A1 Refereed original research article in a scientific journal

Variation in temperature tolerance among families of atlantic salmon (Salmo salar) is associated with hypoxia tolerance, ventricle size and myoglobin level




AuthorsAnttila K, Dhillon R, Boulding E, Farrell A, Glebe B, Elliott J, Wolters W, Schulte P

Publication year2013

JournalJournal of Experimental Biology

Journal name in sourceJournal of Experimental Biology

Number in series7

Volume216

Issue7

First page 1183

Last page1190

Number of pages8

ISSN0022-0949

DOIhttps://doi.org/10.1242/jeb.080556

Web address http://api.elsevier.com/content/abstract/scopus_id:84876131109


Abstract
In fishes, performance failure at high temperature is thought to be due to a limitation on oxygen delivery (the theory of oxygen and capacity limited thermal tolerance, OCLTT), which suggests that thermal tolerance and hypoxia tolerance might be functionally associated. Here we examined variation in temperature and hypoxia tolerance among 41 families of Atlantic salmon (Salmo salar), which allowed us to evaluate the association between these two traits. Both temperature and hypoxia tolerance varied significantly among families and there was a significant positive correlation between critical maximum temperature (CT) and hypoxia tolerance, supporting the OCLTT concept. At the organ and cellular levels, we also discovered support for the OCLTT concept as relative ventricle mass (RVM) and cardiac myoglobin (Mb) levels both correlated positively with CT (R=0.21, P<0.001 and R=0.17, P=0.003, respectively). A large RVM has previously been shown to be associated with high cardiac output, which might facilitate tissue oxygen supply during elevated oxygen demand at high temperatures, while Mb facilitates the oxygen transfer from the blood to tissues, especially during hypoxia. The data presented here demonstrate for the first time that RVM and Mb are correlated with increased upper temperature tolerance in fish. High phenotypic variation between families and greater similarity among full- and half-siblings suggests that there is substantial standing genetic variation in thermal and hypoxia tolerance, which could respond to selection either in aquaculture or in response to anthropogenic stressors such as global climate change. © 2013. Published by The Company of Biologists Ltd.



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