- Citizen scientists correctly identified plastics or rubber in 93% of particles.
- Concentrations varied from 0 to >2500 particles m−2 with accumulation gradients.
- No significant spatiotemporal microplastic variation was measured over a year.
- Localised high densities of polyethylene pellets were recorded on one island.
- Simple quadrat/sieve method offers accessible beach microplastic monitoring option.
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