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Response of Coral Reef Dinoflagellates to Nanoplastics under Experimental Conditions Suggests Downregulation of Cellular Metabolism
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Coral reef dinoflagellates were exposed to nanoplastics under controlled laboratory conditions to examine effects on cell growth, aggregation, and physiology. The study found that nanoplastic exposure altered dinoflagellate behavior and cellular responses, with implications for reef symbiotic relationships that depend on algal health.
Plastic products contribute heavily to anthropogenic pollution of the oceans. Small plastic particles in the microscale and nanoscale ranges have been found in all marine ecosystems, but little is known about their effects upon marine organisms. In this study, we examine changes in cell growth, aggregation, and gene expression of two symbiotic dinoflagellates of the family Symbiodiniaceae, Symbiodinium tridacnidorum (clade A3), and Cladocopium sp. (clade C) under exposure to 42-nm polystyrene beads. In laboratory experiments, the cell number and aggregation were reduced after 10 days of nanoplastic exposure at 0.01, 0.1, and 10 mg/L concentrations, but no clear correlation with plastic concentration was observed. Genes involved in dynein motor function were upregulated when compared to control conditions, while genes related to photosynthesis, mitosis, and intracellular degradation were downregulated. Overall, nanoplastic exposure led to more genes being downregulated than upregulated and the number of genes with altered expression was larger in Cladocopium sp. than in S. tridacnidorum, suggesting different sensitivity to nano-plastics between species. Our data show that nano-plastic inhibits growth and alters aggregation properties of microalgae, which may negatively affect the uptake of these indispensable symbionts by coral reef organisms.
More Papers Like This
Response of coral reef dinoflagellates to nanoplastics under experimental conditions
AI summary Read the abstract
Researchers exposed symbiotic dinoflagellates from coral reefs to polystyrene nanoplastics and found that cell growth and aggregation were significantly reduced after 10 days. The findings suggest that nanoplastic pollution could harm the tiny algae that are essential to coral reef health, with potential consequences for reef ecosystems.
Response of Coral Reef Dinoflagellates to Nanoplastics under Experimental Conditions Suggests Downregulation of Cellular Metabolism
AI summary Read the abstract
This study exposed two coral reef symbiotic dinoflagellates (Symbiodinium tridacnidorum and Cladocopium sp.) to 42-nm polystyrene nanoplastics, finding reduced cell growth and aggregation alongside downregulation of genes related to photosynthesis, mitosis, and intracellular degradation. The results suggest nanoplastics inhibit the uptake and function of coral symbionts, potentially threatening reef health.
Uptake and Effects of Nanoplastics on the Dinoflagellate Gymnodinium corollarium
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This study exposed the marine dinoflagellate Gymnodinium corollarium to nanoplastics and found that, although the organism can ingest particles via phagotrophy, nanoplastic uptake disrupted cell growth and photosynthesis, highlighting the vulnerability of unicellular marine organisms to nanoplastic pollution.
Toxicity of microplastics and nano-plastics to coral-symbiotic alga (Dinophyceae Symbiodinium): Evidence from alga physiology, ultrastructure, OJIP kinetics and multi-omics
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Researchers studied how microplastics and nanoplastics damage Symbiodinium, the algae that live inside coral and keep reefs alive. Even at concentrations found in the real environment, the plastic particles disrupted photosynthesis, caused oxidative stress, and triggered metabolic problems in the algae. Since the breakdown of this coral-algae partnership leads to coral bleaching, microplastic pollution could threaten the reef ecosystems that support fisheries and coastal communities worldwide.
Microplastic exposure represses the growth of endosymbiotic dinoflagellate Cladocopium goreaui in culture through affecting its apoptosis and metabolism
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The coral symbiont alga Cladocopium goreaui was exposed to polystyrene microplastics for one week, resulting in reduced cell density and size, increased oxidative stress markers, and elevated apoptosis indicators. The findings suggest microplastics disrupt the physiology of reef-building coral symbionts, with implications for coral health.
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