Abstract
Species communicating acoustically may develop behavioral responses that aid them to transmit information and overcome signal masking in habitats disturbed by anthropogenic noise. Although many studies have concentrated on road traffic noise, very few studies mentioned effects of low flying airplane flyby noise on the vocal behavior of frogs. We studied the Critically Endangered Pickersgill’s Reed frog (Hyperolius pickersgilli) native to the eastern coastal regions of South Africa as a case study. In order to evaluate the call of H. pickersgilli, we compared a site with high levels of airplane flyby noise to a reference site without any airplane activity. Our results show that H. pickersgilli males made changes in both temporal and spectral properties of their call. Males call significantly more during and after an airplane flyby in relation to the call rate before the noise stimulus, but resumed normal call rhythms when measurements were taken 15 min after overflight. We found that males call at higher mean dominant frequencies (df difference = 161.4 Hz, P < 0.05) when exposed to high-intensity airplane flyby noise. In comparison with call rate 5 min before the airplane flyby, males called 12 % more during and 18 % more after the airplane flyby. Although changes in the spectral and temporal properties of the call of H. pickersgilli were observed, this species was actively calling for much longer than any other local species. This is the first study from Africa to report effects of anthropogenic noise on anuran communication.
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Acknowledgments
The National Research Foundation provided financial support to DJDK for two years of this study (Grant UID: 84458). Accommodation, transport and selected sound equipment were funded by Stiftung Artenschutz. Jeanne Tarrant, Les Minter, John Malone and Kirsten Parris are thanked for valuable comments on earlier drafts of this manuscript. All appropriate ethics and other approvals for this research were obtained from the North-West University Ethics Committee (Ref. NWU-00075-13-A3).
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Kruger, D.J.D., Du Preez, L.H. The effect of airplane noise on frogs: a case study on the Critically Endangered Pickersgill’s reed frog (Hyperolius pickersgilli). Ecol Res 31, 393–405 (2016). https://doi.org/10.1007/s11284-016-1349-8
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DOI: https://doi.org/10.1007/s11284-016-1349-8