Evidence of phenotypic plasticity and local adaption in metabolic rates between components of the Icelandic cod (Gadus morhua L.) stock |
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Authors: | Timothy B. Grabowski Shawn P. Young Lísa A. Libungan Agnar Steinarsson Guðrún Marteinsdóttir |
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Affiliation: | 1. Institute of Biology, University of Iceland, Askja, Sturlugata 7, Is-101, Reykjavik, Iceland 2. Department of Fish and Wildlife Resources, University of Idaho, Moscow, ID, 83844-1136, USA 3. Marine Research Laboratory, Marine Research Institute, Is-240, Grindavík, Iceland
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Abstract: | Phenotypic plasticity and local adaptations are important considerations in delineating population structure of marine fishes and critical to their conservation and management. We compared the weight-specific oxygen consumption rates (VO2/M) of juvenile cod from the northern and southern components of the Icelandic stock acclimated to 4.0°C, 8.5°C, and 12.6°C and their metabolic response to abrupt temperatures changes within this range. Southern individuals exhibited VO2/M up to 50% higher than their northern counterparts when tested at their acclimation temperature. However, northern fish generally experienced greater changes in VO2/M, three to six-fold increases, relative to that expected at acclimation when moved to higher temperatures. Southern cod showed a greater decrease in VO2/M when exposed to lower temperatures. Our results indicate physiological differences exist between the northern and southern components of the Icelandic cod stock and warrant considering them as two distinct populations. |
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