High plasticity of nitrogen fixation and denitrification of common coral reef substrates in response to nitrate availability

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http://hdl.handle.net/10138/332496

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El-Khaled , Y C , Nafeh , R , Roth , F , Rädecker , N , Karcher , D B , Jones , B H , Voolstra , C R & Wild , C 2021 , ' High plasticity of nitrogen fixation and denitrification of common coral reef substrates in response to nitrate availability ' , Marine Pollution Bulletin , vol. 168 , 112430 . https://doi.org/10.1016/j.marpolbul.2021.112430

Titel: High plasticity of nitrogen fixation and denitrification of common coral reef substrates in response to nitrate availability
Författare: El-Khaled, Yusuf C.; Nafeh, Rassil; Roth, Florian; Rädecker, Nils; Karcher, Denis B.; Jones, Burton H.; Voolstra, Christian R.; Wild, Christian
Upphovmannens organisation: Tvärminne Zoological Station
Biological stations
Datum: 2021-07
Språk: eng
Sidantal: 8
Tillhör serie: Marine Pollution Bulletin
ISSN: 0025-326X
DOI: https://doi.org/10.1016/j.marpolbul.2021.112430
Permanenta länken (URI): http://hdl.handle.net/10138/332496
Abstrakt: Nitrogen cycling in coral reefs may be affected by nutrient availability, but knowledge about concentrationdependent thresholds that modulate dinitrogen fixation and denitrification is missing. We determined the effects of different nitrate concentrations (ambient, 1, 5, 10 mu M nitrate addition) on both processes under two light scenarios (i.e., light and dark) using a combined acetylene assay for two common benthic reef substrates, i.e., turf algae and coral rubble. For both substrates, dinitrogen fixation rates peaked at 5 mu M nitrate addition in light, whereas denitrification was highest at 10 mu M nitrate addition in the dark. At 10 mu m nitrate addition in the dark, a near-complete collapse of dinitrogen fixation concurrent with a 76-fold increase in denitrification observed for coral rubble, suggesting potential threshold responses linked to the nutritional state of the community. We conclude that dynamic nitrogen cycling activity may help stabilise nitrogen availability in microbial communities associated with coral reef substrates.
Subject: Coral reefs
Nutrient pollution
Eutrophication
Nitrogen cycling
Turf algae
Coral rubble
DINITROGEN FIXATION
OXIDE REDUCTION
PHASE-SHIFTS
N-2 FIXATION
ACETYLENE INHIBITION
NUTRIENT ENRICHMENT
PRIMARY PRODUCERS
MICROBIAL MATS
RED-SEA
CYANOBACTERIA
1172 Environmental sciences
Referentgranskad: Ja
Licens: cc_by_nc_nd
Användningsbegränsning: openAccess
Parallelpublicerad version: publishedVersion


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