title: Remediation of a Eutrophic Bay in the Baltic Sea.
abstract: Eutrophication of coastal ecosystems is a global problem that often results in bottom water oxygen deficiency and in turn promotes sediment phosphorus (P) release (A). In order to increase sediment P retention, we injected dissolved aluminum into the anoxic sediment of a eutrophic semienclosed bay in the Baltic Sea, thereby inhibiting P recycling and further eutrophication (B). The P concentration in the bay remained at half, as did phytoplankton biomass (C), compared to pretreatment conditions and compared to the reference bay. Four years after treatment the water column transparency was increased, allowing submerged vegetation to penetrate deeper, and the habitat suitable for fish and benthic fauna had expanded (D). The lowered P concentration in the bay decreased the P export to the surrounding archipelago. This is the first full-scale marine remediation project using a geo-engineering method that demonstrates a quick recovery. For successful remediation in coastal areas, permanent binding of mobile P in anoxic sediments may be needed together with measures in the catchment area to obtain faster recovery of eutrophicated marine ecosystems.
authors.affiliation: BalticSea2020, Box 50005, SE-104 05 Stockholm, Sweden.
authors.forename: Emil
authors.identifier: 0000-0002-2566-8547
authors.initials: E
authors.lastname: Rydin
authors.affiliation: BalticSea2020, Box 50005, SE-104 05 Stockholm, Sweden.
authors.forename: Linda
authors.initials: L
authors.lastname: Kumblad
authors.affiliation: Stockholm University Baltic Sea Center, Stockholm University , SE-106 91 Stockholm, Sweden.
authors.forename: Fredrik
authors.initials: F
authors.lastname: Wulff
authors.affiliation: Department of Biology and Environmental Science, Linnaeus University , SE-391 82 Kalmar, Sweden.
authors.forename: Per
authors.initials: P
authors.lastname: Larsson
mesh_terms: D000818:Animals; D061006:Bays; D017753:Ecosystem; D005068:Eutrophication; D019015:Geologic Sediments; D010758:Phosphorus
chemical_list: D010758:Phosphorus