Population variation in thermal growth responses of juvenile Atlantic cod (<Emphasis Type="Italic">Gadus morhua</Emphasis> L.) |
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Authors: | Marion Harrald Francis C Neat Peter J Wright Robert J Fryer Felicity A Huntingford |
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Institution: | (1) Marine Scotland, Marine Laboratory, P.O. Box 101, 375 Victoria Road, Aberdeen, AB11 9DB, UK;(2) Division of Ecology and Evolutionary Biology, University of Glasgow, Glasgow, G12 8QQ, UK |
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Abstract: | Controlled environment experiments were carried out to investigate thermal influences and population differences on growth
of wild-caught juvenile Atlantic cod Gadus morhua L. from two regions of differing thermal regime off Scotland; the Clyde Sea on the west coast and St Andrews Bay on the east
coast. Cod from the Clyde demonstrated significantly higher growth rates than cod from St Andrews. In both populations the
growth rate was greater at 12°C than at 8°C. These population and temperature effects act to reinforce one another and it
could therefore be predicted that the growth differences between the two areas in the wild should be even more pronounced.
The results are consistent with the suggestion that cod may be locally adapted to their thermal environment. |
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