Trade-offs in Designing a Participatory Acoustic Study of Bats: Comparison of User Engagement and Data Quality between Two Ultrasonic Detectors

Anya N. Metcalfe^1,*, Theodore J. Weller², Carol A. Fritzinger¹, Brandon P. Holton³, and Theodore A. Kennedy¹

¹US Geological Survey, Southwest Biological Science Center, Grand Canyon Monitoring and Research Center, Flagstaff, AZ 86001. ²USDA Forest Service, Pacific Southwest Research Station, Arcata, CA 93710. ³US National Park Service, Grand Canyon National Park, Grand Canyon, AZ 86023.^*Corresponding author.

Journal of North American Bat Research, Special Issue 1 (2025):89–99

Abstract
Technology for the acoustic detection of animals has advanced rapidly over the past few decades. Due to ease of use, consistency, and safety, acoustic methods are particularly useful for science applications that engage the public. In this study, we evaluated the technological and educational trade-offs between 2 acoustic bat detectors in a participatory science application along the Colorado River in the Grand Canyon, Arizona. Both devices were deployed simultaneously by commercial river guides in parallel with sampling insect prey for 1 h at dusk on 48 dates between April and October 2022. The detector with higher data quality capabilities recorded more bats overall (a mean of 231 more passes per hour) and more species (19 species, including 4 not detected by the lower quality detector). However, data from both detectors showed a decrease in total bat activity from spring to fall, despite the differences in recording capabilities. We conclude that detector quality matters, but user engagement is important when designing participatory research.

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