I am a first year PhD student in Dr. Shefferson’s lab at the University of Tokyo under the Graduate Program on Environmental Sciences within the Graduate School of Arts and Sciences. For my MS project here at UTokyo I found evidence of age-specific senescence that varied according to microsite density within a population of the small yellow lady's slipper, Cypripedium parviflorum. Historically, the mechanisms behind the evolution of senescence were considered to be strictly genetic. I used 23 years of mark-recapture data we formulated matrix models, reverse-age analyses, and selection gradients to show density also influenced the evolution of senescence. For my PhD I plan to continue to investigate life history evolution in mixotrophic and autotrophic plants.