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Evaluating microplastic trapping efficiency in seagrass meadows using hydraulic flume simulations
Summary
Researchers used hydraulic flume simulations to test how seagrass meadow configuration—random vs. grid planting, different densities—affects microplastic trapping efficiency. Randomly distributed meadows were 6% more effective at high MP concentrations, and lower planting densities improved trapping by 14%, suggesting seagrass restoration design could be optimized to maximize MP capture as a nature-based solution.
Microplastic (MP) pollution poses a significant environmental threat, with projections indicating a 50-fold increase in pollution levels by 2100. Seagrass meadows, important for carbon storage and sediment stabilisation, may also serve as a Nature-based Solution for MP pollution. Despite the well-documented presence of MPs in seagrass sediments, the efficiencies of MP capture by these habitats remain largely unexplored. In this study, hydraulic flume simulations were conducted to assess how different seagrass planting configurations influence MP trapping. The results indicate that meadows with random spatial distribution are 6 % more effective at trapping MPs under high concentrations compared to grid-patterned meadows, while lower planting densities enhance trapping efficiency by 14 %. These findings offer insights into optimising seagrass restoration efforts for mitigating MP pollution, and this highlights the need for further needed to understand the broader ecological implications of MP retention in these critical ecosystems.