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Aquaculture Environment Interactions

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AEI 2:177-191 (2012)  -  DOI:

Effects of mussel farms on the benthic nitrogen cycle on the
Swedish west coast

Marita Sundstein Carlsson1,2,*, Pia Engström3, Odd Lindahl4, Lars Ljungqvist5, Jens Kjerulf Petersen6, Linda Svanberg7, Marianne Holmer2

1Department of Marine Ecology, National Environmental Research Institute, Aarhus University, 4000 Roskilde, Denmark
2Institute of Biology, University of Southern Denmark, 5230 Odense M, Denmark
3Civil and Environmental Engineering, Chalmers University of Technology, 412 96 Gothenburg, Sweden
4The Royal Swedish Academy of Sciences, 450 34 Fiskebäckskil, Sweden
5Sven Lovén Centre for Marine Sciences, and 7Department of Marine Ecology, University of Gothenburg, 450 34 Fiskebäckskil, Sweden
6Danish Shellfish Centre, 7900 Nykøbing M, Denmark

ABSTRACT: The biogeochemical impact of 3 long-line mussel farms (M1, M2 and M3) in Lysekil, Sweden, was investigated from before farm establishment until 1.5 yr after operation had begun. Sedimentation, benthic N flux, total oxygen uptake (TOU) and sulfate reduction rate (SRR) were all significantly increased below the mussel lines at all 3 farms. Effects of increased sedimentation rates were revealed by sediment profile imaging and were highest at Stn M2. These effects increased significantly with time of farm operation, indicating the accumulation of organic matter within sediments over time. Furthermore, more total particulate organic N deposited at farm stations was recycled into the water column compared to at reference stations (~45 versus ~13%), indicating an increased release of dissolved inorganic N from sediment below the mussel farms. At one station (M2) with the highest increase in sedimentation rate, denitrification seemed inhibited, while at another station (M3), with a less pronounced increase in sedimentation rate, denitrification was in fact stimulated, accounting for 13% of total sediment N removal. Calculations based on estimated values of N removal through mussel harvest and direct measurements of N input through changes in sedimentation, N regeneration from sediment to the water column through benthic fluxes and changes in denitrification showed, in all cases, a net removal of N from the system, as only 26 to 40% of the total amount of harvested N had been added to the sediments during the growth period.

KEY WORDS: Mussel farm · Benthic mineralization · Nitrogen · Denitrification

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Cite this article as: Carlsson MS, Engström P, Lindahl O, Ljungqvist L, Petersen JK, Svanberg L, Holmer M (2012) Effects of mussel farms on the benthic nitrogen cycle on the
Swedish west coast. Aquacult Environ Interact 2:177-191.

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