to create the cyclicity. We tested the induced defence hypothesis as a component driving multiannual cycles by analyzing data on Siberian lemming (Lemmus sibiricus Kerr) populations and the levels of trypsin inhibitors (TI) and free proteins (SPP) in their food plants. We collected data at 12 sites along the Palaearctic tundra coast in 1994 and correlated these measures with lemming density and cycle phase. A negative correlation between lemming density and TI/SPP in Carex was found at the 12 sites. Cycle phase tended to correlate significantly with TI/SPP, and plants being grazed by lemmings respond with some delay. Mass of pancreas, the organ producing proteolytic enzymes, co-varied negatively with TI/SPP. These findings are in accord with predictions from the induced defence hypothesis. En contrast, reproductive effort did not conform to the predictions but co-varied strongly with density. Data are in accord with theory predicting that, in addition to trophic interactions, some self-regulation is necessary to create cyclic dynamics. Our data show that the plant defence hypothesis alone is not a sufficient explanation for the cyclicity. Several factors interact, including predation, food quality (including induced defence chemicals), and intra-specific competition.


  • Biological Sciences
  • lemming
  • cyclic dynamics
  • lemming-food plant interactions
  • density
  • effect
  • Siberian tundra


  • Molecular Ecology and Evolution Lab
  • ISSN: 0004-0843
Dennis Hasselquist
E-mail: dennis [dot] hasselquist [at] biol [dot] lu [dot] se



+46 46 222 37 08



Research group


Doctoral students and postdocs

Research fellows


Jacob Roved

PhD Students, main supervisor

PhD Students, assistant supervisor


Interview about my research in the Swedish podcast "Forskarn & jag"