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

TitleExclusion of brown lemmings reduces vascular plant cover and biomass in Arctic coastal tundra: resampling of a 50+ year herbivore exclosure experiment near Barrow, Alaska
Publication TypeJournal Article
Year of Publication2011
AuthorsJohnson D.R, Lara M.J, Shaver GR, Batzli G.O, Shaw J.D, Tweedie C.E
JournalEnvironmental Research LettersEnvironmental Research LettersEnvironmental Research Letters
Volume6
Date PublishedOct-Dec
ISBN Number1748-9326
Accession NumberISI:000298674700063
Keywordsarctic plant communities, arctic warming, climate change, community responses, ecosystems, environments, herbivory, lemmings, microtine rodents, multi-decadal changes, nutritional ecology, polar year-back, project ipy-btf, species richness, tundra greening, vegetation
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.

Short TitleEnviron Res LettEnviron Res Lett
Alternate JournalEnviron Res Lett