Temperature and salinity adaptation in the purple shore crab Hemigrapsus nudus: An in vitro metabolic flux study with excised gills |
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Authors: | W. C. Hulbert D. E. Schneider T. W. Moon |
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Affiliation: | (1) Department of Biology, University of Ottawa, Ontario, Canada;(2) Department of Biology, Western Washington State College, Bellingham, Washington, USA |
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Abstract: | The effects of temperature and salinity acclimation on intermediary metabolism in excised gill homogenates from Hemigrapsus nudus were examined. In general, a decrease in salinity was followed by an increase in the oxidation of the substrates glucose-1-14C, acetate-1-14C and glycine-14C to 14CO2. Also, there was an increase in amino acid incorporation into the protein fraction. Both of these metabolic parameters were differentially temperature-sensitive. An enzymic model which may explain the increase in respiration rate observed in several intertidal invertebrates meeting an hypo-osmotic stress is proposed, using data from these experiments and also from the literature. |
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