Spatial variability of prokaryotic and viral abundances in the Kermadec and Atacama Trench regions.

Autor: Schauberger C; Department of Biology, Nordcee and HADAL University of Southern Denmark Odense Denmark., Middelboe M; Department of Biology, Nordcee and HADAL University of Southern Denmark Odense Denmark.; Marine Biological Section, Department of Biology University of Copenhagen Helsingør Denmark., Larsen M; Department of Biology, Nordcee and HADAL University of Southern Denmark Odense Denmark., Peoples LM; Marine Biology Research Division, Scripps Institution of Oceanography University of California San Diego La Jolla California USA., Bartlett DH; Marine Biology Research Division, Scripps Institution of Oceanography University of California San Diego La Jolla California USA., Kirpekar F; Department of Biochemistry and Molecular Biology University of Southern Denmark Odense M Denmark., Rowden AA; National Institute of Water and Atmospheric Research Wellington New Zealand.; School of Biological Sciences, Victoria University of Wellington Wellington New Zealand., Wenzhöfer F; Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research Bremerhaven Germany.; Max Planck Institute for Marine Microbiology and Ecology Bremen Germany., Thamdrup B; Department of Biology, Nordcee and HADAL University of Southern Denmark Odense Denmark., Glud RN; Department of Biology, Nordcee and HADAL University of Southern Denmark Odense Denmark.; Department of Ocean and Environmental Sciences Tokyo University of Marine Science and Technology Tokyo Japan.; Danish Institute for Advanced Study - DIAS, University of Southern Denmark Odense Denmark.
Jazyk: angličtina
Zdroj: Limnology and oceanography [Limnol Oceanogr] 2021 Jun; Vol. 66 (6), pp. 2095-2109. Date of Electronic Publication: 2021 Feb 28.
DOI: 10.1002/lno.11711
Abstrakt: 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 increasing with depth, presumably reflecting the declining availability of organic material. Prokaryotic and viral abundances in sediments were lower at the adjacent abyssal sites than at the hadal sites and declined exponentially with sediment depth, closely tracking the attenuation of total organic carbon (TOC) content. In contrast, hadal sediment exhibited erratic depth profiles of prokaryotes and viruses with many subsurface peaks. The prokaryotic abundance correlated well to extensive fluctuations in TOC content at centimeter scale, which were likely caused by recurring mass wasting events. Yet while prokaryotic and viral abundances cross correlated well in the abyssal sediments, there was no clear correlation in the hadal sites. The results suggested that dynamic depositional conditions and higher substrate availability result in a high spatial heterogeneity in viral and prokaryotic abundances in hadal sediments in comparison to more stable abyssal settings. We argue that these conditions enhance the relatively importance of viruses for prokaryotic mortality and carbon recycling in hadal settings.
Competing Interests: None declared.
(© 2021 The Authors. Limnology and Oceanography published by Wiley Periodicals LLC on behalf of Association for the Sciences of Limnology and Oceanography.)
Databáze: MEDLINE
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