LC
Rufous Bristlebird Dasyornis broadbenti



Justification

Justification of Red List Category
Although this species may have a restricted range, it is not believed to approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.

Population justification
The population is estimated to number 4,000-28,000 individuals, roughly equating to 2,700-19,000 mature individuals.

Trend justification
This population is suspected to be in decline owing to habitat loss and degradation, disturbance, fires and drought (del Hoyo et al. 2007).

Distribution and population

This taxon is endemic to Australia. Nominate broadbenti occurs in near-coastal environments from Port Fairy, Victoria, to the mouth of the Murray River, South Australia. Subspecies caryochrous was thought to be largely confined to the coast between Peterborough and Point Addis east of Anglesea, Western Victoria, but is now known to occur extensively within the Otway Range. Subspecies litoralis, endemic to Western Australia, is extinct, probably as a result of fire, and was last seen in 1940 (Glauert 1944).

Ecology

The species occurs in scrub, heathland and forest.

Threats

Historically, the range of the species has declined as a result of clearance for agriculture; habitat fragmentation has already resulted in the isolation of some subpopulations of broadbenti. On top of this, grazing by rabbits and modification by exotic weeds could have long-term effects for broadbenti, and concern has been expressed about its rates of infertility. Coastal urban development has also destroyed habitat, and is the greatest threat facing caryochrous, which, given its essentially linear distribution, is particularly vulnerable to fragmentation. For caryochrous, effects of fragmentation are likely to be exacerbated by periodic wildfire from which the habitat takes at least six years to become suitable again. The species may also be vulnerable to cat and fox predation (Garnett and Crowley 2000, Seymour et al. 2003).

Acknowledgements

Text account compilers
Benstead, P., Butchart, S., Ekstrom, J., Fisher, S., Harding, M., Khwaja, N.


Recommended citation
BirdLife International (2022) Species factsheet: Dasyornis broadbenti. Downloaded from http://www.birdlife.org on 27/01/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 27/01/2022.