Microplastics in the New Zealand green lipped mussel Perna canaliculus

Microplastic Contamination of Seafood Intended for Human Consumption: A Systematic Review and Meta-Analysis

“…The two studies by J Li et al (2015 were determined to be statistical outliers of extremely large effect (Figure 4). An influence analysis also identified the same studies as the most influential studies in terms of contribution to the effect size ( Figure S6A), whereas the study by Webb et al (2019) was found to be the major contributor to the heterogeneity I 2 ( Figure S6B) and a major influence on the pooled result ( Figure S7). The geographical origin of the samples was also found to be associated with significant differences in the MP content (Q = 949:96, p < 0:01), but no significant differences of the source of the samples was found [environment, n = 9; market, n = 3 (Q = 0:38, p = 0:54)] (Table S11).…”

“…Seven studies were rated as having a high RoB because they did not report the results for the analysis of their procedural blanks (Hermabessiere et al 2019;HX Li et al 2018;Thushari et al 2017;Webb et al 2019;Wu et al 2020;SY Zhao et al 2018) (Table S7), an analysis step that was rated as one of the most important questions in the RoB assessment tool. Five of these studies reported MP content >1 MP=g and the rest, <1 MP=g.…”

“…The remaining 21 studies (68%) reported percentages ranging from 0.9% to 100%. Eight studies (26%) analyzed 100% of the particles (Cho et al 2019;Ding et al 2018Ding et al , 2019Ding et al , 2020Nam et al 2019;Phuong et al 2018a;Webb et al 2019;Wu et al 2020), one 80% (Hermabessiere et al 2019), and the rest 0.9-36% (Table S9). Following on from this, it is noteworthy that 16 (52%) of the studies, once these particles have been isolated, did not state the percentage of similarity compared with the spectral library that was used as the level of acceptance.…”

“…The RoB rating analysis showed that there was a significant difference between the three ratings (Q = 13:11, p < 0:01). In light of these results, in order to improve the quality of the data, we fitted a model omitting the results of the three studies rated as of high RoB (Hermabessiere et al 2019;Webb et al 2019;SY Zhao et al 2018). The results of the model are shown in Figure 5, where MP content was 0:71 MPs=g [(95% CI: 0.50, 0.92), p < 0:01], and heterogeneity was high (I 2 = 99:3%, chi-square = 1,170:31, p < 0:01).…”

“…After the completion of the separate analysis for each family of mollusks, a random-effects model was fitted, again including studies for all families but excluding the five high-RoB studies (Baechler et al 2020;Hermabessiere et al 2019;Webb et al 2019;SY Zhao et al 2018) ( Figure S9). The mean content was 0:78 MPs=g [(95% CI: 0.58, 0.97), p < 0:01] and heterogeneity was still high (I 2 = 99:8%, chi-square = 14,491:45, p < 0:01).…”