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 64 for “"ecoregions"”.
-
Biogeographical detection of Holocene climate refugia in Italian Ecoregions: an applied proposal
L'abstract è presente nell'allegato / the abstract is in the attachment
-
Diets of fishes among and within ecoregions of the US and Mongolian rivers
… and Mongolia to compare diets within and among ecoregions and continents. We looked at the Western Great Basin and Wyoming Mountain Steppe in the United States and the Mountain Steppe in Mongolia. US sites had higher proportions of invasive species and higher dietary overlaps among species than …
-
Correspondence Between Aquatic Ecoregions and the Distribution of Fish Communities of Eastern Oklahoma
… Oklahoma to determine whether existing aquatic ecoregions provide the best framework for spatial classification for the development of biological assessment methods and biocriteria. I used indirect ordination and classification to identify groups of sites that support similar fish communities. …
-
Assessing Subterranean Arthropod Diversity through COI Barcoding in Two Ecoregions of Southwestern Virginia, USA
… in the Ridge and Valley and Blue Ridge ecoregions of Virginia, USA in the winter and spring. In total, 2,260 arthropod specimens were collected constituting 319 distinct species. I extracted and purified DNA and amplified the mitochondrial gene: cytochrome C oxidase subunit I (COI) from …
-
Development of Biological Reference Conditions of Wadeable Streams in the Major Ecoregions and Subecoregions of Georgia
<p>One bioassessment tool available to resource managers to indicate NPS impairment of wadeable streams and rivers are multi-metric invertebrate indices. Such indices are assembled from metrics in broad categories that represent different aspects of community structure and function (e.g. richness, …
-
SEASONAL FLAMMABILITY COMPARISONS OF NATIVE AND EXOTIC PLANTS IN THE POST OAK SAVANNAH, BLACKLAND PRAIRIE, AND PINEYWOODS ECOREGIONS OF TEXAS
… Post Oak Savannah, and Blackland Prairie Ecoregions during the dormant (February) and growing (August) season. Oxygen bomb calorimetry (OBC) and proximate analyses estimated ash-free net heat content (NHC-AF; MJ kg<sup>-1</sup>) and proportions of volatile matter (VM%), fixed carbon (FC%), …
-
Analysis of QA/QC Protocols and Value of Data to the Development of Reference Criteria in the Georgia Ecoregions Project
… the invertebrate data produced by the Georgia Ecoregions Project, the consistency of all metric categories having average precision measures above the prescribed MQOs for both raw metric values and standardized metric scores may demonstrate that the lotic systems across the state of Georgia …
-
Vegetation Variability and Its Hydro-Climatologic Dependence
… Central Basin and Range, and Northern Rockies Ecoregions (CEC/EPA Level III Ecoregions), which exhibit large inter-annual vegetation variability, are chosen as the focus of the second phase of the current research. These ecoregions represent areas with complex terrain, minimal anthropogenic …
-
Hydrogeomorphic characterization and classification of Pacific Northwest mountain streams for biomonitoring
… to determine the extent of stream degradation. Ecoregions are the predominant spatial units within which stream reference conditions are developed, but they neglect important valley- and reach-scale influences on stream habitats. Few existing classifications integrate hydrologic and geomorphic …
-
HERBIVORY IMPACTS ON GROWTH AND SURVIVAL OF SEEDLINGS IN BOTTOMLAND HARDWOOD FOREST RESTORATION SITES IN THE POST OAK SAVANNAH AND BLACKLAND PRAIRIE ECOREGIONS OF TEXAS, USA
<p>Interest in bottomland hardwood forests (BLHW) ecology and restoration has increased over the past 40 years. These communities aid in water quality improvement, streambank stabilization, and urban expansion mitigation. They also provide important habitat for many species of wildlife. Since the …
-
A Comparison of Land Use and Land Cover in Public Lands of the Northwestern Great Plains and High Plains Ecoregions and the Implications For Grassland Birds
… avian species richness. My study focused on two ecoregions, the Northwestern Great Plains and the High Plains, which comprise a substantial portion of the U.S. Great Plains, the continental Central Flyway for migratory bird species. The Great Plains provide critical nesting habitat for grassland …
-
Nutrient Cycling in Microdose Fertilized West African Soils Under Indigenous Vegetable Production
… for both vegetables, and yield in soils of both ecoregions increased with increasing nitrogen (N) input up to 60 kg N ha-1 but decreased at 80 kg N ha-1. Using manure+urea increased vegetable yields in both ecoregions, and cultivating AC caused a reduction in soil pH and CEC in soils of both …
-
An Investigation of Spatial and Temporal Variability in Several of Montana's Reference Streams: Working Toward a More Holistic Management Strategy
… represent four of Montana’s seven Level III ecoregions: Middle Rockies, Northern Rockies, Northwestern Glaciated Plains, and Northwestern Great Plains. Variability in stream temperatures between ecoregions, between streams within ecoregions, and the air-water temperature relationship were …
-
An Investigation of Spatial and Temporal Variability in Several of Montana's Reference Streams: Working Toward a More Holistic Management Strategy
… represent four of Montana’s seven Level III ecoregions: Middle Rockies, Northern Rockies, Northwestern Glaciated Plains, and Northwestern Great Plains. Variability in stream temperatures between ecoregions, between streams within ecoregions, and the air-water temperature relationship were …
-
Developing an index of biotic integrity (IBI) for warmwater wadeable streams in Virginia
… across landscape classes (e.g., physiographies, ecoregions) and stream sizes helps one determine appropriate regions and stream-size ranges in which to develop and use the IBI. The IBI’s utility depends on how accurately and reliably each metric reflects disturbance. I make recommendations for …
-
Extent of Alabama's terrestrial nature reserve system in representing ecosystem diversity: a coarse filter gap analysis
… and characteristics of nature reserves across ecoregions; and 2) to analyze where gaps in the Alabama nature reserve system existed and to characterize the drivers of the identified gaps in nature reserve coverage. GIS shapefiles of reserves were collected. A database featuring the total number …
-
Novel disturbance regimes in the Arctic: paleoecological perspectives on fire and thermo-erosion from Alaskan tundra
… increased in frequency and magnitude in tundra ecoregions in recent decades. These novel disturbance regimes could increase the role of the Arctic in exacerbating climate warming through the release of large carbon stocks stored in frozen soils. Fires can directly release soil carbon through …
-
Sediment Management for Aquatic Life Protection Under the Clean Water Act
… aquatic insect community data collected within 5 ecoregions of the state indicates that a combination of 9 sediment parameters reflecting dissolved, suspended, and bedded forms explains between 20.2% and 76.4% of the variability in the health of the aquatic insect community within these regions. …
-
Fish Community Assembly in the Forest River, North Dakota, and Resolution of Campostoma Species Presence
… patterns at two scales: level III and level IV ecoregions. The final aspect of my study was to investigate habitat preferences of fishes in the Forest River. I sampled fish by macrohabitat and compared the results to a similar study. In the determination of the Campostoma species present, I …
Page 1 of 4