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 21 for “"Dragonflies"”.
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Heat shock proteins in Mojave Desert dragonflies
Temperature plays a crucial role in the constant interaction between organisms and the environment. It affects development and rates of physiological functions as well as survival of organisms.
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Heat shock proteins in Mojave Desert dragonflies
Temperature plays a crucial role in the constant interaction between organisms and the environment. It affects development and rates of physiological functions as well as survival of organisms.
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Research in motion: patterns of large-scale migration in dragonflies and birds
The work I present here can be broadly described as focusing on the spatial, temporal, and ecological basis to patterns of movement by highly vagile organisms. From this perspective, the differences between chapters are matters of scale: community versus population ecology, and movement by …
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Perch Selection by Male Dragonflies (Odonata, Anisoptera) Related to Competitive Ability and Species Composition
<p>Males of many species of dragonflies (Odonata, Anisoptera) establish territories in aquatic habitats where they compete with other males for access to food and females. Territorial males typically perch on emergent vegetation and chase rival males who intrude into their territories. This …
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Design and prototype of a hovering ornithopter based on dragonfly flight
… bees, wasps and helicopters use this technique. Dragonflies hover using a unique method, by flapping along an inclined stroke plane. This seems to create a higher efficiency than is possible for normal hovering. The aim of this project is to build a mechanical model to mimic the aerodynamic …
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Size-structured competition and predation in red-eyed treefrog tadpoles
… per gram competitors. When predators were added, dragonflies reduced survival and growth of hatchlings substantially, but had no effect on large tadpoles. Further, dragonflies reduced hatchling growth more when other hatchlings were present. The predator effect on hatchling growth was 23% larger …
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Design and Kinematics of a Dielectric Elastomer Actuated Micro Dragonfly Robot
Dragonflies fly in a unique way compared to other hovering insects. Soft robotics are used to learn more about their flapping motion. An at-scale dragonfly robot is designed around Dielectric Elastomer Actuators that compress and expand 0.5mm. With this knowledge, MATLAB was used to predict the …
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Descending premotor target tracking systems in flying insects
… to be optimised for coding efficiency. In dragonflies, a population of eight pairs of bilaterally symmetric Target Selective Descending Neurons (TSDNs) relay visual information about small moving objects from the brain to the thoracic motor centres. These neurons encode the movement of …
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Analysis of Hydric Pine Flatwood Ephemeral Pool Macroinvertebrate and Crustacean Assemblages Along a Temporal and Spatial Gradient From a Hypothesized Colonial Source
… is suggested for future monitoring. Taxa such as dragonflies, damselflies, Caenis sp., Ablabesmyia rhamphe grp., and Zavreliella marmorata could be expected to be indicators of adequate wetland conditions. In the larger wetland areas, the loss of longer-lived species, like the dragonflies and …
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Biodiversity and Phenology of the Epibenthic Macroinvertebrate Fauna in a First Order Mississippi Stream
… eleven species of beetles, five species of dragonflies, one damselfly species and two species of megalopterans, including the hellgrammite, <em>Corydalus cornutus</em>. All of the stoneflies collected were members of the family Perlidae; as later instars perlids are predators on aquatic …
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The Dragonfly Fauna (Odonata:Anisoptera) of a Lentic Habitat in Southwestern Missouri
The adult and larval species of dragonflies found within an area known as Durst Park were collected and studies. The study area consisted of two adjacent ponds (together measuring 1.39 ha), nearby fields, and a flowing stream. Descriptions were made of the adult male, adult female, and larval form …
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Dynamic Mechanical Properties of Resilin
… store and return energy, the resilin tendon in dragonflies does not act to improve the energetic efficiency of flight or as a power amplifying spring. Rather, it likely functions to passively control and stabilize the trailing edge of each wing during flight.
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The potential and promotion of entotourism in Gunung Ledang, Johor, Malaysia
… and visible are ants, butterflies, termites, dragonflies, moths, beetles, cicadas and damselflies. Field trials indicated that these insects were viable attractions as they are readily visible, safe, easily recognizable, with some having linkage to local culture. Regardless of the different …
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The potential and promotion of entotourism in Gunung Ledang, Johor, Malaysia
… and visible are ants, butterflies, termites, dragonflies, moths, beetles, cicadas and damselflies. Field trials indicated that these insects were viable attractions as they are readily visible, safe, easily recognizable, with some having linkage to local culture. Regardless of the different …
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Gregarine parasitism in dragonfly populations of Central Texas with an assessment of fitness costs in Erythemis simplicicollis.
… some have considered gregarines to rarely infect dragonflies. In this study, dragonfly populations were surveyed for gregarines and an assessment of fitness costs was made in a common and widespread host species, Erythemis simplicicollis. Adult dragonfly populations were surveyed weekly at two …
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Investigation on the Mechanisms of Elastomechanical Behavior of Resilin
… obtained with natural resilin from locusts, dragonflies and cockroaches. The resulting master curves show that the synthetic resilin undergoes a prominent transition, though the responsible mechanism is unclear. Possible explanations for the significant increase in modulus include the …
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Neuronal encoding of natural imagery in dragonfly motion pathways
… investigation into several questions about how dragonflies can function in natural environments. More broadly, my thesis addresses general questions about vision and how complicated visual tasks can be solved via clever strategies employed in neuronal systems and their modelled equivalents.
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Visual Adaptations and Behavioural Strategies to Detect and Catch Small Targets
… with a comparable spatial resolution belong to dragonflies, in excess of an order of magnitude larger than Holcocephala. 2. Numerous potential targets may be airborne within the visual range of a predator. Not all of these may be suitable. Chasing unsuitable targets may waste energy or result in …
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