International Journal of Wildland Fire International Journal of Wildland Fire Society
Journal of the International Association of Wildland Fire
RESEARCH ARTICLE

Big fires and their ecological impacts in Australian savannas: size and frequency matters

Cameron P. Yates A B C , Andrew C. Edwards A B and Jeremy Russell-Smith A B
+ Author Affliations
- Author Affliations

A Bushfires NT, PO Box 37346, Winnellie, NT 0821, Australia.

B Tropical Savannas Cooperative Research Centre, Charles Darwin University, Building 31, Level 3, Darwin, NT 0909, Australia.

C Corresponding author. Email: cameron.yates@nt.gov.au

International Journal of Wildland Fire 17(6) 768-781 https://doi.org/10.1071/WF07150
Submitted: 15 October 2007  Accepted: 13 May 2008   Published: 12 December 2008

Abstract

Savannas are the most fire-prone of the earth’s major biomes. The availability of various broad-scale satellite-derived fire mapping and regional datasets provides a framework with which to examine the seasonality, extent and implications of large fires with particular reference to biodiversity values in the tropical savannas of northern Australia. We document the significance of savanna fires in the fire-prone ‘Top End’ region of the Northern Territory, Australia, using 9 years (1997–2005) of National Oceanic and Atmospheric Administration (NOAA)-Advanced Very High Resolution Radiometer (AVHRR)-, Landsat Thematic Mapper (TM)- and Enhanced Thematic Mapper (ETM+)-derived fire mapping. Fire (patch) sizes from both AVHRR- and Landsat-scale mapping increased through the calendar year associated with progressive curing of grass and litter fuels. Fire frequency data at both satellite sensor scales indicate that regional fire regimes in higher rainfall regions are dominated by large (>1000 km2) fires occurring typically at short (~2–3 years) fire return intervals. In discussion, we consider the ecological implications of these patch size distributions on regional fire-sensitive biota. Collectively, assembled data illustrate that many northern Australian savanna flora, fauna and habitats embedded within the savanna matrix are vulnerable to extensive and frequent fires, especially longer-lived obligate seeder plant taxa and relatively immobile vertebrate fauna with small home ranges.

Additional keywords: Arnhem Land, AVHRR, fire-affected area, Landsat, patch size, Top End.


Acknowledgements

The discussion presented here draws heavily on the published work of colleagues, particularly that of John Woinarski and fellow fauna ecologists. While we do not presume that John and others subscribe fully to our interpretations, we acknowledge with thanks the years of patient assembling of those data.


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