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Banksia born to burn
Tianhua He1,2, Byron B Lamont1, Katherine S Downes1
1Centre for Ecosystem Diversity and Dynamics, Department of Environment and Agriculture, Curtin University, PO Box U1987, Perth, WA 6845, Australia.
The New Phytologist
|March 11, 2011
Summary
Fire influenced the evolution of Australian Banksia plants, with key fire-related traits like serotiny originating with the genus 60 million years ago. Later adaptations evolved with increasing fire frequency.
Area of Science:
- Evolutionary biology
- Paleobotany
- Ecology
Background:
- Recurrent fire is common in global biomes, suggesting evolutionary impacts on plant floras.
- The role of fire as a selective force in plant trait evolution is debated.
Purpose of the Study:
- To reconstruct the evolutionary history of fire-related traits in the Australian genus Banksia.
- To determine the timing of the origin and evolution of these traits in relation to Banksia's phylogeny and environmental changes.
Main Methods:
- Utilized Bayesian Monte-Carlo-Markov-Chain procedures for phylogenetic analysis.
- Incorporated calibration points from the fossil record to date the phylogeny.
- Reconstructed the evolutionary history of five putatively fire-related traits.
Main Results:
- Fire-dependent trait serotiny and fire-enhancing dead floret retention co-originated with Banksia ~60.8 million years ago (Palaeocene).
- Derived traits like dead leaf retention (fire-enhancing) and clonality (fire-avoiding) emerged 26-16 million years ago (Miocene).
- These traits evolved in response to increasing seasonal drought and fire frequency.
Conclusions:
- Fire may have been a selective force in the origin of Banksia, predating Miocene climate seasonality by 40 million years.
- Fire continued to shape Banksia's evolution, favoring adaptations to fluctuating fire regimes.
- Trait evolution in Banksia demonstrates adaptation to both fire-prone and fire-avoiding environments.
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