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 33 for “"Spawning habitat"”.
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Multi-scale hydrogeomorphic influences on bull trout spawning habitat in snowmelt-dominated headwater streams
… size (D16, p=0.01; D50, p=0.02, D84, p=0.02). Spawning reaches exhibited high streambed horizontal and vertical hydraulic conductivities, and streambed temperatures were dominated by stream water diurnal cycles to a depth of at least 25 cm. Groundwater provided substantial thermal moderation of …
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Multi-scale hydrogeomorphic influences on bull trout spawning habitat in snowmelt-dominated headwater streams
… size (D16, p=0.01; D50, p=0.02, D84, p=0.02). Spawning reaches exhibited high streambed horizontal and vertical hydraulic conductivities, and streambed temperatures were dominated by stream water diurnal cycles to a depth of at least 25 cm. Groundwater provided substantial thermal moderation of …
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Mimicking Nature: How water level management on a large reservoir affects walleye (Sander vitreus) spawning habitat
… the effects of the rule curves on walleye spawning, I modeled wave energy, ice scour, and habitat availability at 44 spawning locations. Wave energy increased (18% for observed water levels, 6% for modeled water levels) and ice scour decreased 11% (both P < 0.01) over spawning habitat …
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Comparison Of Spawning Habitat And Nest Density Between Buck Darter (etheostoma Nebra) And Striped Darter (etheostoma Virgatum) Populations In The Cumberland River Drainage, Kentucky
… makes it important to understand the Buck Darter spawning habits and nesting habitat. Thus, my study objectives were to compare populations of established and introduced Buck Darters and determine differences in spawning habitats, conductivity, and effects of temperature on timing of spawning and …
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Identification and Genetic Diversity of Lake Sturgeon Larvae on Artificial Reefs in the Huron-Erie Corridor
… ice sheet. Lake sturgeon have seen immense habitat loss due to human development and industrialization has nearly decimated populations. Changes to water and habitat quality, along with overharvesting, have caused declines to nearly 1% of their original population size. The Huron-Erie …
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Understanding the impacts of exploitation and fragmentation on the upstream migrating, adult river lamprey (Lampetra fluviatilis [L.]): implications for conservation
… fragmentation and exploitation on the upstream spawning migration of river lamprey in the Humber catchment by carrying out fish tracking studies across three consecutive years (2018/19 to 2020/21) in the two main tributaries to the Humber Estuary: Yorkshire Ouse (2018/19 and 2019/20) and Trent …
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Food, Growth, and Reproduction of White Crappies (Pomixis Annularis) and Black Crappies (P. Nigromaculatus) in Lake Poinsett, South Dakota
… decline appeared to be due to a lack of spawning habitat caused by low water levels.
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Distribution, Relative Abundance, and Reproductive Seasonality of Larval Fish in the Red River
<p>Spawning habitat availability and reproductive timing are crucial factors that affect survival of larval fish. To understand temporal and spatial variation in larval fishes in the Red River, samples were collected from the Red River and North Dakota tributaries using ichthyoplankton nets. …
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Effective Mitigation of Sedimentation on Riparian Riverbeds and Salmonid Populations After Dam Removal
… and rely on longitudinal connectivity to reach spawning habitat. Dams prevent longitudinal connectivity while providing cities with potable water, hydroelectricity, and irrigation. With increasing knowledge of how dams negatively affect the riparian ecosystem and various polices, dam removals …
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Reproductive Biology of Syntopic Blackside Dace and Southern Redbelly Dace in Two Kentucky Streams
… similar, but more cosmopolitan species share habitat, understanding how they interact with each other is important for conservation efforts. This is especially true if both species rely on the same spawning habitat, which could potentially lead to competitive displacement or hybridization. It …
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Spatial and Temporal Patterns of Anadromous Fish Passage at Boshers Dam Vertical Slot Fishway on the James River, Richmond, Virginia
… in 1999 and restored connectivity to 543.3 km of spawning habitat for anadromous fish. The fishway also allowed local movement of resident species. Video observation from 2001-2005 was used to evaluate environmental predictors of American shad (Alosa sapidissima) and sea lamprey (Petromyzon …
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Distribution, ecology, and reproductive biology of the orangefin madtom (Noturus gilberti)
… most individuals apparently died shortly after spawning. Spawning habitat of orangefin madtoms in Craig Creek appeared to be fast-water riffles dominated by small cobble substrate. Attempts to induce N. gilberti spawning in the laboratory were unsuccessful due to high mortality of captive fish. …
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Behavioral Response of Pacific Lamprey (Entosphenus tridentatus) to Predator Odors
… a number of challenges in reaching their desired spawning grounds during the adult migratory phase, and predators are suspected to be one of these challenges. Understanding if Pacific lamprey respond to predator odorants may provide a management tool for use in conjunction with attractants in …
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Bayesian Hierarchical Methods and the Use of Ecological Thresholds and Changepoints for Habitat Selection Models
Modeling the complex relationships between habitat characteristics and a species' habitat preferences pose many difficult problems for ecological researchers. These problems are complicated further when information is collected over a range of time or space. Additionally, the variety of factors …
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Distribution, growth, and transport of larval fishes and implications for population dynamics
… with greater population connectivity amongst habitat patches, while the evenly-distributed vertical behavior and downward ontogenetic vertical migration were similar to one another and led to greater retention near natal sites. However, hydrodynamics and habitat vailability created some local …
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Effects of global climate change on the recruitment of Anchovy in the Southern Benguela upwelling system
… and potentially become even more conducive to spawning in the future. The results show similar mean wind speeds to present day values, a decrease in mean turbulence, a decrease in the frequency of extreme wind speeds and a decrease in the frequency of extreme turbulence during the anchovy …
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THE LIFE HISTORY AND ECOLOGY OF RIVERINE SOCKEYE SALMON (ONCORHYNCHUS NERKA) IN A LARGE FLOODPLAIN RIVER
… of salmonids is linked to the complexity of habitat in large floodplain rivers. Dynamic floodplain processes are driven by flow, sediment transport, cut and fill alluviation, woody plant succession, and ecosystem engineers, notably beavers, that create dynamic and biophysically complex …
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History, Ecology and Restoration Potential of Salmonid Fishes in the Umpqua River, Oregon
… in the late 1800’s and early 1900’s. Freshwater habitat metrics were sampled to determine impacts to salmonid sustainability in the basin, and possible restoration opportunities. The metrics examined were: juvenile salmonid density, non-native fish species, water chemistry, temperature, aufwuchs, …
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THE LIFE HISTORY AND ECOLOGY OF RIVERINE SOCKEYE SALMON (ONCORHYNCHUS NERKA) IN A LARGE FLOODPLAIN RIVER
… of salmonids is linked to the complexity of habitat in large floodplain rivers. Dynamic floodplain processes are driven by flow, sediment transport, cut and fill alluviation, woody plant succession, and ecosystem engineers, notably beavers, that create dynamic and biophysically complex …
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