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Tracing microplastics in environmental sources and migratory shorebirds along the Central Asian Flyway
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Researchers tracked microplastic contamination along migratory bird routes in central Asia, testing mudflats, mangroves, and the birds themselves. They found microplastics in both the environment and the digestive tracts of shorebirds, showing that these pollutants are moving through coastal food webs and may be carried across continents by migrating birds.
Microplastic pollution poses a significant threat to coastal ecosystems worldwide. Despite its widespread occurrence, knowledge on the prevalence and fate of microplastics across food webs is limited. To bridge this gap, we conducted an extensive study on microplastic contamination in mudflats, mangroves, and sand beaches being key habitats for wintering shorebirds on the west coast of India. Using a comprehensive multi-matrix approach covering water, sediment, biofilm, plankton, benthic macroinvertebrates, and migratory shorebird droppings, we analysed microplastic contamination across ten coastal sites from 2020 to 2022. Our findings show spatial and temporal variations in microplastics widespread in water and sediments, influenced by human activities. Notably, an increase in microplastics within prey and shorebird droppings coincide with a decline in prey abundance and shorebird populations. The prevalence of fibre-shaped microplastics indicates that common sources include discarded fishing gear and domestic sewage. The types of microplastics ingested by shorebirds varied depending on their feeding strategies, with biofilms serving as significant reservoirs of microplastics, facilitating their transfer to shorebirds. Epibenthic feeders, with a more limited foraging range, displayed the lowest levels of microplastics, while species foraging through multiple sediment layers exhibited higher concentrations. These findings underscore the urgent need for stricter conservation measures to tackle plastic pollution at its source. The study raises concerns about the potential harmful effects of microplastic contamination on the population of migratory shorebirds along the west coast of India. Continued research is crucial to understand the ecological impacts of microplastics on wintering shorebirds and to develop effective conservation strategies.
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The threat of microplastics: Exploring pollution in coastal ecosystems and migratory shorebirds along the west coast of India
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Researchers surveyed microplastic contamination across ten coastal sites on India's west coast, testing water, sediment, invertebrate prey, and shorebird droppings. Microplastics, mostly fibers, were found in all sample types, with water identified as the primary pathway for spreading plastics through the food chain. The study demonstrates how microplastics move from water through prey animals to top predators, illustrating the food chain transfer that ultimately could affect human seafood consumption.
[Pollution Characteristics of Microplastics in Migratory Bird Habitats Located Within Poyang Lake Wetlands].
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Researchers found microplastics in surface water, sediment, and the droppings of migratory birds at a Chinese wetland lake, raising concerns about how birds can transport microplastics across long distances. The study suggests that migratory birds may be spreading plastic contamination between distant habitats.
Microplastic Ingestion and Diet Analysis in Migratory Shorebirds at Bahía Lomas Ramsar Site, Chile.
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Scientists found tiny plastic fibers (microplastics) in the sediment, food, and droppings of migratory shorebirds in a remote, protected wetland in Chile — showing that plastic pollution has reached even far-off, seemingly pristine habitats. This matters because these birds are part of the same food chains and coastal ecosystems that eventually connect to the seafood many people eat, suggesting microplastic contamination is becoming nearly impossible to avoid, even in nature's most protected corners.
Effects of microplastics on energy accumulation in a migratory shorebird in the coastal wetlands of the Yellow Sea, China
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Researchers studied how microplastic ingestion affects the energy reserves of migratory shorebirds in China's Yellow Sea coastal wetlands. They found that birds with higher microplastic levels in their digestive tracts had reduced fat and muscle stores, which are critical for long-distance migration. The study suggests that microplastic pollution could impair the ability of migratory birds to complete their journeys, posing a broader threat to shorebird conservation.
Shorebird droppings analysis: Microplastics and heavy metals in a key conservation reserve and adjoining sand beaches in the west coast of India
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Researchers analyzed droppings from ten migratory shorebird species at a conservation reserve on India's west coast and found microplastics and heavy metals in samples from all species. The contamination levels varied by species and season, reflecting differences in diet and habitat use. Since shorebirds are top predators in coastal food webs, their contamination indicates widespread microplastic and heavy metal pollution throughout the coastal ecosystem.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.