Nitrogen fixation and denitrification activity differ between coral- and algae-dominated Red Sea reefs

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dc.contributor.author El-Khaled, Yusuf C.
dc.contributor.author Roth, Florian
dc.contributor.author Rädecker, Nils
dc.contributor.author Tilstra, Arjen
dc.contributor.author Karcher, Denis B.
dc.contributor.author Kurten, Benjamin
dc.contributor.author Jones, Burton H.
dc.contributor.author Voolstra, Christian R.
dc.contributor.author Wild, Christian
dc.date.accessioned 2021-07-23T12:00:01Z
dc.date.available 2021-07-23T12:00:01Z
dc.date.issued 2021-06-03
dc.identifier.citation El-Khaled , Y C , Roth , F , Rädecker , N , Tilstra , A , Karcher , D B , Kurten , B , Jones , B H , Voolstra , C R & Wild , C 2021 , ' Nitrogen fixation and denitrification activity differ between coral- and algae-dominated Red Sea reefs ' , Scientific Reports , vol. 11 , no. 1 , 11820 . https://doi.org/10.1038/s41598-021-90204-8
dc.identifier.other PURE: 166868089
dc.identifier.other PURE UUID: bcdc3828-d386-47f3-be42-96fe6cbcf7ed
dc.identifier.other WOS: 000662236000115
dc.identifier.other ORCID: /0000-0003-4004-5863/work/97417878
dc.identifier.uri http://hdl.handle.net/10138/332542
dc.description.abstract Coral reefs experience phase shifts from coral- to algae-dominated benthic communities, which could affect the interplay between processes introducing and removing bioavailable nitrogen. However, the magnitude of such processes, i.e., dinitrogen (N-2) fixation and denitrification levels, and their responses to phase shifts remain unknown in coral reefs. We assessed both processes for the dominant species of six benthic categories (hard corals, soft corals, turf algae, coral rubble, biogenic rock, and reef sands) accounting for>98% of the benthic cover of a central Red Sea coral reef. Rates were extrapolated to the relative benthic cover of the studied organisms in co-occurring coral- and algae-dominated areas of the same reef. In general, benthic categories with high N-2 fixation exhibited low denitrification activity. Extrapolated to the respective reef area, turf algae and coral rubble accounted for>90% of overall N-2 fixation, whereas corals contributed to more than half of reef denitrification. Total N-2 fixation was twice as high in algae- compared to coral-dominated areas, whereas denitrification levels were similar. We conclude that algae-dominated reefs promote new nitrogen input through enhanced N-2 fixation and comparatively low denitrification. The subsequent increased nitrogen availability could support net productivity, resulting in a positive feedback loop that increases the competitive advantage of algae over corals in reefs that experienced a phase shift. en
dc.format.extent 15
dc.language.iso eng
dc.relation.ispartof Scientific Reports
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject SHADE-ADAPTED COLONIES
dc.subject GREAT-BARRIER-REEF
dc.subject ACETYLENE-REDUCTION
dc.subject PHASE-SHIFTS
dc.subject DINITROGEN FIXATION
dc.subject SOFT CORALS
dc.subject NUTRIENT ENRICHMENT
dc.subject OXIDE REDUCTION
dc.subject CLIMATE-CHANGE
dc.subject FISH COMMUNITIES
dc.subject 1172 Environmental sciences
dc.title Nitrogen fixation and denitrification activity differ between coral- and algae-dominated Red Sea reefs en
dc.type Article
dc.contributor.organization Tvärminne Zoological Station
dc.contributor.organization Biological stations
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1038/s41598-021-90204-8
dc.relation.issn 2045-2322
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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