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Advertising and receiving from heights increases transmission of vocalizations in semi-arboreal mice

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Behavioral Ecology and Sociobiology Aims and scope Submit manuscript

Abstract

Many animals produce long-distance acoustic signals to mediate a variety of social interactions, and the efficacy of transmission depends in part on environmental attenuation. Vocalizing from positions that optimize transmission is one key solution to minimizing attenuation, though few studies assess the magnitude of this effect in relation to receiver position. In this study, we assessed how transmission of high-frequency vocalizations produced by pinyon mice (Peromyscus truei) varied based on the position of senders and receivers. Pinyon mice are semi-arboreal rodents that produce sustained vocalizations to advertise to conspecifics. Synthesized signals derived from a population-sample-average of fundamental frequency, duration, and amplitude were broadcast and recorded at different heights (0, 1, and 2 m) and distances (1, 2, 4, and 8 m) in a full factorial design to mimic hypothetical senders and receivers. We also measured receiver hearing sensitivity using auditory brainstem responses (ABR) to quantify the audible distance (active space) of vocalizations at different heights. Vocalizations showed less attenuation when emitted and received from an elevation compared to the ground if the signal was received at least 4 m from the sender. Vocalizations emitted from a 1 m height had an approximately 3 times greater audible distance compared to the ground. Additionally, less attenuation occurred when both senders and receivers were elevated at the same height and when receivers were elevated, regardless of sender height. Our results highlight the importance of considering receiver position in animal communication, especially when senders produce highly directional signals.

Significance statement

Vocalizing animals often position themselves in locations that maximize sound transmission. However, the magnitude of this effect is not often quantified, especially in relation to the position of intended receivers. In this study, we combined acoustic recording, hearing experiments, and modelling of sound attenuation to quantify how sending and receiving vocalizations from trees impacts sound transmission in a semi-arboreal mouse. We found that vocalizations produced from 1 m above the ground could be heard by receivers at 3 times the distance compared to ground level. We also found that no matter the sender position, receivers benefitted from being at elevated positions. Finally, we found that the least attenuation occurred when senders and receivers were elevated at the same height. Our results highlight the importance of considering receiver position in animal communication, especially when senders produce highly directional signals.

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Data availability

All datasets generated and analyzed during this study are included in the supplementary information files of this published article.

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Acknowledgements

We thank E. Roden and D. Hendershott for assistance with trapping and recording mice. We thank two anonymous reviewers for their insightful comments that greatly improved the manuscript.

Funding

The study was funded by the American Society of Mammalogists Grants-in-Aid (RB), a Jean Schuler Research Mini-Grant from Northern Arizona University (RB), and the National Science Foundation IOS # 1755429 (BP).

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Authors and Affiliations

Authors

Contributions

RB and BP conceived the study, obtained the funding, and wrote the initial draft of the manuscript. RB, BP, and AK conducted the fieldwork. AK conducted the hearing experiments. SMM and all authors analyzed the data, and revised, edited, and approved the final version of the manuscript.

Corresponding author

Correspondence to Ryan Brzozowski.

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Ethics approval

All procedures were approved by Northern Arizona University’s Institutional Animal Care and Use Committee (19–006). Animals were captured with permits from the Arizona Game and Fish Department (SP403209). All research followed the guidelines for ethical treatment of animals established by the American Society of Mammalogists (Sikes 2016).

Competing interests

The authors declare no competing interests.

Additional information

Communicated by: E. Korpimäki.

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Brzozowski, R., Kobrina, A., Mahoney, S.M. et al. Advertising and receiving from heights increases transmission of vocalizations in semi-arboreal mice. Behav Ecol Sociobiol 77, 83 (2023). https://doi.org/10.1007/s00265-023-03352-4

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  • DOI: https://doi.org/10.1007/s00265-023-03352-4

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