Exclusion of brown lemmings reduces vascular plant cover and biomass in Arctic coastal tundra: Resampling of a 50 + year herbivore exclosure experiment near Barrow, Alaska

D. R. Johnson, M. J. Lara, G. R. Shaver, G. O. Batzli, J. D. Shaw, C. E. Tweedie

Research output: Contribution to journalArticle

Abstract

To determine the role lemmings play in structuring plant communities and their contribution to the 'greening of the Arctic', we measured plant cover and biomass in 50 + year old lemming exclosures and control plots in the coastal tundra near Barrow, Alaska. The response of plant functional types to herbivore exclusion varied among land cover types. In general, the abundance of lichens and bryophytes increased with the exclusion of lemmings, whereas graminoids decreased, although the magnitude of these responses varied among land cover types. These results suggest that sustained lemming activity promotes a higher biomass of vascular plant functional types than would be expected without their presence and highlights the importance of considering herbivory when interpreting patterns of greening in the Arctic. In light of the rapid environmental change ongoing in the Arctic and the potential regional to global implications of this change, further exploration regarding the long-term influence of arvicoline rodents on ecosystem function (e.g.carbon and energy balance) should be considered a research priority.

Original languageEnglish (US)
Article number045507
JournalEnvironmental Research Letters
Volume6
Issue number4
DOIs
StatePublished - Dec 2011
Externally publishedYes

Keywords

  • Arctic plant communities
  • Arctic warming
  • climate change
  • herbivory
  • lemmings
  • tundra greening

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Environmental Science(all)
  • Public Health, Environmental and Occupational Health

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