Microplastic pollution along the Ningaloo Coast World Heritage Area: Local source contributions within a remote marine protected area

Microplastic pollution is present at all beaches along the Ningaloo Coast World Heritage Area (NCWHA), despite its remote and protected status. This study, the first quantitative assessment of microplastics (MPs) in this region, found concentrations ranging from 0 to 8.5 MPs per liter of sediment, with significant spatial variability influenced by proximity to boat ramps, distance to townships, and beach aspect—higher concentrations were observed on north-west facing beaches. Polyethylene terephthalate (PET) and polypropylene (PP) dominated the polymer composition, while manufactured fibers accounted for 72.4% of MP shapes. The findings suggest that local human activities contribute to MP inputs, with natural processes potentially dispersing them. This baseline data is critical for future monitoring and targeted management interventions, particularly at high-use access points.

Hill, N., Santana, M. F. M., Hovey, R., Motti, C. A., Serra-Gonçalves, C., Yau, G. D., Jaworski, S., & Galaiduk, R. (2026). Microplastic pollution along the Ningaloo Coast World Heritage Area: Local source contributions within a remote marine protected area. Marine Pollution Bulletin, 233, 120326. https://doi.org/10.1016/j.marpolbul.2026.120326