Asymmetrical interspecific communication of predatory threat in mixed-species colonies of lesser kestrels (Falco naumanni) and jackdaws (Corvus monedula)

Maurizio Sara', Daniela Campobello, Alexander J. Hare, James F. Hare

Research output: Contribution to journalArticle

Abstract

Sympatric species derive benefits by attending to information conveyed by heterospecifics. Our previous finding of reduced vigilance among jackdaws and lesser kestrels residing in mixed-species colonies suggested a reliance on interspecific communication of information regarding predatory threats. To test for interspecific communication of threat, we first determined whether jackdaw and lesser kestrel call structure varied with perceived threat. In this call production phase of our study, free-living birds in mixed-species colonies were presented with models representing a potential nest predator (European magpie) or with non-threatening stimuli (wood pigeon or wooden dowel) in proximity to nests. We recorded and subsequently analysed those calls to determine if any temporal or frequency-related call parameters differed by model type. In a second, perceptual phase of our study, we tested whether receivers perceive threat-related variation in both conspecific and heterospecific call structure by playing back call exemplars recorded in response to the predator model or to innocuous control stimuli, to determine whether free-living jackdaws or lesser kestrels respond differentially to playbacks of the different call types. We detected differences in vocalizations of both jackdaws and lesser kestrels relative to the model type presented, with more broadband (lesser kestrel) or noisy calls (jackdaws) in response to magpie versus innocuous model types. We also detected differential behavioural responses to call playbacks, with both jackdaws and lesser kestrels increasing vigilance and alarm calling in response to magpie-elicited jackdaw calls, but not to other call types. Taken together, our results suggest that jackdaw, but not lesser kestrel vocalizations, communicate enhanced threat associated with European magpies as possible nest predators. This interspecific alarm communication benefits both jackdaws and lesser kestrels, and, at least in part, explains asymmetric responses of jackdaws and lesser kestrels to magpies attending mixed-species colonies in nature.
Original languageEnglish
Pages (from-to)733-744
Number of pages12
JournalEthology
Volume125
Publication statusPublished - 2019

Fingerprint

Corvus monedula
Falco naumanni
animal communication
communication
nest
vigilance
vocalization
predator
nests
predators
behavioral response
dowels
bird
sympatry

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology

Cite this

@article{ff31faf275084c3bb2f6c04eb85b830f,
title = "Asymmetrical interspecific communication of predatory threat in mixed-species colonies of lesser kestrels (Falco naumanni) and jackdaws (Corvus monedula)",
abstract = "Sympatric species derive benefits by attending to information conveyed by heterospecifics. Our previous finding of reduced vigilance among jackdaws and lesser kestrels residing in mixed-species colonies suggested a reliance on interspecific communication of information regarding predatory threats. To test for interspecific communication of threat, we first determined whether jackdaw and lesser kestrel call structure varied with perceived threat. In this call production phase of our study, free-living birds in mixed-species colonies were presented with models representing a potential nest predator (European magpie) or with non-threatening stimuli (wood pigeon or wooden dowel) in proximity to nests. We recorded and subsequently analysed those calls to determine if any temporal or frequency-related call parameters differed by model type. In a second, perceptual phase of our study, we tested whether receivers perceive threat-related variation in both conspecific and heterospecific call structure by playing back call exemplars recorded in response to the predator model or to innocuous control stimuli, to determine whether free-living jackdaws or lesser kestrels respond differentially to playbacks of the different call types. We detected differences in vocalizations of both jackdaws and lesser kestrels relative to the model type presented, with more broadband (lesser kestrel) or noisy calls (jackdaws) in response to magpie versus innocuous model types. We also detected differential behavioural responses to call playbacks, with both jackdaws and lesser kestrels increasing vigilance and alarm calling in response to magpie-elicited jackdaw calls, but not to other call types. Taken together, our results suggest that jackdaw, but not lesser kestrel vocalizations, communicate enhanced threat associated with European magpies as possible nest predators. This interspecific alarm communication benefits both jackdaws and lesser kestrels, and, at least in part, explains asymmetric responses of jackdaws and lesser kestrels to magpies attending mixed-species colonies in nature.",
keywords = "alarm communication, eavesdropping, group living, interspecific association, public information, response urgency",
author = "Maurizio Sara' and Daniela Campobello and Hare, {Alexander J.} and Hare, {James F.}",
year = "2019",
language = "English",
volume = "125",
pages = "733--744",
journal = "Ethology",
issn = "0179-1613",
publisher = "Wiley-Blackwell",

}

TY - JOUR

T1 - Asymmetrical interspecific communication of predatory threat in mixed-species colonies of lesser kestrels (Falco naumanni) and jackdaws (Corvus monedula)

AU - Sara', Maurizio

AU - Campobello, Daniela

AU - Hare, Alexander J.

