We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Spatial distribution of microplastics in a large watershed: a case study of the Ottawa River watershed
AI summary Read the abstract
A large-scale sampling survey of the Ottawa River watershed found microplastics at fairly uniform concentrations across 105 locations, with no dramatic accumulation downstream — except at boat launch sites, which showed higher levels. The results suggest that microplastic inputs are distributed across the whole watershed rather than originating from a few point sources, complicating efforts to control pollution at the river system scale.
River water was sampled at 105 locations in the Ottawa River watershed and analysed for microplastics. Sampling techniques were standardised and replicated at each sample location to give an indication of the spatial extent of microplastics at the watershed scale. Microplastic concentrations remained largely uniform, with no clear accumulation of microplastics towards the lower reaches of the watershed. An ANCOVA analysis determined that the only significant relationships to microplastic concentration were distance downstream on the main channel and tributaries and an increase of microplastic concentrations at boat launch locations. However, these relationships were not strong (R value of 0.15) and suggest a more complex interaction of microplastics in large watersheds. It is recommended that further research on microplastic pollution in rivers needs to also focus on temporal factors in addition to considering sinks as an important element in the distribution of microplastics at the watershed scale.
More Papers Like This
Microplastic abundance and distribution in the open water and sediment of the Ottawa River, Canada, and its tributaries
AI summary Read the abstract
All water and sediment samples collected from the Ottawa River contained microplastics, with concentrations in nearshore samples higher than in mid-river trawl samples. The study provides baseline contamination data for a major Canadian river and highlights urban rivers as significant sources of microplastics flowing toward marine systems.
Spatial and temporal variation of microplastics in the Ottawa River watershed with citizen science as a complementary sampling methodology
AI summary Read the abstract
Researchers measured microplastic concentrations in water and sediment across the Ottawa River watershed in Canada, finding elevated concentrations during storm and snowmelt events linked to sewage overflows. The study demonstrated that precipitation-driven spikes in microplastic loading are a significant and often underestimated source of contamination.
Abundance, Distribution and Drivers of Microplastic Contaminant in Urban River Environments
AI summary Read the abstract
Researchers surveyed microplastic distribution in urban river environments and identified key drivers of accumulation hotspots, finding that land use, hydrology, and infrastructure factors concentrated microplastics at predictable locations that could inform targeted management interventions.
Citizen science sampling programs as a technique for monitoring microplastic pollution: results, lessons learned and recommendations for working with volunteers for monitoring plastic pollution in freshwater ecosystems
AI summary Read the abstract
Volunteers monitored microplastic contamination along 550 km of the Ottawa River in Canada using a standardized method, finding microplastics at almost every sampling site. Citizen science programs like this show promise for scaling up microplastic monitoring at low cost.
Evaluating community science sampling for microplastics in shore sediments of large river watersheds
AI summary Read the abstract
Researchers coordinated 42 citizen science volunteers across 68 locations spanning 750 km of the Ottawa River Watershed to collect sediment samples for microplastic analysis, finding relatively low particle concentrations compared to other freshwater watersheds and demonstrating that community science effectively enables large spatial coverage while requiring strict laboratory quality control protocols.
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.