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- W2547519098 abstract "ABSTRACT Many phototrophic flagellates ingest prokaryotes. This mixotrophic trait becomes a critical aspect of the microbial loop in planktonic food webs because of the typical high abundance of these flagellates. Our knowledge of their selective feeding upon different groups of prokaryotes, particularly under field conditions, is still quite limited. In this study, we investigated the feeding behavior of three species ( Rhodomonas sp., Cryptomonas ovata , and Dinobryon cylindricum ) via their food vacuole content in field populations of a high mountain lake. We used the catalyzed reporter deposition-fluorescence in situ hybridization (CARD-FISH) protocol with probes specific for the domain Archaea and three groups of Eubacteria : Betaproteobacteria , Actinobacteria , and Cytophaga-Flavobacteria of Bacteroidetes . Our results provide field evidence that contrasting selective feeding exists between coexisting mixotrophic flagellates under the same environmental conditions and that some prokaryotic groups may be preferentially impacted by phagotrophic pressure in aquatic microbial food webs. In our study, Archaea were the preferred prey, chiefly in the case of Rhodomonas sp., which rarely fed on any other prokaryotic group. In general, prey selection did not relate to prey size among the grazed groups. However, Actinobacteria , which were clearly avoided, mostly showed a size of <0.5 μm, markedly smaller than cells from the other groups. IMPORTANCE That mixotrophic flagellates are not randomly feeding in the main prokaryotic groups under field conditions is a pioneer finding in species-specific behavior that paves the way for future studies according to this new paradigm. The particular case that Archaea were preferentially affected in the situation studied shows that phagotrophic pressure cannot be disregarded when considering the distribution of this group in freshwater oligotrophic systems." @default.
- W2547519098 created "2016-11-11" @default.
- W2547519098 creator A5037563630 @default.
- W2547519098 creator A5082893649 @default.
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- W2547519098 date "2017-01-15" @default.
- W2547519098 modified "2023-10-17" @default.
- W2547519098 title "Some Mixotrophic Flagellate Species Selectively Graze on Archaea" @default.
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- W2547519098 doi "https://doi.org/10.1128/aem.02317-16" @default.
- W2547519098 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5203632" @default.
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