Particle shape does not affect ingestion and egestion of microplastics by the freshwater shrimp Neocaridina palmata

  • The ingestion of microplastics (MPs) is well documented for various animals and spherical MPs (beads) in many studies. However, the retention time and egestion of MPs have been examined less, especially for irregular MPs (fragments) which are predominantly found in the environment. Furthermore, the accumulation of such particles in the gastrointestinal tract is likely to determine whether adverse effects are induced. To address this, we investigated if the ingestion and egestion of beads are different to those of fragments in the freshwater shrimp Neocaridina palmata. Therefore, organisms were exposed to 20–20,000 particles L−1 of either polyethylene (PE) beads (41 μm and 87 μm) or polyvinyl chloride (PVC) fragments (<63 μm). Moreover, shrimps were exposed to 20,000 particles L−1 of either 41 μm PE and 11 μm polystyrene (PS) beads or the PVC fragments for 24 h, followed by a post-exposure period of 4 h to analyze the excretion of particles. To simulate natural conditions, an additional fragment ingestion study was performed in the presence of food. After each treatment, the shrimps were analyzed for retained or excreted particles. Our results demonstrate that the ingestion of beads and fragments were concentration-dependent. Shrimps egested 59% of beads and 18% of fragments within 4 h. Particle shape did not significantly affect MP ingestion or egestion, but size was a relevant factor. Medium- and small-sized beads were frequently ingested. Furthermore, fragment uptake decreased slightly when co-exposed to food, but was not significantly different to the treatments without food. Finally, the investigations highlight that the assessment of ingestion and egestion rates can help to clarify whether MPs remain in specific organisms and, thereby, become a potential health threat.
Author:Kristina KleinORCiDGND, Sebastian HeßGND, Sandra Nungeß, Ulrike Schulte-OehlmannORCiDGND, Jörg OehlmannORCiDGND
Parent Title (English):Environmental science and pollution research
Place of publication:Berlin ; Heidelberg
Document Type:Article
Date of Publication (online):2021/06/29
Date of first Publication:2021/06/29
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2022/05/10
Tag:Crustacea; Excretion; Freshwater invertebrate; Microplastic; Neocaridina palmata; Polymer; Uptake
Page Number:9
First Page:62246
Last Page:62254
Open Access funding enabled and organized by Projekt DEAL. The study was funded by the German Federal Ministry of Education and Research (BMBF) within the framework of the funding measure “Plastics in the Environment – Sources • Sinks • Solutions” and “Research for Sustainable Development – FONA3” under the project “PLASTRAT” (project identifier: 02WPL1446B).
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 57 Biowissenschaften; Biologie / 570 Biowissenschaften; Biologie
3 Sozialwissenschaften / 33 Wirtschaft / 333 Boden- und Energiewirtschaft / 333.7 Natürliche Ressourcen, Energie und Umwelt
Licence (German):License LogoCreative Commons - Namensnennung 4.0