Smooth goosefoot (Chenopodium subglabrum) COSEWIC assessment and status report: chapter 11
Technical Summary
Chenopodium subglabrum
Smooth goosefoot: chénopode glabre
Extent and Area Information
Number of known or inferred current locations:
- AB: 1 extant, 8 not confirmed
- SK: 24 extant, 2 not confirmed, 5 likely extirpated
- MB: 2 extant
Population Information
List populations with number of mature individuals in each:
Fluctuates from year to year:
- Alberta: 200-300,
- Saskatchewan: 5,000-9,700,
- Manitoba: 75-100
Threats (actual or imminent threats to populations or habitats)
Dune stabilization, grazing and fire control, invasive exotics, recreational activities and oil and gas exploration.
Rescue Effect (immigration from an outside source)
Status of outside population(s)?
USA:
South Dakota, Utah and Washington
Quantitative Analysis
Not available
Current Status
Special Concern (1992)
Status and Reasons for Designation
Reasons for Designation:
An herbaceous annual with fluctuating populations of relatively small size. The species is restricted to areas of active sand habitats in southern Alberta, Saskatchewan and Manitoba. Current risks to the species include sand dune stabilization, invasive species, oil and gas development and recreational activities.
Applicability of Criteria
Criterion A: (Declining Total Population): Not applicable
Criterion B: (Small Distribution, and Decline or Fluctuation): Meets Endangered B2b (iii)c(iv) based on its small area of occupancy, loss in area and quality of habitat, and large fluctuations in population size.
Criterion C: (Small Total Population Size and Decline): Not applicable. Population size >2,500 and possibly <10,000 but percent decline over 10 years is uncertain due to lack of adequate monitoring and natural population fluctuations; continuing decline could be inferred in habitat due to stabilization of habitat by invasive plants but some populations >1,000 mature plants and not all mature plants in one population.
Criterion D: (Very Small Population or Restricted Distribution): Not applicable. Population size is too large and area of occupancy is >20km² and number of locations is >5.
Criterion E: (Quantitative Analysis): Not available.
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