Effects of mussel farms on the benthic nitrogen cycle on the Swedish west coast
Författare och institution:
M. S. Carlsson (-); Pia Engström (Institutionen för kemi- och bioteknik, Chalmers); Odd Lindahl (-); Lars Ljungqvist (Institutionen för biologi och miljövetenskap); J. K. Petersen (-); Linda Svanberg (Institutionen för biologi och miljövetenskap); M. Holmer (-)
Publicerad i:
Aquaculture Environment Interactions, 2 ( 2 ) s. 177-191
ISSN:
1869-215X
Publikationstyp:
Artikel, refereegranskad vetenskaplig
Publiceringsår:
2012
Språk:
engelska
Fulltextlänk:
Sammanfattning (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 (similar to 45 versus similar to 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.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
NATURVETENSKAP ->
Biologiska vetenskaper ->
Ekologi
Biologiska vetenskaper ->
Ekologi
Nyckelord:
Mussel farm, Benthic mineralization, Nitrogen, Denitrification, marine-sediments, nitrate reduction, shellfish aquaculture, organic, enrichment, nutrient fluxes, new-zealand, denitrification, ammonium, impacts, oxygen
Postens nummer:
156974
Posten skapad:
2012-04-23 12:20
Posten ändrad:
2012-04-24 09:14