Document Detail


Acquisition of Ca(2+) and HCO3(-)/CO3(2-) for shell formation in embryos of the common pond snail Lymnaea stagnalis.
MedLine Citation:
PMID:  20361194     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Embryos of the freshwater common pond snail Lymnaea stagnalis develop to hatch within 10 days under control conditions (22°C, Miami-Dade tap water) and this development is impaired by removal of ambient calcium. In contrast, embryos did not exhibit dependence upon an ambient HCO(3)(-)/CO(3)(2-) source, developing and hatching in HCO(3)(-)/CO(3)(2-)-free water at rates comparable to controls. Post-metamorphic, shell-laying embryos exhibited a significant saturation-type calcium uptake as a function of increasing ambient calcium concentration. However, changes in ambient bicarbonate concentration did not influence calcium or apparent titratable alkalinity uptake. There was a distinct shift from no significant flux in pre-metamorphic embryos to net uptake of calcium in post-metamorphic stages as indicated by an increased uptake from the micro-environment surrounding the egg mass and increased net uptake in 24-h, whole egg mass flux measurements. Furthermore, HCO(3)(-)/CO(3)(2-) acquisition as measured by titratable alkalinity flux is at least partially attributable to an endogenous carbonate source that is associated with acid extrusion. Thus, calcium requirements for embryonic shell formation are met via uptake but HCO(3)(-)/CO(3)(2-), which is also necessary for shell formation is acquired in part from endogenous sources with no detectable correlation to ambient HCO(3)(-)/CO(3)(2-) availability.
Authors:
Sue C Ebanks; Michael J O'Donnell; Martin Grosell
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2010-04-02
Journal Detail:
Title:  Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology     Volume:  180     ISSN:  1432-136X     ISO Abbreviation:  J. Comp. Physiol. B, Biochem. Syst. Environ. Physiol.     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-09-16     Completed Date:  2011-01-21     Revised Date:  2013-05-29    
Medline Journal Info:
Nlm Unique ID:  8413200     Medline TA:  J Comp Physiol B     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  953-65     Citation Subset:  IM    
Affiliation:
Division of Marine Biology and Fisheries, Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149, USA. sebanks@rsmas.miami.edu
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MeSH Terms
Descriptor/Qualifier:
Acid-Base Equilibrium
Algorithms
Ammonia / metabolism
Animals
Bicarbonates / metabolism*
Calcification, Physiologic
Calcium / metabolism*
Egg Shell / metabolism
Embryo, Nonmammalian / physiology*
Embryonic Development*
Extraembryonic Membranes / physiology
Fresh Water / chemistry
Hydrogen-Ion Concentration
Ion-Selective Electrodes
Kinetics
Lymnaea / embryology*,  growth & development,  physiology*
Membrane Potentials
Metamorphosis, Biological
Microchemistry / methods
Nutritional Requirements
Chemical
Reg. No./Substance:
0/Bicarbonates; 7440-70-2/Calcium; 7664-41-7/Ammonia
Comments/Corrections

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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