[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.
Research Center/Unit :
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
Disciplines :
Aquatic sciences & oceanology
Author, co-author :
Ralison, Olivier Harifidy; Vrije Universiteit Brussel > Department of Analytical and Environmental Chemistry
Borges, Alberto ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique
Dehairs, Frank; Vrije Universiteit Brussel > Department of Analytical and Environmental Chemistry
Bouillon, Steven
Language :
English
Title :
Carbon biogeochemistry of the Betsiboka Estuary (north-western Madagascar)
Publication date :
2008
Journal title :
Organic Geochemistry
ISSN :
0146-6380
Publisher :
Pergamon Press - An Imprint of Elsevier Science, Oxford, United Kingdom
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