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 47 for “"Stream Fish"”.
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Effects of Avian Predators on Stream Fish Assemblages
… chapter focuses on foraging behavior of kingfishers and great blue herons, and shows that netting and perches can be used to successfully manipulate avian predation pressure. The third chapter uses this technique to examine what effects kingfishers and wading birds are having on stream fish …
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A mechanistic framework for understanding prairie stream fish distributions
… community composition among sub-basins, but in-stream and catchment predictors become stronger correlates of community composition with increasing spatial extent. Third, I used environmental niche models to quantify distributions of four pairs of congeneric cyprinids and found that species …
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Spatial models of Hawaiian streams and Hawaiian stream fish habital
A series of spatially 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 …
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Land use drives the physiological properties of a stream fish
… alter the abiotic properties of watersheds and stream reaches, potentially resulting in abiotic conditions that are stressful for resident fishes. The inability of fish to cope physiologically with stressful abiotic conditions can have deleterious effects on individuals, and could potentially …
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The Effect of Isolation by Waterfalls and Dams on Stream Fish Morphology
<p>Large dams with upstream reservoirs can cause divergent selection in fish morphology; however, the effect of isolation from small dams without upstream reservoirs is largely unknown. This study investigated the effects of isolation on stream fish body morphology and the related effect of …
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How climate change and agriculture could reshape the midwestern stream fish communities
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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A quantitative evaluation of environmental enrichment for stream fish at the Tennessee Aquarium
… behaviors, and reduce maladaptive behaviors in fishes. I evaluated seasonal mimicking as environmental enrichment in the Tennessee Aquarium’s Ridges to Rivers stream tank. I quantified behaviors of tangerine darters and Tennessee dace in response to increasing temperature. If seasonal mimicking …
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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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The Role of Physiography in the Relationships Between Land Cover and Stream Fish Assemblages
… land use has been linked to the degradation of streams and stream biota. Natural physical and climatic characteristics, or physiographic template, are important for determining natural land cover and constraining human land use, and are strongly related to stream habitat and stream biotic …
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Friends in Low Places: Responses of a Benthic Stream Fish to Intra-Guild Alarm Cues
… Darters (Etheostoma caeruleum) are benthic fish that co-occur with native Ozark Minnows (Notropis nubilus), recently-introduced Western Mosquitofish (Gambusia affinis), and native Oklahoma Salamanders (Eurycea tyrnerensis), all of whom are vulnerable to the same predators. We tested the …
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Patterns of Taxonomic, Functional, and Phylogenetic Diversity, and Ecological Drivers of Stream Fish Assemblages in East Texas
… supporting some of the greatest freshwater fish diversity in the state. Given the heterogeneity of habitats and species diversity, these rivers serve as excellent natural systems for examining the ecological processes shaping biodiversity patterns and species distributions. In 2023-2024, 60 …
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The impacts of voluntary private lands programs on stream fish diversity in the Kaskaskia River Basin, Illinois
Freshwaters support over 40% of fish species diversity, as well as one-third of all vertebrate species, yet remain one of the most threatened habitats globally. Anthropogenic disturbances have caused many negative impacts throughout history, and continue to do so today. After the dust bowl we began …
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Temporal trends in stream-fish distributions, and species traits as invasiveness drivers in New River (USA) tributaries
… invasion chronologies based on a historical fish presence data set for upper and middle New River (UMNR) tributaries. Our framework accounts for spatiotemporal variability in sampling effort by aggregating presences by watershed and expressing range size as a function of the number of …
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Effects of Sampling Sufficiency and Model Selection on Predicting the Occurrence of Stream Fish Species at Large Spatial Extents
… species occurrence. Predicting the occurrence of stream fishes is often difficult because sampling data insufficiently describe species occurrence and important environmental conditions and predictive models insufficiently describe relations between species and environmental conditions. This …
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Fish Community Assembly At Multiple Spatial Scales In East Texas Streams
<p>Stream communities are structured by environmental processes that vary in strength across different spatiotemporal scales. Therefore, revealing how stream fish communities are influenced by environmental gradients may clarify how communities respond to disturbance associated with anthropogenic …
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Relative Roles of Environmental Conditions and Riverscape Connectivity On Fish Metacommunity Structure
… conservation management and restoration of fish communities in dendritic river networks. This study investigates the relative roles of abiotic conditions and spatial factors in structuring stream fish communities and aims to enhance scientific understanding of these structuring factors by …
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Evolutionary and Ecological Patterns of Body Size in North American Freshwater Fishes
… about the ecology of North American freshwater fishes, few studies have incorporated phylogenetic information into analyses of ecological and biogeographic data. Consequently, little attention has been given to the relationship between evolutionary trends, and regional and local community …
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Applying ecological models to positive interactions among lotic fishes: implications for population and community regulation at multiple spatial scales
… positive interactions is particularly evident in stream ecosystems and in vertebrate communities. Stream fishes clearly provide an ideal system for advancing research on positive interactions. Many minnows (Cyprinidae) of eastern North America engage in a potentially mutualistic reproductive …
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Nutritional condition and stress response of fishes along a gradient of habitat quality in the St. Lawrence River: physiological consequences of anthropogenic habitat degradation
… that flow through disturbed landscapes. These in-stream changes can alter aquatic population size and community structure; however, the underlying causal mechanisms remain poorly understood. Although patterns in population size presumably reflect underlying variation in organismal health and …
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Streams in a changing landscape : identifying candidate reference reaches to assess the physical and biotic integrity of Missouri's wadeable streams
… landscape alterations, with many present-day stream fish and aquatic invertebrate communities representing only a fraction of their historic constituents. Consequently, resource managers need the ability to predict areas of high and low biological integrity to inform management decisions and …
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