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What a drag: quantifying the global impact of chronic bottom trawling on continental shelf sediment
In: Journal of Marine Systems. Elsevier: Tokyo; Oxford; New York; Amsterdam. ISSN 0924-7963; e-ISSN 1879-1573, meer
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| Trefwoorden |
Catching methods > Net fishing > Trawling > Bottom trawling
Marien/Kust |
| Auteurs | | Top |
- Oberle, F.K.J.
- Storlazzi, C.D.
- Hanebuth, T.J.J.
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| Abstract |
Continental shelves worldwide are subject to intense bottom trawling that causes sediment to be resuspended. The widely used traditional concepts of modern sedimentary transport systems on the shelf rely only on estimates for naturally driven sediment resuspension such as through storm waves, bottom currents, and gravitydriven flows but they overlook a critical anthropogenic factor. The strong influence of bottom trawling on a source-to-sink sediment budget is explored on the NWIberian shelf. Use of Automated Information Systemvessel tracking data provides for a high-resolution vessel track reconstruction and the accurate calculation of the spatial distribution of bottom trawling intensity and associated resuspended sediment load. The mean bottomtrawling-induced resuspended sediment mass for the NW Iberian shelf is 13.50 Mt yr−1, which leads to a sixfold increase in off-shelf sediment transport when compared to natural resuspension mechanisms. The sourceto-sink budget analysis provides evidence that bottom trawling causes a rapid erosion of the fine sediment on human time scales. Combining global soft sediment distribution data of the shelves with worldwide bottom trawling intensity estimates we show that the bottom trawling-induced resuspended sediment mass amounts to approximately the same mass of all sediment entering the shelves through rivers. Spatial delineations between natural and anthropogenic sediment resuspension areas are presented to aid inmarine management questions. |
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