Lake Ontario and Great Lakes kiyi COSEWIC assessment and status report: chapter 11

Technical Summary: Coregonus kiyi orientalis

Coregonus kiyi orientalis (C. k. orientalis)

Lake Ontario Kiyi – kiyi du lac Ontario

Range of Occurrence in Canada:

Ontario - Lake Ontario.

Extent and Area information

Extent of occurrence (EO) (km²)

19,477 km² Measured as combined total areas of the lake.

Specify trend

Decline

Are there extreme fluctuations in EO (> 1 order of magnitude)?

No

Area of occupancy (AO) (km²)

8,553 km² Measured as combined areas of depths >100m

Specify trend

Decline

Are there extreme fluctuations in AO (> 1 order magnitude)?

No

Number of extant locations (Occupy 1 large lake, but population structure is unknown)

0

Specify trend in # locations

Not Applicable

Are there extreme fluctuations in # locations (>1 order of magnitude)?

Not Applicable

Habitat trend

Stable?

Population information

Generation time (average age of parents in the population

5 years?

Number of mature individuals (capable of reproduction) in the Canadian

0

Total population trend

Decline

If decline, % decline over the last/next 10 years or 3 generations, whichever is greater

0% over last 15 years, last found in 1964

Are there extreme fluctuations in number of mature individuals (> 1 order of magnitude)?

No

Is the total population severely fragmented

No

List each population and the number of mature individuals in each

0

Specify trend in number of populations (decline, stable, increasing, unknown)

Decline

Are there extreme fluctuations in number of populations (>1 order of magnitude)?

No

Threats

  • commercial overexploitation, introduced species.

Rescue Effect (immigration from an outside source)

None?

Does subspecies exist elsewhere (in Canada or outside)?

No

Status of the outside population(s)?

Not Applicable

Is immigration known or possible?

No

Would immigrants be adapted to survive here?

Yes

Is there sufficient habitat for immigrants here?

Yes

Quantitative Analysis

Data not available

Existing Status - C. kiyi orientalis

  • Nature Conservancy Ranks (NatureServe 2005)
    • Global - G3TX
    • National
      • United States - NX
      • Canada - NNR
    • Regional - X in all states
  • Wild Species 2000 (Canadian Endangered Species Council 2001)
    • Canada - NR
    • Ontario - NR
  • COSEWIC - Extinct (May 2005)

Status and Reasons for Designation

Status: Extinct

Alpha-numeric Code: Not Applicable

Reasons for Designation: Last recorded from Lake Ontario in 1964, the subspecies was driven to extinction by commercial exploitation, and predation/competition by introduced species.

Applicability of Criteria

  • Criterion A (Declining Total Population): Not applicable - The subspecies has not been seen in Lake Ontario since 1964.
  • Criterion B (Small Distribution, and Decline or Fluctuation): Not applicable - The subspecies has not been seen in Lake Ontario since 1964.
  • Criterion C (Small Total Population Size and Decline): Not applicable - The subspecies has not been seen in Lake Ontario since 1964.
  • Criterion D (Very Small Population or Restricted Distribution): Not Applicable - The subspecies has not been seen in Lake Ontario since 1964.
  • Criterion E (Quantitative Analysis): Data are not available.

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