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Bat Surveys

During the summer of 2016, UW-Green Bay undergraduate student, Jeremiah nocturnal acoustic bat surveys (using an Anabat Walkabout) near the shores of the Lower Green Bay and Fox River Area of Concern (LGBFR AOC), an area that is potentially critical for both migratory and resident bats, in an attempt to better document bat usage and habitats. Results provided baseline information on bat abundance, species richness, and community composition within the LGBFR AOC. Bat sonograms were analyzed using AnalookW and identified by frequency difference. Activity output was standardized by time and summarized based on transect. Bat locations were mapped using ArcMap.

Hanging Bat

A total of 1,981 detections were recorded at 24 sites over a total 67 separate transect efforts. A total of 32 transects were completed on the east shore of Green Bay, 21 on the west shore, and 14 along the Fox River. Bat species recorded include big brown (Eptesicus fuscus), eastern red (Lasiurus borealis), hoary (Lasiurus cinereus), little brown (Myotis lucifugus), northern long-eared (Myotis septentrionalis), eastern pipistrelle (Perimyotis subflavus), and silver-haired (Lasionycteris noctivagans).

For more detailed project results, click here to download Shrovnal’s presentation.

If you plan to use Shrovnal’s presentation, please contact Erin Giese (, Robert Howe (, and Amy Wolf ( to track usage, properly cite Shrovnal’s work, and ask questions if needed.