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 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.

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

Brain size evolution in anurans: a review

2019 ◽  
Vol 69 (3) ◽  
pp. 265-279 ◽  
Author(s):  
Chun Lan Mai ◽  
Wen Bo Liao
Keyword(s):  
Sexual Selection ◽  
Life History ◽  
Life History Traits ◽  
Developmental Stages ◽  
Brain Size ◽  
Ecological Factors ◽  
Brain Regions ◽  
Sperm Length ◽  
Testis Size ◽  
Size Evolution

Abstract Selection pressure is an important force in shaping the evolution of vertebrate brain size among populations within species as well as between species. The evolution of brain size is tightly linked to natural and sexual selection, and life-history traits. In particular, increased environmental stress, intensity of sexual selection, and slower life history usually result in enlarged brains. However, although previous studies have addressed the causes of brain size evolution, no systematic reviews have been conducted to explain brain size in anurans. Here, we review whether brain size evolution supports the cognitive buffer hypothesis (CBH), the expensive tissue hypothesis (ETH), or the developmental cost hypothesis (DCH) by analyzing the intraspecific and/or interspecific patterns in brain size and brain regions (i.e., olfactory nerves, olfactory bulbs, telencephalon, optic tectum, and cerebellum) associated with ecological factors (habitat, diet and predator risk), sexual selection intensity, life-history traits (age at sexual maturity, mean age, longevity, clutch size and egg size, testis size and sperm length), and other energetic organs. Our findings suggest that brain size evolution in anurans supports the CBH, ETH or DCH. We also suggest future directions for studying the relationships between brain size evolution and crypsis (i.e., ordinary mucous glands in the skin), and food alteration in different developmental stages.

IMPACTS OF NONPOINT INPUTS FROM POTATO FARMING ON POPULATIONS OF SLIMY SCULPIN (COTTUS COGNATUS)

2005 ◽  
Vol 24 (9) ◽  
pp. 2291 ◽  
Author(s):  
Michelle A. Gray ◽  
R. Allen Curry ◽  
Kelly R. Munkittrick
Keyword(s):  
Cottus Cognatus ◽  
Slimy Sculpin

scholarly journals Distributional range, ecology, and mating system of the Cape mole-rat (Georychus capensis) family Bathyergidae

2017 ◽  
Vol 95 (10) ◽  
pp. 713-726 ◽  
Author(s):  
J.H. Visser ◽  
N.C. Bennett ◽  
B. Jansen van Vuuren
Keyword(s):  
Life History ◽  
Mating System ◽  
Vegetation Type ◽  
Ecological Factors ◽  
Disjunct Distribution ◽  
Testis Size ◽  
Extrinsic Factors ◽  
Mole Rat ◽  
Testicular Size ◽  
Life History Patterns

Interpopulation variation in life-history patterns are influenced by intrinsic and extrinsic factors. Life-history patterns have been intensely studied in the eusocial African bathyergid species, largely neglecting the solitary species. Of these solitary genera, the Cape mole-rat (Georychus capensis (Pallas, 1778)) is endemic to South Africa with a disjunct distribution across its range. Knowledge regarding this species is rudimentary; therefore, this study aimed to investigate the current distribution of the species with particular attention to common ecological variables, differences in body size between localities and sexes, as well as its reproduction and mating system. Georychus is a habitat specialist restricted to specific ecological areas. A lack of sexual size dimorphism and correlation between male testis size and number of females in the population, suggests a polygynous mating system, facilitated by the spatial distribution of the sexes. A positive relationship between male testes size and percentage of females in populations sampled suggests that larger sperm reserves (i.e., larger testes) are required in populations with a higher percentage of females. In addition, mating variables (testicular size and litter size) are linked to ecological factors (elevation, aridity, soil type, and vegetation type) that could impact mate searching, mating success, and food resources.

Fecundity of the Slimy Sculpin, Cottus cognatus, in Lake Michigan

Copeia ◽  
1976 ◽  
Vol 1976 (4) ◽  
pp. 802 ◽  
Author(s):  
Jeffrey W. Foltz
Keyword(s):  
Lake Michigan ◽  
Cottus Cognatus ◽  
Slimy Sculpin

Effects of un-ionized ammonia on histological, endocrine, and whole organism endpoints in slimy sculpin (Cottus cognatus)

2008 ◽  
Vol 90 (4) ◽  
pp. 300-309 ◽  
Author(s):  
P. Spencer ◽  
R. Pollock ◽  
M. Dubé
Keyword(s):  
Cottus Cognatus ◽  
Slimy Sculpin
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