Effects of bottom trawling and hypoxia on benthic invertebrate communities
van Denderen, P.D.; Törnroos, A.; Sciberras, M.; Hinz, H.; Friedland, R.; Lasota, R.; Mangano, M.C.; Robertson, C.; Valanko, S.; Hiddink, J.G. (2022). Effects of bottom trawling and hypoxia on benthic invertebrate communities. Mar. Ecol. Prog. Ser. 694: 13-27. https://dx.doi.org/10.3354/meps14094 In: Marine Ecology Progress Series. Inter-Research: Oldendorf/Luhe. ISSN 0171-8630; e-ISSN 1616-1599, more |  |
| Keyword | | | Author keywords | Bottom-trawling · Hypoxia · Baltic Sea · Macrofauna · Body size · Longevity · Vertical position · Sediment |
| Authors | | Top | Dataset | - van Denderen, P.D.
- Törnroos, A.
- Sciberras, M.
- Hinz, H., more
| - Friedland, R.
- Lasota, R., more
- Mangano, M.C.
| - Robertson, C.
- Valanko, S.
- Hiddink, J.G., more
|
| Abstract | Marine benthic habitats in continental shelf regions are increasingly impacted by hypoxia caused by the combination of eutrophication and climate warming. Many regions that have the potential for hypoxic conditions are being fished by mobile bottom-contacting fishing gears. The combined effects of trawling and hypoxia may be synergistic and disproportionally impact benthic fauna, or they may act antagonistically, leading to smaller trawl impacts in hypoxic areas. Yet, few studies have quantified how bottom trawling and hypoxia interact to affect benthic communities. Here we examine these combined effects on benthic community biomass and abundance, the number of large organisms, the longevity distribution of the community and the vertical position of fauna in the sediment in the southern Baltic Sea. We find large declines in benthic biomass and abundance that co-occur with declines in near-bed oxygen concentrations from 5.8 to 0.8 ml O2 l-1. Conversely, no relationships and weak positive relationships are found between bottom trawl disturbance and benthic community biomass and abundance. No interacting effects between hypoxia and trawling are detected. Our findings therefore highlight a low likelihood of synergistic impacts of bottom trawling and hypoxia on the benthic communities studied. These results suggest that management may prioritize benthic protection from fishing in regions that are not in a state of oxygen stress. |
| Dataset | - van Denderen, P.D.; Törnroos, A.; Sciberras, S.; Hinz, H.; Lasota, R.; Mangano, M.C.; Valanko, S.; Hiddink, J.G.; Technical University of Denmark: Denmark; Abo Akademi University: Finland; Heriot-Watt University: Scotland; Universitat de les Illes Balears: Spain; University of Gdansk: Poland; Stazione Zoologica 'Anton Dohrn' of Naples: Italy; International Council for the Exploration of the Sea: Denmark; Bangor University: UK; (2022): EnBioSeaCo: Benthic invertebrate sampling over gradients of commercial trawling intensity and oxygen depletion in the Southern Baltic Sea. Marine Data Archive., more
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