Grand coulee owl-clover (Orthocarpus barbatus) COSEWIC assessment and status report: chapter 13

Technical summary

Orthocarpus barbatus
Grand Coulee Owl-clover

Orthocarpe barbu

Range of Occurrence in Canada: British Columbia


Extent and area information

Extent of occurrence (EO) (km 2 ).
[area encompassing all known localities]
45 km 2
Specify trend in EO.
Unknown
Are there extreme fluctuations in EO?
No
Area of occupancy (AO) (km 2 ).
[actual area occupied by populations]
<< 1 km 2
(0.004 km 2 )
Specify trend in AO.
Probably declining
Are there extreme fluctuations in AO?
No
Number of known or inferred current locations.
4
Specify trend in #.
Unknown
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).
3 months
Number of mature individuals.
9 000-12 500
Total population trend.
Unknown
% 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?
Yes, migration between present populations unlikely
Specify trend in number of populations.
Unknown
Are there extreme fluctuations in number of populations?
No
List populations with number of mature individuals Iin each:
Mt. Kruger, golf course: ?

“Veronica Lake”: 367

Mt. Kruger, above track:
3222-3722

KilpoolaLake area:
5485-8485


Threats (actual or imminent threats to populations or habitats)

  • alien species invasion, urban and agricultural development


Rescue effect (immigration from an outside source)

Status of outside population(s)?
USA: unknown
Is immigration known or possible?
Unknown
Would immigrants be adapted to survive in Canada?
Yes
Is there sufficient habitat for immigrants in Canada?
Yes
Is rescue from outside populations likely?
Low probability


Quantitative analysis

[provide details on calculation, source(s) of data, models, etc.]
N/A


Current status

Committee on the Status of Endangered Wildlife in Canada (COSEWIC): Endangered (May 2005)


Status and reasons for designation

Status: Endangered
Alpha-numeric code: B1ab(ii,iii,iv,v) + 2 ab (ii,iii,iv,v)c(iv)


Reasons for Designation: A semiparasitic annual restricted to a small area east of the Cascade Mountains. The few small populations are subject to extreme fluctuations in numbers of mature plants and at continued risk from introduced weeds, overgrazing and housing developments. One population in South Okanagan Grasslands Protected Area is protected from development.


Applicability of criteria

Criterion A (Declining Total Population): Not applicable.

Criterion B (Small Distribution, and Decline or Fluctuation): Meets endangered (B1ab(ii,iii,iv,v)c(iv) + 2ab (ii,iii,iv,v)c(iv) based on extent of occurrence < 5000 km2 and area of occupancy <500 km2 with only 4 populations and continuing decline projected in area of occupancy, extent and quality of habitat, possible loss of entire populations, and number of individuals (due to spread of exotics and expansion of development on private lands); it is also subject to extreme fluctuations in number of mature individuals.

Criterion C (Small Total Population Size and Decline): Meets threatened C2b with <10 000 plants subject to continued decline in numbers and extreme fluctuations in number of mature individuals.

Criterion D (Very Small Population or Restricted Distribution): Meets threatened D2 based on an area of occupancy <<20 km2 and only 4 populations at risk from habitat loss due to continued spread of exotic plants and potential expansion of development activities on private lands in close proximity to existing populations.

Criterion E (Quantitative Analysis): Not applicable.

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