In response to thermal stress, rocky shore organisms exhibit characteristic physiological changes associated with increased thermal tolerance. Although presumably adaptive, activation of the heat shock response requires an energetic investment and therefore may impose a trade-off between certain life history traits. In this study I investigated the potentially interactive effects of heat stress and food availability on the growth and survival of Mytilus californianus. Chronic heat stress invoked a cost to individuals, expressed as a reduction in shell growth or size-specific tissue mass, at the same time resulting in increased survival following an acute high temperature event. Overall, mussels receiving less food exhibited poor condition and survival relative to individuals fed more, suggesting that food limitation decreases an individual's ability to mitigate the costs of thermal stress. My data provide support for the idea that acclimatory responses to temperature stress can drive a trade-off between survival and growth or condition.
|Advisor:||Allen, Bengt J.|
|Commitee:||Kelley, Kevin M., Pernet, Bruno|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 51/03M(E), Masters Abstracts International|
|Subjects:||Ecology, Aquatic sciences|
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