La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Sources, Distribution and Preservation of Organic Matter in a Tropical Estuary (Godavari, India)
Auteurs :	M. S. Krishna, Auteur ; S. A. Naidu, Auteur ; Ch V. Subbaiah, Auteur ; L. Gawade, Auteur ; V. V. S. S. Sarma, Auteur ; N. P. C. Reddy, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (38(3) MAY 2015)
Article en page(s) :	1032-1047
Résumé :	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) 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-3 plants (10 %) in the lower estuary, during the study period. On the other hand, sediment

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