For the first time, scientists have found microplastics inside tadpoles living in the Amazon. The discovery came from a study conducted in the Brazilian state of Pará, where researchers collected tadpoles from streams and ponds in both protected areas and areas near human settlements. The finding confirms that plastic pollution has reached even the most biodiverse and seemingly pristine ecosystems on Earth.
Tadpoles in protected areas also carried plastic
The study examined tadpoles from 16 different sites across the Amazon basin. Researchers found microplastic particles in the digestive tracts of tadpoles from every single location, including those inside protected reserves. The particles included fragments of fibers, films, and spheres, with the most common types being polyamide, polyethylene, and polypropylene. These materials are commonly used in clothing, packaging, and fishing gear.
How plastic reaches remote Amazon waterways
Local people in the region depend on these same streams and rivers for drinking water, fishing, and bathing. The presence of microplastics in tadpoles suggests that the entire aquatic food web may be contaminated. Tadpoles are filter feeders, meaning they strain particles from the water as they eat. This makes them especially vulnerable to ingesting tiny plastic debris. The study was led by researchers from the Federal University of Pará and the Emílio Goeldi Museum in Belém.
A warning signal for the Amazon's web of life
The researchers collected tadpoles from six frog species, all of which contained microplastics. The study did not examine whether the plastics caused physical harm to the tadpoles, but it noted that ingestion can lead to blocked digestive tracts, reduced growth, and altered behavior in other aquatic animals. Because tadpoles are prey for fish, birds, and insects, the plastics they carry can move up the food chain. The study adds the Amazon to a growing list of ecosystems worldwide where microplastics have been detected in freshwater wildlife.
