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Showing 1 to 20 of 136 for “"headwaters"”.
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Upper Salinas Headwaters Conservation Plan
<p>The Upper Salinas Headwaters Conservation Plan is an effort to understand the cultural and ecosystem resources in the region, develop tools for conservation planning, and suggest a strategy and plan of action for implementation of those strategies. The plan covers a 218 square mile area between …
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Characterizing and modeling wet stream length dynamics in Appalachian headwaters
… most existing field studies of stream length in headwaters are limited to a single study area or geographic setting. Field mappings showed that wet stream length varies widely within the Appalachians; network dynamics correlated with regional geology as well as local site lithology, geologic …
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Habitat Associations Of Stream-Dwelling Salamanders At Multiple Spatial Scales In Central Kentucky Headwaters.
<p>Headwater stream systems are productive habitats that are often at risk of human perturbation, and it is crucial that ecologists understand natural patterns and processes within these ecosystems. Using a multi-scale approach, I investigated factors influencing habitat associations of …
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Concentrations of Selected Metals in Benthic Algae From the Headwaters Region of Crane Creek, Stone County, Missouri
Samples of benthic algae from two tributaries at the headquarters of Crane Creek in northwest Stone County, Missouri were collected and tested for the presence and concentration of chromium, copper, lead, nickel, and zinc by flame atomic absorption spectrophotometry. Mean metal levels in algae from …
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Delay of Spring Snowmelt due to Storm-Induced Changes in Snowpack, Columbia River Headwaters, Western Montana, USA
… data for 33 stations in the Columbia River headwaters. The addition of pore space has a greater impact of delaying snowmelt than does the addition of cold content, with snow accumulation responsible for 86% of the collective energy deficit imposed on the snowpack during storm episodes. …
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Delay of Spring Snowmelt due to Storm-Induced Changes in Snowpack, Columbia River Headwaters, Western Montana, USA
… data for 33 stations in the Columbia River headwaters. The addition of pore space has a greater impact of delaying snowmelt than does the addition of cold content, with snow accumulation responsible for 86% of the collective energy deficit imposed on the snowpack during storm episodes. …
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Integrating Taxonomic Meta-Analysis and Mussel Physiology to Assess Secondary Salinization in Appalachian Headwaters and Urban Streams
Secondary salinization from fertilizer application, mining, urbanization, and de-icing salts like sodium chloride (NaCl), is elevating chloride (Cl⁻) and sodium (Na⁺) in streams. While Cl⁻ effects on streams are well-studied, Na⁺ effects are less known. Elevated Cl⁻ levels in the environment can …
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Projecting agroforestry adoption and agroforestry water quality trading in the headwaters of the Chesapeake Bay, Virginia, USA
Agricultural nonpoint source nutrient pollution is the leading cause of water quality impairment in the Chesapeake Bay. Agroforestry, the integration of trees with crops or livestock production, or both, achieves production and conservation objectives on a single plot of land. Agroforestry is …
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Nine Peaceful Defenders of Headwaters at Redwood Summer: True for Me. Get It Done. Was it Worthy? What Got in the Way?
This study is an inquiry into the lived experience and personal meanings derived from long term commitments to justice towards better visibility and understanding of the community of nonviolence for activists, general public, and theorists of social change. Nine peaceful activists (five men and …
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Salt in the Wound: Trophic Mismatches Emerge Between Macroinvertebrate Secondary Production and Basal Food Resources Along a Salinity Gradient in Central Appalachian Headwaters
Mountaintop removal mining practices in central Appalachia have directly altered headwater stream biotic communities through elevated ions (e.g. Cl-, Ca2+, SO42-) that increase salinity, as measured by specific conductance (SC). It has been long understood that benthic macroinvertebrate …
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Impact of localized harvest on the population of smallmouth bass (Micropterus dolomieu) of Lake Moomaw, Virginia
… of smallmouth bass that congregate in the headwaters of the reservoir during the spring spawning period, where they are vulnerable to a shore-based, harvest-oriented fishery. The extent of this fishery and resulting effects on the small mouth bass population were analyzed by means of a …
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Model based assessment of potential impacts of climate change on the flow of the main headwaters of the Nile River: Equatorial Lakes Region and Blue Nile Basins
… of climate change on the flow of the main headwaters of the Nile River: Equatorial Lakes Region and Blue Nile basins (Under the direction of Dr. Richard Anyah).</p> <p>Spatially and temporally detailed assessment of the hydrologic processes of the main sources of the Nile River headwaters …
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Fish Community Structure and Water Quality Assessment (Index of Biotic Integrity) of the San Marcos River, Texas
… water temperature, flow and clarity found in the headwaters of the San Marcos River has allowed the development of a refugia for endemic and introduced aquatic plants and animals. Over the entire length of the river, fifty-three species of fishes were collected. Due to the unique characteristics …
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Nothing is Perfect, But Something is Just Right: Redevelopment of Inner-Ring Suburbs - Integrating Ecological Systems into Modern Urban Villages
… along the historic stream channel path at the headwaters of Spout Run in northern Arlington County Virginia. Stormwater mains downstream from the headwaters have already been deemed below capacity for the unprecedentedly intense storms that have become an annual occurrence. Here, the major …
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Land use influences on benthic invertebrate assemblages in southern Appalachian agricultural streams
… sampled six agricultural streams (3 with cleared headwaters and 3 with forested headwaters) at three points along a gradient (headwaters, a midpoint, and a downstream site). At each site, I measured a variety of physico-chemical parameters, including temperature, chlorophyll a, discharge, …
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The use of contemporary and historic diatom assemblages in the derivation of reference state communities for rivers in KwaZulu-Natal, South Africa
Reference state conditions of minimally disturbed headwaters were identified from present-day and historic diatom data of key rivers within the selected study area, with the main purpose of establishing diatom reference state communities.
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Spatiotemporal Variation in Dispersal as a Driver of Macroinvertebrate Metacommunity Dynamics
… and drift at eight sites across a gradient from headwaters to mainstem to discover if there was any difference in community dynamics between poorly connected sites (headwaters) and well connected sites (mainstems) across seasons. Broadly, we hypothesized that mainstem sites would have less …
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Benthic macroinvertebrate community structure responses to multiple stressors in mining-influenced streams of central Appalachia USA
Headwaters are crucial linkages between upland ecosystems and navigable waterways, serving as important sources of water, sediment, energy, nutrients and invertebrate prey for downstream ecosystems. Surface coal mining in central Appalachia impacts headwaters by burying streams and introducing …
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Sistemática, filogenia e biogeografia do grupo Characidium lauroi Travassos, 1949 (Characiformes, Crenuchidae)
… the history of isolating events among of the headwaters of southeastern Brazil was important for the species diversification process. Characidium japuhybense, which occurs only in coastal rivers, is the most basal species. Characidium lauroi and Characidium sp. "piabanha" form a monophyletic …
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Sedimentology and Stratigraphy of the Coalmont Formation, Northwestern, North Park, Colorado, U.S.A.
… in the North Park portion of the Colorado Headwaters basin of north-central Colorado, preserves synorogenic strata from the Laramide orogeny. The Coalmont Formation consists of a variety of fluvial and lacustrine sedimentary facies that have not been documented in depth. Using geologic …
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