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 20 of 68 for “"Predator avoidance"”.
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Consensus, Cooperative Learning, and Flocking for Multi-agent Predator Avoidance
… related to defending or escaping from predators. In this thesis a hybrid multi-agent system that integrates consensus, cooperative learning, and flocking control to determine the direction of attacking predators and learn to flock away from them in a coordinated manner is proposed. This …
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A study of disturbance behaviors in Uloborus glomosus (Araneae; Uloboridae) as possible predator avoidance strategies
When touched with a contact stimulus, 50% of adult Uloborus glomosus jumped from the web; 33% remained motionless; 13% moved to the edge of the web; and 4% shook the web. In a population of juveniles, 45% moved to the edge of the web; 27% jumped from the web; 24% shook the web; and 4% remained …
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Nest Emergence and Chemosensory Mediated Predator Avoidance: Two Studies of Behavior in the Red-Eared Slider (Trachemys Scripta Elegans)
Predator avoidance is a key to the survival of any species. The emergence of offspring in a single event (mass emergence) aids early in life, while the ability to detect predators by olfactory means aids throughout. In one experiment, the effect of constant versus changing surface temperature on …
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HIDE AND SEEK: AN EXPLORATION OF ANTIPREDATOR AND PREDATOR AVOIDANCE MECHANISMS IN ORTHOPODOMYIA SIGNIFERA IN RESPONSE TO PREDATION FROM TOXORHYNCHITES RUTILUS
… signifera</em> coexisting with the predator <em>Toxorhynchites rutilus.</em> There are three hypotheses that could explain how <em>Or. signifera</em> resists predation from <em>Tx. rutilus</em>. The first hypothesis states that larvae adapt behavioral changes that limit predation. …
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Are animals choosing foraging patches according to spatial scaling laws or predator avoidance arguments? : a study on grazing ungulates in Hluhluwe Imfolozi
… not take into consideration the potential impact predator avoidance behaviour may have on patch choice. Smaller animals are more at risk from predation; thus they have to choose grazing patches that meet their nutritional requirements without exposing themselves to an added risk of predation
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The Influence of Tail Autotomy on Avoidance of Chemical Alarm Cues in Northern Zigzag Salamanders, Plethodon dorsalis
… and behavior of most species are influenced by predator-prey interactions. To avoid microhabitats that pose an increased predation risk salamanders may use predator avoidance. Salamanders detect chemical alarm cues via the vomeronasal organ and their avoidance of the chemical cues is based upon …
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Group size affects predation risk and foraging success in Pacific salmon at sea
… individual fitness, especially by improved predator avoidance and foraging efficiency. However, such theories are difficult to test in the wild, especially in marine environments where observing individuals is challenging, and quantifying predation risk or foraging success is often …
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Flight characteristics of pen-reared and wild prairie-chickens and an evaluation of a greenhouse to rear prairie-chickens
… with marginal success. Flight characteristics, predator avoidance behavior, and rearing methods are possible factors contributing to post-release mortality of pen-reared birds. To evaluate flight characteristics and predator avoidance behavior of pen-reared APC's released onto the Attwater …
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Studies on the mode of CRF action in the optic tectum of the African Clawed Frog, Xenopus laevis
… vertebrates, contributes to decision making on predator avoidance/prey capture tradeoffs. The neuropeptide corticotropin releasing factor (CRF) modulates discrete aspects of prey capture and predator avoidance, but the mechanisms underlying this modulation are unknown. This dissertation consists …
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Hatching synchrony and survival in early life in the painted turtle, Chrysemys picta
… births is thought to have evolved as a general predator avoidance strategy. In turtles, synchronous hatching promotes synchronous emergence from the nest and may limit predation by swamping and confusing predators or simply dilute the per capita risk of predation. However, synchronization of …
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The Influence of Forest Structure on Sumatran Orangutan Nesting and Densities in the Lowland Dipterocarp Forests of North Sumatra
… risk of predation by limiting access to ground predators (Ancrenaz et al. 2004a; Cheyne et al. 2013). The aims of this study were to answer three questions: why are nests built in a particular tree, why was the nest in that position and height within the tree and why build the nest in that part …
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Demography and movements of montain sheep (Ovis canadensis nelsoni) in the Kingston and Clark Mountain ranges, California
… after the hot season may have been influenced by predator avoidance.
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Spatial, temporal and spectral properties of photoreceptor cells in the fiddler crab Uca pugilator (Bosc, 1802)
… of their behaviors that include mate choice, predator avoidance, burrow surveillance, courtship and territorial interactions. Through several behavioral and optical experiments, it has been previously shown that they have 360° viewing angle on each eye, high spatial resolution along their …
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The contribution of the pectoral fins, body, and the ribbon fin to turning maneuvers of a gymnotiform swimmer
… in fishes as it is used in prey detection, predator avoidance, and to navigate complex environments. Fishes with traditional control surfaces primarily use body bending and pectoral fins to turn. However, little is known about how fishes with atypical control surfaces facilitate turning. …
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A study of the ecology of the Namaqua Sandgrouse and other arid-zone birds
… nest-predation rate and nest site, nest density, predator-avoidance behaviour, stage of the nesting cycle and season, and degree of residency. Furthermore, the importance of rainfall as a breeding stimulus and its effects on clutch size were investigated for several species. The Namaqua Sandgrouse …
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Diversity of Form, Content, and Function in the Vocal Signals of Adult Male Blue Monkeys (Cercopithecus mitis stuhlmanni): An Evolutionary Approach to Understanding a Signal Repertoire
… division, vocal signals play key roles in predator avoidance, reproduction, competition, and mediating social interactions. Understanding signaling systems, and the various selection factors relating to their evolution and maintenance, therefore provides unique insight into species' …
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Non-inertial Undulatory Locomotion Across Scales
Locomotion is crucial to behaviors such as predator avoidance, foraging, and mating. In particular, undulatory locomotion is one of the most common forms of locomotion. From microscopic flagellates to swimming fish and slithering snakes, this form of locomotion is a remarkably robust …
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Intertwined evolution of swimming, morphology and microhabitat in tree frogs from the subfamily Hylinae
… is a critical behavior during life history for predator avoidance, reproduction, and early developmental stages. However, it is still poorly understood how swimming evolved in closely related species with multiple locomotion modes. I included 225 individuals from 16 localities in Mexico, …
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Diel and horizontal patterns in the densities of Bythotrephes, Chaoborus, and Leptodora in a Minnesota Reservoir
… distributions of three invertebrate planktonic predators—Bythotrephes cederstroemii, Chaoborus punctipennis, and Leptodora kindtii—in one system can help describe food web dynamics and inform management decisions. The population densities of these three species were examined in a tannin-stained …
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Juvenile Feeding Ecology and Life History in a Neotropical Primate, the Squirrel Monkey (Saimiri Sciureus)
… and that juvenile foraging primarily reflects predator avoidance as a consequence of having a long prereproductive period. This study examined the foraging ecology of the squirrel monkey, a small, neotropical primate with an unusually long juvenile phase. The feeding behaviors of wild juveniles …
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