1365-2435/asset/cover.gif?v=1&s=571713c051a4c9b4843f1aa4a484de7ca8661854 "Functional Ecology")
Author to whom correspondence should be addressed. E-mail: bror.jonsson@ninaosl.ninaniku.no
1365-2435/asset/olbannerleft.gif?v=1&s=c8b848a8f001fdfa90240fe2ab26b1f04b6fe8e4)
1365-2435/asset/olbannerright.gif?v=1&s=2cf6e00d281371851f86902da3937ac5884bcfe0)
You have full text access to this OnlineOpen article
Thermal performance of juvenile Atlantic Salmon, Salmo salar L.
Article first published online: 20 DEC 2001
DOI: 10.1046/j.0269-8463.2001.00572.x
Additional Information
How to Cite
JONSSON, B., FORSETH, T., JENSEN, A. J. and NÆSJE, T. F. (2001), Thermal performance of juvenile Atlantic Salmon, Salmo salar L.Functional Ecology, 15: 701–711. doi: 10.1046/j.0269-8463.2001.00572.x
Publication History
- Issue published online: 20 DEC 2001
- Article first published online: 20 DEC 2001
- Received 16 November 2000; revised 30 April 2001; accepted 29 May 2001
- Abstract
- Article
- References
- Cited By
Keywords:
- Food consumption;
- growth;
- growth efficiency;
- optimal temperature;
- thermal adaptation
Summary
- 1Experimental data for maximum growth and food consumption of Atlantic Salmon (Salmo salar L.) parr from five Norwegian rivers situated between 59 and 70°N were analysed and modelled. The growth and feeding models were also applied to groups of Atlantic Salmon growing and feeding at rates below the maximum. The data were fitted to the Ratkowsky model, originally developed for bacterial growth.
- 2The rates of growth and food consumption varied significantly among populations but the variation appeared unrelated to thermal conditions in the river of population origins. No correlation was found between the thermal conditions and limits for growth, thermal growth optima or maximum growth, and hypotheses of population-specific thermal adaptation were not supported. Estimated optimum temperatures for growth were between 16 and 20 °C.
- 3Model parameter estimates differed among growth-groups in that maximum growth and the performance breadth decreased from fast to slow growing individuals. The optimum temperature for growth did not change with growth rate.
- 4The model for food consumption (expressed in energy terms) peaked at 19–21 °C, which is only slightly higher than the optimal temperature for growth. Growth appeared directly related to food consumption. Consumption was initiated ≈2 °C below the lower temperature for growth and terminated ≈1·5 °C above the upper critical temperature for growth. Model parameter estimates for consumption differed among growth-groups in a manner similar to the growth models.
- 5By combining the growth and consumption models, growth efficiencies were estimated. The maximum efficiencies were high, 42–58%, and higher in rivers offering hostile than benign feeding and growth opportunities.