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Bees and Microplastic Studies: A Systematic Review
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This systematic review of 33 studies found that microplastic research involving bees is still in its early stages, with evidence suggesting microplastics can alter bee gut microbiota and impair immune function. Given that compromised bee health threatens pollination services and broader ecosystem stability, the review calls for more primary studies on this understudied topic.
Microplastic contamination is no longer confined exclusively to aquatic environments and their organisms. Over the past 20 years, microplastics have increasingly been recognized as a source of contamination in terrestrial ecosystems and the organisms that inhabit them. Some studies have reported that these contaminants can alter the intestinal microbiota of bees, which may also harm their immune system and, consequently, directly impact the health of these animals. These consequences can impair bees' ability to effectively carry out their foraging activities, potentially leading to the decline of the hive and negatively impacting the ecosystem services they provide through pollination. However, research linking microplastics to bees is still in its early stages. Therefore, this work conducted a systematic review, applying selection and exclusion criteria to studies published between 2000 and 2024 that mentioned bees or bee products in relation to microplastics. These publications were extracted from electronic databases (Google Scholar, Scielo, Scopus, PubMed, and Web of Science). With the keywords used, 920 works were found, of which 33 met the pre-established review criteria, produced between 2013 and 2024, most of them from Italy (six studies) and China (five studies). Among the 33 studies selected, twelve are bibliographic reviews, indicating the need for further primary studies related to the subject, since bees provide vital ecosystem services through pollination.
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This review summarizes existing research on microplastics in honey bees, found in honey, beeswax, pollen and nectar. Lab studies show microplastics can cause gut damage, stress and possible memory and learning problems in bees, but effects on whole colonies, pollination and human health remain unproven.
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Honeybees orally exposed to polystyrene micro- and nanoplastics showed disrupted gut microbiota and impaired intestinal immune function, with nanoplastics causing greater effects than microplastics. Since honeybees are critical pollinators for food production, microplastic contamination in their environment could affect both bee health and agricultural systems.
Beyond Mammalian Models: Honeybees as Sentinels for Microplastic-Driven Gut Dysbiosis and Reproductive Dysfunction
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This review paper examines existing research on honeybees as a model for studying how microplastics affect gut bacteria and reproduction. It argues that honeybees, which encounter microplastics while foraging, could help scientists understand links between gut health and reproductive problems, a connection studied in mammals but not yet tested in pollinators.
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This review examines whether microplastics pose a risk to honey bee populations, noting that microplastics have been detected in honey samples and on bees collected from both urban and rural areas. Researchers found that exposure to certain polymer types may affect bee health, and the study calls for more research to understand the risks of microplastic exposure to pollinators and the broader implications for ecosystem health.
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