Understanding species' temperature tolerances in the context of concurrent environmental stressors is critical because thermal regimes of freshwater ecosystems are changing. We evaluated the critical thermal maximum (CTM) of 3 freshwater mussel species (Alasmidonta varicosa, Elliptio complanata, and Strophitus undulatus) acclimated to 2 temperatures (15 and 25°C) and exposed to 2 aeration treatments (aerated vs unaerated) during CTM testing. Responses varied by species, but mussels acclimated to 25°C generally had a higher CTM than mussels acclimated to 15°C. For E. complanata, the effects of acclimation temperature and aeration were interactive, such that CTM was highest at 15°C but only under aerated conditions. Our results indicate that recent thermal history affects thermal tolerance, combinations of environmental stressors may influence thermal tolerance, and such responses vary among species.
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13 December 2012
Recent thermal history influences thermal tolerance in freshwater mussel species (Bivalvia:Unionoida)
Heather S Galbraith,
Carrie J Blakeslee,
William A Lellis
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Freshwater Science
Vol. 31 • No. 1
March 2012
Vol. 31 • No. 1
March 2012
acclimation
critical thermal maximum
gape behavior
hypoxia
thermal stress
traits
unionid