Plankton community and bacterial metabolism in Arctic sea ice leads during summer 2010

E. E. García-Martín, P. Serret, R. J. G. Leakey

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Microbial plankton metabolism was examined during summer 2010 in sea ice-influenced waters of the Fram Strait, eastern Arctic Ocean. Rates of gross primary production and community respiration were tightly coupled over a wide range of values (33±3–143±6 and 20±3–126±6 mmol O2 m−2 −1, respectively) leading to a prevalence of positive net community production. The high variability in community respiration, similar to that of gross primary production, suggests that heterotrophic metabolism may exhibit a significant response to environmental change. Bacterial respiration was assessed at similar time scales to bacterial production measurements, by determining the in vivo INT reduction capacity without pre-filtering the community. Bacteria seem to play a major role in total community respiration, contributing between 5% and 61% of total community respiration, indicating that a high fraction of the organic carbon in Arctic planktonic food webs could flow through these microbes.
Original languageEnglish
Pages (from-to)152-161
Number of pages10
JournalDeep Sea Research Part I: Oceanographic Research Papers
Publication statusPublished - 1 Oct 2014

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