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Gross Negligence: Impacts of Microplastics and Plastic Leachates on Phytoplankton Community and Ecosystem Dynamics
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This review examines how microplastics and chemical leachates from plastic debris affect phytoplankton, the microscopic organisms that form the base of aquatic food webs and produce much of Earth's oxygen. Researchers found that these pollutants can alter phytoplankton growth, photosynthesis, and community composition, with cascading effects on ecosystem health. The study warns that disruption of phytoplankton communities could have far-reaching consequences for ocean productivity and global carbon cycles.
Plastic debris is an established environmental menace affecting aquatic systems globally. Recently, microplastics (MP) and plastic leachates (PL) have been detected in vital human organs, the vascular system, and in vitro animal studies positing severe health hazards. MP and PL have been found in every conceivable aquatic ecosystem─from open oceans and deep sea floors to supposedly pristine glacier lakes and snow covered mountain catchment sites. Many studies have documented the MP and PL impacts on a variety of aquatic organisms, whereby some exclusively focus on aquatic microorganisms. Yet, the specific MP and PL impacts on primary producers have not been systematically analyzed. Therefore, this review focuses on the threats posed by MP, PL, and associated chemicals on phytoplankton, their comprehensive impacts at organismal, community, and ecosystem scales, and their endogenous amelioration. Studies on MP- and PL-impacted individual phytoplankton species reveal the production of reactive oxygen species, lipid peroxidation, physical damage of thylakoids, and other physiological and metabolic changes, followed by homo- and heteroaggregations, ultimately eventuating in decreased photosynthesis and primary productivity. Likewise, analyses of the microbial community in the plastisphere show a radically different profile compared to the surrounding planktonic diversity. The plastisphere also enriches multidrug-resistant bacteria, cyanotoxins, and pollutants, accelerating microbial succession, changing the microbiome, and thus, affecting phytoplankton diversity and evolution. These impacts on cellular and community scales manifest in changed ecosystem dynamics with widespread bottom-up and top-down effects on aquatic biodiversity and food web interactions. These adverse effects─through altered nutrient cycling─have "knock-on" impacts on biogeochemical cycles and greenhouse gases. Consequently, these impacts affect provisioning and regulating ecosystem services. Our citation network analyses (CNA) further demonstrate dire effects of MP and PL on all trophic levels, thereby unsettling ecosystem stability and services. CNA points to several emerging nodes indicating combined toxicity of MP, PL, and their associated hazards on phytoplankton. Taken together, our study shows that ecotoxicity of plastic particles and their leachates have placed primary producers and some aquatic ecosystems in peril.
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This book chapter reviews how microplastics affect coastal phytoplankton communities, covering physical clogging, chemical toxicity, and disruption of photosynthesis and cell division across diatoms, dinoflagellates, and cyanobacteria. Since phytoplankton form the base of marine food webs and produce roughly half of Earth's oxygen, widespread microplastic-driven decline in these communities would have cascading consequences for ocean ecosystems and global climate.
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Researchers found that chemicals leaching out of plastic debris can severely disrupt marine microbial communities, damaging tiny photosynthetic organisms (picophytoplankton) and dramatically reshaping the ocean microbiome. These findings reveal that plastic pollution harms ocean life not just physically but through chemical contamination, with potential consequences for the entire marine food web.
Effects of microplastics pollution on plankton: A review.
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This review summarizes the sources and characteristics of microplastics and their documented effects on plankton, including reduced growth, altered feeding, and reproductive impacts. As the base of aquatic food webs, plankton health is critical, making microplastic threats to these organisms a significant ecological concern.
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Researchers studied the combined effects of microplastic pollution and rising ocean temperatures on tiny marine plants called phytoplankton. While microplastics alone had minimal impact at current temperatures, when combined with warmer water conditions, phytoplankton biomass dropped by 41% and diversity fell by nearly 39%. The study suggests that climate change may dramatically amplify the harmful effects of microplastic pollution on the ocean organisms responsible for a significant portion of global carbon capture.
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