David A McLennan

David A McLennan


As a member of the Integrative Ecosystems Science group, McLennan provides ecophysiological field and laboratory support focused on the response of terrestrial ecosystems to climate change and extreme weather events including elevated atmospheric CO2, increased temperature and shifts in precipitation patterns.

McLennan’s primary duties focus on direct measurements of mechanistic plant responses including foliar and woody gas exchange (photosynthesis and respiration), phenology, chemistry, anatomy and water relations. He travels to northern Minnesota for 1-2 week long measurement campaigns at our flagship experiment ‘Spruce and Peatland Responses Under Changing Environments’ (SPRUCE) & supports other projects within the group as needed, including the Next Generation Ecosystem Experiments (NGEE Arctic; NGEE Tropics) and The Impact of Extreme Weather Events on Plant Species, Competition, and Ecological Function.

His work involves ecophysiology techniques and equipment, including use of the Li-COR 6400 and LiCOR 6800 photosynthesis and fluorescence systems, Picarro isotope analyzers, Scholander pressure chamber (leaf water potential), soil moisture sensors, sap flow sensors, Campbell dataloggers, pressure-volume curves, tissue sectioning and mounting, wetchemistry lab techniques, general lab techniques, written and oral communication, troubleshooting problems with equipment & some data processing and analysis.



  • Guha, Anirban., Han, Jimei., Cummings, Cadan., McLennan, David A., Warren, Jeffrey M., (2018) Differential ecophysiological responses and resilience to heat wave events in four co-occurring temperate tree species, Environmental Research Letters., Volume 13 Number 6 5008.