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dc.contributor.authorTilstra, Arjen
dc.contributor.authorRoth, Florian
dc.contributor.authorEl-Khaled, Yusuf C.
dc.contributor.authorPogoreutz, Claudia
dc.contributor.authorRädecker, Nils
dc.contributor.authorVoolstra, Christian R.
dc.contributor.authorWild, Christian
dc.date.accessioned2021-06-03T09:10:28Z
dc.date.available2021-06-03T09:10:28Z
dc.date.issued2021-06-02
dc.date.submitted20202-10-15
dc.identifier.citationTilstra, A., Roth, F., El-Khaled, Y. C., Pogoreutz, C., Rädecker, N., Voolstra, C. R., & Wild, C. (2021). Relative abundance of nitrogen cycling microbes in coral holobionts reflects environmental nitrate availability. Royal Society Open Science, 8(6), 201835. doi:10.1098/rsos.201835
dc.identifier.issn2054-5703
dc.identifier.doi10.1098/rsos.201835
dc.identifier.urihttp://hdl.handle.net/10754/669363
dc.description.abstractRecent research suggests that nitrogen (N) cycling microbes are important for coral holobiont functioning. In particular, coral holobionts may acquire bioavailable N via prokaryotic dinitrogen (N2) fixation or remove excess N via denitrification activity. However, our understanding of environmental drivers on these processes in hospite remains limited. Employing the strong seasonality of the central Red Sea, this study assessed the effects of environmental parameters on the proportional abundances of N cycling microbes associated with the hard corals Acropora hemprichii and Stylophora pistillata. Specifically, we quantified changes in the relative ratio between nirS and nifH gene copy numbers, as a proxy for seasonal shifts in denitrification and N2 fixation potential in corals, respectively. In addition, we assessed coral tissue-associated Symbiodiniaceae cell densities and monitored environmental parameters to provide a holobiont and environmental context, respectively. While ratios of nirS to nifH gene copy numbers varied between seasons, they revealed similar seasonal patterns in both coral species, with ratios closely following patterns in environmental nitrate availability. Symbiodiniaceae cell densities aligned with environmental nitrate availability, suggesting that the seasonal shifts in nirS to nifH gene abundance ratios were probably driven by nitrate availability in the coral holobiont. Thereby, our results suggest that N cycling in coral holobionts probably adjusts to environmental conditions by increasing and/or decreasing denitrification and N2 fixation potential according to environmental nitrate availability. Microbial N cycling may, thus, extenuate the effects of changes in environmental nitrate availability on coral holobionts to support the maintenance of the coral–Symbiodiniaceae symbiosis.
dc.description.sponsorshipWe thank KAUST CMOR staff and boat crews for their support with diving operations. We thank Nauras Daraghmeh for his support with re-analysing environmental parameter data.
dc.description.sponsorshipFinancial support was provided by KAUST baseline funds to C.R. Voolstra and the German Research Foundation (DFG) grant nos. Wi 2677/9-1 and Wi 2677/16-1 to C.W.
dc.publisherThe Royal Society
dc.relation.urlhttps://royalsocietypublishing.org/doi/10.1098/rsos.201835
dc.rights© 2021 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License, which permits unrestricted use, provided the original author and source are credited.
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.titleRelative abundance of nitrogen cycling microbes in coral holobionts reflects environmental nitrate availability
dc.typeArticle
dc.contributor.departmentMarine Science Program
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentRed Sea Research Center (RSRC)
dc.identifier.journalRoyal Society Open Science
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionMarine Ecology Department, Faculty of Biology and Chemistry, University of Bremen, Bremen, Germany
dc.contributor.institutionBaltic Sea Centre, Stockholm University, Stockholm, Sweden
dc.contributor.institutionTvärminne Zoological Station, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland
dc.contributor.institutionDepartment of Biology, University of Konstanz, Konstanz, Germany
dc.contributor.institutionLaboratory for Biological Geochemistry, School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
dc.identifier.volume8
dc.identifier.issue6
dc.identifier.pages201835
kaust.personRoth, Florian
kaust.personPogoreutz, Claudia
kaust.personRadecker, Nils
kaust.personVoolstra, Christian R.
dc.date.accepted2021-05-14
refterms.dateFOA2021-06-03T09:19:16Z
kaust.acknowledged.supportUnitCMOR staff
kaust.acknowledged.supportUnitBaseline funds


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© 2021 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License, which permits
unrestricted use, provided the original author and source are credited.
Except where otherwise noted, this item's license is described as © 2021 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License, which permits unrestricted use, provided the original author and source are credited.