We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Distribution of plastic polymer types in the marine environment; A meta-analysis
AI summary Read the abstract
This meta-analysis pools data from studies worldwide to map which types of plastic polymers are found in different parts of the ocean. The research found that plastic particles sort themselves by density, with lighter plastics floating at the surface and denser ones sinking to the seafloor, creating distinct contamination patterns. Understanding where different plastics accumulate helps predict which marine organisms are most exposed and how microplastics may enter the seafood supply chain.
Despite growing plastic discharge into the environment, researchers have struggled to detect expected increases of marine plastic debris in sea surfaces, sparking discussions about "missing plastics" and final sinks, which are hypothesized to be coastal and deep-sea sediments. While it holds true that the highest concentrations of plastic particles are found in these locations (103-104 particles m-3 in sediments vs. 0.1-1 particles m-3 in the water column), our meta-analysis also highlights that in open oceans, microplastic polymer types segregated in the water column according to their density. Lower density polymers, such as polypropylene and polyethylene, dominated sea surface samples (25% and 42%, respectively) but decreased in abundance through the water column (3% and 2% in the deep-sea, respectively), whereas only denser polymers (i.e. polyesters and acrylics) were enriched with depth (5% in surface seawater vs. 77% in deep-sea locations). Our meta-analysis demonstrates that some of the most abundant and recalcitrant manufactured plastics are more persistent in the sea surface than previously anticipated and that further research is required to determine the ultimate fate of these polymers as current knowledge does not support the deep sea as the final sink for all polymer types.
More Papers Like This
Buoyant microplastics in the marine environment
AI summary Read the abstract
This meta-analysis examined where microplastics end up in the ocean and found that lighter plastics like polyethylene and polypropylene float near the surface, while denser types sink deeper. The research also developed better methods for detecting very small microplastic particles (under 1 mm) and found that previous studies likely undercounted them. These findings suggest there may be far more microplastics in the ocean than earlier estimates indicated, which matters for understanding how they enter the food chain.
The distribution of subsurface microplastics in the ocean
AI summary Read the abstract
This study combined data from nearly 2,000 ocean sampling stations to map how microplastics are distributed at different depths. Smaller microplastics spread more evenly through the water column, while larger ones tend to concentrate near the surface. At deep ocean depths, microplastics make up an increasing share of total organic particles, suggesting they are becoming a significant part of the deep ocean environment.
Polymer composition of microplastics in marine organisms across trophic levels
AI summary Read the abstract
Researchers reviewed data from 16 studies to examine which types of microplastics are found in marine organisms across different levels of the food chain. They found that polyethylene, polypropylene, and polyethylene terephthalate were the most common polymers, with accumulation patterns varying between herbivores, omnivores, and carnivores. The study highlights how microplastic contamination is widespread throughout marine food webs, raising concerns about potential transfer to humans through seafood consumption.
Estimating global marine surface microplastic abundance: systematic literature review
AI summary Read the abstract
Researchers conducted a systematic literature review to estimate global marine surface microplastic abundance, compiling data from studies worldwide to produce abundance maps. The study found significant variation in microplastic concentrations across different ocean regions, providing a broader picture of the scale and distribution of marine microplastic pollution.
Investigation of the abundance, distribution and composition of microplastics at coastal upwelling sites in the Atlantic Ocean
AI summary Read the abstract
A study investigated the abundance, distribution, and chemical composition of microplastics in a marine environment, characterizing particle types, polymer identities, and spatial patterns. The findings contribute to understanding how microplastic contamination varies across different marine zones.
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.