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Population collapse and retreat to fire refugia of the Tasmanian endemic conifer Athrotaxis selaginoides following the transition from Aboriginal to European fire management

Citation

Holz, A and Wood, SW and Ward, C and Veblen, TT and Bowman, DMJS, Population collapse and retreat to fire refugia of the Tasmanian endemic conifer Athrotaxis selaginoides following the transition from Aboriginal to European fire management, Global Change Biology, 26, (5) pp. 3108-3121. ISSN 1354-1013 (2020) [Refereed Article]

Copyright Statement

© 2020 John Wiley & Sons Ltd

DOI: doi:10.1111/gcb.15031

Abstract

Untangling the nuanced relationships between landscape, fire disturbance, human agency, and climate is key to understanding rapid population declines of fire‐sensitive plant species. Using multiple lines of evidence across temporal and spatial scales (vegetation survey, stand structure analysis, dendrochronology, and fire history reconstruction), we document landscape‐scale population collapse of the long‐lived, endemic Tasmanian conifer Athrotaxis selaginoides in remote montane catchments in southern Tasmania. We contextualized the findings of this field‐based study with a Tasmanian‐wide geospatial analysis of fire‐killed and unburned populations of the species. Population declines followed European colonization commencing in 1802 ad that disrupted Aboriginal landscape burning. Prior to European colonization, fire events were infrequent but frequency sharply increased afterwards. Dendrochronological analysis revealed that reconstructed fire years were associated with abnormally warm/dry conditions, with below‐average streamflow, and were strongly teleconnected to the Southern Annular Mode. The multiple fires that followed European colonization caused near total mortality of A. selaginoides and resulted in pronounced floristic, structural vegetation, and fuel load changes. Burned stands have very few regenerating A. selaginoides juveniles yet tree‐establishment reconstruction of fire‐killed adults exhibited persistent recruitment in the period prior to European colonization. Collectively, our findings indicate that this fire‐sensitive Gondwanan conifer was able to persist with burning by Aboriginal Tasmanians, despite episodic widespread forest fires. By contrast, European burning led to the restriction of A. selaginoides to prime topographic fire refugia. Increasingly, frequent fires caused by regional dry and warming trends and increased ignitions by humans and lightning are breaching fire refugia; hence, the survival Tasmanian Gondwanan species demands sustained and targeted fire management.

Item Details

Item Type:Refereed Article
Keywords:climate change, climate modes teleconnections, dendroecology, fire feedbacks, fire refugia, forest regeneration dynamics, human–fire interactions, forest, fire, Tasmania
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Forestry sciences
Research Field:Forestry fire management
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Terrestrial biodiversity
UTAS Author:Wood, SW (Mr Samuel Wood)
UTAS Author:Ward, C (Miss Carly Ward)
UTAS Author:Bowman, DMJS (Professor David Bowman)
ID Code:141120
Year Published:2020
Funding Support:Australian Research Council (DP110101950)
Web of Science® Times Cited:8
Deposited By:Plant Science
Deposited On:2020-09-26
Last Modified:2020-10-08
Downloads:0

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