Effects of food quantity on the ingestion and egestion of MPs with different colors by Daphnia magna,Aquatic Toxicology

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Effects of food quantity on the ingestion and egestion of MPs with different colors by Daphnia magna
Aquatic Toxicology ( IF 4.1 ) Pub Date : 2024-05-27 , DOI: 10.1016/j.aquatox.2024.106976
Danhua Lan ₁ , Hua He ₁ , Xueyi Song ₁ , Yini Ma ₁

Affiliation

Aquatic organism uptake and accumulate microplastics (MPs) through various pathways, with ingestion alongside food being one of the primary routes. However, the impact of food concentration on the accumulation of different types of MPs, particularly across various colors, remains largely unexplored. To address this gap, we selected as a model organism to study the ingestion/egestion kinetics and the preference for different MP colors under varying concentrations of . Our findings revealed that as the concentration of increased, the ingestion of MPs by initially increased and then showed a decline. During the egestion phase within clean medium without further food supply, an increase in food concentration during the ingestion phase led to a slower rate of MP discharge; while when food was present during the egestion phase, the discharge rate accelerated for all treatments, indicating the importance of food ingestion/digestion process on the MPs bioaccumulation. Furthermore, in the presence of phytoplankton, demonstrated a preference for ingesting green-colored MPs, especially at low and medium level supply, possibly due to the enhanced food searching activities. Beyond gut passage, we also examined the attachment of MPs to the organism's body surface, finding that the number of adhered MPs increased with increasing food concentration, likely due to the intensified filtering current during food ingestion. In summary, this study demonstrated that under aquatic environment with increasing phytoplankton concentrations, the ingestion and egestion rates, color preferences, as well as surface adherence of MPs to filter feeding zooplanktons will be significantly influenced, which may further pose ecological risks. Our results offer novel insights into the unintentional accumulation of MPs by zooplankton, highlighting the complex interactions between food availability and MPs accumulation dynamics.

中文翻译：

食物量对大型溞摄食和排泄不同颜色MP的影响

水生生物通过各种途径吸收和积累微塑料 (MP)，其中与食物一起摄入是主要途径之一。然而，食物浓度对不同类型 MP 积累的影响，特别是各种颜色的影响，在很大程度上仍未得到探索。为了解决这一差距，我们选择了一种模式生物来研究不同浓度下的摄取/消化动力学以及对不同 MP 颜色的偏好。我们的研究结果表明，随着浓度的增加，MP 的摄入量最初增加，然后呈下降趋势。在没有进一步食物供给的清洁介质内的消化阶段，摄取阶段食物浓度的增加导致MP排出速率减慢；而当消化阶段存在食物时，所有处理的排出速率都会加快，这表明食物摄入/消化过程对 MPs 生物累积的重要性。此外，在存在浮游植物的情况下，表现出对摄入绿色 MP 的偏好，尤其是在低水平和中等水平的供应情况下，这可能是由于食物搜索活动的增强。除了肠道通道之外，我们还检查了 MP 在生物体表面的附着情况，发现粘附的 MP 数量随着食物浓度的增加而增加，这可能是由于食物摄入期间过滤电流的增强。综上所述，本研究表明，在浮游植物浓度增加的水生环境下，MPs对滤食性浮游动物的摄食和排泄率、颜色偏好以及表面粘附都会受到显着影响，从而可能进一步带来生态风险。我们的研究结果为浮游动物无意积累 MP 提供了新颖的见解，强调了食物供应与 MP 积累动态之间复杂的相互作用。

更新日期：2024-05-27

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