A1 Journal article (refereed)
Eutrophication and browning influence Daphnia nutritional ecology (2019)

Taipale, S. J., Aalto, S. L., Galloway, A. W. E., Kuoppamäki, K., Nzobeuh, P., & Peltomaa, E. (2019). Eutrophication and browning influence Daphnia nutritional ecology. Inland Waters, 9(3), 374-394. https://doi.org/10.1080/20442041.2019.1574177

JYU authors or editors

Publication details

All authors or editors: Taipale, Sami J.; Aalto, Sanni L.; Galloway, Aaron W. E.; Kuoppamäki, Kirsi; Nzobeuh, Polain; Peltomaa, Elina

Journal or series: Inland Waters

ISSN: 2044-2041

eISSN: 2044-205X

Publication year: 2019

Volume: 9

Issue number: 3

Pages range: 374-394

Publisher: Taylor & Francis

Publication country: United Kingdom

Publication language: English

DOI: https://doi.org/10.1080/20442041.2019.1574177

Publication open access: Not open

Publication channel open access: 

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/66817

Abstract

Climate change and land-use practices can enhance lake eutrophication and browning, which influence phytoplankton composition by decreasing the availability of food high in nutritional quality (algae) and increasing the abundance of low-quality food (terrestrial detritus, bacteria) for herbivorous zooplankton. Nutritionally valuable algae for zooplankton are rich in essential biomolecules such as amino acids, polyunsaturated fatty acids (PUFAs), sterols, and phosphorus. We performed laboratory experiments and showed a stronger positive relationship between zooplankton (Daphnia) cumulative offspring number and availability of high-quality algae (Cryptophytes: Rhodomonas/Cryptomonas; and Chrysophytes: Mallomonas) than with intermediate-quality (Chlorophytes: Acutodesmus) or poor-quality (Dinoflagellates: Peridinium) algae. The higher cumulative offspring number of Daphnia was a result of higher amounts of total ω-3 and ω-6 PUFA, proteins, sterols, and amino acids in the algal diets. The experiments also showed that even a small addition of high-quality algae (Rhodomonas) to intermediate-quality (Acutodesmus) or low-quality (bacteria, heterotrophic nanoflagellates, or terrestrial organic matter) diets can enhance the Daphnia cumulative offspring production. Our carbon mass balance calculation for a eutrophic clearwater lake and an oligotrophic polyhumic lake showed that the abundance of high-quality phytoplankton (cryptophytes, chrysophytes, diatoms) among total particulate organic carbon was minor (8.7% [SD 2.4%] and 6.5% [7.0%]). We modeled Daphnia diets (i.e., resource assimilation) using a fatty acid mixing model. Our analyses showed that Daphnia were able to locate high-quality algae (cryptophytes, chrysophytes, and diatoms) more effectively during cyanobacteria blooms in a eutrophic lake (55% [SD 12%]) than in a polyhumic lake (25% [10%]). Nevertheless, our results show that intense eutrophication and browning diminish assimilation of high quality algae, limiting Daphnia biomass production.

Keywords: amino acids; bacteria; fatty acids; plankton

Free keywords: amino acids; bacteria; fatty acids; heteronanoflagellates; phytoplankton; polyunsaturated sterols; zooplankton

Contributing organizations

Ministry reporting: Yes

VIRTA submission year: 2019

JUFO rating: 1