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 13 of 13 for “"Stream metabolism"”.
-
Seasonal Variation in Whole Stream Metabolism across Varying Land Use Types
Historically, whole stream open channel metabolism has been measured over short periods in conjunction with nutrient injections to assess nutrient dynamics within streams. The purpose of my study was to understand the seasonal changes in metabolism within and among streams as well as the impacts of …
-
Modelling Stream Metabolism and Fish Biomass in Headwater Streams of the Eastern Cascades Mountains
Headwater streams are important for the biological integrity of river systems because they represent most of the length of the hydrological network and control the downstream flow of energy and nutrients to larger river systems. Headwater streams are culturally and economically important because …
-
Evaluating the role of flow and specific conductivity on stream metabolism across a mining-induced salinity gradient in the Appalachian Coalfield
… salinization is a notable concern for headwater streams in Appalachia with the history of resource extraction in the region. Mountaintop removal/valley fill mining techniques in Appalachia result in the burial of headwater streams and mobilization of ions, specifically SO42-, Ca, and Mg into …
-
Impacts of legacy mining on stream structural and functional processes in an urban stream
… how neutral mine drainage (NMD) influences urban streams. Past research on both urban streams and mine impacted streams has largely focused on characterizing streams using structural approaches although there has been an increase in literature on functional processes over the past decade. As urban …
-
In-Stream Reactivity of Dissolved Organic Matter and Nutrients in Proglacial Watersheds
… Alaska were examined to better understand in-stream processing of dissolved organic matter (DOM) and nutrients during downstream transport. Specifically, this study paired glacial streams with nearby non-glacial streams and compared differences in landscape controls to: 1) evaluate the impact …
-
The Flow Regime of Function: Influence of flow changes on biogeochemical processes in streams
Streams are ecosystems organized by disturbance. One of the most frequent disturbances within a stream is elevated flow. Elevated flow can both stimulate ecosystem processes and impede them. Consequently, flow plays a critical role in shifting the dominant stream function between biological …
-
Effects of physical and chemical disturbance on stream ecosystem structure and function
… influence the structure and function of stream ecosystems. While past investigations have focused on the response of community indicators to stream disturbances, functional indicators may also be helpful for assessing stream ecosystem health. To date, few studies have compared the …
-
Stress-induced alterations in ecosystem function: the role of acidification in lotic metabolism and biogeochemistry
… how anthropogenic acidification influences stream metabolism and nitrogen (N) cycling by considering the stress response of microbial compartments responsible for these ecosystem processes. Microcosm incubations of leaf biofilms from streams of differing pH revealed greater rates of fungal …
-
Determining the Effects of Water Quality on Stream Metabolic Function of Urban Stream Corridors in Columbus, Georgia
<p>Urbanization alters streams, disrupting their natural habitat and inducing changes in nutrient dynamics and primary productivity. These human-induced interventions diminish ecological structure, homogenizing once-diverse ecosystems and posing a risk of impairment or destruction. Continuous …
-
Moving beyond the stream reach: Assessing how confluences alter ecosystem function and water quality in freshwater networks
… of carbon and nutrients are shaped both by in-stream processes and the surrounding landscape. Streams receive and transport materials from upstream and terrestrial sources that support in-stream ecosystem processes and regulate downstream water quality. Understanding how these processes within …
-
Spatial and Temporal Variability of In-Stream Functioning within a Forested, Headwater Piedmont Watershed
… this setting, three temporal "hot-moments" of in-stream nutrient processing were observed: the release of ammonium and phosphate during the warm - but shaded - growing season; nitrate uptake during autumnal leaf-fall; and a unique spike of nitrate uptake and respiration-induced degradation of …
-
Understanding Effects of Anthropogenic Activities on Element Cycling in Temperate Forest Watersheds
… results from repeated synoptic surveys of streamwater chemistry for ~30 watersheds spanning one of the largest nitrogen (N) deposition gradients in North America, located within the Great Smoky Mountains National Park. We primarily focus on patterns in dissolved organic matter (DOM) …
-
Ecosystem metabolism in coastal plain streams of southeast Louisiana : environmental and watershed effects
… for estimating the components of ecosystem metabolism in the lotic setting have been important in determining the current ecosystem theory of streams, both spatially among multiple systems and longitudinally within the same system, as well as identifying potentially impaired systems, …