Tracy Langkilde

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IEE Research Themes
Executive Committee Member
Affiliate Researcher
Titles and Affiliations
Verne M. Willaman Dean, Eberly College of Science
Professor, Biology

Research Summary

My research is broadly focused on understanding the processes that structure communities and permit the coexistence of the component species. I am particularly interested in how the nature of interactions between species can shift over time in response to changes in the environment and corresponding selection pressures. The introduction of invasive species is one such perturbation that is becoming increasingly common. My current research examines how invasive fire ants impact the behavior, morphology, and physiology of native lizards across multiple time scales, and the consequences of evolutionary response of native species to these novel selective pressures. This research has both basic and applied relevance, allowing me to address important ecological questions about the evolutionary processes affecting the composition and dynamics of natural communities, while also providing valuable information on the long-term impact of invasive species. My work is mostly field based, and incorporates aspects of population, community, behavioral, and evolutionary ecology. I employ experimental and comparative approaches and molecular techniques to test key hypotheses with two main foci: 1) the evolution of survival strategies and 2) the ecological and evolutionary consequences of stress.

Research Keywords

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Recent Publications

Honest signals and sexual conflict: Female lizards carry undesirable indicators of quality

Assis, B. A., Avery, J. D., Tylan, C., Engler, H. I., Earley, R. L. & Langkilde, T., Jun 2021, In: Ecology and Evolution. 11, 12, p. 7647-7659 13 p.

Research output: Contribution to journalArticlepeer-review

Elevated glucocorticoids during gestation suggest sex-specific effects on offspring telomere lengths in a wild lizard

Ensminger, D. C., Siegel, S. R., Owen, D. A. S., Sheriff, M. J. & Langkilde, T., Jul 2021, In: Comparative Biochemistry and Physiology -Part A : Molecular and Integrative Physiology. 257, 110971.

Research output: Contribution to journalArticlepeer-review

Plastic sexual ornaments: Assessing temperature effects on color metrics in a color-changing reptile

Assis, B. A., Jarrett, B., Koscky, G., Langkilde, T. L. & Avery, J., 2020, In: PLoS One. 15, 5

Research output: Contribution to journalArticlepeer-review

The influence of hunting pressure and ecological factors on fecal glucocorticoid metabolites in wild elk

Ensminger, D. C., Pritchard, C., Langkilde, T., Gingery, T., Banfield, J. E. & Walter, W. D., Dec 1 2020, In: Wildlife Biology. 2020, 2, 00683.

Research output: Contribution to journalArticlepeer-review

Trade-off between Thermal Quality and Predation Risk at Timber Rattlesnake Gestation Sites

Herr, M. W., Avery, J. D., Langkilde, T. & Howey, C. A. F., Jun 1 2020, In: Journal of Herpetology. 54, 2, p. 196-205 10 p.

Research output: Contribution to journalArticlepeer-review

Trade-off Between Thermal Quality and Predation Risk at Timber Rattlesnake Gestation Sites

Herr, M. W., Avery, J., Langkilde, T. L. & Howey, C., 2020, In: Journal of Herpetology. 54, 2, p. 196 205 p.

Research output: Contribution to journalArticlepeer-review

Glucocorticoid and triiodothyronine concentrations do not correlate with behavior in vicuñas (Vicugna vicugna)

Pritchard, C. E., Palme, R. & Langkilde, T., Jan 15 2020, In: General and Comparative Endocrinology. 286, 113299.

Research output: Contribution to journalReview articlepeer-review

Effects of temperature on plasma corticosterone in a native lizard

Racic, A., Tylan, C. & Langkilde, T., Dec 1 2020, In: Scientific reports. 10, 1, 16315.

Research output: Contribution to journalArticlepeer-review

Ecoimmune reallocation in a native lizard in response to the presence of invasive, venomous fire ants in their shared environment

Tylan, C., Horvat-Gordon, M., Bartell, P. A. & Langkilde, T., Dec 1 2020, In: Journal of Experimental Zoology Part A: Ecological and Integrative Physiology. 333, 10, p. 792-804 13 p.

Research output: Contribution to journalArticlepeer-review

Obtaining plasma to measure baseline corticosterone concentrations in reptiles: How quick is quick enough?

Tylan, C., Camacho, K., French, S., Graham, S. P., Herr, M. W., Jones, J., McCormick, G. L., O'Brien, M. A., Tennessen, J. B., Thawley, C. J., Webb, A. & Langkilde, T., Feb 1 2020, In: General and Comparative Endocrinology. 287, 113324.

Research output: Contribution to journalArticlepeer-review