Courses I Teach:
Graduate Excel Biometry – WFSC 670
Graduate Population Genetics – GENE 612
Graduate Behavioral Ecology – WFSC 622
Undergraduate Introduction to Bioenvironmental Sciences – BESC 201

Education:
Ph.D. (Ecology, Evolution & Behavior) Binghamton University (SUNY), 1995
M.A. (Ecology, Evolution & Behavior) Boston University, 1991
Naturalist Ecologist Training Program, University of Michigan, 1990
B.Sc. (Biology) Grand Valley State University, 1987

Research interests:
ecological quantitative genetics; functional ecology; phenotypic plasticity; natural selection;
conservation biology; environmental stochasticity; biomathematical models; development; freshwater ecology

My research concentrates in these areas:
    (1) Evolutionary diversification and phenotypic plasticity in fish body shape
    (2) Inducible defenses in snails with functionally diverse predators
    (3) Theoretical models of evolution in stochastic environments
    (4) Mating behavior of simultaneous hermaphrodites
    (5) Theoretical and geometric morphometrics
    (6) Convergent evolution projects (using fish and Drosophila)
    (7) Evolutionary experiments with microbes, such as Neurospora

Publications:

Tobler M, DeWitt TJ, Schlupp I, García de León FJ, Herrmann R, Feulner PGD, Tiedemann R, Plath M (2008)
Toxic hydrogen sulfid and dark caves: Phenotypic and genetic divergence across two abiotic environmental gradients in Poecilia mexicana.
Evolution 62:2643-2658. [PDF]

Johnson JB, Burt DB, DeWitt TJ (2008)
Form, function, fitness—pathways to survival.
Evolution 62:1243-1251. [PDF] [2008 ASIH Poster]

McEachran JD, DeWitt TJ (2008)
A new livebearing fish, Heterandria tuxtlaensis, from Lake Catemaco, Veracruz, Mexico (Cyprinodontiformes: Poeciliidae).
Zootaxa 1824:45-54. [PDF]

Ruehl CB, DeWitt TJ (2007)
Trophic plastcity and foraging performance in red drum, Sciaenops ocellatus (Linnaeus).
Journal of Experimental Marine Biology & Ecology 349 284–294. [PDF]

Langerhans RB, Chapman LJ, DeWitt TJ (2007)
Multiple phenotypes, multiple environmental gradients: complex phenotype-environment associations in an East African cyprinid.
Journal of Evolutionary Biology 20: 1171–1181. [PDF] [2008 ASIH Poster]

Chapman LJ, DeWitt TJ, Tzaneva V, Paterson J (2007)
Interdemic variation in gill morphology of a eurytopic African cichlid.
Proceedings of the 9th International Symposium: Fish Physiology, Toxicology, and Water Quality.
EPA publication 600R07010: 209-225. [PDF]

Dayton GH, Saenz D, Baum KA, Langerhans RB, DeWitt TJ (2005)
Body shape, burst speed and predator susceptibility of larval anurans.
Oikos 111:582-591. [PDF]

Langerhans RB, Layman CA, DeWitt TJ (2005)
Male genital size reflects a tradeoff between attracting mates and avoiding predators in two livebearing fish species.
Proceedings of the National Academies of Science USA 102: 7618-7623. [PDF]

Ruehl CB, DeWitt TJ (2005)
Trophic plasticity and fine-grained resource variation in populations of western mosquitofish, Gambusia affinis.
Evolutionary Ecology Research 7:801–819 [PDF]

Langerhans RB, Layman CA, Shokrollahi AM, DeWitt TJ (2004)
Predator-driven phenotypic diversification in Gambusia affinis.
Evolution 58: 2305–2318. [PDF]

Langerhans RB, DeWitt TJ (2004)
Shared and unique features of evolutionary diversification.
American Naturalist 164: 335-349. [PDF]

Langerhans RB, Layman CA, Langerhans AK, DeWitt TJ (2003)
Opposite habitat-based divergence in two fishes within a tropical blackwater river.
Biological Journal of the Linnean Society 80: 89-98. [PDF]

DeWitt TJ, Langerhans RB (2003)
Multiple prey traits, multiple predators: keys to understanding complex community dynamics.
Journal of Sea Research 49: 143-155. [PDF]

DeWitt TJ, Sih A, Hucko JA (1999)
Trait compensation and cospecialization in a freshwater snail: Size, shape and antipredator behaviour.
Animal Behaviour 58: 397-407. [PDF]

DeWitt TJ, Sih A, Wilson DS (1998)
Costs and limits of phenotypic plasticity.
Trends in Ecology & Evolution 13: 77-81. [PDF]

DeWitt TJ, Yoshimura J (1998)
The fitness threshhold model: Random environmental change alters adaptive landscapes.
Evolutionary Ecology 12: 615-626. [PDF]

DeWitt TJ (1997)
Optimizing clutch size in birds. (Correspondence)
Trends in Ecology & Evolution 12: 443. [PDF]

DeWitt TJ (1996)
Gender contests in a simultaneous hermaphrodite snail: A size-advantage model for behaviour.
Animal Behaviour 51: 345-351. [PDF]

DeWitt TJ (1993)
Nest-site preference in male fathead minnows, Pimephales promelas.
Canadian Journal of Zoology 71: 1276-1279.