Scouler's catchfly (Silene scouleri ssp. grandis): COSEWIC assessment and status report: chapter 12
Technical Summary
Silene scouleri ssp. grandis
Coastal Scouler’s catchfly – grand silène de Scouler
Range of Occurrence in Canada:
British Columbia
Extent and Area information
extent of occurrence (EO) (km²)
<1 km² remaining
specify trend :
Declining
are there extreme fluctuations in EO (> 1 order of magnitude)?
No
area of occupancy (AO) (km²) :
~ 0.0158 km² (1.58 hectare)
specify trend (decline, stable, increasing, unknown) :
Declining
are there extreme fluctuations in AO (> 1 order magnitude)?
No
number of extant locations :
2
specify trend in # locations (decline, stable, increasing, unknown) :
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 quality and extent
Population information
generation time (average age of parents in the population) (indicate years, months, days, etc.) :
uncertain (2 years to flowering ?)
number of mature individuals (capable of reproduction) in the Canadian population (or, specify a range of plausible values) :
250-350
total population trend: specify declining, stable, increasing or unknown trend in number of mature individuals :
Decline (loss of one population since 2000 with possibly 1-3 plants lost)
if decline, % decline over the last/next 10 years or 3 generations, whichever is greater (or specify if for shorter time period) :
Very small ?
are there extreme fluctuations in number of mature individuals (> 1 order of magnitude)?
Unlikely
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)?
Yes
list each population and the number of mature individuals in each :
- Trial Island sub-popopulation: 5
- Little Trial Island sub-population: 23
- Alpha Islet population 250-300
specify trend in number of populations (decline, stable, increasing, unknown) :
Decline
are there extreme fluctuations in number of populations (>1 order of magnitude)?
No
Threats (actual or imminent threats to populations or habitats)
- potential threats to these populations: habitat loss, habitat degradation, trampling, pollution, competition with exotic plants
Rescue Effect (immigration from an outside source)
Low
does species exist elsewhere (in Canada or outside)?
USA
status of the outside population(s)?
Stable
is immigration known or possible?
Unknow
would immigrants be adapted to survive here?
Yes
is there sufficient habitat for immigrants here?
Yes
Quantitative Analysis
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