Ancient ground squirrel communities of New Mexico
I am developing methods for identification of late Quaternary ground squirrel fossils from sites across southern New Mexico. This work combines geometric morphometrics, maximum likelihood inference, and the rich fossil record of this region to address responses of ground squirrel species and communities to past climate change.
High-elevation mammal ecology during the last ice age
We analyzed stable carbon and oxygen isotopes from fossil tooth enamel of mammals - specifically, marmots and woodrats - to understand their dietary responses to climate changes of the past ~50,000 years in Colorado.
Paleophysiology of high-elevation plants
Using similar isotopic methods, and adding material from an additional paleontological site, we determined the physiological responses of high-elevation herbaceous plants to extreme CO2 shifts during the last ice age and at its' termination.