Joint tail and vocal alarm signals of gray squirrels (Sciurus carolinensis)
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Threat-specific vocalizations have been observed in primates and ground squirrels, but their contemporaneous usage with visible signals has not been experimentally analyzed for association with threat type. Here we examine the eastern gray squirrel, an arboreal squirrel that uses both vocal and tail signals as alarms. Squirrels were presented with cat and hawk models simulating natural terrestrial or aerial predator attacks and also with control objects that do not resemble predators but approach in a similar manner. Individuals responded with tail signals (twitches and flags) and vocalizations (kuks, quaas and moans), but only flags and moans are associated with predator type. Moans were elicited primarily by aerial stimuli and flags by terrestrial stimuli. Eastern gray squirrels use an alarm-signaling system in which signals in each modality potentially are associated with particular attributes of a threat or may be general alarms. Terrestrially-approaching stimuli yielded vocal and tail alarm signals regardless of whether the stimulus resembled a predator. With aerially-approaching stimuli, however, quaas were used more often when the stimulus resembled an aerial predator than when it did not. An approaching object’s physical appearance may therefore affect squirrels’ responses to aerial, but not terrestrial, objects. When the stimuli resembled real predators approaching in the natural manner (terrestrially or aerially), both tail flags and vocal moans were associated with predator type, so we also considered moans and flags together. The presence and absence of moans and flags in an alarm signaling bout yields a higher statistical index of predictive association as to whether the threat is aerial or terrestrial than does either component alone.
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-
Altmann J. (1974). Observational study of behavior: sampling methods. — Behaviour 49: 227-267.
-
Barbour M.A., Clark R.W. (2012). Ground squirrel tail-flag displays alter both predatory strike and ambush site selection behaviours of rattlesnakes. — Proc. Roy. Soc. Lond. B: Biol. Sci. 279: 3827-3833.
-
Barkalow F.S., Shorten M. (1973). The world of the gray squirrel, 1st edn. — J.B. Lippincott, New York, NY.
-
Cohen J. (1960). A coefficient of agreement for nominal scales. — Educ. Psychol. Measurem. 20: 37-46.
-
Davis L.S. (1984). Alarm calling in Richardson’s ground squirrels (Spermophilus richardsonii). — Z. Tierpsychol. 66: 152-164.
-
Digweed S., Rendall D. (2009). Predator-associated vocalizations in North American red squirrels (Tamiasciurus hudsonicus): to whom are alarm calls addressed and how do they function? — Ethology 115: 1190-1199.
-
Fitzgibbon C.D. (1994). The costs and benefits of predator inspection behaviour in Thomson’s gazelles. — Behav. Ecol. Sociobiol. 34: 139-148.
-
Furrer R.D., Manser M.B. (2009). The evolution of urgency-based and functionally referential alarm calls in ground-dwelling species. — Am. Nat. 173: 400-410.
-
Hennessy D.F., Owings D.H., Rowe M.P., Coss R.G., Leger D.W. (1981). The information afforded by a variable signal: constraints on snake-elicited tail flagging by California ground squirrels. — Behaviour 78: 188-226.
-
Huynh H., Bertolino S., Koprowski J., Williams G., Thompson C., McAlpine D. (2011). The even darker side of the eastern gray squirrel (Sciurus carolinensis): a review of global introductions, invasion biology, and pest management strategies. — Julius-Kühn-Archiv 432: 31.
-
Kaufman K.B., Rosenthal R. (2009). Can you believe my eyes? The importance of interobserver reliability statistics in observations of animal behaviour. — Anim. Behav. 78: 1487-1491.
-
Lariviere S., Walton L.W. (1997). Lynx rufus. — Mamm. Spec. 563: 1-8.
-
Leger D.W., Owings D.H. (1978). Responses to alarm calls by California ground squirrels: effects of call structure and maternal status. — Behav. Ecol. Sociobiol. 3: 177-186.
-
Leger D.W., Owings D.H., Gelfand D.L. (1980). Single-note vocalizations of California ground squirrels: graded signals and situation-specificity of predator and socially evoked calls. — Z. Tierpsychol. 52: 227-246.
-
Lishak R.S. (1984). Alarm vocalizations of adult gray squirrels. — J. Mammal. 65: 681-684.
-
Macedonia J.M., Evans C.S. (1993). Variation among mammalian alarm call systems and the problem of meaning in animal signals. — Ethology 93: 177-197.
-
Manser M.B. (2001). The acoustic structure of suricates’ alarm calls varies with predator type and the level of response urgency. — Proc. Roy. Soc. Lond. B: Biol. Sci. 268: 2315-2324.
-
Marler P., Evans C.S., Hauser M.D. (1992). Animal signals: motivational, referential, or both? — In: Nonverbal vocal communication: comparative and developmental approaches. Studies in Emotion and Social Interaction ( Papousek H., Jürgens U., eds). Cambridge University Press, New York, NY, p. 66-86.
-
McRae T.R. (2012). Predator-specificity of multimodal alarm signals in the eastern gray squirrel (Sciurus carolinensis). — PhD dissertation, University of Miami, Coral Gables, FL.
-
Meng H. (1959). Food habits of nesting Cooper’s hawks and goshawks in New York and Pennsylvania. — Wilson Bull. 71: 169-174.
-
Otovic P., Partan S.R. (2009). Multimodal signalling in animals. — In: The new encyclopedia of neuroscience ( Squire L.R., Editor-in-Chief). Academic Press, Oxford, p. 1095-1105.
