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Daphnia magna digestive activity is differentially altered when exposed to equally turbid waters caused by either suspended sediment or suspended microplastics
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When tiny water fleas (Daphnia magna) were exposed to microplastics at the same concentration as natural sediment, they couldn't pass the plastic particles through their digestive systems as efficiently, reducing their feeding effectiveness. Unlike natural sediment, which the animals processed normally, microplastics disrupted gut motility in a way that suggests these filter feeders are poorly adapted to plastic pollution. This matters because Daphnia are a critical link in aquatic food chains, and impaired feeding could ripple up to fish and other predators.
Turbidity can be a result of suspended natural particles, such as sediment, or anthropogenic particles such as microplastics. This study assessed whether Daphnia magna, a pelagic filter feeder known to ingest suspended particles, have an altered response to equally turbid environments caused by the presence of either suspended bentonite or suspended polyethylene microplastics. Compared to controls, daphnids exposed to suspended bentonite maintained their feeding efficiency and increased their digestive activity, as measured by mandibular movement, peristalsis, and expulsion, to pass bentonite through the digestive tract. The same effects were not seen in microplastic-exposed individuals, in which feeding efficiency was decreased and only peristaltic movement was increased but without a coordinated increase in expulsion, suggesting that microplastics do not have the same ability as bentonite to pass through the digestive tract. This study highlights the need to discern the identities of particulates contributing to turbid environments as different particles, even of the same size, can have different effects on filter feeders, which inherently ingest suspended particles.
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Alterations in swimming behavior of Daphnia exposed to polymer and mineral particles: towards understanding effects of microplastics on planktonic filtrators
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This study examined how microplastics affect the swimming behavior of Daphnia (water fleas), finding that these filter-feeders are impaired even when exposed to plastic particles of low nutritional value — suggesting microplastics can compromise aquatic invertebrate health through mechanisms beyond simple malnutrition.
Influence of Particle Size and Feeding Conditions on Microplastic Ingestion and Depuration in Daphnia magna
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Scientists found that tiny water fleas (a key food source in aquatic ecosystems) eat more microplastics when they're hungry and when the plastic pieces are smaller, and what they'd previously eaten affected how quickly they cleared the plastic from their bodies. This matters because these tiny creatures are near the bottom of the food chain, so understanding how microplastics build up in them helps researchers predict how plastic pollution might move up toward the fish and seafood we eat.
Consumption and Impacts of Water-Borne Polypropylene Microplastics on Daphnia Similis
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This study exposed water fleas (Daphnia similis) to polypropylene microplastics and found that the particles accumulated in their digestive tracts and disrupted biochemical processes. Polypropylene is one of the most common plastics in consumer packaging, making it a major contributor to microplastic pollution in aquatic environments. Daphnia are a key link in aquatic food chains, so their disruption could affect fish and other wildlife that consume them.
Quantifying Polyethylene Microplastics Through Microscopy and Investigating Their Effects on Daphnia magna Growth Rate
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Researchers used a microscope to detect tiny polyethylene plastic beads in water fleas (Daphnia magna), finding plastic particles in most digested specimens tested. When juvenile Daphnia were fed algae with or without microplastics, growth rates and survival varied between groups, but results were inconclusive due to small sample sizes and high death rates in some groups.
The effect of microplastics on the speed, mortality rate, and swimming patterns of Daphnia Magna
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This study compared how polystyrene and polyethylene microplastics affect the swimming speed, mortality, and movement patterns of Daphnia magna water fleas, finding both plastics caused behavioral changes. Daphnia are key animals in freshwater food webs, and microplastic-induced behavioral impairment could affect their role in aquatic ecosystems.
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