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Research Article
Diel cycling hypoxia enhances hypoxia tolerance in rainbow trout (Oncorhynchus mykiss): evidence of physiological and metabolic plasticity
Kenneth J. Williams, Alicia A. Cassidy, Christine E. Verhille, Simon G. Lamarre, Tyson J. MacCormack
Journal of Experimental Biology 2019 222: jeb206045 doi: 10.1242/jeb.206045 Published 23 July 2019
Kenneth J. Williams
1Department of Chemistry and Biochemistry, Mount Allison University, Sackville NB, Canada, E4L 1G8
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Alicia A. Cassidy
2Département de Biologie, Université de Moncton, Moncton, NB, Canada, E1A 3E9
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Christine E. Verhille
3Department of Ecology, Montana State University, Bozeman, MT 59717-3460, USA
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Simon G. Lamarre
2Département de Biologie, Université de Moncton, Moncton, NB, Canada, E1A 3E9
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Tyson J. MacCormack
1Department of Chemistry and Biochemistry, Mount Allison University, Sackville NB, Canada, E4L 1G8
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ABSTRACT

Many fish naturally encounter a daily cycle of hypoxia, but it is unclear whether this exposure hardens hypoxia-intolerant fish to future hypoxia or leads to accumulated stress and death. The rainbow trout (Oncorhynchus mykiss) is a putatively hypoxia-sensitive species found in rivers and estuaries that may routinely experience hypoxic events. Trout were exposed to one of four 135 h treatments in a swim-tunnel respirometer: (1) air-saturated control (20.7 kPa PO2); (2) diel cycling O2 (20.7–4.2 kPa PO2 over 24 h); (3) acute hypoxia (130 h at 20.7 kPa PO2 followed by 5 h at 4.2 kPa PO2); and (4) the mean oxygen tension (12.4 kPa PO2) experienced by the diel cycled fish. Some responses were similar in diel O2 cycled and mean PO2-treated fish, but overall, exposure to ecologically representative diel hypoxia cycles improved hypoxia tolerance. Diel hypoxia-induced protective responses included increased inducible HSP70 concentration and mean corpuscular hemoglobin concentration, as well as reduced plasma cortisol. Acclimation to diel hypoxia allowed metabolic rates to decline during hypoxia, reduced oxygen debt following subsequent exposures, and allowed fish to return to an anabolic phenotype. The data demonstrate that acute diel cycling hypoxia improves hypoxia tolerance in previously intolerant fish through the activation of cellular protective mechanisms and a reduction in metabolic O2 requirements.

FOOTNOTES

  • Competing interests

    The authors declare no competing or financial interests.

  • Author contributions

    Conceptualization: K.J.W., T.M.; Methodology: K.J.W., A.A.C., S.L., T.M.; Software: C.E.V.; Validation: K.J.W.; Formal analysis: K.J.W., C.E.V.; Investigation: K.J.W., A.A.C.; Resources: K.J.W., A.A.C., S.L., T.M.; Data curation: K.J.W.; Writing - original draft: K.J.W.; Writing - review & editing: K.J.W., A.A.C., C.E.V., S.L., T.M.; Visualization: K.J.W., T.M.; Supervision: S.L., T.M.; Project administration: S.L., T.M.; Funding acquisition: S.L., T.M.

  • Funding

    This study was funded by Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery grants to T.J.M. and S.G.L., and an NSERC undergraduate student research grant to K.J.W.

  • Received April 27, 2019.
  • Accepted June 28, 2019.
  • © 2019. Published by The Company of Biologists Ltd
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Keywords

  • Intermittent hypoxia
  • HSP70
  • Anabolism
  • Preconditioning
  • AMP-activated protein kinase

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Research Article
Diel cycling hypoxia enhances hypoxia tolerance in rainbow trout (Oncorhynchus mykiss): evidence of physiological and metabolic plasticity
Kenneth J. Williams, Alicia A. Cassidy, Christine E. Verhille, Simon G. Lamarre, Tyson J. MacCormack
Journal of Experimental Biology 2019 222: jeb206045 doi: 10.1242/jeb.206045 Published 23 July 2019
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Research Article
Diel cycling hypoxia enhances hypoxia tolerance in rainbow trout (Oncorhynchus mykiss): evidence of physiological and metabolic plasticity
Kenneth J. Williams, Alicia A. Cassidy, Christine E. Verhille, Simon G. Lamarre, Tyson J. MacCormack
Journal of Experimental Biology 2019 222: jeb206045 doi: 10.1242/jeb.206045 Published 23 July 2019

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