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- W2808819983 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 600:21-39 (2018) - DOI: https://doi.org/10.3354/meps12663 Short-term processing of ice algal- and phytoplankton-derived carbon by Arctic benthic communities revealed through isotope labelling experiments Anni Mäkelä1,*, Ursula Witte1, Philippe Archambault2 1School of Biological Sciences, University of Aberdeen, Aberdeen AB24 3UU, UK 2Département de biologie, Québec Océan, Université Laval, Québec, QC G1V 0A6, Canada *Corresponding author: anni.makela10@gmail.com ABSTRACT: Benthic ecosystems play a significant role in the carbon (C) cycle through remineralization of organic matter reaching the seafloor. Ice algae and phytoplankton are major C sources for Arctic benthic consumers, but climate change-mediated loss of summer sea ice is predicted to change Arctic marine primary production by increasing phytoplankton and reducing ice algal contributions. To investigate the impact of changing algal C sources on benthic C processing, 2 isotope tracing experiments on 13C-labelled ice algae and phytoplankton were conducted in the North Water Polynya (NOW; 709 m depth) and Lancaster Sound (LS; 794 m) in the Canadian Arctic, during which the fate of ice algal (CIA) and phytoplankton (CPP) C added to sediment cores was traced over 4 d. No difference in sediment community oxygen consumption (SCOC, indicative of total C turnover) between the background measurements and ice algal or phytoplankton cores was found at either site. Most of the processed algal C was respired, with significantly more CPP than CIA being released as dissolved inorganic C at both sites. Macroinfaunal uptake of algal C was minor, but bacterial assimilation accounted for 33-44% of total algal C processing, with no differences in bacterial uptake of CPP and CIA found at either site. Overall, the total processing (i.e. assimilation and respiration) of CPP was 33 and 37% higher than processing of CIA in NOW and in LS, respectively, suggesting that the future changes in quality of organic matter sinking to the seafloor could impact the C residence time at the seafloor. KEY WORDS: Arctic · Carbon cycling · Sediment · Respiration · 13C · Bacteria · Benthic-pelagic coupling · Sea ice cover Full text in pdf format PreviousNextCite this article as: Mäkelä A, Witte U, Archambault P (2018) Short-term processing of ice algal- and phytoplankton-derived carbon by Arctic benthic communities revealed through isotope labelling experiments. Mar Ecol Prog Ser 600:21-39. https://doi.org/10.3354/meps12663 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 600. Online publication date: July 30, 2018 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2018 Inter-Research." @default.
- W2808819983 created "2018-06-29" @default.
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- W2808819983 date "2018-07-30" @default.
- W2808819983 modified "2023-10-14" @default.
- W2808819983 title "Short-term processing of ice algal- and phytoplankton-derived carbon by Arctic benthic communities revealed through isotope labelling experiments" @default.
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