Critical thermal minima and maxima of three freshwater game-fish species acclimated to constant temperatures |
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Authors: | Rebecca J Currie Wayne A Bennett Thomas L Beitinger |
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Institution: | (1) Department of Biological Sciences, University of North Texas, P.O. Box 5218, Denton, TX, 76203, U.S.A.;(2) Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061, U.S.A;(3) Department of Biology, University of West Florida, 11000 University Parkway, Pensacola, FL, 32514, U.S.A |
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Abstract: | A total of 120 critical thermal maxima (CT maxima) and 120 critical thermal minima (CT minima) were determined for channel
catfish, largemouth bass and rainbow trout acclimated to three constant temperatures: 20, 25 and 30 °C in catfish and bass,
and 10, 15 and 20 °C in trout. Highest mean CT maximum and lowest mean CT minimum measured over these acclimation temperatures
were 40.3 and 2.7 °C (catfish), 38.5 and 3.2 °C (bass) and 29.8 and ∼ 0.0 °C (trout). Temperature tolerance data were precise
with standard deviations generally less than 0.5 °C. Channel catfish had the largest thermal tolerance scope of the three
species while rainbow trout had the lowest tolerance of high temperatures and the highest tolerance of low temperatures. In
all species CT minima and CT maxima were highly significantly linearly related to acclimation temperature. Within each species,
slopes relating CT maxima to acclimation temperature were approximately half as large as those relating CT minima to acclimation
temperature, suggesting that acclimation temperature has a greater influence on tolerance to low rather than high temperatures.
Slopes relating both CT minima and CT maxima to acclimation temperature for the two warm-water species were similar and approximately
twice those for the rainbow trout.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | temperature tolerance largemouth bass channel catfish rainbow trout |
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