Integrated organismal responses induced by ecologically-relevant pCO2 and temperature exposures in developing lake sturgeon
Belding, L. D.; Thorstensen, M. J.; Quijada-Rodriguez, A.; Bugg, W. S.; Yoon, G. R.; Loeppky, A. R.; Allen, G. J. P.; Schoen, A. N.; Earhart, M. L.; Brandt, C.; Ali, J. L.; Weihrauch, D.; Jeffries, K. M.; Anderson, W. G.
Show abstract
Atmospheric CO2 and temperature are rising concurrently, and may have profound impacts on the transcriptional, physiological, and behavioral responses of aquatic organisms. Further, spring snow melt may cause transient increases of pCO2 in freshwater systems. Lake sturgeon (Acipenser fulvescens) groups were raised in current and projected levels of warming and pCO2. Following an overwintering period, lake sturgeon were exposed to a transient increase in pCO2, simulating a spring melt. Diverging transcriptional patterns were found in each group and metabolic rate was lower in the combined stressor group compared to others. Behavioral assays revealed no effect of environment on alarm cue responses or boldness, but there was a decrease in total activity following an acute CO2 exposure. These results demonstrate compensatory and compounding mechanisms of pCO2 and warming dependent on developmental conditions of a freshwater fish, and provide key information for responses to future climate change.
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