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 109 for “"pheromones"”.
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The chemical diversity of midge pheromones
… valuable agricultural crops. The female sex pheromones of several midge species have been identified and the hypothesis was that midge sex pheromones could be chemically more diverse in structure than previously thought. This hypothesis was tested in the context of four midge species of …
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The behavioural function of pheromones in crayfish
… however the chemical identity of crayfish pheromones is unknown. An incomplete understanding of chemical communication has delayed progress in the development of appropriate bioassays. This thesis therefore focused on researching the natural context of chemical signalling by crayfish, …
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Pheromones in Heliconius butterflies: Chemical ecology, genetics, and behaviour
Sex pheromones are chemical signals that mediate communication between males and females of a species and are important for mating. They have been well-studied in female moths, where females release volatile compounds to attract males over long distances. Butterflies fly during the day and were …
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Pheromones in entomopathogenic nematodes: effects on dispersal and reproductive behaviours
… overall project aim is to explore the role of pheromones in coordinating a variety of important behaviours in entomopathogenic nematodes, particularly Steinernema, both as primers (longer term developmental effects) and releasers (short term behavioural effects). I investigate both sex …
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Pheromones, nectar, and computer vision: investigating large-scale patterns of chemodiversity.
At its core, chemical ecology attempts to describe the complex forces that generate the vast chemical diversity observed in nature and which allow natural products to mediate interactions across biological scales. Chemodiversity is a major component of functional biodiversity in all ecosystems, and …
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Evolution and Taxonomic Distribution of Volatile Pheromones in Cerambycine Longhorned Beetles
Volatile sex or aggregation pheromones play an important role in mate location in many groups of insects. The lack of variation in these pheromone communication systems among the best studied groups has hindered understanding of the evolution of volatile pheromone use in insects. The diverse beetle …
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Insect pheromones : the sex pheromone of Nudaurelia cytherea cytherea Fabr. : (Lepidoptera : Saturniidae)
Studies leading to the isolation, identification and synthesis of the sex pheromone from the female pine tree emperor moth Nudaurelia cytherea cytherea Fabr. (Lepidoptera : Saturniidae) are described.
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The Role of Alarm Pheromones in Predation Avoidance By Adult Central Newts, Notophthalmus Viridescens
Alarm pheromones play an important role in predator/prey interactions. A chemical alarm system has been recently described for Notophthalmus viridescens. This alarm signalling system was tested in the field to determine if newts avoid areas marked with conspecific skin extract in a natural …
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HPLC method development for the evaluation of pheromones from the dwarf African clawed frog Hymenochirus
<p>This research project is an ongoing project in collaboration with colleagues in the Department of Biology at the University of the Pacific. The main purpose of this project was to separate and identify the female-attracting substance secreted by male frog by developing chromatography methods for …
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Transgenic Tools in Ants and the Representation of Alarm Pheromones in the Ant Antennial Lobe
… and discriminating between vast numbers of pheromones. The discovery of additional developmental differences between ants and flies led to a proposed but untested model where ant olfactory sensory neurons target the appropriate antennal lobe compartment via receptor dependent activity, as …
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Blending synthetic pheromones of cerambycid beetles to develop trap lures that simultaneously attract multiple species
… beetle species to blends of known cerambycid pheromones to determine whether such blends could be used as effective trap lures for detecting and monitoring multiple species simultaneously. Pheromone-baited traps captured 1,358 cerambycid beetles, of which 1,101 (81.1%) belonged to three …
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Insect pheromones : the synthesis of the sex pheromone of Cryptoplebia leucotreta Meyr. and related compounds
The concept of pheromones is briefly expounded leading on to a discussion of the identified sex pheromones in the order Lepidoptera. The relationship between the structures Of these compounds and their biological activity is reviewed. A brief introduction to the sexual biology of tbe false codling …
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Behavioural responses of cocoa mirids, Sahlbergella singularis Hagl and Distantiella theobroma Dist. (Heteroptera: Miridae), to sex pheromones.
… on the behavioural responses of the mirids to pheromones in traps, parameters were standardised for efficient performance of the traps. A range of five blends of the synthetic pheromone, the diester, hexyl (R)-3- ((E)-2-butenoyl)-butyrate and the monoester, hexyl (R)-3-hydroxybutyrate, …
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The Influence of Chirality on the Behavioral Responses of Longhorned Beetles (Coleoptera: Cerambycidae) to Volatile and Contact Pheromones
… of longhorned beetles to volatile and contact pheromones. Structures of pheromones in the longhorned beetles generally fall along taxonomic lines, and various structural modifications such as functional groups and stereochemistry are used to grant species spcecificity to these signals. Effects …
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Using a generic blend of pheromones to simultaneously attract a diversity of elaterid beetle species native to eastern North America
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01
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Chemical communication and its ecological consequence in the Lysmata shrimp
… Mate recognition depends mainly on sex pheromones, which are detected by antennae and antennules. Distance (soluble)pheromone mediates mating behaviour of some decapod crustaceans. Contact pheromone (an insoluble coating on the body surface) has been proposed but not confirmed to be used …
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Use of sensory information by cerambycids and their natural enemies to locate resources and mates
… hypothesized that parasitic Hymenoptera use the pheromones of cerambycids as kairomones to locate potential hosts. I tested this hypothesis by baiting sticky traps with known pheromones of cerambycids over two field seasons. Ten species of parasitoids significantly responded to pheromones of …
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Pheromone chemistry and reproductive isolation in the subfamily Lamiinae (Coleoptera: Cerambycidae)
… components, even having identical attractant pheromones. For example, many cerambycines native to different continents use pheromones composed of hydroxyalkanones and related alkanediols. Avoidance mechanisms of interspecific attraction in cerambycines that share pheromone components include …
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Assessing the behavioral response of Westslope Cutthroat Trout to olfactory cues in a two-choice Y-maze
… tested in this study were population-specific pheromones produced by WCT from the same population, conspecific pheromones produced by WCT from the second population, and water obtained from each population’s natal stream. The water Kings Lake WCT were reared in for one year at the Spokane …
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