Document Detail

Glacial silicic acid concentrations in the Southern Ocean.
MedLine Citation:
PMID:  20966217     Owner:  NLM     Status:  MEDLINE    
Reconstruction of nutrient concentrations in the deep Southern Ocean has produced conflicting results. The cadmium/calcium (Cd/Ca) data set suggests little change in nutrient concentrations during the last glacial period, whereas the carbon isotope data set suggests that nutrient concentrations were higher. We determined the silicon isotope composition of sponge spicules from the Atlantic and Pacific sectors of the Southern Ocean and found higher silicic acid concentrations in the Pacific sector during the last glacial period. We propose that this increase results from changes in the stoichiometric uptake of silicic acid relative to nitrate and phosphate by diatoms, thus facilitating a redistribution of nutrients across the Pacific and Southern Oceans. Our results are consistent with the global Cd/Ca data set and support the silicic acid leakage hypothesis.
Michael J Ellwood; Martin Wille; William Maher
Related Documents :
7974967 - Recent studies of the cellular uptake of long chain free fatty acids.
16580727 - Uptake and decarboxylation of l-3,4-dihydroxyphenylalanine in cultured monkey placenta ...
16078137 - Glycyl-l-glutamine disposition in rat choroid plexus epithelial cells in primary cultur...
15554247 - The "tuebingen desiccator" system, a tool to study oxidative stress in vivo and inhalat...
25014027 - Collection and chemical composition of phloem sap from citrus sinensis l. osbeck (sweet...
2199627 - Pharmacokinetics and tissue distribution of amoxicillin plus clavulanic acid after oral...
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-10-21
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  330     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-11-24     Completed Date:  2010-12-14     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1088-91     Citation Subset:  IM    
Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Diatoms / chemistry
Oceans and Seas
Porifera / chemistry
Silicic Acid / analysis*
Reg. No./Substance:
1343-98-2/Silicic Acid

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

Previous Document:  Efficient atmospheric cleansing of oxidized organic trace gases by vegetation.
Next Document:  Kinetic scaffolding mediated by a phospholipase C-beta and Gq signaling complex.