Adding fuel to the fire: the impacts of non-native grass invasion on fire management at a regional scale

Samantha A. Setterfield, Natalie A. Rossiter-Rachor, Michael M. Douglas, Lisa Wainger, Aaron M. Petty, Piers Barrow, Ian J. Shepherd, Keith B. Ferdinands

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Background:Widespread invasion by non-native plants has resulted in substantial change in fire-fuel characteristics and fire-behaviour in many of the world's ecosystems, with a subsequent increase in the risk of fire damage to human life, property and the environment. Models used by fire management agencies to assess fire risk are dependent on accurate assessments of fuel characteristics but there is little evidence that they have been modified to reflect landscape-scale invasions. There is also a paucity of information documenting other changes in fire management activities that have occurred to mitigate changed fire regimes. This represents an important limitation in information for both fire and weed risk management.Methodology/Principal Findings:We undertook an aerial survey to estimate changes to landscape fuel loads in northern Australia resulting from invasion by Andropogon gayanus (gamba grass). Fuel load within the most densely invaded area had increased from 6 to 10 t ha-1 in the past two decades. Assessment of the effect of calculating the Grassland Fire Danger Index (GFDI) for the 2008 and 2009 fire seasons demonstrated that an increase from 6 to 10 t ha-1 resulted in an increase from five to 38 days with fire risk in the 'severe' category in 2008 and from 11 to 67 days in 2009. The season of severe fire weather increased by six weeks. Our assessment of the effect of increased fuel load on fire management practices showed that fire management costs in the region have increased markedly (∼9 times) in the past decade due primarily to A. gayanus invasion.Conclusions/Significance:This study demonstrated the high economic cost of mitigating fire impacts of an invasive grass. This study demonstrates the need to quantify direct and indirect invasion costs to assess the risk of further invasion and to appropriately fund fire and weed management strategies.

Original languageEnglish
Article numbere59144
JournalPLoS One
Volume8
Issue number5
DOIs
Publication statusPublished - 14 May 2013
Externally publishedYes

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fuels (fire ecology)
Poaceae
Fires
grasses
Andropogon gayanus
grassland fires
fire weather
fire season
Costs and Cost Analysis
fire hazard
fire behavior
economic costs
Andropogon
fire regime
risk management
Costs
weed control
Practice Management
weeds
Weather

Cite this

Setterfield, Samantha A. ; Rossiter-Rachor, Natalie A. ; Douglas, Michael M. ; Wainger, Lisa ; Petty, Aaron M. ; Barrow, Piers ; Shepherd, Ian J. ; Ferdinands, Keith B. / Adding fuel to the fire : the impacts of non-native grass invasion on fire management at a regional scale. In: PLoS One. 2013 ; Vol. 8, No. 5.
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Adding fuel to the fire : the impacts of non-native grass invasion on fire management at a regional scale. / Setterfield, Samantha A.; Rossiter-Rachor, Natalie A.; Douglas, Michael M.; Wainger, Lisa; Petty, Aaron M.; Barrow, Piers; Shepherd, Ian J.; Ferdinands, Keith B.

In: PLoS One, Vol. 8, No. 5, e59144, 14.05.2013.

Research output: Contribution to journalArticle

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