Snakes in Central Illinois

snake on log

PACE Lab leader Mike Dreslik was interviewed by the News Gazette to answer a reader’s question: “After reading the article about Snake Road in southern Illinois, I started wondering what species of snakes are found here in central Illinois? Have any new species been found over the last few years, with the milder winters?”

In addition to listing off species found in the area, Dreslik said, “Although it seems the winters are getting warmer, especially as spring approaches, we have not seen any new species of snakes moving into Illinois, we just see snakes emerging from their winter slumber sooner.”

Read the complete response at the News Gazette

Licensed to burn

people and burnt field
Field before and after prescribed burn

Travel around Illinois in the spring and you are likely to see fields on fire. Many of these are intentionally set to aid land managers in reaching ecological goals. Prescribed burns can remove woody vegetation from prairies, remove invasive species, cycle nutrients back into the soil, and open up the canopy. These prescribed burns require much preparation and training.

Last week a group of staff from the Population and Community Ecology Lab (PACE lab) became certified to participate in prescribed burns.

people and burnt field
PACE Lab members after burn

Before being allowed to light our first fire, we had to complete online courses through the National Wildfire Coordinating Group to learn how to put out a wildfire. Through the courses – Human Factors in the Wildland Fire Service, Introduction to Wildland Fire Behavior, and Firefighter Training – we learned how to assess fire and weather conditions, control a fire, think critically in stressful situations, and survive when things go wrong.

Our final day of coursework involved classroom activities, learning about different prescribed burn techniques, trying out personal protective equipment (PPE), practicing deployment of a fire shelter, and finally, starting a fire.

The U of I Committee on Natural Areas (CNA) had a small plot of land that needed to be burned north of campus. When we arrived, we found clear blue skies, light wind, and a piece of grassland bordered by woodlands full of singing Chorus Frogs to the north, privately owned bean fields to the east, and a long-term research project to the south. Jamie and Nate from the CNA had mowed down a 10ft wide swath of grass between the grassland and research plot. The woodland and bean field were separated from the prairie by a gravel and dirt path. This would be our control line.

Assessing the wind direction (from the NW), and the location of the surrounding areas we wanted to leave unburnt, we decided to start our backfire on the SE side of the prairie. By starting against the wind, we could slowly create a burned area bordering the remaining grassland creating an area that fire could not cross back over. If we started on the NW side, the wind would sweep the fire quickly across the entire field and likely into the areas we didn’t want to burn.

Wearing hardhats, goggles, and Nomex suits, we armed ourselves with backpack waterpumps, drip torches, fire rakes, fire flappers, and McLeods. We separated into two teams, one to burn the south side (Team 1) and one to burn the east side (Team 2). We quickly learned that things don’t always go as planned. Team 1’s drip torch wouldn’t drip, making it impossible to start fire. Team 2 had less trouble spreading fire and things got hot fast!

Once Team 2 got things going, it became clear that we needed to improve the southern control line, and all rakes and McLeods got to work trenching a line ahead of the drip torch. Those with flappers followed behind to snuff out spot fires and ensure any smoldering along the edges was put out.

As the fire engulfed more of the prairie, the flames and smoke intensified, the fire generated its own wind. Thick black smoke billowed above us and fire whirls spun flames and ash like tornadoes. When we reached the western edge of the grassland, we had burned a 20 foot wide strip in addition to the 10 foot control line between the rest of the grass and research plot. This tediously created area devoid of fuels would keep the fire from being able to jump to the research plot or the bean field, while the wind would keep the fire out of the woodland. We could now safely start a headfire that the wind could carry across the remaining grasses.

Once the area had been cleared, we walked the perimeter one last time to make sure there was no smoldering and nothing left behind. The only thing left unblackened were the bones of a deer that had been been picked clean by scavengers long before our fire.

Our final test was our After Action Review where we discussed what happened, what was good, what was bad, and what we learned.

For many, this was the first time that close to a fire and the heat and intensity was greater than anticipated, but all look forward to future opportunities to use this powerful tool.


photos by T Hohoff, M Dreslik, and J Mui

Rising temperatures could benefit the Snapping Turtle

Rising temperatures could benefit the Common Snapping Turtle.

CHAMPAIGN, ILL. — A recently published study of snapping turtle nests at Gimlet Lake in Garden County Nebraska from 1990 – 2015 found that warmer fall temperatures positively correlate to larger eggs and larger numbers of eggs, while warmer spring temperatures are negatively correlated with egg size and number.

Nesting females were observed and after depositing eggs, captured, measured, marked, and released. The nests were excavated and eggs were counted and measured before being reburied.

Maximum egg size is limited in many turtle species by the size of the female, specifically the pelvic aperture, thus surplus resources are used to develop a greater number of eggs rather than larger eggs. Although this limitation is present in many species of turtles, it was clear a different pattern existed within Snapping Turtles (Chelydra serpentina). Large adult snapping turtles are not restricted in the size egg they can produce and in warmer years, produced larger eggs but the same number. Small adult snapping turtles, on the other hand, did not increase the size of their eggs, but produced larger clutches in warmer years.

Most temperate zone turtles begin developing their embryos in the fall, suspend development over the winter, and complete development in the spring. Snapping turtles complete the majority of their development in the fall, which may reduce the impact of winter and spring climate conditions.

Forming the eggs in the fall may enable snapping turtles to lay their eggs earlier and provide their young an advantage over other species. Herpetologist Michael Dreslik said,“Generalists like the Snapping Turtle tend to be more adaptable. The added benefit from warmer temperatures could allow Snapping Turtles to gather more resources for larger eggs or larger clutches.”

