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 54 for “"biotic integrity"”.
-
Biotic Integrity and Northern Pike Ecology in Eastern South Dakota
… and services in streams are impaired when their biotic communities are degraded by anthropogenic stressors. An index of biotic integrity (IBI) translates community structure into a standardized stream health score. Documenting stream health is important in the Northern Glaciated Plains (NGP) …
-
A Vegetation-Based Index of Biotic Integrity for Wetlands of Kentucky
… assessment method for wetlands. Indices of biotic integrity (IBIs) are multimetric assessment methods that use characteristics of biological communities in wetlands as indicators of ecological integrity, or the degree to which a habit resembles a pristine reference condition. IBIs are …
-
Developing an index of biotic integrity (IBI) for warmwater wadeable streams in Virginia
The index of biotic integrity (IBI) comprises several fish-assemblage attributes, called metrics, that reflect how a site differs from least-disturbed (by anthropogenic influences) conditions. Understanding how metrics at least-disturbed sites vary across landscape classes (e.g., physiographies, …
-
Biotic Integrity in the Northwestern Great Plains and Mechanisms Regulating Stream Condition in South Dakota
<p>Anthropogenic disturbance of streams can alter biotic integrity in various ways. Some degradation is easy to classify and monitor, others such as habitat impairment may be less easy to quantify. The Index of Biotic Integrity (IBI) is a unique method of assessing the aquatic health of an …
-
Vegetation-Based Metrics Of Biotic Integrity For Assessing The Ecological Condition Of Wetlands Of Kentucky
… dramatic decline and to restore the ecological integrity of waters of the United States. To enforce the Clean Water Act, a number of ecological assessment techniques have been developed to quantify the ecological quality of the waters of the United States. Kentucky recently adopted a rapid …
-
The Effect of Habitat on the Index of Biotic Integrity (IBI) in Bull Creek, Southwest Missouri
… habitat variables, and measure the index of biotic integrity (IBI), using fish assemblages as response to habitat variables. Physical habitat variables included mean wetted width, mean thalweg depth, mean canopy density, kilometers to the confluence of Bull Creek with Lake Taneycomo, …
-
A Comparison of the Index of Biotic Integrity by Habitat Type in Swan Creek, Southwest Missouri
A multimetric Index of Biotic Integrity (IBI) based on fish communities was used to score Missouri streams as an assessment of stream health. During summer 2002 we sampled Swan Creek, a 5th order stream in Southwest Missouri, which flows into the White River system. We sampled 19 sites, collecting …
-
Fish Community Structure and Water Quality Assessment (Index of Biotic Integrity) of the San Marcos River, Texas
… point and nonpoint sources using the Index of Biotic Integrity (181). The stable 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 …
-
Effect of riparian land use on the biotic integrity of fish assemblages in Black Creek, Chattanooga, Tennessee
… ecological health. I assessed fish assemblages (biotic integrity), water quality, instream habitat, and riparian land-use features at eight sites in Black Creek, May-June 2000. Water quality conditions (temperature, dissolved oxygen, pH, conductivity) were favorable for stream fishes, but some …
-
A Comparison of Water Quality Analyses and the Index of Biotic Integrity in Bull Creek, Southwest Missouri
… an alternative methodology such as the Index of Biotic Integrity (IBI) in hopes to find an accurate and encompassing standard for all aquatic assessments. This study compares water quality analyses and the Index of Biotic Integrity for measuring the ecological health of Bull Creek, a stream of …
-
Using the Index of Biotic Integrity of Fish Communities to Evaluate Habitat Quality in Middle Chattahoochee River Tributaries
… analyzed using scoring criteria for an Index of Biotic Integrity developed by Georgia Department of Natural Resources for wadeable streams in the Apalachicola drainage basins of the Piedmont Ecoregion of Georgia. A total of 7715 individuals of 48 species were collected from the tributary streams …
-
The Development and Evaluation of an Index of Biotic Integrity for Small Lakes in Western and Central New York
… In order to properly protect or restore the integrity of an aquatic system we must first accurately assess its present condition. The Index of Biotic Integrity (IBI) is a relatively new approach to this problem which utilizes the characteristics of a lake's fish assemblage to assess lake …
-
Effects of land use on biotic integrity in ridge and valley streams in the Chattanooga Metropolitan Area, Tennessee-Georgia
… of fishes were collected by electrofishing. Biotic integrity at all sites was degraded to some extent, with 16 sites receiving index of biotic integrity (IBI) ratings of poor or lower. Index of Biotic Integrity scores were negatively correlated with urban land use at the watershed scale and …
-
Temporal Change in Fish Communities and Modification of the Index of Biotic Integrity for the James River of the Dakotas
… health in prairie streams using the index of biotic integrity (IBI) requires robust metrics to account for natural variability that characterizes these lotic svstems. Twentv-two metrics were tested and used to modify an IBI to assess the biological health of five regions within the basin …
-
Streams in a changing landscape : identifying candidate reference reaches to assess the physical and biotic integrity of Missouri's wadeable streams
… to predict areas of high and low biological integrity to inform management decisions and meet conservation needs. Previous efforts to quantify anthropogenic disturbances to aquatic systems have resulted in indices lacking the ability to identify specific stressor impacts, describe the ways …
-
Chironomidae Contributions to the Macroinvertebrate Assemblage, Index of Biotic Integrity and Relationships to Water Quality Impairment for Eastern South Dakota Streams
… been attempted to develop a multimetric index of biotic integrity (IBI) using Chironomidae larvae. The objectives of this research were to (1) assess the contribution of Chironomidae assemblage structure to the total macroinvertebrate assemblage, (2) develop an IBI and validate the index against …
-
Correlation Between Bioassessments of Macroinvertebrates and Fishes and Natural Land Cover in Virginia Coastal Plain Watersheds
… of Unfragmented Natural Land Cover (UNLC) and biotic integrity could be established. I hypothesized that as the area of UNLC increased in a watershed at either the whole catchment or riparian scale, biotic indices measuring stream water and habitat quality would increase. Biotic integrity was …
-
Data-driven analyses of watersheds as coupled human-nature systems
… namely streamflow frequency and instream biotic integrity. We also aim to understand how the dominant controls of these emergent properties change through time. This study targets these needs by quantitatively linking natural and anthropogenic drainage area characteristics to flow …
Page 1 of 3