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 906 for “"Predators"”.
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Undercover predators: Vegetation mediates foraging, trophic cascades, and biological control by omnivorous weed seed predators
… inputs. Vertebrate and invertebrate seed predators destroy a large percentage of weed propagules on the soil surface, and their ecosystem services may ease labor requirements for farmers in herbicide-free systems. Cover provided by living vegetation is an important predictor of seed …
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Breeding Jackass Penguins as pelagic predators
The foraging of breeding Jackass Penguins Spheniscus demersus was studied in and around southwestern Cape Province, Saldanha Bay (33⁰ S, 18⁰ E), South Africa. Penguins are difficult to observe at sea. Hence, I devised a number of new techniques for studying the foraging behaviour of Jackass …
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Interacting populations : hosts and pathogens, prey and predators
… the interaction at the expense of the other. Predators kill their prey instantly and use it only for food, whereas parasites use their hosts both as their habitat and their food. I am particularly interested in microbial parasites (including bacteria, fungi, viri, and some protozoans) since …
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Biological control of Culex mosquitoes using multiple predators
… by dyed environments, the use of pond dye and predators in combination could promote population sink effects. I also propose the use of calanoid copepods in vector control for the first time, and demonstrate their efficacy in field-based trials that target container-based aquatic environments …
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Effects of Avian Predators on Stream Fish Assemblages
… facilitation occurs between avian and aquatic predators, resulting in more prey being consumed when both predators are together than expected based upon the number of prey each prey consumes in isolation. The last chapter shows that both birds and bass produce non-lethal effects on prey habitat …
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Interacting populations : hosts and pathogens, prey and predators
… the interaction at the expense of the other. Predators kill their prey instantly and use it only for food, whereas parasites use their hosts both as their habitat and their food. I am particularly interested in microbial parasites (including bacteria, fungi, viri, and some protozoans) since …
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Predators vs. Prey: The information ecology of warning signals
… to have a high initial predation cost before predators learn to avoid them. Most previous work has assumed that predators need to sample prey individually (personal information) to learn about these defences, however recent research suggests that observing predation events of others (social …
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Biological and Agronomic Aspects of Two Insect Predators of Switchgrass
<p>Switchgrass (Panicum virgatum L.) is considered a potential model for an alternative fuel source in North America. Recently, two insect pests of switchgrass have been identified. The switchgrass moth [Blastobasis repartella (Dietz): Lepidoptera: Coleophoridae] feeds in the basal internodes and …
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Daphnia Diel Vertical Migration and Chemical Cues from Fish Predators
… may be controlled in part by exposure to fish predators. Daphnia should show greater amplitude DVM in the presence of predators. Daphnia behavioral responses to light and fish chemical cues were examined through experiments in an apparatus containing four acrylic tubes (100cm x 4.5cm). Passing …
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The glass machinery in Christopher Dewdney's Predators of the adoration
… collection of poetry, prose, and visual art, Predators of the Adoration: Selected Poems 1972-82 . Employing a strategy of repetition, association, and layering, Dewdney explores the workings of "the glass machinery," a complex, all-encompassing, metaphorical symbolic system that imitatively …
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The Ecology of Large Marine Predators in the Hauraki Gulf
… Knowledge gaps exist for many large marine predators, who are often rare, difficult to study, and of high conservation concern. The Hauraki Gulf, New Zealand, is a trophic hotspot that supports a diverse range of large marine predators, yet most of the existing research pertains to …
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Influence of reef-associated predators on adjacent soft-sediment communities
… been suggested to be caused by reef-associated predators. A large-scale mensurative experiment was used to investigate the distribution of two size classes of macrofauna with distance from the reef edge across three locations in northeastern New Zealand. The role of reef-associated predators, …
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Predators alter host-parasite interactions via trait-mediated indirect effects
Predators directly interact with their prey. These direct interactions can indirectly alter the interactions between prey and other community members. For example, predators can alter prey life history, behavior, or morphology resulting in an indirect change in the interaction between their prey …
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Predatory and Mutualistic Interactions between Freshwater Minnows and their Predators
… between chubs, nest associates, and their predators. In Chapter 1, I observe spawning nests to identify the predators of adult chubs, nest associates, and embryos. I further investigate how nest visibility covariates including minnow activity, minnow abundance, nest size (area), and nest …
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Response Of Salamanders To Chemical Stimuli From Predators In Natural Habitats
Prey often respond to predators by either fleeing or freezing (remaining immobile). Fleeing rapidly removes the prey from danger while freezing can help the prey escape detection. Very few studies have tested response of salamanders to chemical stimuli (Kairomones) from predators under natural …
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Managing wet grassland landscapes: impacts on predators and wader nest predation
… thesis, I assess the distribution of mammalian predators and their small mammal prey in a landscape managed for breeding waders within lowland wet grasslands, and use these findings to consider the potential for habitat management to reduce levels of nest predation for lapwing, Vanellus …
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Agroecosystem management strategies and trophic interactions among herbivores, pathogens and predators
… on maintaining populations of parasitoids and predators. However, pathogens represent key mortality factors in the regulating pest populations in crops. The maintenance of indigenous plants aiming to increment populations of predators and parasitoids, may also promote the preservation of …
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Information use in anurans: how conspecifics and predators influence reproductive decisions
The student, Valerie Buxton, submitted this Dissertation for approval on 2017-03-24 at 10:47.
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