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.
Results
Showing 1 to 20 of 43 for “"novel environment"”.
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The role of life-histories in colonising a novel environment
… colonise a new habitat and/or begin to utilise a novel resource. Savannah grasslands represented a novel niche during the Miocene and their colonisation from ancestral forests has resulted in rapid diversification of numerous plants, invertebrates and vertebrates. However, colonising seasonal …
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Assessing the role of the hippocampus in amygdala kindled fear : an analysis of environmental habituation
… the ability of the animals to habituate to a novel environment was evaluated, in order to determine if the rats displayed impairments in this hippocampal-dependent function. In Experiment 1, long-term kindled rats demonstrated consistently elevated exploration and fear over repeated exposure …
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Locomotor activity does not predict individual differences in morphine self-administration in rats
… the relationship between locomotor activity in a novel environment, a preclinical model of sensation-seeking, and individual differences in acquisition of i.v. morphine self-administration (SA) in rats. A secondary goal was to evaluate the relationship between activity and elasticity of demand …
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Memory processing of novel experiences in the hippocampus
… A potential factor in this selection may be novelty of incoming information. To avoid redundancy in memory storage, the hippocampus may prefer to process novel stimuli. In this dissertation, I used extracellular tetrode recording techniques in freely behaving rats to demonstrate selective …
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The Effects of Allopregnanolone on Feeding: A Behavioural Investigation
… licking of a sucrose solution, only when it was novel, indicating a reduction in neophobia (food related). In a lickometer/automated open field test, allopregnanolone significantly reduced thigmotaxis produced by exposure to a novel environment further indicating a reduction in neophobia …
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Food Habits, Growth, Conversion Efficiency and Response to Prey Odors of the Copperhead, Agkistrodon Contortrix
… for juveniles. Copperheads explored a clean, novel environment with a similar TFR to an environment containing prey odors. This suggests that stimuli other than prey odors are necessary to stimulate the vomeronasal system of copperheads.
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Stimulus Modality and the Rotational Error: An Examination of the Various Reorientation Accounts in Humans Using a 3D Virtual Environment
<p>Reorientation occurs when an organism enters a novel environment and utilizes cues within said environment to get its bearings. Though reorientation occurs, little is known about which cues are utilized to reorient and the mechanism underlying this reorientation process. Three competing accounts …
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Behavioral Changes in Adult C57BL/6J Mice following Prenatal Exposure to Ethanol.
… loco-motor activity and emotional reaction to a novel environment had been affected. Significant differences due to treatment and sex were noted for both the number of urinations (p=.005 and .001, respectively) and fecal boli (p=.011 and .001, respectively). These results suggest that the …
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The eco-evolutionary consequences of multiple introductions for colonizing individuals
Predicting the fate of individuals colonizing novel habitats is an elusive but critical goal in fields as diverse as invasion biology, biological control, climate change-induced species range shifts, and reintroductions of rare species. Propagule pressure, which comprises the number of introduction …
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Pose: Scalable General-Purpose Parallel Discrete Event Simulation
We propose a novel environment for PDES that facilitates the development of highly parallel models and requires minimal understanding of parallel computing concepts. We propose four primary approaches to improving the performance of PDES. We first examine the overhead required for synchronizing …
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Personality in Stomatopod Crustaceans
… differences in behaviors: 1) exploration of a novel environment, 2) response to and recovery from a startling event, and 3) response to a novel object. Each individual went through the series of tests twice, with a 14-day interval, to test for consistency over time. Sixteen measured behavioral …
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An experimental investigation into the mechanisms of bacterial evolution
… the bacterium <em>Escherichia coli</em> through novel experimental assays and mathematical simulations. First, I will develop a growth assay utilizing the quantitative polymerase chain reaction (qPCR) to provide real-time enumeration of genetic marker abundance within bacterial populations. …
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THE ECOLOGICAL IMPORTANCE AND EVOLUTIONARY POTENTIAL OF PHENOTYPIC PLASTICITY IN NOVEL ENVIRONMENTS
… different phenotypes in response to different environments. How organisms respond to environments through phenotypic plasticity can impact the fitness of individuals and thus the demography and even evolution of a population. Having environmentally relevant phenotypic responses could be …
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Compositional Robot Learning for Generalizable Interactions
To understand environments effectively and to interact safely with humans, robots must generalize their learned models to scenarios they have never been trained on before, such as new commands and new agents. Humans have shown a remarkable ability to compose concepts they have learned before in …
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Intensive sampling and comparison of methods in detection of non-indigenous species
… species (NIS) newly introduced to a novel environment usually experience a lag time before the population grows to a detectable level. Management of the NIS during the lag phase provides a better opportunity for eradication than at later stages when the population is larger and …
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Murine Phenotype Analyses and the Role of TRPV1 in Hypoxia
The environment in which animals are maintained is a factor that has the potential to alter the physiologic phenotype. We addressed the hypothesis that the standard animal care (SAC) environment cause significant deviations in the circadian variation of heart rate (HR), body temperature (Tb) and …
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Musculoskeletal adaptation to Partial Weight Suspension : studies of Lunar and Mars loading
… understand the physiologic effects of this novel environment. In the weight bearing structures of the body, bone loss and muscle atrophy far in excess of age-related declines are hallmarks of microgravity adaptation. However, while the physiological effects of such disuse unloading are …
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Acetylcholine dynamics in the retrosplenial cortex during spatial uncertainty
… Mice learned to anticipate reward in stable environments and adapted flexibly to changes in reward location or environmental context. GRAB-ACh imaging revealed that dRSC cholinergic dynamics are strongly modulated by uncertainty. Novel environment switches evoked large, sustained increases in …
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Use of personality to improve reintroduction success: the effects of behavioural variation within release groups
… behaviour response after release into a novel environment. Experimental and theoretical discussions have since suggested that varying the composition of personality types within a release group may therefore affect the success of a translocation. This study investigates practical aspects …
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Individual sensitivity to novelty and (+)-3,4-methylenedioxymethamphetamine: Roles for serotonin and GABA neurotransmission
… on their differential locomotor response to a novel environment into high responder rats (HR) and low responder rats (LR). In addition to an increased sensitivity to (+)-MDMA, we uncovered basal differences in the 5-HT system between HR and LR rats, an increased level of expression of the …
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