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20 resultsShowing papers similar to Uncovering the potential effect of microplastics on Alexandrium pacificum: From the perspective of cyst formation and toxin production
ClearEffects of Polystyrene Microplastics on Growth and Toxin Production of Alexandrium pacificum
Researchers exposed the paralytic shellfish toxin-producing dinoflagellate Alexandrium pacificum to polystyrene microplastics and found that MP presence stimulated growth and increased toxin production per cell at certain concentrations, raising concerns about microplastics amplifying harmful algal bloom toxicity.
The Effecting Mechanisms of 100 nm Sized Polystyrene Nanoplastics on the Typical Coastal Alexandrium tamarense
Researchers examined the effects of 100-nanometer polystyrene nanoplastics on the harmful algal bloom species Alexandrium tamarense. They found that nanoplastic exposure inhibited algal growth and photosynthesis while increasing production of paralytic shellfish toxins and reactive oxygen species. The study suggests that nanoplastic pollution in coastal waters could worsen harmful algal bloom impacts by stressing toxin-producing algal species.
Microplastic characteristics differentially influence cyanobacterial harmful algal bloom microbial community membership, growth, and toxin production
Researchers investigated how different types of microplastics influence the growth and toxin production of harmful algal blooms in freshwater. They found that certain microplastic characteristics, such as shape and polymer type, significantly affected which microbial species thrived and how much toxin was produced. The study suggests that microplastic pollution may play an underappreciated role in worsening harmful algal blooms in lakes and reservoirs.
Tire microplastic particles and warming inhibit physiological functions of the toxic microalga Alexandrium pacificum
Researchers studied how tire-derived microplastic particles affect a toxic marine algae species under normal and warmed water conditions. They found that low concentrations slightly promoted algal growth, while high concentrations inhibited it, and warming made these negative effects worse. The study suggests that the combination of tire microplastics and rising ocean temperatures could disrupt marine ecosystems in compounding ways.
The effects of two sized polystyrene nanoplastics on the growth, physiological functions, and toxin production of Alexandrium tamarense
Polystyrene nanoplastics at two size ranges were found to inhibit growth and alter physiological functions of the harmful algal bloom dinoflagellate Alexandrium tamarense, with larger particles having stronger effects on toxin production and smaller particles causing more pronounced growth inhibition.
Functionalized nanoplastics alter physiology and toxin production in Alexandrium pacificum through surface charge effects
Researchers tested how surface-modified nanoplastics affect the harmful algae species Alexandrium pacificum, which produces paralytic shellfish toxins. They found that amino-modified nanoplastics had greater bioavailability to the algae and altered the composition of toxins produced, while all nanoplastic types impaired photosynthesis and triggered oxidative stress. The study suggests that nanoplastic surface chemistry plays a critical role in determining how these particles interact with and affect marine microorganisms.
Effects of polystyrene microplastics on growth, physiological traits of Microcystis aeruginosa and microcystin production and release
Researchers examined how polystyrene microplastics of various sizes affect the growth and toxin production of the harmful algae Microcystis aeruginosa. They found that microplastics inhibited algal growth at low densities, with the smallest particles causing the greatest inhibition, and also disrupted the algae's antioxidant defense system. Notably, microplastic exposure led to a significant increase in the production of the toxin microcystin-LR, raising concerns about how microplastic pollution could worsen harmful algal blooms.
Concentration dependent toxicity of microplastics to marine microalgae
Researchers exposed the marine microalga Chlorella sp. to polystyrene microplastics at concentrations of 10 and 50 mg/L, finding that even low concentrations inhibited growth and disrupted photosynthesis, while higher concentrations caused more pronounced oxidative stress.
Ecological risk analysis and prediction of microplastics' effects on Microcystis aeruginosa in freshwater system: a meta-analysis approach
This meta-analysis found that micro- and nanoplastics can both inhibit and stimulate the growth of Microcystis aeruginosa — a harmful algal bloom cyanobacterium — depending on particle size and degradability. Smaller, degradable plastics tend to promote algal growth, suggesting microplastic pollution could worsen toxic algal blooms in freshwater systems used for drinking water.
ROS meditated paralytic shellfish toxins production changes of Alexandrium tamarense caused by microplastic particles
Researchers investigated how polystyrene microplastics affect toxin production in Alexandrium tamarense, a harmful algal bloom-causing dinoflagellate. The study found that microplastic exposure triggered elevated reactive oxygen species levels, which in turn stimulated overproduction of paralytic shellfish toxins through enhanced biosynthesis pathways, providing the first evidence that microplastics can indirectly increase harmful algal toxin levels through oxidative stress mechanisms.
