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Issue 6, 2016
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Riparian shading controls instream spring phytoplankton and benthic algal growth

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Abstract

Dissolved oxygen (DO) concentrations showed a striking pattern in a multi-year study of the River Enborne, a small river in SE England. In each of three years (2010–2012), maximum DO concentrations were attained in mid-April, preceded by a period of steadily increasing diurnal amplitudes, followed by a steady reduction in both amplitude and concentration. Flow events during the reduction period reduce DO to low concentrations until the following spring. Evidence is presented that this pattern is mainly due to benthic algal growth which is eventually suppressed by the growth of the riparian tree canopy. Nitrate and silicate concentrations are too high to inhibit the growth of either benthic algae or phytoplankton, but phosphate concentrations might have started to reduce growth if the tree canopy development had been delayed. This interpretation is supported by evidence from weekly flow cytometry measurements and analysis of the diurnal, seasonal and annual patterns of nutrient concentrations. As the tree canopy develops, the river switches from an autotrophic to a heterotrophic state. The results support the use of riparian shading to help control algal growth, and highlight the risks of reducing riparian shade.

Graphical abstract: Riparian shading controls instream spring phytoplankton and benthic algal growth

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Publication details

The article was received on 17 Mar 2016, accepted on 09 May 2016 and first published on 10 May 2016


Article type: Paper
DOI: 10.1039/C6EM00179C
Citation: Environ. Sci.: Processes Impacts, 2016,18, 677-689
  • Open access: Creative Commons BY license
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    Riparian shading controls instream spring phytoplankton and benthic algal growth

    S. J. Halliday, R. A. Skeffington, A. J. Wade, M. J. Bowes, D. S. Read, H. P. Jarvie and M. Loewenthal, Environ. Sci.: Processes Impacts, 2016, 18, 677
    DOI: 10.1039/C6EM00179C

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