Selective ingestion and response by Daphnia magna to environmental challenges of microplastics

Wang, Mengjing; Wang, Wen‐Xiong

doi:10.1016/j.jhazmat.2023.131864

Cited by 5 publications

(4 citation statements)

References 30 publications

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“…This held the daphnia in place, but allowed full freedom of movement of its antenna and appendages. This is a common approach used in zooplankton investigations where the animal must remain in place but without harm [ 32 ]. Other researchers have also used methylcellulose to achieve the same result [ 33 ], or silicone rubber [ 34 ].…”

Section: Methodsmentioning

confidence: 99%

Ciliated Epibionts Modify the Cardiac Stress Reaction to Perceived Predation in Daphnia

Davis,

Gloege

2024

Microorganisms

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When animals perceive an acute stressor like a predator, they typically undergo a suite of physiological changes that function to improve survival during the encounter, such as elevation in cardiac output, to supply more energy to muscles. If bodily energy is limited, such as by parasites or infections, these functions could become less efficient and lessen host survival. In the aquatic world of microorganisms, individuals can become colonized by other organisms on their surface (epibionts), which could sap energy from their host from their weight, or even compete with the host for food. Here, we tested if one epibiont (a ciliated protozoan, Vorticella spp.) affects its hosts’ ability to mount a physiological stress reaction. We collected wild daphnia (Daphnia ambigua) that had varying burdens of these on their bodies and exposed them to a simulated stressor (crushed daphnia, to simulate nearby predation) under a microscope while monitoring for changes in their heart rates in real time. Out of 121 daphnia, those with no Vorticella epibionts showed no meaningful changes in their heart rate after exposure, but those with light or heavy burdens showed immediate elevations (within 5 min). Moreover, the heart rates of heavily burdened daphnia continued to rise for 1.5 h thereafter, to as much as 17% higher than at baseline. These patterns were unexpected, as they suggest that the ciliated epibionts act to elevate their hosts’ physiological reaction, rather than dampen it, perhaps by churning the water column around the host, thereby enhancing the chemical alarm cue. The procedures used in this study may be useful for future investigations into the acute stress reactions of daphnia or other microorganisms.

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Section: Methodsmentioning

confidence: 99%

Ciliated Epibionts Modify the Cardiac Stress Reaction to Perceived Predation in Daphnia

Davis,

Gloege

2024

Microorganisms

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“…PLA particles used in the study measured 50x50 µm, as opposed to 50x10µm for PET and Nylon. Daphnia ingests larger MP particles at a greater rate than smaller particles (Wang & Wang, 2023), suggesting that the PLA particles used in the study might have accumulated faster than the two other MP in the Daphnia digestive tract, potentially obstructing it and hindering proper digestion and nutrient absorption, ultimately leading to starvation. Another significant factor is the pond inoculum effect: Daphnia cultured with bacterioplankton derived from the MP-rich BP pond had the highest survival rates and those cultured with the MP-poor DG pond were 25% more at risk of death.…”

Section: Effects Of Mp On Daphnia Magna Survivalmentioning

confidence: 99%

Effects of microplastics on Daphnia-associated microbiomes in situ and in vitro

Krzynowek,

Van de Moortel,

Pichler

et al. 2024

Preprint

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Microplastics (MP) pollution in aquatic environments is a growing global concern. MP, defined as plastic fragments smaller than 5mm, accumulate in freshwater reservoirs, especially those located in urban areas, impacting the resident biota. This study investigated the effects of MP on the performance and microbiome of Daphnia, a keystone organism in freshwater ecosystems, through both in situ sampling of freshwater ponds and a controlled 23-day in vitro exposure experiment. Using 16S rRNA gene sequencing and whole-genome shotgun sequencing, the microbiome community composition and functional capacity was analysed and correlated with MP pollution levels. Urban ponds showed higher MP concentrations in both water and sediment than natural ponds with significant differences in MP composition. Bacterioplankton communities were more diverse and richer than the Daphnia-associated microbiomes. Overall, the in situ study showed that the composition of the Daphnia-associated community co-varied with high MP levels but also with temperature and redox potential. Moreover, the functional analysis showed increased relative abundances of PET degradation enzymes and antibiotic resistance genes (ARGs) in microbiomes from high-MP ponds. In the in vitro experiment, the bacterioplankton inoculum source significantly influenced Daphnia survival and microbiome composition. Daphnia exposed to high MP concentrations inoculated with bacterioplankton pre-exposed to MP exhibited significantly higher survival rates, suggesting potential adaptive benefits from MP-associated microbiomes. Network analysis identified specific taxa associated with MP within the Daphnia microbiome. Our study suggests adaptive responses of freshwater host-associated microbiomes to MP pollution including biodegradation with potential benefits for the host.

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“…Comparison between the positively charged AIE-NH 2 -NPs and negatively charged AIE-COOH-NPs, approximately 230 nm and 21 µm, respectively, demonstrated that the size and surface charge of the AIE significantly altered the selectivity of D. magna. The daphnids exhibited a selective ingestion of larger, positively charged plastics, which accumulated in the middle and posterior gut [93]. Fluorescent PS-COOH accumulated and retained in the gut of other zooplankton species, rotifer Brachionus plicatilis.…”

Section: Advances In Research On the Bioavailability From Waterborne ...mentioning

confidence: 99%

Progress in Research on the Bioavailability and Toxicity of Nanoplastics to Freshwater Plankton

Slaveykova,

Marelja

2023

Microplastics

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The present review critically examines the advancements in the past 5 years regarding research on the bioavailability and toxicity of the nanoplastics (NPLs) to freshwater plankton. We discuss the recent progress in the understanding of adsorption, absorption, trophic transfer, and biological effects in phyto- and zooplankton induced by NPLs exposure. The influence of plankton on NPLs’ bioavailability via the excretion of biomolecules and formation of eco-corona is also examined. Despite important research developments, there are still considerable knowledge gaps with respect to NPLs’ bioavailability and trophic transfer by plankton as well as a potential adverse effect in natural aquatic systems. As plankton play a critical role in primary production, nutrient cycling, and food web structure, understanding the interactions between NPLs and plankton is essential in assessing the potential implications of NPLs pollution for aquatic ecosystem biodiversity and services.

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Selective ingestion and response by Daphnia magna to environmental challenges of microplastics

Cited by 5 publications

References 30 publications

Ciliated Epibionts Modify the Cardiac Stress Reaction to Perceived Predation in Daphnia

Ciliated Epibionts Modify the Cardiac Stress Reaction to Perceived Predation in Daphnia

Effects of microplastics on Daphnia-associated microbiomes in situ and in vitro

Progress in Research on the Bioavailability and Toxicity of Nanoplastics to Freshwater Plankton

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