Cardiorespiratory collapse at high temperature in swimming adult sockeye salmon

Eliason, Erika J., Clark, Timothy D., Hinch, Scott G. and Farrell, Anthony P. 2013, Cardiorespiratory collapse at high temperature in swimming adult sockeye salmon, Conservation physiology, vol. 1, no. 1, pp. 1-19, doi: 10.1093/conphys/cot008.

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Title Cardiorespiratory collapse at high temperature in swimming adult sockeye salmon
Author(s) Eliason, Erika J.
Clark, Timothy D.ORCID iD for Clark, Timothy D.
Hinch, Scott G.
Farrell, Anthony P.
Journal name Conservation physiology
Volume number 1
Issue number 1
Start page 1
End page 19
Total pages 19
Publisher Oxford University Press
Place of publication Oxford, Eng.
Publication date 2013
ISSN 2051-1434
Keyword(s) Aerobic scope
climate change
heart rate
oxygen- and capacity-limited thermal tolerance
Science & Technology
Life Sciences & Biomedicine
Biodiversity Conservation
Environmental Sciences
Biodiversity & Conservation
Environmental Sciences & Ecology
Summary Elevated summer river temperatures are associated with high in-river mortality in adult sockeye salmon (Oncorhynchus nerka) during their once-in-a-lifetime spawning migration up the Fraser River (British Columbia, Canada). However, the mechanisms underlying the decrease in whole-animal performance and cardiorespiratory collapse above optimal temperatures for aerobic scope (T opt) remain elusive for aquatic ectotherms. This is in part because all the relevant cardiorespiratory variables have rarely been measured directly and simultaneously during exercise at supra-optimal temperatures. Using the oxygen- and capacity-limited thermal tolerance hypothesis as a framework, this study simultaneously and directly measured oxygen consumption rate (MO2), cardiac output [Formula: see text], heart rate (f H), and cardiac stroke volume (V s), as well as arterial and venous blood oxygen status in adult sockeye salmon swimming at temperatures that bracketed T opt to elucidate possible limitations in oxygen uptake into the blood or internal delivery through the oxygen cascade. Above T opt, the decline in MO2max and aerobic scope was best explained by a cardiac limitation, triggered by reduced scope for f H. The highest test temperatures were characterized by a negative scope for f H, dramatic decreases in maximal [Formula: see text] and maximal V s, and cardiac dysrhythmias. In contrast, arterial blood oxygen content and partial pressure were almost insensitive to supra-optimal temperature, suggesting that oxygen delivery to and uptake by the gill were not a limiting factor. We propose that the high-temperature-induced en route mortality in migrating sockeye salmon may be at least partly attributed to physiological limitations in aerobic performance due to cardiac collapse via insufficient scope for f H. Furthermore, this improved mechanistic understanding of cardiorespiratory collapse at high temperature is likely to have broader application to other salmonids and perhaps other aquatic ectotherms.
Language eng
DOI 10.1093/conphys/cot008
Field of Research 070499 Fisheries Sciences not elsewhere classified
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2013, The Author
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