Negligible differences in metabolism and thermal tolerance between diploid and triploid Atlantic salmon ( Salmo salar ).

Autor: Bowden AJ; Institute of Marine and Antarctic Studies, University of Tasmania, Hobart, Tasmania 7000, Australia alyssa_bowden@outlook.com.; CSIRO Agriculture and Food, Hobart, Tasmania 7000, Australia., Andrewartha SJ; CSIRO Agriculture and Food, Hobart, Tasmania 7000, Australia., Elliott NG; Institute of Marine and Antarctic Studies, University of Tasmania, Hobart, Tasmania 7000, Australia.; CSIRO Agriculture and Food, Hobart, Tasmania 7000, Australia., Frappell PB; Institute of Marine and Antarctic Studies, University of Tasmania, Hobart, Tasmania 7000, Australia., Clark TD; Institute of Marine and Antarctic Studies, University of Tasmania, Hobart, Tasmania 7000, Australia.; CSIRO Agriculture and Food, Hobart, Tasmania 7000, Australia.; Deakin University, School of Life and Environmental Sciences, Geelong, Victoria 3216, Australia.
Jazyk: angličtina
Zdroj: The Journal of experimental biology [J Exp Biol] 2018 Mar 13; Vol. 221 (Pt 5). Date of Electronic Publication: 2018 Mar 13.
DOI: 10.1242/jeb.166975
Abstrakt: The mechanisms that underlie thermal tolerance in aquatic ectotherms remain unresolved. Triploid fish have been reported to exhibit lower thermal tolerance than diploids, offering a potential model organism to better understand the physiological drivers of thermal tolerance. Here, we compared triploid and diploid juvenile Atlantic salmon ( Salmo salar ) in freshwater to investigate the proposed link between aerobic capacity and thermal tolerance. We measured specific growth rates (SGR) and resting (aerobic) metabolic rates (RMR) in freshwater at 3, 7 and 9 weeks of acclimation to 10, 14 and 18°C. Additionally, maximum metabolic rates (MMR) were measured at 3 and 7 weeks of acclimation, and critical thermal maxima (CT max ) were measured at 9 weeks. Mass, SGR and RMR differed between ploidies across all temperatures at the beginning of the acclimation period, but all three metrics were similar across ploidies by week 7. Aerobic scope (MMR-RMR) remained consistent across ploidies, acclimation temperatures and time. At 9 weeks, CT max was independent of ploidy, but correlated positively with acclimation temperature despite the similar aerobic scope between acclimation groups. Our findings suggest that acute thermal tolerance is not modulated by aerobic scope, and the altered genome of triploid Atlantic salmon does not translate to reduced thermal tolerance of juvenile fish in freshwater.
Competing Interests: Competing interestsThe authors declare no competing or financial interests.
(© 2018. Published by The Company of Biologists Ltd.)
Databáze: MEDLINE
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