US EPA

4500861 

Journal Article 

Nutrient dynamics in the deltaic floodplain of the Lower Parana river 

Bonetto, C; de Cabo, L; Gabellone, N; Vinocur, A; Donadelli, J; Unrein, F 

1994 

Yes 

Archiv für Hydrobiologie
ISSN: 0003-9136 

131 

3 (1994) 

277-295 

WOS:A1994PP95700002 

There was a large suspended matter and nitrate decrease from the Lower Parana river to the floodplain lake in permanent contact with the river, and to the surrounding marsh. Suspended reactive phosphorus (SRP) decreased from the river to the lake surface but increased in the suboxic lake bottom, the water hyacinth ring and the marsh. The mean inorganic nitrogen: SRP ratio decreased from 10 in the river to 5 on the lake surface to 3 in the water hyacinth ring to 1.2 in the lake bottom and 0.8 in the flood plain marsh. Bottom lake sediments had lower total nitrogen content than the incoming river suspended matter. Results suggest that the deltaic floodplains represent a sink of nitrogen and a course of SRP derived form river suspended matter. Schoenoplectus californicus, the dominant macrophyte in the marsh was nitrogen limited; Eichhornia crassipes, the dominant macrophyte in the lake may also be nitrogen limited. Phytoplankton bioassays did not provide a conclusive pattern. There are 38 references. 

South America, Parana R.; Argentina; nutrients; nutrient dynamics; phytoplankton; deltas; watersheds; rivers; flood plains; light penetration; 1994)