The effects of acute changes in temperature and oxygen availability on cardiac performance in winter flounder (Pseudopleuronectes americanus)

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
Paula C Mendonça, A K Gamperl

Abstract

Studies on how flatfish cardiovascular function responds to environmental challenges are limited, and have largely relied upon indirect methodologies (i.e. Fick principle). Thus, we measured dorsal aortic blood pressure (P(DA)) and cardiac function in 8 and 15 degrees C-acclimated flounder exposed to graded hypoxia, and in 8 degrees C-acclimated fish exposed to an acute temperature increase to their critical thermal maximum (CTM). The extent of bradycardia in 8 degrees C-acclimated fish (decrease in heart rate of 41%) was consistent with that observed for other teleosts, as was this species' CTM (25.8+/-0.5 degrees C) and its cardiac response to increasing temperature. However, this study provides further examples of how cardiovascular function is controlled differently in the flounder as compared with other fishes. First, the onset of bradycardia in 8 degrees C-acclimated fish occurred earlier than expected for this inactive and hypoxia-tolerant species (60% water air saturation). Second, resting cardiac output was similar in flounder acclimated to 8 and 15 degrees C (approximately 15 mL min(-1) kg(-1)), and hypoxic bradycardia was surprisingly absent at 15 degrees C. Finally, systemic vascular resistance decreased when flound...Continue Reading

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Citations

Feb 26, 2013·Physiological and Biochemical Zoology : PBZ·Katja AnttilaAnthony P Farrell
May 24, 2011·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·L H PetersenD B Huggett
Apr 3, 2014·Journal of Fish Biology·R SidhuA P Farrell
Jun 10, 2016·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Andreas EkströmErik Sandblom
Nov 18, 2016·The Journal of Experimental Biology·Andreas EkströmNicolas Pichaud
Jul 8, 2016·The Journal of Experimental Biology·Matti Vornanen
Jan 1, 2013·Conservation Physiology·Erika J EliasonAnthony P Farrell
Sep 28, 2020·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Matti Vornanen
Nov 11, 2019·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Andreas EkströmErik Sandblom
Feb 24, 2021·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Dane A CrossleyMartin Grosell
Jan 8, 2022·Acta Physiologica·William Joyce, Tobias Wang

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