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Over the past centuries, rivers and streams across Europe and Northern America have increasingly been modified by damming and by other water regulation schemes. This situation is also becoming increasingly common throughout tropical regions. In the vast majority of cases, such schemes have been developed with little or no consideration to the ichthyofauna, and impacts on biodiversity and fisheries...
Lowland rivers in industrial countries such as the UK are seriously impacted by phosphorus from a variety of sources. Point sources include numerous sewage-treatment works; diffuse sources include a full range of agricultural activities from fertiliser application to intensive poultry and stock rearing. The scientific consensus is that the concentration of phosphorus is an important measure of eutrophication...
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