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Growth and survival of two north Australian relictual tree species, Allosyncarpia ternata (Myrtaceae) and Callitris intratropica (Cupressaceae)

Citation

Prior, LD and Bowman, DMJS and Brook, BW, Growth and survival of two north Australian relictual tree species, Allosyncarpia ternata (Myrtaceae) and Callitris intratropica (Cupressaceae), Ecological Research, 22, (2) pp. 228-236. ISSN 0912-3814 (2007) [Refereed Article]


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Copyright Statement

Copyright The Ecological Society of Japan 2006 The final publication is available at http://www.springerlink.com

DOI: doi:10.1007/s11284-006-0011-2

Abstract

Allosyncarpia ternata (an angiosperm) and Callitris intratropica (a gymnosperm) are two fire-sensitive tree species of the Australian monsoonal tropics. Studies using historical aerial photography have revealed recent expansion of A. ternata rainforests. There has simultaneously been a widespread collapse of C. intratropica populations in northern Australian savannas, presumably because of cessation of traditional Aboriginal landscape burning. To explain the demography behind these contrasting trends, stand structure, survival, and growth of the two species were recorded over a 16-year period at the boundary of a rainforest patch and also in adjacent savanna, in Kakadu National Park. Ages of the largest trees of each species, estimated by using a Bayesian analysis of tree-diameter increments, were approximately 433 years for A. ternata and 235 years for C. intratropica on the rainforest boundary, and 417 years for C. intratropica in the adjacent savanna. Densities of juveniles (seedlings and re-sprouts <0.5 m high) were 3256,000 times higher for A. ternata than for C. intratropica. Life-table calculations indicated there was sufficient recruitment of A. ternata, but not C. intratropica, to overcome observed mortality rates and maintain a stable population. This is almost certainly because A. ternata re-sprouts prolifically after fire whereas C. intratropica is an obligate seeder. These results highlight the critical need for careful fire management to maintain populations of a characteristic Australian gymnosperm over much of its range.

Item Details

Item Type:Refereed Article
Keywords:Survival - Recruitment - Seasonal tropics - Growth rate - Tropical tree
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Population Ecology
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Forest and Woodlands Flora, Fauna and Biodiversity
Author:Prior, LD (Dr Lynda Prior)
Author:Bowman, DMJS (Professor David Bowman)
ID Code:50671
Year Published:2007
Web of Science® Times Cited:32
Deposited By:Plant Science
Deposited On:2007-08-01
Last Modified:2011-09-29
Downloads:0

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