A recent study indicates a significant shift in the algae population of Great Bear Lake in the Northwest Territories due to climate change. The research, featured in the Proceedings of the National Academy of Sciences (PNAS) journal, highlights the impact of increased ice-free days and rising air temperatures on the lake’s algal community.
John Smol, a biology professor at Queen’s University and co-director of the Paleoecological Environmental Assessment and Research Lab (PEARL), emphasized the need for further investigation to understand the implications for organisms dependent on algae and the broader food chain. He pointed out that with reduced ice cover, there could be an overall increase in algae, but the specific changes in algae types are still unclear.
The study involved analyzing sediment layers from core samples taken from various parts of Great Bear Lake to track environmental changes over time. Comparisons were also made with research on Lake Hazen and Great Slave Lake in the region. Researchers observed a shift in the composition of algae species in Great Bear Lake from shallow-water types common in ice-covered lakes to those thriving in open water.
Despite the vast size of these lakes, researchers noted significant recent changes, which surprised them. Smol highlighted the shift towards species adapted to open water environments, a departure from the previously dominant shallow-water varieties.
Environmental scientist Reid Stoyberg, who has extensive experience as a fishing guide at Great Bear Lake, acknowledged the study’s findings but emphasized the need for more data before drawing definitive conclusions. Stoyberg noted the importance of ongoing research to monitor potential impacts on the lake’s ecosystem.
In such a challenging environment, species in Great Bear Lake must adapt to survive, Stoyberg explained. He emphasized the potential consequences of any ecosystem changes, highlighting the necessity for continued observation and research to understand the evolving dynamics of the lake.