Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"alarm call"”.
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Social context affects behavioral responsiveness to maternal alarm calls in Bobwhite quail chicks
… behavioral context (testing environment) on the alarm call responsiveness of maternally naive, incubator-reared bobwhite quail chicks. Experiment 1 assessed alarm call responsiveness in socially-reared, socially-tested hatchlings across the first 96 hours following hatch. No significant age …
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Fork-Tailed Drongos (Dicrurus adsimilis) use different types of mimicked alarm calls in response to different alarm threats
… I propose that some of these species produce alarm mimicry in the appropriate alarm contexts, matching the context of call production by the model species whose calls are mimicked. Previous research suggests that alarm mimicry in the appropriate context could provide heterospecifics with …
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Vocalizations influence roost-site selection in overwintering cavity-nesting birds in Eastern Washington
… microclimate available. Birds in flocks use alarm calls to warn of threats and contact calls to promote group cohesion. My study asks if timing of roost site selection and vocalizations influence the frequency and flock size of cavity- nesting birds inspecting roosting sites and if flock size …
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Comportamento reprodutivo do Jaçanã Jacana jacana (L., 1766) (Aves, Charadriiformes, Jacanidae) no Estado do Rio de Janeiro
… State of Rio de Janeiro, two of them in a region called "Campo do Saco" and the other in the Aguiculture Center of the UFRRJ. The territories occupied were small as compared with other areas where they were studied. Sex-role reversal occured and while females laid and defended territories, males …
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Perceived Predation Risk And The Responses Of Adult And Nestling Tree Swallows (tachycineta Bicolor)
<p>Some species of birds have alarm calls that are functionally referential and provide their nestlings with information about the level of threat predators may pose. Although several investigators have examined the responses of nestlings of species with open-cup nests to the anti-predator calls of …
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Demography and Behavior of Western Sandpipers (Calidris mauri) Breeding on the Yukon-Kuskokwim River Delta, Alaska
… field, I demonstrated: (1) chicks respond to the alarm call by vocalizing relatively less often and moving away from the signal source, (2) chicks respond to the gather call by vocalizing relatively more often and moving toward the signal source, (3) and chicks respond to the freeze call by …
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Food theft by deceptive alarm calls in the fork-tailed drongo
Why do animals make false alarms; are false alarms truly deceptive; and if, just as in Aesop's fable 'The boy who cried wolf' , animals can learn to ignore false alarms, why doesn't deception break down? I investigated these questions in a population of habituated and individually recognisable …
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Vocal responses of Blue Jays (Cyanocitta cristata) to raptors that differ in predatory threat
… Some species of flocking birds use referential calls to communicate predator presence and the level of threat posed by predators. Previous studies have revealed that two species in the corvid family, American Crows (Corvus brachyrhynchos) and Siberian Jays (Perisoreus infaustus), use referential …
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The Physics of Rodent Ultrasonic Vocalizations
… Of these two the mechanism behind the rodent calls are better understood. Thus, this thesis investigates the physics of rodent USVs with the hope that findings will help elucidate the mechanisms behind cetacean USVs. Chapter 1 discusses the anatomical background of rodent vocal tracts, …
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Alarm Calls and Information Use in the New Holland honeyeater
… as a model system to examine how alarm calls encode information about danger and to understand how this information is used by receivers. In Chapter 2, observational data showed that these honeyeaters produce multi-element, aerial alarm calls in response to flying threats. Male …
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Vocal responses of adult Eastern Bluebirds (Sialia sialis) to potential nest predators and the behavioral responses of nestlings
<p>The alarm calls of some birds are functionally referential and may provide nestlings with information about the threat posed by potential predators. However, few investigators have examined the responses of nestlings in cavity nests to the anti-predator vocalizations of adults. Therefore, the …