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- Bessa Ferreira, Vitor Hugo, et al.
(författare)
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Effects of domestication on responses of chickens and red junglefowl to conspecific calls: A pilot study
- 2022
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Ingår i: PLOS ONE. - : PUBLIC LIBRARY SCIENCE. - 1932-6203. ; 17:12
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Tidskriftsartikel (refereegranskat)abstract
- Beyond physical and zootechnical characteristics, the process of animal domestication has also altered how domesticated individuals, compared to their wild counterparts, perceive, process, and interact with their environment. Little is known, however, on whether and how domestication altered the perception of conspecific calls on both domesticated and wild breeds. In the present work, we compared the vigilance behavior of domestic and captiveborn wild fowl following the playback of chicken alarm calls and contentment calls (control). The playback tests were performed on four different breeds/lines. We first compared the behavioral reaction of domesticated White Leghorn (WL, a breed selected for egg production) and Red Junglefowl (RJF) hens (ancestor of domestic chickens). We also compared the behavior of Red Junglefowl hens selected for high or low fear of humans (RJF HF and RJF LF, respectively), a proxy to investigate early effects of domestication. Contrary to our expectations, no breed/line reacted accordingly to the calls, as the increase in vigilance behavior after the playback calls was similar for both alarm and contentment calls. Although no call discrimination differences were found, breeds did differ on how they reacted/habituated to the calls. Overall, WL were more vigilant than RJF, and birds from the RJF LF line decreased their vigilance over testing days, while this was not the case for the RJF HF line. These results suggest that birds under commercial-like conditions are unable to discriminate between alarm and contentment calls. Interestingly, domestication and selection for low fear of humans may have altered how birds react to vocal stimuli. It is important to consider that farmed animals may interpret and be affected by the vocalizations of their conspecifics in unexpected ways, which warrants further investigation.
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| 2. |
- Dutour, Mylene, et al.
(författare)
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Great tit responses to the calls of an unfamiliar species suggest conserved perception of call ordering
- 2020
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Ingår i: Behavioral Ecology and Sociobiology. - : SPRINGER. - 0340-5443 .- 1432-0762. ; 74:3
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Tidskriftsartikel (refereegranskat)abstract
- Many species of birds produce distinct calls when mobbing predators. These calls often recruit nearby conspecifics and heterospecifics to help drive the predators away. In some species, such as members of the family Paridae, mobbing calls are composed of multiple elements that seem to follow a characteristic order. Previous work in parids demonstrated that note ordering influences both the responses of conspecifics and some other co-occurring Paridae species. Cross-species sensitivity to note ordering could result from individuals' learning to associate individual heterospecific calls with threats or, rather, because the typical note orderings are shared across species. Here, we test these hypotheses by assessing the responses of European great tits (Parus major) to the naturally and artificially ordered calls of black-capped chickadees (Poecile atricapillus), a North American species. In response to the naturally ordered mobbing calls of chickadees, we found that great tits exhibit vigilance and rapidly approach the sound source, behaviors that were indistinguishable to those expressed in response to conspecific calls. If learned associations are necessary for sensitivity to note ordering, then a key prediction is that great tit responses to naturally ordered and artificially reversed chickadee calls should be similar (and weak). In contrast to this prediction, we found that great tits were less vigilant, but approach the sound source in response to artificially reversed chickadee calls. These findings suggest that perception of note ordering patterns is conserved. However, they are also in agreement with a "perception bias" hypothesis: that the first notes of the call mask the notes that follow them, preventing the receiver from perceiving the second part of the call. Although we provide evidence against perception bias, further research is needed to convincingly disentangle these two hypotheses.
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