Life History Notes for a Population of Slimy Sculpin (Cottus cognatus) in an Alaskan Arctic Stream

1976 ◽  
Vol 33 (7) ◽  
pp. 1639-1642 ◽  
Author(s):  
P. C. Craig ◽  
J. Wells
Keyword(s):  
Life History ◽  
Food Item ◽  
Cottus Cognatus ◽  
Chironomid Larvae ◽  
River Drainage ◽  
Yukon River ◽  
Slimy Sculpin ◽  
Alaskan Arctic ◽  
Slow Growing ◽  
Growing Population

The distribution of a slow-growing population of slimy sculpin (Cottus cognatus) extends farther than most fishes into the headwaters of the Chandalar River, Yukon River drainage. The maximum observed age was 7 by which time the fish averaged only 101 mm in length. Most sculpin matured at age 4. The spawning season appeared to be shortly after spring breakup (late May). Fecundity averaged 206 eggs (range 59–339 eggs). The fish fed almost exclusively on stream benthos, chironomid larvae being the most common food item.

Jumbo spotted form of least cisco Coregonus sardinella in lakes of southern Yukon Territory

1982 ◽  
Vol 60 (11) ◽  
pp. 2783-2786 ◽  
Author(s):  
C. C. Lindsey ◽  
L. F. Kratt
Keyword(s):  
Yukon Territory ◽  
Sympatric Populations ◽  
Dissolved Solids ◽  
River Drainage ◽  
Yukon River ◽  
Gill Raker ◽  
Slow Growing

Four lakes on the upper Yukon River drainage contain a strikingly spotted jumbo form of least cisco, with fork lengths up to 452 mm, larger than all previously known lacustrine or anadromous forms. The jumbo fish, with high gill raker counts (48–52), are probably nonmigratory. They may in each lake represent parallel responses to high dissolved solids, little competition, and unusually favourable conditions for growth. Available material is insufficient to establish whether small specimens in these lakes are young or slow-growing individuals of the jumbo spotted form, or whether the lakes contain two sympatric populations.

Life history and status of the shorthead sculpin (Cottus confusus: Pisces, Cottidae) in Canada and the sympatric relationship to the slimy sculpin (Cottus cognatus)

1984 ◽  
Vol 62 (2) ◽  
pp. 306-311 ◽  
Author(s):  
Grant W. Hughes ◽  
Alex E. Peden
Keyword(s):  
Life History ◽  
Habitat Loss ◽  
Ecological Factors ◽  
Cottus Cognatus ◽  
Diagnostic Characters ◽  
Slimy Sculpin ◽  
Flathead River

Cottus confusus inhabits downstream portions of the Flathead River in Canada and the population may be seriously threatened. Cottus cognatus occupies habitats farther upstream than C. confusus but few differences in other ecological factors were found between the species. Downstream habitat loss may occur if coal is improperly mined from within the watershed. Because some field biologists were unable to distinguish between these species, diagnostic characters were used to produce a character index.

Life-history Plasticity Among Stream Sites in the Chattahoochee River Drainage, Alabama

2008 ◽  
Vol 7 (4) ◽  
pp. 679-690 ◽  
Author(s):  
Lemuel R. Casten ◽  
Carol E. Johnston
Keyword(s):  
Life History ◽  
River Drainage ◽  
Chattahoochee River

Site fidelity of slimy sculpin (Cottus cognatus): insights from stable carbon and nitrogen analysis

2004 ◽  
Vol 61 (9) ◽  
pp. 1717-1722 ◽  
Author(s):  
M A Gray ◽  
R A Cunjak ◽  
K R Munkittrick
Keyword(s):  
Environmental Impacts ◽  
Site Fidelity ◽  
Fish Muscle ◽  
Sentinel Species ◽  
Agricultural Activity ◽  
Local Conditions ◽  
Cottus Cognatus ◽  
Site Specific ◽  
Isotopic Signatures ◽  
Slimy Sculpin

Concerns regarding sentinel species for assessing environmental impacts include residency, abundance, and suitability for measuring responses, if effects are to be attributable to local conditions. Stable isotope analysis was used as a tool to investigate site fidelity of slimy sculpin (Cottus cognatus) to establish residency and exposure for the sculpin. We predicted that sculpin collected from sites adjacent to agricultural activity would show higher δ15N values than those collected from sites in forested areas because of isotopic enrichment by fertilizers in the former. The predominant use of chemical fertilizer applications in the region, however, resulted in no specific enrichment of 15N in sculpin collected in the agricultural region. However, there was an incremental enrichment in the fish muscle tissue of approximately 5‰ in δ13C values in a downstream direction, irrespective of surrounding land use. As a result, the dual-isotope comparison was successful at demonstrating site-specific isotopic signatures across sites for 30 km of the river system. The site-specific signatures suggest that slimy sculpin are not moving considerable distances among sites and are incorporating their isotopic signatures over a narrow spatial scale. The results support the use of the slimy sculpin as a sentinel species for investigating site-specific environmental impacts.

A comparison of slimy sculpin (Cottus cognatus) populations in arctic lakes with and without piscivorous predators

Toolik Lake ◽  
1992 ◽  
pp. 189-201 ◽  
Author(s):  
Kristi L. Hanson ◽  
Anne E. Hershey ◽  
Michael E. McDonald
Keyword(s):  
Arctic Lakes ◽  
Cottus Cognatus ◽  
Slimy Sculpin
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