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Impact of polyester and cotton microfibers on growth and sublethal biomarkers in juvenile mussels
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Researchers exposed juvenile mussels to polyester and cotton microfibers at realistic ocean concentrations for 94 days and found that polyester microfibers reduced mussel growth rates by up to 36%, suggesting that microplastic fiber pollution could harm marine ecosystems and threaten shellfish aquaculture.
Abstract Anthropogenic microfibres are a prevalent, persistent and globally distributed form of marine debris. Evidence of microfibre ingestion has been demonstrated in a range of organisms, including Mytilus spp. (mussels), but the extent of any impacts on these organisms are poorly understood. This study investigates, for the first time, the effect of exposing juvenile mussels to polyester and cotton microfibres at environmentally relevant concentrations (both current and predicted future scenarios) over a chronic timescale (94 days). Sublethal biomarkers included growth rate, respiration rate and clearance rate. Mussels were exposed to polyester (median length 149 µm) and cotton (median length 132 µm) microfibres in three treatments: polyester (~ 8 fibres L −1 ), polyester (~ 80 fibres L −1 ) and cotton (~ 80 fibres L −1 ). Mussels exposed to 80 polyester or cotton microfibres L −1 exhibited a decrease in growth rate of 35.6% (polyester) and 18.7% (cotton), with mussels exposed to ~ 80 polyester microfibres L −1 having a significantly lower growth rate than the control population ( P < 0.05). This study demonstrates that polyester microfibres have the potential to adversely impact upon mussel growth rates in realistic future scenarios, which may have compounding effects throughout the marine ecosystem and implications for commercial viability. Graphical Abstract
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