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COSEWIC Assessment and Update Status Report on the Cerulean Warbler in Canada

Existing Protection or Other Status

The Cerulean Warbler is not federally listed in the United States (Hamel 2000b) and is considered a Species of Special Concern in Canada (COSEWIC 2000). The Migratory Bird Treaty Act of 1918 provides protection against direct take. NatureServe gives the Cerulean Warbler a global rank of G4 (i.e., common and secure).

In Canada, the Cerulean Warbler is considered Vulnerable in Ontario (by the Ontario Ministry of Natural Resources). It appears on the list of species susceptible to be designated at risk in Quebec (Société de la Faune et des Parcs du Québec). It is ranked by NatureServe as S3B (very rare or otherwise vulnerable) in Ontario and S1B (critically imperiled) in Quebec and N3B nationally. 

In the US, as of 2000 (Hamel 2000b), the Cerulean Warbler was on Watch Lists in three states (Illinois, Maryland, Missouri), listed as Threatened in 2 states (Rhode Island, Wisconsin), of Special Concern or Interest in 8 states (Indiana, Kansas, Louisiana, Michigan, Minnesota, New York, Ohio, Vermont) and as Significantly Rare in 1 state (North Carolina). NatureServe ranks the Cerulean Warbler in all states where it occurs (Table 1) and gives the species a rank of N4B (widespread) for the US as a whole.

Table 1: NatureServe Ranks for the Cerulean Warbler in the United States
StateState Rank a (season)
ArizonaA (non-breeding)
Delaware1 (breeding)
Iowa2 (breeding)
Kansas1 (breeding)
Louisiana1 (breeding)
Maryland3 (breeding)
MississippiZ (non-breeding)
North Carolina3 (breeding)
Z (non-breeding)
New Hampshire1 (breeding)
New Jersey3
New Mexico1 (non-breeding)
New York4 (breeding)
Oklahoma2 (breeding)
Pennsylvania4 (breeding)
Rhode Island1 (breeding)
2 (non-breeding)
South Dakota1 (breeding)
Texas3 (breeding)
Vermont1 (breeding)
Z (non-breeding)
Wisconsin2 (breeding)
Z (non-breeding)
West Virginia4 (breeding)

Taken from Hamel 2000b and updated (S. G. Cannings pers. comm.).

1 - critically imperiled within the geographic area (< 5 occurrences),
2 - imperiled within the geographic area (6-20 occurrences),
3 - either very rare and local or found only in restricted range within the geographic area (21-100 occurrences),
4 - widespread, abundant and apparently secure within the geographic area (>100 occurrences),
5 - demonstrably widespread, abundant and secure within the geographic area,
A - accidental,
Z - of regular temporal occurrence within the geographic area, but not at a specific site.