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dc.contributor.authorBouillon, S.
dc.contributor.authorAbril, G.
dc.contributor.authorBorges, A.V.
dc.contributor.authorDehairs, F.
dc.contributor.authorGovers, G.
dc.contributor.authorHughes, H.J.
dc.contributor.authorMerckx, R.
dc.contributor.authorMeysman, FJR.
dc.contributor.authorNyunga, J.
dc.contributor.authorOsburn, C.
dc.contributor.authorMiddelburg, J.J.
dc.date2009
dc.date.accessioned2016-03-15T10:03:30Z
dc.date.available2016-03-15T10:03:30Z
dc.identifier.issn1726-4170
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/569
dc.descriptionThe Tana River basin (TRB) is the largest in Kenya (~120 000 km<sup>2</sup>). We conducted a survey during the dry season throughout the TRB, analyzing a broad suite of biogeochemical parameters. Biogeochemical signatures in headwater streams were highly variable. Along the middle and lower river course, total suspended matter (TSM) concentrations increased more than 30-fold despite the absence of tributary inputs, indicating important resuspension events of internally stored sediment. These resuspended sediment inputs were characterized by a lower and <sup>14</sup>C-depleted OC content, suggesting selective degradation of more recent material during sediment retention. Masinga Dam (a large reservoir on the upper river) induced a strong nutrient retention (~50% for inorganic N, ~72% for inorganic phosphate, and ~40% for dissolved silicate). Moreover, while DOC pools and &#948;<sup>13</sup>C signatures were similar above, in and below the reservoir, the POC pool in Masinga surface waters was dominated by <sup>13</sup>C-depleted phytoplankton, which contributed to the riverine POC pool immediately below the dam, but rapidly disappeared further downstream, suggesting rapid remineralization of this labile C pool in the river system. Despite the generally high turbidity, the combination of relatively high oxygen saturation levels, low &#948;<sup>18</sup>O signatures of dissolved O<sub>2</sub> (all &lt;+24.2 ), and the relatively low pCO<sub>2</sub> values suggest that in-stream primary production was significant, even though pigment data suggest that phytoplankton makes only a minor contribution to the total POC pool in the Tana River.
dc.languageeng
dc.publisherCopernicus GmbH
dc.titleDistribution, origin and cycling of carbon in the Tana River (Kenya): a dry season basin-scale survey from headwaters to the delta
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceScientific
dc.subject.freeSurface environments and collection management
dc.source.titleBiogeosciences
dc.source.volume6 - 11
dc.source.page2475 2493
Orfeo.peerreviewedYes
dc.identifier.urlwww.biogeosciences.net/6/2475/2009/
dc.identifier.rmca556


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