Carbon and nutrient biogeochemistry and productivity in aquatic systems

I combine tools and principles from environmental chemistry, hydrology and limnology to understand carbon and nutrient fluxes and transformations across aquatic ecosystems. I apply the land-to-ocean aquatic continuum framework in this work to understand the impact that watershed processes have on downstream water quality. I am also actively involved in collaborations related to microbial diversity and productivity across landscapes. ​

Recent publications: 
  • Organic carbon dynamics across the land-ocean interface on the B.C. Central Coast: St. Pierre and Oliver et al. 2020 Limnol. Oceanogr. link
  • ​Chemical weathering drives CO2 consumption in glacial meltwaters: St. Pierre et al. 2019, PNAS, 116, 17690-17695. 
  • CH4 consumption driven by soil properties in Greenlandic heath landscapes: St. Pierre et al. 2019, Soil Biol. Biochem. 138, 107605.
  • Comprehensive limnology (physical, chemical, biological) of a High Arctic lake: St. Pierre et al. 2019. Sci. Reports  9, 4447. 
  • Aquatic microbial communities across a High Arctic watershed: Cavaco et al. 2019. FEMS Microbiol. Ecol. 95, fiz161.
  • Sedimentary microbial community composition (Ruuskanen et al. 2018. Front. Microbiol. 9, 1138.) and function (Ruuskanen et al. 2020. Limnol. Oceanogr. 65, S233-S247.) linked to biogeochemical gradients. 
Picture
Seasonal shifts in lake phytoplankton community composition in relation to water column nutrient stoichiometry. (From St. Pierre et al. 2019, Sci. Reports.)