Northern brook lamprey (Ichthyomyzon fossor) COSEWIC assessment and status report: chapter 12
Technical Summary: Saskatchewan – Nelson
Ichthyomyzon fossor
Northern brook lamprey – Lamproie du nord
Range of Occurrence in Canada:
Manitoba (Saskatchewan – Nelson Biogeographic Area)
Extent and Area Information
Extent of occurrence (EO) (km²) – based on Figure 2
5,000 km²
Specify trend in EO
Unknown
Are there extreme fluctuations in EO?
Unknown
Area of occupancy (AO) (km²) – based on Table 1 (sum of stream widths x occupied lengths)
5 km²
Specify trend in AO
Unknown
Are there extreme fluctuations in AO?
Unknown
Number of known or inferred current locations
2 streams
Specify trend in #
Unknown
Are there extreme fluctuations in number of locations?
Unknown
Specify trend in area, extent or quality of habitat
Unknown
Population Information
Generation time (average age of parents in the population)
6 years
Number of mature individuals
Unknown
Total population trend:
Unknown
% decline over the last/next 10 years or 3 generations.
Unknown
Are there extreme fluctuations in number of mature individuals?
Unknown
Is the total population severely fragmented?
No
Specify trend in number of populations
Stable
Are there extreme fluctuations in number of populations?
No
List populations with number of mature individuals in each
Unknown
Threats (actual or imminent threats to populations or habitats)
Stream barriers impeding gene flow, sedimentation.
Rescue Effect (immigration from an outside source)
Status of outside population(s)? USA: Stable [other jurisdictions or agencies]
Is immigration known or possible?
Possible, but unlikely due to non-migratory behaviour
Would immigrants be adapted to survive in Canada?
Yes
Is there sufficient habitat for immigrants in Canada?
Yes
Is rescue from outside populations likely?
No
Other Status
COSEWIC: Special Concern (1991)
Classified as S2 (imperiled) in Manitoba, S3 (vulnerable) in Ontario and Quebec.
Status: Data Deficient
Alpha numeric code: not applicable
Reason for Designation: This nonparasitic lamprey has not been the subject of any targeted and comprehensive survey since it was first reported from Manitoba in the late 1970s, and accordingly, the distribution and status of its populations are not well known.
Applicability of criteria
- Criterion A: Not met.
- Criterion B: Not met.
- Criterion C: Not met.
- Criterion D: Not met.
- Criterion E: Not met.
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