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Raick X, Koussa A, Zawadzki CH, Kurchevski G, Godinho AL, Parmentier É. Sounds and associated morphology of
Hypostomus
species from South‐East Brazil. J Zool (1987) 2022. [DOI: 10.1111/jzo.12967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- X. Raick
- Laboratory of Functional and Evolutionary Morphology, Freshwater and Oceanic Science Unit of Research University of Liège Liège Belgium
| | - A. Koussa
- Laboratory of Functional and Evolutionary Morphology, Freshwater and Oceanic Science Unit of Research University of Liège Liège Belgium
| | - C. H. Zawadzki
- Departamento de Biologia Universidade Estadual de Maringá Maringá Paraná Brazil
| | - G. Kurchevski
- Fish Passage Center Federal University of Minas Gerais Belo Horizonte Minas Gerais Brazil
| | - A. L. Godinho
- Fish Passage Center Federal University of Minas Gerais Belo Horizonte Minas Gerais Brazil
| | - É. Parmentier
- Laboratory of Functional and Evolutionary Morphology, Freshwater and Oceanic Science Unit of Research University of Liège Liège Belgium
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Forsthofer M, Schutte M, Luksch H, Kohl T, Wiegrebe L, Chagnaud BP. Frequency modulation of rattlesnake acoustic display affects acoustic distance perception in humans. Curr Biol 2021; 31:4367-4372.e4. [PMID: 34416177 DOI: 10.1016/j.cub.2021.07.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 05/19/2021] [Accepted: 07/08/2021] [Indexed: 11/26/2022]
Abstract
The estimation of one's distance to a potential threat is essential for any animal's survival. Rattlesnakes inform about their presence by generating acoustic broadband rattling sounds.1 Rattlesnakes generate their acoustic signals by clashing a series of keratinous segments onto each other, which are located at the tip of their tails.1-3 Each tail shake results in a broadband sound pulse that merges into a continuous acoustic signal with fast-repeating tail shakes. This acoustic display is readily recognized by other animals4,5 and serves as an aposematic threat and warning display, likely to avoid being preyed upon.1,6 The spectral properties of the rattling sound1,3 and its dependence on the morphology and size of the rattle have been investigated for decades7-9 and carry relevant information for different receivers, including ground squirrels that encounter rattlesnakes regularly.10,11 Combining visual looming stimuli with acoustic measurements, we show that rattlesnakes increase their rattling rate (up to about 40 Hz) with decreasing distance of a potential threat, reminiscent of the acoustic signals of sensors while parking a car. Rattlesnakes then abruptly switch to a higher and less variable rate of 60-100 Hz. In a virtual reality experiment, we show that this behavior systematically affects distance judgments by humans: the abrupt switch in rattling rate generates a sudden, strong percept of decreased distance which, together with the low-frequency rattling, acts as a remarkable interspecies communication signal. VIDEO ABSTRACT.
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Affiliation(s)
- Michael Forsthofer
- Department Biology II, Ludwig-Maximilians-University Munich, Großhaderner Str. 2, Planegg 82152, Germany; Graduate School of Systemic Neurosciences, Ludwig-Maximilians-University Munich, Großhaderner Str. 2, Planegg 82152, Germany
| | - Michael Schutte
- Department Biology II, Ludwig-Maximilians-University Munich, Großhaderner Str. 2, Planegg 82152, Germany; Graduate School of Systemic Neurosciences, Ludwig-Maximilians-University Munich, Großhaderner Str. 2, Planegg 82152, Germany
| | - Harald Luksch
- Chair of Zoology, Technical University of Munich, School of Life Sciences, Liesel-Beckmann-Str. 4, Freising 85354, Germany
| | - Tobias Kohl
- Chair of Zoology, Technical University of Munich, School of Life Sciences, Liesel-Beckmann-Str. 4, Freising 85354, Germany
| | - Lutz Wiegrebe
- Department Biology II, Ludwig-Maximilians-University Munich, Großhaderner Str. 2, Planegg 82152, Germany
| | - Boris P Chagnaud
- Department Biology II, Ludwig-Maximilians-University Munich, Großhaderner Str. 2, Planegg 82152, Germany; Institute for Biology, Karl-Franzens-University Graz, Universitätsplatz 2, Graz 8010, Austria.
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