Effect of landscape fires on the demography of the endangered New Caledonian conifer Callitris sulcata
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Date
2015-11-01
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
New Caledonia is a global biodiversity hotspot and an epicentre for Gondwanan conifers, many of which are
threatened by mining and by altered fire regimes. We studied the distribution, abundance and demography of
the endangered Callitris sulcata. The largest populations are restricted to one river system in the south-east of
the island, with satellite populations in adjoining rivers. The local distribution is controlled by the fire protection
afforded by terrain features such as scree slopes, creeklines and small cliffs. Adult trees, which have comparatively
thick bark, are able to tolerate and recover from infrequent surface fires, but severe fires kill trees and the seeds
they store, a pattern similar to that in many Australian Callitris species. Radiocarbon dating revealed the species
is slower growing than Australian Callitris species, possibly due to the extreme infertility of the ultramafic soils.
The species is of high cultural value to the indigenous population who also prizes the durable and aromatic timber,
and harvests have been traditionally regulated. Illegal cutting of trees has become a problem, but uncontrolled
fires, which have caused substantial population declines, dwarf this threat. Given these threats, conservation of
the species hinges on ensuring some populations remain remote and rarely visited by humans. © 2015, Elsevier Ltd.
Description
Keywords
Species diversity, Fires, Rivers, New Caledonia, Tree rings, Conifers
Citation
Haverkamp, C., Prior, L. D., Fogliani, B., L'Huillier, L., Anquez, M., Hua, Q., & Bowman, D. M. J. S. (2015). Effect of landscape fires on the demography of the endangered New Caledonian conifer Callitris sulcata. Biological Conservation, 191, 130-138. doi:10.1016/j.biocon.2015.06.012