Researchers have explored the impact of nanoplastics on aquatic life in lakes and rivers, yielding some unexpected findings. They are the first to reveal that certain species are facing extinction, while others, particularly cyanobacteria that contribute to harmful algal blooms, remain entirely unaffected.
Researchers at Lund University in Sweden have explored the impact of nanoplastics on aquatic life in lakes and rivers, yielding some unexpected findings. They are the first to reveal that certain species are facing extinction, while others, particularly cyanobacteria that contribute to harmful algal blooms, remain entirely unaffected.
Every year, the volume of plastic entering the oceans around the globe ranges from five to 13 million tonnes. Over time, this plastic degrades into micro and nanoparticles that cannot be seen without a microscope. The team at Lund University has focused on how these tiny plastic particles influence life within aquatic ecosystems.
The research indicated that specific grazing zooplankton species, particularly daphnia, which are vital food sources for fish, are especially at risk. Phytoplankton diatoms also experienced significant negative impacts. In contrast, other algal types, such as blue-green algae (cyanobacteria), showed no adverse effects whatsoever.
“We still do not understand why certain species are declining while others seem to flourish normally. If nanoplastic levels continue to rise, even those species currently managing a few particles might begin to falter,” explains Lars-Anders Hansson, a professor of aquatic ecology.
The study was conducted in man-made wetlands designed to mimic natural environments closely, suggesting that the findings can likely be applied to natural ecosystems. The varying impacts on different organisms could lead to major alterations in the food web and ecosystem dynamics, including a reduction in grazing zooplankton and an increase in algal blooms.
“The levels of nanoplastics we examined are relatively low, closely reflecting the concentrations already found in our water bodies,” says Lars-Anders Hansson.
The researchers plan to further their studies to better understand the effects of these nefarious nanoplastic particles, which have the ability to infiltrate cell membranes, on various species in freshwater ecosystems.
“Looking at the bigger picture, our research contributes important knowledge and serves as a foundation for future initiatives aimed at addressing the clear issues presented by plastic, even though it is a valuable material in many aspects of contemporary life,” concludes Lars-Anders Hansson.
