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 431 for “"Species Diversity"”.
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Processes determining plant species diversity in restored tallgrass prairie
… of restoration ecology is to restore biological diversity in degraded or fragmented environments. In practice, restorations often have lower diversity than reference communities, highlighting a need to identify theoretical and practical barriers to the restoration of native diversity. North …
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Stochastic Dynamics Models of Plant Population and Species Diversity
This study presents sophisticated error analysis of the Shannon index in time and space. Error of current estimate increases proportional to measurement while the total forecasting error increases very fast in time. Spatial variation contributes the most to the total error of the Shannon index. …
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Analysis of Bacterial Abundance and Species Diversity in Various Soils
… of nutrient content, microbial abundance and diversity. Many of the microbes viable in soil have practical functions in the agricultural and medical fields while others are pathogenic. Garden topsoil, potting soil, forest soil, compost and manure were the five soil types investigated in this …
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Modelling spatial turnover patterns in tree species diversity for conservation
The planet’s biodiversity is increasingly threatened by the effects of rapid environmental change. Biodiversity loss led by expanding anthropogenic activity, combined with the effects of changing climatic regimes, pose a threat to natural communities and the ecosystem services that they underpin. …
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The Carbon Density and Species Diversity of Myanmar's Tropical Forests
… on evaluating how carbon storage and tree species composition in Myanmar's tropical forests are affected by its management history and environmental factors. Chapter 1 introduces the ecology of Myanmar’s forests. It describes historical and current forest management systems and the nation’s …
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Species Diversity of Benthic Macroinvertebrates in the Des Moines River, Iowa
… Community structure was analyzed with species divorsity indices. Species diversity (D) and redundancy (R) values were used to calculate standardlzed distance (SD) values. The indices were analyzed statistically. Findings. The average D values ranged from 1.62 to 1.94. Mean standardized …
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Adding species diversity to a reconstructed prairie using an incremental approach
1 PDF file (viii, 143 pages)
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Herbaceous species diversity, redundancy and resilience of Mopaneveld across different land-uses
… to which anthropogenic disturbances affect plant diversity and function of the herbaceous layer. This study aimed to quantify the effect of various land-use practices on herbaceous plant community structure, which included productivity (biomass) as well as richness, evenness and diversity at …
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Changes in stand structure and species diversity following clearcutting in central Appalachian hardwoods
… hardwood forests may cause a reduction in species diversity of the new cohort. This study measured changes in species composition, diversity, and stand structural characteristics following clearcutting of a second-growth hardwood forest. To evaluate the temporal changes in importance of …
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Species diversity, genetic structure and variability of begomovirus populations infecting tomatoes in Ecuador
O gênero Begomovirus (família Geminiviridae) inclui vírus com genoma de DNA de fita simples, que infectam espécies de plantas dicotiledôneas e são transmitidas pela moscabranca Bemisia tabaci. Doenças causadas por begomovírus são economicamente importantes por causarem grandes perdas em culturas …
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Productivity and nutrient relations of trees in deciduous forests differing in tree species diversity
Die Effekte der Biodiversität auf die Ökosystemfunktionen von Wäldern werden mit steigendem Interesse diskutiert. Ein Schwerpunkt der Debatte liegt dabei auf dem Einfluss der Artenzahlen als auch der funktionellen Gruppen auf verschiedene Ökosystemfunktionen, wie zum Beispiel der Primärproduktion, …
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Integrative approach to discovering species diversity within the Mediterranean group of the Bemisia tabaci complex
Bemisia tabaci is a complex of cryptic whitefly species, which includes some of the world’s most damaging agricultural pests. The Mediterranean (MED) putative species is globally invasive and its populations are often resistant to insecticides. The intra-species genetic variability identified in …
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Prairie Restoration and Species Diversity: A Comparison of Propagation Success Between Seeded and Planted Forbs
… the world, supplying homes to hundreds of native species, and conserving soil and water. The deep rooted forbs prevent water runoff and soil erosion. Economically the prairies have provided medicines, commercial forbs, and aesthetically pleasing landscapes for humans. Society is dependent on the …
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Phylogenetic and functional characterization of human microbiome intra-species diversity and tracking of early-life transmission
… is currently rather well characterized at the species level. Yet, each of these species harbor a tremendous amount of individual genetic variations. Our understanding of the human gut microbiome, its dynamics, composition and impact on host health requires a deeper characterization of its …
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The Influence of Livestock grazing on Plant Species Diversity and Distribution at Kiranjeranje Ward-Kilwa District
… between environmental variables and plant species Diversity and distribution in Kiranjeranje ward was studied using multivariate gradient analysis. Vegetation data were collected in 30 established plots using the stratified random sampling method. For each plot established environmental …
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Groundfish species diversity and assemblage structure in Icelandic waters during a period of rapid warming (1996-2007)
Hlýnandi loftslag undanfarinna ára hefur valdið breytingum á útbreiðslu fiskitegunda á norðurhveli jarðar. Ólík svörun tegunda við hækkandi hita getur leitt til breytinga á samfélagsgerð og staðbundnum tegundafjölda. Í kjölfar breytinga á sjávarhita hafa verið skráðar breytingar á stofnstærð og …
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Impact of the Tsumeb smelter waste on plant species diversity and structure in Tsumeb, north-central Namibia
… the impact of the smelter waste on plant species diversity and structure in the Tsumeb area. The most important sources of contamination are solid and gaseous emissions from the Tsumeb Smelter, airborne particles from the Tsumeb tailings pond and airborne particles from slag mill waste. …
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Leveraging the Landsat archive to characterize plant species diversity and post-fire recovery in Great Basin shrublands
… variation in spectral values relates to plant species diversity, which, in turn, is theorized to be an important predictor of resilience to disturbance and resistance to invasive species. Weak relationships from the spectral heterogeneity tests led us to explicitly model plant species richness …
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