We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Multigenerational testing reveals delayed chronic toxicity of bisphenol A to Daphnia magna: A common characteristic of endocrine-disrupting chemicals?
AI summary Read the abstract
Scientists exposed tiny water fleas to low levels of BPA (a chemical found in many plastics) across six generations and found something unexpected: the harm didn't show up until the sixth generation, when the fleas showed delayed growth, reproductive problems, and smaller body size. This suggests that some effects of hormone-disrupting chemicals like BPA can build up quietly over generations before becoming visible, a warning sign that short-term safety tests on plastic chemicals may miss risks that only emerge years or generations later, a concern that could extend to long-term human exposure as well.
Bisphenol A (BPA) poses longstanding environmental concerns due to its widespread presence and recognized toxicity; however, its multigenerational ecotoxicity, in aquatic models such as water fleas, remains incompletely understood. This study examined the impact of sublethal BPA exposure on Daphnia magna across six generations, tracking changes in both life-history and population traits. Over the first five generations, BPA exposure produced minor and inconsistent effects on age at first oogenesis, age at first offspring production, growth rate, and fertility. The sixth generation exhibited prolonged oogenesis, delayed first offspring production, reduced body size, and decreased fertility, indicating delayed adverse effects. These multigenerational effects did not significantly alter population size or dynamics. Furthermore, BPA exposure did not affect feeding behavior in D. magna over six days, suggesting that food consumption-mediated mechanisms were unlikely a contributing factor. Our findings reveal BPA's delayed adverse effects on D. magna fitness, underscoring potential vulnerabilities for D. magna and other species under additional environmental stressors. These results support literature indicating that endocrine-disrupting chemicals can cause delayed and cumulative adverse effects on zooplankton descendants. Broadening multigenerational research to include a wider range of species, alongside sub-organismal analyses, is crucial to advancing regulatory frameworks and understanding underlying mechanisms.
More Papers Like This
Thresholds and interactive effects of BPA-gradient and temperature on life history traits of Daphnia magna
AI summary Read the abstract
Researchers studied how bisphenol A (BPA), a chemical used in plastic production, affects water fleas at different temperatures. BPA was more toxic when transferred through the food chain rather than just present in water, and its effects changed depending on temperature conditions. This study shows that climate change could make plastic-related chemical pollution more dangerous for aquatic organisms, with potential ripple effects up the food chain toward human food sources.
Effects of nanoplastics at predicted environmental concentration on Daphnia pulex after exposure through multiple generations
AI summary Read the abstract
Researchers exposed water fleas (Daphnia pulex) to environmentally realistic nanoplastic concentrations across three generations over 63 days. They found that while the first two generations showed mainly molecular-level stress responses, the third generation experienced reduced growth and reproduction along with suppressed antioxidant defenses. The study suggests that even very low nanoplastic concentrations can have significant long-term toxic effects that worsen across generations and may take multiple generations to recover from.
Transgenerational effects of polyethylene microplastic fragments containing benzophenone-3 additive in Daphnia magna
AI summary Read the abstract
Researchers investigated the transgenerational effects of polyethylene microplastic fragments containing the UV filter benzophenone-3 on water fleas (Daphnia magna) across four generations. They found that while mortality effects recovered by the third unexposed generation, reproductive impairments persisted, with the additive BP-3 contributing more to long-term toxicity than the plastic particles alone. The study suggests that chemical additives in microplastics may pose lasting risks to aquatic organisms even across generations that were never directly exposed.
Life-stage dependent responses to microplastics and 2-methoxy-1,4-naphthoquinone in Daphnia magna
AI summary Read the abstract
Scientists studying tiny water fleas found that microplastics and a chemical released by an invasive plant (Himalayan balsam) each harm growth and reproduction differently depending on when exposure happens—microplastics hurt young organisms first, while the plant chemical's damage builds up and becomes more harmful later in life, especially when combined with microplastics. This matters because it shows pollution effects aren't simple or constant over time, meaning our current safety testing (which often looks at short snapshots) might miss how combined, everyday pollutants slowly harm aquatic ecosystems—and understanding these interactions helps us better assess
Evaluating sublethal effects of long-term exposure of Daphnia magna to nanoplastics at a low concentration
AI summary Read the abstract
Lab experiments exposed Daphnia magna — a water flea that links primary producers to larger predators — to nanoplastics at low concentrations over multiple generations. The nanoplastics caused sublethal reproductive effects that became more pronounced over successive generations, suggesting that long-term, low-level nanoplastic exposure in the environment could gradually impair aquatic invertebrate population health.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.