RESUMEN

This study is a baseline data on the presence of MPs from the gastro-intestinal tracts (GITs) in Coryphaena hippurus Linnaeus, from eastern Baja California Sur, México. 878 MPs items (in %) of fibers (29%), fragments (68%) and films (1.3%) were detected from 51 GITs of Coryphaena hippurus. Transparent, white, blue and black were the prevalent colours. Morphological features observed through SEM analysis, the presence of heavily weathered MPs is due to the mechanical, microbiological and chemical weathering process. PP (29%), Nylon (29%), PS (17%), PE (11%), PET (6%) and HDPE (8%) presence indicates their source from regional anthropogenic stress. Trophic level transition is enforced by polymer derivative, permitting the sinking behavior of MPs and increased ingestion probability. Fishes were classified as slim despite their higher feeding capabilities and ingested MPs indicates a relationship with environmental contaminants. Current study emphasizes the health risk linked to biological aspects of MPs ingestion.

Asunto(s)

Perciformes , Contaminantes Químicos del Agua , Animales , Microplásticos , Plásticos/análisis , México , Contaminantes Químicos del Agua/toxicidad , Contaminantes Químicos del Agua/análisis , Peces , Monitoreo del Ambiente

RESUMEN

This study focuses on the presence of MPs in the sediment beds around coral reefs of MPNPs in Baja California Sur, México. Based on seasonal sampling results, comparison of MPs from Cabo Pulmo (avg. 680.25 items/100 g-1 d.w) recorded higher values than Espiritu Santo Island (avg. 321.75 items/100 g-1 d.w) from backshore/foreshore regions. Fibrous MPs are the dominant morphotypes followed by fragments and spheres. SEM/EDS analysis revealed that the MPs are altered texturally in surface and is bioavailable to marine organisms independent of size/shape. FTIR analysis indicate different polymers (in %) in the form of PP (70), PET (65), HDPE (59), LDPE (50), PS (30), PC (18), PU (10) and RYN (10). Most of the MPs are secondary in origin resulting from man-made and tourist's activities controlled by wave transportation and tidal currents. Existence of MPs in sediment beds around the coral reefs signals the ways for future investigations.

Asunto(s)

Microplásticos , Contaminantes Químicos del Agua , Arrecifes de Coral , Monitoreo del Ambiente , Humanos , México , Parques Recreativos , Plásticos , Estaciones del Año , Contaminantes Químicos del Agua/análisis

RESUMEN

Investigation on freshwater MPs has increased gradually across the world, since they are main trajectory for the transportation of MPs from inland to ocean. The present study aims to identify the presence, distribution and the type of MPs in the lake Hawassa, Ethiopia. Twenty-five shoreline surface sediments were separated using ZnCl2 solution and was microphotographed using SEM and type of MP was identified using FTIR spectra. The abundance of MPs was in range of 11-74 items/m3 near the catchment area of the lake in the eastern side. Fiber (90%), fragments (5%) and pellets (5%) were the commonly observed form with varied colour such as white, black, blue, red and others. Our results infer that the common polymer detected in the study area were polyester (82%), polyethylene (15%) and polystyrene (3%) infer their origin from fishing nets, ropes and plastics bags. The industries near the lake contributes more MPs, where the waste water effluents are drained directly into the lake. Spearman's correlation matrix applied among the MPs characters endorses the fate of MPs in the lake environment indicating the weathering process (especially due to bleaching process). Comparative studies with other lake regions around the globe indicate higher values which is entirely and it depends on various factors surrounding the study area. Being, highly polluted lake in Ethiopia, this study extremely acclaims that some monitoring studies in fresh water components in the lake Hawassa helps to mitigate the prevailing MPs pollution.

Asunto(s)

Microplásticos , Contaminantes Químicos del Agua , Monitoreo del Ambiente/métodos , Etiopía , Sedimentos Geológicos , Lagos , Plásticos , Aguas Residuales , Contaminantes Químicos del Agua/análisis

RESUMEN

Microplastics (MPs) existence, identification and source were investigated by studying a total of 2539 particles in 349 sediment samples from nine different tourist beaches [(Sodwana & Richard Bays; Ballito, Mtunzini, Tugela, Zinkwazi, Ballito (north & south) and Durban north & south)] of southeastern coast of South Africa. They are more abundant in the beaches of the Durban city, followed by the Sodwana & Richards Bays, Ballito and Mtunzini. The black particles prevailed over the blue, white, pink, brown, red and green MPs. Supremacy of MPs in the Durban city is mainly due to the longshore coastal Agulhas current in the South eastern side of African coast aiding the degradation of primary plastics coming both from continent and sea. SEM images provided the evidences of weathering/degrading process through grooves, cracks, deep fissures, sharp edges and layered degradation showing signs of oxidation due to long term exposure in the coastal environment. EDS results suggested presence of elements (i.e. C, -O, Si, Al, Fe, Ca, Mg, Na, K, S, Ti, Cu and Zn introduced during the production of plastics as additives. FTIR spectral matches identified from all samples infer polypropylene (PP) (62%), rayon (RY) (17.2%), polycarbonate (PC) (29.8%), nylon (NY) (18.92%), polyester (PES) (31.2%), polyacrylonitrile (PAN) (11.21%) and polystyrene (PS) as well as low (28.9%) & high (36.1%) polyethylene terephthalate (PET). Higher abundance of MPs in the beaches of South Africa in comparison with studies around the world emphasizes the need of dispersal monitoring and use of plastic materials/polymers.