期刊
MARINE ENVIRONMENTAL RESEARCH
卷 169, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marenvres.2021.105384
关键词
Baltic sea; Benthos; Environmental impact; Disturbance; macrofauna; Nutrient fluxes; Organic and dissolved inorganic carbon; Chlorophyll; water content
资金
- Swedish Research Council Formas [2017-00866]
- Formas [2017-00866] Funding Source: Formas
- Forte [2017-00866] Funding Source: Forte
Experimental benthic dredging in the Baltic Proper mimicked the impact of trawling on benthic biogeochemical processes, causing immediate effects on benthic fluxes and sediment properties. The removal of macrofauna by the dredge highlighted the potential loss of valuable functions associated with them in the studied area.
Experimental benthic dredging was conducted in an unfished, muddy area in the Baltic Proper to mimic the impact of trawling by removing surface sediment, with a focus on benthic biogeochemical processes. Sediment cores were taken on the track and compared to undisturbed controls. Benthic fluxes were immediately affected and an upward shift in pore water DIC profiles was detected. The time needed for the sediment to readjust to a new biogeochemical state seemed to be nutrient-specific. Sediment properties (profiles of chlorophyll, organic carbon and water content) were found to change significantly. Macrofauna was removed completely by the dredge pointing out the potential loss of highly valuable functions that are associated with them. In the Baltic Sea, in areas which were previously the most heavily fished, the frequency of trawling may have left little time for readjustment and potentially kept the seabed in a permanent state of transient biogeochemical cycling.
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