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

Technical Summary

Dendroica cerulean

Cerulean Warbler
Paruline azurée

Ontario, Quebec


Extent and Area Information

extent of occurrence (EO)(km2)
About 85 000 km2

specify trend (decline, stable, increasing, unknown)

Stable


are there extreme fluctuations in
EO (> 1 order of magnitude)?

No


area of occupancy (AO) (km2)

Less than 100 km2. Based on number of pairs multiplied by a liberal estimate of average territory size of 2 ha.

specify trend (decline, stable, increasing, unknown)

Possibly decreasing


are there extreme fluctuations in
AO (> 1 order magnitude)?

No


number of extant locations

More than 100. A location is defined as a woodlot or occupied sector of larger forest stands

specify trend in # locations (decline, stable, increasing, unknown)

Possibly decreasing


are there extreme fluctuations in # locations (>1 order of magnitude)?

No


habitat trend: specify declining, stable, increasing or unknown trend in area, extent or quality of habitat

Probably increasing



Population Information

generation time (average age of parents in the population) (indicate years, months, days, etc.)
2 - 3 years



number of breeding pairs in the Canadian population (or, specify a range of plausible values)

500 - 1000



total population trend: specify declining, stable, increasing or unknown trend in number of mature individuals

Unknown



if decline, % decline over the last/next 10 years or 3 generations, whichever is greater (or specify if for shorter time period)

n.a.




are there extreme fluctuations in number of mature individuals (> 1 order of magnitude)?

No



is the total population severely fragmented (most individuals found within small and relatively isolated (geographically or otherwise) populations between which there is little exchange, i.e., ≤ 1 successful migrant / year)?

No







list each population and the number of mature individuals in each

n.a.


specify trend in number of populations (decline, stable, increasing, unknown)

n.a.


are there extreme fluctuations in number of populations (>1 order of magnitude)?

n.a.



Threats (actual or imminent threats to populations or habitats)

Threats to the species overall are currently poorly known but likely include:
- habitat losses on migration and wintering grounds
- habitat fragmentation and deterioration on breeding ground
There is currently no major threat operating in Canada.


Rescue Effect (immigration from an outside source): Moderate

does species exist elsewhere (in Canada or outside)?
Yes


Status of the outside population(s)?

Large but declining

is immigration known or possible?

Known

Would immigrants be adapted to survive here?

Yes


is there sufficient habitat for immigrants here?

Yes


Quantitative Analysis

None available