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Consequences of Calcium Deficiency on Embryogenesis in a Keystone Freshwater Crustacean: Daphnia magna

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Title: Consequences of Calcium Deficiency on Embryogenesis in a Keystone Freshwater Crustacean: Daphnia magna
Author: Giardini, Jamie-Lee
Department: Department of Integrative Biology
Program: Integrative Biology
Advisor: Heyland, Andreas
Abstract: Ambient calcium is declining in thousands of soft-water lake habitats as a consequence of unsustainable forestry practices, decreased atmospheric calcium deposition, and acidic deposition. The freshwater crustacean Daphnia magna possesses a high specific calcium content relative to other aquatic organisms, which makes it ideal for investigating the consequences of calcium decline. Adult and juvenile Daphnia have different tolerances to low ambient calcium as a result of their different life stage specific functions and calcium requirements. This study focuses on the consequences of calcium decline on Daphnia magna embryos and embryogenesis. An embryonic staging scheme was developed to pursue this focus. The major findings suggest that calcium is involved in developmental processes, and may have particular significance within the first 30hrs of embryonic development. Maternal calcium provisioning to embryos occurs exclusively during embryo formation, and females can adjust embryonic calcium provisioning (quantitatively) during times of ambient calcium shortage.
URI: http://hdl.handle.net/10214/7805
Date: 2014-01


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