Tracy Langkilde

Professor of Biology; Dean of the Eberly College of Science

Tracy Langkilde

Research Summary

The interface of ecology and evolution to understand how an organism's traits are matched to its environment and responds to novel selective pressures imposed by global environmental change, and the consequences of this adaptation.

Huck Affiliations


Publication Tags

Lizards Lizard Glucocorticoids Corticosterone Fire Ants Ant Sceloporus Undulatus Temperature Population Fences Reptiles Formicidae Ants Learning Solenopsis Invicta History Exposure Geographical Variation Fitness Hormones Pregnancy Breeding Vertebrates Physiological Stress Invasive Species

Most Recent Papers

Obtaining plasma to measure baseline corticosterone concentrations in reptiles

Catherine Tylan, Kiara Camacho, Susannah French, Sean P. Graham, Mark W. Herr, Jermayne Jones, Gail L. McCormick, Melissa A. O'Brien, Jennifer B. Tennessen, Christopher J. Thawley, Alison Webb, Tracy Langkilde, 2020, General and Comparative Endocrinology

Glucocorticoids do not influence a secondary sexual trait or its behavioral expression in eastern fence lizards

K. J. MacLeod, G. L. McCormick, T. Langkilde, 2019, Scientific reports

Contrasting Responses of Lizards to Divergent Ecological Stressors across Biological Levels of Organization

Rory S. Telemeco, Dasia Y. Simpson, Catherine Tylan, Tracy Langkilde, Tonia S. Schwartz, 2019, Integrative and comparative biology on p. 292-305

Gestation alters the gut microbiota of an oviparous lizard

Brian K. Trevelline, Kirsty J. MacLeod, Tracy Lee Langkilde, Kevin D. Kohl, 2019, FEMS microbiology ecology

Aversion learning in response to an invasive venomous prey depends on stimulus strength

Cameron P. Venable, Thomas Adams, Tracy Lee Langkilde, 2019, Biological Invasions on p. 1973-1980

Fitness costs of mating with preferred females in a scramble mating system

Lindsey Swierk, Tracy Lee Langkilde, 2019, Behavioral Ecology on p. 658-665

Tree selection is linked to locomotor performance and associated noise production in a lizard

Kirsty J. MacLeod, Nicole A. Freidenfelds, Gavin M. Leighton, Tracy Langkilde, 2019, Journal of Zoology on p. 195-202

Population history with invasive predators predicts innate immune function response to early-life glucocorticoid exposure in lizards

Gail L. McCormick, Travis R. Robbins, Sonia A. Cavigelli, Tracy Langkilde, 2019, Journal of Experimental Biology

Presence of an invasive species reverses latitudinal clines of multiple traits in a native species

Christopher J. Thawley, Mark Goldy-Brown, Gail L. McCormick, Sean P. Graham, Tracy Langkilde, 2019, Global Change Biology on p. 620-628

Eastern fence lizards (Sceloporus undulatus) display an ontogenetic shift in relative consumption of native and invasive prey

Cameron P. Venable, Tracy Langkilde, 2019, Canadian journal of zoology on p. 419-423

Most-Cited Papers

Traffic noise causes physiological stress and impairs breeding migration behaviour in frogs

Jennifer B. Tennessen, Susan E. Parks, Tracy Langkilde, 2014, Conservation Physiology

The physiological basis of geographic variation in rates of embryonic development within a widespread lizard species

Wei Guo Du, Daniel A. Warner, Tracy Langkilde, Travis Robbins, Richard Shine, 2010, American Naturalist on p. 522-528

The role of behaviour in the establishment of novel traits

Marlene Zuk, Elizabeth Bastiaans, Tracy Lee Langkilde, Elizabeth Swanger, 2014, Animal Behaviour on p. 333-344

Invader danger

Whitney P. Trompeter, Tracy Lee Langkilde, 2011, Hormones and Behavior on p. 152-158

The impacts of invaders

Sean P. Graham, Nicole A. Freidenfelds, Gail L. McCormick, Tracy Lee Langkilde, 2012, General and Comparative Endocrinology on p. 400-408

Consequences of envenomation

Tracy Lee Langkilde, Nicole A. Freidenfelds, 2010, Wildlife Research on p. 566-573

Hot boys are blue

Tracy Lee Langkilde, Katherine E. Boronow, 2012, Journal of Herpetology on p. 461-465

Evading invaders

N. A. Freidenfelds, T. R. Robbins, Tracy Lee Langkilde, 2012, Behavioral Ecology on p. 659-664

Latitudinal and seasonal variation in reproductive effort of the eastern fence lizard (Sceloporus undulatus)

Weiguo Du, Travis R. Robbins, Daniel A. Warner, Tracy Langkilde, Richard Shine, 2014, Integrative zoology on p. 360-371

Does environmental enrichment really matter? A case study using the eastern fence lizard, Sceloporus undulatus

Renee Louise Rosier, Tracy Lee Langkilde, 2011, Applied Animal Behaviour Science on p. 71-76

News Articles Featuring Tracy Langkilde

Tracy Langkilde Named New Penn State Eberly College of Science Dean

Tracy Langkilde will become the dean of Penn State’s Eberly College of Science, effective October 1. She will replace Douglas Cavener, who stepped down in June to continue teaching and researching full-time.

Sunnier but riskier

Conservation efforts that open up the canopy of overgrown habitat for threatened timber rattlesnakes — whose venom is used in anticoagulants and other medical treatments — are beneficial to snakes but could come at a cost, according to a new study by researchers at Penn State and the University of Scranton.

Biology professor, department head recognized for study of amphibians, reptiles

Professor of Biology Tracy Langkilde has been named Distinguished Herpetologist for her contributions to the field by the Herpetologists' League, an international organization of people devoted to studying the biology of amphibians and reptiles.

Research shows frogs can adapt to traffic noise

Frogs don’t like living near noisy highways any better than people do, but new research suggests that frogs, like hardened city-dwellers, can learn to adapt to the constant din of rumbling trucks, rolling tires and honking horns.

Penn State Researchers Discover Lizards Probably Handle Sex And Stress Better Than People

A new study by Penn State researchers shows that stress doesn’t affect the sexiest features of male eastern fence lizards, definitively proving that lizards have their shit together way more than humans do.