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Microplastics in guano of three Peruvian guano seabird species at Punta Coles, Humboldt Current System
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Microplastics in guano of three Peruvian guano seabird species at Punta Coles, Humboldt Current System
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Microplastics were found in the feces of 80.6% of samples from three Peruvian guano seabird species, with polyester (PET) fibers dominating at 58% of particles. The contamination of guano birds — whose droppings are an economically important fertilizer — signals how pervasive microplastic ingestion is in Humboldt Current marine food webs.
Seabird Transfer of Marine Microplastic Fibers to Terrestrial Soils Via the Accumulation of Guano at Palmyra Atoll, Northern Line Islands, Central Pacific Ocean
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Red-footed Boobies at Palmyra Atoll were found to transfer marine microplastic fibers to terrestrial soils through their guano, completing a two-vector ocean-to-land transport pathway. This documents a previously unrecognized mechanism by which seabirds act as biological vectors spreading marine microplastic contamination into remote island ecosystems far from human activity.
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A study of waterbird feces in southern Brazil found that shorebirds feeding in sediments had far higher microplastic loads than fish-eating birds, and contamination was worst near urban areas, with polyester and PVC the most common polymers detected. Trophic position and proximity to cities both shape how much plastic wildlife ingests, providing a natural monitoring system for tracking coastal microplastic pollution.
Microplastics impair seabird gut microbiomes
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A study of two seabird species found that microplastic ingestion significantly disrupts their gastrointestinal microbiomes, reducing microbial diversity and altering community composition in ways that may compromise immune function and digestion. These findings in wildlife mirror emerging concerns about microplastic effects on the human gut microbiome, where similar disruption could have broad implications for immune health and metabolic function.
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