Temperature preference in two populations of juvenile coho salmon,oncorhynchus kisutch |
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Authors: | John T. Konecki Carol A. Woody Thomas P. Quinn |
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Affiliation: | (1) School of Fisheries WH-10, University of Washington, Seattle, WA 98195, USA |
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Abstract: | Synopsis Two groups of coho salmon,Oncorhynchus kisutch, were raised under identical regimes to test the hypothesis that the group from a stream with lower and less variable temperatures would have a lower and less variable preferred temperature than would the group from a stream with warmer and more variable temperatures. The preferred (modal) temperatures in an electronic shuttlebox of coho salmon young from a relatively cool, groundwater-fed stream were slightly lower and less variable than those of young from a warmer and more heterothermal stream (mean = 9.6° C, range: 6–16° C vs. mean = 11.6° C, range: 7–21° C). However, there was a great deal of variation within and among individual fish. While some genetic variation in thermal preference may exist, the species seems best characterized as tolerant of relatively large temperature fluctuations. |
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Keywords: | Shuttlebox Behavioral thermoregulation Salmonids |
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