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 “"multitrophic"”.
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Multitrophic Interactions in a Prairie Insect Community: Ecology, Behavior, and Conservation
"Tallgrass prairies used to dominate the midwestern United States, but have been reduced to <0.01% of their original pre-settlement area. The plant communities of this ecosystem are relatively well known and appreciated, but little is known of the biology of most insects that are endemic to prairie …
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Cell line development and multitrophic aquaculture of the lined seahorse, Hippocampus erectus
… and tissue culture infectious dose titers. Multitrophic recirculation aquaculture systems (MRAS) were developed to reduce disease and labour and to improve economic benefit by simulating natural environments using integration of Gracilaria, Caulerpa macroalgae, and Lysmata wurdemanni shrimp. …
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Spatiotemporal patterns of insect diversity and multitrophic interactions across a tree diversity gradient
Während des letzen Jahrzehnts ist der Zusammenhang zwischen Biodiversität und Ökosystemfunktionen bzw. -dienstleistungen, wie z. B. Bestäubung oder biologische Schädlingskontrolle, ins Zentrum ökologischer Forschung gerückt. Vor allem Verlust von Biodiversität durch anthropogen bedingte Störung und …
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Functional diversity enhances detection of ecosystem stability and resolution of predator-prey interactions within a multitrophic community
… and detect ecological stability mechanisms in a multitrophic community consisting of longhorned beetles and their beetle predators. I also considered predator-prey interactions between beetles and their insectivore avian predators at the community level.</p> <p>To meet my objectives, I developed …
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Assessing the drivers of adaptive radiation in a complex of gall midges: A multitrophic perspective on ecological speciation
Natural enemies as selective forces maintaining and shaping morphological, physiological, and behavioral divergence in adaptive radiations have received very little attention. Until recently, the focus has been on primary resource competition as a major driver of trait divergence in adaptive …
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Host range and multitrophic interactions between the parasitoid Cotesia vanessae (Hymenoptera: Braconidae) and Noctuidae (Lepidoptera) hosts in North America
Caterpillars in the family Noctuidae are important crop pests. After discovering the parasitoid Cotesia vanessae in the Nearctic region, which was previously only known from the Palearctic and Afrotropic regions, I investigated its fundamental host range on North American Lepidoptera and found that …
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The impacts of century-old, arsenic-rich, mine tailings on multitrophic level biological assemblages in lakes from the Cobalt, Ontario, Canada region
The combination of silver mining and lack of environmental regulations in the early 1900s resulted in a legacy of century-old, arsenic-rich mine tailings around Cobalt, Ontario, Canada. In order to examine the impacts that arsenic has had on aquatic ecosystems in the region, diatom, cladoceran, …
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The Direct and Indirect Effects of Insectivory by Birds in Two Neotropical Forests
… that broad generalizations about the outcome of multitrophic interactions are inappropriate for tropical forests, where environmental heterogeneity is great.
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Linking plant traits and herbivory in grassland biodiversity-ecosystem functioning research
… there has also been a call for advancing the multitrophic view of biodiversity- ecosystem functioning. Here I propose a trait-based framework to merge plant-herbivore interactions with biodiversity-ecosystem function relationships. This framework links plant growth and defense strategies, …
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Molecular characterisation of the bacterial communities in cabbage aphid (Brevicoryne brassicae) and their associated fitness effects
… can influence aphid fitness and the truly multitrophic nature of cabbage aphid population dynamics in arable systems are highlighted by this study.
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The effects of dung beetles on ecosystem functioning: From global trends to New Zealand pastures
… offering potential advantages for multitrophic diversification. Overall, the findings of this thesis have positive implications for nature-based management, offering promising prospects for fostering self-sustaining agroecosystems that can benefit future generations.
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Invertebrate mediated biodiversity-ecosystem functioning relationships : lessons from tropical forest dung beetles
… context (Chapter 3). Finally, I explored the multitrophic significance of findings from Chapter 3 by testing how dung beetle communities affect the burial of different sizes of seeds and emergence and survival of seedlings (Chapter 4). Results from this chapter demonstrate how dung beetles …
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Investigating drivers of cyanobacterial blooms in Aotearoa – New Zealand lakes using sedimentary ancient DNA
… in Lake Pounui for Chapter 5, which explored multitrophic changes in Lake Pounui over the last c. 1,000 years. In addition to pollen, charcoal, and 14C dating, XRF scanning was used to reconstruct mineralogic shifts from the catchment (Ti/inc, K/inc) and within the lake (inc/coh). Biological …
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Microorganisms associated with ulva grown in abalone effluent water: implications for biosecurity
… as a biofilter and feed within an integrated multitrophic aquaculture (IMTA) system along with the abalone Haliotis midae by assessing the bacterial communities associated with Ulva and its environment. Water and Ulva samples were collected from an integrated abalone farm along the Western …
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The feasibility of a commercial-scale recirculating aquaculture system integrating sea urchins (Tripneustes gratilla) and seaweed (Ulva)
… for a land-based recirculating Integrated MultiTrophic Aquaculture (IMTA) system. This IMTA system is suggested to be sustainable and efficient, primarily because the Ulva would simultaneously provide bioremediation of effluent and a substantial feed source for T. gratilla. While evidence …
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WOODLAND CARIBOU AS ECOLOGICAL DRIVERS OF FIR WITCHES' BROOM INFECTIONS ON THE SLATE ISLANDS
<p>Woodland caribou herbivory on The Slate Islands altered the forest landscape and ground flora resulting in the emergence of the rust fungi, <em>Melampsorella caryophyllacearum</em>. This rust alternates between chickweeds and balsam fir, where it causes a broom deformity. My study identified …
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Effetti del cambiamento climatico sulle interazioni tra mosche bianche e i suoi parassitoidi, i suoi endosimbionti e la pianta ospite
Gli aleirodidi sono insetti succhiatori di linfa responsabili di elevate perdite economiche. Essi colonizzano centinaia di specie vegetali e causano notevoli perdite all'agricoltura mondiale, sia per danni diretti che arrecano nutrendosi della linfa delle piante, sia per la trasmissione di virus …
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Interazioni tra insetti vettori - piante ospiti - microrganismi fitopatogeni - nemici naturali in Hemiptera Aleyrodidae, vettori di virus fitopatogeni, per rafforzare il controllo ecocompatibile di importanti malattie nelle colture orticole
Nel contesto agricolo, dove si verificano complesse relazioni tra gli organismi e il loro ambiente circostante, tutti i componenti coinvolti non possono essere considerati singolarmente poiché notevolmente dipendenti gli uni dagli altri. Le piante costituiscono l'elemento centrale di molte reti …