Can antibrowsing defense regulate the spread of woody vegetation in arctic tundra?

John P. Bryant, Kyle Joly, F. Stuart Chapin, Donald L. DeAngelis, Knut Kielland

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Global climate warming is projected to promote the increase of woody plants, especially shrubs, in arctic tundra. Many factors may affect the extent of this increase, including browsing by mammals. We hypothesize that across the Arctic the effect of browsing will vary because of regional variation in antibrowsing chemical defense. Using birch (Betula) as a case study, we propose that browsing is unlikely to retard birch expansion in the region extending eastward from the Lena River in central Siberia across Beringia and the continental tundra of central and eastern Canada where the more effectively defended resin birches predominate. Browsing is more likely to retard birch expansion in tundra west of the Lena to Fennoscandia, Iceland, Greenland and South Baffin Island where the less effectively defended non-resin birches predominate. Evidence from the literature supports this hypothesis. We further suggest that the effect of warming on the supply of plant-available nitrogen will not significantly change either this pan-Arctic pattern of variation in antibrowsing defense or the resultant effect that browsing has on birch expansion in tundra. However, within central and east Beringia warming-caused increases in plant-available nitrogen combined with wildfire could initiate amplifying feedback loops that could accelerate shrubification of tundra by the more effectively defended resin birches. This accelerated shrubification of tundra by resin birch, if extensive, could reduce the food supply of caribou causing population declines. We conclude with a brief discussion of modeling methods that show promise in projecting invasion of tundra by woody plants.

Original languageEnglish
Pages (from-to)204-211
Number of pages8
JournalEcography
Volume37
Issue number3
DOIs
StatePublished - Mar 1 2014

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tundra
Betula
browsing
vegetation
resins
Beringia
resin
warming
woody plant
woody plants
Arctic region
Rangifer tarandus
chemical defense
nitrogen
Iceland
Siberia
Scandinavia
Greenland
population decline
wildfires

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

Cite this

Bryant, J. P., Joly, K., Chapin, F. S., DeAngelis, D. L., & Kielland, K. (2014). Can antibrowsing defense regulate the spread of woody vegetation in arctic tundra? Ecography, 37(3), 204-211. https://doi.org/10.1111/j.1600-0587.2013.00436.x

Can antibrowsing defense regulate the spread of woody vegetation in arctic tundra? / Bryant, John P.; Joly, Kyle; Chapin, F. Stuart; DeAngelis, Donald L.; Kielland, Knut.

In: Ecography, Vol. 37, No. 3, 01.03.2014, p. 204-211.

Research output: Contribution to journalArticle

Bryant, JP, Joly, K, Chapin, FS, DeAngelis, DL & Kielland, K 2014, 'Can antibrowsing defense regulate the spread of woody vegetation in arctic tundra?', Ecography, vol. 37, no. 3, pp. 204-211. https://doi.org/10.1111/j.1600-0587.2013.00436.x
Bryant, John P. ; Joly, Kyle ; Chapin, F. Stuart ; DeAngelis, Donald L. ; Kielland, Knut. / Can antibrowsing defense regulate the spread of woody vegetation in arctic tundra?. In: Ecography. 2014 ; Vol. 37, No. 3. pp. 204-211.
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