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Influencia de las condiciones ambientales sobre la distribución y tipos de microplásticos en aguas superficiales en la bahía de Tumaco, Pacífico colombiano
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Researchers assessed the spatiotemporal influence of environmental variables on microplastic abundance and distribution in the surface waters of Tumaco Bay, Colombian Pacific, during wet and dry seasons in 2020. Microplastic abundance was higher in the dry season (11.40 items/m3) and the inner estuary (8.42 items/m3), fibers were dominant (53.89%), and salinity and total dissolved solids were significantly correlated with fiber concentrations.
Los microplásticos (MP) suponen una gran problemática ambiental para las zonas estuarinas, al estar expuestas a múltiples fuentes de desechos plásticos. En este estudio, se evaluó la influencia espacio-temporal de variables ambientales sobre la abundancia, distribución y tipos de MP en la bahía de Tumaco. Las muestras se recolectaron en épocas de lluvia y seca de 2020, en el estuario interno yexterno, y se procesaron mediante separación por densidad. La abundancia de MP fue mayor en época seca (11.40 ± 2.60 ítems/m³) y en el estuario interno (8.42 ± 4.91 ítems/m³). Las fibras fueron el tipo de MP más abundante (53.89 %). Se correlacionaron significativamente lasalinidad y solidos totales disueltos (TDS) con fibras, y la precipitación con fragmentos, láminas y MP totales. Estos resultados demuestran alta contaminación (8.13 ítems/m³) y un aumento de la concentración de MP en la bahía. Esto podría estar relacionado con la exposición a los residuos transportados por los ríos. Por otra parte, la mayor abundancia de MP en la época seca podría deberse a una disminución en la dispersión por una menor entrada de agua al sistema, y al aumento de la densidad del agua, relacionado con el incremento en la salinidad,que favorece la flotabilidad de MP.
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Incremento de la contaminación por microplásticos en aguas superficiales de la bahía de Buenaventura, Pacífico colombiano
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Researchers measured microplastic concentrations in surface waters of Buenaventura Bay on Colombia's Pacific coast and found levels had increased compared to earlier surveys. Fibers were the most common type, likely from textile washing and fishing activities in the region. This is one of few studies documenting microplastic pollution on Colombia's Pacific coast.
Abundance, distribution, and characteristics of microplastics in coastal surface waters of the Colombian Caribbean and Pacific
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This study documented microplastic abundance, distribution, and characteristics across Colombian Caribbean and Pacific coastal surface waters during the 2017 rainy season, finding concentrations up to 8.96 items per square meter and establishing the first national baseline for microplastic pollution in Colombian coastal waters.
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Researchers found that plastic litter in two remote Colombian Pacific mangrove estuaries was dominated by microplastics, with higher abundances during high-rainfall seasons in both surface waters and sediments, and foams and fragments being the most common types.
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Researchers assessed microplastic abundance on three beaches in Las Tablas district, Panama during August and October 2022, finding densities of 9.2 to 37.2 items/m2 with fragments and fibers as the dominant morphotypes, representing baseline data for this previously unstudied Pacific coastline.
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