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Organic matter from Artic sea ice loss alters bacterial community structure and function

Underwood, Graham and Michel, Christine and Meisterhans, Guillame and Niemi, Andrea and Belzile, Claude and Witt, Matthias and Dumbrell, Alex J and Koch, Boris P (2019) 'Organic matter from Artic sea ice loss alters bacterial community structure and function.' Nature Climate Change, 9. 170 - 176. ISSN 1758-678X

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Abstract

Continuing losses of multi-year sea ice (MYI) across the Arctic are resulting in first-year ice (FYI) dominating the Arctic ice pack. Melting FYI provides a strong seasonal pulse of dissolved organic matter (DOM) into surface waters; however, the biological impact of this DOM input is unknown. Here we show that DOM additions cause significant and contrasting changes in under-ice bacterioplankton abundance, production and species composition. Utilization of DOM was influenced by molecular size, with 10-100 kDa and >100 kDa DOM fractions promoting rapid growth of particular taxa, while uptake of sulfur and nitrogen-rich low molecular weight organic compounds shifted bacterial community composition. These results demonstrate the ecological impacts of DOM released from melting FYI, with wideranging consequences for the cycling of organic matter across regions of the Arctic Ocean transitioning from multi-year to seasonal sea ice as the climate continues to warm.

Item Type: Article
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
G Geography. Anthropology. Recreation > GE Environmental Sciences
Divisions: Faculty of Science and Health > Life Sciences, School of
Depositing User: Elements
Date Deposited: 22 Jan 2019 19:04
Last Modified: 29 Aug 2019 21:15
URI: http://repository.essex.ac.uk/id/eprint/23635

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