Horned lark, strigata subspecies COSEWIC assessment and status report: chapter 12
Technical Summary
Eremophila alpestris strigata
Horned Lark, strigata ssp. - Alouette hausse-col, de la sous-espèce strigata
Extent and Area Information
Population Information
Threats (actual or imminent threats to populations or habitats)
- Habitat loss on Vancouver Island due to urbanization
- Intensification of agriculture practices in the Fraser Valley
- Destruction of shoreline habitat due to dikes (Vancouver Delta)
- Invasive species (Vancouver Island)
- Increase in predators (everywhere)
USA: candidate for Endangered
Quantitative Analysis
N/A
Current Status:
not previously assessed by COSEWIC
Status and Reasons for Designation
Status: Endangered
Alpha-numeric code: B1ab(i-v)+2ab(i-v); C2a(i); D1
Reasons for Designation: Although this species has always been rare in Canada, it has declined steadily throughout its range over the last 50 years and it is currently nearly extirpated in Canada.
Applicability of Criteria
Criterion A (Declining Total Population): Not applicable; no numerical data for decline
Criterion B (Small Distribution, and Decline or Fluctuation): Meets Endangered B1ab (i-v) because of very small distribution and declines in all criteria, and Endangered B2ab(i-v) because of small area of occupancy and decline.
Criterion C (Small Total Population Size and Decline): Meets Endangered C2a(i) because of observed decline and fragmented population--Canadian population is somewhat disjunct from US and is very small (certainly less than 250). C1 not applicable because there are no numerical data for decline.
Criterion D (Very Small Population or Restricted Distribution): Meets Endangered D1 because of very small population (certainly less than 250)
Criterion E (Quantitative Analysis): Not done.
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