A recent study suggests that the algae population in the Great Bear Lake in the Northwest Territories has undergone significant changes due to climate change in recent years. The research, published in the Proceedings of the National Academy of Sciences (PNAS) journal, points out that increased air temperatures and a greater number of ice-free days have led to a rapid restructuring of the algal community in large northern lakes like the Great Bear Lake.

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 environment may result in winners and losers among the creatures that rely on algae as food. The study highlights a shift in the types of algae present, raising uncertainties about the implications for the ecosystem.

By analyzing sediment core samples from various parts of the Great Bear Lake, the research team determined that the composition of algae species has transitioned from shallow-water varieties typical of ice-covered lakes to those thriving in open water. Surprisingly, similar changes were observed in Lake Hazen and Great Slave Lake in the Northwest Territories.

Despite observations of significant transformations in these massive lakes, researchers were taken aback by the pace of change due to the thermal inertia typically associated with such large bodies of water. Environmental scientist Reid Stoyberg, who has extensive experience on the Great Bear Lake, emphasized the need for additional data before drawing definitive conclusions about the impact on the lake’s ecosystem.

Stoyberg acknowledged the importance of monitoring further changes in the lake, emphasizing the necessity for species to adapt to survive in the challenging environment. He highlighted the potential consequences of disruptions to the ecosystem and the subsequent need for species to evolve survival strategies in response.