Lake restoration influences nutritional quality of algae and consequently Daphnia biomass

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Taipale , S J , Kuoppamaki , K , Strandberg , U , Peltomaa , E & Vuorio , K 2020 , ' Lake restoration influences nutritional quality of algae and consequently Daphnia biomass ' , Hydrobiologia , vol. 847 , no. 21 , pp. 4539-4557 . https://doi.org/10.1007/s10750-020-04398-5

Title: Lake restoration influences nutritional quality of algae and consequently Daphnia biomass
Author: Taipale, S. J.; Kuoppamaki, K.; Strandberg, U.; Peltomaa, E.; Vuorio, K.
Contributor: University of Helsinki, Environmental Sciences
University of Helsinki, Department of Forest Sciences
Date: 2020-12
Language: eng
Number of pages: 19
Belongs to series: Hydrobiologia
ISSN: 0018-8158
URI: http://hdl.handle.net/10138/326654
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 quality of phytoplankton in the eutrophic Lake Vesijarvi 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 speciesDaphnia. In contrast, hypolimnetic aeration did not result in such a beneficial outcome, manifested as a decrease in the abundance ofDaphniaand frequent phytoplankton blooms dominated by cyanobacteria suggesting reduction in the nutritional quality of food forDaphnia. Our analysis shows that the determination of the nutritional value of algae and the contribution of essential fatty acids and sterols is an effective method to evaluate the success of various restoration measures.
Subject: Nutritional ecology
Freshwater food webs
Daphnia
Fatty acids
Sterols
Amino acids
Cryptophytes
Cyanobacteria
FRESH-WATER HERBIVORE
FATTY-ACID CONTENT
TROPHIC TRANSFER
PHYTOPLANKTON
DAPHNIA
BIOMANIPULATION
EUTROPHICATION
PHOSPHORUS
FISH
LONG
1181 Ecology, evolutionary biology
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