We also show that the microbial community structure in this Arctic polar desert is shaped by pH and redox gradients. High-throughput amplicon sequencing of the 16S rRNA gene uncovered a community dominated by Proteobacteria, Bacteroidetes, and Chloroflexi, similar to those found in other cold and oligotrophic lake sediments. To address these gaps, we surveyed the biologically active surface sediments in Lake Hazen, the largest lake by volume north of the Arctic Circle, and a small lake and shoreline pond in its watershed.
#Automatic waterroof water system drivers
However, the microbial communities in such Arctic environments have seldom been studied, and the drivers of their composition are poorly characterized. The Arctic is undergoing rapid environmental change, potentially affecting the physicochemical constraints of microbial communities that play a large role in both carbon and nutrient cycling in lacustrine environments. Therefore, the forecasted warming could further increase the N 2 flux from sediments to the atmosphere, potentially impacting seagrass productivity and their capacity to mitigate climate change but also enhancing their potential N removal. Denitrification and anammox increased linearly with temperature, while N 2 fixation showed a maximum at intermediate temperatures. In vegetated sediments, anammox rates decreased with increasing organic matter (OM) content, while N 2 fixation increased with OM content. Despite the importance of this coastal lagoon in removing N from the system, N 2 fixation can contribute substantially to seagrass growth since N 2 fixation rates found here could contribute up to 36 % of plant N requirements. The annual mean N loss was higher (8 and 63-fold higher) than the N 2 fixed (annual mean = 5.9 ± 0.2 and 0.8 ± 0.3 mg N m −2 d −1) in the meadow and bare sediment, leading to a net flux of N 2 from sediments to the atmosphere. We detected high annual mean rates of denitrification (34.9 ± 10.3 and 31.6 ± 8.9 mg N m −2 d −1) and anammox (12.4 ± 3.4 and 19.8 ± 4.4 mg N m −2 d −1) in vegetated and bare sediments.
Here, we measured denitrification, anaerobic ammonium oxidation (anammox), and N 2 fixation in tropical seagrass (Enhalus acoroides) meadow and the adjacent bare sediment in a coastal lagoon in the central Red Sea. Therefore, the role of coastal marine systems dominated by seagrasses in the net N 2 flux remains unclear. However, atmospheric dinitrogen (N 2) fixation has been reported to support seagrass growth. Shallow sediments and seagrass meadows are hotspots for denitrification, favoring N loss. Nitrogen loads in coastal areas have increased dramatically with detrimental consequences for coastal ecosystems. O 2, H 2, H 2S, N 2O, pH, Redox, NO, Temp, STOX and EP are all in our portfolioĪbstract.
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