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Seasonal distribution of microplastics in an urban estuarine system, Perth, Western Australia

The University of Western Australia 2026
Thomas Crutchett

Summary

Researchers studied microplastic contamination in an urban estuary in Perth, Australia, and found that the season significantly influenced how much plastic was found in the water's surface, though not in the sediment. The study highlights the complexity of tracking microplastics in connected water systems and provides data to help guide management of urban waterways.

Urban estuaries are recognised as hotspots for microplastics, which are ubiquitous environmental contaminants that threaten ecological health. Despite these concerns, knowledge of microplastic contamination in Australian estuaries remains limited, and further research into environmental drivers is necessary. This thesis investigates contamination in an understudied urban estuary and determines that seasonality is a significant driver of microplastic abundance in surface water but not in intertidal sediments. Overall, I demonstrate the complexity of estuarine-based microplastic research and provide insights into the contamination of interconnected substrates, which can inform management strategies in urban catchments.

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