Western screech-owl (Otus kennicottii) COSEWIC assessment and status report: chapter 13

Technical Summary - macfarlanei subspecies

Otus kennicottii macfarlanei

Western Screech-owl, macfarlanei subspecies – Petit-duc des montagnes - macfarlanei

Range of Occurrence in Canada (by province / territory / ocean)

British Columbia

Extent and Area information

extent of occurrence (km²)

approximately 22,000 km²

specify trend (decline, stable, increasing, unknown)

stable

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

No

area of occupancy (km²)

approximately 100 km²

specify trend (decline, stable, increasing, unknown)

declining

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

no

number of extant locations

unknown (minimum ~25)

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

possible decline

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

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)

50-200

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

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 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)

  • 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)?

probably stable or slowly decreasing

is immigration known or possible?

Yes, but limited due to non-migratory nature of species

would immigrants be adapted to survive here?

Yes

is there sufficient habitat for immigrants here?

No; main threat is habitat loss

Quantitative Analysis

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