Fire severity and fire-induced landscape heterogeneity affect arboreal mammals in fire-prone forests

In fire-prone regions, wildfire influences spatial and temporal patterns of landscape heterogeneity. The likely impacts of climate change on the frequency and intensity of wildfire highlights the importance of understanding how fire-induced heterogeneity may affect different components of the biota....

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Bibliographic Details
Published in:Ecosphere (Washington, D.C) D.C), 2015-10, Vol.6 (10), p.art190-14
Main Authors: Chia, Evelyn K, Bassett, Michelle, Nimmo, Dale G, Leonard, Steve W. J, Ritchie, Euan G, Clarke, Michael F, Bennett, Andrew F
Format: Article
Language:English
Subjects:
biodiversity
Biota
climate
Climate change
dispersal
Ecosystems
Environmental impact
Forest & brush fires
Forest fires
Forests
Gullies
Heterogeneity
Influence
Landscape
Mammals
marsupial
metapopulation
Recolonization
refuge
Studies
Topography
Vegetation
wildfire
Wildfires
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Summary:In fire-prone regions, wildfire influences spatial and temporal patterns of landscape heterogeneity. The likely impacts of climate change on the frequency and intensity of wildfire highlights the importance of understanding how fire-induced heterogeneity may affect different components of the biota. Here, we examine the influence of wildfire, as an agent of landscape heterogeneity, on the distribution of arboreal mammals in fire-prone forests in south-eastern Australia. First, we used a stratified design to examine the role of topography, and the relative influence of fire severity and fire history, on the occurrence of arboreal mammals 2-3 years after wildfire. Second, we investigated the influence of landscape context on the occurrence of arboreal mammals at severely burnt sites. Forested gullies supported a higher abundance of arboreal mammals than slopes. Fire severity was the strongest influence, with abundance lower at severely burnt than unburnt sites. The occurrence of mammals at severely burned sites was influenced by landscape context: abundance increased with increasing amount of unburnt and understorey-only burnt forest within a 1 km radius. These results support the hypothesis that unburnt forest and moist gullies can serve as refuges for fauna in the post-fire environment and assist recolonization of severely burned forest. They highlight the importance of spatial heterogeneity created by wildfire and the need to incorporate spatial aspects of fire regimes (e.g., creation and protection of refuges) for fire management in fire-prone landscapes.
ISSN:2150-8925
2150-8925
DOI:10.1890/ES15-00327.1