We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Ecotoxicological consequences of polystyrene naturally leached in pure, fresh, and saltwater: lethal and nonlethal toxicological responses in Daphnia magna and Artemia salina
AI summary Read the abstract
Researchers tested the toxic effects of chemicals that naturally leach out of polystyrene plastic in both freshwater and saltwater on two small aquatic organisms. They found that the leachates caused both lethal and sublethal effects, including reduced reproduction and mobility, with toxicity varying depending on water salinity. The study highlights that the chemicals released by degrading plastics may pose risks to aquatic life even when the plastic particles themselves are not directly ingested.
Polystyrene is widely used in disposable products and is now a ubiquitous plastic pollutant in aquatic environments, where it degrades into smaller particles that leach potentially toxic chemicals. However, knowledge regarding the impacts of plastic leachates remains limited. This study investigates the lethal and nonlethal effects of polystyrene leachate on two ecologically significant aquatic organisms, Daphnia magna (water flea) and Artemia salina (brine shrimp). Polystyrene leachates were prepared in seawater, freshwater, and sterile, pure water by incubating the material in each of the media under natural conditions for six months. D. magna and A. salina were exposed to varying concentrations of the leachates under controlled laboratory conditions, monitoring their survival, as well as measuring reactive oxygen species and antioxidant responses as superoxide dismutase and catalase activity. The data show that A. salina was more significantly affected with higher mortality observed at lower leachate concentrations, potentially linked to seawater enhancing the leaching of toxic additives. Moreover, at non-lethal concentrations, the antioxidative responses maintained homeostasis in both organisms. Considering the current reported microplastic concentrations in the aquatics and the adequate antioxidative response, leachate from plastic potentially does not pose a severe threat to these organisms. Nevertheless, hydrological characteristics of waterbodies may cause microplastic hotspots, which could significantly concentrate plastics and thus their leachates, necessitating action to reduce the current microplastic pollution level and avoid future surges. This study highlights the ecological significance of polystyrene pollution, emphasizing the need for more comprehensive regulatory measures and the development of sustainable alternatives to polystyrene-based products. The distinct responses of D. magna and A. salina imply that the impact of plastic pollution varies among species, necessitating further research to elucidate broader ecological consequences. Understanding how polystyrene leachate affects keystone species provides crucial insights into the overall implications for aquatic ecosystems.
More Papers Like This
Understanding plasticiser leaching from polystyrene microplastics
AI summary Read the abstract
Researchers studied how plasticiser chemicals leach out of polystyrene microplastics into surrounding water, testing both phthalate and bisphenol additives. They found that leaching rates depended on the chemical type, water temperature, and salinity, with some plasticisers releasing more readily in saltwater conditions. The findings help explain how microplastics serve as a source of potentially harmful chemical additives in ocean and freshwater environments.
Abundance and characteristics of microplastics in market bivalves from South Korea
AI summary Read the abstract
Researchers investigated the effects of polystyrene microplastics on the freshwater cladoceran Daphnia magna, a key species in aquatic food webs. They found that microplastic exposure impaired reproduction, reduced growth, and caused oxidative stress even at relatively low concentrations. The study highlights that these tiny plastic particles can harm small freshwater organisms that play a critical role in maintaining healthy aquatic ecosystems.
Leachate From Expanded Polystyrene Cups Is Toxic to Aquatic Invertebrates (Ceriodaphnia dubia)
AI summary Read the abstract
Leachate from expanded polystyrene cups was found to be acutely toxic to the freshwater invertebrate Ceriodaphnia dubia at concentrations lower than the styrenics content alone would predict, suggesting that other chemical additives contribute to toxicity. The findings support proposed bans on single-use expanded polystyrene products and highlight that plastic leachate toxicity extends beyond the primary polymer.
Toxic impact of polystyrene microplastic particles in freshwater organisms
AI summary Read the abstract
Researchers tested the toxic effects of polystyrene microplastics on four freshwater species including algae, rotifers, crustaceans, and ostracods. They found that water fleas were the most sensitive, with chronic effects appearing at very low concentrations, and that microplastics caused both DNA damage and increased production of reactive oxygen species. The study highlights that even at relatively low concentrations, microplastics can pose a meaningful threat to freshwater ecosystems.
Combined effects of salinity and polystyrene microplastics exposure on the Pacific oysters Crassostrea gigas: Oxidative stress and energy metabolism
AI summary Read the abstract
Researchers studied how salinity levels affect the toxicity of polystyrene microplastics in Pacific oysters and found that low salinity reduced microplastic uptake but created complex interactions with oxidative stress and energy metabolism. Smaller microplastics generally caused more biological disruption than larger ones across all salinity conditions. This is important because coastal oyster habitats frequently experience salinity changes, and the findings suggest environmental conditions can alter how harmful microplastics are to shellfish.
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.