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

Artikel i vetenskaplig tidskrift
Författare A. P. Farrell
J. Altimiras
C. E. Franklin
Michael Axelsson
Publicerad i Canadian Journal of Zoology-Revue Canadienne De Zoologie
Volym 91
Nummer/häfte 8
Sidor 573-580
ISSN 0008-4301
Publiceringsår 2013
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 573-580
Språk en
Länkar dx.doi.org/10.1139/cjz-2013-0038
Ämnesord Myoxocephalus scorpius, perfused heart, cardiac output, adrenaline, power generation, pressure, TROUT ONCORHYNCHUS-MYKISS, COD GADUS-MORHUA, FLOUNDER, PLEURONECTES-AMERICANUS, RAINBOW-TROUT, WINTER FLOUNDER, SALMO-GAIRDNERI, CARDIOVASCULAR-RESPONSES, ADRENERGIC SENSITIVITY, DIFFERENT ENVIRONMENTS, EXTRACELLULAR CALCIUM, LLIGAN CL, 1989, JOURNAL OF FISH BIOLOGY, V35, P229
Ämneskategorier Zoologi

Sammanfattning

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 degrees C with a working perfused heart preparation that was obtained after fish had been acclimated to either 1 or 6 degrees 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 a benthic fish at a frigid temperature, was found to be independent of both acclimation temperature and test temperature. While maximum beta-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.

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