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 35 for “"elevational gradient"”.
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Habitat partitioning by sparrows along an elevational gradient
Although species replacements along environmental gradients are commonly attributed to interspecific competition, predictions of what species distributions would be in the absence of competition are usually lacking. I tested alternative hypotheses that might account for species distributions …
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Seed predation along an elevational gradient in the Tropical Andes, Peru
… study of plant distributions along environmental gradients, on which biotic interactions exert a large impact. Post-dispersal seed predation is a plant animal interaction that affects the population dynamics, community structure, and diversity of plant species through time and space. This thesis …
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Tree community assembly and biogeochemical processes along an elevational gradient in western Panama
… their plant community response to global change. Elevational and environmental gradients are key elements in our understanding of the effect of climate, edaphic and biotic interactions in plant community assembly and biogeochemical processes. Changes in environmental and biotic conditions are …
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Bee Abundance Along a Tropical Montane Elevational Gradient and Implications for Crop Pollination Services
… plants. There is an urgent need to document elevational distributions and thermal specialization for tropical bee species to understand how these important pollinators may respond to warming temperatures. My four-year study (2016-2019) aims to quantify bee abundance differences across an …
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Ant diversity across an elevational gradient; functional versus taxonomic perspectives in the Soutpansberg Mountains, South Africa
… and sensitivity to habitat change. Environmental gradients are central in our attempt to address these shortfalls gauging these organisms' responses to environmental change and ultimately in the search for general rules of community assembly. In this study I focus on ants in a long-term monitoring …
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Forest Structure, above-Ground Carbon Stocks, and Productivity along an Elevational Gradient in the Ecuadorian Andes
… and variation in environmental parameters along elevational gradients. In particular, the mechanisms that control above-ground carbon stocks (AGC) and natural dynamics in mountain ecosystems constitute a potentially powerful tool for understanding the function of these ecosystems and their …
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Microbial respiration on decaying leaves and sticks along an elevational gradient of a southern Appalachian stream
… among four (2nd-4th order) sites along an elevational gradient at Coweeta Hydrologic Laboratory, North Carolina. Rhododendron and birch leaves were placed in mesh bags in the stream at each site on 21 Oct 90. Oxygen uptake rates were measured for both leaf species beginning 15 Dec 90 and …
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Using species accumulation curves to study change through time in a diverse butterfly fauna along an elevational gradient
The motivation for this thesis comes from ecological questions about the variability in the population dynamics of butterfly species across geographically diverse locations within Northern California. The goal of this thesis can be summarized in the following parts: i) to parameterize and fit the …
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Using species accumulation curves to study change through time in a diverse butterfly fauna along an elevational gradient
The motivation for this thesis comes from ecological questions about the variability in the population dynamics of butterfly species across geographically diverse locations within Northern California. The goal of this thesis can be summarized in the following parts: i) to parameterize and fit the …
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Small Mammal Species Richness And Relative Abundance Across The Elevational Gradient And Microhabitats Of Pine Mountain, Eastern Kentucky
<p>Identifying microhabitat conditions influencing species abundance is critical to understanding distributions of species. Pine Mountain has forest types uncommon in Kentucky, but systematic small mammal surveys are dated. My objectives were: investigate variation in small mammal occurrence on …
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Climatic specialisation: an explanation for the range size and distribution of bryophytes on a tropical island elevational gradient
… using a very specific system: bryophytes on the elevational gradient of Piton des Neiges, Réunion Island. Bryophytes are expected to be specialised to fairly narrow conditions of drought, temperature and insolation, which restrict their geographic range. However, little is known about the …
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Spatial Learning and Memory, Cognitive Flexibility, and Rule-Learning in Food-Caching Mountain Chickadees (Poecile gambeli) Across an Elevational Gradient
How and why individuals differ in their cognitive abilities within and across species remain important and unresolved questions in behavioral and evolutionary ecology. Cognitive traits are involved in many critical behaviors, enabling individuals to use past experiences to inform future decisions …
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Diversity and biogeography of Madagascan bryophytes with an analysis of taxic and functional diversity along an elevational gradient in Marojejy National Park
… and assemblage of communities along an elevational gradient in Marojejy National Park, north-eastern Madagascar. Firstly, based on literature reviews and available herbarium data, I examined the bryophytes of Madagascar through a historical, floristic and phytogeographic synthesis. …
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WATER SOURCES AND ECOPHYSIOLOGY OF SELECTED RIPARIAN SPECIES OF THE SOUTHERN APPALACHIAN MOUNTAINS, USA
… exhibiting strong spatial segregation along an elevational gradient (V). Finally, the hydraulic properties of these shrubs were examined in regards to adaptive leaf orientation during periods of light and water stress (VI).
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Hummingbird Hovering Energetics and Flight Capacities Across Elevational Gradients
… and aerobic capacities for exercise across an elevational gradient, and examines possible morphological adaptations associated with life at high elevations. Using hummingbirds, a group of animals with high hovering metabolic rates and wide elevational distributions, I examine the flight …
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Early Life History Stage Dynamics Across the Elevational Ranges of Andean Trees
… geographic ranges are predicted to occur along elevational gradients, particularly with respect to temperature, as latitudinal gradients in temperature are shallow or nonexistent. To move upslope species will have to disperse to new areas and contend with novel combinations of biotic and abiotic …
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Applying Wetland Rating Systems to Assess Functions of Depressional Wetlands Created by a Mass Wasting Feature, Table Mountain, Washington
… geology, and vary in aspect and elevation. The elevational gradient of the sites ranges from 1300 – 1600 m and the individual wetlands differ in terms of north- and south-facing aspects. Until this research, no studies had analyzed wetland function by using the Washington State Wetland Rating …
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Discerning Differences in the Plant Traits of the Floral Communities of Mt. Washington, NH, by Incorporating Intraspecific Variability Analysis
… availability). Comparing plant traits along this elevational gradient, from alpine to sub-alpine using measures of intraspecific variability, allows us to investigate any underlying effects. These include differences in air temperature, light availability, and solar radiation. As a result, …
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VERTEBRATE COMMUNITY CHANGES ACROSS A 3200M AMAZON-TO-ANDES GRADIENT: COMPOSITION, STRUCTURE, AND OCCUPANCY
… both mammal and bird species along two parallel elevational transects composed of tropical montane cloud forest. In 2016, we replicated and extended the survey along one transect, setting 80 cameras from 3578 to 519 m a.s.l. We use these findings in conjunction with existing range hypotheses to …
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Life history, diversity and patterns of bat community structure in the Spring Mountains of southern Nevada
… investigated. Species diversity varied along an elevational gradient. Local diversity was lowest at high elevation, Pine-fir sites, and highest at low elevation, Pinon-juniper sites. Explanations for this pattern are offered based on significant correlations between bat diversity and a number of …
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