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Research ArticleUnderstanding fine-scale fire patchinesshas significant implications forecological processes and biodiversityconservation. It can affect localextinction of and recolonisation byrelatively immobile fauna and poorlyseed-dispersed flora in fire-affectedareas. This study assesses fine-scale firepatchiness and severity, and associatedimplications for biodiversity, in northAustralian tropical savanna systems.We used line transects to sampleburning patterns of ground layervegetation in different seasons andvegetation structure types, within theperimeter of 35 fires that occurredbetween 2009 and 2011. We evaluatedtwo main fire characteristics: patchiness(patch density and mean patch length)and severity (inferred from char andscorch heights, and char and ashproportions). The mean burned area of ground vegetation was 83 % in theearly dry season (EDS: May to July)and 93 % in the late dry season (LDS:August to November). LDS fires wereless patchy (smaller and fewerunburned patches), and had higher fireseverity (higher mean char and scorchheights, and twice the proportion ofash) than EDS fires. Fire patchinessvaried among vegetation types,declining under more open canopystructure. The relationship betweenburned area and fire severity dependedon season, being strongly correlated inthe EDS and uncorrelated in the LDS.Simulations performed to understandthe implications of patchiness on thepopulation dynamics of fire-intervalsensitive plant species showed thatsmall amounts of patchinesssubstantially enhance survival. Ourresults indicate that the ecologicalimpacts of high frequency fires on firesensitiveregional biodiversityelements are likely to be lower thanhas been predicted from remotelysensed studies that are based onassumptions of homogeneous burninginfo:eu-repo/semantics/publishedVersio

Ecological Implications of Fine-Scale Fire Patchiness and Severity in Tropical Savannas of Northern Australia