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• W2892085223 abstract "Abstract Periphyton plays a vital ecological role in shallow, well-lit ecosystems which are vulnerable to rapidly changing environmental conditions, including raising temperature due to global warming. Nevertheless, little is known on the effect of increased temperatures on the taxonomic structure and functioning of periphytic communities. In this study, the influence of short-term temperature increase on the species composition and photosynthetic activity of the Baltic periphytic communities was investigated. The collected communities were exposed to increased temperature of 23 °C (ca. 4 °C above the summer average) for 72 h. After this time, species composition of the communities was studied under light microscope and their photosynthetic performance was evaluated using PAM fluorometry. Results showed that the biomass of cyanobacteria slightly increased. There were significant changes in the abundance of diatom species, among which Fragilaria fasciculata and Navicula ramosissima , were negatively affected by the elevated temperature and their cell number significantly decreased, whereas, Diatoma moniliformis and N. perminuta were stimulated by the increased temperature. Additionally, a shift towards higher abundance of smaller taxa was also observed. The higher quantum yield of photosystem II (PSII) (higher Φ PSII) accompanied by the lower value of non-photochemical quenching (NPQ) observed in communities kept at 23 °C showed more efficient photosynthesis. This was further confirmed by the changes in rapid light curves (higher photosynthetic capacity, rETR max , and photoacclimation index, E k ). The obtained data constitute evidence that short periods of increased temperature significantly affect the structure and functioning of the Baltic periphyton." @default.
• W2892085223 created "2018-09-27" @default.
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• W2892085223 date "2018-09-13" @default.
• W2892085223 modified "2023-09-23" @default.
• W2892085223 title "Influence of short periods of increased water temperature on species composition and photosynthetic activity in the Baltic periphyton communities" @default.
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• W2892085223 doi "https://doi.org/10.2478/s11756-018-0122-6" @default.
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