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COSEWIC Assessment and Status Report on the Yellow Rail in Canada

Technical Summary

Coturnicops noveboracensis

Yellow Rail

Râle jaune

Range of Occurrence in Canada (by province / territory / ocean)] AB, BC, MB, NB, NT, ON, QC, SK

Extent and Area Information

extent of occurrence (EO) (km2)3 million
specify trend (decline, stable, increasing, unknown)Stable
are there extreme fluctuations in EO (>1 order of magnitude)?No
area of occupancy (AO) (km2)Several 100s
specify trend (decline, stable, increasing, unknown)Declining
are there extreme fluctuations in AO (>1 order magnitude)?No
number of extant locations500 – 1000+
specify trend in # locations (decline, stable, increasing, unknown)Declining
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 habitatModerate/slow decline
Decline more severe on wintering grounds

Population Information

generation time (average age of parents in the population) (indicate years, months, days, etc.)2y or more
number of mature individuals (capable of reproduction) in the Canadian population (or, specify a range of plausible values)About 10 000
total population trend: specify declining, stable, increasing or unknown trend in number of mature individualsUncertain; possibly declining
if decline, % decline over the last/next 10 years or 3 generations, whichever is greater (or specify if for shorter time period)Unknown
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 eachn.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) [add rows as needed]

- declining habitat in area and quality, especially on wintering grounds which might be limiting to this species survival

Rescue Effect (immigration from an outside source): Not relevant

does species exist elsewhere (in Canada or outside)?Yes
status of the outside population(s)?1000 – 1500 inds at 100+ sites; declining
is immigration known or possible?Yes
would immigrants be adapted to survive here?Yes
is there sufficient habitat for immigrants here?Yes

Quantitative Analysis

None available