Global ETD Search
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Showing 1 to 17 of 17 for “"community assemblage"”.
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Effects of Impoundments on the Community Assemblage and Gene Flow of Stream Crayfishes
… which subsequently changes biological assemblages and creates barriers to gene flow. While changes in species assemblages and gene flow have been assessed for numerous impoundments and stream organisms, no study has assessed the effects of large impoundments on crayfish assemblages and …
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Effects of Trout Introduction on Community Assemblage and Behavior of Native Fish in the Missouri Ozarks
… potential impacts of trout introduction on community assemblage and behavior of native fish. An index of biotic integrity (IBI) was used to compare assemblages between sites of trout introduction and contemporaneous controls. Habitat and water temperature data were collected throughout 2012 …
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Interactions between Eastern Newts and Wood Frogs in an anthropogenically altered wetland system in eastern Kentucky
… of the ridge-top ecosystem support an amphibian community assemblage characterized by species with short larval periods (e.g., Wood Frogs [<em>Lithobates sylvaticus<em>] and Marbled Salamanders [<em>Ambystoma opacum<em>]). Over the last 25 years, hundreds of wetlands have been constructed within …
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Environmental DNA (eDNA) Metabarcoding: Analysis of Freshwater Macroinvertebrate Community Structure and Diversity
… USA). I performed eDNA sampling to determine community richness and variability within and among each watershed, and I targeted cytochrome c oxidase I (COI) for amplicon sequencing. I analyzed the resulting alpha and beta biodiversity indexes to assess the ecological distribution of freshwater …
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Impacts of Land-Use on Leaf Breakdown and Macroinvertebrate Assemblages in Southern Appalachian Streams
… extent. Impacts of land-use on macroinvertebrate assemblages are examined in Chapter 2. Shannon diversity, %EPT, and NCBI were significantly related to land-use regime. There were significant negative relationships between macroinvertebrate diversity and conductivity and temperature. In addition, …
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Evaluating Marsh Restoration Success Using Structural and Trophic Metrics on Deer Island, MS
… the intention of supporting natural consumer assemblages. To test this, quadrat and minnow trap sampling were used to compare invertebrate and nekton abundance, species richness, and diversity of two restored marshes (5+ yrs and 15+ yrs) with a natural reference marsh (100+ yrs old). Stable …
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Spatiotemporal Variation in Dispersal as a Driver of Macroinvertebrate Metacommunity Dynamics
Across taxa, community assembly has traditionally been attributed to local processes such as species competition and environmental filtering. Metacommunity theory, however, highlights regional drivers such as dispersal and connectivity as key structuring forces. The mechanisms governing freshwater …
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EVALUATING RISK OF LEAD EXPOSURE IN SCAVENGING SPECIES LINKED TO BIG-GAME HUNTING IN SASKATCHEWAN, CANADA
… remains (Chapter 2) and assessing scavenger community assemblages at kill sites (Chapter 3). In Chapter 2, I compared advanced imaging techniques (Biomedical Imaging and Therapy) with traditional medical x-rays to identify limitations in detecting and quantifying lead fragments in undesired …
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Bottom-up effects of aboveground biota, invasive species and drought on soil animal communities
… nematodes. Changes in their abundance, taxonomic assemblage and/or trophic response indicate the extent of the disturbance effect and the roles these animals play as regulators of the whole soil food web. Specifically, this research investigated the response of microarthropods and nematodes to …
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Variação sazonal da distribuição, abundância e diversidade dos peixes na zona de arrebentação da Praia do Cassino, RS - Brasil
… the study area is apparentely proviging a fish community assemblage different from the adjacent estuary of lagoa dos Patos and coast waters over 5 meters of depth. lt is an important nursery ground and possibly also a transient zone for many species in southern Brazil. Preliminary observations …
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Is meadowlark habitat segregation within sympatry behaviorally mediated?
… selection. It is also widely recognized that community assemblage is influenced by mechanisms beyond simple habitat relationships, such as interspecific competition. Within sympatry, Eastern and Western Meadowlarks establish and maintain mutually exclusive, multi-use territories. However, the …
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Influence of habitat complexity on diversity and community structure of arboreal spiders in grassland-shrub systems
… animal species, such as arthropods, and on local community structure. For instance, vegetation structure provides spatial complexity by creating microenvironments that may enable more interactions with other species that live on plants or allow resource partitioning. In grasslands, much of the …
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Diversity and distribution of Tylosema esculentum (Marama bean) endophytic bacteria communities in Omitara, Harnas and Otjinene, eastern Namibia
… and distribution of endophytic microbial community structures associated with leaves, stems and tuberous roots of T. esculentum in Eastern Namibia. Culture-dependent and PCR-based 454 pyrosequencing methods were used. ANOVA with pairwise comparison revealed a significant difference in …
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Analysis of Hydric Pine Flatwood Ephemeral Pool Macroinvertebrate and Crustacean Assemblages Along a Temporal and Spatial Gradient From a Hypothesized Colonial Source
… survey of the macroinvertebrate and crustacean assemblages in hydric pine flatwood wetlands during fill and drawdown periods was conducted from September to November 1998, in Lee County, Florida. Physical and chemical information, relationships between community composition and physical and …
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Investigation of Miscanthus associated microbiome: effects of biotic and abiotic factors
… support sustainable crop production. Bacterial community functions are directly related to community structures, which rely on surrounding biotic and abiotic factors. Therefore, before Miscanthus-bacteria interactions can be optimized for better plant productivity, it is necessary to investigate …
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The impact of green macroalgal mats on benthic invertebrates and overwintering wading birds.
… feeding relationships between invertebrate assemblages and overwintering migratory wading birds in Poole Harbour - a temperate estuarine ecosystem on the south coast of England. Poole Harbour is designated for its populations of overwintering migratory wading birds. As such, any decline in …