University Of Tasmania

File(s) under permanent embargo

Abrupt fire regime change may cause landscape-wide loss of mature obligate seeder forests

journal contribution
posted on 2023-05-17, 19:57 authored by David BowmanDavid Bowman, Murphy, BP, Neyland, DLJ, Grant WilliamsonGrant Williamson, Lynda PriorLynda Prior
Obligate seeder trees requiring high-severity fires to regenerate may be vulnerable to population collapse if fire frequency increases abruptly. We tested this proposition using a long-lived obligate seeding forest tree, alpine ash (Eucalyptus delegatensis), in the Australian Alps. Since 2002, 85% of the Alps bioregion has been burnt by several very large fires, tracking the regional trend of more frequent extreme fire weather. High-severity fires removed 25% of above ground tree biomass, and switched fuel arrays from low loads of herbaceous and litter fuels to high loads of flammable shrubs and juvenile trees, priming regenerating stands for subsequent fires. Single high-severity fires caused adult mortality and triggered mass regeneration, but a second fire in quick succession killed 97% of the regenerating alpine ash. Our results indicate that without interventions to reduce fire severity, interactions between flammability of regenerating stands and increased extreme fire weather will eliminate much of the remaining mature alpine ash forest.


Publication title

Global Change Biology








School of Natural Sciences


Blackwell Publishing Ltd

Place of publication

Oxford, UK

Rights statement

Copyright 2013 Wiley

Repository Status

  • Restricted

Socio-economic Objectives

Ecosystem adaptation to climate change