Graduate Thesis Or Dissertation
 

A study of the effects of exposure to air on the respiration of two intertidal snails

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  • Callistoma costatum and Tegula funebralis, marine intertidal snails from low and high littoral zones respectively, were exposed to air for two, six and twelve hour periods, during which time their oxygen consumption rates were measured. The animals were then immersed in sea water and their respiration rates recorded for a period of four hours. The oxygen consumption rates were corrected to a standard 0.1 gram animal using plots of metabolic rate versus weight. Calliostoma has a higher respiration rate in water than Tegula. In air, Tegula has the higher rate. The respiration of the two species in water following varying durations of exposure to air follow different patterns. In Tegula there is in all cases an initial rise followed by a decline in respiration. In Calliostoma the recovery pattern is irregular but in all cases the trend indicates a gradual increase in oxygen consumption rate following immersion in water. The significance of these findings in relation to the position of the species in the intertidal is discussed. Some of the factors (size, tidal and circadian rhythms, sex, activity, nutritional state and oxygen tension) which could influence respiration rates are discussed.
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