Professor of Biology; Dean of the Eberly College of Science
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.
- Ecology Institute
- Center for Infectious Disease Dynamics
- Center for Brain, Behavior, and Cognition
Publication TagsLizards Corticosterone Glucocorticoids Lizard Temperature Sceloporus Undulatus Pregnancy Reptiles Color Fire Ants Plastics Animals Ant Exposure Ants Population Predation Triiodothyronine Breeding Fitness Immunity Predator Predators Effect Hemagglutination
Most Recent Papers
Elevated glucocorticoids during gestation suggest sex-specific effects on offspring telomere lengths in a wild lizard
David C. Ensminger, Sue R. Siegel, Dustin A.S. Owen, Michael J. Sheriff, Tracy Langkilde, 2021, Comparative biochemistry and physiology. Part A, Molecular & integrative physiology
Honest signals and sexual conflict
Braulio A. Assis, Julian D. Avery, Catherine Tylan, Heather I. Engler, Ryan L. Earley, Tracy Langkilde, 2021, Ecology and Evolution on p. 7647-7659
Ecoimmune reallocation in a native lizard in response to the presence of invasive, venomous fire ants in their shared environment
Catherine Tylan, Maria Horvat-Gordon, Paul A. Bartell, Tracy Langkilde, 2020, Journal of Experimental Zoology Part A: Ecological and Integrative Physiology on p. 792-804
Effects of temperature on plasma corticosterone in a native lizard
Andrea Racic, Catherine Tylan, Tracy Langkilde, 2020, Scientific Reports
The influence of hunting pressure and ecological factors on fecal glucocorticoid metabolites in wild elk
David C. Ensminger, Catharine Pritchard, Tracy Langkilde, Tess Gingery, Jeremiah E. Banfield, W. David Walter, 2020, Wildlife Biology
Trade-off between Thermal Quality and Predation Risk at Timber Rattlesnake Gestation Sites
Mark W. Herr, Julian D. Avery, Tracy Langkilde, Christopher A.F. Howey, 2020, Journal of Herpetology on p. 196-205
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
Glucocorticoid and triiodothyronine concentrations do not correlate with behavior in vicuñas (Vicugna vicugna)
Catharine E. Pritchard, Rupert Palme, Tracy Langkilde, 2020, General and Comparative Endocrinology
Plastic sexual ornaments: Assessing temperature effects on color metrics in a color-changing reptile
B. A. Assis, Benjamin Jarrett, Gabe Koscky, Tracy Lee Langkilde, Julian Avery, 2020, PLoS One
History of predator exposure affects cell-mediated immunity in female eastern fence lizards, Sceloporus undulatus (Squamata: Phrynosomatidae)
Kristen Sprayberry, Catherine Tylan, Dustin A.S. Owen, Kirsty J. MacLeod, Michael J. Sheriff, Tracy Langkilde, 2019, Biological Journal of the Linnean Society on p. 944-951
Traffic noise causes physiological stress and impairs breeding migration behaviour in frogs
Jennifer B. Tennessen, Susan E. Parks, Tracy Langkilde, 2014, Conservation Physiology
The role of behaviour in the establishment of novel traits
Marlene Zuk, Elizabeth Bastiaans, Tracy Langkilde, Elizabeth Swanger, 2014, Animal Behaviour on p. 333-344
Whitney P. Trompeter, Tracy Langkilde, 2011, Hormones and Behavior on p. 152-158
The impacts of invaders
Sean P. Graham, Nicole A. Freidenfelds, Gail L. McCormick, Tracy Langkilde, 2012, General and Comparative Endocrinology on p. 400-408
Hot boys are blue
Tracy Langkilde, Katherine E. Boronow, 2012, Journal of Herpetology on p. 461-465
N. A. Freidenfelds, T. R. Robbins, T. Langkilde, 2012, Behavioral Ecology on p. 659-664
How do duration, frequency, and intensity of exogenous CORT elevation affect immune outcomes of stress?
Gail L. McCormick, Katriona Shea, Tracy Langkilde, 2015, General and Comparative Endocrinology on p. 81-87
Female lizards discriminate between potential reproductive partners using multiple male traits when territory cues are absent
Lindsey Swierk, Matthew Ridgway, Tracy Langkilde, 2012, Behavioral Ecology and Sociobiology on p. 1033-1043
Does environmental enrichment really matter? A case study using the eastern fence lizard, Sceloporus undulatus
Renee L. Rosier, Tracy Langkilde, 2011, Applied Animal Behaviour Science on p. 71-76
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
News Articles Featuring Tracy Langkilde
Jun 10, 2021
Snapshot USA: First-ever nationwide mammal survey now published
The results of the first national mammal survey, now publicly available online, provide the framework to answer a variety of questions about wild animal populations and conservation strategies for threatened species. The survey, which involved researchers from across the country including a biologist at Penn State, is made up of data from 1,509 motion-activated camera traps from 110 sites located across all 50 states.
May 14, 2021
Maternal stress during pregnancy may shorten lifespans of male lizard offspring
Mother fence lizards that experience stress during pregnancy give birth to male offspring with shortened telomeres, or bits of non-coding DNA that cap the ends of chromosomes, according to a Penn State-led study.
Aug 25, 2020
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.
Jun 23, 2020
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.
Jul 25, 2019
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.
Jul 23, 2019
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.
Apr 24, 2019
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.
Apr 17, 2019
Research: Features that make lizards appealing to potential mates are resilient to stress
Physical traits and behaviors that make a lizard sexy — features used to attract potential mates and fend off competitors — may be important enough that they do not change in the face of stress. A new study by researchers at Penn State reveals that the blue and black badges on the throats and abdomens of male fence lizards — and signaling behaviors used to show them off — are not affected by low levels of stress-associated hormones, unlike many other traits.
Mar 13, 2019
Ecology Alum Jennifer Tennessen Brings Acoustics to Killer Whale Conservation
Dr. Jennifer Tennessen applies the lessons of her interdisciplinary research at the Huck to her professional work with killer whales in the Pacific Northwest.
Jan 28, 2019