Bog bird’s-foot trefoil (Lotus pinnatus) COSEWIC assessment and status report: chapter 13
Technical Summary
Lotus pinnatus
bog birds-foot trefoil
lotier à feuilles pennées
Range of Occurrence in Canada: British Columbia
Extent and Area Information
Extent of occurrence (EO) (km2) (Polygon encompassing all known sites) |
100 km2 |
Specify trend in EO | decline |
Are there extreme fluctuations in EO? | no |
Area of occupancy (AO) (km2) (Area occupied by plants) |
<<1 km2 (<0.06 ha) |
Specify trend in AO | decline |
Are there extreme fluctuations in AO? | no |
Number of known or inferred current locations | 7 populations |
Specify trend in # | historic decline |
Are there extreme fluctuations in number of locations? | no |
Specify trend in area, extent or quality of habitat | declining |
Population Information
Generation time (average age of parents in the population) | several years (3-5 years?) |
Number of mature individuals | 1500-2000 |
Total population trend | declining (largest population will be significantly reduced if proposed development proceeds) |
% decline over the last/next 10 years or 3 generations | possibly 25% loss inferred if development proceeds |
Are there extreme fluctuations in number of mature individuals? | no |
Is the total population severely fragmented? | yes |
Specify trend in number of populations | decline |
Are there extreme fluctuations in number of populations? | no |
List populations with number of mature individuals in each«:
|
Threats (actual or imminent threats to populations or habitats)
- loss, degradation and fragmentation of habitat from proposed development and recreational use of all-terrain vehicles; invasive species
Rescue Effect (immigration from an outside source)
Status of outside population(s)? USA: Stable in some jurisdictions, uncertain in others |
|
Is immigration known or possible? | unlikely |
Would immigrants be adapted to survive in Canada? | unknown |
Is there sufficient habitat for immigrants in Canada? | uncertain |
Is rescue from outside populations likely? | unlikely |
Quantitative Analysis
Not Applicable
Other Status
Status and Reasons for Designation
Status: Endangered |
Alpha-numeric code: B1ab(ii,iii,v)+2ab(ii,iii,v); C1 |
Reasons for Designation: Few small fragmented populations that are geographically restricted and found within wetland meadows of limited occurrence and considerably disjunct from the main range of the species in the northwestern United States. Populations are at risk from continued habitat loss and encroachment of invasive species and from recreational off-road vehicular activities with the likelihood of significant losses due to planned commercial development of habitat supporting the only sizeable remaining population. |
Applicability of Criteria
Criterion A (Declining Total Population):
Not Applicable.
Not Applicable.
Criterion B (Small Distribution, and Decline or Fluctuation):
Endangered due to small distribution and decline under B1 and B2 (a) +(b, ii, iii, v) with EO about 100 km2 and AO <1 ha and highly fragmented localities with continuing decline anticipated in area of occupancy, area and quality of habitat and number of mature individuals.
Endangered due to small distribution and decline under B1 and B2 (a) +(b, ii, iii, v) with EO about 100 km2 and AO <1 ha and highly fragmented localities with continuing decline anticipated in area of occupancy, area and quality of habitat and number of mature individuals.
Criterion C (Small Total Population Size and Decline):
Endangered under C1 as a consequence of a small total population of 1500-2000 plants with continuing decline projected of about 25% if development of major site proceeds.
Endangered under C1 as a consequence of a small total population of 1500-2000 plants with continuing decline projected of about 25% if development of major site proceeds.
Criterion D (Very Small Population or Restricted Distribution):
Threatened under D2 due to the species’ small AO <20 km2 and only 7 localities
Threatened under D2 due to the species’ small AO <20 km2 and only 7 localities
Criterion E (Quantitative Analysis):
Not Applicable.
Not Applicable.
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