A light-induced shortcut in the planktonic microbial loop

Handle URI:
http://hdl.handle.net/10754/617092
Title:
A light-induced shortcut in the planktonic microbial loop
Authors:
Ptacnik, Robert; Gomes, Ana; Royer, Sarah-Jeanne; Berger, Stella A.; Calbet, Albert; Nejstgaard, Jens C.; Gasol, Josep M.; Isari, Stamatina ( 0000-0003-3457-0274 ) ; Moorthi, Stefanie D.; Ptacnikova, Radka; Striebel, Maren; Sazhin, Andrey F.; Tsagaraki, Tatiana M.; Zervoudaki, Soultana; Altoja, Kristi; Dimitriou, Panagiotis D.; Laas, Peeter; Gazihan, Ayse; Martínez, Rodrigo A.; Schabhüttl, Stefanie; Santi, Ioulia; Sousoni, Despoina; Pitta, Paraskevi
Abstract:
Mixotrophs 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.
KAUST Department:
Red Sea Research Center (RSRC); Biological and Environmental Sciences and Engineering (BESE) Division
Citation:
A light-induced shortcut in the planktonic microbial loop 2016, 6:29286 Scientific Reports
Publisher:
Springer Nature
Journal:
Scientific Reports
Issue Date:
11-Jul-2016
DOI:
10.1038/srep29286
Type:
Article
ISSN:
2045-2322
Sponsors:
The 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.
Additional Links:
http://www.nature.com/articles/srep29286
Appears in Collections:
Articles

Full metadata record

DC FieldValue Language
dc.contributor.authorPtacnik, Roberten
dc.contributor.authorGomes, Anaen
dc.contributor.authorRoyer, Sarah-Jeanneen
dc.contributor.authorBerger, Stella A.en
dc.contributor.authorCalbet, Alberten
dc.contributor.authorNejstgaard, Jens C.en
dc.contributor.authorGasol, Josep M.en
dc.contributor.authorIsari, Stamatinaen
dc.contributor.authorMoorthi, Stefanie D.en
dc.contributor.authorPtacnikova, Radkaen
dc.contributor.authorStriebel, Marenen
dc.contributor.authorSazhin, Andrey F.en
dc.contributor.authorTsagaraki, Tatiana M.en
dc.contributor.authorZervoudaki, Soultanaen
dc.contributor.authorAltoja, Kristien
dc.contributor.authorDimitriou, Panagiotis D.en
dc.contributor.authorLaas, Peeteren
dc.contributor.authorGazihan, Ayseen
dc.contributor.authorMartínez, Rodrigo A.en
dc.contributor.authorSchabhüttl, Stefanieen
dc.contributor.authorSanti, Iouliaen
dc.contributor.authorSousoni, Despoinaen
dc.contributor.authorPitta, Paraskevien
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 Reportsen
dc.identifier.issn2045-2322-
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.en
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.en
dc.language.isoenen
dc.publisherSpringer Natureen
dc.relation.urlhttp://www.nature.com/articles/srep29286en
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/en
dc.titleA light-induced shortcut in the planktonic microbial loopen
dc.typeArticleen
dc.contributor.departmentRed Sea Research Center (RSRC)en
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.identifier.journalScientific Reportsen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionICBM, University of Oldenburg, Schleusenstrasse 1, DE-26382 Wilhelmshaven, Oldenburg, Germanyen
dc.contributor.institutionWasserCluster Lunz - Biologische Station GmbH, Dr Carl Kupelwieser Promenade 5, A-3293 Lunz am See, Austriaen
dc.contributor.institutionInstitut de Ciències del Mar, CSIC, Pg Marítim de la Barceloneta, 37-49, 08003 Barcelona, Catalunya, Spainen
dc.contributor.institutionDepartment of Biology, University of Bergen, P.O. Box 7803, 5020 Bergen, Norwayen
dc.contributor.institutionLeibniz Institute of Freshwater Ecology and Inland Fisheries, Dep. 3, Experimental Limnology, Alte Fischerhütte 2, 16775 Stechlin, Germanyen
dc.contributor.institutionEuropean Institute for Marine Studies, Technopole Brest-Iroise, Plouzane, Franceen
dc.contributor.institutionP.P. Shirshov Institute of Oceanology RAS, 36 Nahimovski prospect, 117997 Moscow, Russiaen
dc.contributor.institutionInstitute of Oceanography, Hellenic Centre for Marine Research, P.O. Box 2214, 71003 Heraklion, Crete, Greeceen
dc.contributor.institutionInstitute of Oceanography, Hellenic Centre for Marine Research, P.O. Box 712, 19013 Anavyssos, Greeceen
dc.contributor.institutionMarine Systems Institute at Tallinn University of Technology, Akadeemia Rd. 15A, 12618 Tallinn, Estoniaen
dc.contributor.institutionDepartment of Biology, University of Crete, Voutes University Campus, 70013 Heraklion, Crete, Greeceen
dc.contributor.institutionMiddle East Technical University, Institute of Marine Sciences, P.O. Box 28, 33731, Erdemli, Mersin, Turkeyen
dc.contributor.institutionDepartment of Limnology, University of Vienna, Althanstrasse 14, 1090, Vienna, AT.en
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorIsari, Stamatinaen
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