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Unravelling the microplastic menace: Different polymers additively increase bee vulnerability
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Researchers exposed bees to two common types of microplastics, both individually and combined, and found that the mixture caused additive harmful effects on survival and behavior. The microplastics impaired the bees' ability to learn and remember, which is critical for finding food and navigating. Since bees are essential pollinators for food crops, microplastic pollution threatening bee health could have indirect consequences for human food production.
Microplastics (MPs) are growing and ubiquitous environmental pollutants and represent one of the greatest contemporary challenges caused by human activities. Current research has predominantly examined the singular toxicological effects of individual polymers, neglecting the prevailing reality of organisms confronted with complex contaminant mixtures and potential synergistic effects. To fill this research gap, we investigated the lethal and sublethal effects of two common MPs, polystyrene (PS - 4.8-5.8 μm) and poly(methyl methacrylate) (PMMA - 1-40 μm), and their combination (MIX), on the pollinating insect Apis mellifera. For each treatment, we evaluated the oral toxicity of two ecologically relevant and one higher concentration (0.5, 5 and 50 mg/L) and analysed their effects on the immune system and worker survival. As immune activation can alter the cuticular hydrocarbon profile of honey bees, we used gas chromatography-mass spectrometry (GC-MS) to investigate whether MPs lead to changes in the chemical profile of foragers and behavioural assay to test whether such changes affect behavioural patterns of social recognition, undermining overall colony integrity. The results indicate an additive negative effect of PS and PMMA on bee survival and immune response, even at ecologically relevant concentrations. Furthermore, alterations in cuticle profiles were observed with both MPs at the highest and intermediate concentrations, with PMMA being mainly responsible. Both MPs exposure resulted in a reduction in the abundance of several cuticular compounds. Hive entry guards did not show increased inspection or aggressive behaviour towards exposed foragers, allowing them to enter the colony without being treated differently from uncontaminated foragers. These findings raise concerns not only for the health of individual bees, but also for the entire colony, which could be at risk if contaminated nestmates enter the colony undetected, allowing MPs to spread throughout the hive.
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Unravelling the microplastic menace: different polymers work in synergy to increase bee vulnerability
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Researchers studied the effects of polystyrene and poly(methyl methacrylate) microplastics, both individually and combined, on honeybees. They found that the mixture of different microplastic polymers produced synergistic harmful effects that were worse than either polymer alone, including increased mortality and disrupted gut microbiota. The study highlights that real-world microplastic exposure, which typically involves mixtures of polymers, may pose greater risks to pollinators than single-polymer laboratory studies suggest.
Microplastics reach the brain and interfere with honey bee cognition
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Researchers found that microplastics reach honey bee brains and impair cognitive function, with bees exposed to mixed polymer combinations showing disrupted learning and memory abilities, demonstrating that plastic pollution poses a direct threat to pollinator health.
Negative effects of increased ozone concentrations and heat stress on bumblebees are exacerbated by microplastics
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This study found that microplastic exposure worsened the negative effects of heat stress and increased ozone levels on bumblebees. When bees were exposed to multiple stressors at once, including microplastics, the combined harm was greater than any single stressor alone. This matters because bees pollinate many of the crops humans eat, and their decline could affect food security.
Effects of different microplastic types and co-exposure on the survival of Apis mellifera ligustica (Spinola, 1806) and its associated microbial communities
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Researchers fed honey bees three types of microplastics (polystyrene, polyethylene, and polymethyl methacrylate) individually and in combination, and found that all treatments significantly reduced bee survival compared to controls. The combination of all three microplastic types had the strongest negative effect, and the gut microbial community showed time- and treatment-specific shifts that may represent an initial compensatory response to maintain functional stability.
Species-specific effects of microplastic-contaminated pollen on larval development in two wild bee species (Apidae, Megachilidae; Apiformes)
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Scientists found that tiny plastic bits on pollen can mess with how baby bees grow, but surprisingly, low doses caused more harm than high doses in some cases, which is unusual and not fully understood yet. This matters because bees pollinate much of our food supply, so if microplastic pollution (which is now everywhere in air, soil, and water) is quietly harming bee populations, it could eventually affect the fruits, vegetables, and crops we depend on.
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