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 15 of 15 for “"defensive behaviors"”.
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Anti-Insect Defensive Behaviors of Equines after West Nile Virus Infection
… this disease caused changes in the animals defensive behaviors against biting insects, presumably because of to the neurological sequelae that can result from the infection. Results from behavioral observations and neurological reflex testing suggest that long-term survivors of WNV do not …
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Variation in Defensive Behaviors of the Western Cottonmouth (Agkistrodon Piscivorus) as a Result of Temperature, Size, and Reproductive Condition
Defensive responses during predatory encounters may vary according to the cost and benefits associated with different predatory contexts. In snakes, defensive behaviors may be influenced by temperature, sex, body size, and reproductive state. In response to human antagonists, the cottonmouth …
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Ecology of Neotropical Arboreal Snakes and Behavior of New World Mollusk-Eating Snakes
… the general ecology of arboreal snakes, the defensive behaviors of the snake community, and the diet of mollusk-eating snakes. I studied arboreal species to understand interspecilic relationships in several morphometric characters and to examine preferences in habitat. There were significant …
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Individual capture history affects site use and defensive behavior of foraging eastern copperheads at a recreational site
… suggests individuals allocate energy toward defensive behaviors equivalent to risk of predation. In this framework, repeat encounters with humans that do not reduce individual fitness could result in a decreased defensive response toward humans in subsequent encounters. I investigated the …
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Communication and Leadership: Faculty Perceptions of the Department Chair
… provides an empirical test of Gibb's theory of defensive vs. supportive communication. As such, this project investigated the communication and leadership behaviors of university department chairs as evaluated by their faculty members. Specifically, 202 randomly selected faculty members from …
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A study of disturbance behaviors in Uloborus glomosus (Araneae; Uloboridae) as possible predator avoidance strategies
… their eggsac chains exhibited two types of defensive behaviors when either the parasitoid Arachnopteromalus dasys or spiderlings were placed on their eggsacs. They jerked their webs and swept the eggsacs with their long front legs.
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Response to visual threats in Aedes aegypti mosquitoes
… evading the threats their hosts pose via their defensive behaviors. Female mosquitoes are indeed in this unique position where their fitness and reproduction depend on them being able to locate hosts as well as evade them. In order to do this, they rely on sensory cues that they must be able to …
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Mating behavior and the effects of turbidity on preferences for size in the fountain darter, Etheostoma fonticola
… E. fonticola exhibit differences in agonistic behaviors and consequently, mating success. We found that larger males exhibited higher rates of aggressive behaviors and smaller males in turn exhibited more defensive behaviors. However, differences between larger and smaller males in male-male …
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Naturally occurring variations in defensive burying behavior are associated with differences in central neuropeptide expression in the male rat
The shock prod defensive burying test has proven incredibly reliable and instrumental in determining the underpinnings of normal anxiety in rodents. Largely ignored in tests of defensive burying, however, is the capacity for individual animals to display marked variations in active and passive …
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Neurobehavioral Mechanisms Supporting the Generalization of Learned Fear in Humans
… an aversive event acquire the capacity to elicit defensive behaviors. This process helps ensure quick reactions prior to the occurrence of an imminent threat. A problem of living in a dynamic environment, however, is that reliable signals of danger are rarely re-encountered in the exact same form …
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Dopaminergic modulation of prefrontal cortex subpopulations
… is sufficient to drive place avoidance and defensive behaviors. Fourth, to determine the natural dynamics of individual mPFC neurons, we performed single-cell projection-defined microendoscopic calcium imaging to reveal a robust preferential excitation of mPFC-dPAG, but not mPFC-NAc, neurons …
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Studies on the mode of CRF action in the optic tectum of the African Clawed Frog, Xenopus laevis
Stress and anxiety induce the expression of defensive behaviors, which help animals escape from the source of danger or motivational conflict. An important brain area for coordinating the behavioral response to visual threats is the superior colliculus of the brain, an area involved in subconscious …
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Ontogeny of Venom Use and Venom Composition in the Western Widow Spider Latrodectus Hesperus
… investigated the ontogenetic development of defensive behaviors. Spiders relied largely on non–combative behaviors early in life and switched to more combative behaviors, including silk flicking and biting, as they increased in size. Sex differences in behavior were comparatively negligible. …
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Transcriptional effects of predator cues in the brain of Spodoptera frugiperda (lepidoptera: noctuidae) moths exposed to bat ultrasound
… stress responses in insects, many dramatic defensive behaviors in insects have been reported. Within several moth families, such as Noctuidae, tympanic organs for recognizing ultrasonic bat calls have evolved and facilitate the avoidance of predation via eliciting flight cessation or aerial …
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The biogeography of Striated Caracaras Phalcoboenus australis
… among island species - it deprived caracaras of defensive adaptations they might have once possessed, including wariness toward potential predators and nesting in inaccessible locations. The result was "ecological naivete", a phenomenon in which species that evolve in simple ecosystems lose (or …