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Marine litter is an ever-increasing problem that demands immediate reduction plans and mitigation actions that should act synergically to efficiently meet ambitious goals. Since the seafloor has been recognized as the major sink for marine debris, the study of litter accumulation dynamics represent a fundamental tool to evaluate possible removal actions. We analysed a 7 years (2013-2019) standardized data series collected along Sardinian fishing grounds through MEDiterranean International Trawl Survey, for which estimates of density and weight of seafloor macro-litter were calculated for over 707 hauls. Results show the absence of any temporal trend in seafloor macro-litter density and weight, but rather indicate a spatial and bathymetric segregation of different litter categories. Our data showed how different sources and physical features of macro-litter items (i.e., plastic and fishing gear, rubber, glass, metals, and cloth) led to spatially segregated accumulation hotspots. We also point out here how the identification of seafloor macro-litter hotspots using aggregated data that include plastic items could obscure the identification of other segregated but yet relevant hotspots of other macro-litter categories accumulated in the marine environment. These hotspots often occurred at shallower depths and closer to coastlines, thus representing potential spots where eventual future litter removal action could be prioritized.
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http://dx.doi.org/10.1016/j.envpol.2021.118338 | DOI Listing |
Environ Sci Pollut Res Int
June 2024
Department of Life and Environmental Sciences, University of Cagliari, Via Tommaso Fiorelli 1, 09126, Cagliari, Italy.
This study provides new insights onto spatial and temporal trends of seafloor macro-litter in the abyssal seafloor of Sardinian channel, in central western Mediterranean (Italy). Trawl surveys were conducted at depths between 884 and 1528 m, thus focusing on one of the least investigated marine environments. None of the considered sites was litter free, with plastics being numerically dominant (57% of items), followed by metal (11%) and glass (16%).
View Article and Find Full Text PDFMar Pollut Bull
March 2024
Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Sicily Marine Centre, Messina, Italy. Electronic address:
In recent years, a growing body of literature on seafloor macro-litter has been produced worldwide. However, the spatial coverage of these studies is still limited and highly unbalanced, resulting in considerable knowledge gaps in some regions. To address this lack of information in Oceania, we extracted data from the Citizen Science project Dive Against Debris® to characterize marine debris collected by volunteer scuba divers on the coastal seafloor.
View Article and Find Full Text PDFEnviron Pollut
February 2024
ConISMa, Piazzale Flaminio 9, 00196, Rome, Italy; Laboratory of Experimental Ecology and Aquaculture, Department of Biology - University of Rome Tor Vergata, via della Ricerca Scientifica snc, 00133, Rome, Italy.
The progressive increase of marine macro-litter on the bottom of the Mediterranean Sea is an urgent problem that needs accurate information and guidance to identify those areas most at risk of accumulation. In the absence of dedicated monitoring programs, an important source of opportunistic data is fishery-independent monitoring campaigns of demersal resources. These data have long been used but not yet extensively.
View Article and Find Full Text PDFMar Pollut Bull
March 2023
Israel Oceanographic & Limnological Research, National Institute of Oceanography, Haifa, Israel.
This study explores the first record of spatiotemporal distributions of macro and micro-litter on the seafloor in the Southeastern (SE) Levantine Basin (LB) during 2012-2021. Macro-litter was surveyed by bottom trawls in water depths of 20-1600 m and micro-litter by sediment box corer/grab at a depths range of 4-1950 m. Maximal macro-litter concentrations were recorded at the upper continental slope (200 m), averaging 4700 ± 3000 items/km.
View Article and Find Full Text PDFEnviron Pollut
January 2022
Dipartimento di Scienze della vita e dell'ambiente, Università degli Studi di Cagliari, Via Tommaso Fiorelli 1, 09126, Cagliari, Italy; ConISMa, Piazzale Flaminio 9, 00196, Rome, Italy.
Marine litter is an ever-increasing problem that demands immediate reduction plans and mitigation actions that should act synergically to efficiently meet ambitious goals. Since the seafloor has been recognized as the major sink for marine debris, the study of litter accumulation dynamics represent a fundamental tool to evaluate possible removal actions. We analysed a 7 years (2013-2019) standardized data series collected along Sardinian fishing grounds through MEDiterranean International Trawl Survey, for which estimates of density and weight of seafloor macro-litter were calculated for over 707 hauls.
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