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Sökning: (WFRF:(Voolstra Christian R.)) > (2020-2022) > In situ eutrophicat...

  • El-Khaled, Yusuf C. (författare)

In situ eutrophication stimulates dinitrogen fixation, denitrification, and productivity in Red Sea coral reefs

  • Artikel/kapitelEngelska2020

Förlag, utgivningsår, omfång ...

  • Inter-Research Science Center,2020
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:su-192827
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-192827URI
  • https://doi.org/10.3354/meps13352DOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • Eutrophication (i.e. the increase of [in-]organic nutrients) may affect the functioning of coral reefs, but knowledge about the effects on nitrogen (N) cycling and its relationship to productivity within benthic reef communities is scarce. Thus, we investigated how in situ manipulated eutrophication impacted productivity along with 2 counteracting N-cycling pathways (dinitrogen [N-2]fixation, denitrification), using a combined acetylene assay. We hypothesised that N-2-fixation would decrease and denitrification increase in response to eutrophication. N fluxes and productivity (measured as dark and light oxygen fluxes assessed in incubation experiments) were determined for 3 dominant coral reef functional groups (reef sediments, turf algae, and the scleractinian coral Pocillo-pora verrucosa) after 8 wk of in situ nutrient enrichment in the central Red Sea. Using slow-release fertiliser, we increased the dissolved inorganic N concentration by up to 7-fold compared to ambient concentrations. Experimental nutrient enrichment stimulated both N-2-fixation and denitrification across all functional groups 2- to 7-fold and 2- to 4-fold, respectively. Productivity doubled in reef sediments and remained stable for turf algae and P. verrucosa. Our data therefore suggest that (1) turf algae are major N-2-fixers in coral reefs, while denitrification is widespread among all investigated groups; (2) surprisingly, and contrary to our hypothesis, both N-2-fixation and denitrification are involved in the response to moderate N eutrophication, and (3) stimulated N-2-fixation and denitrification are not directly influenced by productivity. Our findings underline the importance and ubiquity of microbial N cycling in (Red Sea) coral reefs along with its sensitivity to eutrophication.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Roth, FlorianStockholms universitet,Stockholms universitets Östersjöcentrum,King Abdullah University of Science and Technology (KAUST), Saudi-Arabia; University of Helsinki, Finland(Swepub:su)flro3057 (författare)
  • Tilstra, Arjen (författare)
  • Rädecker, Nils (författare)
  • Karcher, Denis B. (författare)
  • Kürten, Benjamin (författare)
  • Jones, Burton H. (författare)
  • Voolstra, Christian R. (författare)
  • Wild, Christian (författare)
  • Stockholms universitetStockholms universitets Östersjöcentrum (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Marine Ecology Progress Series: Inter-Research Science Center645, s. 55-660171-86301616-1599

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