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Sex and proximity to reproductive maturity influence the survival, final maturation, and blood physiology of Pacific salmon when exposed to high temperature during a simulated migration

Jeffries, Ken M., Hinch, Scott G., Martins, Eduardo G., Clark, Timothy D., Lotto, Andrew G., Patterson, David A., Cooke, Steven J., Farrell, Anthony P. and Miller, Kristina M. 2012, Sex and proximity to reproductive maturity influence the survival, final maturation, and blood physiology of Pacific salmon when exposed to high temperature during a simulated migration, Physiological and biochemical zoology, vol. 85, no. 1, pp. 62-73, doi: 10.1086/663770.

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Title Sex and proximity to reproductive maturity influence the survival, final maturation, and blood physiology of Pacific salmon when exposed to high temperature during a simulated migration
Author(s) Jeffries, Ken M.
Hinch, Scott G.
Martins, Eduardo G.
Clark, Timothy D.
Lotto, Andrew G.
Patterson, David A.
Cooke, Steven J.
Farrell, Anthony P.
Miller, Kristina M.
Journal name Physiological and biochemical zoology
Volume number 85
Issue number 1
Start page 62
End page 73
Total pages 12
Publisher University of Chigaco Press
Place of publication Chicago, Ill.
Publication date 2012-01
ISSN 1537-5293
Keyword(s) Adaptation, Physiological
Animal Migration
Animals
Blood Glucose
Chlorides
Estradiol
Female
Hydrocortisone
Lactates
Male
Rivers
Salmon
Sex Factors
Sexual Maturation
Survival Analysis
Testosterone
Summary Some Pacific salmon populations have been experiencing increasingly warmer river temperatures during their once-in-a-lifetime spawning migration, which has been associated with en route and prespawn mortality. The mechanisms underlying such temperature-mediated mortality are poorly understood. Wild adult pink (Oncorhynchus gorbuscha) and sockeye (Oncorhynchus nerka) salmon were used in this study. The objectives were to investigate the effects of elevated water temperature on mortality, final maturation, and blood properties under controlled conditions that simulated a "cool" (13°C) and "warm" (19°C) freshwater spawning migration. After 10 d at 13°C, observed mortality was 50%-80% in all groups, which suggested that there was likely some mortality associated with handling and confinement. Observed mortality after 10 d at 19°C was higher, reaching ≥98% in male pink salmon and female pink and sockeye salmon. Thus, male sockeye salmon were the most thermally tolerant (54% observed mortality). Model selection supported the temperature- and sex-specific mortality patterns. The pink salmon were closer to reproductive maturation and farther along the senescence trajectory than sockeye salmon, which likely influenced their survival and physiological responses throughout the experiment. Females of both species held at 19°C had reduced plasma sex steroids compared with those held at 13°C, and female pink salmon were less likely to become fully mature at 19° than at 13°C. Male and female sockeye salmon held at 19°C had higher plasma chloride and osmolality than those held at 13°C, indicative of a thermally related stress response. These findings suggest that sex differences and proximity to reproductive maturity must be considered when predicting thermal tolerance and the magnitude of en route and prespawn mortality for Pacific salmon.
Language eng
DOI 10.1086/663770
Field of Research 0608 Zoology
1116 Medical Physiology
0606 Physiology
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2012, University of Chicago
Persistent URL http://hdl.handle.net/10536/DRO/DU:30105125

Document type: Journal Article
Collections: School of Life and Environmental Sciences
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