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, M. Loewenthal

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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.
Original languageEnglish
Pages (from-to)677-689
Number of pages13
JournalEnvironmental Science: Processes and Impacts
Volume18
Issue number6
Early online date10 May 2016
DOIs
Publication statusPublished - 2016

Cite this

Halliday, S. J., Skeffington, R. A., Wade, A. J., Bowes, M. J., Read, D. S., Jarvie, H. P., & Loewenthal, M. (2016). Riparian shading controls instream spring phytoplankton and benthic algal growth. Environmental Science: Processes and Impacts, 18(6), 677-689. https://doi.org/10.1039/c6em00179c
Halliday, S. J. ; Skeffington, R. A. ; Wade, A. J. ; Bowes, M. J. ; Read, D. S. ; Jarvie, H. P. ; Loewenthal, M. / Riparian shading controls instream spring phytoplankton and benthic algal growth. In: Environmental Science: Processes and Impacts. 2016 ; Vol. 18, No. 6. pp. 677-689.
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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.",
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Halliday, SJ, Skeffington, RA, Wade, AJ, Bowes, MJ, Read, DS, Jarvie, HP & Loewenthal, M 2016, 'Riparian shading controls instream spring phytoplankton and benthic algal growth', Environmental Science: Processes and Impacts, vol. 18, no. 6, pp. 677-689. https://doi.org/10.1039/c6em00179c

Riparian shading controls instream spring phytoplankton and benthic algal growth. / Halliday, S. J.; Skeffington, R. A.; Wade, A. J.; Bowes, M. J.; Read, D. S.; Jarvie, H. P.; Loewenthal, M.

In: Environmental Science: Processes and Impacts, Vol. 18, No. 6, 2016, p. 677-689.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Riparian shading controls instream spring phytoplankton and benthic algal growth

AU - Halliday, S. J.

AU - Skeffington, R. A.

AU - Wade, A. J.

AU - Bowes, M. J.

AU - Read, D. S.

AU - Jarvie, H. P.

AU - Loewenthal, M.

N1 - Funding: NERC (NE/J011967/1); EPSRC (EP/G019967/1).

PY - 2016

Y1 - 2016

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AB - 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.

U2 - 10.1039/c6em00179c

DO - 10.1039/c6em00179c

M3 - Article

VL - 18

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JO - Environmental Science: Processes and Impacts

JF - Environmental Science: Processes and Impacts

SN - 2050-7887

IS - 6

ER -