Lynda Delph

Lynda Delph

Distinguished Professor, Biology

Evolution, Ecology and Behavior Section Associate Chair, Biology

  • (812) 855-1831
  • Jordan Hall 119B
  • Office Hours
    By Appointment Only


  • Postdoctoral Fellow, Rutgers University, 1989
  • Ph.D., University of Canterbury, 1988
  • M.Sc., University of Arizona, 1983
  • B.Sc., University of Arizona, 1979


I am generally interested in evolutionarily based questions concerning various aspects of flowering plant reproduction from both ecological and genetic perspectives. At a more general level, my research focuses on understanding selective forces in natural populations and the extent to which adaptation is slowed or prevented by genetic constraints.

Past research includes: (1) an investigation of the forces that select for unisexuality rather than hermaphroditism, and how this affects other plant traits, (2) the evolution of sexual dimorphism given underlying genetic correlations, (3) pollen competition, (4) how flower size and number can affect plant fitness, (5) inbreeding and inbreeding depression, and (6) a multitude of questions on gynodioecious species, including the maintenance of females and the cost of restoration.

My current research revolves around the dioecious plant species Silene latifolia. It’s basically a look at how selection can drive sexual dimorphism and how genetic correlations can constrain adaptive evolution. My collaborators and I are taking a variety of approaches including: artificial selection to change the means of traits as well as the genetic correlations between traits, quantitative-genetic breeding designs, experimental arrays planted in the field, QTL analysis, and among-population studies involving both work in natural populations and the greenhouse. I am also interested in how genetic diversity shapes the spread of infectious disease.

Students in my lab don’t necessarily work on my system. In fact, most of them work on species and questions that are related, but separate from my own. For example, my past students have worked on gynodioecious and dioecious species, inbreeding depression, adaptive phenotypic plasticity, pollen competition, and the maintenance of flower color polymorphism.