Cyanobacteria Blooms in Great Slave Lake

By combining Traditional, local, and scientific knowledge sources, we document new and increasing cyanobacteria blooms over time in Great Slave Lake.

Data and Resources

Additional Info

Field Value
Creator NWT Cumulative Impact Monitoring Program
Summary By combining Traditional, local, and scientific knowledge sources, we document new and increasing cyanobacteria blooms over time in Great Slave Lake (also known as Tinde’e, Tucho, and Tu Nedhé). Over the last 15 years, these blooms have become more frequent, denser, and spread to new areas, becoming the most widespread and dense in 2024. These blooms are likely climate-driven, made worse by the cumulative impacts of warmer water, reduced wind and ice cover, and nutrient inputs from wildfires, permafrost thaw, and human activities.
Local Relevance This is relevant to the Northwest Territories for understanding the ways climate change and other cumulative impacts are affecting Great Slave Lake.
Notes This bulletin is part of the Cumulative Impact Monitoring Program's NWT Environmental Research Bulletin series - Volume 10, Issue 80.
Tags Great Slave Lake,Traditional Knowledge,Algae
Geographic Region NWT
Release Date 2025-09-01
Last Modified Date 2025-09-01
Funding Program NWT Cumulative Impact Monitoring Program