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First published online June 15, 2006
Journal of Experimental Biology 209, 2409-2419 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02257
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Hot limpets: predicting body temperature in a conductance-mediated thermal system

Mark W. Denny1,* and Christopher D. G. Harley1,2

1 Hopkins Marine Station of Stanford University, Pacific Grove, CA 93950, USA
2 Department of Zoology, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada


Figure 1
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  		Fig. 1. A schematic representation of heat transfer to and from a limpet. Dimensions of the model limpet (its radius and height) are shown.

 

Figure 2
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  		Fig. 2. The time series of measured (red line) and predicted (black line) body temperatures for the silver cone. The time series starts at day 4 of the experiment, allowing time for equilibration of estimated rock temperatures. The heat-budget model slightly underestimates body temperatures at night, but accurately predicts maximal temperatures during the day.

 

Figure 3
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  		Fig. 3. The data from Fig. 2 replotted to emphasize deviations between predicted and measured temperatures for the silver cone. The line of equivalence between predicted and measured temperature is shown in red.

 

Figure 4
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  		Fig. 4. Predicted and measured temperatures for the silver-bodied limpet. There are deviations between prediction and measurement at moderate temperatures, but close agreement at high temperatures. The line of equivalence between predicted and measured temperature is shown in red.

 

Figure 5
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  		Fig. 5. Predicted and measured temperatures for live limpets. The line of equivalence between predicted and measured temperature is shown in red. A and B show the results of two separate experiments on two different limpets.

 

Figure 6
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  		Fig. 6. Rock temperature, as well as both measured and predicted limpet body temperatures, exceed air temperature throughout a typical day. The circled deviation between rock and body temperatures is due to spatial separation between locations of the two measurements: the rock entered the shadow of the setting sun prior to the limpet.

 

Figure 7
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  		Fig. 7. Heat fluxes for the day shown in Fig. 6. Near midday, when limpet temperature is highest, heat is shed by convection (green line) and conduction (blue line) in roughly equal amounts.

 




© The Company of Biologists Ltd 2006