Department of Environmental Health Science, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea.
Department of Environmental Health Science, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea.
Sci Total Environ. 2019 Feb 1;649:156-162. doi: 10.1016/j.scitotenv.2018.08.310. Epub 2018 Aug 23.
This study investigated the ingestion behavior of zebrafish exposed to microplastic particles (MPs) at different concentrations, presented alone or in a mix with food particles. Zebrafish showed spitting behavior after ingesting micro-sized (247.5 μm) polyethylene particles (i.e., MPs), with prey-capture time increasing when food and MPs were supplied simultaneously. Fish were compelled to ingest MPs with food, and the accumulation percentage (ingested particles/supplied particles) was quantified as 0.5 to 9.4% with increasing food volume. However, the accumulation percentage was determined as 0.0 to 1.0% under exposure to MPs only, and as 3.8 to 4.3% at high MP concentrations when the food concentration was fixed. Overall, these results demonstrate that small freshwater organisms can recognize that MPs are not food items. Under laboratory conditions, zebrafish rarely discriminate between food and MPs when both are presented together, and the indiscriminate feeding behavior becomes clearer as more food is available.
本研究调查了在不同浓度下暴露于微塑料颗粒（MPs）的斑马鱼的摄食行为，这些 MPs 单独存在或与食物颗粒混合存在。斑马鱼在摄入微尺寸（247.5 μm）聚乙烯颗粒（即 MPs）后表现出吐食行为，同时提供食物和 MPs 时，捕食时间增加。鱼被迫与食物一起摄入 MPs，并且随着食物量的增加，积累百分比（摄入颗粒/供应颗粒）被量化为 0.5 到 9.4%。然而，仅暴露于 MPs 时，积累百分比为 0.0 到 1.0%，而当食物浓度固定时，在高 MP 浓度下，积累百分比为 3.8 到 4.3%。总体而言，这些结果表明，小型淡水生物可以识别出 MPs 不是食物。在实验室条件下，当同时存在食物和 MPs 时，斑马鱼很少对它们进行区分，并且随着食物的增加，这种不分青红皂白的摄食行为变得更加明显。
