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 18 of 18 for “"dung beetle"”.
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Dung beetle radiations in Madagascar
… are dominant on the African mainland. Malagasy dung beetles are dominated by two tribes, Canthonini and Helictopleurina, with more than 250 endemic species. In this thesis I have reconstructed molecular phylogenies for the two tribes using several gene regions and different phylogenetic methods. …
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Tropical Pyramids: Dung Beetle Richness, Abundance, and Biomass
… continuous forest, I found two important trends; beetle biomass and species richness increased with fragment area per sampling effort. Comparing all four studies, diversity increased with fragment size, and by my rarefaction analyses, two studies demonstrated beetle volume increased with fragment …
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Variability in north temperate dung beetle assemblages at different spatial and temporal scales
… examined the spatial and temporal variability of dung beetle assemblages across a variety of scales e.g. from the between-pad scale (examining the effects of dung size and type) to larger spatial scales encompassing southern Ireland. Dung beetle assemblage structure as sampled by dung pad cohort …
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Assessing the effect of habitat, location and bait treatment on dung beetle (Coleoptera: Scarabaeidae) in southern Alberta, Canada
Dung beetles (Coleoptera: Scarabaeidae) are members of the coprophagous insect community and are important dung degraders in pasture ecosystems. To assess their distribution in North America, I created a checklist of over 300 beetle species known to colonize dung (Chapter 2). To assess the affect …
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Climatic change, habitat modification and relative age of dung beetle taxa (Coleoptera: Scarabaeidae, Hydrophilidae, Histeridae, Staphylinidae) in the South-Western Cape
… belt. 3. Pitfall traps baited with cattle dung were used to sample dung beetle fauna over 24h periods once a week in the Transvaal, irrespective .of weather (three traps/site), and on three sunny occasions per month in the south-western Cape (ten traps/site) for one year. 4. A further 13 …
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Benefits of Dung Beetles (Coleoptera: Scarabaeidae) on Nutrient Cycling and Forage Growth in Alpaca Pastures
… in the U.S. since the early 1980s. In pastures, dung beetle activity has been shown to enhance the degradation and incorporation of dung into the soil. The benefits of this activity have been quantified for cattle, but not for alpacas. The objectives of this study were to document the dung beetle …
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Invertebrate mediated biodiversity-ecosystem functioning relationships : lessons from tropical forest dung beetles
… these knowledge gaps by investigating how dung beetle traits and functional diversity influence the secondary dispersal of seeds and the emergence and survival of seedlings in the northeastern Brazilian Amazon. My first research aim was to understand the importance of intraspecific …
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The Causes and Consequences of Community Disassembly in Human Modified Tropical Forest: Scarabaeine Dung Beetles as a Model System
… the community disassembly of Scarabaeine dung beetles in tropical forest, at a variety of spatial scales. I outline the potential for tropical forest defaunation to negatively impact dung beetle communities, summarize the contributions of dung beetles to a range of key ecological …
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THE EVOLUTIONARY ECOLOGY OF HOST-MICROBIOME SYMBIOSIS IN ONTHOPHAGUS DUNG BEETLES
… to address these and related issues using the dung beetle genus Onthophagus. Previous work in this genus has demonstrated that mothers reliably pass to their offspring a conserved group of gut microbes, and that these vertically inherited microbes enhance offspring growth, development, and …
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The effects of dung beetles on ecosystem functioning: From global trends to New Zealand pastures
Dung beetles are amazing. Their diverse nesting behaviours affect a suite of important biotic and abiotic ecosystem processes, or functions. However, the dynamics of these functions across different ecosystems and over time remain largely unknown. This PhD thesis investigates the relationships …
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Characterization of biotic and sodic lawns of the Kruger National Park using the framework of the positive feedback loop / Courtney Moxley
… National Park. We used β diversity in grass and dung beetle community assemblages among the lawns to identify whether sodic and biotic lawns were distinct for grass percent cover and dung beetle species abundance. Four and three categories of lawns were identified for these traits, respectively, …
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Investigating the efficiency of reforestation approaches in restoring rainforest biodiversity and function
… recovery following restoration. Both mammal and dung beetle community composition was clearly progressing towards that of rainforest with increasing restoration age. Restoration increased dung beetlemediated secondary seed dispersal, leaf litter decomposition rates and decomposition …
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How rewilding impacts ecosystem health in a semi-arid region
… soil and vegetation characteristics as well as dung beetle assemblages via megafauna trampling and feeding behaviours, ultimately improving ecosystem health. This was conducted in two different vegetation types, Montagu Shale Renosterveld and Western Klein Karoo. By examining these key …
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The Transformation of Electricity in my Brain
… places as her brain, the life of an African Dung Beetle, the center of an atom and the dark reaches of outer space. The story is inspirational and thought provoking. It will force you to see the world as an interconnected web that weaves your life together with the cosmos. A must read for the …
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Dung beetles eat plants : insights into the nutritional world of Euoniticellus intermedius (Reiche) (Coleoptera: Scarabaeinae)
Dung beetle eggs develop within the finite nutritional environment of the brood ball, which is made using maternally processed animal faeces. It is thought that microbial and gut-derived excretions constitute the major source of N and C for adult dung beetles, while developing larvae, which have …
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The Effects of Three Rodenticides on Nontarget Small Mammals and Invertebrates
… sites in June 1984. Densities of darkling beetles (Coleoptera) in September were significantly reduced with zinc phosphide. Ground beetle and dung beetle (Coleoptera) densities were not immediately reduced by the rodenticides in September. Generally, the few long-term changes in …
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The effects of tropical forest management on biodiversity and ecosystem functioning
… on measures of ecosystem functioning. Dung beetle (Coleoptera: Scarabaeidae: Scarabaeinae) functional group richness and composition were manipulated in a series of field experiments. Certain functional groups and species were found to have a greater impact on ecosystem functioning than …
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The biodiversity and climate impacts of alternative approaches to meeting demands for tropical timber and forest restoration
… data to characterise how the abundance of 57 dung beetle species changes with yield along a harvest intensity gradient in a 50,000 ha Brazilian Amazon logging concession. I then use these abundance-yield relationships, combined with company-reported logging rates, to evaluate the biodiversity …