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Thermal dependence of cardiac function in arctic fish: implications of a warming world

Artikel i vetenskaplig tidskrift
Författare C. E. Franklin
A. P. Farrell
J. Altimiras
Michael Axelsson
Publicerad i Journal of Experimental Biology
Volym 216
Nummer/häfte 22
Sidor 4251-4255
ISSN 0022-0949
Publiceringsår 2013
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 4251-4255
Språk en
Länkar dx.doi.org/10.1242/jeb.087130
Ämnesord cardiovascular, scope, temperature, conservation physiology, RECENT CLIMATE-CHANGE, MARINE FISHES, TEMPERATURES, POPULATIONS, PERFORMANCE, INCREASES, RESPONSES
Ämneskategorier Biologiska vetenskaper

Sammanfattning

With the Arctic experiencing one of the greatest and most rapid increases in sea temperatures in modern time, predicting how Arctic marine organisms will respond to elevated temperatures has become crucial for conservation biology. Here, we examined the thermal sensitivity of cardiorespiratory performance for three closely related species of sculpins that inhabit the Arctic waters, two of which, Gymnocanthus tricuspis and Myoxocephalus scorpioides, have adapted to a restricted range within the Arctic, whereas the third species, Myoxocephalus scorpius, has a wider distribution. We tested the hypothesis that the fish restricted to Arctic cold waters would show reduced cardiorespiratory scope in response to an increase in temperature, as compared with the more eurythermal M. scorpius. As expected from their biogeography, M. scorpioides and G. tricuspis maximised cardiorespiratory performance at temperatures between 1 and 4 degrees C, whereas M. scorpius maximised performance over a wider range of temperatures (1-10 degrees C). Furthermore, factorial scope for cardiac output collapsed at elevated temperature for the two high-latitude species, negatively impacting their ability to support aerobically driven metabolic processes. Consequently, these results concurred with our hypothesis, suggesting that the sculpin species restricted to the Arctic are likely to be negatively impacted by increases in ocean temperatures.

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