Climate change models predict increased frequency and intensity of extreme thermal events, suggesting that exposure to stressful high temperatures will likely become more common for many organisms. I investigated how frequency of exposure to sublethal temperature stress impacted the relative shell growth and size-specific tissue mass of the California mussel, Mytilus californianus . Mussels were exposed in the lab to 32 °C during simulated low tides 0, 1, 4, or 7 days per week for eight weeks or transplanted into rocky intertidal plots exhibiting a range of thermal conditions in the field for 12 weeks, then challenged with repeated exposures to a more extreme temperature (36, 39, or 42 °C) for 5 sequential days. As predicted by theory, increased frequency of exposure to sublethal heat stress invoked a cost to individuals, expressed as reduced shell growth or size-specific tissue mass, but also resulted in higher survival following subsequent exposure to potentially lethal temperatures.
|Advisor:||Allen, Bengt J.|
|Commitee:||Pernet, Bruno, Whitcraft, Christine|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 57/02M(E), Masters Abstracts International|
|Subjects:||Ecology, Biological oceanography|
|Keywords:||Climate change, Growth, Heat stress, Intertidal zone, Survival, Trade-off|
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