Species-Specific Acoustic Signatures Inside EchoQuilt Surveys

Myotis lucifugus and Myotis septentrionalis echolocate within a few kilohertz of each other, and inside a mixed-species hibernaculum their chirps braid together on the same spectrograms. This post works through how EchoQuilt threads species-specific acoustic signatures — call shape, interval, and wing-beat envelope — into patches that keep species identity across the whole reconstructed quilt.

A mixed hibernaculum in southern Ohio holds Indiana bat (Myotis sodalis) clusters on the east wall and a scatter of NLEB on bedding-plane overhangs 8 meters north. A biologist walking the room in March cannot reliably tell them apart from the floor without a ladder, and the winter acoustic files from the nearest SM4BAT are not an automatic fix. A PLOS ONE review of automated echolocation classifiers reported classifier accuracy varies significantly by genus, with Myotis calls the most frequently confused group. NPS coverage of Niobrara bat acoustic monitoring notes that software IDs by call frequency and shape, but expert review remains necessary for species-level calls.