Although humans do not possess the ability to perceive these sounds, technology has allowed us to develop detectors that specialize in capturing high frequency bands.
Echolocation monitoring is an indirect form of bat surveying; thus allowing a greater ability to assess species presence and relative behavior. Acoustic detectors consist of mobile hand-held units and secured units to attain various monitoring objectives. The Titley Anabat Walkabout, a hand-held unit, allows for ease in portability and provides immediate visual representation of recorded vocalizations. Our project team members have documented the Walkabout having an asymmetrical detection range upwards of ~28m in front of the microphone. Where as the Wildlife Acoustics SM3 is a robust instrument that can be deployed at the surveying site for long-term monitoring and data capture. The team found uniform detection ability using the omnidirectional microphone upwards of ~37m from the detector.
Isobar maps are a great method for visually representing the detection range and ability of each unit. Further study will be required on the Roost Logger’s performance used in cave deployments.
Data synthesis compliments of V. Caron, K. Hartog, S. MacKay, K. Sargeant, C. Walker and, B. Whiteman