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 101 for “"environmental gradients"”.
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Growth patterns along environmental gradients of tropical pomacentrid fishes
The goal of this thesis is to evaluate latitudinal patterns in the life history traits, standard metabolic rates, and growth potential of two geographically widespread damselfishes, the dispersing Pomacentrus moluccensis (Bleeker 1853) and the brood-caring Acanthochromis polyacanthus (Bleeker 1855) …
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Environmental Gradients Impact Key Leaf Traits in Riparian Trees
<p>Specific leaf area (SLA) reflects a plant’s carbon investment per area and relates to generalized leaf economics spectrum growth strategies (LES). To fill gaps of knowledge about intraspecific SLA variation and why it is often inconsistent with the LES, we studied the response of two riparian …
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Plant introductions and community dynamics across environmental gradients in Great Lakes coastal wetlands
Great Lakes coastal wetlands provide vital ecosystem services, including water quality improvement, flood mitigation, and fish and wildlife habitat. However, many of these wetlands have been lost, and those that remain face various threats, including invasion by nonnative plants. Within coastal …
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Nutrient Limitation of Upper Great Lakes Periphyton across Large Spatial and Environmental Gradients
… Lake Michigan, and Green Bay that spanned broad gradients in shoreline land use and water column conditions. To understand the drivers of periphyton isotopic values and elemental composition, δ13C, δ15N, and C:N of periphyton growing on natural substrata were also measured at each site. Results …
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Benthic protozoan community attributes in relation to environmental gradients in the Arabian Sea
“Live” (stained) and dead macrofaunal (>300 ?m fraction) foraminifera in multicorer samples (0-1 cm and 0-5 cm layers) were analysed at six stations along a transect (100-3400 m water depth) across the Oman margin (Arabian Sea) oxygen minimum zone (OMZ). Very high abundances (2858 per 25.5 cm2), …
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Vegetative oil yield and agronomic performance of vegetative oil sorghum across environmental gradients
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-05-01
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Soil microbial community structure and function along environmental gradients: implications for wetland nitrogen cycling
Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2014-02-01T11:00:27Z
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Positive and negative dynamics of plant-plant interactions along environmental gradients: Effects at individual and community level
Ergebnisse großer Grünland-Biodiversitätsexperimente legen einen positiven Zusammenhang zwischen Artenvielfalt und Ökosystemfunktionen (z.B. Produktivität, Ressourcennutzung, Stabilität der Gemeinschaften) nahe. Der durch Klima- und Landnutzungswandel andauernde Artenverlust bedroht die …
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Performance of northern red oak (Quercus rubra) underplantings under five management regimes and across existing environmental gradients
… to forest management regimes across the environmental gradients of physiographic province, aspect, and fencing levels. Management regimes included 1) control sites, 2) a single prescribed burn, 3) repeat prescribed burns 5) diameter-limit cuts and 4) the seedcut of a shelterwood harvest. …
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Mixed-Silver Maple Forests Of The Upper Mississippi River Floodplain: Variations In Composition, Structure, And Growth Along Environmental Gradients
… specifically aspects of hydrology. The role of environmental variation in overstory composition, structure, and growth is not well documented. Goals of this study were to 1) characterize current stand conditions along gradients of inundation and relative elevation, and 2) describe growth …
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Comparative analysis of aquatic insect, amphipod, and isopod community composition along environmental gradients in rheocrene spring systems of Missouri
… systems in Missouri, in some of which associated environmental gradients were also measured. The goal of this study was to create a comprehensive list of species present in all studied systems, as well analyze changes in community composition among and within spring systems in relation to …
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Natural Environmental Gradients Predict The Microhabitat Use, Fine-Scale Distribution, And Abundance Of Three Woodland Salamanders In An Old-Growth Forest
… amphibians－are particularly responsive to gradients in environmental conditions. Because of their functional dominance in terrestrial ecosystems, woodland salamanders are responsible for the transformation of nutrients and translocation of energy between highly desperate levels of trophic …
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Interannual Variability of Lotic Macroinvertebrate Communities in the Kootenay-Columbia Basin, BC: the Relative Contribution of Environmental Gradients vs. Stream Water Temperatures
… used to assess biological impacts of long-term environmental changes. This study utilizes Environment and Climate Change Canada climatic, hydrometric, and Canadian Aquatic Biomonitoring Network datasets to examine the influence of stream temperature and environmental variables on interannual …
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A mechanistic framework for understanding prairie stream fish distributions
A fundamental goal of ecology is to understand environmental associations of species. These associations can provide a basis for predicting spatial distributions in contemporary habitats as well as how those distributions might change in response to anthropogenic environmental change. Developing …
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The Effect of Ecological Gradients on the Fish Assemblages of the Green and Tradewater River Basins of Kentucky
… River Basins were associated with local scale environmental gradients and, if so, which gradients were the most important in shaping fish assemblages and which fish species were most closely associated with these gradients. A secondary purpose was to determine which regionalization or …
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Effects of Biotic Interactions on Climate-Growth Relationships of Douglas-Fir and Ponderosa Pine
… history strategies and within a species across environmental gradients. Moreover, plant-plant interactions may directly affect both intrinsic variables and local environment through direct effects on resource availability and habitat structure. Yet, despite general scientific agreement that the …
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Effects of Biotic Interactions on Climate-Growth Relationships of Douglas-Fir and Ponderosa Pine
… history strategies and within a species across environmental gradients. Moreover, plant-plant interactions may directly affect both intrinsic variables and local environment through direct effects on resource availability and habitat structure. Yet, despite general scientific agreement that the …
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Community gradients in the Martinsburg formation (Ordovician), southwestern Virginia
… most species are distributed independently along environmental gradients according to their individual requirements. Steep gradients often produce species associations separated by discontinuities; gradual gradients produce broadly-overlapping distributions. Approaching the distribution of species …
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Responses of Boom-Forming Phytoplankton Populations to Changes in Reservoir Chemistry and Physics
… to dam) and vertical (surface to sediments) environmental heterogeneity, which plays a large role in determining phytoplankton population dynamics. In this thesis, I explore how three bloom-forming phytoplankton taxa, the dinoflagellates Peridinium and Gymnodinium, and the cyanobacterium …
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Assessing the Effects of Biotic and Abiotic Factors on Ephedra viridis Seed Size
… equal. Several pre-dispersal and post-dispersal environmental factors affect the quality of seeds plants produce, the seeds available for dispersal, and the likelihood of seedling establishment/survivability. In this dissertation, I utilized the desert shrub Ephedra viridis to investigate three …
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