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Climate, not Aboriginal landscape burning, controlled the historical demography and distribution of fire-sensitive conifer populations across Australia

Citation

Sakaguchi, S and Bowman, DMJS and Prior, LD and Crisp, MD and Linde, CC and Tsumura, Y and Isagi, Y, Climate, not Aboriginal landscape burning, controlled the historical demography and distribution of fire-sensitive conifer populations across Australia, Proceedings of the Royal Society B Biological Sciences, 280, (1773) Article 20132182. ISSN 0962-8452 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 The Royal Society

DOI: doi:10.1098/rspb.2013.2182

Abstract

Climate and fire are the key environmental factors that shape the distribution and demography of plant populations in Australia. Because of limited palaeoecological records in this arid continent, however, it is unclear as to which factor impacted vegetation more strongly, and what were the roles of fire regime changes owing to human activity and megafaunal extinction (since ca 50 kya). To address these questions, we analysed historical genetic, demographic and distributional changes in a widespread conifer species complex that paradoxically grows in fire-prone regions, yet is very sensitive to fire. Genetic demographic analysis showed that the arid populations experienced strong bottlenecks, consistent with range contractions during the Last Glacial Maximum (ca 20 kya) predicted by species distribution models. In southern temperate regions, the population sizes were estimated to have been mostly stable, followed by some expansion coinciding with climate amelioration at the end of the last glacial period. By contrast, in the flammable tropical savannahs, where fire risk is the highest, demographic analysis failed to detect significant population bottlenecks. Collectively, these results suggest that the impact of climate change overwhelmed any modifications to fire regimes by Aboriginal landscape burning and megafaunal extinction, a finding that probably also applies to other fire-prone vegetation across Australia.

Item Details

Item Type:Refereed Article
Keywords:aboriginal fire management, conifer, climate change, fire, phylogeography, population demography
Research Division:Biological Sciences
Research Group:Evolutionary Biology
Research Field:Biogeography and Phylogeography
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Ecosystem Adaptation to Climate Change
Author:Bowman, DMJS (Professor David Bowman)
Author:Prior, LD (Dr Lynda Prior)
ID Code:88577
Year Published:2013
Web of Science® Times Cited:15
Deposited By:Plant Science
Deposited On:2014-02-07
Last Modified:2017-11-01
Downloads:0

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