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 90 for “"indicator species"”.
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Using Benthic Indicator Species and Community Gradients to Optimize Restoration in the Arid, Endorheic Walker River Watershed, Western USA
… approach was employed using a combination of indicator species analysis, cluster analysis, canonical correspondence analysis, and community tolerance indices to evaluate the variation of benthic macroinvertebrate community composition across a set of environmental gradients. Results …
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Vegetation patterns along the Middle Fork of the Flathead River, Glacier National Park, Montana
… on riverine floodplains is dictated, in part, by species' response to flood disturbance. Plant position can be related to frequency, intensity and duration of flooding, with species most tolerant of flooding occurring in lower discharge classes and those less tolerant occurring in higher discharge …
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The investigation of regional ecology using 2km x 2km scale botanical distribution data
… 1995 - 2009, were analysed using Two Way Indicator Species Analysis and Principal Components Analysis, explored using GIS, to examine major floristic distribution patterns. Environmental data were also examined using Redundancy Analysis. The strongest floristic trend was a human influence …
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Seed mix design and application to overcome seed limitation in floodplain forest restorations
… focused primarily on the establishment of canopy species, operating under the assumption that understory species will naturally recolonize. However, the compositional differences between restored and reference forest understories are apparent. To enhance the compositional similarity of restored …
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Restraurant regions : an ecological community based model of restaurant chain distribution in the United States
… chain was treated as an individual biological species, and the clustering software analyzed it as such. The individual restaurant chain locations were treated as individual samples in the environment. Wards (1963) algorithm was used to group the individual restaurant chain locations into …
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MYCOBIOME ANALYSIS OF TREES SELECTED BY BLACK-CAPPED CHICKADEES (Poecile atricapillus) AS NEST SITES
… Overall, I identified 201 fungal OTUs to species level. Among the fungal OTUs identified to phylum level, 706 (63%) belonged to Ascomycota, 284 (25%) Basidiomycota, four (0.35%) Mortierellomycota, two (0.2%) Glomeromycota, two (0.2%) Mucoromycota, while 122 (11%) fungal OTUs could not be …
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A critical assessment of botanical indicators as historic markers in wooded landscapes
… assessed the role and value of using botanical indicators as historic markers in wooded landscapes that comprise woodlands and hedgerows. These are linked by social history and ecology. In both habitat types, there have been recent attempts to determine their age and origins based on current …
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Vegetation ecology of springs: ecological, spatial and temporal patterns
… precondition for the identification of indicator species. The complexity of ecosystems and ecological processes hampers this quest oftentimes. Springs provide a natural setting that minimises such constraints. Compared to other habitat types, external factors are less relevant, which …
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CHARACTERIZING PATTERNS IN TEXAS GULF COAST BEACH DUNE PLANT SPECIES COMPOSITION
… percent bare sand, percent vegetative cover, and species richness. Cluster Analysis, ANOSIM, and SIMPER results indicate that Texas beaches can be divided into northern and southern regions based on differences in species composition of plant communities. Indicator Species Analysis (ISA) indicates …
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Ecological studies of benthic macroinvertebrates for determining sedimentation impacts in Chattahoochee National Forest streams
… correlated with percent deposited sediment. Indicator species analysis found a number of taxa that were associated with a four-level grouping of percent deposited sediment levels. Therefore, a final study involved calculating deposited sediment tolerance values using indicator species …
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Effects of Prescribed Burns on Small Mammal Populations with Comments on Houston Toad Populations
… management has been an important tool to improve species diversity within a forest. Fire suppression and habitat fragmentation in Southern pine forests have resulted in habitat composition changes, potentially causing negative impacts on endemic species. Implementing prescribed fire helps restores …
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Manipulating the root mycobiome to improve plant performance and reduce pathogen pressure in corn (Zea mays)
… grown in low yield control soils. However, indicator species varied across primary inoculation treatments and controls. Although corn grown in an autoclaved substrate showed growth promotion with the fungal inoculant Fusarium oxysporum, no fungal inoculant added to low productivity soils …
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Plant Community Responses to Long-Term Seasonal Bison Grazing in the Dry Mixed Grassland of Saskatchewan
… Plains bison (Bison bison bison) are a keystone species, it is not fully understood how plant communities respond to seasonal bison grazing. This study investigated plant community responses to long-term dormant and growing season bison grazing as well as an ungrazed control. The study took place …
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Changes in the microbial community of Lubomirskia baicalensis affected by Red Sponge Disease
… lake and a unique ecosystem, home to several species of fresh water sponge. A disease outbreak affecting the dominant species, Lubormirskia baialensis, was recently reported. The cause of the disease has not been determined but one of the current hypothesis is that the increase in methane …
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Assessment of mudpuppy (Necturus maculosus) presence along the St. Clair-Detroit River System using environmental DNA and occupancy modeling
… is lacking, and since they are important bio-indicators, they could be a gauge for restoration success. Environmental DNA (eDNA) and occupancy modeling were used to determine best detection practices for this cryptic species. Mudpuppy eDNA was detected at all known mudpuppy sites with the …
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A gradient analysis of Coleogyne communities in Southern Nevada
Species richness, density, and abundance in Coleogyne ramosissima (blackbrush) shrublands were compared on 15 elevational transects in the Spring and Sheep Mountain Ranges adjacent to the Las Vegas Valley. Coleogyne shrublands shared relatively broad upper and lower ecotones with Pinus-Juniperus …
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The Effects of Diet and Predation on Nesting Herring Gulls (Larus argentatus) in Pukaskwa National Park
… gulls (Larus argentatus) are used as ecological indicators of the coastal Lake Superior ecosystem in Pukaskwa National Park. Their populations have declined by 70% over the last 40 years, suggesting changes in the park ecosystem. I assessed herring gull diets and investigated how diet may …
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Responses of Aquatic Benthic Macroinvertebrate Communities to a Large Flow Pulse in the Guadalupe, San Antonio and Brazos River Basins, Texas
… BMI taxa found in this study provide potential indicator species for environmental flow standards assessments, although the ubiquitous use of these indicator species across and within drainages is limited.
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Abundance Of Songbirds In Eastern Hemlock Stands Following Chemical Treatment For Hemlock Woolly Adelgid
… their effects on hemlock dependent avian species are largely unknown. A 2009 study, which took place as HWA was beginning to invade Kentucky, identified six indicator species that were positively and negatively correlated with eastern hemlock stands throughout the Appalachian Mountain …
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Neogene to quaternary foraminifera from the western margin of southern Africa
… of the Namibian shelf sediments. The planktic indicator species Globoquadrina dehsicens and Globigerinoides bisphericus support strontium isotope stratigraphy results for the olive-green mud unit of the northern Namibian shelf indicating an age of 16 to 14 Ma, and the overlying Plio-Pleistocene …
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