Phytoplankton responses to adaptive management interventions in eutrophic urban estuaries

The Science of the Total Environment
Daniel A LemleyCandice Bouland

Abstract

Upstream anthropogenic perturbations can dramatically affect estuarine water quality, especially in small systems where water retention times are high. Management of these modified ecosystems often requires direct interventions to prevent detrimental long-term effects. The heavily urbanized and temporarily closed Zandvlei Estuary in South Africa has a long history of anthropogenic manipulation, and therefore acts as an ideal case-study to gauge reactive management practices. Continued deterioration of estuarine water quality and ecological functioning prompted the adoption of an adaptive management approach. Subsequent management interventions to increase salinity variability and nutrient removal included the (1) adoption of a mouth management plan, (2) regular harvesting of submerged vegetation, and (3) removal of flow obstructions. Physico-chemical and nutrient monitoring data (2010-2018) were assessed to document the response of phytoplankton to these interventions. Time-series analysis indicated an upward trend in salinity throughout the estuary. This corresponded with a temporal decline in phytoplankton biomass levels and was supported by model results that highlighted a strongly inverse relationship with salinity. The fre...Continue Reading

Citations

Nov 3, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Gavin M RishworthHelmut Hillebrand
Jan 7, 2021·Environmental Science and Pollution Research International·Xinyi WangRui Cheng

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