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Nutrient dynamics in the western Canadian Arctic. I. New production in spring inferred from nutrient draw-down in the Cape Bathurst Polynya

2013; Inter-Research; Volume: 484; Linguagem: Inglês

10.3354/meps10275

1616-1599

KG Simpson, Jean‐Éric Tremblay, Neil M. Price,

Marine Biology and Ecology Research

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 484:33-45 (2013) - DOI: https://doi.org/10.3354/meps10275 Nutrient dynamics in the western Canadian Arctic. I. New production in spring inferred from nutrient draw-down in the Cape Bathurst Polynya Kyle G. Simpson1,2,*, Jean-Éric Tremblay1,3, Neil M. Price1 1Department of Biology, 1205 Ave. Dr. Penfield, McGill University, Montréal, Québec H3A 1B1, Canada 2Present address: Institute of Ocean Sciences, Fisheries & Oceans Canada, PO Box 6000, 9860 West Saanich Road, Sidney, British Columbia V8L 4B2, Canada 3Present address: Département de Biologie, Université Laval, Québec, Québec G1K 7P4, Canada *Email: kyle.simpson@dfo-mpo.gc.ca ABSTRACT: Ice-retreat from the Cape Bathurst Polynya occurred in late May and early June 2004, and was quickly followed by a decrease in dissolved nutrient concentration at the sea surface. Concentration plots of NO3- versus PO43-, and Si(OH)4 versus NO3- showed the ratios of nutrient uptake in the surface layer were in proportions expected for diatom growth (N:P 13.1:1; Si:N 1.8:1) and that water-column NO3- was depleted before PO43- and Si(OH)4. The temporal changes in integrated nitrate, phosphate and silicate concentrations were well described by logistic models that showed maximum consumption rates of 11.8, 0.82, and 17.8 mmol m-2 d-1, respectively, and a total seasonal draw-down of 210 ± 19 mmol NO3- m-2. If we include estimates of NO3- supply by advection, nitrification and freshwater dilution, then the amount of NO3- consumed could be 25-33% higher. Uptake of NO3- above the 1% isolume was balanced by an equivalent (94%) increase in particulate N over a 15 d period beginning at ice break-up. Thus, the amount of particulate spring new production associated with NO3- disappearance was estimated to be 16.1 ± 1.5 g C m-2. KEY WORDS: Phytoplankton production · Nutrient consumption · New production · Polynya · Nitrate · Phosphate · Silicate · Amundsen Gulf · Arctic Ocean Full text in pdf format PreviousNextCite this article as: Simpson KG, Tremblay JÉ, Price NM (2013) Nutrient dynamics in the western Canadian Arctic. I. New production in spring inferred from nutrient draw-down in the Cape Bathurst Polynya. Mar Ecol Prog Ser 484:33-45. https://doi.org/10.3354/meps10275 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 484. Online publication date: June 12, 2013 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2013 Inter-Research.