ASPEUTS OF STRESS IN THE TROPICAL MARINE ENVIRONMENT
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ment, and that this may involve both a reduction in growth rate and
also an inability to live outside the tropics. Adequate information on
the geographic range of those species on which we have growth data is
not always available. We have been able, however, to obtain an
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Temperature - O C
Fro. 14. Relation of growth rate to temperature in bivalves.
adequate array of data by combining rates for bivalves and barnacles.
This was made possible by bringing the data for the two groups to a
common standard tissue weight. Figure 16 shows the winter minimum
temperature at the poleward limit of each species plotted against its
growth rate in the tropics. Clearly, those species which grow fast in the