We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Ecological implications of biodegradable and conventional microplastics: Dissolved organic matter bioavailability and microbial response in marine systems
AI summary Read the abstract
Researchers compared the dissolved organic matter released by biodegradable and conventional microplastics and assessed its bioavailability to marine microbial communities. They found that biodegradable plastics like PLA released organic matter that was more readily used by microorganisms, which altered microbial community composition. The study suggests that while biodegradable plastics break down faster, their leached compounds may have distinct and potentially significant ecological effects in marine environments.
The increasing accumulation of microplastics (MPs) in marine environments raises concerns about their ecological impacts, particularly through the release of dissolved organic matter (DOM). However, the bioavailability and ecological effects of MPs-derived DOM (MPs-DOM) remain poorly understood. In this study, we systematically investigated the leaching characteristics and microbial bioavailability of DOM derived from three biodegradable MPs (BMPs) including polylactic acid (PLA), polycaprolactone (PCL), polybutylene adipate terephthalate (PBAT) and two conventional MPs (CMPs, PE: polyethylene, PET: polyethylene terephthalate) under simulated photoaging. Our results demonstrated that BMPs released significantly more dissolved organic carbon (DOC) than CMPs, with PBAT showing the highest yield (40.77 vs. PE: 11.63 mg-DOC g-C). Optical analyses revealed that BMPs-DOM contained more protein-like fluorescent components, with higher fluorescence index and biological index, indicating greater lability. BMPs-DOM stimulated microbial growth more efficiently, with PBAT supporting the highest bacterial concentrations (∼52 ×10 cells mL) and DOC utilization (76.39 %). 16S rRNA sequencing revealed that MPs-DOM exposure reduced community richness, reshaped microbial communities through selective enrichment of copiotrophic and plastic-degrading taxa (e.g., Pseudomonas, Bacteroidota), and promoted stochastically driven assembly with specialized functional modules. Our study highlights that while BMPs may alleviate particulate plastic accumulation, their labile DOM release warrants careful evaluation for potential impacts on marine microbial ecology.
More Papers Like This
Divergent Shifts in Sediment Dissolved Organic Matter Stability and Microbial Carbon Metabolic Potential Induced by Biodegradable and Conventional Microplastics
AI summary Read the abstract
"Biodegradable" plastics are often marketed as eco-friendly, but this study found they still disrupt sediment ecosystems, changing the chemistry of organic matter and shifting microbial communities much like conventional plastics do. This matters because these microbial and chemical changes could affect water quality and nutrient cycling, showing that swapping to biodegradable plastics isn't automatically safer for the environment.
Insights into the photoaging behavior of biodegradable and nondegradable microplastics: Spectroscopic and molecular characteristics of dissolved organic matter release
AI summary Read the abstract
Researchers compared how biodegradable and conventional microplastics break down under ultraviolet light and what dissolved substances they release. They found that biodegradable PLA microplastics released more protein-like organic matter during UV exposure than conventional polystyrene, and this matter was more readily used by microorganisms. The study suggests that biodegradable plastics, while designed to be better for the environment, may introduce different ecological risks as they break down.
Accumulation and release of organic pollutants by conventional and biodegradable microplastics in the marine environment
AI summary Read the abstract
Researchers compared how biodegradable and conventional microplastics accumulate and release organic pollutants in natural seawater over 64 days. They found that biodegradable plastics like PHA and PBS accumulated similar types and levels of pollutants as conventional polyethylene. The study suggests that switching to biodegradable plastics may not reduce the risk of these materials acting as carriers for toxic chemicals in the marine environment.
Dissolved organic carbon leaching from microplastics and bioavailability in coastal ecosystems
AI summary Read the abstract
Researchers evaluated dissolved organic carbon leaching from polyethylene and polypropylene microplastics in coastal ecosystems, finding that up to 85% of the leached carbon was biodegradable by microbial communities. The study found that different coastal environments, such as seagrass beds and river mouths, showed varying abilities to utilize this plastic-derived carbon, suggesting microplastics may be an underappreciated source of dissolved organic carbon in marine systems.
Biodegradable and conventional microplastics exhibit distinct microbiome, functionality, and metabolome changes in soil
AI summary Read the abstract
Researchers compared the effects of conventional plastics (polyethylene and polystyrene) and biodegradable plastics (polylactide and polybutylene succinate) on soil microbial communities. They found that both types of microplastics significantly altered soil microbial composition, but biodegradable microplastics had a more pronounced impact on soil metabolic function and microbial activity than conventional ones.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.