Abstract
Upon reaching sexual maturity, several species of male salmonids possess a relative ventricular mass (rMV) that may be up to 90% larger than females. This can increase maximum cardiac stroke volume and power output, which may be beneficial to increasing the oxygen transport capacity of male salmonids during the spawning period. It may be further hypothesized, therefore, that other variables within the circulatory oxygen transport cascade, such as blood oxygen-carrying capacity and heart rate, are similarly enhanced in reproductively mature male salmonids. To test this idea, the present study measured a range of circulatory oxygen transport variables in wild male and female sockeye salmon (Oncorhynchus nerka) during their spawning period, following a 150 km migration from the ocean. The rMV of male fish was 13% greater than females. Conversely, the haemoglobin concentration ([Hb]) of female fish was 19% higher than males, indicative of a greater blood oxygen-carrying capacity (138 vs. 116 ml O2 l−1, respectively). Surgically implanted physiological data loggers revealed a similar range in heart rate for both sexes on the spawning ground (20–80 beats min−1 at 10°C), with a tendency for male fish to spend a greater percentage of time (64%) than females (49%) at heart rates above 50 beats min−1. Male fish on average consumed significantly more oxygen than females during a 13-h respirometry period. However, routine oxygen consumption rates \( (\dot{M}{\text{O}}_{2} ) \) ranged between 1.5 and 8.5 mg min−1 kg−1 for both sexes, which implies that males did not inherently possess markedly higher routine aerobic energy demands, and suggests that the higher [Hb] of female fish may compensate for the smaller rMV. These findings reject the hypothesis that all aspects of the circulatory oxygen transport cascade are inherently superior in male sockeye salmon. Instead, it is suggested that any differences in \( \dot{M}{\text{O}}_{2} \) between sexually mature male and female sockeye salmon can likely be attributed to activity levels.
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Acknowledgments
We thank the staff of Weaver Creek spawning channel, particularly Rick Stitt, Wayne Charlie and Heather East, for their hospitality and assistance, and we are grateful to Georgina Cox, Erika Eliason, Ken Jeffries and Andrew Lotto for their assistance during data logger implantation and observations of tagged fish. TDC was supported by a Killam Postdoctoral Fellowship. APF and SGH were supported by funding through NSERC Canada. All experimental procedures were approved by the Animal Care Committee of the University of British Columbia in accordance with the Canadian Council on Animal Care.
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Communicated by I. D. Hume.
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Clark, T.D., Hinch, S.G., Taylor, B.D. et al. Sex differences in circulatory oxygen transport parameters of sockeye salmon (Oncorhynchus nerka) on the spawning ground. J Comp Physiol B 179, 663–671 (2009). https://doi.org/10.1007/s00360-009-0349-1
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DOI: https://doi.org/10.1007/s00360-009-0349-1