Journal
BIOACOUSTICS-THE INTERNATIONAL JOURNAL OF ANIMAL SOUND AND ITS RECORDING
Volume 30, Issue 4, Pages 437-457Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09524622.2020.1803133
Keywords
Animal communication; advertisement call; Pacific tree frog; Pacific chorus frog; hyliola regilla; hyliola sierra
Categories
Funding
- San Francisco State University
- MARC scholarship [NIH MARC: T34-GM008574]
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Anuran advertisement calls are crucial in social interactions related to reproduction and are shaped by both natural and sexual selection. The study on Pacific tree frogs found that diphasic and monophasic calls have different correlations with body size and physical condition. While patterns of variation were similar between call types, monophasic calls were observed to have lower frequencies and faster delivery compared to diphasic calls.
Anuran advertisement calls play a fundamental role in social interactions related to reproduction, like territory defence and mate attraction. As such, advertisement calls are often shaped by natural and sexual selection. Therefore, to understand the evolution, function, and mechanisms of signal production and perception, it is important to characterise sources and patterns of variation in call properties. We recorded and analysed the two types of advertisement calls produced by Pacific tree frogs,Hyliola regilla: diphasic and monophasic calls. Specifically, we examined (i) the relationship between call properties and both body size and physical condition, (ii) patterns of within- and among-individual variation in call properties, and (iii) acoustic differences between diphasic and monophasic calls. While only one property of diphasic calls correlates with physical condition, spectral properties of both types of calls correlate with body size. Patterns of within- and among-individual variation were similar between call types and, overall, consistent with patterns reported for closely related species. Monophasic calls have lower frequencies, are delivered faster, and have higher call effort and duty cycle than diphasic calls. We discuss our results in relation to sexual selection and formulate hypotheses about the evolution, function, and mechanisms of acoustic communication in Pacific tree frogs.
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