Reference : Carbon biogeochemistry of the Betsiboka Estuary (north-western Madagascar)

	Document type :	Scientific journals : Article
	Discipline(s) :	Life sciences : Aquatic sciences & oceanology
	To cite this reference:	http://hdl.handle.net/2268/2668

Title :	Carbon biogeochemistry of the Betsiboka Estuary (north-western Madagascar)
Language :	English
Author, co-author :	Ralison, Olivier Harifidy [Vrije Universiteit Brussel > Department of Analytical and Environmental Chemistry]
	Borges, Alberto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique >]
	Dehairs, Frank [Vrije Universiteit Brussel > Department of Analytical and Environmental Chemistry]
	Bouillon, Steven [> > > >]
Publication date :	2008
Journal title :	Organic Geochemistry
Publisher :	Pergamon Press - An Imprint of Elsevier Science
Volume :	39
Pages :	1649–1658
Audience :	International
ISSN :	0146-6380
City :	Oxford
Country :	United Kingdom
Abstract :	[en] Madagascar’s largest estuary (Betsiboka) was sampled along the salinity gradient during the dry season to document the distribution and sources of particulate and dissolved organic carbon (POC, DOC) as well as dissolved inorganic carbon (DIC). The Betsiboka was characterized by a relatively high suspended matter load, and in line with this, low DOC/POC ratios ( 0.4–2.5). The partial pressure of CO2 (pCO2) was generally above atmospheric equilibrium (270–1530 ppm), but relatively low in comparison to other tropical and subtropical estuaries, resulting in low average CO2 emission to the atmosphere (9.1 ± 14.2 mmol m 2 d 1). Despite the fact that C4 vegetation is reported to cover >80% of the catchment area, stable isotope data on DOC and POC suggest that C4 derived material comprises only 30% of both pools in the freshwater zone, increasing to 60–70% and 50–60%, respectively, in the oligohaline zone due to additional lateral inputs. Sediments from intertidal mangroves in the estuary showed low organic carbon concentrations (<1%) and d13C values (average 19.8‰) consistent with important inputs of riverine imported C4 material. This contribution was reflected in d13C signatures of bacterial phospholipid derived fatty acids (i + a15:0), suggesting the potential importance of terrestrial organic matter sources for mineralization and secondary production in coastal ecosystems.
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/2668

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