Exposure of the amphipod Hyalella azteca to microplastics. A study on subtoxic responses and particle biofragmentation.

Autor: Rani-Borges B; Institute of Science and Technology, São Paulo State University, UNESP, 3 de Março Avenue 511, Alto da Boa Vista, Sorocaba 18087-180, Brazil; Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, USP, Prof. Lineu Prestes Avenue 748, São Paulo 05508-000, Brazil. Electronic address: barbara.rani-borges@usp.br., Queiroz LG; Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, USP, Prof. Lineu Prestes Avenue 748, São Paulo 05508-000, Brazil; Department of Ecology, Institute of Biosciences, University of São Paulo, USP, Matão Street 321, São Paulo 05508-090, Brazil., Prado CCA; Department of Biotechnology, School of Engineering, University of São Paulo, USP, Municipal do Campinho Road, Lorena 12602-810, Brazil., de Melo EC; Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, USP, Prof. Lineu Prestes Avenue 748, São Paulo 05508-000, Brazil., de Moraes BR; Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, USP, Prof. Lineu Prestes Avenue 748, São Paulo 05508-000, Brazil., Ando RA; Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, USP, Prof. Lineu Prestes Avenue 748, São Paulo 05508-000, Brazil., de Paiva TCB; Department of Biotechnology, School of Engineering, University of São Paulo, USP, Municipal do Campinho Road, Lorena 12602-810, Brazil., Pompêo M; Department of Ecology, Institute of Biosciences, University of São Paulo, USP, Matão Street 321, São Paulo 05508-090, Brazil.
Jazyk: angličtina
Zdroj: Aquatic toxicology (Amsterdam, Netherlands) [Aquat Toxicol] 2023 May; Vol. 258, pp. 106516. Date of Electronic Publication: 2023 Mar 30.
DOI: 10.1016/j.aquatox.2023.106516
Abstrakt: Microplastics are widespread pollutants in the environment and are considered a global pollution problem. Microplastics mostly originate from larger plastics and due to environmental conditions are undergoing constant fragmentation processes. It is important to understand the fragmentation pathways, since they play a key role in the fate of the particles, and also directly influence toxicity. Amphipods are potential inducers of plastic debris fragmentation. Here, Hyalella azteca was exposed to different concentrations (540, 2700, 5400 items/L) of 24.5 µm polystyrene microplastics (PS-MP) for 7 days. After exposure, oxidative stress, particle size reduction, and mortality were checked. No significant mortality was seen in any of the treatments, although changes were recorded in all enzymatic biomarkers analyzed. It was observed that throughout the ingestion and egestion of PS-MP by H. azteca, particles underwent intense fragmentation, presenting a final size up to 25.3% smaller than the initial size. The fragmentation over time (24, 72, 120, 168 h) was verified and the results showed a constant reduction in average particle size indicating that H. azteca are able to induce PS-MP fragmentation. This process may facilitate bioaccumulation and trophic particle transfer.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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