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    Ultimate causes of antipredator vocalizations in a nonhibernating squirrel

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    Burnett&Koprowski2020_preprint.pdf
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    Description:
    Final Accepted Manuscript
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    Author
    Burnett, Alexandra D.
    Koprowski, John L.
    Affiliation
    Univ Arizona, Sch Nat Resources & Environm
    Issue Date
    2020-09-22
    Keywords
    antipredator
    behaviour
    communication
    evolution
    
    Metadata
    Show full item record
    Publisher
    ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
    Citation
    Burnett, A. D., & Koprowski, J. L. (2020). Ultimate causes of antipredator vocalizations in a nonhibernating squirrel. Animal Behaviour, 168, 225-230.
    Journal
    ANIMAL BEHAVIOUR
    Rights
    © 2020 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Communication plays an integral role in facilitating intra- and interspecific interactions. The study of signal function and content reveals the rules that govern such interactions, informing hypotheses in behavioural ecology and evolution. The ubiquitous nature of antipredator vocalizations in ground squirrels provides a useful model for studying the evolution of communication. Conspecifics in many ground squirrel species respond to anti-predator vocalizations, and sociality functions as a strong selective force favouring more informative antipredator vocalizations. However, studies of a single antipredator vocalization system in both social and nonsocial contexts are relatively scarce, preventing diagnosis of selective forces other than sociality. We conducted a 2-year study to test two alternative hypotheses relating to the function of antipredator vocalizations in a nonhibernating squirrel, the Harris' antelope squirrel, Ammospermophilus harristi. We hypothesized that if vocalizations function as a predator deterrent, callers should be of equal sex ratio and vocalize year-round. If vocalizations function primarily as a warning to offspring, callers should be predominantly female and vocalize only when juveniles are above ground. We found that spontaneous callers were predominantly female but vocalized throughout the year. We also found that call bouts varied in trill number, which could hold additional layers of information. Our results suggest that antipredator vocalizations function as both a predator deterrent and a warning to offspring. Antipredator vocalizations with multiple functions or receivers are subject to a greater compilation of selective forces that may induce communicative complexity to arise. (C) 2020 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.
    Note
    24 month embargo; published 22 September 2020
    ISSN
    0003-3472
    DOI
    10.1016/j.anbehav.2020.08.016
    Version
    Final accepted manuscript
    Sponsors
    American Society of Mammalogists
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.anbehav.2020.08.016
    Scopus Count
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    UA Faculty Publications

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