LC
Glossy Black-cockatoo Calyptorhynchus lathami



Justification

Justification of Red List Category
This species has a very large range, and hence does not 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 may be moderately small to large, 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
Garnett and Crowley (2000) estimated the population size as follows: 12,000 individuals of subspecies lathami, 70 breeding pairs of subspecies halmaturinus (equating to 140 individuals) and 5,000 individuals of subspecies erebus giving an overall total of 17,140 individuals.

Trend justification
The population is suspected to be declining overall as the largest subpopulation, lathami, is declining slowly throughout its range. However sub species erebus is thought to be increasing and subspecies halmaturinus is increasing as a result of conservation efforts on Kangaroo island (Garnett and Crowley 2000).

Distribution and population

This species is found in Queensland, New South Wales and Victoria, Australia. Subspecies erebus is found in east-central Queensland; subspecies lathami has a patchy distribution in Queensland, Victoria, and King Island, Bass Strait; subspecies halmaturinus is now restricted to Kangaroo Island.

Threats

Most habitat clearance occurred in the 19th century, although, on the mainland, the species remains threatened by clearance of habitat for agriculture and residential development, degradation of habitat by burning, and the suppression of vegetation regeneration by grazing stock and rabbits. Fragmentation of habitat, especially when associated with agriculture, leads to the penetration of other native species from more open habitats which then compete for hollows. Illegal trapping for the bird trade may be a localised problem. However, in some parts of its range the area of mature food trees may be increasing (Garnett and Crowley 2000).

Acknowledgements

Text account compilers
Ekstrom, J., Butchart, S., Harding, M.


Recommended citation
BirdLife International (2019) Species factsheet: Calyptorhynchus lathami. Downloaded from http://www.birdlife.org on 22/11/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 22/11/2019.