Rough agalinis (Agalinis aspera) COSEWIC assessment and status report: chapter 11
Technical Summary
Agalinis aspera
Rough agalinis – gérardie rude
Range of Occurrence in Canada:
southern Manitoba
Extent and Area Information
Extent of occurrence (EO) (km²)
The area of a polygon connecting Brandon, St. Laurent and Grosse Isle was measured, excluding the area which is lake. 3725 km²
Specify trend in EO :
unknown
Are there extreme fluctuations in EO?
unknown
Area of occupancy (AO) (km²)
Length and width of sites was measured in the field by pacing or using the GPS unit. <5 km²
Specify trend in AO :
unknown
Are there extreme fluctuations in AO?
unknown
Number of known or inferred current locations :
11
Specify trend in # :
unknown
Are there extreme fluctuations in number of locations?
no
Specify trend in area, extent or quality of habitat :
inferred decline
Population Information
Generation time (average age of parents in the population) :
Annual species
Number of mature individuals
< 250
Total population trend:
decline
% decline over the last/next 10 years or 3 generations.
unknown
Are there extreme fluctuations in number of mature individuals?
Possibly but unknown
Is the total population severely fragmented?
yes
Specify trend in number of populations :
uncertain if any recent losses
Are there extreme fluctuations in number of populations?
no
List populations with number of mature individuals in each:
Threats
Habitat impact due to mowing, prairie burning, and overgrazing. Alteration of roadsides has already eliminated 1 population.
Rescue Effect
Status of outside population(s)?
USA: mainly not ranked or under review in adjoining states
Is immigration known or possible?
Unlikely; nearest US population is 200 km to the south in North Dakota
Would immigrants be adapted to survive in Canada?
Yes
Is there sufficient habitat for immigrants in Canada?
Limited, yes
Is rescue from outside populations likely?
No
Quantitative Analysis
not available
Current Status
COSEWIC: Endangered (2006)
Status and Reasons for Designation
Status: Endangered
Alpha-numeric code: B1ab(ii, iii, iv, v) + 2ab(ii, iii, iv, v); C2a(i)
Reasons for Designation: An herbaceous annual having a restricted geographical range and occupying small prairie remnants mainly along roadsides in southern Manitoba. The few small populations are at risk from such impacts as late season mowing, burning, overgrazing and road expansion.
Applicability of Criteria
Criterion A: (Declining Total Population): n/a No data available
Criterion B: (Small Distribution, and Decline or Fluctuation): Met Endangered under B1 ab(ii, iii, iv, v) + 2ab(ii, iii, iv, v) based on extent of occurrence and area of occupancy below critical values with the 11 populations being highly fragmented and impacted by declining quality of habitat due to a number of documented impacts. A population loss along provincial road 227 due to road improvements in the last 15 years indicates a decline in area of occupancy and loss of mature individuals.
Criterion C: (Small Total Population Size and Decline): Met Endangered C2a(i) due to its total population being much less than 2,500 plants with inferred decline in numbers of mature plants due to various threats and no population having >250 mature plants.
Criterion D: (Very Small Population or Restricted Distribution): Likely more than 250 mature plants but maximum number unknown.
Criterion E: (Quantitative Analysis): Not available.
Uncertainty: There potentially may be more than 250 mature individuals. A large area of PFRA prairie exists (>10,000 ha) at the Portage and Woodlands community pastures with only the roadsides surveyed along these pastures.
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