Ecophysiological analysis reveals distinct environmental preferences in closely related Baltic Sea picocyanobacteria.

Autor: Aguilera A; Department of Biology and Environmental Science, Centre for Ecology and Evolution in Microbial Model Systems (EEMiS), Linnaeus University, Kalmar, Sweden., Alegria Zufia J; Department of Biology and Environmental Science, Centre for Ecology and Evolution in Microbial Model Systems (EEMiS), Linnaeus University, Kalmar, Sweden., Bas Conn L; Department of Biology and Environmental Science, Centre for Ecology and Evolution in Microbial Model Systems (EEMiS), Linnaeus University, Kalmar, Sweden., Gurlit L; Department of Biology and Environmental Science, Centre for Ecology and Evolution in Microbial Model Systems (EEMiS), Linnaeus University, Kalmar, Sweden., Śliwińska-Wilczewska S; Mount Allison University, Sackville, New Brunswick, Canada.; Laboratory of Marine Plant Ecophysiology, Institute of Oceanography, University of Gdansk, Gdynia, Poland., Budzałek G; Laboratory of Marine Plant Ecophysiology, Institute of Oceanography, University of Gdansk, Gdynia, Poland., Lundin D; Department of Biology and Environmental Science, Centre for Ecology and Evolution in Microbial Model Systems (EEMiS), Linnaeus University, Kalmar, Sweden., Pinhassi J; Department of Biology and Environmental Science, Centre for Ecology and Evolution in Microbial Model Systems (EEMiS), Linnaeus University, Kalmar, Sweden., Legrand C; Department of Biology and Environmental Science, Centre for Ecology and Evolution in Microbial Model Systems (EEMiS), Linnaeus University, Kalmar, Sweden.; School of Business, Innovation and Sustainability, Halmstad University, Halmstad, Sweden., Farnelid H; Department of Biology and Environmental Science, Centre for Ecology and Evolution in Microbial Model Systems (EEMiS), Linnaeus University, Kalmar, Sweden.
Jazyk: angličtina
Zdroj: Environmental microbiology [Environ Microbiol] 2023 Sep; Vol. 25 (9), pp. 1674-1695. Date of Electronic Publication: 2023 Apr 17.
DOI: 10.1111/1462-2920.16384
Abstrakt: Cluster 5 picocyanobacteria significantly contribute to primary productivity in aquatic ecosystems. Estuarine populations are highly diverse and consist of many co-occurring strains, but their physiology remains largely understudied. In this study, we characterized 17 novel estuarine picocyanobacterial strains. Phylogenetic analysis of the 16S rRNA and pigment genes (cpcB and cpeBA) uncovered multiple estuarine and freshwater-related clusters and pigment types. Assays with five representative strains (three phycocyanin rich and two phycoerythrin rich) under temperature (10-30°C), light (10-190 μmol photons m -2  s -1 ), and salinity (2-14 PSU) gradients revealed distinct growth optima and tolerance, indicating that genetic variability was accompanied by physiological diversity. Adaptability to environmental conditions was associated with differential pigment content and photosynthetic performance. Amplicon sequence variants at a coastal and an offshore station linked population dynamics with phylogenetic clusters, supporting that strains isolated in this study represent key ecotypes within the Baltic Sea picocyanobacterial community. The functional diversity found within strains with the same pigment type suggests that understanding estuarine picocyanobacterial ecology requires analysis beyond the phycocyanin and phycoerythrin divide. This new knowledge of the environmental preferences in estuarine picocyanobacteria is important for understanding and evaluating productivity in current and future ecosystems.
(© 2023 The Authors. Environmental Microbiology published by Applied Microbiology International and John Wiley & Sons Ltd.)
Databáze: MEDLINE
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