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University of Colorado Denver College of Liberal Arts and Sciences

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Faculty Staff Directory

Alan Vajda, Ph.D.

Dr. Alan Vajda

Email:  Alan Vajda

Office Location:  SI 4104

Phone:  (303) 556-6765

Fax:  (303) 556-4352

2015 Spring Semester Office Hours:


Areas of Expertise:

Endocrine Disruption
Environmental Toxicology
Ecological Developmental Biology

​Education & Degrees

Ph.D. Environmental Endocrinology, University of Colorado at Boulder, CO

M.A. Environmental Toxicology, University of Colorado at Boulder, CO

B.A. Biology; Science, Technology, and Society, Pomona College, CA


The focus of our laboratory is on the emerging eco-human health issue of endocrine-active  chemicals in our environment.

Studies include: neural mechanisms underlying reproductive disruption by estrogenic mixtures, ecosystem responses to major engineering upgrades, and the role of water management decisions in mitigating adverse impacts of environmental chemicals on the health of humans and wildlife.

​Select Publications

Vajda, A.M., Barber, L.B., Gray, J.L., Bolden, A.M., Lopez, E.M., Schoenfuss, H.L., Norris, D.O. (2011) Demasculinization of male fish exposed to estrogenic wastewater effluent. Aquat. Toxicol.


McGree, M., D.L. Winkleman, N.K.M. Vieira, Vajda, A.M.  2010.  Reproductive failure of the red shiner (Cyprinella lutrensis) after exposure to an exogenous estrogen. Can. J. Fish. Aquat. Sci. 67. 1730-1743.


Vajda, A.M. and Norris D.O. 2010. Endocrine disruption in fishes. In D.O. Norris and K. Lopez, eds. Reproductive Endocrinology of Vertebrates. Oxford University Press, New York.


Schultz, M.M., Furlong, E.T., Kolpin, D.W., Werner, S.L., Schoenfuss, H.L., Barber, L.B., Blazer, V.S., Norris, D.O., Vajda, A.M. 2010. Antidepressant pharmaceuticals in two U.S. effluent-impacted streams: occurrence and fate in water and sediment, and selective uptake in fish neural tissue. Environ. Sci. Technol. 44(6):1918–1925.


Painter, M.R., M.A. Buerkley, M.L. Julius, A.M. Vajda, D.O. Norris, L.B. Barber, E.T. Furlong, M.M. Schultz, H.L. Schoenfuss. 2009. Antidepressents adversely effect predator avoidance behavior of larval fish. Environ. Toxicol. Chem. Dec; 28(12):2677-84.


McGee, M.R., M.L. Julius, A.M. Vajda, D.O. Norris, L.B. Barber, H.L. Schoenfuss. 2009. Predator avoidance performance of larval fathead minnows (Pimephales promelas) following short-term exposure to estrogen mixtures.  Aquat. Toxicol. 91: 355–361.


Brinkman, S.G., J.D. Woodling, D.O. Norris, A.M Vajda. 2008. Chronic toxicity of ammonia to early life stage rainbow trout (Oncorhynchus mykiss) Trans. Am. Fish. Soc. 138: 433-440.


Vajda, A.M., J.L. Gray, L.B Barber, E.M. Lopez, J.D. Woodling, Norris, D.O. 2008. Reproductive disruption in fish downstream from an estrogenic wastewater effluent. Environ. Sci. Technol. 42: 3407-3414.

Norris, D.O. and Vajda, A.M. 2007. Endocrine active chemicals (EACs) in wastewater: Effects on health of wildlife and humans. Impact 9: 15-16.


Vajda, A.M. and D.O. Norris. 2006. Endocrine Active Phytochemicals: Environmental signaling context and mechanisms.  In: D.O. Norris and J.A. Carr, eds. Endocrine Disruption:  The biological basis for health effects in wildlife and humans. Oxford University Press, New York. pp. 390-423.


Woodling, J.D., E.M. Lopez, T. Maldonado, D.O. Norris, and A.M. Vajda.  2006. Intersex and other reproductive disruption of fish in wastewater effluent dominated Colorado streams.  Comp. Biochem. Physiol. C. Toxicol. Pharmacol.  144(1): 10-15.


Vajda, A.M. and D.O. Norris. 2005. Effects of steroids and dioxin (2,3,7,8-TCDD) on the developing wolffian ducts of the tiger salamander (Ambystoma tigrinum). Gen. Comp. Endocrinol. 141(1):1-11.


Courses Taught​

BIOL 3225 - Human Physiology

BIOL 4460/5460 - Environmental Toxicology