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.
Results
Showing 1 to 20 of 28 for “"hydroperiod"”.
-
The effect of hydroperiod on seed banks in semi-permanent prairie wetlands
… prairie wetlands (P1 and P4) with different hydroperiods. The main objective was to determine if hydroperiod affected seed pool characteristics. Additionally, 48 samples were collected in 1986 from wetland P1 to determine if seed bank composition changed annually without a change in mature …
-
The Role of Nitrogen Availability, Hydroperiod and Litter Quality in Root Decomposition Along a Barrier Island Chronosequence
… Term Ecological Research site), addressed how hydroperiod, litter quality and nitrogen availability influenced below ground root decay in response to gradients associated with site age and topographic position and in the context of a nitrogen limited ecosystem. Effects on rates of mass loss and …
-
The influences of hydrology and vegetation on emergent insect and benthic macroinvertebrate communities across space and time in seasonally inundated, geographically isolated wetlands
… through their richness and biomass, with long hydroperiod sites and marshes having the greatest richness and biomass of both benthic macroinvertebrates and emergent aquatic insects. We found that both hydroperiod length and vegetation type were important predictors of some but not all of our …
-
Possible Effects Of Climate Change On Induced Defenses In Tadpoles
… will be affected, resulting in shorter average hydroperiods (the amount of time a pond holds water). Species that live in these ponds will face increased stress due to these environmental changes, which may affect the timing of yearly events and alter community composition. For example, …
-
Monitoring Hydrology in Created Wetland Systems with Clayey Soils
This research project evaluated the overall hydroperiod and effects of monitoring well design parameters on observed levels of saturation in created wetlands with high-clay subsoils at the Cedar Run 3 mitigation bank site in Prince William County, Virginia. Three complete replications of an …
-
Evaluation of a Water Budget Model for Created Wetland Design and Comparative Natural Wetland Hydroperiods
… that predicts the annual water level regime (hydroperiod). However, many studies of created wetlands indicate that post-construction hydroperiods frequently are not similar to impacted wetland systems. My primary objective was to evaluate a water budget model, Wetbud (Basic model), through …
-
Amphibian Community Similarity Between Natural Ponds And Constructed Ponds Of Multiple Types In Daniel Boone National Forest, Kentucky
… of habitat variables including canopy cover, hydroperiod, upland coarse woody debris, aquatic vegetation, maximum depth, Ohio Wetland Rapid Assessment Score (ORAM), and pond type were recorded to examine relationships between amphibian species and habitat variables. Community comparisons were …
-
Factors Affecting Distribution and Abundance of Aquatic Macroinvertebrates in Autumnal Wetlands in Mammoth Cave National Park, Kentucky, USA
… and EV's. Additionally, the theory that hydroperiod would effect richness did not apply to these ponds. Within-pond canonical correspondence analyses, however, yielded strong relationships. Further testing using regression analysis and Mann-Whitney U-tests demonstrated that …
-
Testing The Peninsula Effect: Does It Affect Freshwater Crustaceans Inhabiting Ephemeral Wetlands On Florida's Ridges?
… to nearest water body, fish presence or absence, hydroperiod, total transmitted light and canopy openness. Crustacean species were identified to the lowest practical taxonomic level (typically species) and recorded as present or absent. A total of 53 different crustaceans were identified, …
-
Interactions between Eastern Newts and Wood Frogs in an anthropogenically altered wetland system in eastern Kentucky
… species with larval periods that require a long hydroperiod (e.g., Eastern Newts [<em>Notophthalmus viridescens<em>], American Bullfrogs [<em>L. catesbeianus<em>], and Green Frogs [<em>L. clamitans<em>]). The new members of the amphibian community assemblage are top predators known to consume …
-
Surface water flow resistance due to emergent wetland vegetation
… a successful wetland design is duplicating the hydroperiod of the desired wetland type. Dense wetland vegetation affects surface water flow rates by increasing flow resistance. Prior research represented the vegetation as individual stems; however, many wetland species grow in clumps. Therefore, …
-
Amphibian Community Composition And Disease Susceptibility In Ridge-Top Wetlands Of The Daniel Boone National Forest
… their placement, and also the size and hydroperiod differences observed between natural wetlands in the two areas. For the DBNF, modifying constructed wetlands to replicate natural features such as hydroperiod, littoral zone depth, and vegetation would likely increase the recruitment and …
-
Amphibian and plant communities of natural and constructed upland-embedded wetlands in the Daniel Boone National Forest
… of these constructed wetlands have permanent hydroperiods and different amphibian communities than co-occurring natural ephemeral wetlands. Wood frog and marbled salamander larvae are found almost exclusively in natural wetlands and green frog larvae and eastern newts are found in constructed …
-
Evaluating a Process-Based Mitigation Wetland Water Budget Model
… Modflow-based approach resulted in more accurate hydroperiod predictions on a yearly basis than the Pierce Method. However, the Integrated Pierce method model, utilizing the FAO-56 Penman-Monteith method of estimating potential evapotranspiration instead of Thornthwaite's method most accurately …
-
Extended Adolescence: The Ecology and Endocrinology of Facultative Paedomorphosis
… roles of population density, predator presence, hydroperiod, and stress hormones in regulating the expression of paedomorphosis. Results indicated the regulation of paedomorphosis through multiple ecological factors may be reducible to density-mediated effects, with a few notable exceptions. I …
-
The effects of warming on carbon and microbial community wetland dynamics at Turnbull National Wildlife Refuge, Washington
… carbon. In the face of global warming, wetland hydroperiods could shift causing changes in their functionality. My field experiment surveyed 3 plots within 12 wetlands of each hydroperiod class (i.e. 12 permanent, 12 semi-permanent, 12 ephemeral). This survey was paired with a warming experiment …
-
The Influence of Fluvial Geomorphic Processes on Spatial Patterns of Forest Primary Succession
… in association with elevation, a correlate to hydroperiod. I conducted a three-year field experiment to test the relative effects of physical flood damage, inundation, and soil moisture on locations of seedling emergence and survival, with measured environmental variables as covariates. …
-
Decomposition Dynamics in Restored and Naturally Recovering Atlantic White Cedar (<i>Chamaecyparis thyoides</i>) Wetlands
… sites despite significant differences in site hydroperiod. Root decay was not correlated with site hydrology. With regards to native root material, these results suggest that within restored sites the current status of below ground carbon storage functions appear to be deficient in comparison …
-
Population dynamics of the Columbia spotted frog (Rana luteiventris): inference from long-term demography
… I examined whether heterogeneity in pond hydroperiod on the landscape had the potential to stabilize recruitment and population dynamics. Overall, ponds with different hydroperiods showed contrasting dynamics among years. Variability in recruitment was lowest in the scenario with the …
-
Population dynamics of the Columbia spotted frog (Rana luteiventris): inference from long-term demography
… I examined whether heterogeneity in pond hydroperiod on the landscape had the potential to stabilize recruitment and population dynamics. Overall, ponds with different hydroperiods showed contrasting dynamics among years. Variability in recruitment was lowest in the scenario with the …
Page 1 of 2