MPs were classified into four size categories: >0.5–1 mm,>1–2.5 mm, >2.5–5 mm and >5 mm. In both two research areas,plastics (<5 mm) comprised more than 90% of total abundance(Table 4). The average MP size in the Yangtze Estuary and EastChina Sea were 0.90 ± 0.74 mm (range: 0.51–6.29 mm) and2.01 ± 2.01 mm (range: 0.5–12.46 mm), respectively. Smaller plasticfragments have been classified either as large MP (L-MPP,1–5 mm) or small MP particles (S-MPP, 61 mm) (Imhof et al.,2012). S-MMP in the Yangtze Estuary and East China Sea accountedfor 67.0% and 35.4%, respectively. Our findings implied that the abundance of plastic items increased with the decreasing size ofsuch items (Barnes et al., 2009; Doyle et al., 2011). These plasticfragments constitute a frequently reported size inventory in manyingestion studies (Eriksson and Burton, 2003; Foekema et al., 2013;Graham and Thompson, 2009). The size range of MP determinesthe potential impact of these contaminants on ecosystembiota (Mohamed Nor and Obbard, 2014). Dominance of smallerparticles increases the risks related to encounter frequency. SMPPswere easily found in filter feeders in contrast to L-MPPswhich were found frequently in carnivorous taxa (Foekema et al.,2013).
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