Temperature, phosphorus and species composition will all influence phytoplankton production and content of polyunsaturated fatty acids.

Autor:	Calderini ML; Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35 FI-40014, Jyväskylä, Finland., Pääkkönen S; Spectral Imaging Laboratory, Faculty of Information Technology, University of Jyväskylä, P.O. BOX 35 FI-40014, Jyväskylä Finland., Salmi P; Spectral Imaging Laboratory, Faculty of Information Technology, University of Jyväskylä, P.O. BOX 35 FI-40014, Jyväskylä Finland., Peltomaa E; Department of Forest Sciences, University of Helsinki, P.O. Box 27 FI-00014, Helsinki, Finland., Taipale SJ; Department of Biological and Environmental Science, University of Jyväskylä, P.O. BOX 35 FI-40014, Jyväskylä, Finland.
Jazyk:	angličtina
Zdroj:	Journal of plankton research [J Plankton Res] 2023 Jun 24; Vol. 45 (4), pp. 625-635. Date of Electronic Publication: 2023 Jun 24 (Print Publication: 2023).
DOI:	10.1093/plankt/fbad026
Abstrakt:	Temperature increases driven by climate change are expected to decrease the availability of polyunsaturated fatty acids in lakes worldwide. Nevertheless, a comprehensive understanding of the joint effects of lake trophic status, nutrient dynamics and warming on the availability of these biomolecules is lacking. Here, we conducted a laboratory experiment to study how warming (18-23°C) interacts with phosphorus (0.65-2.58 μM) to affect phytoplankton growth and their production of polyunsaturated fatty acids. We included 10 species belonging to the groups diatoms, golden algae, cyanobacteria, green algae, cryptophytes and dinoflagellates. Our results show that both temperature and phosphorus will boost phytoplankton growth, especially stimulating certain cyanobacteria species ( Microcystis sp.). Temperature and phosphorus had opposing effects on polyunsaturated fatty acid proportion, but responses are largely dependent on species. Eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) synthesizing species did not clearly support the idea that warming decreases the production or content of these essential polyunsaturated fatty acids. Our results suggest that warming may have different effects on the polyunsaturated fatty acid availability in lakes with different nutrient levels, and that different species within the same phytoplankton group can have contrasting responses to warming. Therefore, we conclude that future production of EPA and DHA is mainly determined by species composition. (© The Author(s) 2023. Published by Oxford University Press.)
Databáze:	MEDLINE
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