Physiological tradeoffs may underlie the evolution of hypoxia tolerance and exercise performance in sunfish (Centrarchidae)

The Journal of Experimental Biology
Kyle D CransGraham R Scott

Abstract

Tradeoffs between hypoxia tolerance and aerobic exercise performance appear to exist in some fish taxa, even though both of these traits are often associated with a high O2 transport capacity. We examined the physiological basis for this potential tradeoff in four species of sunfish from the family Centrarchidae. Hypoxia tolerance was greatest in rock bass, intermediate in pumpkinseed and bluegill and lowest in largemouth bass, based on measurements of critical O2 tension (Pcrit) and O2 tension at loss of equilibrium (PO2 at LOE). Consistent with there being a tradeoff between hypoxia tolerance and aerobic exercise capacity, the least hypoxia-tolerant species had the highest critical swimming speed (Ucrit) during normoxia and suffered the greatest decrease in Ucrit in hypoxia. There was also a positive correlation between Ucrit in normoxia and PO2 at LOE, which remained significant after accounting for phylogeny using phylogenetically independent contrasts. Several sub-organismal traits appeared to contribute to both hypoxia tolerance and aerobic exercise capacity (reflected by traits that were highest in both rock bass and largemouth bass), such as the gas-exchange surface area of the gills, the pH sensitivity of haemoglobin-O...Continue Reading

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Citations

Apr 18, 2016·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Brittney G BorowiecGraham R Scott
Jul 28, 2016·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Graham R ScottAdalberto L Val
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Nov 18, 2018·The Journal of Experimental Biology·Tessa S BlanchardPatricia A Wright
Jan 29, 2020·The Journal of Experimental Biology·Brittney G BorowiecGraham R Scott
Feb 27, 2020·The Journal of Experimental Biology·Krista Kraskura, Jay A Nelson
Nov 14, 2018·The Journal of Experimental Biology·Chris M Wood
Nov 7, 2019·Conservation Physiology·Bryan D FrenetteKeith B Gido
Nov 15, 2019·The Journal of Experimental Biology·Gordon R Ultsch, Matthew D Regan
Nov 2, 2018·The Journal of Experimental Biology·Milica Mandic, Matthew D Regan
Jul 14, 2019·Fish Physiology and Biochemistry·Michael J LawrenceSteven J Cooke
Feb 5, 2021·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Carine de Freitas SouzaAdalberto Luis Val
Sep 16, 2021·The Journal of Experimental Biology·Brad SeibelChristina Welsh

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