Document


Title

Resilience of arctic mycorrhizal fungal communities after wildfire facilitated by resprouting shrubs
Document Type: Journal Article
Author(s): R. E. Hewitt; E. Bent; Teresa N. Hollingsworth; F. Stuart Chapin III; D. L. Taylor
Publication Year: 2013

Cataloging Information

Keyword(s):
  • arctic
  • arctic tundra
  • Betula nana
  • Betula nana
  • dwarf birch
  • fire intensity
  • fire management
  • fire regimes
  • forest management
  • fungal internal transcribed spacer (ITS) region
  • fungi
  • mycorrhiza
  • mycorrhizal community structure
  • nurse plant
  • post fire recovery
  • resprouting
  • shrubs
  • tundra
  • vascular plants
  • wildfires
Region(s):
Record Maintained By:
Record Last Modified: July 23, 2018
FRAMES Record Number: 52937
Tall Timbers Record Number: 30190
TTRS Location Status: Not in file
TTRS Call Number: Available
TTRS Abstract Status: Fair use, Okay, Reproduced by permission

This bibliographic record was either created or modified by the Tall Timbers Research Station and Land Conservancy and is provided without charge to promote research and education in Fire Ecology. The E.V. Komarek Fire Ecology Database is the intellectual property of the Tall Timbers Research Station and Land Conservancy.

Description

Climate-induced changes in the tundra fire regime are expected to alter shrub abundance and distribution across the Arctic. However, little is known about how fire may indirectly impact shrub performance by altering mycorrhizal symbionts. We used molecular tools, including ARISA and fungal ITS sequencing, to characterize the mycorrhizal communities on resprouting Betula nana shrubs across a fire-severity gradient after the largest tundra fire recorded in the Alaskan Arctic (July-October 2007). Fire effects on the components of fungal composition were dependant on the scale of taxonomic resolution. Variation in fungal community composition was correlated with fire severity. Fungal richness and relative abundance of dominant taxa declined with increased fire severity. Yet, in contrast to temperate and boreal regions with frequent wildfires, mycorrhizal fungi on resprouting shrubs in tundra were not strongly differentiated into fire-specialists and fire-sensitive fungi. Instead, dominant fungi, including taxa characteristic of late successional stages, were present regardless of fire severity. It is likely that the resprouting life history strategy of tundra shrubs confers resilience of dominant mycorrhizal fungi to fire disturbance by maintaining an inoculum source on the landscape after fire. Based on these results, we suggest that resprouting shrubs may facilitate post-fire vegetation regeneration and potentially the expansion of trees and shrubs under predicted scenarios of increased warming and fire disturbance in Arctic tundra. © 2014 Écoscience.

Citation:
Hewitt, R. E., E. Bent, T. N. Hollingsworth, F. S. Chapin, III, and D. L. Taylor. 2013. Resilience of arctic mycorrhizal fungal communities after wildfire facilitated by resprouting shrubs. Ecoscience, v. 20, no. 3, p. 296-310. 10.2980/20-3-3620.