Demersal fishery Impacts on Sedimentary Organic Matter (DISOM): A global harmonized database of studies assessing the impacts of demersal fisheries on sediment biogeochemistry
Abstract. Marine sediments are one of the largest carbon reservoirs on the planet and play a key role in the global cycling of organic matter. Bottom fisheries constitute the most widespread anthropogenic physical disturbance to seabed habitats, and this has prompted NGOs and governments to act on regulating mobile bottom contacting fishing gear. However, the scientific evidence of the effects of bottom trawling on sediment biogeochemistry are highly diverse and present contrasting results. Here we present a global harmonized dataset of 71 independent studies that assess the effects of demersal fisheries on sedimentological (i.e. grain size, porosity) and biogeochemical (i.e. organic carbon, phytopigments, nutrient fluxes) properties: Demersal fishery Impacts on Sedimentary Organic Matter (DISOM) database (Paradis, 2023; https://doi.org/10.3929/ethz-b-000634336). We establish protocols to report metadata that will allow a better comparison of the results in order to improve our understanding of the effects of bottom trawling on the seafloor on a global scale. With this harmonized database, we aim to allow researchers to explore the effects of demersal fisheries in variable environmental settings to deconvolve the effects of this disturbance and provide efficient management strategies.
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