Global ETD Search
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Showing 1 to 20 of 20 for “"range limits"”.
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Local impacts of global change: shifting range limits, advancing phenology, and communicating research
… (if any) do pollinators play in establishing the range limits of one subalpine flowering plant (published in American Journal of Botany, 2016). I find that in some years, fruit and seed set is limited by pollinators at the high-elevation range limit, suggesting that pollinators may contribute to …
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Population and Conservation Genetics of Crawfish Frogs, Lithobates areolatus, at their Northeastern Range Limits
… with populations in decline throughout their range. I studied populations of Crawfish Frogs on local and statewide scales at their northeastern range limits to (1) assess the level of genetic diversity within populations (2) estimate fine-scale genetic structure, and (3) estimate genetic …
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From Small to Large: Modeling at the Scale of Ecological Processes to Understand Temperate Forest Range Limits, Biomass, and Traits
<p>Over the next century, global change is expected to fundamentally alter ecological communities. Forecasting the consequences of this change requires an understanding of current drivers of ecosystem form and function, yet the scale of available data is often mismatched to the scale of the …
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DISEASE IMPACTS ON MOOSE (ALCES ALCES) HEALTH AND ECOLOGY ALONG THEIR SOUTHERN RANGE LIMITS: PARASITES AS A LIMITING FACTOR IN NEW YORK
… distribution. Populations along their southern range limits in North American have fluctuated repeatedly and contend with varied and likely interacting stressors, including climate change, habitat alteration, conflict with humans, and disease. Moose are hosts for numerous parasite species, some …
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Genomic evidence of long-term asexuality at the northern range limit of wetland plant, Decodon verticillatus (Lythraceae)
… sexual to asexual reproduction at geographic range edges, but the impact of asexual reproduction on range expansion is largely unknown. If asexuality allows genotypes well-adapted to range edge conditions to persist long-term without recombination, this may allow plant species to expand beyond …
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Sensitivity of northern red oak (Quercus rubra L.) to variation of temperature and moisture availability along latitudinal and longitudinal climate gradients
… on tree growth are based on the geographic range limits of a species. These models assume that temperature limitations control the latitudinal range boundaries for tree species in the eastern United States, and that water limitations control the western range boundary. This study …
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Sugar maple (Acer saccharum Marsh.) provenances differ with climate of origin in survival, growth, and traits along a climate gradient: implications for the species' distribution under climate change
Plant ranges, broadly constrained by climate, may be further shaped by interspecific interactions and intraspecific variation in growth and traits. Changing climate and species composition in plant communities lends urgency to the need to better define the factors determining species’ …
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An Investigation of the Factors that Facilitate and Inhibit the Range Expansion of an Invasive Plant
… and where these factors interact to set species range limits. Filling the existing knowledge gaps is imperative for the accurate predictions of how species will respond to global change, and particularly for invasive species, many of which are expected to benefit from global change. Here, I …
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X-Ray Machine Tests and X-Ray Experiments for Undergraduate Physics Laboratories
… First, the machine was tested to find its range limits. Secondly, numerous experiments were designed to use the X-ray machine. Findings. The X-ray machine has a wide range of uses and can be used on an undergraduate level for many laboratories. Dosimeters and film are both very useful tools …
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Quasi-optimal steady state and transient maneuvers with and without thrust vectoring
… including minimum speed, maximum instantaneous range, and maximum sustained turn rate. The transient maneuvers are initiated from straight and level flight and include a longitudinal pitch-up to a desired fuselage pointing angle and a lateral-directional transition (wind-up) to a desired steady …
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A landscape approach to forecasting climate change impacts on geographic ranges and phenologies of plants in the Washington Cascades
… of climate change on plants in the Cascade Range (Washington, USA), where rapidly changing climate and hydrology pose unique risks to features of ecosystems that are economically and culturally important. Chapter one concerns the fundamental ecological processes that maintain the geographic …
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Equilibrium moisture content measurement for porous building materials at various temperatures
… from further investigating the operating range of an existing experimental apparatus and procedure. During the course of the research, the operating range and control of the existing apparatus were extended, and its temperature range was tested for the first time. The apparatus is composed …
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A methodology for mapping probable ranges of endangered terrestrial mammals within selected areas of Virginia
… used traditionally for predicting biological range limits. Maps based on these data may be inaccurate and may not provide useful information regarding the ranges of endangered species. A method was presented for predicting probable ranges of mammals based on the distribution of environmental …
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The effects of an invasive species on the structure of native ecosystems
… which represent the northern and southern limits of this species in Europe. Long-term monitoring of the colonisation of space by A. modestus and native barnacle species in Ireland revealed a general pattern of coexistence, despite dominance of the non-native species at the majority of study …
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Phylogeography of eastern leatherwood (Dirca palustris L.) resolved by chloroplast sequencing and microsatellite genotyping
… nearly 2000 km to contemporary northern range limits. The rates of migration necessary to account for present distributions exceed those suggested by contemporary observations of seed dispersal. I used ecological niche modeling, chloroplast sequencing, microsatellite genotyping, and …
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Adaptation of an invasive grass to agriculture: ecological and genomic evidence
… and genetically across their environmental range limits, and this variation can influence ecological processes. Ecologically meaningful intraspecific variation might be particularly important in the context of agricultural weeds and exotic invaders, because intraspecific variation in these …
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Radial growth patterns of jack pine in relation to climate, moisture availability, and dwarf mistletoe infection in the Boreal Plains Ecozone of Saskatchewan, Canada
… diseases could lead to forest fragmentation and range contractions. Lodgepole pine dwarf mistletoe (Arceuthobium americanum) (DM) is a host specific, parasitic plant of jack pine (Pinus banksiana) that affects resource allocation, water use, and growth. Despite being one of the most damaging …
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Model reference control for ultra-high precision positioning systems
… cost. However, the relatively small displacement range limits its application. This work proposed a practical ultra-high precision piezoelectric positioning system with a complementary high displacement range actuation technology. Solenoids are low cost, high speed electromagnetic actuators which …
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Methodologies and Applications of Data Coordinate Conversion for Roadside LiDAR
… visibility of the data. Secondly, the detection range limits its further development. Although LiDAR can detect data within 200 m from itself, the effective detection range is 50~ 60 m. What's more, the occlusion issue occurred from time to time.To overcome these limitations, data mapping and …