期刊
ENVIRONMENTAL BIOLOGY OF FISHES
卷 86, 期 3, 页码 361-370出版社
SPRINGER
DOI: 10.1007/s10641-009-9534-z
关键词
Thermal physiology; Chamber respirometry; Common garden experiment; Population structure; Atlantic cod; Iceland
资金
- Marine Research Institute, Iceland
- University of Iceland Research Fund
- Icelandic Ministry of Fisheries and Agriculture
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 4.0A degrees C, 8.5A degrees C, and 12.6A degrees 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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