Deepwater sculpin (Myoxocephalus thompsonii), various populations: chapter 13
Technical Summary
Range of occurrence by province and territory: ON, QC
COSEWIC Aquatic Ecozones represented in the species’ range:
- Ecozone 10: Great Lakes – Western St. Lawrence
Extent and Area Information
trend in EO
Stable
are there extreme fluctuations in EO (> 1 order of magnitude)?
No
area of occupancy (AO) many locations, not calculated, but considerably less than EO
< 800 000 km 2
trend in AO
Unknown
are there extreme fluctuations in AO (> 1 order magnitude)?
No
number of extant locations
10 lakes
trend in # locations
Decline (3 apparently extirpated 2 in QC and 1 in ON), Lake Huron - decline
are there extreme fluctuations in # locations (>1 order of magnitude)?
No
habitat trend
Some decline
Population Information
number of mature individuals (capable of reproduction) in the Canadian population)
Unknown
Total population trend:
Decline
if decline, % decline over the last/next 10 years or 3 generations, whichever is greater
Unknown
are there extreme fluctuations in number of mature individuals (> 1 order of magnitude)?
Unknown
is the total population severely fragmented?
Yes
list each population and the number of mature individuals in each
ON - Lakes Superior, Huron, Erie, Ontario, Fairbank, and Nipigon
QC - Lakes Roddick, des Iles, Thirty-one-Mile, and Heney
Unknown in all
specify trend in number of populations (decline, stable, increasing, unknown)
Decline- 2 locations extirpated in QC, 1 in ON
are there extreme fluctuations in number of populations (>1 order of magnitude)?
No
Threats (actual or imminent threats to populations or habitats)
Competition and predation with invasive species; pollution; eutrophication
Rescue Effect (immigration from an outside source)
Secure except for NY – S!
is immigration known or possible?
Possible only in Gt. Lakes
would immigrants be adapted to survive here?
Unknown
is there sufficient habitat for immigrants here?
Yes
Quantitative Analysis
Not Applicable
Existing Status
Nature Conservancy Ranks (NatureServe 2005)
Global– G5
National
US – N5
Canada N4
Regional
US: IN – S4, MI – S5, MN – SSNR, NY – S1, OH – SNR, PA – SX, WI – S4
Canada: AB – S1, MB – S2S3, NT – SNR, ON – S4, QC – S1S2, SK – S5
Wild Species 2000 (Canadian Endangered Species Council 2001)
Canada - NA
Provinces – AB – 5, MB – 2*, ON – 4, QC – 2, NT – 3, SK – 5
*Duncan indicates that this should be 3 or 4 (J. Duncan, Biodiversity Conservation Section, Manitoba Conservation, Winnipeg, Manitoba; rank comments in relation to the data output for the Wild Species web site for freshwater fish species).
Status and Reasons for Designation
Reasons for Designation: This species occurs in the deeper parts of 10 coldwater lakes, including lakes Superior, Huron and Ontario, in Ontario and Quebec. Previously thought to be exterminated in Lake Ontario, it now appears to be reestablished in that lake, albeit in small numbers. Populations have been exterminated in 2 lakes in Quebec due to eutrophication of these lakes, and may be in decline in Lake Huron, possibly in relation to the introduction of zebra mussel.
Applicability of Criteria
Criterion A (Declining Total Population):
Not Applicable – no evidence to establish decline.
Criterion B (Small Distribution, and Decline or Fluctuation):
Not Applicable – Wide distribution – population abundance and trend information not available.
Criterion C (Small Total Population Size and Decline):
Not Applicable – population abundance and trend information not available.
Criterion D (Very Small Population or Restricted Distribution):
Not Applicable. Widespread distribution.
Criterion E (Quantitative Analysis):
Not Applicable – no data.
