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Advances in the aquatic sciences
RESEARCH ARTICLE

Is the Paraíba do Sul River colourful? Prevalence of microplastics in freshwater, south-eastern Brazil

Igor D. da Costa https://orcid.org/0000-0002-8556-5507 A B * , Natalia N. S. Nunes C , Leonardo L. Costa D and Ilana R. Zalmon D
+ Author Affiliations
- Author Affiliations

A Departamento de Ciências Exatas, Biológicas e da Terra, Universidade Federal Fluminense (UFF), Avenida João Jasbick s/n, Bairro Aeroporto, Santo Antônio de Pádua, RJ CEP: 28470-000, Brazil.

B Mestrado Profissional em Gestão e Regulação de Recursos Hídricos (PROF-ÁGUA), Universidade Federal de Rondônia, Ji-Paraná, RO, Brazil.

C Programa de Pós-Graduação em Ciências Ambientais, Universidade Federal de Rondônia, Rolim de Moura, RO, Brazil.

D Laboratório de Ciências Ambientais, Universidade Estadual do Norte Fluminense (UENF), Campos dos Goytacazes, RJ, Brazil.

* Correspondence to: igorbiologia@yahoo.com.br

Handling Editor: Fiona Dyer

Marine and Freshwater Research 73(12) 1439-1449 https://doi.org/10.1071/MF22109
Submitted: 28 May 2022  Accepted: 3 September 2022   Published: 27 September 2022

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context: Plastic pollution can be even more problematic to the environment when this material is fragmented into small pieces forming microplastics (MPs).

Aims: The objectives of the present study were to investigate the abundance, morphotypes, predominant polymers, and colour of MPs on surface waters, and compare the effect of the hydrologic cycle on the abundance and richness of MP categories along a stretch of the Paraíba do Sul River basin, the water system of which flows through the most populous area in Brazil.

Methods: Samples were taken from the superficial layer of the water column in high-water and low-water periods 2021, using bottles and plankton net.

Key results: In total, 15 categories of MP were determined and 290 plastic particles were collected in both periods. A greater abundance of MPs was found during the high-water period than in the low-water period, considering both sampling methods.

Conclusions: The MPs in the surface waters of the Paraíba do Sul River are significantly influenced by the rainfall regime.

Implications: In view of climate change, which encompasses an increase in the frequency and intensity of river floods, our results present significant implications for the management of MPs in riverine and marine systems, within the context of global climatic alterations.

Keywords: disturbance, flooding, freshwater, hydrology, lotic, pollution, surface water, water column.


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