Document Detail

Predominance of heavily calcified coccolithophores at low CaCO3 saturation during winter in the Bay of Biscay.
MedLine Citation:
PMID:  22615387     Owner:  NLM     Status:  MEDLINE    
Coccolithophores are an important component of the Earth system, and, as calcifiers, their possible susceptibility to ocean acidification is of major concern. Laboratory studies at enhanced pCO(2) levels have produced divergent results without overall consensus. However, it has been predicted from these studies that, although calcification may not be depressed in all species, acidification will produce "a transition in dominance from more to less heavily calcified coccolithophores" [Ridgwell A, et al., (2009) Biogeosciences 6:2611-2623]. A recent observational study [Beaufort L, et al., (2011) Nature 476:80-83] also suggested that coccolithophores are less calcified in more acidic conditions. We present the results of a large observational study of coccolithophore morphology in the Bay of Biscay. Samples were collected once a month for over a year, along a 1,000-km-long transect. Our data clearly show that there is a pronounced seasonality in the morphotypes of Emiliania huxleyi, the most abundant coccolithophore species. Whereas pH and CaCO(3) saturation are lowest in winter, the E. huxleyi population shifts from <10% (summer) to >90% (winter) of the heavily calcified form. However, it is unlikely that the shifts in carbonate chemistry alone caused the morphotype shift. Our finding that the most heavily calcified morphotype dominates when conditions are most acidic is contrary to the earlier predictions and raises further questions about the fate of coccolithophores in a high-CO(2) world.
Helen E K Smith; Toby Tyrrell; Anastasia Charalampopoulou; Cynthia Dumousseaud; Oliver J Legge; Sarah Birchenough; Laura R Pettit; Rebecca Garley; Sue E Hartman; Mark C Hartman; Navjit Sagoo; Chris J Daniels; Eric P Achterberg; David J Hydes
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-05-21
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  109     ISSN:  1091-6490     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-06-06     Completed Date:  2012-08-27     Revised Date:  2013-06-24    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  8845-9     Citation Subset:  IM    
Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, Southampton SO14 3ZH, United Kingdom.
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MeSH Terms
Calcium / analysis*
Calcium Carbonate / analysis
Climate Change*
Haptophyta / chemistry*,  physiology
Hydrogen-Ion Concentration
Oceans and Seas
Population Density
Satellite Communications
Seawater / chemistry
Reg. No./Substance:
471-34-1/Calcium Carbonate; 7440-70-2/Calcium

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

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