A recent study suggests that climate change has led to significant changes in the algae population of Great Bear Lake in the Northwest Territories since the early 2000s. Researchers emphasize the need for further investigation to understand the implications for the lake’s ecosystem. The study, recently published in the Proceedings of the National Academy of Sciences (PNAS), highlights the impact of increased ice-free days and rising air temperatures on the “rapid algal community restructuring” in large northern lakes like Great Bear.
According to John Smol, a biology professor at Queen’s University and co-director of the Paleoecological Environmental Assessment and Research Lab (PEARL), the altered algae types may have varying effects on the lake’s food chain, creating both winners and losers. Previous research on nearby Great Slave Lake revealed a shift in algae compositions towards varieties with lower caloric content.
By analyzing sediment cores from different parts of Great Bear Lake, the research team determined the changes in algae species over time. The transition from shallow-water algae typical of ice-covered lakes to species thriving in open water signifies a significant shift. Despite the lakes’ immense size, comparable to countries like Belgium, researchers were surprised by the observed changes due to their presumed thermal inertia.
Environmental scientist Reid Stoyberg, who has extensive experience fishing on Great Bear Lake, noted the lack of conclusive data to assess the impacts on fish populations and other aquatic life. Stoyberg emphasized the importance of continued research to monitor any potential ecosystem shifts and adaptations. Given the harsh environment of Great Bear Lake, species must evolve to survive any changes that could disrupt the delicate balance of the ecosystem.