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• W2125131740 abstract "Mixotrophic nanoflagellates, that combine photosynthesis and phagotrophy, are important members of planktonic food webs in many aquatic environments depending on the balance among the different carbon and energy sources. We carried out field sampling and laboratory experiments with natural nanoflagellate assemblages from an Andean North-Patagonian lake exposing them or not to UVR, and measuring photosynthetic parameters and bacterivory. The effect of different light treatments on the photosynthetic efficiency was studied by the non-invasive, pulse amplitude-modulated (PAM) fluorescence technique, and bacterivory was assessed with fluorescently labeled bacteria (FLB). Mixotrophic nanoflagellates were clearly dominant (up to 90% of total phytoplankton and 88% of total nanoflagellate abundance), and in the experiments labeled bacteria were observed in more than 75% of mixotrophic cells. These results support the idea that these phytoflagellates were never entirely photosynthetic. The high light : phosphorus ratio and the high C : N : P ratio suggest a strong nutrient limitation towards P. Our results show that both functions, photosynthesis and bacteria ingestion, were simultaneously reduced by the same level of UVR. We estimated that UVR exposure of mixotrophic nanoflagellates reduced photosystem II activity between 23% and 31% while ingestion rates were reduced between 23% and 28%. Therefore, our results suggest that the different cell functions could be concurrently impacted by UVR, implying that patterns and rates of C transfer would be substantially altered in the microbial food web." @default.
• W2125131740 created "2016-06-24" @default.
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• W2125131740 date "2011-08-01" @default.
• W2125131740 modified "2023-10-06" @default.
• W2125131740 title "UV radiation simultaneously affects phototrophy and phagotrophy in nanoflagellate-dominated phytoplankton from an Andean shallow lake" @default.
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• W2125131740 doi "https://doi.org/10.1039/c1pp05010a" @default.
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