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dc.contributor.authorVick-Majors, Trista J.
dc.contributor.authorAchberger, Amanda M.
dc.contributor.authorSantibanez, Pamela A.
dc.contributor.authorDore, John E.
dc.contributor.authorHodson, Timothy
dc.contributor.authorMichaud, Alexander B.
dc.contributor.authorChristner, Brent C.
dc.contributor.authorMikucki, Jill A.
dc.contributor.authorSkidmore, Mark L.
dc.contributor.authorPowell, Ross
dc.contributor.authorAdkins, W. Peyton
dc.contributor.authorBarbante, Carlo
dc.contributor.authorMitchell, Andrew C.
dc.contributor.authorScherer, Reed
dc.contributor.authorPriscu, John C.
dc.date.accessioned2016-08-18T17:25:21Z
dc.date.available2016-08-18T17:25:21Z
dc.date.issued2016-03
dc.identifier.citationVick-Majors, Trista J., Amanda Achberger, Pamela Santibanez, John E. Dore, Timothy Hodson, Alexander B. Michaud, Brent C. Christner, Jill Mikucki, Mark L. Skidmore, Ross Powell, W. Peyton Adkins, Carlo Barbante, Andrew Mitchell, Reed Scherer, and John C. Priscu. "Biogeochemistry and microbial diversity in the marine cavity beneath the McMurdo Ice Shelf, Antarctica." Limnology and Oceanography 61, no. 2 (March 2016): 572-586. DOI: 10.1002/lno.10234 .en_US
dc.identifier.issn1939-5590
dc.identifier.urihttps://scholarworks.montana.edu/xmlui/handle/1/9991
dc.description.abstractIce shelves surround ∼ 75% of Antarctica's coastline and are highly sensitive to climate change; several have recently collapsed and others are predicted to in the near future. Marine waters beneath ice shelves harbor active ecosystems, while adjacent seas can be important areas of bottom water formation. Despite their oceanographic significance, logistical constraints have resulted in few opportunities to directly sample sub-ice shelf cavities. Here, we present the first data on microbial diversity and biogeochemistry beneath the McMurdo Ice Shelf (MIS) near Ross Island, Antarctica. Physicochemical profiles obtained via a 56 m deep borehole through the MIS revealed three vertically layered water masses (Antarctic Surface Water [AASW], Ice Shelf Water [ISW], and modified High Salinity Shelf Water [mHSSW]). Metabolically active, moderately diverse (Shannon diversity from 2.06 to 5.74) microbial communities were detected in the AASW and mHSSW. Heterotrophic bacterial production and dissolved organic matter concentrations were higher (12–37% and 24%, respectively) in mHSSW relative to AASW. Chemoautotrophic production was 5.3 nmol C L−1 d−1 and 6.0 nmol C L−1 d−1 in the AASW and mHSSW, respectively. Phytoplankton cells were more abundant and larger in the mHSSW sample relative to the AASW, which indicates sinking of phytoplankton produced in surface waters and, together with southerly flowing currents (0.09–0.16 m s−1), horizontal advection of phytoplankton from McMurdo Sound. Advected phytoplankton carbon together with in situ chemoautotrophic production provide important sources of organic matter and other reduced compounds to support ecosystem processes in the dark waters in the ice shelf cavity.en_US
dc.description.sponsorshipWhillans Ice Stream Subglacial Access Research Drilling (WISSARD) project was funded by National Science Foundation grants (0838933, 0838896, 0838941, 0839142, 0839059, 0838885, 0838855, 0838763, 0839107, 0838947, 0838854, 0838764 and 1142123) from the Office of Polar Programs. Partial support was also provided by funds from NSF award 1023233 (B.C.C.); NSF award 1115245 (J.C.P.), the American Association of University Women Dissertation Fellowship (T.J.V.), the NSF’s Graduate Research Fellowship Program (1247192; A.M.A.); Chilean Fulbright-CONICYT Scholarship (P.S); the Italian National Antarctic Program (C.B.); fellowships from the NSF’s IGERT Program (0654336); Montana Space Grant Consortium (A.B.M.)en_US
dc.titleBiogeochemistry and microbial diversity in the marine cavity beneath the McMurdo Ice Shelf, Antarcticaen_US
dc.typeArticleen_US
mus.citation.extentfirstpage572en_US
mus.citation.extentlastpage586en_US
mus.citation.issue2en_US
mus.citation.journaltitleLimnology and Oceanographyen_US
mus.citation.volume61en_US
mus.identifier.categoryLife Sciences & Earth Sciencesen_US
mus.identifier.doi10.1002/lno.10234en_US
mus.relation.collegeCollege of Agricultureen_US
mus.relation.departmentLand Resources & Environmental Sciences.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.data.thumbpage3en_US


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