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Dilution of Seawater Affects the Ca2+ Transport in the Outer Mantle Epithelium of Crassostrea gigas

Journal article
Authors Kirsikka Sillanpää
J. C. D. Cardoso
R. C. Felix
L. Anjos
D. M. Power
Kristina Sundell
Published in Frontiers in Physiology
Volume 11
Pages 15
ISSN 1664-042X
Publication year 2020
Published at SWEMARC
Department of Biological and Environmental Sciences
Pages 15
Language en
Links dx.doi.org/10.3389/fphys.2020.00001
Keywords Ca2+-ATPase, Na+, Ca2+-exchanger, calcium channel, Na+, K+-ATPase, calcification, salinity, cell-volume, shell regeneration, na+/k+-atpase, salinity, oyster, expression, exchange, calcification, mechanisms, hemolymph, Physiology
Subject categories Biological Sciences

Abstract

Varying salinities of coastal waters are likely to affect the physiology and ion transport capabilities of calcifying marine organisms such as bivalves. To investigate the physiological effect of decreased environmental salinity in bivalves, adult oysters (Crassostrea gigas) were exposed for 14 days to 50% seawater (14) and the effects on mantle ion transport, electrophysiology and the expression of Ca2+ transporters and channels relative to animals maintained in full strength sea water (28) was evaluated. Exposure of oysters to a salinity of 14 decreased the active mantle transepithelial ion transport and specifically affected Ca2+ transfer. Gene expression of the Na+/K+-ATPase and the sarco(endo)plasmic reticulum Ca2+-ATPase was decreased whereas the expression of the T-type voltage-gated Ca channel and the Na+/Ca2+-exchanger increased compared to animals maintained in full SW. The results indicate that decreased environmental salinities will most likely affect not only osmoregulation but also bivalve biomineralization and shell formation.

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