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 64 for “"native fish"”.
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Small water, big potential: farm ponds and their potential for native fish conservation
… are often overlooked as potential habitat for native species despite their ubiquity across many human altered landscapes. Farm ponds intermittently connect to streams during floods allowing species exchanges to and from these novel habitats. In 2014, a farm pond on Tallgrass Prairie National …
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Differentiating the effects of two non-native fish in the Turnbull National Wildlife Refuge
… to determine the individual effects of two non-native fish, the brook stickleback, Culaea inconstans, and pumpkinseed, Lepomis gibbosus, on the aquatic invertebrates and food webs of Turnbull National Wildlife Refuge (TNWR). Ten ponds were analyzed and compared with stable isotope analysis and …
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Effects of Trout Introduction on Community Assemblage and Behavior of Native Fish in the Missouri Ozarks
… the effects of trout introduction on native fish. Fish communities were sampled in the fall of 2013 to assess potential impacts of trout introduction on community assemblage and behavior of native fish. An index of biotic integrity (IBI) was used to compare assemblages between sites of …
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Characterizing the trophic niche of non-native psedorasbora parva and the consequences for native fish communities.
Introductions of non–native fish can be a key driver of environmental change that has major implications for biodiversity and ecosystem functioning, including the adverse consequences of increased inter-specific competition for native fishes. Here, the consequences of an introduction of a model …
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The capacity of native fish and a freshwater mussel species to control suspended solids in wastewater stabilization ponds
… wastewater treatment. The capability of several native fish species and the freshwater mussel, <i>Elliptio complanata</i>, to reduce suspended solids and phytoplankton was compared in laboratory and field enclosure experiments. Fathead minnows (<i>Pimephales promelas</i>), gizzard shad …
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Population crash of an endemic South African cyprinid: the role of non-native fish, drought and other environmental factors
Native freshwater fish are in decline worldwide due to human impacts including impoundment, changes to water quality, over-abstraction, climate change and the introduction of non-native species. South Africa's Cape Fold Ecoregion (CFE) harbours exceptionally high freshwater fish endemism, yet the …
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Influences of watershed urban development on habitat heterogeneity and native fish diversity in a ridge and valley stream in Southeastern Tennessee
… with instream environmental conditions and fish assemblage attributes in a third-order Ridge and Valley stream in the Chattanooga, Tennessee area. Stream water quality, habitat, and fish assemblages were sampled in May-June 2005 at seven sites (drainage areas <17 km2) in the Mountain Creek …
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A preliminary investigation of the potential effects of the invasive Mozambique tilapia Oreochromis mossambicus on the native fish assemblages of Lake MacLeod, Western Australia
… mossambicus) is likely to have an effect on the native fish communities of Lake MacLeod, a unique and important inland, saline lake system in north-western Western Australia, through competition for key resources, namely habitat and food sources. Seven study sites were selected within the …
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The thermal tolerances and preferences of native fishes in the Cape Floristic Region: towards understanding the effect of climate change on native fish species
… levels of endemism. This includes its freshwater fish assemblage. Whereas the current greatest threats to native fish biodiversity are habitat degradation and invasion by non-native species, predicted climate change is likely to further impact fish communities negatively. As a master abiotic …
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Field and laboratory studies suggest that recruitment of the invasive common carp is controlled by native fish in Stable Lakes of the Upper Mississippi Basin.
… an ecological disturbance that alters the fish community. It has been hypothesized that recruitment of carp is limited by native predatory fish and that carp are only able to recruit in habitats where these native species have been excluded due to winter hypoxia. We tested this hypothesis …
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Conservation of the native freshwater fishes of the Cape floristic region (South Africa) : management of non-native species
Freshwater fishes are among the most threatened taxa in the world. Increasing demand for freshwater, habitat degradation and the introduction of non-native species, will continue to place pressure on the remaining native freshwater fishes. A meta-analysis estimated that more than 90% of river …
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Recreational disturbance of a desert stream fish community: Detecting ecological effects of environmental impact
Fish assemblages in 22 pools were sampled over the summer of 1997 in the North Fork of the Virgin River, Zion National Park, Utah, to assess effects of recreational activities on native fish communities. Pools experiencing high levels of wading and float tubing contained altered population …
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Opportunities and Constraints of Sierra Nevada Meadow Restoration for the Mountain Yellow-Legged Frog Species Complex
… most scientific efforts for MYLF, such as non-native fish removal and research on disease dynamics, are being conducted at high-elevation habitats. The purpose of this literature review was to evaluate the potential opportunities and constraints of wet meadow restoration for MYLF. An evaluation …
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Native New Zealand fish: lethal and sublethal effects of pentachlorophenol on early and adult life stages
The sensitivity of four New Zealand freshwater fish species to 99.5% pure pentachlorophenol was studied. For one part of the study, four early life stages of smelt (Retropinna retropinna), inanga (Galaxias maculatus), koaro (Galaxias brevipinnis), and common bully (Gobiomorphus cotidianus) were …
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Exploring Fish Diversity as a Determinant of Ecosystem Properties in Aquatic Food Webs
… the effect of common carp across a gradient of fish richness in mesocosms. The invader reduced native fish production and the effect was reduced with increasing fish richness. The invertebrate community was modified by a top-down effect from the richness treatment, whereas the invader had a …
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Effects of interspecific competition, salinity, and hurricanes on the success of an invasive fish, the Rio Grande cichlid (Herichthys cyanoguttatus)
… at least 20 years. It is often the most common fish species in urban canals and has also been found in natural waterways outside of the GNOMA. The effects and potential for further spread of H. cyanoguttatus is uncertain. My research addressed how extensive the cichlids spread in the GNOMA, how …
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Between a bass and a hard place: the fragmented distribution of an endangered redfin in the Heuningnes River System of the Cape Fold Ecoregion
Native freshwater fish are globally in decline due to anthropogenic impacts, including changes to water quality, over-abstraction, climate change, and introduction of nonnative species. The Cape Fold Ecoregion (CFE) of South Africa is recognised as a hotspot for freshwater fish endemism. It is also …
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Spatial models of Hawaiian streams and Hawaiian stream fish habital
… based models of Hawaiian streams and stream fish habitats were developed to aid in the conservation of native fishes. The spatial models focused on the quantification of habitat for native fishes at three levels within a spatial hierarchy. First, at the reach level, the models classified the …
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Assessing the Live Bait Industry and the Ecological Status of Invasive Cyprinodontiformes (Sheepshead minnow: Cyprinodon variegatus and Gulf killifish: Fundulus grandis) in Texas Streams
… often cause irreversible ecological damage on native communities. Here, I investigated the pathway of introduction and ecological impacts of the sheepshead minnow (<em>C. variegatus</em>) and the gulf killifish (<em>F. grandis</em>). Both species were thought to have been introduced into inland …
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Impacts of non-native rainbow trout on stream food webs in the Cape Floristic Region, South Africa integrating evidence from surveys and experiments
… predators may be influenced by whether or not native predators which function in the same way as the invasive predator exist in the recipient system. Impacts are expected to be strong in isolated systems lacking functionally similar predators because native species will be naïve to the foraging …
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