Climate Science Program

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Fredric J. Janzen

Professor/ CSP Investigator

Janzen Fred

Office: 343 Bessey Hall

Phone: 515-294-4230





Department: Ecology, Evolution, and Organismal Biology

Research Interests:Biotic impacts of climate change, ecological/evolutionary genetics, evolutionary ecology.

Brief description of current research:

Dr. Janzen’s research focuses on studying ecology and evolution with (1) mechanistic work at the molecular and organismal levels, (2) field studies that document the importance of phenotypic variation, and (3) a comparative view of the long-term consequences of this variation. This research approach integrates molecular, genetic, and computational techniques with experimental laboratory and field studies. The externally funded research program explores the impact of environmental and genetic factors in mediating the expression of physiological, behavioral, and life-history traits, particularly (1) the biological significance of diverse sex-determining mechanisms (especially environmental sex determination) and (2) the current and historical genetic structure of populations and species, with an emphasis on elucidating adaptive processes and solving conservation concerns like those induced by ongoing climate change.

Recent publications:

Schwanz, L. E., and F. J. Janzen. 2008. Climate change and temperature-dependent sex determination: can individual plasticity in nesting phenology prevent extreme sex ratios?  Physiological and Biochemical Zoology 81:accepted pending revision.

Willette, D. A. S., J. K. Tucker, and F. J. Janzen. 2005. Linking climate and physiology at the population level for a key life-history stage of turtles. Canadian Journal of Zoology 83:845-850.

Kuo, C.-H., and F. J. Janzen. 2003. BottleSim: a bottleneck simulation program for long-lived species with overlapping generations. Molecular Ecology Notes 3:669-673.

Janzen, F. J. 1994. Climate change and temperature-dependent sex determination in reptiles. Proceedings of the National Academy of Sciences USA 91:7487-7490.