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The growth responses of Eisenia fetida (Savigny 1826) exposed to microplastics
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This Turkish study examined the effects of microplastics on growth parameters of the earthworm Eisenia fetida in laboratory conditions. Researchers found that microplastic exposure affected earthworm growth rates, raising concerns about soil ecosystem health given earthworms' critical role in soil function.
Dünya üzerinde plastik kullanımının artması ile birlikte zamanla aşınarak mikroplastik adı verilen daha küçük partiküller doğal ortamlarda artış göstermektedir. Mikroplastikler canlılar tarafından istemsizce tüketilebilirboyutlarda olmaları sebebiyle tehdit oluşturmaktadırlar. Bu çalışmada mikroplastiğin toprak solucanlarının (Eisenia fetida) büyüme parametrelerine etkileri araştırılmıştır. Bu çerçevede solucanların diyetine günlük toplam besin gereksinimlerinin %25’i oranında 1mm’den küçük mikroplastik parçacıklar katılmıştır. Bir grup solucan polistiren (PS) ortamına bırakılmıştır. Deneylerde iki farklı mikroplastik, plastik boya pigmenti (PBP) ve polimetilmetakrilat (PMMA) kullanılmış ve toprak solucanlarının büyüme parametreleri üzerine etkilerigözlenmiştir. Toprak solucanlarının PBP, PMMA ve PS uygulamalarında 21. ve 42., PBP tekrar uygulamasında 42. ve 84. günlerindeki boy ve ağırlıkları ölçülmüştür. Uygulama öncesinde E. fetida bireyleri çay ve semizotu ortamında 30 gün boyunca beslenmiş, boy ve ağırlıklarında artış gözlenmiştir. PBP, PBP tekrar, PMMA ve PS uygulamalarında süreçte solucanların ağırlığına bir azalma gözlenmiştir.
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Effects of Polyethylene Microplastics in Agricultural Soil on Eisenia fetida (Annelida: Oligochaeta) Behavior, Biomass, and Mortality
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Scientists tested how polyethylene microplastics in agricultural soil affected the behavior, body mass, and survival of the earthworm Eisenia fetida. Researchers found that earthworms actively avoided soil contaminated with microplastics and experienced changes in biomass at higher concentrations. The study suggests that microplastic pollution in farmland could negatively affect soil-dwelling organisms that play a key role in maintaining soil health.
Effects of polyethylene microplastics stress on soil physicochemical properties mediated by earthworm Eisenia fetida
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Researchers exposed earthworms to polyethylene microplastics of two sizes and found that smaller particles (13 micrometers) were more toxic than larger ones (130 micrometers), reducing survival and growth more severely. The microplastics caused oxidative stress in the worms and altered key soil properties including pH and organic carbon content. Since earthworms play a vital role in maintaining healthy soil for agriculture, this damage could affect soil quality and ultimately the food grown in microplastic-contaminated farmland.
Effect of Microplastic Exposure on Earthworms Eisenia Fetida and Eudrilus Eugeniae
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Scientists exposed earthworms to microplastics (tiny plastic particles) and found they lost weight, reproduced less, and suffered damage to their skin and muscles. While this study looked at soil health rather than humans directly, it matters because earthworms are essential for healthy soil that grows our food—and it adds to growing evidence that microplastics, which are now found throughout our environment and food chain, can harm living organisms at a biological level.
The effects of polyethylene microplastics on the growth, reproduction, metabolic enzymes, and metabolomics of earthworms Eisenia fetida
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This study exposed earthworms to polyethylene microplastics in soil for 60 days and found that even when the worms appeared physically healthy, their internal enzyme systems and metabolism were significantly disrupted. The damage included signs of neurotoxicity, oxidative stress, and reduced ability to break down harmful substances. Since earthworms are essential for soil health and crop growth, this disruption could indirectly affect the quality of food humans eat.
Ecotoxicological Effects of Commercial Microplastics on Earthworm Eisenia fetida (Savigny, 1826) (Clitellata; Lumbricidae)
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Researchers exposed earthworms to different concentrations of commercial glitter, a common source of primary microplastics, and found that higher concentrations increased death rates and reduced reproduction. The earthworms did not avoid microplastic-contaminated soil, meaning they continued to ingest the particles, which accumulated throughout their digestive systems. Since earthworms are a key part of soil food webs, microplastic buildup in their bodies could transfer plastic particles to birds, fish, and other animals higher up the food chain.
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