Slender collomia (Collomia tenella) COSEWIC assessment and status report: chapter 12
Technical Summary
Collomia tenella
Slender Collomia – collomia délicat
Range of Occurrence in Canada:
British Columbia
Extent and Area Information
Extent of occurrence (EO)(km²)
Based on area of the single site. ≤1 (56 m²)
Specify trend in EO:
Unknown
Are there extreme fluctuations in EO?
Unknown
Area of occupancy (AO) (km²)
Based on an approximation of habitats occupied. ≤1 (56 m²)
Specify trend in AO:
Unknown
Are there extreme fluctuations in AO?
Unknown
Number of known or inferred current locations:
1
Specify trend in #:
Unknown
Are there extreme fluctuations in number of locations?
Unknown
Specify trend in area, extent or quality of habitat:
Unknown
Population Information
Generation time (average age of parents in the population):
1 year
Number of mature individuals:
0-127
Total population trend:
fluctuating numbers of plants
% decline over the last/next 10 years or 3 generations.
N/A
Are there extreme fluctuations in number of mature individuals?
Yes
Is the total population severely fragmented?
1 population known and considerably disjunct from nearest site in WA state
Specify trend in number of populations:
Unknown
Are there extreme fluctuations in number of populations?
Unknown
List populations with number of mature individuals in each:
Princeton, Stevenson Lake area - 127 individuals
Threats (actual or imminent threats to populations or habitats)
- Development - roads, housing, sand removal
- Introduced species encroachment
Rescue Effect (immigration from an outside source)
Status of outside population(s)?
USA: Unknown status in 4 jurisdictions (WA, OR, ID & NV) and imperiled in WY and UT.
Is immigration known or possible?
Unknown
Would immigrants be adapted to survive in Canada?
Unknown
Is there sufficient habitat for immigrants in Canada?
Unknown
Is rescue from outside populations likely?
Unlikely
Quantitative Analysis
N/A
Current Status
COSEWIC: Endangered
Status and Reasons for Designation
Status: Endangered
Alpha-numeric code: Met criteria for Endangered, B1ac(iv)+2ac(iv); D1.
Reasons for Designation: An annual herb present at a single sandy site near Princeton, British Columbia. The population fluctuates widely from year to year. At risk to stochastic events, roadside development, sand removal, and invasion by alien species.
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