Individual variation in the echolocation calls of three sympatric Indian hipposiderid bats, and an experimental attempt to jam bat echolocation

G Jones, K Sripathi, Dean Andrew Waters, G Marimuthu

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We studied three species of hipposiderid bats coexisting in southern India. The species were scaled versions of similar wing shape, and were separated from one another in terms of echolocation call frequency and body size. All species used echolocation signals which consisted of constant-frequency (CF) components with frequency-modulated (FM) tails. The three species were Hipposideros speoris (length (FAL) = ca. 51 mm, CF = ca. 138 kHz) H. fulvus (FAL = ca. 39 mm, CF = ca. 157 kHz) and H. ater (FAL = ca. 36 mm, CF = ca. 166 kHz). In H. speoris no sexual size dimorphism was apparent, but males emitted higher CFs on average than females. Tn H. fulvus, females were the larger sex, but there was no difference in CF between sexes. In both sexes, CF was positively correlated with body condition. We tested whether individuals shifted personal CFs when Eying in groups in H, speoris, and found evidence only for small-scale (
Original languageEnglish
Pages (from-to)347-361
Number of pages15
Issue number4
Publication statusPublished - 1994

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