Bird's-foot violet (Viola pedata) COSEWIC assessment and status report: chapter 12

Technical Summary

Viola pedata L.

Bird’s-foot violet
Violette pédalée

Occurs only in Ontario


Extent and Area Information

Extent of occurrence (EO)(km2)

40 km2


specify trend (decline, stable, increasing, unknown)

Stable


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

No


area of occupancy (AO)(km2)

1.5 km2


specify trend (decline, stable, increasing, unknown)

Decline


are there extreme fluctuations in AO (> 1 order magnitude)?

No


number of extant locations

5


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.)

several years to flowering?


number of mature individuals (capable of reproduction) in the Canadian population (or, specify a range of plausible values)

Perhaps 5000


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)

25-50%


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)?

Yes


list each population and the number of mature individuals in each


specify trend in number of populations (decline, stable, increasing, unknown)

Decline (including historical records)


are there extreme fluctuations in number of populations (>1 order of magnitude)?

No



Threats (actual or imminent threats to populations or habitats)

  • Trampling by site visitors, succession and shading, housing development


Rescue Effect (immigration from an outside source)

does species exist elsewhere (in Canada or outside)?

Yes


status of the outside population(s)?

Secure


is immigration known or possible?

Not likely


would immigrants be adapted to survive here?

Possibly


is there sufficient habitat for immigrants here?

Little



Quantitative Analysis

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