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Nutrient fluxes from reduced Baltic Sea sediment: effects of oxygenation and macrobenthos
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
Number of Authors: 3
2016 (English)In: Marine Ecology Progress Series, ISSN 0171-8630, E-ISSN 1616-1599, Vol. 544, 77-92 p.Article in journal (Refereed) Published
Abstract [en]

Effects of bottom water oxygenation and macrofaunal colonisation on benthic fluxes of nitrogen (N), phosphorus (P) and silicon (Si) from long-term anoxic Baltic Sea bottom sediment were investigated. Sediment boxcosms from an anoxic site at 150 m depth in the open Baltic proper were incubated in the laboratory to follow the development of benthic nutrient fluxes during 74 d exposure to flow-through of oxygen-rich water. In contrast to traditional end-point experimental designs, our repeated measurement approach allowed for separation of transient and long-term effects of oxygenation and bioturbation on benthic nutrient recycling. The composition, but not the rate, of the benthic total dissolved N efflux changed by oxygenation from being dominated by NH4 in situ to being mostly composed of NO2 + NO3 and dissolved organic N (DON) under oxic conditions. Oxygenation in the boxcosms decreased the benthic efflux of dissolved silicate (DSi) and essentially shut off the in situ flux of dissolved inorganic phosphorus (DIP). After 20 d of oxygenation, 2 bottom macrofauna taxa, the polychaete Marenzelleria spp. and the amphipod Monoporiea affinis, were introduced to a subset of the boxcosms. Bioturbation by either taxa increased the efflux of dissolved inorganic N (DIN), DON and DSi to the overlying water. The P-rich benthic flux under in situ anoxic conditions roughly approached Redfield N: P stoichiometry after oxygenation in the sediment boxcosms. Upon addition of macrofauna, bioturbation gene rated even higher N:P flux ratios.

Place, publisher, year, edition, pages
2016. Vol. 544, 77-92 p.
Keyword [en]
Bioturbation, Oxygenation, Benthic nutrient fluxes, Baltic Sea, Bottom sediment
National Category
Biological Sciences Earth and Related Environmental Sciences
URN: urn:nbn:se:su:diva-128546DOI: 10.3354/meps11592ISI: 000371142500006OAI: diva2:939913
Available from: 2016-06-20 Created: 2016-03-30 Last updated: 2016-06-20Bibliographically approved

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Blomqvist, Sven
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