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From the Surface Ocean to the Seafloor: Linking Modern and Paleo-Genetics at the Sabrina Coast, East Antarctica (IN2017_V01)

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dc.contributor.authorArmbrecht, L.
dc.contributor.authorFocardi, A.
dc.contributor.authorLawler, K.A.
dc.contributor.authorO’Brien, P.
dc.contributor.authorLeventer, A.
dc.contributor.authorNoble, T.L.
dc.contributor.authorOpdyke, B.
dc.contributor.authorDuffy, M.
dc.contributor.authorEvangelinos, D.
dc.contributor.authorGeorge, S.C.
dc.contributor.authorLieser, J.
dc.contributor.authorLópez-Quirós, A.
dc.contributor.authorPost, A.
dc.contributor.authorOstrowski, M.
dc.contributor.authorPaulsen, I.
dc.contributor.authorArmand, L.
dc.date.issued2023
dc.description.abstractWith ongoing climate change, research into the biological changes occurring in particularly vulnerable ecosystems, such as Antarctica, is critical. The Totten Glacier region, Sabrina Coast, is currently experiencing some of the highest rates of thinning across all East Antarctica. An assessment of the microscopic organisms supporting the ecosystem of the marginal sea-ice zone over the continental rise is important, yet there is a lack of knowledge about the diversity and distribution of these organisms throughout the water column, and their occurrence and/or preservation in the underlying sediments. Here, we provide a taxonomic overview of the modern and ancient marine bacterial and eukaryotic communities of the Totten Glacier region, using a combination of 16S and 18S rRNA amplicon sequencing (modern DNA) and shotgun metagenomics (sedimentary ancient DNA, sedaDNA). Our data show considerable differences between eukaryote and bacterial signals in the water column versus the sediments. Proteobacteria and diatoms dominate the bacterial and eukaryote composition in the upper water column, while diatoms, dinoflagellates, and haptophytes notably decrease in relative abundance with increasing water depth. Little diatom sedaDNA is preserved in the sediments, which are instead dominated by Proteobacteria and Retaria. We compare the diatom microfossil and sedaDNA record and link the weak preservation of diatom sedaDNA to DNA degradation while sinking through the water column to the seafloor. This study provides the first assessment of DNA transfer from ocean waters to sediments and an overview of the microscopic communities occurring in the climatically important Totten Glacier region.
dc.description.statementofresponsibilityLinda Armbrecht, Amaranta Focardi, Kelly-Anne Lawler, Phil O, Brien, Amy Leventer, Taryn L. Noble, Bradley Opdyke, Meghan Duffy, Dimitris Evangelinos, Simon C. George, Jan Lieser, Adrián López-Quirós, Alix Post, Martin Ostrowski, Ian Paulsen, and Leanne Armand
dc.identifier.citationJournal of Geophysical Research: Biogeosciences, 2023; 128(4):e2022JG007252-1-e2022JG007252-20
dc.identifier.doi10.1029/2022JG007252
dc.identifier.issn2169-8953
dc.identifier.issn2169-8961
dc.identifier.orcidArmbrecht, L. [0000-0002-1213-1257]
dc.identifier.urihttps://hdl.handle.net/2440/141366
dc.language.isoen
dc.publisherAmerican Geophysical Union
dc.relation.granthttp://purl.org/au-research/grants/arc/DP170100557
dc.relation.granthttp://purl.org/au-research/grants/arc/DE210100929
dc.relation.granthttp://purl.org/au-research/grants/arc/FL140100021
dc.rights© 2023 The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
dc.source.urihttps://doi.org/10.1029/2022jg007252
dc.titleFrom the Surface Ocean to the Seafloor: Linking Modern and Paleo-Genetics at the Sabrina Coast, East Antarctica (IN2017_V01)
dc.typeJournal article
pubs.publication-statusPublished

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