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Uptake, growth, and oxidative stress responses of Rhizophora mucronata (Poir. in Lam.) propagules exposed to high-density polyethylene microplastics
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Researchers exposed mangrove propagules to environmentally relevant concentrations of high-density polyethylene microplastics for three months and found that the particles accumulated on root surfaces and translocated into the shoot system. The microplastics caused significant reductions in root length, plant height, and foliar area, along with increased oxidative stress indicators. The study suggests that microplastic pollution poses a real threat to mangrove growth and could ultimately affect the diversity and productivity of mangrove forests.
The plastic revolution's contribution to global pollution gives rise to microplastics (MPs), bearing a toll on the marine environment. Knowledge of mangrove exposure to MPs causing adverse effects has yet to be elucidated. Hence, the physiological responses of R. mucronata propagules exposed to ubiquitous High-Density Polyethylene Microplastics (HDPE-MPs) were investigated. The set-up consists of a control (0 mg/L) and an environmentally relevant treatment group (32.65 mg/L), acclimatized and exposed for three months. Scanning Electron Microscopy (SEM) shows agglomeration of HDPE-MPs on root surfaces and translocation to the shoot system of smaller MPs (< 50 μm). Attenuated Total Reflectance Fourier Transform-Infrared Spectroscopy (ATR FT-IR) confirmed uptake in the roots. Root length, count, plant height, foliar area, and oxidative stress biomarkers (carbonyl protein and total chlorophyll) all show significant differences (p < 0.05). Indeed, plastic pollution has detrimental effects on mangroves that may consequently affect mangrove forest diversity and productivity.
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Scientists found that tiny plastic particles in soil drastically reduced the survival of mangrove tree seedlings, with only 20% surviving in heavily polluted conditions compared to 80% in clean soil. This matters because mangrove forests act as natural barriers that protect coastal communities from storms and flooding, while also filtering pollution from water before it reaches the ocean. As microplastics continue to accumulate in our environment, they could damage these crucial ecosystems that help keep our coastlines and water supplies healthy.
The Effects of Polyethylene Microplastic Accumulation on Rhizophora mucronata Seedling Survival in the Mangrove Ecosystem of South Jakarta
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Scientists found that tiny plastic particles in soil dramatically reduce the survival of young mangrove trees, with survival rates dropping from 80% in clean soil to just 20% in heavily polluted soil. This matters because mangrove forests protect coastlines from storms and flooding while filtering water that eventually reaches humans. As plastic pollution increases in coastal areas, we could lose these natural barriers that help protect communities and clean our environment.
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