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@article{Dithugoe:2023:10.1128/msphere.00420-22,
author = {Dithugoe, CDD and Bezuidt, OKI and Cavan, ELL and Froneman, WPP and Thomalla, SJJ and Makhalanyane, TPP},
doi = {10.1128/msphere.00420-22},
journal = {mSphere},
title = {Bacteria and archaea regulate particulate organic matter export in suspended and sinking marine particle fractions},
url = {http://dx.doi.org/10.1128/msphere.00420-22},
volume = {8},
year = {2023}
}
TY - JOUR
AB - The biological carbon pump (BCP) in the Southern Ocean is driven by phytoplankton productivity and is a significant organic matter sink. However, the role of particle-attached (PA) and free-living (FL) prokaryotes (bacteria and archaea) and their diversity in influencing the efficiency of the BCP is still unclear. To investigate this, we analyzed the metagenomes linked to suspended and sinking marine particles from the Sub-Antarctic Southern Ocean Time Series (SOTS) by deploying a Marine Snow Catcher (MSC), obtaining suspended and sinking particulate material, determining organic carbon and nitrogen flux, and constructing metagenome-assembled genomes (MAGs). The suspended and sinking particle-pools were dominated by bacteria with the potential to degrade organic carbon. Bacterial communities associated with the sinking fraction had more genes related to the degradation of complex organic carbon than those in the suspended fraction. Archaea had the potential to drive nitrogen metabolism via nitrite and ammonia oxidation, altering organic nitrogen concentration. The data revealed several pathways for chemoautotrophy and the secretion of recalcitrant dissolved organic carbon (RDOC) from CO2, with bacteria and archaea potentially sequestering particulate organic matter (POM) via the production of RDOC. These findings provide insights into the diversity and function of prokaryotes in suspended and sinking particles and their role in organic carbon/nitrogen export in the Southern Ocean.IMPORTANCE The biological carbon pump is crucial for the export of particulate organic matter in the ocean. Recent studies on marine microbes have shown the profound influence of bacteria and archaea as regulators of particulate organic matter export. Yet, despite the importance of the Southern Ocean as a carbon sink, we lack comparable insights regarding microbial contributions. This study provides the first insights regarding prokaryotic contributions to particulate organic matter export
AU - Dithugoe,CDD
AU - Bezuidt,OKI
AU - Cavan,ELL
AU - Froneman,WPP
AU - Thomalla,SJJ
AU - Makhalanyane,TPP
DO - 10.1128/msphere.00420-22
PY - 2023///
SN - 2379-5042
TI - Bacteria and archaea regulate particulate organic matter export in suspended and sinking marine particle fractions
T2 - mSphere
UR - http://dx.doi.org/10.1128/msphere.00420-22
UR - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000974617200001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=a2bf6146997ec60c407a63945d4e92bb
UR - https://journals.asm.org/doi/10.1128/msphere.00420-22
UR - http://hdl.handle.net/10044/1/115036
VL - 8
ER -