West End of Lake Ontario

IBA Criteria

Year of most recent IBA criteria assessment: 2008

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Long-tailed Duck Clangula hyemalis VU passage 1994 30,000 individuals A4i
White-winged Scoter Melanitta deglandi LC passage 1995 11,100 individuals A4i
Greater Scaup Aythya marila LC passage 1995 10,000 individuals A4i
A4iii Species group - waterbirds n/a passage 1994 20,000-49,999 individuals A4iii

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


IUCN Habitat Habitat detail Extent (% of site)
Wetlands (inland) Freshwater lakes and pools -
For further information about the habitat classification please click here.

Land use

Land-use Extent (% of site)
tourism/recreation -
urban/industrial/transport -
water management -
For further information about the land use classification please click here.

Recommended citation
BirdLife International (2022) Important Bird Areas factsheet: West End of Lake Ontario. Downloaded from on 25/06/2022.