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Experimental evidence that fire causes a tree recruitment bottleneck in an Australian tropical savanna

Prior, Lynda D., Williams, Richard J. and Bowman, David M. J. S. (2010). Experimental evidence that fire causes a tree recruitment bottleneck in an Australian tropical savanna. Journal of Tropical Ecology,26(6):595-603.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 21 times in Scopus Article | Citations

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IRMA ID 81704288xPUB285
Title Experimental evidence that fire causes a tree recruitment bottleneck in an Australian tropical savanna
Author Prior, Lynda D.
Williams, Richard J.
Bowman, David M. J. S.
Journal Name Journal of Tropical Ecology
Publication Date 2010
Volume Number 26
Issue Number 6
ISSN 0266-4674   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-79251615382
Start Page 595
End Page 603
Total Pages 9
Place of Publication United Kingdom
Publisher Cambridge University Press
HERDC Category C1 - Journal Article (DIISR)
Abstract A fire-mediated recruitment bottleneck provides a possible explanation for the coexistence of trees and grasses in mesic savannas. The key element of this hypothesis is that saplings are particularly vulnerable to fire because they are small enough to be top-killed by grass fires, but unlike juveniles, they take several years to recover their original size. This limits the number of recruits into the adult size classes. Thus savanna vegetation may be maintained by a feedback whereby fire restricts the density of adult trees and allows a grass layer to develop, which provides fuel for subsequent fires. Here, we use results from a landscape-scale fire experiment in tropical Australia, to explore the possible existence of a recruitment bottleneck. This experiment compared tree recruitment and survival over 4 y under regimes of no fire, annual early and annual late dry-season fire. Stem mortality decreased with increasing stem height in the fire treatments but not in the unburnt treatment. Tree recruitment was 76–84% lower in the fire treatments than the unburnt treatment. Such fire-induced stem loss of saplings and reduced recruitment to the canopy layer in this eucalypt savanna are consistent with the predictions of the fire-mediated recruitment bottleneck hypothesis.
Keywords Eucalyptus
fire ecology
Kakadu National Park
monsoonal tropics
stand dynamics
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