-
Owings D.H., Leger D.W. (1980). Chatter vocalizations of California ground squirrels: predator- and social-role specificity. — Z. Tierpsychol. 184: 163-184.
-
Owings D.H., Virginia R.A. (1978). Alarm calls of California ground squirrels (Spermophilus beecheyi). — Z. Tierpsychol. 46: 58-70.
-
Owren M.J., Rendall D., Ryan M.J. (2010). Redefining animal signaling: influence versus information in communication. — Biol. Philos. 25: 755-780.
-
Partan S.R., Larco C.P., Owens M.J. (2009). Wild tree squirrels respond with multisensory enhancement to conspecific robot alarm behaviour. — Anim. Behav. 77: 1127-1135.
-
Partan S.R., Fulmer A.G., Gounard M.A.M., Redmond J.E. (2010). Multimodal alarm behavior in urban and rural gray squirrels studied by means of observation and a mechanical robot. — Curr. Zool. 56: 313-326.
-
Robinson S.R. (1981). Alarm communication in Belding’s ground squirrels. — Z. Tierpsychol. 56: 150-168.
-
Searcy W.A., Nowicki S. (2006). Signal interception and the use of soft song in aggressive interactions. — Ethology 112: 865-872.
-
Seyfarth R.M., Cheney D.L., Marler P. (1980a). Monkey responses to three different alarm calls: evidence of predator classification and semantic communication. — Science 210: 801-803.
-
Seyfarth R.M., Cheney D.L., Marler P.M. (1980b). Vervet monkey alarm calls — semantic communication in a free-ranging primate. — Anim. Behav. 28: 1070-1094.
-
Sloan J.L., Wilson D.R., Hare J.F. (2005). Functional morphology of Richardson’s ground squirrel, Spermophilus richardsonii, alarm calls: the meaning of chirps, whistles and chucks. — Anim. Behav. 70: 937-944.
-
Steele M.A., Koprowski J.L. (2003). North American tree squirrels, 1st edn. — Smithsonian Books, Washington, DC.
-
Stegmann U. (2013). Animal communication theory — information and influence. — Cambridge University Press, Cambridge.
-
Struhsaker T.T. (1967). Auditory communication among vervet monkeys (Cercopithecus aethiops). — In: Social communication among primates, 1st edn. ( Altmann S.A., ed.). The University of Chicago Press, Chicago, IL, p. 281-324.
-
Swaisgood R.R., Rowe M.P., Owings D.H. (2003). Antipredator responses of California ground squirrels to rattlesnakes and rattling sounds: the roles of sex, reproductive parity, and offspring age in assessment and decision-making rules. — Behav. Ecol. Sociobiol. 55: 22-31.
-
Uhl G., Elias D.O. (2011). Communication. — In: Spider behaviour: flexibility and versatility, 1st edn. ( Herberstein M.E., ed.). Cambridge University Press, Cambridge, p. 127-189.
-
Warkentin K.J., Keeley A.T.H., Hare J.F. (2001). Repetitive calls of juvenile Richardson’s ground squirrels (Spermophilus richardsonii) communicate response urgency. — Can. J. Zool. 79: 569-573.
-
Wheeler B.C. (2010). Production and perception of situationally variable alarm calls in wild tufted capuchin monkeys (Cebus apella nigritus). — Behav. Ecol. Sociobiol. 64: 989-1000.
-
Zuberbühler K., Jenny D., Bshary R. (1999). The predator deterrence function of primate alarm calls. — Ethology 105: 477-490.
| All Time | Past 365 days | Past 30 Days | |
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Joint tail and vocal alarm signals of gray squirrels (Sciurus carolinensis)
In: BehaviourSearch for other papers by Thaddeus R. McRae in
Current site
Google Scholar
PubMed
Search for other papers by Steven M. Green in
Current site
Google Scholar
PubMed
Threat-specific vocalizations have been observed in primates and ground squirrels, but their contemporaneous usage with visible signals has not been experimentally analyzed for association with threat type. Here we examine the eastern gray squirrel, an arboreal squirrel that uses both vocal and tail signals as alarms. Squirrels were presented with cat and hawk models simulating natural terrestrial or aerial predator attacks and also with control objects that do not resemble predators but approach in a similar manner. Individuals responded with tail signals (twitches and flags) and vocalizations (kuks, quaas and moans), but only flags and moans are associated with predator type. Moans were elicited primarily by aerial stimuli and flags by terrestrial stimuli. Eastern gray squirrels use an alarm-signaling system in which signals in each modality potentially are associated with particular attributes of a threat or may be general alarms. Terrestrially-approaching stimuli yielded vocal and tail alarm signals regardless of whether the stimulus resembled a predator. With aerially-approaching stimuli, however, quaas were used more often when the stimulus resembled an aerial predator than when it did not. An approaching object’s physical appearance may therefore affect squirrels’ responses to aerial, but not terrestrial, objects. When the stimuli resembled real predators approaching in the natural manner (terrestrially or aerially), both tail flags and vocal moans were associated with predator type, so we also considered moans and flags together. The presence and absence of moans and flags in an alarm signaling bout yields a higher statistical index of predictive association as to whether the threat is aerial or terrestrial than does either component alone.
| All Time | Past 365 days | Past 30 Days | |
|---|---|---|---|
| Abstract Views | 7185 | 658 | 66 |
| Full Text Views | 719 | 59 | 5 |
| PDF Views & Downloads | 485 | 107 | 11 |