01387nas a2200157   4500008004100000022001400041245006900055210006900124260001200193300001600205490000700221520088600228100002701114700002101141856006701162       2023                        eng d  a0024-359000aSediment oxygen consumption in Antarctic subglacial environments0 aSediment oxygen consumption in Antarctic subglacial environments  c07/2023  a1557 - 15660 v683 a<p>Oxygen consumption in aquatic sediments is an indicator of overall biological activity of the ecosystem. As such, rates of sedimentary oxygen utilization are well documented for much of the open oceans and freshwater lakes. However, there are few direct measurements of sedimentary oxygen consumption from Antarctic subglacial aquatic sediments. We report the first microsensor oxygen profiles and derived sedimentary oxygen consumption rates from beneath the Ross Ice Shelf and a subglacial lake beneath the West Antarctic Ice Sheet. Rates of oxygen consumption in these two environments are relatively low, but comparable to those reported from ice-free polar oceans and oligotrophic Arctic lakes. Our study demonstrates the presence of oxygen within Antarctic subglacial aquatic sediments and its importance for oxygen-consuming microorganisms living in these ecosystems.</p>1 aMichaud, Alexander, B.1 aPriscu, John, C.  uhttps://aslopubs.onlinelibrary.wiley.com/doi/10.1002/lno.12366