Graduate Thesis Or Dissertation
 

Metabolic adaptations of the marine gastropod Thais emarginata

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  • Thais emarginata is a gastropod which inhabits the midlittoral zone of the intertidal region. Oxygen consumption of high-level and low-level organisms was determined at various seasons of the year over an experimental temperature range of 5 to 20° C. No significant difference in respiratory rate between separate populations of high-level and low level organisms was found. Temperature compensation studies performed by testing both field-acclimatized and laboratory acclimated organisms indicated that the low-level organisms adapted to cold temperatures (8- 10°C. ) responded by having respiratory rates more sensitive to warmer (20°C. ) temperatures. High-level organisms adapted to cold temperatures (8-10°C. ) responded in the same manner as warm adapted (17°C. ) high-level organisms. Both high-level and low-level organisms showed partial temperature compensation. Respiratory rates measured at different times of the year indicated that respiratory rates were higher during warmer months of the year and also during those months (August and September) in which the organisms were actively feeding. Respiratory rates during this time were also more temperature dependent than at other times during the year. Respiratory rates tended to be higher before the reproductive season than following reproduction. During the colder months, following reproduction, respiratory rates were generally lower than during warmer months. It was concluded that T. emarginata is a metabolic regulator. Environmental temperature, feeding activity and reproductive activity are factors which affect respiratory rate of the organism. Individual variability and behavioral modifications are important mechanisms which enable T. emarginata to successfully inhabit the intertidal zone.
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