Sources, distribution and preservation of organic matter in a tropical estuary (Godavari, India)

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dc.contributor.author Krishna, M.S.
dc.contributor.author Naidu, S.A.
dc.contributor.author Subbaiah, Ch.V.
dc.contributor.author Gawade, L.
dc.contributor.author Sarma, V.V.S.S.
dc.contributor.author Reddy, N.P.C.
dc.date.accessioned 2015-07-14T07:07:30Z
dc.date.available 2015-07-14T07:07:30Z
dc.date.issued 2015
dc.identifier.citation Estuaries and Coasts, vol.38(3); 2015; 1032-1047
dc.identifier.uri http://drs.nio.org/drs/handle/2264/4742
dc.description.abstract Major sources and distribution of organic matter (OM) were examined in a tropical monsoonal estuary, the Godavari, using content and isotopic signatures in suspended particulate matter and surface sediments during no-discharge period. The lower (<10 km from the mouth) and upper (>10 km) estuaries have shown remarkably different features with reference to the sources, distribution and preservation of OM. The upper estuary is characterized by relatively high content of particulate organic carbon (POC) and chlorophyll-a (Chl-a) and low suspended matter and sediment OC. In contrast, the lower estuary is characterized by relatively low content of particulate OC and Chl-a and high suspended matter and sediment OC. Our data and model results showed that suspended particulate OM is derived predominantly from freshwater phytoplankton in the upper (~85 %) and lower (~60 %) estuaries, with a minor contribution from estuarine phytoplankton (~25 %) and terrestrial C<sub>3</sub> plants (~10 %) in the lower estuary, during the study period. On the other hand, sediment OM in the upper and lower estuaries derived from both autochthonous and allochthonous sources with nearly equal contributions. Although relatively high in situ production was observed in the upper than the lower estuary, relatively low sediment OC was found in the former than the latter region, suggesting that strong influence of preservation conditions rather than surface biological production on OC accumulation in sediments. This is attributed to intense transformation of OM by heterotrophs in the upper than the lower estuary because of prevailing conducive conditions for degradation of OM in the upper estuary during the study period.
dc.language.iso en
dc.publisher Springer
dc.rights An edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2014] Coastal and Estuarine Research Federation
dc.subject CHEMISTRY AND BIOGEOCHEMISTRY
dc.subject CHEMISTRY AND BIOGEOCHEMISTRY
dc.title Sources, distribution and preservation of organic matter in a tropical estuary (Godavari, India)
dc.type Journal Article


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