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Showing 1 to 20 of 41 for “"headwater stream"”.
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Headwater stream network connectivity: biogeochemical consequences and carbon fate
Headwaters may be small relative to other aquatic ecosystems, but they are neither simple nor static environments. Heterogeneous stream corridors constitute the majority of river network length and regulate cycling of carbon and oxygen as they expand and contract their connections across the …
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Modeling Intermittent and Perennial Headwater Stream Origins In North Carolina.
<p>Low-order headwater streams, a link between the upland landscape and larger streams within a watershed, affect watershed hydrology. Yet current widely available maps inadequately depict headwater streams, underestimating channel length or omitting channels entirely. Intermittent and perennial …
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Headwater Stream Biofilm Structure and Function at High Resolution Spatial-temporal Scales.
… investigated over a 25 month period within three headwater sub-catchments of the River Eden catchment, NW England. This was undertaken as structural and functional attributes of headwater stream have at large been neglected, despite the long-standing recognition of the importance of …
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Evaluating the Long-Term Morphological Response of a Headwater Stream to Three Restoration Techniques
The stream restoration industry has been growing since the addition and modification of Section 404 to the Clean Water Act. Many projects follow the guidelines of Natural Channel Design and use in-stream structures to stabilize stream channels. Post-project monitoring rarely exceeds 3-5 years, and …
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Seasonal habitat and movement ecology of adult brook trout in a northern Michigan headwater stream
… This study examined the seasonality of stream-resident adult brook trout habitat use and movement patterns, and the influence of brook trout size and condition on mobility at multiple spatiotemporal scales. Brook trout in a small northern Michigan stream were collected via electrofishing …
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The influence of elevated arsenic concnetrations on stream biota and leaf breakdown in a headwater stream
… where it may be found at high concentrations. A headwater stream adjacent to an 85 year-old abandoned arsenic mine was investigated to determine the influence of arsenic on stream biota and processes using an upstream (reference) and downstream (mine-influenced) comparative approach. Arsenic …
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Assessment Of The Macroinvertebrate Assemblages From The Mesohabitats Of A Headwater Stream-Wetland Hydrologic Restoration In Eastern Kentucky
<p>The bulk of streams in the U.S. have been negatively impacted by anthropogenic disturbances and the streams of Kentucky are no exception. In recent decades stream restoration has become a common practice in order to improve habitat degradation resulting from land use practices such as …
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Development of a Hydrologic Model for an Urban Headwater Stream: The Influence of Pervious Surface Properties on Runoff Dynamics
… The MC catchment is a small, dynamic urban stream system with a range of land use/land cover (LULC), an extensive and well-developed stormwater drainage network, and extensive urbanization (over 90% developed, and almost 50% impervious surface area (ISA)). Selected datasets provided …
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Effects of repetitive electroshocking on fish populations in experimental raceways and a small headwater stream in southern West Virginia
… when adjusted for the period before intermittent streamflow. This work has demonstrated that repetitive exposure to electroshocking induces mortality in a predictable manner on fish populations. Depletion estimates are usually accomplished with a much-reduced expenditure of time and effort over …
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Seasonal Variation in Rates of Nitrification Associated with Patterns of Carbon and Nitrogen Supply in a Southern Appalachian Headwater Stream
… is an important nitrogen (N) transformation in stream ecosystems. Experimental addition of dissolved organic carbon (DOC) has been shown to inhibit rates of nitrification, and rates have been stimulated by NH4-N addition. Insights regarding the role of particulate organic matter (POM) in this …
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The Role of Leaf Litter and Small Wood in the Retention of Fine Particles During Storms in an Appalachian Headwater Stream
Streams are constantly subject to downstream movement of materials. The role of fallen leaves in resisting downstream transport of particulates is largely unquantified. The litter exclusion study at Coweeta presented the opportunity to study a stream without litter input. I expected removal of leaf …
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Recovery of community structure and leaf processing in a headwater stream following use of a wetland passive treatment system to abate copper pollution
… Prior to treatment, copper concentrations in the stream ranged from 8.9 to 32.0 μg/L at the impacted sites and from 0.1 to 7.7 μg/L at the reference site. In kick samples, insect abundance (n) and the number of taxa (#) were reduced at the impacted sites (n = 31, 22, 33, 24 and # = 190, 246, 266, …
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Predicting the Downstream Impacts of Headwater Burial in Kemptville Creek Watershed (Ontario) Using the SWAT Model
Headwater streams can compose up to 80% of the total stream length within a watershed but remain most susceptible to stream burial during land use change or management. Rerouting streams into tile drains, canals, non-perforated pipes and paving over, are all examples of stream burial. This study …
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Nutrient dynamics in a headwater stream : use of continuous water quality sensors to examine seasonal, event, and diurnal processes in the East Fork Jemez River, NM
Stream water quality can change substantively over seasonal, event, and diurnal scales. Multiple biogeochemical processes operate on a 24-hour timescale, and also may be influenced by local weather and precipitation events. Increased sampling frequency, made possible by recent developments in …
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Effects of Perturbations by Agricultural Land Use on Structure and Function of Stream Ecosystems
The effects of agricultural land use on headwater stream ecosystems were assessed. Three factors were examined: (1) the role of physical and biological processes in terrestrial, riparian, and aquatic portions of agricultural watersheds as regulators of water quality, (2) the changes in fish c
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Spatial and Temporal Variability of In-Stream Functioning within a Forested, Headwater Piedmont Watershed
… Chesapeake Bay, lotic processes throughout its headwaters may buffer increased nitrogen inputs by converting them to stable forms, ultimately through denitrification to N2 gas. However, the temporal environmental factors controlling baseflow nitrogen retention are poorly understood, particularly …
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Influences of forests on invertebrate communities in Icelandic streams
Effects of forests on headwater stream invertebrate communities were studied in eastern and southern Iceland, which are two geologically different regions. The eastern research area is composed of solid basaltic rock with direct run-off streams. The streams drain treeless, birch and conifer …
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Short-term effects of defoliation by gypsy moth larvae on Appalachian headwater streams in Virginia
… by gypsy moth larvae on three aspects of headwater stream ecology, water quality, benthic macroinvertebrate community structure, and benthic macroinvertebrate function (expressed as secondary production). The experimental design was to compare measurements in three streams that were …
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A Post-Restoration Assessment of the Fishes and Macroinvertebrates of Mill Branch, Knox County, Kentucky, with Emphasis on the Blackside Dace (Chrosomus cumberlandensis)
<p>The first stream habitat restoration project for the federally threatened blackside dace, Chrosomus cumberlandensis (Starnes and Starnes), was initiated in fall 2005 on Mill Branch, a small headwater stream located in the Upper Cumberland River basin, Knox County, Kentucky. The lower 700 meters …
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