Original paper

Chlorophyll-a and hydro-chemical dynamics in a backwater system of the Danube, controlled by hydrology

Hein, T.; Schagerl, M.; Heiler, G.; Schiemer, F.

Large Rivers Vol. 10 No. 1-4 (1996), p. 463 - 470

19 references

published: Sep 18, 1996

DOI: 10.1127/lr/10/1996/463

BibTeX file

ArtNo. ESP142011300057, Price: 29.00 €

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Abstract

A gradient of hydrological connections between backwaters and the main river was investigated along a lateral transect of a floodplain in the free-flowing section of the Danube downstream of Vienna. Increasing distance from the Danube generally correlated with decreasing influence. Connected backwaters show an increased nutrient concentration via surface-inflows or seepage supply. Nitrate is a key factor indicating river influence. Phytoplankton biomass, measured as chlorophyll-a, shows higher concentrations at mean water than at times of spates. The nutrient pulse by river seepage leads to a biomass increase according to the gradient of connections with the river.

Keywords

hydrologicalsurface-inflowsbiomassnitratefloodplain