Comparative Physiology of Calcium Transport in Crustacean (Homarus Americanus) and Echinoderm (Helianthoides Pycnopodia) Gastrointestinal Epithelia
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1996-05
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University of Hawaii at Manoa
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Calcium ions play a critical role in maintaining normal life activities of an organism such as in controlling enzymes and signal pathways, as a structural component in the skeleton of vertebrates and many invertebrates, etc. Knowledge of calcium regulation and transport is therefore important for an understanding of a wide array of biological processes. Elucidation of the calcium transport mechanisms of the brush border and basolateral membranes of both the lobster and the sea star will contribute important advances to our understanding of the comparative and evolutionary physiology of transport processes in invertebrates. Descriptions of ion transport by the digestive gland of Decapoda are still in their primary stages, with the 2 Na+ / H+ antiporter as the only example of a transport system which is satisfactorily explained. Understanding of the possible common occurrence and utilization of this antiporter in cation transport in invertebrates will be a significant addition to the biology of invertebrates and may also provide some insight into the evolution of transport proteins within the animal kingdom. Lastly, but not least, as the lobster is an animal with high economic value in the world, an increased knowledge of its physiology may provide some insights into improving the growth and production of this species in cultivation.
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American lobster--Physiology, Starfishes--Physiology, Calcium--Physiological transport
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Theses for the degree of Doctor of Philosophy (University of Hawaii at Manoa). Zoology; no. 3350
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