The mechanisms by which warmer temperatures influence egg and clutch size are unknown. Turtles are ectotherms, thus metabolism and physiology are impacted by environmental conditions.

“Warmer temperatures increase metabolism, but could result in greater food availability and more efficient processing of the food. Warmer temperatures could also affect the physiology of embryo development,” said lead author Ashley Hedrick. “Alternatively, in the spring, increased metabolism before food is readily available may require females to divert energy from egg development.”

While rising temperatures are generally considered problematic for most species, they could play in favor of the Snapping Turtle.

The paper “The Effects of Climate on Annual Variation in Reproductive Output in Snapping Turtles (Chelydra serpentina).” is available online from the Canadian Journal of Zoology.

Corresponding author: J.B. Iverson email:
To reach Ashley Hedrick, email
To reach Michael Dreslik, email
Photo by Jason P. Ross



UBAP staff present at Turtle Survival Alliance

UBAP staff Michael J. Dreslik and Jason P. Ross recently presented at the 2017 Symposium on the Conservation and Biology of Tortoises and Freshwater Turtles. The meeting was held in Charleston, South Carolina from August 6th – 9th and has international attendance. At the meeting, they presented a poster on the effectiveness of passage gates along the Asian Carp Barrier and a co-authored oral presentation with a collaborator on the reproduction of Common Snapping Turtles which is in press in the Canadian Journal of Zoology.


Hedrick, A. R., H. M. Klondaris, L. C. Corichi, M. J. Dreslik. J. B. Iverson. The effects of climate on annual variation in reproductive output in Snapping Turtles (Chelydra serpentina). Oral Presentation.


Ross, J. P., C. Y. Feng, and M. J. Dreslik. Evaluating turtle passage gates using remote camera traps and visual encounter surveys. Poster Presentation. View Poster

Funding received to survey the Alligator Snapping Turtle

ARC Lab members Ethan J. Kessler and Michael J. Dreslik received funding from The Nature Conservancy, Indiana to conduct surveying for the Alligator Snapping Turtle (Macrochelys teminckii). The surveys will be a combined effort of trapping and eDNA sampling in the Patoka and White River watersheds. The project also includes some proof-of-concept work for eDNA work at the southern Illinois release site. Survey work will commence this summer through fall.

UBAP staff present at Biology of the Snakes Conference

Members of the Urban Biotic Assessment Program, Michael J. Dreslik and Sarah J. Baker, recently attended and presented at the Biology of the Snakes 2017 Conference in Rodeo New Mexico. They gave two oral and two poster presentations.

Oral Presentations
Dreslik, M. J., C. E. Petersen, S. M. Goetz, J. D. Kleopfer, and A. H. Savitzky. Spatial ecology of the Timber Rattlesnake (Crotalus horridus) from the mid-Atlantic coastal plain.

Dreslik, M. J., J. A. Crawford, S. J. Baker, W. E. Peterman, and C. A. Phillips. Detection probability and capture yield of an imperiled species.


Poster Presentations
Baker, S. J., M. J. Dreslik, C. A. Phillips, and M. C. Allender. Impact of snake fungal disease on population viability.

Dreslik, M. J., C. E. Petersen, S. M. Goetz, J. D. Kleopfer, and A. H. Savitzky. Factors affecting the movements of Timber Rattlesnakes (Crotalus horridus) from the mid-Atlantic coastal plain. View Poster

UBAP staff present at the Joint Meeting of Ichtyhologists and Herpetologist

Members of the Illinois Natural History Survey’s Urban Biotic Assessment Program and Herpetology Lab recently attended the Joint Meeting of American Society of Ichthyologists and Herpetologists, Society for the Study of Amphibians and Reptiles, and Herpetologists’ League in Austin, Texas from 12 July to 16 July 2017. They presented on a variety of topics from rattlesnakes to darters and from wildlife disease to community changes. The combined topics for presentations and posters were:



Baker, S. J., M. J. Dreslik, C. A. Phillips, and M. C. Allender. Impact of snake fungal disease on population viability.

Dreslik, M. J., C. E. Petersen, S. M. Goetz, J. D. Kleopfer, and A. H. Savitzky. Factors affecting the movements of Timber Rattlesnakes (Crotalus horridus) from the mid-Atlantic coastal plain.

Low, K. M., M. C. Allender, C. A. Phillips, and S. J. Kimble. A ranavirus-associated mass mortality event in an Illinois amphibian community.

Ross, J. P., C. Y. Feng, and M. J. Dreslik. Evaluating reptile and amphibian passage gates using remote camera traps.

Sites, A. J., J. L. Sherwood, J. S. Tiemann, and M. J. Dreslik. Assessing the distribution of Iowa Darters (Etheostoma exile) in streams of northern Illinois.



Baker, S. J., and M. C. Allender. Comparison of testing methods for snake fungal disease.

Dreslik, M. J., C. E. Petersen, S. M. Goetz, J. D. Kleopfer, and A. H. Savitzky. Spatial ecology of the Timber Rattlesnake (Crotalus horridus) from the mid-Atlantic coastal plain. View Poster

Sherwood, J. L., and J. A. Stein. Habitat and fish community changes in Champaign County, IL over the past 100 years.

Experts hope to increase population of endangered turtles in Lake County

Dreslik said the biggest challenge Blanding’s turtle conservation will have in the Chicago area is the landscape.

“It’s highly fragmented by roads, by industrial areas, by urbanization,” he said.

That’s one reason Chicago Wilderness is partnering with the Illinois Department of Natural Resources to create a statewide Blanding’s turtle recovery plan, he said.

“We’ve done radio telemetry, tracking turtles at a very large site at Goose Lake Prairie (in Grundy County),” Dreslik said. “Those turtles were capable of moving many kilometers between wetlands. “

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