Reference : Delayed and reduced coccolithophorid calcification under elevated PCO2
Scientific congresses and symposiums : Poster
Life sciences : Aquatic sciences & oceanology
Life sciences : Environmental sciences & ecology
http://hdl.handle.net/2268/81242
Delayed and reduced coccolithophorid calcification under elevated PCO2
English
Delille, Bruno mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique >]
Harlay, Jérôme mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique >]
Zondervan, Ingrid [Leibniz Institut für Meereswissenschaften, Universität Kiel > > > >]
Chou, Lei [Laboratoire d’Océanographie Chimique et Géochimie des Eaux, Faculté des Sciences, Université Libre de Bruxelles, B-1050 Brussels, Belgium > > > >]
Wollast, Roland [Laboratoire d’Océanographie Chimique et Géochimie des Eaux, Faculté des Sciences, Université Libre de Bruxelles, B-1050 Brussels, Belgium > > > >]
Borges, Alberto mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique >]
Frankignoulle, Michel [Unité d’Océanographie Chimique, Université de Liège, B-4000 Liège, Belgium > > > >]
Riebesell, Ulf [Leibniz Institut für Meereswissenschaften, Universität Kiel > > > >]
Gattuso, Jean-Pierre [Laboratoire d’Océanographie de Villefranche, UMR 7093 CNRS-UPMC, BP 28, 06234 Villefranche-sur-mer Cedex, France > > > >]
10-May-2004
No
No
International
The Ocean in a High-CO2 World - International Symposium
10-12 May 2004
UNESCO
Paris
France
[en] Numerous experiments to date have demonstrated that elevated PCO2 is detrimental to biogenic calcification rates. However, most of these experiments have been realized in batch or continuous cultures and give little information on the dynamics of calcification in natural conditions. The present work describes the development and decay of a nutrient-induced bloom of the coccolithophorid Emiliania huxleyi in a mesocosm experiment. The monitoring of Dissolved Inorganic Carbon (DIC) and Total Alkalinity (TAlk) within the seawater enclosures allowed us to describe comprehensively day to day dynamics of both calcification and organic carbon production. Three atmospheric PCO2 conditions (glacial, present and next century) were simulated by bubbling CO2 mixtures, while total alkalinity was left to evolve from its present value. No conspicuous change of Net Community Production under elevated PCO2 was recorded while the production of inorganic carbon appeared to be affected in two ways. Firstly, the production rate of inorganic carbon appeared to be lowered by 40% in the next century PCO2 conditions, decreasing concomitantly the calcification to photosynthesis ratio from 0.75 (glacial conditions) to 0.45 (next century conditions). Secondly, the onset of calcification was delayed by 24~48h under elevated PCO2 conditions, reducing the overall length of calcification in the course of the bloom. These two effects would act to reduce the amount of precipitated CaCO3 by coccolithophorids in a High CO2 world
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/81242

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Open access
poster_delille_et_al_paris_2004.pdfAuthor preprint1.83 MBView/Open

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.