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Biomarker evidence of macrophyte and plankton community changes in Zeekoevlei, a shallow lake in South Africa

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Abstract

Zeekoevlei is the largest freshwater lake in South Africa and has a century-long history of anthropogenic impact that caused hyper-eutrophic conditions. We used biomarkers (alkanes and pigments), stable isotopes (δ13C and δ15N), rates of primary palaeoproduction and total inorganic carbon (TIC) accumulation rates in the lake sediments to investigate changes in plankton and macrophyte communities in response to anthropogenic activities in this shallow lake. Specific alkanes (ΣC15,17,19, pristane, phytane and n-C29/n-C17 ratio) and pigment (chlorophyll a, β,β-carotene, echinenone, fucoxanthin and zeaxanthin) concentrations in lake waters indicated the present-day hyper-eutrophic condition and seasonal fluctuations of cyanobacteria, zooplankton and diatom populations. Eutrophic conditions were initiated in the lake with the start of recreational activities and construction of a sewage treatment plant in the early 1920s. The lake transformed from a eutrophic to a hyper-eutrophic waterbody following damming, pondweed eradication and accelerated catchment-derived nutrient input. The change in lake trophic state was recorded by a sharp decline in the terrestrial to aquatic ratio (TAR) of specific n-alkanes, low carbon preference index (CPI) and increased δ13C values in the sediment core. In addition, the aquatic macrophyte n-alkane proxy (Paq) values (~1) indicated a slow takeover by floating macrophytes after the eradication of submerged pondweeds in 1951. Elevated n-alkane (ΣC15,17,19), total alkane and pigment (chlorophyll a, β,β-carotene, zeaxanthin and zeaxanthin to β,β-carotene ratio) concentrations, low δ15N values and low TIC accumulation rates in the upper middle section of the core indicated the beginning of intense cyanobacterial blooms after the dredging in 1983. Although the cyanobacterial population has decreased in recent years, hyper-eutrophic conditions are reflected by low CPI <0.04 and TAR <1 values at the top of the sediment core.

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Acknowledgements

The authors gratefully acknowledge the financial support of SIDA–NRF for this study. Dalton Gibbs of Rondevlei Nature Reserve is acknowledged for providing the background information on Zeekoevlei. Thomas Bianchi and Jürgen Rullkötter are acknowledged for reviewing an earlier version of the manuscript. Suggestions from two anonymous reviewers improved the manuscript. This is AEON contribution number 52.

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  1. Department of Geology and Geochemistry, Stockholm University, Stockholm, 10691, Sweden

    Supriyo Kumar Das & Joyanto Routh

  2. Department of Geological Sciences, University of Cape Town, Rondebosch, 7700, South Africa

    Alakendra N. Roychoudhury

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  1. Supriyo Kumar Das
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Correspondence to Supriyo Kumar Das.

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Das, S.K., Routh, J. & Roychoudhury, A.N. Biomarker evidence of macrophyte and plankton community changes in Zeekoevlei, a shallow lake in South Africa. J Paleolimnol 41, 507–521 (2009). https://doi.org/10.1007/s10933-008-9241-3

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