In general, bats are difficult to study because they are nocturnal, fast fliers, roost in inconspicuous places and can move great distances in short periods of time. As such, lack of information on basic biology and ecology is one of the greatest limitations to conservation of bat species. The Wisconsin DNR Bat Program (WBP) has turned to the WI Citizen-based Monitoring Network for assistance with monitoring bats in the state. Using trained volunteers has allowed the WBP to gather large amounts of data from across Wisconsin.
You can volunteer to monitoring bats in the state! Monitors conducting acoustic and roost surveys across the state for the past twelve years have helped the WBP determine species distribution and relative abundance in Wisconsin.
Acoustic Bat Monitoring
Bats in Wisconsin use echolocation to navigate and hunt. Bat echolocation is in the ultrasonic range which means it is above human hearing. How bats can fly in complete darkness remained a mystery until the 1930s when scientists discovered that bats use echolocation. Special ultrasonic detection equipment was developed and opened a whole new method for studying bats.
To conduct acoustic bat surveys in Wisconsin, volunteers are trained to use handheld ultrasonic detectors, or bat detectors as they are affectionately called. The system consists of a detector that records the ultrasound, a PDA that displays the bat calls on a graph of frequecy over time, and a GPS unit that tracks the route taken and pinpoints each bat call. Data is saved onto the PDA and analyzed in the office. Just like birds, bat species have different calls from each other. By looking at the frequency, shape and other characteristics of calls, the WBP can identify the species of bat that was recorded.
There are three types of acoustic surveys you can do:Contact us to learn how to conduct acoustic bat surveys, view results from past surveys and how to interpret them, and learn more about past efforts with our 2015 Acoustic Bat Monitoring Report.
Already conducting surveys? Login to submit your data!