![]() Denitrification rates were positively correlated with N 2 fixation rates and Symbiodiniaceae cell densities. In concordance, highest denitrification rates were measured in A. We found that relative abundances of the nirS gene were 16- and 17-fold higher in A. In addition, dinitrogen (N 2) fixation rates, Symbiodiniaceae cell density, and oxygen evolution were assessed to provide an environmental context for denitrification. ![]() Relative nirS gene copy numbers associated with the tissues of these common corals were assessed and compared with denitrification rates on the holobiont level. The present study used the nirS marker gene as a proxy for denitrification potential along with measurements of denitrification rates in a comparative coral taxonomic framework from the Red Sea: Acropora hemprichii, Millepora dichotoma, and Pleuractis granulosa. However, little is known about the abundance and activity of denitrifiers in the coral holobiont. Denitrification may potentially alleviate excess nitrogen (N) availability in coral holobionts to maintain a favourable N to phosphorous ratio in the coral tissue.
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