Werribee and Avalon

IBA Criteria

Year of most recent IBA criteria assessment: 2009

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Blue-billed Duck Oxyura australis LC resident 2001-2007 1,784-13,000 individuals A1, A4i
Musk Duck Biziura lobata LC resident 2001-2007 1,436-2,103 individuals A4i
Pink-eared Duck Malacorhynchus membranaceus LC resident 2001-2007 17,028-50,985 individuals A4i
Freckled Duck Stictonetta naevosa LC resident 2001-2007 57-595 individuals A4i
Australian Shelduck Tadorna tadornoides LC resident 2001-2007 3,081-18,230 individuals A4i
Australasian Shoveler Spatula rhynchotis LC resident 2001-2007 6,608-17,433 individuals A4i
Chestnut Teal Anas castanea LC resident 2001-2007 5,799-10,064 individuals A4i
Hoary-headed Grebe Poliocephalus poliocephalus LC resident 2001-2007 14,055-24,881 individuals A4i
Sharp-tailed Sandpiper Calidris acuminata VU non-breeding 1981-2007 586-4,060 individuals A4i
Red-necked Stint Calidris ruficollis NT non-breeding 1981-2007 5,603-15,110 individuals A4i
Orange-bellied Parrot Neophema chrysogaster CR non-breeding 1978-2007 20 individuals A1

Note: This table presents the IBA criteria triggered and the species that triggered then at the time of assessment, the current IUCN Red List category may vary from that which was in place at that time.

For more information about the IBA assessment process and criteria please click here

IBA Monitoring

Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2008 medium not assessed not assessed
Was the whole site covered? Yes State assessed by unset
Accuracy of information good

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Climate change and severe weather storms and floods likely in long term (beyond 4 years) small area/few individuals (<10%) slow but significant deterioration low
Human intrusions and disturbance recreational activities happening now some of area/population (10-49%) no or imperceptible deterioration low
Invasive and other problematic species and genes invasive non-native/alien species/diseases - named species happening now some of area/population (10-49%) slow but significant deterioration medium
Natural system modifications other ecosystem modifications happening now some of area/population (10-49%) slow but significant deterioration medium
Pollution domestic & urban waste water - type unknown/unrecorded happening now some of area/population (10-49%) slow but significant deterioration medium
Pollution industrial & military effluents - oil spills likely in short term (within 4 years) some of area/population (10-49%) slow but significant deterioration medium

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Not assessed Not assessed Not assessed not assessed
For more information about IBA monitoring please click here

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
The Spit W.R. Nature Conservation Reserve 678 protected area overlaps with site 431
Port Phillip Bay (Western Shoreline) and Bellarine Peninsula Ramsar Site, Wetland of International Importance 22,646 protected area overlaps with site 0


IUCN Habitat Habitat detail Extent (% of site)
Artificial/Aquatic & Marine Other artificial wetlands -
Coastline Intertidal mud, sand & salt flats, Salt marshes -
Wetlands (inland) Freshwater lakes & pools -
Marine Intertidal -
For further information about the habitat classification please click here.

Land use

Land-use Extent (% of site)
nature conservation and research -
not utilised -
urban/industrial/transport -
military -
For further information about the land use classification please click here.

Land ownership
A mix of State and private ownership - Melbourne Water is responsible for Sewage Treatment areas; Victorian Parks for reserves, intertidal areas and Bay waters; Cheetham Salt Company owns the salt works.

Recommended citation
BirdLife International (2023) Important Bird Areas factsheet: Werribee and Avalon. Downloaded from http://www.birdlife.org on 09/02/2023.