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 10 of 10 for “"elevational range"”.
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Impacts of climate warming on range shifts with emphasis on tropical mountains
Climate warming induced range shifts are evident globally for a wide range of taxonomic groups. However, whether such responses have taken place in tropical insect species is unclear. I provided the first such evidence that tropical insects have moved uphill over four decades of climate warming. I …
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A Global Conservation Assessment of Temperate Forests: Status and Protection
… across naturally occurring geographic and elevational ranges. My results indicate that protected temperate forests do not represent the full geographic and elevational range of naturally occurring temperate forests. Bias in location, elevation and slope of protected areas are present at …
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Seed predation along an elevational gradient in the Tropical Andes, Peru
… from species traits such as seed size or current elevational range? And (3), what may be the underlying cause of variation in seed predation rates in terms of ecosystem productivity and associated animal communities? Species exhibited marked variation in total seed predation and in seed predation …
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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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A Spatio-temporal Phylogenetic Approach to Community Ecology
… different phylogenetic patterns for the trait, "elevational range size". From my findings, I caution against the use of a single spatial or phylogenetic scale, as it may lead to different conclusions about the data. For angiosperms in a plant community in Toronto, I show that species trait and …
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Ecological Gradients in Diversity and Abundance: A Search for Patterns and Processes in Small Mammal Communities
… have been proposed to explain latitudinal and elevational diversity gradients, but no accepted, general explanation for the distribution of biodiversity has surfaced. Two necessities for establishing a general diversity theory are utilizing more rigorous statistical methods to test hypotheses, …
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Phylogeny of the wasp subfamily Metopiinae and patterns of speciation in the Exochus albiceps species-group
… seeking to elucidate the relationship between elevational range and niche breadth. Segregation in the environmental space was found between species inhabiting the lowlands and the ones inhabiting montane regions. There is niche partitioning among the species that inhabit in montane regions …
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Patterns and Disturbance-Induced Drivers of Plant Diversity and Endemism on High Elevation Islands
… to low latitudes. Characteristic features are elevational range reaching more than 1000m a.s.l. and possessing ecosystems ranging from coastal to alpine systems. The alpine treeline, as the borderline between forest and treeless alpine systems, is therefore fundamental in describing HEIs. …
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Desplazamientos altitudinales y características ecológicas de los abejorros (Bombues Spp.) de la Cordillera Cantábrica
… of these declining species. The Cantabrian Range (NW Spain) has an exceptionally high diversity of bumblebee species and constitutes the southern limit of distribution for many of them. This thesis focuses on the potential changes in distribution and abundance of bumblebee species in a …
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Conservation of endemic species in China
… 1, I first used detailed data on geographical ranges for endemic forest species to identify patterns of species richness. After refining each species' range by its known elevational range and remaining forest habitats as determined from remote sensing, I identified the top 5% richest areas as …