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.
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Showing 1 to 20 of 26 for “"Community Metrics"”.
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Development Of An Avian Index Of Biological Integrity For Kentucky Wetlands
… sites were used to calculate a set of 49 avian community metrics. Avian metrics were tested for correlation with independent landscape, hydrology and habitat measures of wetland condition. High performing, non-repetitive metrics were tested using a model averaging approach to find the best set …
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Interactions between ecosystem engineering by burrowing sandprawns (Callichirus kraussi) and nutrients: consequences for benthic community structure and ecosystem functioning
… this process drives ecosystem functioning and community structure either individually, or interactively with other processes, is however, limited, particularly in shallow soft- littoral ecosystems. At a local level, such systems are dominated by allogenic engineers such as the burrowing axiid …
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Effects of physical and chemical disturbance on stream ecosystem structure and function
… 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 response of structural and functional indicators to ecosystem-level disturbances. I …
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Evaluating the Potential Impacts of Municipal Wastewater Effluent on Benthic Macroinvertebrates in the Upper Bow River
… Bow River source water. In both projects, community metrics that identify types of taxa found in assemblages also described changes to communities more effectively than traditional metrics of urban disturbance such as diversity and richness.
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An ecological evaluation of an urban stream restoration in West Chicago, Illinois
… habitat, water quality, macroinvertebrate community, and fish community of a 13 km stream restoration on the West Branch of the DuPage in the suburban Chicagoland area, using the similar, unrestored East Branch of the DuPage as a reference. The restored West Branch had higher quality …
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Describing and Characterizing Potential Lemon Shark (Negaprion brevirostris) Nursery Habitat in Mississippi Coastal Waters
… islands. This study used different spatial and community metrics to evaluate association of Lemon Sharks with different habitats and regions across the study area. Kernel utilization distribution demonstrated a reduced use area during colder temperatures with movements restricted to the southern …
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Temporal Dynamics of Benthic Macroinvertebrate Communities and Their Response to Elevated Specific Conductance in Headwater Streams of the Appalachian Coalfields
… High 756-1,535 S/cm). Benthic macroinvertebrate community structure was quantified by the Virginia Stream Condition Index and other metrics. Structural metric differences among SC Levels and month of sampling were explored. Reference-SC streams exhibited significantly higher scores on most …
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Impacts of aquaculture effluent on water quality and biotic communities in Virginia headwater streams
… Index of Biotic Integrity (IBI), based on fish community metrics, did not correspond to the RBP, and reflected poor water quality at C and D. Low fish species richness and abundance in these headwater streams limited the usefulness of the IBI. The proposed general discharge permit for …
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Physical and Biological Impacts of Gravel Mining on Three Southwest Missouri Streams
… in habitat, flow, and the biological community. For my research I focused on determining possible physical and biological impacts of gravel mining on Bull Creek, Swan Creek, and the Finley River in southwest Missouri. I hypothesized that overall abundances of native game fishes have …
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Benthic metrics as indicators of human disturbance in a marine-dominated lagoon
… disturbance-induced ecosystem change. Benthic metrics are an excellent example of disturbance indicators in soft sediment based aquatic systems, and are directly applicable to one of South Africa’s most economically and ecologically significant marine-dominated lagoons; Langebaan lagoon. This …
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Assessing the Role of Declining Calcium in Biological Recovery on Zooplankton in Historically Acidified Lakes
… to be similar to those of acidification. Total community metrics (i.e. abundance, richness, evenness, size-structure) remained similar across treatments; however, low calcium and low pH each resulted in lower abundance of Daphnia pulex/pulicaria – a large acid-sensitive, and heavily calcified …
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Small scale hydrogeomorphic features influence macroinvertebrate food webs in two Great Plains rivers
… in the food web, consumer resource use, trophic community metrics and size corrected standard ellipse area (SEAc) a measure of consumer niche breadth. I found river sinuosity and percent fine grain sediment to have a large influence on the food web. Increasing sinuosity was associated with a …
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Benthic Macroinvertebrate Community Responses to a Headwater Valley Restoration at Slabcamp Creek, Rowan Co., Kentucky
… begin baseline studies of the macroinvertebrate community in the restored section of Slabcamp Creek and to compare those findings to White Pine Branch (a pre-restoration control site) during the first post-restoration year. Specific objectives of my study were to: 1) report seasonal estimates of …
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Relationships Between Streamside Management Zone Width and Biotic Communities of Headwater Streams in West Virginia
… Mean values for a number of macroinvertebrate community metrics were indicative of poorer water quality in streams harvested with a 4.5 m SMZ. During this short-term study SMZs of at least 15.3 m appeared to be sufficient to maintain water quality. However, harvesting was restricted to one side …
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Examining Avian Communities in Wetlands at Multiple Spatial Extents
… a meta-analysis that compared wetland bird community metrics between anthropogenic wetlands and reference sites. My results suggested that while created and restored wetlands do support many avian species, these communities are typically dissimilar from those at natural wetlands. Finally, I …
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Identification and incorporation of quantitative indicators of ecosystem function into single-species fishery stock assessment models and the associated biological reference points
… of this study were to describe the demersal fish community (DFC) associated with the northwestern Gulf shrimp trawl fishery, and to utilize a multispecies Lotka-Volterra model to examine possible community level effects of fishing. Community level effects include predator-prey interactions and the …
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Predation On The Eastern Oyster Crassostrea Virginica On Intertidal Reefs Affected By Recreational Boating
… oyster spat. Contrary to expections, analyses of community metrics showed that dead margins did not significantly affect the biodiversity of back-reef areas on oyster reefs. Modified lift nets (0.25 m2) were placed on six different oyster reefs (3 reference reefs and 3 containing dead margins) to …
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Spatial habitat variation in a Great Plains river: effects on the fish assemblage and food web structure
… assemblage structure in summer 2007 using fish community metrics and at 3 sites in 2006 for food web structure using stable isotope analysis. Satellite imagery indicated riparian habitat on the Kansas River was dominated by agriculture in the upper reaches (>35%) and tended to increase in urban …
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Disturbance Related Patterns in Fish Community Structure and Function in River Systems of the Lower Athabasca Oil Sands Region, Alberta
… and Oil Sands (OS) mining operations on fish community composition patterns in three rivers located in the Athabasca Oil Sands Region (AOSR). Using historical data sets, this thesis attempted to evaluate disturbance-related patterns in fish community composition. Fish community-environmental …
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Terrestrial-aquatic transfers by hippopotamus (Hippopotamus amphibius): effects on food web and benthic community structure of the St Lucia Estuary, iSimangaliso Wetland Park, World Heritage Site, South Africa
… influence of hippo dung on food web and benthic community structure in the St Lucia Estuary - a subtropical estuarine lake on the east coast of South Africa. It was hypothesized that experimental dung enrichment at high levels would result in significant declines in benthic community metrics and …
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