Niche expansion of the shorthorn sculpin (Myoxocephalus scorpius) to Arctic waters is supported by a thermal independence of cardiac performance at low temperature

Farrell, A. P., Altimiras, J., Franklin, C. E. and Axelsson, M. (2013) Niche expansion of the shorthorn sculpin (Myoxocephalus scorpius) to Arctic waters is supported by a thermal independence of cardiac performance at low temperature. Canadian Journal of Zoology, 91 8: 573-580. doi:10.1139/cjz-2013-0038


Author Farrell, A. P.
Altimiras, J.
Franklin, C. E.
Axelsson, M.
Title Niche expansion of the shorthorn sculpin (Myoxocephalus scorpius) to Arctic waters is supported by a thermal independence of cardiac performance at low temperature
Journal name Canadian Journal of Zoology   Check publisher's open access policy
ISSN 0008-4301
1480-3283
Publication date 2013-08-01
Year available 2013
Sub-type Article (original research)
DOI 10.1139/cjz-2013-0038
Volume 91
Issue 8
Start page 573
End page 580
Total pages 8
Place of publication Ottawa, ON Canada
Publisher N R C Research Press
Collection year 2014
Language eng
Formatted abstract
Cardiovascular adaptations that permit successful exploitation of polar marine waters by fish requires a capacity to negate or compensate for the depressive effects of low temperatures on physiological processes. Here, we examined the effects of acute and chronic temperature change on the maximum cardiac performance of shorthorn sculpin (Myoxocephalus scorpius (L., 1758)) captured above the Arctic Circle. Our aim was to establish if the sculpin's success at low temperatures was achieved through thermal independence of cardiac function or via thermal compensation as a result of acclimation. Maximum cardiac performance was assessed at both 1 and 6 °C with a working perfused heart preparation that was obtained after fish had been acclimated to either 1 or 6 °C. Thus, tests were performed at the fish's acclimation temperature and with an acute temperature change. Maximum cardiac output, which was relatively large (>50 mL-min-1-kg-1 body mass) for abenthic fish at a frigid temperature, was found to be independent of both acclimation temperature and test temperature. While maximum p-adrenergic stimulation produced positive chronotropy at both acclimation temperatures, inotropic effects were weak or absent. We conclude that thermal independence of cardiac performance at low temperature likely facilitated the exploitation of polar waters by the shorthorn sculpin.
Keyword Myoxocephalus scorpius
Perfused heart
Cardiac Output
Adrenaline
Power generation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
School of Biological Sciences Publications
 
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