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 17 of 17 for “"biotic index"”.
-
Integrating GIS with Benthic Metrics: Calibrating a Biotic Index to Effectively Discriminate Stream Impacts in Urban Areas of the Blackland Prairie Eco-Region
Rapid Bioassessment Protocols integrate a suite of community, population, and functional metrics, determined from the collection of benthic macroinvertebrates or fish, into a single assessment. This study was conducted in Dallas County Texas, an area located in the blackland prairie eco-region that …
-
Assessment of water pollution arising from copper mining in Zambia: a case study of Munkulungwe stream in Ndola, Copperbelt province
… to estimate the quality of water using the biotic index score. Finally, the relationship between physiochemical parameters and biotic index score was analysed to interrogate their inter-relationship with respect to water quality. The results showed that the average values of dissolved oxygen …
-
Effects of Stream Crossings on Macroinvertebrate Assemblages of the Upper Current River, Ozark National Scenic Riverways, Missouri
… four metrics (taxa richness, Shannon's index, EPT, biotic index) combined into the Stream Condition Index and assessed effects of stream crossings with a two-way nested ANOVA for each season. All metrics showed strong differences among sites but inconsistent effects among locations. …
-
Factors Affecting Water Quality and Microinvertebrate Distribution Within a Small Black Hills Stream
… Among the community indices utilized, the biotic index provided the greatest discrimination among stations and tended to group stations above and below the development site</p>
-
Geospatial Modeling of Forest Road Networks and Their Effect on Stream Macroinvertebrate Communities
… (i.e. % Intolerant Taxa, Hilsenhoff Biotic Index, etc.) were analyzed to test the significance of the spatial distribution of Road Impact Factors. These 10 metrics were analyzed under the hypothesis that values will be lower for those study areas that have a higher degree of road …
-
Assessing Macroinvertebrate Community Recovery in Post Restoration Silver Bow Creek, Montana
… This analysis evaluates changes in benthic biotic community composition throughout the period of record (1986 to 2009). Transformations of historical data were necessary to standardize community information and calculate indices of biotic integrity. A multivariate method, Classification …
-
Assessing Macroinvertebrate Community Recovery in Post Restoration Silver Bow Creek, Montana
… This analysis evaluates changes in benthic biotic community composition throughout the period of record (1986 to 2009). Transformations of historical data were necessary to standardize community information and calculate indices of biotic integrity. A multivariate method, Classification …
-
How do fine sediments and Hangman Creek discharge affect benthic macroinvertebrates in the Spokane River?
… Shannon-Weaver diversity; Hilsenhoff Family Biotic Index (HFBI); and Biological Sediment Tolerance Index (BSTI) were not affected. In late summer 2018, substrate significantly affected only the density of macroinvertebrates. Overall, the results suggest that areas with fine sediment were …
-
Reference conditions for streams in the Grand Prairie Natural Division of Illinois
… insect orders (EPT), a modified Hilsenhoff Biotic Index (HBI), and a 12 parameter Habitat Quality Index (HQI). Reference quality streams were compared to 21 randomly selected meandering and 30 randomly selected channelized streams which were assessed by the Critical Trends Assessment Program …
-
Biological assessment of tropical riverine systems using aquatic macroinvertebrates in Tanzania, East Africa
… in river systems'; 'rivers with similar abiotic features have similar macroinvertebrate assemblages'; and 'spatio-temporal variation in macroinvertebrate assemblages influence bioassessment', are tested. Macroinvertebrate and environmental data were collected from the Pangani, Rufiji and …
-
Predicting the Downstream Impacts of Headwater Burial in Kemptville Creek Watershed (Ontario) Using the SWAT Model
… Authority were assessed using the Family Biotic Index (FBI) OBBN metric and Shannon-Weiner Diversity Index. Predicted discharge, chlorophyll a, dissolved oxygen (DO) and sediment inputs were compared against the OBBN community structure, at 7 sample sites. Headwater stream burial results …
-
Post-implementation re-assessment of agricultural best management practices on watersheds of Conesus Lake: Effects on stream water chemistry and aquatic macroinvertebrate communities
… performed an aquatic invertebrate diversity and biotic index study to determine if BMP streams have healthier populations of aquatic macroinvertebrates than non-BMP streams. We observed higher nutrient concentrations and loss of nutrients in the agricultural streams rather than the reference …
-
Establishing the Citizen Science Stream Index (CSSI) to monitor water quality in freshwaters
… water quality and data capture. In this thesis a biotic index called the Citizen Science Stream Index (CSSI) was established using a principal component analysis of an EPA data set of macroinvertebrates. A further analysis was made using the provided Q-Values in this data set to find the most …
-
Chironomidae Contributions to the Macroinvertebrate Assemblage, Index of Biotic Integrity and Relationships to Water Quality Impairment for Eastern South Dakota Streams
… has 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 …
-
Ecological studies of benthic macroinvertebrates for determining sedimentation impacts in Chattahoochee National Forest streams
… percent deposited sediment levels. The final index developed from cumulative abundances showed a relationship with deposited sediment within the range 0 – 30%, and that low range was due to the low deposited sediment levels at which all 50% cumulative abundances fell (1 - 10%). The …
-
Multimetric assessment of freshwater macroinvertebrate communities in Flanders, Belgium
… Ratio (EQR) showing relative proportion of the index compared to the reference conditions. This EQR ranges from zero to one, respectively corresponding to a bad and a very good ecological status. This interval is divided into five classes reflecting bad, poor, moderate, good and high ecological …
-
Detecting anthropogenic impacts on estuarine benthic communities
… (sea surface temperature, Southern Oscillation Index, and wind-wave exposure) were important predictors of compositional turnover, reflecting a matrix of processes interacting across space and time. Generalized linear models were used to link these turnover values to measures of benthic …