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Experimental Biology Online

, Volume 6, Issue 1, pp 1–8 | Cite as

Constancy and control of heart rate during an increase in temperature in the Antarctic fish Pagothenia borchgrevinki

  • Craig E. Franklin
  • Michael Axelsson
  • William Davison
Original articles

Abstract

The effect of an acute temperature increase on the control of the heart of the Antarctic teleost Pagothenia borchgrevinki was examined. Heart rate was thermally independent over the range −1.2°C to 3°C, although increasing the temperature from −1.2°C to 3°C elicited a decrease in ventral aortic pressure. Administration of the muscarinic receptor antagonist atropine and the β-adrenoreceptor antagonist sotalol abolished the thermal independence of heart rate, with heart rate increasing at Q10=2. As temperature was increased from −1.2°C to 3°C, cholinergic tone on the heart also increased, from 44.6±4.2% to 70.0±8.4%. At the same time the adrenergic tone increased from 35.5±3.3% to 43.0±3.1%, but the effect on the heart was masked by the increase of cholinergic tone, leading to the thermal independence of heart rate.

Key words

Adrenergic Antarctic Cardiac Cholinergic Fish Heart Stenothermy Thermal 

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Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  • Craig E. Franklin
    • 1
  • Michael Axelsson
    • 2
  • William Davison
    • 3
  1. 1.Department of Zoology and EntomologyThe University of QueenslandBrisbaneAustralia
  2. 2.Department of ZoologyUniversity of GöteborgGöteborgSweden
  3. 3.Department of ZoologyUniversity of CanterburyChristchurchNew Zealand

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