Evaluating physiological responses of microalgae towards environmentally coexisting microplastics: A meta-analysis
A meta-analysis of 52 studies found that microplastics inhibit microalgal growth and photosynthesis and induce oxidative damage, though microalgae can recover over time. Cyanobacteria are more vulnerable than green algae, and the relative size of microplastics to algal cells governs the mechanism of impact, while aged versus pristine microplastics have opposite effects on extracellular polymeric substance and microcystin production.
Plastic-associated harmful phytoplankton assemblages in coastal and off-shore habitats of the Mediterranean Sea
Researchers used qPCR to detect harmful algal bloom species and measure biotoxin concentrations on micro and macroplastic samples collected from coastal and offshore Mediterranean habitats, finding that all plastic samples harbored dinoflagellate and diatom communities including toxin-producing Alexandrium and Pseudo-nitzschia species, with paralytic shellfish toxin levels of 10 to 100 nanograms per square centimeter on plastic surfaces.
Assessment of the Influence of Size and Concentration on the Ecotoxicity of Microplastics to Microalgae Scenedesmus sp., Bacterium Pseudomonas putida and Yeast Saccharomyces cerevisiae
Researchers assessed the ecotoxicity of five common microplastic types on microalgae, bacteria, and yeast, finding that polyvinyl chloride caused the most growth inhibition and that smaller particle sizes generally increased harmful effects.
Toxic plastisphere: How the characteristics of plastic particles can affect colonization of harmful microalgae and adsorption of phycotoxins
Researchers found that microplastic particles in water can serve as surfaces for harmful algae to grow on and for algae-produced toxins to stick to. Smaller and sun-aged microplastic particles absorbed more toxins than larger or newer ones, meaning the most common microplastics in the environment may carry the greatest risk. This matters for human health because contaminated microplastics could transfer harmful algal toxins into seafood and drinking water.
Responses of Microcystis aeruginosa to polystyrene microplastics: Growth dynamics and implications for water treatment
Researchers studied how polystyrene microplastics affect the harmful freshwater algae Microcystis aeruginosa, which causes toxic algal blooms. They found that while microplastics initially suppressed algae growth, the algae eventually adapted and grew even more, producing higher levels of the dangerous toxin microcystin. The study suggests that microplastic pollution in freshwater could worsen harmful algal blooms and create additional water treatment challenges.
A multi-factor analysis evaluating the toxicity of microplastics on algal growth
This meta-analysis evaluated how microplastic characteristics such as polymer type, size, shape, and concentration influence algal growth, finding that effects range from inhibition to enhancement depending on multiple interacting factors.
Fate, abundance and ecological risks of microcystins in aquatic environment: The implication of microplastics
This review explores how microplastics in water can interact with microcystins, highly toxic compounds produced by harmful algal blooms, by adsorbing and transporting them through aquatic environments. The combination poses increased risks to human health because microplastics can carry these dangerous toxins into drinking water sources and through the food chain.
Growth inhibition, toxin production and oxidative stress caused by three microplastics in Microcystis aeruginosa
Researchers tested the effects of three common microplastic types, PVC, polystyrene, and polyethylene, on the growth and toxin production of the freshwater cyanobacterium Microcystis aeruginosa. They found that all three microplastics inhibited algal growth and triggered oxidative stress, with PVC causing the most severe effects. The study also revealed that microplastic exposure stimulated the production of microcystin toxins, suggesting that plastic pollution could worsen harmful algal bloom impacts in freshwater systems.
Unravelling the toxicity mechanisms of polystyrene nanoplastics on physiological and transcriptomic responses of the marine dinoflagellate Alexandrium minutum
Researchers exposed the toxic marine dinoflagellate Alexandrium minutum to polystyrene nanoplastics at concentrations from 0.1 to 50 mg/L and measured physiological responses and toxin production. NP exposure inhibited growth and photosynthesis, altered gene expression, and changed the profile of paralytic shellfish toxins produced by the alga.
A new look at the potential role of marine plastic debris as a global vector of toxic benthic algae
Researchers examined marine plastic debris as a global vector for toxic benthic algae, finding that floating plastics provide colonization surfaces that may expand harmful algal distribution and intensify toxic blooms across ocean regions.