Lake restoration influences nutritional quality of algae and consequently Daphnia biomass
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RESTORATION OF EUTROPHIC LAKES
Lake restoration influences nutritional quality of algae and consequently Daphnia biomass S. J. Taipale K. Vuorio
. K. Kuoppama¨ki . U. Strandberg . E. Peltomaa .
Received: 31 July 2019 / Revised: 26 July 2020 / Accepted: 27 August 2020 The Author(s) 2020
Abstract Food quality is one of the key factors influencing zooplankton population dynamics. Eutrophication drives phytoplankton communities toward the dominance of cyanobacteria, which means a decrease in the availability of sterols and long-chain polyunsaturated fatty acids (EPA and DHA). The effects of different restoration measures on the nutritional quality of the phytoplankton community and subsequent impacts on zooplankton biomass have rarely been considered. We analyzed the nutritional Guest editors:Tom Jilbert, Raoul-Marie Couture, Brian J. Huser & Kalevi Salonen/Restoration of eutrophic lakes: current practices and future challenges
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10750-020-04398-5) contains supplementary material, which is available to authorized users. S. J. Taipale (&) Department of Biological and Environmental Science, University of Jyva¨skyla¨, Jyva¨skyla¨, Finland e-mail: [email protected] K. Kuoppama¨ki E. Peltomaa Faculty of Biological and Environmental Sciences, University of Helsinki, Lahti, Finland
quality of phytoplankton in the eutrophic Lake Vesija¨rvi in southern Finland over a 37-year period, and studied the impacts of two restoration measures, biomanipulation and hypolimnetic aeration, on the abundance of high-quality phytoplankton. We found that biomanipulation had a positive impact on the abundance of taxa synthesizing sterols, EPA, and DHA and, concurrently, on the biomass of the keystone species Daphnia. In contrast, hypolimnetic aeration did not result in such a beneficial outcome, manifested as a decrease in the abundance of Daphnia and frequent phytoplankton blooms dominated by cyanobacteria suggesting reduction in the nutritional quality of food for Daphnia. Our analysis shows that the determination of the nutritional value of algae and the contribution of essential fatty acids and sterols is
E. Peltomaa Lammi Biological Station, University of Helsinki, Lammi, Finland K. Vuorio Freshwater Centre, Finnish Environment Institute, Helsinki, Finland
U. Strandberg Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland
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Hydrobiologia
an effective method to evaluate the success of various restoration measures. Keywords Nutritional ecology Freshwater food webs Daphnia Fatty acids Sterols Amino acids Cryptophytes Cyanobacteria
Introduction Anthropogenic eutrophication of freshwaters is driven predominantly by phosphorus runoff from agricultural and urban lands (Carpenter, 2008) and typically results in high algal biomass and blooms consisting mainly of cyanobacteria (Jorgensen, 2001). Following tertiary wastewater treatm
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