Local trends in abundance of migratory bats across 20 years

Dana M. Green, Liam P. Mcguire, Mark C. Vanderwel, Craig K.R. Willis, Matthew J. Noakes, Shelby J. Bohn, Eric N. Green, R. Mark Brigham

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Hoary bats (Lasiurus cinereus) and silver-haired bats (Lasionycteris noctivagans) are species of conservation concern because of the documented annual mortality that occurs at wind energy facilities. Several recent studies have predicted continental-scale declines of hoary bat populations due to interactions with wind turbines. We predicted a decrease in captures at a summer site over 20 years where researchers have captured bats using generally consistent methods. We developed a hierarchical Bayesian model to estimate the relative change in the expected number of captures while controlling for time of year, temperature, and netting effort. We found no decrease in the number of captures for either species. We suggest that the lack of decrease observed at our study site may be a result of compensatory immigration, despite potential broader-scale population declines.

Original languageEnglish
Pages (from-to)1542-1547
Number of pages6
JournalJournal of Mammalogy
Issue number6
StatePublished - Dec 1 2020


  • Lasionycteris noctivagans
  • Lasiurus cinereus
  • compensatory immigration
  • conservation
  • migration
  • wind energy


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