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Testing a monitoring strategy for floating microlitter with manta-trawl sampling in Danish coastal waters
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This Danish monitoring project developed and tested a coastal sampling strategy for floating microplastics using manta-trawls at beach litter monitoring sites. The study found relatively low microplastic concentrations in Danish marine surface waters, providing baseline data and an evaluated monitoring protocol for ongoing national microplastic surveillance.
The objective of the present project was to develop and test a coastal monitoring strategy for floating microlitter and microplastic (MP) in Danish marine surface waters using manta-trawl as sampling gear. 15 samples collected in transects along beach litter monitoring sites and analysed for MP > 300 µm. The median MP concentration was 0.057 particles m-3 and the maximum concentration was 0.213 particles m-3 indicating relatively low contamination levels of the seven investigated marine surface waters. This corresponded to a median value of 14630 MP per km2 and a maximum value of 43639 MP per km2. Other aspects considered include recommendation on sampling minimum of 100 m3 sample volume, to analyse replicate samples and that sampling should be planned in spring/early summer.
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Microplastic analysis in the South Funen Archipelago, Baltic Sea, implementing manta trawling and bulk sampling
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Researchers assessed microplastic contamination in the surface waters of the South Funen Archipelago in the Baltic Sea using manta trawls and bulk water sampling, finding slightly lower concentrations (0.07 particles/m3) than other regional studies, which was attributed to the sheltered location and low local population pressure. The study also found that low-volume bulk samples were not comparable to manta trawl results due to insufficient sample representativeness.
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Researchers compared manta trawl and submersible pump sampling methods for marine microlitter in the Gulf of Finland, finding that a pump with a 100 µm filter yielded higher concentrations than a manta trawl or pump with 300 µm filter, and recommending 100 µm or smaller mesh for monitoring environmentally relevant size fractions.
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Researchers sampled microplastics from sea-surface waters surrounding Sweden using both manta trawls and in-situ pumps at 12 locations, finding that pump samples consistently detected higher concentrations than trawl samples and that fibers were present in all samples with the highest concentrations on the west coast.
Replicating success: sampling microplastics in environments of low pollution levels
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Researchers tested the optimal number of replicate samples needed for reliable microplastic monitoring in low-pollution environments by collecting 15 consecutive Manta net trawls across two Icelandic water bodies, concluding that a minimum of three replicas is required and that sampling volume measurement is more reliable than distance-based calculation.
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AI summary Read the abstract
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Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.