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 16 of 16 for “"Trophic Cascade"”.
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The effect of recreational fishing on targeted fishes and trophic structure, in a coral reef marine park
… to overfishing. These same fishes play a role in trophic structure by regulating prey species. Despite increasing numbers of fishers, few studies have investigated the potential effects of recreational fishing on fish populations and subsequent trophic effects. This project investigated whether …
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Spring Phenology and Trophic Ecology of Trees, Caterpillars, and Migrating Neotropical -Nearctic Songbirds
I investigated the trophic ecology of forest trees, caterpillars, and wood warblers (Parulidae) and vireos (Vireonidae) during spring migration in 2001--2003 at Trelease Woods, a deciduous forest fragment near Urbana, Illinois, USA (40°09'N, 88°10'W). I hypothesized that (1) the …
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Bioaccumulation of Triclocarban, Triclosan, and Methyl-triclosan in a North Texas Wastewater Treatment Plant Receiving Stream and Effects of Triclosan on Algal Lipid Synthesis.
… nutrient value. If consumer growth is limited, trophic cascade strength may be affected and serve to limit population growth and reproduction of herbivores in these riparian systems.
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The effects of heuweltjies and Microhodotermes viator (Isoptera: Hodotermitidae) on invertebrate assemblages and species turnover in the succulent Karoo, Western Cape
… emerging from the frass, suggesting a trophic cascade. Invertebrates commonly associated with M. viator were found more commonly on the heuweltjies. The Jaccard distances indicated that environmental homogenisation of the heuweltjies resulted in homogenisation of the on-mound …
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Age, Growth, Mortality, and the Effects of Trawling on Mortality of the Longspine Porgy, <i>Stenotomus caprinus</i>
… high rate of bycatch on other species through trophic cascade or bottom-up effects.</p>
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Does tree size matter? : giraffe influence on African savanna ecosystem properties
… nitrogen and soil carbon. The consequence is a trophic cascade of events from increased giraffe decreasing fires and in tum increasing tree density and hence carbon sequestration. As giraffes replace a single large tree by several small trees, shows that their population size is key determinant …
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Effective monitoring techniques for carnivores and the role of a dominant mesocarnivore in structuring the carnivore community
… without an apex predator, pumas caused a clear trophic cascade, suppressing coyotes and releasing the smaller mesocarnivores. Conversely, coyotes only suppressed the smaller carnivores by some measures and had overall weaker effects than pumas. My analyses highlight the importance of focal …
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Impacts of elk management and riparian condition on songbirds in Rocky Mountain National Park
… Park (RMNP) are declining as a result of a trophic cascade involving the local extinction of wolves (Canis lupus) and an exponential increase in elk (Cervus elaphus). In 2008, RMNP began installing elk exclosures to protect and restore willow communities and the diverse taxa that depend on …
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Foraging ecology of two piscivores in woody habitat and effects of their introduction on lake ecosystems
… populations. While the evidence for such “trophic cascades” is plentiful, a large body of subsequent research has suggested that certain properties of lakes found in lower latitude systems in the central and southern United States may buffer these systems from cascading effects of piscivore …
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Modeling economies and ecosystems in general equilibrium
… an invasive species and a harvesting-induced trophic cascade - by mimicking key features of these phenomena. The BGE model's micro-founded dynamics, the stability and robustness of its results, and its validity against real-world phenomena offer a unique and valuable contribution to ecosystem …
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Ecosystem impacts of the invasive rusty crayfish (Faxonius rusticus) over time
… be a positive driver of water clarity through a trophic cascade or may respond to changes in water clarity as benthic resources are either increased or decreased. In my second chapter, I used a long-term dataset (1987, 2002, 2011, and 2020) of crayfish, macrophytes, and snails in ten F. …
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The importance of predator behaviour on risk to prey
… risk, a within community behaviourally-mediated trophic cascade may occur. where the risk to prey is driven by their predators' own perceived risk of predation. This shows that optimal foraging decisions under the threat of predation, as well as perceptual constraints, can mediate the effect of …
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Nahrungsnetzbewirtschaftung in Mittelgebirgstalsperren
… lake types, covering a range from oligo-/mesotrophic to eutrophic. Although changing the fishery management only by repeated fish stocking, in combination with implementating size and bag limits for recreational fisheries, is thought to have only limited success, we decided to put this type of …
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The Fate and Effects of Contaminants in Estuarine Environments
… human health issues when seafood is consumed. Eutrophic water can generate blooms of macroalgae and can induce adverse changes in the structure of an entire food web. Environmental research is of fundamental importance to understand the sources, fates and effects of contaminants. It will permit …
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Ecosystem Functional Consequences Of Body Size Variation In An Apex Predator (Ambystoma jeffersonianum)
… ecosystem functioning. We sought to characterize trophic cascades initiated by larval populations of Ambystoma jeffersonianum that varied in size structure based on diversity of maternal lines (i.e., sibship diversity) by quantifying the effect on larval salamanders, benthic macroinvertebrates, …
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Ecosystem Functional Consequences of Top Predator Mortality Due to the Invasive Shrub, Lonicera maackii
… diversity may have served as a buffer for lower trophic levels, such that they were not affected when A. maculatum individuals were eliminated from mesocosms due to exposure to L. maackii phenolic compounds. The results of this study will help complete the overall picture of the possible …