title: Social calls of flying big brown bats (Eptesicus fuscus).
abstract: Vocalizations serving a variety of social functions have been reported in many bat species (Order Chiroptera). While echolocation by big brown bats (Eptesicus fuscus) has been the subject of extensive study, calls used by this species for communication have received comparatively little research attention. Here, we report on a rich repertoire of vocalizations produced by big brown bats in a large flight room equipped with synchronized high speed stereo video and audio recording equipment. Bats were studied individually and in pairs, while sex, age, and experience with a novel foraging task were varied. We used discriminant function analysis (DFA) to classify six different vocalizations that were recorded when two bats were present. Contingency table analyses revealed a higher prevalence of social calls when males were present, and some call types varied in frequency of emission based on trial type or bat age. Bats flew closer together around the time some social calls were emitted, indicating that communicative calls may be selectively produced when conspecifics fly near one another. These findings are the first reports of social calls from flying big brown bats and provide insight into the function of communicative vocalizations emitted by this species.
authors: Department of Biology, University of Maryland College Park, MD, USA ; Department of Psychology, University of Maryland College Park, MD, USA.
authors: Genevieve S
authors: GS
authors: Wright
authors: Chen
authors: C
authors: Chiu
authors: Wei
authors: W
authors: Xian
authors: Gerald S
authors: GS
authors: Wilkinson
authors: Cynthia F
authors: CF
authors: Moss
keywords: Eptesicus fuscus; big brown bat; communication; competition; foraging; inter-bat distance; social calls
references: PLoS One. 2009 Aug 25;4(8):e6746
references: 19707550
references: Dev Psychobiol. 1975 Jul;8(4):333-46
references: 1225700
references: J Acoust Soc Am. 2000 Nov;108(5 Pt 1):2419-29
references: 11108382
references: J Exp Zool. 1965 Apr;158:319-42
references: 14327195
references: J Comp Physiol A Neuroethol Sens Neural Behav Physiol. 2011 May;197(5):459-67
references: 21327335
references: J Exp Zool. 1971 Mar;176(3):315-28
references: 5548872
references: J Acoust Soc Am. 2008 Sep;124(3):1838-48
references: 19045674
references: Anim Behav. 2011 Nov 1;82(5):1075-1083
references: 22328786
references: PLoS One. 2012;7(9):e44550
references: 22970247
references: Proc Natl Acad Sci U S A. 2008 Sep 2;105(35):13116-21
references: 18725624
references: Anim Behav. 1998 Feb;55(2):337-50
references: 9480702
references: Biol Lett. 2010 Aug 23;6(4):441-4
references: 20071395
references: J Comp Physiol A Neuroethol Sens Neural Behav Physiol. 2011 May;197(5):447-57
references: 20686895
references: J Acoust Soc Am. 1994 Sep;96(3):1229-54
references: 7962992
references: J Acoust Soc Am. 2008 Jul;124(1):598-608
references: 18647002
references: Proc Biol Sci. 2012 Dec 7;279(1748):4827-35
references: 23034703
references: J Mammal. 1973 Nov;54(4):998-1001
references: 4761376