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The role of seagrass meadows in the accumulation of microplastics: Insights from a South African estuary
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Researchers investigated whether seagrass meadows accumulate microplastics in a South African estuary, finding no significant difference in microplastic abundance between seagrass sediments and adjacent bare sediments at the small spatial scale studied.
Microplastics are widespread in marine ecosystems, where they threaten biota and human wellbeing. Seagrasses may act as natural filters of microplastics due to their particle trapping abilities, yet little is known about the extent of microplastics in the sediment of seagrass beds. The aim of this study was to compare microplastic accumulation in the sediments of Zostera capensis meadows with adjacent bare sediments at a small spatial scale (~5 km) in the Knysna estuary in South Africa. No significant difference in total microplastic counts were found between seagrass and unvegetated sediments. However, fibre microplastic counts differed significantly between the two locations at which samples were collected. This may be due to pollution levels and proximity to larger human population densities. Importantly, our study reveals variability in microplastic abundance and type even at small spatial scales, an important consideration for the design of future studies aiming to monitor for microplastics.
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The interaction between seagrass meadow density and microplastic retention in four cool-temperate estuaries
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Researchers examined whether seagrass meadows trap microplastics in their sediments across four South African estuaries. They found that in three of the four estuaries, dense seagrass beds contained more microplastics than bare sediment, with fibers and fragments being the most common types caught. The study confirms that seagrasses can act as natural filters for microplastic pollution, though the potential effects of trapped plastics on seagrass health remain unknown.
Canopy Accumulation: Are Seagrass Meadows a Sink of Microplastics?
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This meta-analysis investigates whether seagrass meadows accumulate more microplastics than surrounding bare sediments. The findings show that while microplastics are nearly everywhere in coastal sediments, seagrass beds do not concentrate them at higher levels than other areas. However, the widespread contamination is still concerning because many fish species depend on seagrass habitats, creating a pathway for plastics to enter the food chain.
Seagrass beds acting as a trap of microplastics - Emerging hotspot in the coastal region?
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Seagrass beds in coastal waters were found to trap and accumulate microplastics at higher concentrations than surrounding unvegetated sediments, acting as effective sinks for plastic particles due to their dense canopy structure. This positions seagrass meadows as emerging hotspots of microplastic contamination in coastal ecosystems.
A critical synthesis of seagrass meadows as microplastic sinks: Current trends and research gaps
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This systematic review of 84 studies finds that seagrass meadows act as natural traps for microplastics, accumulating higher concentrations in their sediments than surrounding areas. While this filtering role may protect open waters, it also means these important coastal ecosystems are bearing a disproportionate burden of plastic pollution.
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.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.