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Thesis Chapter 4: Measuring shading effect from floating microplastics, microplastic exposure in biofilm, and influence of MPs on biofilm in mesocosms
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This study used outdoor tank experiments (mesocosms) with added microplastics to examine freshwater biofilm communities. Researchers measured how floating microplastics blocked light, how much microplastic ended up within the biofilm, and how the biofilm's overall growth was affected.
Overarching thesis objective is to evaluate fate and effects of microplastics on freshwater algae, with a focus on biofilm communities. Five data chapters (2-6 of thesis). Chapter 4: Measures shading effects from floating microplastics, exposure within biofilm, and standing crop measurements of biofilm from outdoor mesocosms with microplastic additions.
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Chapter 5: Evaluates standing crop measurements and metabolic responses of biofilms developed in three different mesocosm experiments each spiked on a regression with microplastics
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This study looked at biofilms, thin layers of microorganisms, grown in three separate lab tank experiments where microplastic levels were gradually increased. It measured the amount of biofilm growth and its metabolic activity in response to the different microplastic amounts. The abstract does not provide specific results of these measurements.
Impacts of plastic surface on the periphyton under different nutrient and temperature: A mesocosm experiment
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This mesocosm experiment investigated how microplastics affect periphyton (biofilm communities that grow on surfaces in water) under different nutrient levels and temperatures. Microplastics altered periphyton development in ways that could affect oxygen production and the feeding of organisms that graze on biofilm, with potential ripple effects throughout aquatic food webs.
Microalgae colonization of different microplastic polymers in experimental mesocosms across an environmental gradient
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Microalgal colonization of five different microplastic polymer types was monitored in freshwater mesocosms across an environmental gradient, finding that polymer type, surface properties, and environmental conditions all influenced the biomass and community composition of epiplastic microalgal biofilms.
The impacts of polystyrene microplastics on development, energy transfer and nutrient cycling of biofilms: A comprehensive chronic toxicity study
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A chronic toxicity study found that polystyrene microplastics inhibited freshwater biofilm development, reducing biomass, photosynthetic activity, and nutrient cycling rates, with effects increasing with MP concentration over the 60-day exposure period.
Assessment of Biofilm Growth on Microplastics in Freshwaters Using a Passive Flow-Through System
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Researchers developed a laboratory flow-through system to study how biofilms grow on microplastics under controlled freshwater conditions. They found that biofilm formation varied depending on the polymer type, water temperature, and nutrient levels, with warmer and more nutrient-rich conditions promoting faster colonization. The study provides a standardized method for assessing how microplastics in freshwater systems become platforms for microbial communities that could include harmful organisms.
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