Journal Article

Individual and Group Variation in Echolocation Calls of Big Brown Bats, <i>Eptesicus fuscus</i> (Chiroptera: Vespertilionidae)

Karry A. Kazial, Stephen C. Burnett and W. Mitchell Masters

in Journal of Mammalogy

Volume 82, issue 2, pages 339-351
Published in print May 2001 | ISSN: 1545-1542
Published online May 2001 | e-ISSN: 0022-2372 | DOI: https://dx.doi.org/10.1093/jmammal/82.2.339
Individual and Group Variation in Echolocation Calls of Big Brown Bats, Eptesicus fuscus (Chiroptera: Vespertilionidae)

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We explored the ability to discriminate between echolocation calls of 20 adult and 20 juvenile big brown bats (Eptesicus fuscus). Variables describing each call were entered into discriminant function analyses (DFAs) to assess the success of call separation by age, sex, and individual. In agreement with earlier findings of age-dependent differences in the echo-location calls of big brown bats, we could discriminate calls by age class (juvenile versus adult) with 75% correct classification by DFA. We were not able to separate calls by sex. for discrimination of individuals, we found 63% correct classification (compared with 2.5% expected by chance alone). Correct classification was significantly higher for adults than for juveniles (74% versus 69%), perhaps indicating that calls become more stable as a bat ages.

Keywords: big brown bats; Chiroptera; echolocation calls; Eptesicus fuscus; Vespertilionidae

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