Microplastics as novel sedimentary particles in coastal wetlands: A review
2020
Paduani, Melinda
Coastal wetlands are often neglected in marine debris studies. Interactions of plastics with natural particles are also largely understudied across all ecosystems but are becoming the focus of an emerging field on plastic cycling. Some studies have investigated short-term interactions, and some models predict short turnover times at the sediment surface on open shorelines. However, buried plastics may be retained longer in wetlands where accretion is often high, and some studies suggest their use as historical markers. The ubiquity, persistence, and behavior of plastic particles within wetlands warrants their consideration as novel sedimentary particles. Viewing plastics in this context will allow land managers to better predict how these vulnerable systems respond to increasing inputs of plastic pollution. This review evaluates debris distributions in coastal wetland sediments, heteroaggregation, plastic degradation within sediments, and persistence of plastic in the sedimentary record to highlight knowledge gaps and opportunities in this rapidly developing field.
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