Effect of Danube River dam on Black Sea biogeochemistry and ecosystem structure

  title={Effect of Danube River dam on Black Sea biogeochemistry and ecosystem structure},
  author={Christoph Humborg and V. Ittekkot and Adriana Cociasu and Bodo von Bodungen},
Rivers contribute significantly to the pollution and eutrophication that have caused drastic changes to the ecosystem of the Black Sea1–3. Although damming is known to affect riverborne nutrient loads, and thus riverine ecosystems, evidence for significant effects in open coastal waters is sparse4–6. Here we present long-term data sets of water and nutrient discharge from the River Danube to the Black Sea. These data reveal a reduction in the dissolved silicate load of the river by about two… 
Silicon Retention in River Basins: Far-reaching Effects on Biogeochemistry and Aquatic Food Webs in Coastal Marine Environments
Regulation of rivers by damming as well as eutrophication in river basins has substantially reduced dissolved silicon loads to the Black Sea and the Baltic Sea, resulting in changes in the nutrient composition of river discharges.
Nitrogen and phosphorus have been treated as important substances related to the eutrophication and the water quality such as red tide. However, silicon is one of substance to compose an organic
Long-term changes in the Changjiang Estuary plankton community related to anthropogenic eutrophication
The Changjiang River is well-known to channel significant anthropogenic influences to the estuary. However, long-term changes in plankton community related to anthropogenic eutrophication in the
Biogenic silica accumulation in the sediments of Iron Gate I Reservoir on the Danube River
Abstract.Damming of rivers can result in severe downstream effects such as changing sediment and nutrient fluxes that potentially affect coastal ecosystems. Closing of the Iron Gates Dams in the
Modelling the Danube-influenced North-western Continental Shelf of the Black Sea. II: Ecosystem Response to Changes in Nutrient Delivery by the Danube River after its Damming in 1972
The ecological model BIOGEN, describing the carbon, nitrogen, phosphorus and silicon cycling throughout aggregated chemical and biological compartments of the planktonic and benthic marine systems,
Hydrological alterations with river damming in northern Sweden: Implications for weathering and river biogeochemistry
This case study tests the hypothesis that damming leads to a depletion of major elements in river systems. It determines the effect of river dams on the weathering regime, and thus on dissolved


Coastal eutrophication near the Mississippi river delta
CHANGES in delivery of river-borne nutrients such as dissolved phosphate, nitrate and silicate, owing to land-use changes and anthropogenic emissions, are known to result in eutrophication1— enhanced
Changes in the hydrochemistry of the Black Sea inferred from water density profiles
DURING the past two decades, catastrophic changes have occurred in the Black Sea ecosystem: the influx of pollution from the major rivers has caused intense eutrophication at the northwest coastal
Fixation of dissolved silicate and sedimentation of biogenic silicate in the lower river Rhine during diatom blooms
Concentrations of dissolved silicate and particulate biogenic silicate were measured in three branches of the lower river Rhine in The Netherlands in order to analyse the role of this element in the
Depletion of barium and radium-226 in Black Sea surface waters over the past thirty years
THE nearly landlocked waters of the Black Sea support a valuable fishery, but are also particularly vulnerable to anthropogenic disturbance. Here we use dissolved barium and radium-226 as tracers, to
Unexpected changes in the oxic/anoxic interface in the Black Sea
THE Black Sea is the largest anoxic marine basin in the world today1. Below the layer of oxygenated surface water, hydrogen sulphide builds up to concentrations as high as 425 μM in the deep water
The Possible Importance of Silicon in Marine Eutrophication
Arguments are presented that silicon is often the controlling nutrient in altering a diatom to a flagellate community and examples of such alterations are presented for oceanic, estuarine and inland water bodies.
Coastal marine eutrophication: A definition, social causes, and future concerns
Abstract There is a need in the marine research and management communities for a clear operational definition of the term, eutrophication. I propose the following: This definition is consistent with