Western screech-owl (Otus kennicottii) COSEWIC assessment and status report: chapter 12
Technical Summary - kennicottii subspecies
Otus kennicottii kennicottii
Western Screech-owl, kennicottii subspecies – Petit-duc des montagnes – kennicottii
Range of occurrence in Canada (by province / territory / ocean)
British Columbia
Extent and Area information
extent of occurrence (km²)
approximately 200,000 km²
specify trend (decline, stable, increasing, unknown)
probably stable
are there extreme fluctuations in extent of occurrence (> 1 order of magnitude)?
no
area of occupancy (km²)
approximately 50,000 km²
specify trend (decline, stable, increasing, unknown)
decline
are there extreme fluctuations in area of occupancy (> 1 order magnitude)?
No
number of extant locations
Not applicable (n.a.)
specify trend in # locations (decline, stable, increasing, unknown)
n.a.
are there extreme fluctuations in # locations (>1 order of magnitude)?
n.a.
habitat trend: specify declining, stable, increasing or unknown trend in area, extent or quality of habitat
declining
Population information
generation time (average age of parents in the population) (indicate years, months, days, etc.)
2-3 yrs
number of mature individuals (capable of reproduction) in the Canadian population (or, specify a range of plausible values)
3,000-10,000
total population trend: specify declining, stable, increasing or unknown trend in number of mature individuals
slow decline
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 each
-
specify trend in number of populations (decline, stable, increasing, unknown)
-
are there extreme fluctuations in number of populations (>1 order of magnitude)?
-
Threats (actual or imminent threats to populations or habitats)
- Barred Owl depredation
- Loss of habitat due to development/agriculture
- Possible loss of nest cavity trees associated with forestry
Rescue Effect (immigration from an outside source)
Moderate
does species exist elsewhere (in Canada or outside)?
Yes
status of the outside population(s)?
declining
is immigration known or possible?
Yes, but limited due to non-migratory nature of species
would immigrants be adapted to survive here?
limited perhaps by presence of Barred Owls
is there sufficient habitat for immigrants here?
limited by habitat loss
Quantitative Analysis
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