Microplastic pollution on Caribbean beaches in the Lesser Antilles

Area of Science:

• Environmental Science
• Marine Biology
• Ecotoxicology

Background:

• Beaches in the Lesser Antilles are proximate to the North Atlantic subtropical gyre, a known accumulation zone for microplastics.
• Understanding microplastic pollution is crucial for marine ecosystems, particularly in biodiversity hotspots like the Caribbean.

Purpose of the Study:

• To quantify and characterize microplastic contamination on beaches across four islands in the Lesser Antilles.
• To compare microplastic levels among islands and between different beach types (windward vs. leeward).

Main Methods:

• Sampling of dry sand from beaches on Anguilla, St. Barthélemy, St. Eustatius, and St. Martin/Maarten.
• Quantification of microplastics per kilogram of dry sand.
• Identification of microplastic types, with a focus on fibers.

Main Results:

• An average of 261 ± 6 microplastics per kg of dry sand was detected across the studied beaches.
• Microplastic fibers constituted over 95% of the total microplastics found.
• St. Eustatius exhibited significantly lower microplastic contamination compared to Anguilla, St. Barthélemy, and St. Martin/Maarten.
• No significant difference in microplastic levels was observed between windward and leeward beaches.

Conclusions:

• The study provides a comprehensive assessment of microplastic contamination on Lesser Antilles beaches.
• Findings highlight the widespread nature of microplastic pollution in the Caribbean, impacting a critical biodiversity hotspot.
• Results underscore the need for targeted strategies to mitigate microplastic pollution in the region.