Range of occurrence by province and territory: NWT, AB, SK, MB, ON, QC
COSEWIC Aquatic Ecozones represented in the species’ range:
- Ecozone 13: Western Arctic (corresponds to the portion of the species’ range in the Northwest Territories and Northern Saskatchewan)
- Ecozone 5: Western Hudson Bay (corresponds to the portion of the species’ range in Northeastern Saskatchewan)
- Ecozone 4: Saskatchewan/Nelson (corresponds to the portion of the species’ range in Alberta, Central Saskatchewan, Manitoba, and Northwestern Ontario)
Extent and Area Information
trend in EO
Unknown
are there extreme fluctuations in EO (> 1 order of magnitude)?
No
area of occupancy (AO) many locations, not calculated, but considerably less than EO
< 1 000 000 km 2
trend in AO
Unknown
are there extreme fluctuations in AO (> 1 order magnitude)?
No
number of extant locations
52 lakes in 3 ecozones
trend in # locations
Unknown - 4 apparently extirpated, but found at 4 new locations
are there extreme fluctuations in # locations (>1 order of magnitude)?
No
habitat trend
Some decline
Population Information
number of mature individuals (capable of reproduction) in the Canadian population)
Unknown
Total population trend:
Unknown
if decline, % decline over the last/next 10 years or 3 generations, whichever is greater
Unknown
are there extreme fluctuations in number of mature individuals (> 1 order of magnitude)?
Unknown
is the total population severely fragmented?
Yes
list each population and the number of mature individuals in each
Unknown in all
Ecozone 13 NT – Gt. Slave, La Marte, Keller, GT
Bear and Alexie lakes
SK – Reindeer, Wollaston, Athabasca, Black, Riou, Beaverlodge, Canoe, East, Hatchet, Laonil, Milliken, Waterbury, Yalowega, C1 lakes
Ecozone 4 SK – La Ronge, La Plonge, Mirond, MacKay, McLenna
MB – Athapapuskow, Cranberry Lakes Westhawk, George and Clearwater lakes
ON – Lake 259, Teggau, Lake 310, Lake 258, High, William, Horseshoe, Dicker, Passover, Burton, Trout, Eagle, Cedar, Raven , Burchell, Saganaga, Squeers, Huston, Notellum, Manitou and Teggau lakes
specify trend in number of populations (decline, stable, increasing, unknown)
Unknown
are there extreme fluctuations in number of populations (>1 order of magnitude)?
No
Threats (actual or imminent threats to populations or habitats)
Competition and predation with invasive species; pollution; eutrophication
Rescue Effect (immigration from an outside source)
is immigration known or possible?
Not Possible
would immigrants be adapted to survive here?
Unknown
is there sufficient habitat for immigrants here?
Yes
Quantitative Analysis
Not Applicable
Existing Status
Nature Conservancy Ranks (NatureServe 2005)
Global– G5
National
US – N5
Canada N4
Regional
US: IN – S4, MI – S5, MN – SSNR, NY – S1, OH – SNR, PA – SX, WI – S4
Canada: AB – S1, MB – S2S3, NT – SNR, ON – S4, QC – S1S2, SK – S5
Wild Species 2000 (Canadian Endangered Species Council 2001)
Canada - NA
Provinces – AB – 5, MB – 2*, ON – 4, QC – 2, NT – 3, SK – 5
*Duncan indicates that this should be 3 or 4 (J. Duncan, Biodiversity Conservation Section, Manitoba Conservation, Winnipeg, Manitoba; rank comments in relation to the data output for the Wild Species web site for freshwater fish species).
Status and Reasons for Designation
Reasons for Designation: This species is widely distributed in western Canada where it is found in the deepest parts of at least 52 coldwater lakes in northwestern Ontario, Manitoba, Saskatchewan, Alberta and the Northwest Territories. There is no evidence to indicate population declines, or of any threats that would convey a degree of risk to these populations.
Applicability of Criteria
Criterion A (Declining Total Population):
Not Applicable – no evidence to establish decline.
Criterion B (Small Distribution, and Decline or Fluctuation):
Not Applicable – Wide distribution – population abundance and trend information not available.
Criterion C (Small Total Population Size and Decline):
Not Applicable – population abundance and trend information not available.
Criterion D (Very Small Population or Restricted Distribution):
Not Applicable. Widespread distribution.
Criterion E (Quantitative Analysis):
Not Applicable – no data.
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