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Microplastic accumulation in a Zostera marina L. bed at Deerness Sound, Orkney, Scotland
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Researchers conducted the first known study of microplastic contamination within a seagrass bed, examining a Zostera marina meadow in Orkney, Scotland. Microplastics were found in 94% of sediment, seagrass blade, water, and biota samples, with fibers making up more than half of all particles detected. The study confirmed that seagrass beds accumulate microplastics and that particles adhere directly to seagrass blades.
Seagrasses have global distribution and are highly productive and economically valuable habitats. They are sensitive and vulnerable to a range of human-induced pressures, including ongoing exposure to marine litter, such as microplastic particles (<5 mm). In this study, a Zostera marina bed in Deerness Sound, Orkney was selected to determine whether microplastics accumulate in seagrass beds and adhere to seagrass blades. Sediment, seagrass blade, biota and seawater samples were collected. 280 microplastic particles (0.04 to 3.95 mm (mean = 0.95 mm ± 0.05 SE)) were observed in 94% of samples collected (n = 111). These were visually categorised into type (fibre, flake, fragment) and colour, and 50 were successfully identified as plastic using ATR-FTIR. Fibres contributed >50% of the total microplastics observed across all samples. This is the first known study on Z. marina to describe microplastic loading within a seagrass bed and to identify microplastic adherence to seagrass blades.
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Researchers surveyed microplastic contamination in eelgrass meadows across coastal Massachusetts, finding microplastics present at all sites regardless of proximity to human development. The study suggests that microplastic accumulation patterns in seagrass ecosystems are related to epiphytic cover on leaves, plant morphology, and sediment bulk density, providing the first baseline concentrations for the temperate western North Atlantic.
Microplastics in the mix: types and retention of microplastics within a mixed species seagrass meadow in the Tamar Estuary
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Researchers examined microplastic types and retention patterns within a mixed-species seagrass meadow composed of Nanozostera noltei and Zostera marina in the Tamar Estuary, Plymouth Sound, UK, assessing how seagrass shoot density influences microplastic trapping. The study provides evidence that seagrass beds act as significant microplastic sinks in coastal estuarine systems.
Microplastic accumulation and impacts on eelgrass (Zostera marina L.) ecosystems throughout coastal Massachusetts, USA
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This study examined microplastic accumulation patterns and potential ecological impacts on eelgrass (Zostera marina) ecosystems along the coast of Massachusetts. The research investigated both the distribution of microplastics within seagrass meadows and how plastic contamination may affect the health of these important coastal habitats.
Trapping of microplastics and other anthropogenic particles in seagrass beds: Ubiquity across a vertical and horizontal sampling gradient
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Researchers examined how seagrass beds trap microplastics and other anthropogenic particles by sampling along a vegetation cover gradient from dense beds to less vegetated patches. The study found that seagrass vegetation enhances the accumulation of plastic debris in both sediment and among plant structures. Evidence indicates that seagrass ecosystems act as significant sinks for microplastic pollution, with implications for the organisms that depend on these habitats.
Early evidence of microplastics on seagrass and macroalgae
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Researchers quantified microplastic densities on the surfaces of three marine macrophyte species (two macroalgae and one seagrass) collected in situ, finding measurable contamination on all species. The results suggest that macrophytes may serve as an important but underappreciated pathway for microplastics to enter marine food webs.
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