We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
0659 - The stressful effects of microplastics associated with chromium (VI) on the microbiota of Daphnia magna
Summary
This conference abstract examined how microplastics combined with chromium(VI) affected the gut microbiota of Daphnia magna, testing whether industrial effluents that combine microplastics with heavy metals cause compounding stress. Combined pollutant effects on organisms are an important area of microplastic research.
Contamination by microplastics (particles < 1 mm) is a growing and alarming environmental problem in freshwater systems.Evidence suggests that industrial effluents could be one of the critical point sources of microplastics and other pollutants, and their interaction can cause organismal stress and affect host and environmental microbial communities.We tested the individual and combined effects of microplastics and other pollutants on host survival and host associated (commensal) bacterial diversity.We exposed Daphnia magna to 1 µm microplastic beads with a concentration of approximately 1820 particles/ml and chromium (VI) simultaneously with treatments of 2 and 5 ppm for 72 h.DNA extraction was done to amplify and sequence the ribosomal Bacterial 16S from both the water and the Daphnia.Daphnia experienced low mortality in treatments microplastics (13.3%) and 2 ppm chromium VI (30%) individually.However, the combination of microplastics and 2 ppm chromium (VI) increased the mortality to 74.4%.In the treatments with 5 ppm of chromium (VI) mortality rose to 100% after 30 h of exposure.Microbial diversity changed in response to microplastics, chromium (VI), and both combined exposure.Microplastics and toxic metals can cause dysbiosis of freshwater environmental microbiota, whole host microbiota, and host survival.This work stresses the importance to assess how pollutants' individual and joint effects could affect organisms including their microbiome.
Sign in to start a discussion.
More Papers Like This
The Stressful Effects of Microplastics Associated With Chromium (VI) on the Microbiota of Daphnia Magna
Researchers exposed Daphnia magna to microplastic beads and chromium (VI) individually and in combination, finding that combined exposure increased mortality to 74% compared to 13% for microplastics alone and 30% for low-dose chromium alone. Microbial diversity in both the host and surrounding water was altered by individual and combined exposures, demonstrating microplastic and heavy metal interactions affect both host survival and microbiome health.
Short- and long-term single and combined effects of microplastics and chromium on the freshwater water flea Daphnia magna
Researchers investigated the individual and combined effects of microplastics and chromium on the water flea Daphnia magna in both short- and long-term experiments. They found that microplastics interacted with chromium, reducing its concentration in water, and that co-exposure caused acute toxicity but lacked the chronic effects seen with chromium alone. The study suggests that microplastics may alter the bioavailability and toxicity of metal pollutants in freshwater environments.
Multi stress system: Microplastics in freshwater and their effects on host microbiota
This study examined how combined exposure to microplastics and organic chemical pollutants affects freshwater organisms through a multi-stress approach, focusing on gut microbiome changes as an indicator. Microplastic exposure in combination with other pollutants altered microbiome composition more than either stressor alone, with potential consequences for host fitness and disease resistance.
Stressful Effects of Individual and Combined Exposure to Low-Concentration Polylactic Acid Microplastics and Chromium on Marine Medaka Larvae (Oryzias melastigma)
Researchers exposed marine medaka fish larvae to low concentrations of biodegradable polylactic acid microplastics and chromium, both individually and together, for 14 days. The combined exposure caused more severe intestinal damage, oxidative stress, and disruption of gut bacteria than either pollutant alone. The study suggests that even biodegradable microplastics can worsen the effects of heavy metal pollution on young fish in marine environments.
Combined Effects of Polystyrene Nanoplastics and Enrofloxacin on the Life Histories and Gut Microbiota of Daphnia magna
Researchers exposed Daphnia magna to polystyrene nanoplastics and the antibiotic enrofloxacin alone and in combination, measuring life history traits and gut microbiota responses. Both stressors individually reduced survival and reproduction, and combined exposure altered the taxonomic composition and metabolic function of gut microbiota more than either contaminant alone.