Microplastics pollution in the South American Pantanal

Abstract

Microplastics represent an emerging global threat to freshwater ecosystems and studies in floodplains are still incipient. Microplastics in the Pantanal’s affluent and floodplains were sampled close to their potential urban sources and in the Pantanal lowlands. A 68 μm mesh size plankton net, with a 150 ml collection flask was used for sampling. The flask content was filtered over a 0.45μm Whatman paper, 47 mm in diameter, and examined under a stereomicroscope at 45X to identify and count microplastics (expressed as n100L-1). Microplastic sizes were determined by image microscopy. The average microplastic size was 192±142 μm and it was not significantly different in the urban tributaries (206±158 μm) than in the Pantanal (181±131 μm). The average±std microplastic concentration was 9.6±8.3, ranging from 1 to 31 n100L-1. Fibers, fragments, pellets, and XPS (closed-cell extruded polystyrene foam) particles represented respectively 50%, 19%, 22% and 9% of the total microplastics. Microplastics concentrations were higher in the urban tributaries (19.9±5.8 n100L-1) than in the Pantanal lowlands (4.5±2.5 n100L-1). Fibers were always the most important fraction, followed by fragments. In the lowlands, pellets were scarce and XPS were absent. Comparison between microplastic composition in the floodplain and the urban areas suggest that pellets are transported from the urban area to the Pantanal, while microfibers and fragments could both be transported from the urban areas and have a local origin. These results indicate that microplastics are contaminating the Pantanal and its affluents and eventually can affect the local fauna. More research is needed to understand the extent and possible implications regarding the contamination by microplastics of the aquatic and terrestrial ecosystems of the Pantanal.

COVID-19 pandemic repercussions on plastic and antiviral polymeric textile causing pollution on beaches and coasts of South America

“…Río de la Plata, and Bahía Blanca estuaries (Acha et al, 2003;Pazos et al, 2017;Fernandez Severini et al, 2019;Forero et al, 2020), Paraná River (Blettler et al, 2017;, beaches of the Southwestern Atlantic, and coastal areas of Puerto Madryn city: (Becherucci et al, 2017;Ríos et al, 2020), in Argentina. Beaches of Punta del Este, and coast of Uruguay Atlantic, Uruguay (Lozoya et al, 2016;Rodríguez et al, 2020), and Pantanal wetlands, Paraguay (Faria et al, 2019).…”

Environmental Nanopollutants

“…32 With respect to plastic particles, the presence of microplastics in marine and freshwater systems is well documented. 33,34 For instance, microplastics have been found in the Southern Ocean, 35 South Atlantic Ocean, 36 Latin American marine and freshwaters, 37 the South American Pantanal, 38 the coastal surface waters around the subtropical island of Okinawa (Japan), 39 subtropical gyres, 40 the Western Mediterranean Sea, 41 the Sea of Marmara (Turkey), 42 the Yangtze Estuary System (China), 43 and in a continental environment such as the Greater Paris (France), 44 among others. However, the detection and quantification of nanoplastics is more challenging due to their small size.…”