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Evidence for the equal resilience of Triodia spp. (Poaceae), from different functional groups, to frequent fire dating back to the late Pleistocene

Armstrong, G. (2011). Evidence for the equal resilience of Triodia spp. (Poaceae), from different functional groups, to frequent fire dating back to the late Pleistocene. Heredity,107(6):558-564.

Document type: Journal Article
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IRMA ID 82057923xPUB27
Title Evidence for the equal resilience of Triodia spp. (Poaceae), from different functional groups, to frequent fire dating back to the late Pleistocene
Author Armstrong, G.
Journal Name Heredity
Publication Date 2011
Volume Number 107
Issue Number 6
ISSN 0018-067X   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-81355149845
Start Page 558
End Page 564
Total Pages 7
Place of Publication United Kingdom
Publisher Nature Publishing Group
HERDC Category C1 - Journal Article (DIISR)
Abstract Species with different regenerative responses to fire are hypothesised to coexist by utilising the different temporal and spatial niche opportunities created by the stochasticity of the fire regime. This is strongly supported by observations of instability of species' presence and abundance at the local scale while these are stable at the community scale. However, observations of species coexistence in fire-prone communities are limited to several decades only. To improve the robustness of this hypothesis, coalescent analysis, using chloroplast microsatellites, was undertaken on three sympatric species of Triodia from different functional groups in the fire-prone Kimberley region of Western Australia. The results inferred that T. bitextura, an obligate resprouter, Triodia sp., an obligate seeder, and T. epactia, a facultative resprouter, had mean T mrca values of 65k, 40k and 111k generations, respectively. Using a mutation rate of 3.2 × 10 5 and a generation time of 5 years gave T mrca values of 436k, 203k and 556 k years, respectively. These results provide evidence for the coexistence of these species to the same fire regime dating back to the late Pleistocene. It also demonstrates the long-term resilience of an obligate seeder, Triodia sp., in a frequently burnt environment at the community scale.
Keywords coexistence
facultative resprouter
fire
obligate resprouter
obligate seeder
Pleistocene
DOI http://dx.doi.org/10.1038/hdy.2011.42   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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