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2 Acta Chiropterologica

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Sex and season differences in the echolocation pulses of big brown bats (Eptesicus fuscus) and their relation to mating activity

100%

Grilliot M. E. , Burnett S. C. , Mendonca M. T.

Acta Chiropterologica

2014

tom 16

nr 2

Although several studies have reported inter- and intra-individual variation in the echolocation pulses of big brown bats, relatively few have explored its function in the context of courtship and mating. In this study, we tested for sex and seasonal differences in the echolocation pulses of male and female big brown bats, and related these differences to mating activity. We recorded the echolocation pulses of adult female and male big brown bats in a controlled laboratory environment during the mating and three non-mating seasons. Factor analysis was used to reduce the number of call variables into two principle components (PC1 and PC2). Call components related to PC2 were significantly sexually dimorphic in the mating season. However, no call components were significantly sexually dimorphic in the non-mating season. In addition, we found a significant correlation between PC1 and the mating score of male bats. There was no significant correlation between principle components and the mating score of female bats. Our results provide additional support for the current literature that suggests a communicative function for bat echolocation pulses. Furthermore, it suggests that differences in the echolocation pulses of male and female bats may be important in the mating activity of this group.

Choice experiments demonstrate that male big brown bats (Eptesicus fuscus) prefer echolocation calls of high copulatory females

100%

Grilliot M. E. , Burnett S. C. , Mendonca M. T.

Acta Chiropterologica

2015

tom 17

nr 2

It generally is accepted that bats emit ultrasonic vocalizations that function for echolocation purposes as well as for communication. We tested whether male or female big brown bats (Eptesicus fuscus) responded to variation in echolocation calls of the opposite sex in a manner that would suggest calls are used in a mating context. We presented 31 female and 10 male big brown bats with ultrasonic playbacks of differentially mating (i.e., high frequency copulators = HM versus low-frequency copulators = LM) individuals of the opposite sex. We measured 1) which side of the arena each subject selected first (HM versus LM), and 2) duration spent (seconds) on each side of the arena (HM versus LM). For both of these measures (i.e., first choice and duration) male subjects were more likely to select the echolocation calls of HM females, but the same respective tests determined that female subjects did not select echolocation calls of frequently copulating males over calls of infrequently copulating males. These results support the possibility that the echolocation calls of big brown bats provides information about the sender that may be important in a mating context.