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

Title: High plasticity of nitrogen fixation and denitrification of common coral reef substrates in response to nitrate availability
Author: El-Khaled, Yusuf C.; Nafeh, Rassil; Roth, Florian; Rädecker, Nils; Karcher, Denis B.; Jones, Burton H.; Voolstra, Christian R.; Wild, Christian
Contributor: University of Helsinki, Tvärminne Zoological Station
Date: 2021-07
Language: eng
Number of pages: 8
Belongs to series: Marine Pollution Bulletin
ISSN: 0025-326X
URI: http://hdl.handle.net/10138/332496
Abstract: 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
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