Sampalo Marta, Gómez May, Almeda Rodrigo
EOMAR, ECOAQUA, University of Las Palmas of Gran Canaria (ULPGC), Spain.
EOMAR, ECOAQUA, University of Las Palmas of Gran Canaria (ULPGC), Spain.
Ecotoxicol Environ Saf. 2025 Feb;291:117787. doi: 10.1016/j.ecoenv.2025.117787. Epub 2025 Feb 4.
Tire wear particles (TWP) are a major source of microplastics in the environment. Despite their prevalence, the effects of tire particle leachates on marine microplankton communities remains poorly understood. In this study, we assessed the acute impacts of tire particle leachates on the structure of coastal microplankton assemblages from the Canary Islands. Five laboratory experiments were conducted, exposing microplankton to a range of leachate dilutions over 72 h, with TWP leachates prepared from an initial concentration of 1 g L⁻¹ .Our results revealed that the abundances of diatoms, most dinoflagellates, and ciliates were significantly reduced following exposure to leachates, with median effective concentrations (EC) ranging from 30 to 660 mg L depending on the plankton community. Interestingly, Ostreopsis cf. ovata, a harmful algal bloom (HAB)-forming species, exhibited relatively high tolerance to tire particle leachates compared to other microplankton. Compared to other marine biota, ciliates appear to be most vulnerable plankton group to tire particle leachates (EC = 30 and 146 mg L). The higher tolerance of O. cf. ovata to pollution compared to other phytoplankton species (resource competitors), in combination with other factors, may contribute to the rise of HABs in polluted coastal areas. Although field data on TWP are limited, the observed negative effects on microplankton occurred at environmentally relevant concentrations. Our results indicate that TWP pollution can significantly impact marine planktonic communities, highlighting the urgent need to reduce TWP emissions and develop less toxic tire rubber additives.
轮胎磨损颗粒（TWP）是环境中微塑料的主要来源。尽管它们普遍存在，但轮胎颗粒渗滤液对海洋微浮游生物群落的影响仍知之甚少。在本研究中，我们评估了轮胎颗粒渗滤液对加那利群岛沿海微浮游生物组合结构的急性影响。进行了五项实验室实验，在72小时内将微浮游生物暴露于一系列渗滤液稀释液中，TWP渗滤液初始浓度为1 g L⁻¹ 。我们的结果表明，暴露于渗滤液后，硅藻、大多数甲藻和纤毛虫的丰度显著降低，根据浮游生物群落的不同，半数有效浓度（EC）范围为30至660 mg L 。有趣的是，卵形仿奥氏藻（Ostreopsis cf. ovata）是一种形成有害藻华（HAB）的物种，与其他微浮游生物相比，它对轮胎颗粒渗滤液表现出相对较高 的耐受性。与其他海洋生物群相比，纤毛虫似乎是对轮胎颗粒渗滤液最敏感的浮游生物群体（EC = 30和146 mg L）。与其他浮游植物物种（资源竞争者）相比，卵形仿奥氏藻对污染的耐受性更高，再加上其他因素，可能导致污染沿海地区有害藻华的增加。尽管关于TWP的现场数据有限，但在与环境相关的浓度下观察到了对微浮游生物的负面影响。我们的结果表明，TWP污染会显著影响海洋浮游生物群落，突出了减少TWP排放和开发毒性较小的轮胎橡胶添加剂的迫切需要。
