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Do tidal fluctuations affect microplastics distribution and composition in coastal waters?
Gabriel Pasquier1, Périne Doyen2, Iseline Chaïb1
1Univ. Littoral Côte d'Opale, CNRS, IRD, Univ. Lille, UMR 8187 - LOG - Laboratoire d'Océanologie et de Géosciences, F-62930 Wimereux, France.
Marine Pollution Bulletin
|February 20, 2024
Summary
Tidal fluctuations do not significantly alter microplastic (MP) abundance or composition between spring and neap tides. However, tidal currents and water height influence MP characteristics within a single tidal cycle, necessitating consideration for coastal pollution surveys.
Area of Science:
- Environmental Science
- Marine Biology
- Oceanography
Background:
- Hydro-meteorological conditions significantly impact microplastic (MP) transport and dispersion in marine environments.
- The specific influence of tidal fluctuations on MP pollution remains poorly understood, particularly in megatidal coastal waters.
Purpose of the Study:
- To investigate the effects of tidal fluctuations on the abundance and composition of microplastics (MPs) in a megatidal coastal environment.
- To assess whether distinct tidal cycles (spring vs. neap) result in significant differences in MP characteristics.
Main Methods:
- Water samples were collected over two complete tidal cycles (spring and neap tide) at 90-minute intervals.
- Analyzed MP abundance, size, morphology, and polymer types in collected samples.
Main Results:
- No significant disparities in MP abundance, size, or composition were observed between spring and neap tide samples.
- MP abundance and characteristics (morphology, size, polymer types) showed variations within a single tidal cycle, influenced by tidal currents and water height.
Conclusions:
- While differences between spring and neap tides were not significant, tidal cycle fluctuations are crucial for understanding MP dynamics.
- In-situ surveys for assessing coastal microplastic pollution must account for tidal cycle variations to ensure accurate data collection.
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