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

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

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.

Larsson, StefanUmeå universitet,Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för vattenbruk,Department of Aquaculture,Institutionen för ekologi, miljö och geovetenskap(Swepub:umu)stla0003 (author)
Jensen, Arne J. (author)
Jonsson, Bror,1948-Norsk institutt for naturforskning (NINA),Naturresurs Rinnande Vatten(Swepub:kau)brorjons (author)
Naslund, Ingemar (author)
Berglund, IngemarSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för vattenbruk,Department of Aquaculture (author)
Sveriges lantbruksuniversitetInstitutionen för vattenbruk (creator_code:org_t)
Sveriges lantbruksuniversitet

By the author/editor: Forseth, Torbjör ...; Larsson, Stefan; Jensen, Arne J.; Jonsson, Bror, 1 ...; Naslund, Ingemar; Berglund, Ingema ...

About the subject

AGRICULTURAL SCIENCES: AGRICULTURAL SCI ...; and Agriculture Fore ...; and Fish and Aquacul ...

By the university: Karlstad University; Swedish University of Agricultural Sciences; Umeå University

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