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 37 for “"latitudinal gradient"”.
-
Latitudinal Gradient Facilitates Adaptive Population Differentiation of Campanulastrum americanum (American Bellflower)
… a model for assessing whether an environmental gradient can facilitate local adaptation. In particular, I determined if a latitudinal gradient across eastern United States has influenced the phenology and reproductive fitness of five northern and four southern C, americanum populations. These …
-
COEXISTENCE, RESILIENCE AND RESISTANCE OF MARINE INVERTEBRATE COMMUNITIES ACROSS A LATITUDINAL GRADIENT
… over the course of geological history. The latitudinal diversity gradient is the most well-established and predominantly studied biogeographic diversity pattern on Earth. Higher tropical biodiversity with a decline towards higher latitudes occur in both hemispheres and has been observed for …
-
Remote Sensing of Vegetation Change Across a Latitudinal Gradient in the Canadian Arctic
… to reside along a moisture and altitudinal gradient. The NDVI time series demonstrated an overall significant increase in greening at the CBAWO (High Arctic site), specifically in the dry and mesic vegetation type. However, similar overall greening was not observed for the ARW (Low Arctic …
-
Fish Ladders Designed for Drop Culverts and Central Stoneroller Ecology Across a Latitudinal Gradient
<p>Stream connectivity is essential for the persistence of fish populations and maintenance of fish assemblage structure. Stream-road crossings can become barriers resulting in a loss of connectivity. Creating innovative tools for fisheries managers to allow fish passage through barrier stream-road …
-
Diet of the Tropicalised Herbivore Siganus fuscescens Across a Broad Latitudinal Gradient and Comparisons With Temperate Seagrass-associated Omnivorous Fishes
… was compared across a tropical to temperate gradient, comprising the Kimberley, Shark Bay and Perth. In all regions, red algae were the primary dietary component. Leathery macrophytes were also consumed in the temperate region, while filamentous Sphacelaria was grazed in subtropical Shark Bay …
-
Biogeographical patterns of southern African marine invertebrates
… mechanisms thought to cause this pattern are: gradients in temperature, stress, productivity, competition, predation, stability, effective evolutionary time, niche breadth, range size and area of occupancy. Evidence exists that both supports and negates most of these mechanisms. In addition to …
-
A global study of tropospheric methane chemistry and emissions
… were increased to 585 Tg(CH4) yr-1 with a latitudinal shift to larger tropical emissions. This increase resulted in excellent agreement between modelled and observed methane levels, both globally and in the latitudinal gradient. The 7% methane emission increase also increased tropospheric …
-
Temporal Change in Community Composition, Ecological Niche, and Phenotypic Selection in Minnesota’s Rare Arctic Relict Plants
… after nearly 20 years of climate change across a latitudinal gradient that mimics a range of different degrees of warming. Large temporal dissimilarity in community composition occurred across all sites surveyed, and southern sites showed an overall mean decrease in species richness. Ecological …
-
The Epidemiology and Control of Human Influenza in Vietnam
… households. ILI notifications in Viet Nam show a latitudinal gradient, with seasonality in the north but no seasonal pattern observed in low lying areas of central and southern Viet Nam. Seasonality is however observed in the elevated provinces of central Viet Nam, suggesting that the seasonal …
-
Latitudinální proměna ideálního stromu podle metabolické teorie
… using 75 Betula spp. trees on 25 sites of a latitudinal gradient (mostly in Sweden). There is a lot of studies trying to adress similar questions by working in a framework of metabolic theory of ecology. Considering diameter-height relationship scaling models predict a scaling coefficient …
-
Seasonal Influences on the Carbon-Water Relations in Ponderosa Pine Forests in the Northern Boundary of the North American Monsoon System
… from a network of thirteen sites along a latitudinal gradient extending from southern Arizona and New Mexico, through southwest Colorado, and up to northern Utah. The analysis is based on biological and physical processes and their close relationships with isotope effects to infer …
-
Historical refuges and recolonization routes in the Southern Appalachian Mountains, inferred through phylogeographic analysis of the spotted wintergreen (Chimaphila maculata)
… to assess how genetic diversity varied along a latitudinal gradient, and also to examine the number and geographic range of genetically distinct population clusters. An ecological niche model for C. maculata was generated to identify areas of past suitable habitat. Coalescent modeling was used …
-
Radial growth response of eastern hemlock to infestation of hemlock woolly adelgid
… contrast dendroclimatic relationships across a latitudinal gradient. Six sites spanning the current range of hemlock woolly adelgid (HWA) infestation were selected. At each site, 23 infested eastern hemlocks were cored and two trees were felled at the Virginia site and thin-sectioned using a …
-
Exploring the role of auxin in phenotypic plasticity in Arabidopsis thaliana root development
… architecture. Environmental variables across a latitudinal gradient have been shown to both transiently affect growth, development, and physiological responses, as well drive the evolution of ecotypes with unique genotypes that increase fitness. We hypothesized that early root architecture as …
-
Genomic and physiological adaptation to temperature in the invasive golden star runicate (Botryllus schlosseri)
… across three populations spanning a 24.3° latitudinal gradient while expanding to include differentiation of cold tolerance in adults. Similar to the east coast, I observed that the two northern populations were more susceptible to heat stress than their southern counterpart. For cold …
-
Investigating Causal Relationships between Global Change and Insect Interaction Networks: Insights into Dietary Specialization, Interaction Diversity, and Disturbances
… quantifying effects of biotic and abiotic gradients on dietary specialization, interaction diversity, and related attributes of arthropod communities. My focus on how specialization varies across gradients and is affected by global change addressed a classic hypothesis, the …
-
Genomic and Phenotypic Analyses of Polychaete Sibling Species <i>Platynereis dumerilii</i> and <i>Platynereis massiliensis</i> in Relation to Ocean Acidification
… five geographical areas situated along a thermo-latitudinal gradient along the Italian coasts, characterized by different pH conditions (acid <i>vs</i> normal). A multidisciplinary approach, focused on different aspects of the target species biology, was chosen and the following analyses were …
-
Tropical Pyramids: Dung Beetle Richness, Abundance, and Biomass
… segregate along these divisions. The observed latitudinal gradient may be explained by spatial heterogeneity hypotheses and the body size gradient resembles Bergmann’s rule.
-
Genetic structure of Pseudoroegneria spicata in the Northern Palouse Prairie and Channeled Scablands
… spicata differentiated along a north-south latitudinal gradient instead of between different habitat types. Commercially sourced seeds from a certified source-identified provenance were more closely related to northern sites, while seeds sourced from the larger region were more similar to …
-
Genomic and physiological adaptation to temperature in the invasive golden star tunicate (Botryllus schlosseri)
… across three populations spanning a 24.3° latitudinal gradient while expanding to include differentiation of cold tolerance in adults. Similar to the east coast, I observed that the two northern populations were more susceptible to heat stress than their southern counterpart. For cold …
Page 1 of 2