University Of Tasmania
125732 - Demographic vulnerability of an extreme xerophyte in arid Australia - OA version.pdf (2.09 MB)
Download file

Demographic vulnerability of an extreme xerophyte in arid Australia

Download (2.09 MB)
journal contribution
posted on 2023-05-19, 17:46 authored by Lynda PriorLynda Prior, Hua, Q, David BowmanDavid Bowman
Callitris glaucophylla (syn. C. columellaris F.Muell.) is an iconic Australian conifer that is suffering a recruitment deficit over much of the arid zone. Here, seedling establishment requires a series of unusually wet years, and protection from high levels of herbivory. The aim of our study was to determine the size class structure of C. glaucophylla populations in the most arid part (150 mm mean annual precipitation) of its range, and particularly whether seedlings had established during a wet period in 2010/11. We sampled C. glaucophylla populations throughout the region, including inside a 6000 ha feral animal exclosure. We found no seedlings from 2010/11, except on drainage lines adjacent to roads. Of 255 plots centred on mature trees, only 2% contained older seedlings, and 8% contained saplings, with no differences inside or outside exclosure, and 84% of trees were larger than 20 cm basal diameter. Matching dates of known regeneration with long-term rainfall records suggested that successful regeneration of C. glaucophylla requires a total of 600–720 mm of rain over a 2 year period. Our radiocarbon dating showed the age of three large trees ranged from 106 to 268 years, signifying that such trees in this region likely have only 2–8 climatic opportunities to reproduce.


Australian Institute of Nuclear Science & Engineering


Publication title

Australian Journal of Botany








School of Natural Sciences


C S I R O Publishing

Place of publication

150 Oxford St, Po Box 1139, Collingwood, Australia, Victoria, 3066

Rights statement

Journal compilation copyright CSIRO 2018

Repository Status

  • Open

Socio-economic Objectives

Terrestrial biodiversity

Usage metrics

    University Of Tasmania