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Thermal growth performance of juvenile brown trout Salmo trutta: no support for thermal adaptation hypotheses

Authors

  • T. Forseth,

    1. * Norwegian Institute for Nature Research, NO-7485 Trondheim, Norway, Department of Aquaculture, Swedish University of Agricultural Sciences, Umeå, Sweden, § Norwegian Institute for Nature Research, Gaustadalléen 21, NO-0349 Oslo, Norway and National Board of Fisheries, Fisheries Experimental Station, SE-840 64 Kälarne, Sweden
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  • S. Larsson,

    Corresponding author
    1. * Norwegian Institute for Nature Research, NO-7485 Trondheim, Norway, Department of Aquaculture, Swedish University of Agricultural Sciences, Umeå, Sweden, § Norwegian Institute for Nature Research, Gaustadalléen 21, NO-0349 Oslo, Norway and National Board of Fisheries, Fisheries Experimental Station, SE-840 64 Kälarne, Sweden
      ‡Author to whom correspondence should be addressed at present address: Umeå Marine Sciences Centre, Norrbyn, SE-910 20 Hörnefors, Sweden. Tel.: +46 90 786 79 87; fax: +46 90 786 79 95; email: stefan.larsson@emg.umu.se
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  • A. J. Jensen,

    1. * Norwegian Institute for Nature Research, NO-7485 Trondheim, Norway, Department of Aquaculture, Swedish University of Agricultural Sciences, Umeå, Sweden, § Norwegian Institute for Nature Research, Gaustadalléen 21, NO-0349 Oslo, Norway and National Board of Fisheries, Fisheries Experimental Station, SE-840 64 Kälarne, Sweden
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  • B. Jonsson,

    1. * Norwegian Institute for Nature Research, NO-7485 Trondheim, Norway, Department of Aquaculture, Swedish University of Agricultural Sciences, Umeå, Sweden, § Norwegian Institute for Nature Research, Gaustadalléen 21, NO-0349 Oslo, Norway and National Board of Fisheries, Fisheries Experimental Station, SE-840 64 Kälarne, Sweden
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  • I. Näslund,

    1. * Norwegian Institute for Nature Research, NO-7485 Trondheim, Norway, Department of Aquaculture, Swedish University of Agricultural Sciences, Umeå, Sweden, § Norwegian Institute for Nature Research, Gaustadalléen 21, NO-0349 Oslo, Norway and National Board of Fisheries, Fisheries Experimental Station, SE-840 64 Kälarne, Sweden
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  • I. Berglund

    1. * Norwegian Institute for Nature Research, NO-7485 Trondheim, Norway, Department of Aquaculture, Swedish University of Agricultural Sciences, Umeå, Sweden, § Norwegian Institute for Nature Research, Gaustadalléen 21, NO-0349 Oslo, Norway and National Board of Fisheries, Fisheries Experimental Station, SE-840 64 Kälarne, Sweden
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    • Present address: National Board of Fisheries, Box 423, SE-401 26 Göteborg, Sweden.


‡Author to whom correspondence should be addressed at present address: Umeå Marine Sciences Centre, Norrbyn, SE-910 20 Hörnefors, Sweden. Tel.: +46 90 786 79 87; fax: +46 90 786 79 95; email: stefan.larsson@emg.umu.se

Abstract

Using thermal growth data from eight populations of anadromous and lake-feeding brown trout Salmo trutta, hypotheses of adaptation to local optima and countergradient variation in growth were tested. The adaptation to local optima hypothesis suggests that natural selection can shift optimal performance temperatures to match the prevailing temperature in a new or changed thermal niche. In contradiction, the countergradient variation hypothesis suggests that populations from hostile environments perform better than conspecifics from benign environments at all temperatures. In this study, growth capacity varied between populations but there was no significant correlation between any of the estimated thermal performance parameters (e.g. lower and upper thermal growth limits, optimal temperature for growth and maximum growth capacity) and natural climatic conditions among populations. Hence, S. trutta growth response to temperature lends no support for either of the two suggested thermal adaptation hypotheses. Instead, growth capacity among populations tended to correlate positively with female size at maturity.

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