Publication Date:
2023-03-03
Description:
We investigated the occurrence and activity of anaerobic ammonia oxidation (anammox) bacteria in sandy and muddy sand sediments of the southern North Sea. The presence of anammox bacteria was established through the detection of specific phosphocholine-monoether ladderane lipids, 16S rRNA gene, and hydrazine synthase (hzsA) genes. Anammox activity was measured in intact sediment cores (in situ rate) and in sediment slurries (potential rate) as the rate of N2 evolution from 15N-labeled substrates and compared to the transcriptional activity of genes of anammox bacteria. The contribution of anammox to N2 production ranged between 0% and 29%. The potential rate of anammox agreed well with the abundance of anammox bacteria 16S rRNA and hzsA gene copies and the transcriptional activity of the anammox bacteria 16S rRNA gene. We found a higher abundance and activity of anammox bacteria in sediments with higher organic carbon content and also higher activity in summer than in winter. The abundance of anammox bacteria and their potential anammox rates were similar to those reported for other marine coastal sediments, suggesting that potentially they are important contributors to the nitrogen cycle in sandy sediments of shallow continental shelf areas.
Keywords:
64PE327; 64PE327_1-MUC; 64PE327_4-MUC; 64PE327_6-MUC; 64PE327_7-MUC; 64PE329; 64PE329_1-MUC; 64PE329_4-MUC; 64PE329_6-MUC; 64PE329_7-MUC; 64PE337; 64PE337_1-MUC; 64PE337_4-MUC; 64PE337_6-MUC; 64PE337_7-MUC; 64PE343; 64PE343_1-MUC; 64PE343_4-MUC; 64PE343_6-MUC; 64PE343_7-MUC; Ammonium; Anammox 16s rRNA; Anammox 16s rRNA, standard deviation; Anammox rate; Anammox rate, standard deviation; Carbon, organic, total; CHARLET/NICYCLE; Cruise/expedition; Date/Time of event; DEPTH, sediment/rock; Elevation of event; Event label; Hydrazine synthase; Hydrazine synthase, standard deviation; Latitude of event; Longitude of event; Median, grain size; MUC; MultiCorer; NICYCLE/FOKUZ; NICYCLE/FOKUZ II; NICYCLE/FOKUZ III; Nitrate; Nitrite; Nitrogen production rate; North Sea; PC-monoether; PC-monoether, standard deviation; Pelagia; Phosphate; Salinity; Silicate; Size fraction 〈 0.063 mm, mud, silt+clay; Size fraction 0.125-0.063 mm, 3.0-4.0 phi, very fine sand; Size fraction 0.250-0.125 mm, 2.0-3.0 phi, fine sand; Size fraction 0.500-0.250 mm, 1.0-2.0 phi, medium sand; Station label
Type:
Dataset
Format:
text/tab-separated-values, 364 data points
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