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dc.contributor.authorPtacnik, Robert-
dc.contributor.authorGomes, Ana-
dc.contributor.authorRoyer, S.-J.-
dc.contributor.authorCalbet, Albert-
dc.contributor.authorGasol, Josep M.-
dc.contributor.authorIsari, Stamatina-
dc.contributor.authorPitta, Paraskevi-
dc.identifierdoi: 10.1038/srep29286-
dc.identifierissn: 2045-2322-
dc.identifiere-issn: 2045-2322-
dc.identifier.citationScientific Reports 6: 29286 (2016)-
dc.descriptionPtacnik, Robert ... et al.-- 10 pages, 4 figures, 1 table, supplementary information https://dx.doi.org/10.1038/srep29286-
dc.description.abstractMixotrophs combine photosynthesis with phagotrophy to cover their demands in energy and essential nutrients. This gives them a competitive advantage under oligotropihc conditions, where nutrients and bacteria concentrations are low. As the advantage for the mixotroph depends on light, the competition between mixo- and heterotrophic bacterivores should be regulated by light. To test this hypothesis, we incubated natural plankton from the ultra-oligotrophic Eastern Mediterranean in a set of mesocosms maintained at 4 light levels spanning a 10-fold light gradient. Picoplankton (heterotrophic bacteria (HB), pico-sized cyanobacteria, and small-sized flagellates) showed the fastest and most marked response to light, with pronounced predator-prey cycles, in the high-light treatments. Albeit cell specific activity of heterotrophic bacteria was constant across the light gradient, bacterial abundances exhibited an inverse relationship with light. This pattern was explained by light-induced top-down control of HB by bacterivorous phototrophic eukaryotes (PE), which was evidenced by a significant inverse relationship between HB net growth rate and PE abundances. Our results show that light mediates the impact of mixotrophic bacterivores. As mixo- and heterotrophs differ in the way they remineralize nutrients, these results have far-reaching implications for how nutrient cycling is affected by light-
dc.description.sponsorshipThe experiment was financed by the European Union Seventh Framework Program MESOAQUA (FP7/2009-2013) coordinated by JCN under grant agreement no. 228224. R.P. further acknowledges financial support by the German Research Council (DFG Pt 5/3-1), JMG by Spanish project REMEI (CTM2015-70340) and AC by project PROTOS (CTM2009-08783) from the Spanish Ministry of Economy and Competitiveness-
dc.publisherNature Publishing Group-
dc.relation.isversionofPublisher's version-
dc.titleA light-induced shortcut in the planktonic microbial loop-
dc.description.versionPeer Reviewed-
dc.contributor.funderMinisterio de Economía y Competitividad (España)-
dc.contributor.funderGerman Research Foundation-
dc.contributor.funderEuropean Commission-
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