Eastern Box Turtle growth is influenced by environmental conditions which in turn can be influenced by vegetative structure. Removal of Autumn Olive and Russian Olive at a site in Illinois occurred during a 16 year mark-recapture study allowing us to analyze impacts of removal on the growth of turtles. The data showed that removing the invasive plants may not negatively impact the growth of the turtles and that growth is variable by individual. This is attributed to reptile growth being influenced by more than just environmental conditions, including genetics.
This course is designed for students considering careers or graduate work studying wild amphibian and reptile populations. We will introduce students to techniques used in monitoring and research of amphibians and reptiles including methods for sampling, capturing, measuring, and marking herpetological populations and communities.
We will focus on the types of data often collected and basic statistical analyses used. The course will be designed around brief lectures followed by field trips to study sites where students will get hands-on experience with field techniques, which include methods to determine distribution and abundance; marking and measuring; movement patterns and home range size. The course will culminate in a three-day field trip to southern Illinois where students will get to employ many of the techniques they have learned in the class.
Champaign, IL – Protecting and restoring habitats are the most important steps that can be undertaken to protect turtle populations into the future according to a pair of recent papers analyzing 3 decades of data.
The Spotted Turtle, Clemmys guttata, is a small semi-aquatic turtle that inhabits sedge meadow, cattail marsh, wet-mesic prairie, and dolomite prairie in Illinois. It is protected as an endangered species in Illinois, which is at the western edge of its range. The two known populations in Illinois have been the focus of mark-recapture studies since 1988.
Recent analysis found that Spotted Turtle populations are limited by the amount of available habitat, suggesting that management efforts should focus on increasing suitable habitat. Control of cattails (Typha sp.) and restoration of sedges would increase the amount of available habitat.
Adults have a higher survival rate than younger turtles. Predators including raccoons and muskrats can eradicate eggs and juvenile turtles. While caging nests and headstarting juveniles will help the younger turtles, controlling predator populations could benefit all age classes.
Environmental DNA (eDNA) is an emerging tool used to detect rare and difficult to detect species. A recent study by INHS PACE Lab herpetologists used radio telemetry to evaluate and improve the efficiency of this technique.
As part of a species reintroduction program, hatchling Alligator Snapping Turtles reared in captivity were tracked using radio telemetry to assess their survival. This work provided an ideal system for evaluating the efficacy and limitations of using eDNA to detect a bottom dwelling riverine turtle. At each radio location, water samples were collected as well as upstream and downstream of the turtle.
The researchers found that eDNA can be used to detect a benthic turtle species but that detection can be diminished by UV exposure from open canopy. This study shows the importance of continuing to use traditional methods such as radio telemetry to better understand the dynamics of eDNA in the environment.
Members of the PaCE Lab exhibited in Conservation World at the 2019 Illinois State Fair, providing information and education to over 500 visitors. In addition to displays about the research being done by the group, visitors were able to try their hand at using actual field equipment used by scientists in their daily work.
The Illinois Bat Conservation Program had a mist net deployed where visitors could untangle, identify, and measure bats, all while wearing leather gloves.
The Amphibian and Reptile Conservation group had snake tongs, hooks, calipers, and radio telemetry equipment available for visitors to try to wrangle snakes into a snake bag, measure turtles, or track a hidden turtle.
Other activities included Build-a-Bug, where people can assemble the arthropod of their dreams (or nightmares) from a variety of general and specialized appendages, Wheel of Migration, about the risks migratory birds face, and locating PIT-tagged animals.
A new paper by INHS PACE Lab herpetologists examined the movement of the state listed Smooth Softshell Turtle, Apalone mutica, a riverine species. Spatial ecological information is necessary to guide the conservation efforts of river turtles. Turtles were radio tracked and found to move on average 142 m per day, but moved more when water was high or streams were larger. In most situations, females moved greater distances than males. This work will guide future studies of riverine species.