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Ingestion, egestion and physiological effects of polystyrene microplastics on the marine jellyfish Rhopilema esculentum
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Researchers investigated how the edible jellyfish Rhopilema esculentum ingests and ejects polystyrene microbeads, finding relatively low ingestion rates but chronic physiological effects at both environmental and predicted microplastic concentrations.
Jellyfish are planktonic predators that may be susceptible to ingesting microplastics. However, the effects of MP exposure on jellyfish are poorly understood. In this study, the ingestion and egestion of polystyrene microbeads, and its chronic physiological effects on Rhopilema esculentum at an environmental concentration (100 items/L) and a predicted concentration (1000 items/L) were evaluated. The results showed that the ingestion amount of juvenile medusae was relatively low. The MP egestion rates reached 100 % within 9 h of clearance. Chronic exposure (15 days) to MPs at environmental concentrations led to no adverse impacts. Nevertheless, the predicted concentration of MP exposure induced growth inhibition, a reduction in assimilation efficiency, oxygen consumption increase, and lipase enzyme activity reduction in the jellyfish, indicating that MPs can cause adverse effects on the energy budget of jellyfish in the near future. Our study provides new insights into the potential risk of MPs in marine environments.
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Researchers found that jellyfish ephyrae ingested 35 times more microbeads through trophic transfer from Artemia nauplii than by direct ingestion, and that aged microbeads were ingested at higher rates than virgin microbeads, highlighting the importance of realistic aging conditions in microplastic experiments.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.