Townsend's mole (Scapanus townsendii) COSEWIC assessment and status report: chapter 12

Technical Summary

Scapanus townsendii

Common name:  Townsend’s mole

French common name: Taupe de Townsend

Range of Occurrence in Canada:
British Columbia

Extent and Area information

extent of occurrence (EO)(km²) :
20
specify trend (decline, stable, increasing, unknown) :
stable
are there extreme fluctuations in EO (> 1 order of magnitude)?
no
area of occupancy (AO) (km²) :
13
specify trend (decline, stable, increasing, unknown) :
stable
are there extreme fluctuations in AO (> 1 order magnitude)?
no
number of extant locations :
2
specify trend in # locations (decline, stable, increasing, unknown) :
stable
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.) :
1 yr
number of mature individuals (capable of reproduction) in the Canadian population (or, specify a range of plausible values) :
420-490
total population trend:  specify declining, stable, increasing or unknown trend in number of mature individuals :
stable
if decline, % decline over the last/next 10 years or 3 generations, whichever is greater (or specify if for shorter time period)
are there extreme fluctuations in number of mature individuals (> 1 order of magnitude)?
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)

  • urban development,
  • trapping by professional pest control companies
Rescue Effect (immigration from an outside source)
weak
does species exist elsewhere (in Canada or outside)?
yes
status of the outside population(s)?
unknown
is immigration known or possible?
yes
would immigrants be adapted to survive here?
yes
is there sufficient habitat for immigrants here?
yes

Quantitative Analysis

n/a

Page details

Date modified: