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

• Published in: Journal of Geophysical Research: Biogeosciences
• Main Authors: Armbrecht, Linda, López Quirós, Adrián
• Format: Article in Journal/Newspaper
• Language: English
• Published: American Geophysical Union 2023
• Subjects: Antarctic; East Antarctica; Totten Glacier; Sabrina Coast; Antarc*; Antarctica; Sea ice
• Online Access: https://hdl.handle.net/10481/82073; https://doi.org/10.1029/2022JG007252

This project was supported through funding from the Australian Government’s Australian Antarctic Science Grant Programs (AAS 4333 and AAS 4419) and the Australian Research Council’s Discovery Projects funding scheme (DP170100557). We thank the team at the Australian Centre for Ancient DNA (ACAD), The Univer- sity of Adelaide, especially Corinne Preuss and Steve Johnson for their techni- cal help during the sedaDNA laboratory work. LA was funded by an Australian Research Council Discovery Early Career Researcher Award (ARC DECRA DE210100929). The modern molecular data analysis was supported by an ARC Grant awarded to IP (FL140100021). KAL is supported by an Australian Research Training Program (RTP) scholarship. We acknowledge the use of imagery from the NASA Worldview application (https://worldview.earthdata. nasa.gov), part of the NASA Earth Observing System Data and Information System (EOSDIS). Open access publish- ing facilitated by University of Tasmania, as part of the Wiley - University of Tasmania agreement via the Council of Australian University Librarians. With 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 ...