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Beach-cast as biofertiliser in the Baltic Sea region-potential limitations due to cadmium-content

Journal article
Authors D. Franzén
Eduardo Infantes
F. Gröndahl
Published in Ocean and Coastal Management
Volume 169
Pages 20-26
ISSN 0964-5691
Publication year 2019
Published at Department of marine sciences
Pages 20-26
Language en
Links dx.doi.org/10.1016/j.ocecoaman.2018...
Keywords Beach-cast management, Biofertiliser, Cadmium-levels, Macro algae, Marine bioresources, Seagrass, Species composition, Zostera marina, Algae, Cadmium, Chemical analysis, Environmental Protection Agency, Fertilizers, Sewage sludge, Cadmium levels, Seagrasses, Beaches, Ceramium, Polysiphonia, Rhodophyta
Subject categories Marine ecology

Abstract

Macroalgal mass blooms and accumulating beach-cast are increasing problems in many coastal areas. However, beach-cast is also a potentially valuable marine bioresource, e.g. as a biofertiliser in coastal agriculture. One limiting factor in use of beach-cast as a fertiliser is uncertainty regarding the cadmium (Cd) concentration depending on beach-cast composition and location. In this study, chemical analyses were performed on beach-cast from Burgsviken Bay off Gotland, in the Baltic Sea. The results revealed large variations in cadmium concentration depending on sampling location and beach-cast composition, with levels ranging between 0.13 and 2.2 mg Cd/kg dry matter (DM). Of 15 beach-cast samples analysed, one had a cadmium content above the Swedish statutory limit for sewage sludge biofertiliser (2 mg Cd/kg DM) and four had values above the limit suggested by the Swedish Environmental Protection Agency for 2030 (0.8 mg/kg DM). Species-specific analysis revealed that eelgrass (Zostera marina) contained significantly higher cadmium concentrations than filamentous red algae species (Ceramium and Polysiphonia spp.). Avoiding eelgrass-rich beach-cast by seasonal timing of harvesting and monitoring differences in cadmium concentrations between harvesting sites could thus facilitate use of beach-cast as biofertiliser. © 2018

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