Ingestion of Tire Wear Microplastics Causes Potential Neurological Harm in Planarians, Manifested as Slower Phototaxis
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Abstract

Microplastic pollution has increased over the past decade and is causing detrimental effects on living organisms. While research on microplastics and their impacts on ecosystems is expanding, specific investigations of tire wear particles (TWP) are limited. This experiment focuses on tire wear particles’ effect on planaria’s phototaxis response. In an 8-week experiment, planarians were fed TWP-dosed food and then observed for a possible delay in phototactic behavior. Current research suggests that TWP will increase the time for planaria to move away from light due to possible neurological damage. To conduct this research, the liver paste was mixed with varying concentrations of tire wear as food for eight weeks. Each week, the duration of a repeatable phototactic response was measured in the control and test planaria. Results show that the 1.5% concentration of (TWP) in the liver paste negatively impacts the planaria phototaxis, reflected by increased time to evade a light source. These results can be applied directly to the evolutionary selection of wild planaria and indirectly to human health.

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