2021
DOI: 10.1002/lno.11711
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Spatial variability of prokaryotic and viral abundances in the Kermadec and Atacama Trench regions

Abstract: Hadal trenches represent the deepest part of the ocean and are dynamic depocenters with intensified prokaryotic activity. Here, we explored the distribution and drivers of prokaryotic and viral abundance from the ocean surface and 40 cm into sediments in two hadal trench regions with contrasting surface productivity. In the water column, prokaryotic and viral abundance decreased with water depth before reaching a rather stable level at~4000 m depth at both trench systems, while virus to prokaryote ratios were … Show more

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Cited by 22 publications
(30 citation statements)
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References 61 publications
(124 reference statements)
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“…The relative abundance peaked at 1.7 to 4.9% of all reads in the nitrogenous zone in the Atacama Trench and 0.2 to 0.4% in the Kermadec Trench. Since total cell counts in the two trenches were similar (20), this is consistent with the relative difference in qPCRbased counts, though lower depth resolution of the profiles in the Kermadec Trench might have smeared peak values (5-or 15-cm sections versus 1-cm sections in Atacama at the depths of interest).…”
Section: Resultssupporting
confidence: 70%
See 1 more Smart Citation
“…The relative abundance peaked at 1.7 to 4.9% of all reads in the nitrogenous zone in the Atacama Trench and 0.2 to 0.4% in the Kermadec Trench. Since total cell counts in the two trenches were similar (20), this is consistent with the relative difference in qPCRbased counts, though lower depth resolution of the profiles in the Kermadec Trench might have smeared peak values (5-or 15-cm sections versus 1-cm sections in Atacama at the depths of interest).…”
Section: Resultssupporting
confidence: 70%
“…Thus, the hadal sediments studied here were characterized by broad nitrogenous zones with nitrate and nitrite in the micromolar range and low ammonium concentrations and essentially free of reduced iron (SI Appendix, Fig. S3) and of bioturbation, as indicated by visual layering (20). These redox conditions are similar to those found in the anoxic core of OMZs (34), while previous studies of benthic anammox bacteria have mainly focused on coastal and continental shelf sites (e.g., ref.…”
Section: Resultssupporting
confidence: 52%
“…The findings here, combined with results from complementary studies in the Atacama Trench, suggest a close link between surface productivity and hadal ecosystem processes. Despite the lack of respiratory data from other trenches to compare with, there have been found higher prokaryotic abundances in the hadopelagic zone of the Atacama Trench than in hadal realms underlying less productive water columns (Schauberger et al 2021 ). Given that prokaryotes are an important component of the plankton < 100 μ m, and that these were responsible for most of the respiratory carbon demands measured here (Fig.…”
Section: Discussionmentioning
confidence: 99%
“…Among bacteria, those membranes reported to contain PC belong to the alpha and gamma subgroups of the Proteobacteria . Given that these bacterial groups are abundant in trench samples from Puerto Rico (Eloe et al, 2011), the Mariana Trench (Nunoura et al, 2015), and recently in the Atacama Trench (Schauberger et al, 2021), it is possible that PCs present in high abundance in the Atacama Trench are consistent with high abundance of Proteobacteria in these regions. Given their general known association and abundance in Atacama Trench sediments (Fig.…”
Section: Pc (Phosphatidylcholine)mentioning
confidence: 96%
“…Recent metagenomic data have revealed the presence of abundant heterotrophic microorganisms in sediments of the Challenger Deep (Nunoura et al, 2018), which are likely fueled by the endogenous recycling of available OM (Nunoura et al, 2015;Tarn et al, 2016). Furthermore, the abundance of prokaryotes in hadal depths can be influenced by dynamic depositional conditions (Schauberger et al, 2021), which in turn may be influenced by the intensity of propagating internal tides (Turnewitsch et al, 2014). All these factors likely alter the deposition, distribution, and composition of OM present in trench sediments.…”
Section: Introductionmentioning
confidence: 99%