Bivalves are a significant source of seafood for people, but so far there have been many studies revealing the presence of microplastics (MPs) in bivalves, yet the role of bivalve biometric parameters in link with MP burden in bivalves remains underexplored. Here we collected published data and found that the study region for MPs in bivalves was spread across the globe, reporting approximately 40,000 bivalves and comprising 102 species in 22 families. A linear positive correlation was obtained between average MP abundance (items/individual) and average shell length of bivalves, while a negative exponential relationship between average MP abundance (items/g) and average shell length of bivalves was found. This suggested that larger bivalves tend to contain more MPs (items/individual), but MP abundance (items/g) tends to be lower in larger bivalves. It was conservatively estimated that the annual dietary intake of MPs of bivalves from global 21 countries reached 6.39 × 10¹² MPs in 2022. Besides, the study found that the soft tissue wet weight of bivalves is an available parameter to estimate the abundance of MPs in bivalves from markets and aquafarms. The findings of this study will provide valuable information that would help to better understand the global bivalve MP contamination character.

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从全球存档数据的角度来看：更大的双壳类意味着更多的塑料微粒？

双壳类是人类海鲜的重要来源，但到目前为止，有许多研究揭示了双壳类中存在微塑料 （MP），但双壳类生物识别参数与双壳类 MP 负担有关的作用仍未得到充分探索。在这里，我们收集了已发表的数据，发现双壳类 MP 的研究区域遍布全球，报告了大约 40,000 种双壳类，包括 22 个科的 102 个物种。平均 MP 丰度（项目/个体）与双壳类的平均壳长之间呈线性正相关，而发现平均 MP 丰度（项目/g）与双壳类的平均壳长之间存在负指数关系。这表明较大的双壳类往往含有更多的 MP （项目/个），但较大的双壳类的 MP 丰度 （项目/g） 往往较低。保守估计，2022 年全球 21 个国家的双壳类 MP 年膳食摄入量达到 6.39 ×^{10 12} MP。此外，研究发现，双壳类的软组织湿重是估计市场和水产养殖场双壳类中 MP 丰度的可用参数。这项研究的结果将提供有价值的信息，有助于更好地了解全球双壳类 MP 污染特征。