AU - Hare, James F.

PY - 2019

Y1 - 2019

N2 - Sympatric species derive benefits by attending to information conveyed by heterospecifics. Our previous finding of reduced vigilance among jackdaws and lesser kestrels residing in mixed-species colonies suggested a reliance on interspecific communication of information regarding predatory threats. To test for interspecific communication of threat, we first determined whether jackdaw and lesser kestrel call structure varied with perceived threat. In this call production phase of our study, free-living birds in mixed-species colonies were presented with models representing a potential nest predator (European magpie) or with non-threatening stimuli (wood pigeon or wooden dowel) in proximity to nests. We recorded and subsequently analysed those calls to determine if any temporal or frequency-related call parameters differed by model type. In a second, perceptual phase of our study, we tested whether receivers perceive threat-related variation in both conspecific and heterospecific call structure by playing back call exemplars recorded in response to the predator model or to innocuous control stimuli, to determine whether free-living jackdaws or lesser kestrels respond differentially to playbacks of the different call types. We detected differences in vocalizations of both jackdaws and lesser kestrels relative to the model type presented, with more broadband (lesser kestrel) or noisy calls (jackdaws) in response to magpie versus innocuous model types. We also detected differential behavioural responses to call playbacks, with both jackdaws and lesser kestrels increasing vigilance and alarm calling in response to magpie-elicited jackdaw calls, but not to other call types. Taken together, our results suggest that jackdaw, but not lesser kestrel vocalizations, communicate enhanced threat associated with European magpies as possible nest predators. This interspecific alarm communication benefits both jackdaws and lesser kestrels, and, at least in part, explains asymmetric responses of jackdaws and lesser kestrels to magpies attending mixed-species colonies in nature.

AB - Sympatric species derive benefits by attending to information conveyed by heterospecifics. Our previous finding of reduced vigilance among jackdaws and lesser kestrels residing in mixed-species colonies suggested a reliance on interspecific communication of information regarding predatory threats. To test for interspecific communication of threat, we first determined whether jackdaw and lesser kestrel call structure varied with perceived threat. In this call production phase of our study, free-living birds in mixed-species colonies were presented with models representing a potential nest predator (European magpie) or with non-threatening stimuli (wood pigeon or wooden dowel) in proximity to nests. We recorded and subsequently analysed those calls to determine if any temporal or frequency-related call parameters differed by model type. In a second, perceptual phase of our study, we tested whether receivers perceive threat-related variation in both conspecific and heterospecific call structure by playing back call exemplars recorded in response to the predator model or to innocuous control stimuli, to determine whether free-living jackdaws or lesser kestrels respond differentially to playbacks of the different call types. We detected differences in vocalizations of both jackdaws and lesser kestrels relative to the model type presented, with more broadband (lesser kestrel) or noisy calls (jackdaws) in response to magpie versus innocuous model types. We also detected differential behavioural responses to call playbacks, with both jackdaws and lesser kestrels increasing vigilance and alarm calling in response to magpie-elicited jackdaw calls, but not to other call types. Taken together, our results suggest that jackdaw, but not lesser kestrel vocalizations, communicate enhanced threat associated with European magpies as possible nest predators. This interspecific alarm communication benefits both jackdaws and lesser kestrels, and, at least in part, explains asymmetric responses of jackdaws and lesser kestrels to magpies attending mixed-species colonies in nature.

KW - alarm communication

KW - eavesdropping

KW - group living

KW - interspecific association

KW - public information

KW - response urgency

UR - http://hdl.handle.net/10447/367605

UR - http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1439-0310

M3 - Article

VL - 125

SP - 733

EP - 744

JO - Ethology

JF - Ethology

SN - 0179-1613

ER -