Abstract
The rate of oxygen uptake of three species of tropical intertidal gastropods, Nerita tessellata Gmelid., N. Versicolor Gmelin and N. Peloronta L., have been investigated under different environmental conditions. In all species the rates increased from 30 to 37°C, were depressed at 20 °C and were not size-dependent at that temperature. The rates of oxygen uptake varied between individuals collected from different habitats and were greater in areas of higher mean maximum daily temperatures, lower rainfall and lower wind speeds than in areas with the reverse conditions. A decrease in oxygen uptake was shown to occur with an increase of exposure time of the animals on the shore and in the laboratory. Rates were higher in two species collected at the time of high tide than those collected at the same level after exposure to low tides.
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