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• W2051201865 abstract "Abstract Calls and displays elicited by predators usually function as alarms or to inform predators of their detection. However, predator encounters may afford some individuals the opportunity to demonstrate quality or signal their availability. Here, I report on a class of vocal signals produced in predator‐elicited displays that share many characteristics with sexually selected song. White‐throated magpie‐jays ( Calocitta formosa ) display at low‐threat predators while producing ‘loud display calls’ (LDCs). I use this term because the calls occur primarily in two display contexts (see below) though occasionally in other contexts as well. Such calls and displays are primarily produced by males, and also occur in one other context, at dawn. Playback experiments showed that despite being elicited by predators, males were more likely than females to respond to LDCs, and more likely to respond when their mate was fertile. Over 134 different call types were produced in over 200 displays by 34 males; the largest minimum repertoire size was 67. Presentations of taxidermic raptor mounts elicited some LDCs, but fewer calls and lower diversity than at dawn or in predator approach displays. The male bias and high diversity suggest that LDCs are an outcome of intersexual selection, while their elicitation by predators suggests an alarm function. I propose that male magpie‐jays use predator encounters as opportunities to advertise their presence and availability as mates; they use LDCs as songs. Such a communication system seems to have been favored by the unusual social system of magpie‐jays, in which female groups defend territories and males have little opportunity to defend resources for mate attraction, forcing them to advertise when females are paying the most attention, during predator encounters." @default.
• W2051201865 created "2016-06-24" @default.
• W2051201865 creator A5067537596 @default.
• W2051201865 date "2009-05-11" @default.
• W2051201865 modified "2023-10-16" @default.
• W2051201865 title "Anti-Predator Signals as Advertisements: Evidence in White-Throated Magpie-Jays" @default.
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• W2051201865 doi "https://doi.org/10.1111/j.1439-0310.2009.01631.x" @default.
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