Journal Article

Signaler and Receiver Ages Do Not Affect Responses to Richardson's Ground Squirrel Alarm Calls

David C. Swan and James F. Hare

in Journal of Mammalogy

Published on behalf of American Society of Mammalogists

Volume 89, issue 4, pages 889-894
Published in print August 2008 | ISSN: 0022-2372
Published online August 2008 | e-ISSN: 1545-1542 | DOI: https://dx.doi.org/10.1644/07-MAMM-A-228.1
Signaler and Receiver Ages Do Not Affect Responses to Richardson's Ground Squirrel Alarm Calls

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  • Zoology and Animal Sciences
  • Animal Behaviour and Behavioural Ecology
  • Animal Ecology
  • Animal Physiology
  • Mammalogy

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Alarm calls alert receivers to the presence and/or nature of a predatory threat. Studies of alarm communication in Richardson's ground squirrels (Spermophilus richardsonii) have focused on juvenile signalers and receivers; however, adult and juvenile receivers may tailor their response to alarm calls based on different underlying signal parameters and attend differentially to alarm calls broadcast by adult versus juvenile signalers. To examine the potential influence of signaler and receiver age on the perception of response urgency, we presented free-living juvenile and adult S. richardsonii with alarm calls produced by juveniles and adults. Behavioral responses of call recipients were videotaped and analyzed to determine the influence of signaler and receiver age-class. No differences in vigilance response after juvenile- and adult-produced calls were detected for either adult or juvenile receivers. At the proximate level, the absence of any detectable difference in the acoustic attributes of juvenile-versus adult-produced calls may account for the lack of differential response. The absence of any age-dependent productional difference also is consistent with the recently advanced notion of young concealing information regarding their age in their alarm signals.

Keywords: alarm communication; receiver age; Richardson's ground squirrels; signaler age; Spermophilus richardsonii

Journal Article.  4614 words. 

Subjects: Zoology and Animal Sciences ; Animal Behaviour and Behavioural Ecology ; Animal Ecology ; Animal Physiology ; Mammalogy

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