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Microplastics Occurrence in the European Common Frog (Rana temporaria) from Cottian Alps (Northwest Italy)

Diversity 2022 54 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 45 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

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Summary

Adult European common frogs (Rana temporaria) from high-mountain sites in the Cottian Alps of northwest Italy were found to contain plastic particles in their gastrointestinal tracts, representing one of the first records of microplastic ingestion in this species from an alpine ecosystem. The study demonstrates that plastic contamination has penetrated even remote mountain amphibian populations far from direct human plastic sources.

Polymers

PA PE PET

Body Systems

Digestive

Study Type Environmental

Microplastics (MPs) pollution is arousing growing attention, yet knowledge about its occurrence in amphibians is scant to date. With this study, we aimed to determine whether plastic (>5000 μm) and MPs (10–5000 μm) could be detected in adult Rana temporaria from a high-mountain ecosystem (the Cottian Alps, northwest Italy). To do this, aquatic compartments and the digestive tract of adult R. temporaria were analyzed. Water, sediment, periphyton, aquatic macroinvertebrates, and tadpoles tested negative for plastic and MPs. Microplastics were detected in all the adult frogs (n = 5); all the identified items (one per specimen) were fibers (size range: 550.91–2355.51 µm). A statistically significant positive correlation between the particle length and frog size was recorded. The predominant fiber color was blue. The chemical composition was polyamide (60%), polyethylene (20%), and polyethylene terephthalate (20%). Since both the biotic and the abiotic freshwater compartments (tadpoles included) revealed the absence of MPs, it can be assumed that adult frogs ingest MPs from the surrounding terrestrial environment.

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