Welcome to the Department of Biology

Department of Biology at Illinois State University
Department of Biology
group photo

For information about our faculty visit the "Research and Facilities" page (click here or the above tab). Choose a topic which will give you the list of faculty and links to their website. For staff contacts see "About Us" (click here or the above tab).

Dr. Ryan Paitz

Assistant Professor of Endocrinology
  • I am a comparative physiologist interested in how vertebrate embryos regulate their exposure to maternal steroids and environmental chemicals.
  • BSC 499.Sec 027 Independent Research For The Master's Thesis
  • BSC 290.Sec 050 Research In Biological Sciences
  • Endocrinology, Comparative Physiology, Developmental Biology, Embryology
  • Embryonic development, steroid metabolism, maternal effects, steroids, endocrine disruption
  • Ph D Biological Sciences - 2010
  • Illinois State University
  • Normal, IL
  • BS Genetics - 2003
  • Iowa State University
  • Ames, IA
  • Bowden, R. M. and R. T. Paitz. 2018. Temperature fluctuations and maternal estrogens as critical factors for understanding temperature-dependent sex determination in nature. Journal of Experimental Zoology. In press.
  • Merrill, L., Chiavacci, S. J., Paitz, R. T., & Benson, T. J. (2017). Rates of parasitism, but not allocation of egg resources, vary among and within hosts of a generalist avian brood parasite. Oecologia, 1-12.
  • Carter, A. W., Bowden, R. M., & Paitz, R. T. (2017). Seasonal shifts in sex ratios are mediated by maternal effects and fluctuating incubation temperatures. Functional Ecology, 31(4), 876-884.
  • Bensky, M. K., Paitz, R., Pereira, L., & Bell, A. M. (2017). Testing the predictions of coping styles theory in threespined sticklebacks. Behavioural processes, 136, 1-10.
  • Paitz, R. T., Duffield, K. R., & Bowden, R. M. (2017). Characterizing the distribution of steroid sulfatase during embryonic development: when and where might metabolites of maternal steroids be reactivated?. Journal of Experimental Biology, 220(24), 4567-4570.
  • Carter, A. W., R. T. Paitz, K. E. McGhee, and R. M. Bowden. 2016. Turtle hatchlings show behavioral types that are robust to developmental manipulations. Physiology & Behavior 155:46-55.
  • Holgersson, M. C. N., W. A. Nichols, R. T. Paitz, and R. M. Bowden. 2016. How important is the eggshell as a source for initial acquisition of Salmonella in hatchling turtles? Journal of Experimental Zoology Part A: Ecological Genetics and Physiology 325A:142-148.
  • Paitz, R. T. and R. M. Bowden. 2015. The in ovo conversion of oestrone to oestrone sulfate is rapid and subject to inhibition by Bisphenol A. Biology Letters 11:20140946.