[2] Following her Ph.D. she was a postdoctoral scientist at the Cary Institute of Ecosystem Studies before she joined the faculty of the Université de Montréal in 2003.
[3] She served on the steering committee for French National Centre for Scientific Research, and worked to set up the Secretariat for Future Earth.
[4] Maranger is known for her research on the biogeochemistry of lakes, ecosystem ecology, and the connections between human actions and water quality.
Her early research examined the role of viruses in aquatic systems in polar regions[5][6] and tracked the transfer of iron from bacteria into mixotrophic phytoplankton.
[8] She has modeled the amount of phosphorus that can be absorbed by lakes,[9] which impacts how long before ecosystems will recover from the addition of excess phosphate as fertilizer.