Abstract
Synchronous measurements were made of the routine rate of oxygen consumption and the clearance rate of Phaeodactylum tricornutum at different exposure temperatures by specimens of the suspension-feeding gastropod Crepidula fornicata which had been acclimated to temperatures between 10° and 25°C. The results show that the cost of activity (μl O2 consumed h-1/ml seawater cleared h-1) increases dramatically in individuals exposed to short-term increases of temperature up to 30°C, especially in limpets acclimated to 10°C. The process of thermal acclimation, however, results in two compensatory adjustments in energy expenditure and uptake which profoundly affect the energetics of water transport. Firstly, the routine oxygen consumption shows lateral translation of the rate-temperature curve which results in the maintenance of a relatively uniform energy expenditure despite an increase in acclimation temperature from 10° to 25°C. Secondly, because of the form of the rate-temperature curve for filtration by C. fornicata, lateral translation in response to warm acclimation results in an increase in the maximal clearance rate. Lateral translation of the rate-temperature curves for feeding rates and for oxygen consumption in response to thermal acclimation may thus be linked to maintain a balance between energy gain and expenditure. In this way, the greatly increased cost of activity which would occur with increase of temperature in the absence of acclimation is evaded. The minimal maintenance energy requirement, and hence the greatest scope for growth and reproduction, is then adjusted to coincide with temperatures prevailing in the environment.
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Communicated by T.M. Fenchel, Aarhus
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Newell, R.C., Kofoed, L.H. Adjustment of the components of energy balance in the gastropod Crepidula fornicata in response to thermal acclimation. Marine Biology 44, 275–286 (1977). https://doi.org/10.1007/BF00387708
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DOI: https://doi.org/10.1007/BF00387708