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dc.contributor.authorPtacnik, Robert
dc.contributor.authorGomes, Ana
dc.contributor.authorRoyer, Sarah-Jeanne
dc.contributor.authorBerger, Stella A.
dc.contributor.authorCalbet, Albert
dc.contributor.authorNejstgaard, Jens C.
dc.contributor.authorGasol, Josep M.
dc.contributor.authorIsari, Stamatina
dc.contributor.authorMoorthi, Stefanie D.
dc.contributor.authorPtacnikova, Radka
dc.contributor.authorStriebel, Maren
dc.contributor.authorSazhin, Andrey F.
dc.contributor.authorTsagaraki, Tatiana M.
dc.contributor.authorZervoudaki, Soultana
dc.contributor.authorAltoja, Kristi
dc.contributor.authorDimitriou, Panagiotis D.
dc.contributor.authorLaas, Peeter
dc.contributor.authorGazihan, Ayse
dc.contributor.authorMartínez, Rodrigo A.
dc.contributor.authorSchabhüttl, Stefanie
dc.contributor.authorSanti, Ioulia
dc.contributor.authorSousoni, Despoina
dc.contributor.authorPitta, Paraskevi
dc.date.accessioned2016-07-18T10:00:33Z
dc.date.available2016-07-18T10:00:33Z
dc.date.issued2016-07-11
dc.identifier.citationA light-induced shortcut in the planktonic microbial loop 2016, 6:29286 Scientific Reports
dc.identifier.issn2045-2322
dc.identifier.pmid27404551
dc.identifier.doi10.1038/srep29286
dc.identifier.urihttp://hdl.handle.net/10754/617092
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. MESOAQUA granted Transnational Access to R. & R.P., S.D.M., M.S., S.S., A.G., K.A., P.L. (LightDynaMix), A.C., R.A.M., A.S., A.G., S.J.R., J.M.G. (LiMic) and S.I., S.Z. (LightCopFed). 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. T. Tanaka is highly acknowledged for contributing his data on phosphorus uptake and bacterial activity. The authors wish to thank Dr. P. Divanach for valuable advice on technical matters, G. Piperakis for his inspired technical assistance throughout the experiment, S. Zivanovic and E. Dafnomili for assistance with chemical analyses, D. Podaras for assistance during the experiment and N. Sekeris for his help with constructions and ideas. The captain and the crew of the R/V Philia are also thanked for their assistance during the transportation of water from the sea to the mesocosms. Comments by three anonymous reviewers have helped improving the manuscript.
dc.language.isoen
dc.publisherSpringer Nature
dc.relation.urlhttp://www.nature.com/articles/srep29286
dc.rightsThis work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
dc.titleA light-induced shortcut in the planktonic microbial loop
dc.typeArticle
dc.contributor.departmentRed Sea Research Center (RSRC)
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.identifier.journalScientific Reports
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionICBM, University of Oldenburg, Schleusenstrasse 1, DE-26382 Wilhelmshaven, Oldenburg, Germany
dc.contributor.institutionWasserCluster Lunz - Biologische Station GmbH, Dr Carl Kupelwieser Promenade 5, A-3293 Lunz am See, Austria
dc.contributor.institutionInstitut de Ciències del Mar, CSIC, Pg Marítim de la Barceloneta, 37-49, 08003 Barcelona, Catalunya, Spain
dc.contributor.institutionDepartment of Biology, University of Bergen, P.O. Box 7803, 5020 Bergen, Norway
dc.contributor.institutionLeibniz Institute of Freshwater Ecology and Inland Fisheries, Dep. 3, Experimental Limnology, Alte Fischerhütte 2, 16775 Stechlin, Germany
dc.contributor.institutionEuropean Institute for Marine Studies, Technopole Brest-Iroise, Plouzane, France
dc.contributor.institutionP.P. Shirshov Institute of Oceanology RAS, 36 Nahimovski prospect, 117997 Moscow, Russia
dc.contributor.institutionInstitute of Oceanography, Hellenic Centre for Marine Research, P.O. Box 2214, 71003 Heraklion, Crete, Greece
dc.contributor.institutionInstitute of Oceanography, Hellenic Centre for Marine Research, P.O. Box 712, 19013 Anavyssos, Greece
dc.contributor.institutionMarine Systems Institute at Tallinn University of Technology, Akadeemia Rd. 15A, 12618 Tallinn, Estonia
dc.contributor.institutionDepartment of Biology, University of Crete, Voutes University Campus, 70013 Heraklion, Crete, Greece
dc.contributor.institutionMiddle East Technical University, Institute of Marine Sciences, P.O. Box 28, 33731, Erdemli, Mersin, Turkey
dc.contributor.institutionDepartment of Limnology, University of Vienna, Althanstrasse 14, 1090, Vienna, AT.
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)
kaust.personIsari, Stamatina
refterms.dateFOA2018-06-13T11:42:47Z
dc.date.published-online2016-07-11
dc.date.published-print2016-09


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