We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Microplastics in freshwater environments across the high altitude region of Gilgit-Baltistan, Pakistan
AI summary Read the abstract
Even remote, high-altitude rivers and lakes in northern Pakistan contain tiny plastic particles, found in water, sediment, and fish. Farmed fish had the most microplastics, followed by market fish, while wild fish had the least, suggesting farming practices add extra plastic exposure. Since these fish are eaten locally, this raises questions about how much plastic ends up on people's plates.
Microplastics are increasingly recognized as pervasive contaminants in remote mountain freshwater ecosystems, yet evidence from high-altitude regions remains limited. This study investigated microplastics occurrence and characteristics in surface water, sediments, and fish from the Braldu-Shigar-Skardu freshwater system in Gilgit-Baltistan, northern Pakistan. Samples were collected from remote headwaters, tributaries, main river channels, and the Satpara Lake-Dam system. Fish originated from wild populations, farming facilities, and local markets to provide a broader assessment of microplastic exposure. Matrix-specific extraction protocols were applied, followed by stereomicroscope sorting and polymer identification by µFT-IR spectroscopy. Microplastics were detected in nearly all sites and matrices, with concentrations ranging from 1 to 17 MPs L -1 in water, 55–537 MPs kg -1 in sediments, and 1–11 MPs individual -1 in fish gastrointestinal tracts. Notably, highest frequency of microplastics occurrence was measured in farmed individuals (78%–83%), suggesting that aquaculture-related practices may represent an additional source of microplastics. Wild fish showed the lowest occurrence (25%), whereas those obtained from local markets revealed intermediate values (62%), indicating variable exposure across different pathways. Surface waters were dominated by small fragments and polypropylene, indicative of recent inputs and origin from fragmentation. Sediments showed a broader size distribution, and greater polymer diversity, consistent with their role as long-term sinks. The highest polymer diversity was highlighted in fish, indicating multiple exposure pathways. Spatial patterns did not show a geographical downstream increase, but rather a patchy distribution shaped by local anthropogenic input, hydrological connectivity, and depositional dynamics. Glacier-fed rivers primarily act as transport corridors, whereas low-energy environments such as Satpara Lake function as sinks promoting microplastics accumulation. Overall, the study provides the first integrated multi-compartment baseline for microplastics in Gilgit-Baltistan and supports future monitoring and management actions for these high altitude critical freshwater resources.
More Papers Like This
Characterization of weathered microplastics in freshwater and fish from the Central Himalayas
AI summary Read the abstract
Even remote, high-altitude lakes and rivers in the Himalayas aren't safe from plastic pollution—researchers found tiny plastic fibers (mostly from things like clothing and packaging) in both the water and the fish living there, with fish from one lake showing especially high levels. Since these fish are commonly eaten, this suggests microplastics can make their way from far-flung freshwater sources into our food, and the worn, cracked surfaces of these plastic bits may make it easier for them to absorb other harmful substances before reaching our plates.
Evidence of microplastic contamination in the food chain: an assessment of their presence in the gastrointestinal tract of native fish
AI summary Read the abstract
Researchers found microplastics, mainly polyethylene and polypropylene, in the guts of fish from the Swat and Kabul rivers in Pakistan. These rivers are primary freshwater sources for the region, and the contaminated fish are regularly consumed by local communities. The findings confirm that freshwater fish from polluted rivers are a pathway for microplastic exposure in people's diets.
Microplastic assessment in remote and high mountain lakes of Gilgit Baltistan, Pakistan
AI summary Read the abstract
Researchers assessed microplastic contamination in eight remote, high-altitude lakes in the mountains of northern Pakistan, finding plastic particles in both water and sediment at all locations. Despite the lakes being far from major population centers, microplastics were present at measurable levels, likely transported by wind and water from lower elevations. The contamination of these pristine mountain lakes is concerning because they serve as water sources for local communities.
Microplastics in the Surface Water and Gastrointestinal Tract of Salmo trutta from the Mahodand Lake, Kalam Swat in Pakistan
AI summary Read the abstract
Researchers detected microplastics in both the surface water and gastrointestinal tracts of brown trout (Salmo trutta) from a high-altitude lake in Pakistan, demonstrating that microplastic contamination has reached remote mountain ecosystems far from urban pollution sources.
Microplastics abundance in abiotic and biotic components along aquatic food chain in two freshwater ecosystems of Pakistan
AI summary Read the abstract
Researchers quantified microplastic abundance across multiple trophic levels in two Pakistani freshwater ecosystems, finding evidence of bioaccumulation along the food chain from water and sediment through invertebrates to fish species.
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.