The effects of acute and chronic hypoxia on cortisol,glucose and lactate concentrations in different populations of three-spined stickleback |
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Authors: | E A O’Connor T G Pottinger L U Sneddon |
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Institution: | (1) School of Biological Sciences, University of Liverpool, The Bioscience Building, Liverpool, L69 7ZB, UK;(2) Centre for Ecology and Hydrology, Lancaster Environment Centre, Library Avenue, Bailrigg, Lancaster, LA1 4AP, UK;(3) Royal Veterinary College, Hawkshead Lane, Hatfield, AL9 7TA, UK |
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Abstract: | The response of individuals from three different populations of three-spined sticklebacks to acute and chronic periods of
hypoxia (4.4 kPa DO, 2.2 mg l−1) was tested using measures of whole-body cortisol, glucose and lactate. Although there was no evidence of a neuroendocrine
stress response to acute hypoxia, fish from the population least likely to experience hypoxia in their native habitat had
the largest response to low oxygen, with significant evidence of anaerobic glycolysis after 2 h of hypoxia. However, there
was no measurable effect of a more prolonged period (7 days) of hypoxia on any of the fish in this study, suggesting that
they acclimated to this low level of oxygen over time. Between-population differences in the analytes tested were observed
in the control fish of the acute hypoxia trial, which had been in the laboratory for 16 days. These differences were not apparent
among the control fish in the chronic exposure groups that had been held in the laboratory for 23 days, suggesting that these
site-specific trends in physiological status were acclimatory. Overall, the results of this study suggest that local environmental
conditions may shape sticklebacks’ general physiological profile as well as influencing their response to hypoxia. |
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