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 704 for “"species richness"”.
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Species richness in reed marshes
Contains fulltext : 146655.pdf (Publisher’s version ) (Open Access)
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Species richness and metacommunity dynamics in bryophytes
Bryophyte species richness and composition were analysed on limestone boulder habitats across twenty sites in Malta. These boulders acted as standard units for studying the effect of environmental, microtopographical and spatial factors on bryophyte metacommunities. The results indicated that …
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Enhancement of Floral Species Richness in Glaciated Prairie Temporary Wetlands
… Pothole Region wetlands frequently recover plant species richness resembling undisturbed conditions. However, plant species richness in temporarily flooded wetlands often recovers poorly due to colonization by aggressive undesirable species. This study was conducted during 1995 and 1996 in eastern …
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Species richness and composition of avifaunal communities in a complex Amazonian landscape
… Amazonia. This study aimed to identify how species richness and composition of avifaunal communities in the lower Rio Purús region of central Amazonia compare across terra firme, whitewater and blackwater seasonally flooded forests and their seasonal variation in water levels. Avifauna was …
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Vascular Plant and Vertebrate Species Richness in National Parks of the Eastern United States
Given the estimates that species diversity is diminishing at 50-100 times the normal rate, it is critical that we be able to evaluate changes in species richness in order to make informed decisions for conserving species diversity. To contribute to the ongoing analysis of species richness …
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The Effect of Spatial and Environmental Drivers on Patterns in Species Richness and Composition
… that aim to enhance the understanding of species richness and composition patterns and their underlying drivers. Islands and isolated systems are in the focus of this work. Islands provide optimal conditions to study biogeographic patterns. Theoretical advances in ecology have been …
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How land use influences wildlife occupancy and species richness in the City of Cape Town
… that only a few, mostly medium sized generalist species, persist. What is not known is what native mammal species, if any, are living in unprotected green belts and parks in suburban and urban areas of the city. In this study I follow the approach of the Urban Wildlife Information Network by …
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Influence of Habitat Characteristics on Wetland Bird Abundance and Species Richness at Ordway Prairie, South Dakota
… of glacial wetlands that influence abundance and species richness of wetland birds. Four bird surveys were conducted annually from mid-May through mid-August. Fourteen habitat variables were used to describe five wetland characteristics including wetland classification, emergent cover, submergent …
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Artificial Night Lighting and Anthropogenic Noise Alter Animal Activity, Body Condition, Species Richness, and Community Structure
… changes, physiological responses, changes in species interactions, and altered community structure. Increased levels of light and noise pollution can originate from many sources including roads, energy development and infrastructure, and urbanization. Even remote or protected areas are not …
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Sampling adequacy of freshwater mussel surveys and variation of mussel species richness in Illinois wadeable streams
… and tested. Furthermore, the percentage of all species captured with a standard sampling effort (e.g., search of man-hours) may vary greatly among sites, introducing biases into our understanding of species-diversity patterns and temporal trends. In addressing both questions, I focused on …
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Evaluation of sampling methodologies for assessing fish species richness in ridge and valley streams in Chattanooga, Tennessee
… electrofishing approaches for estimating species richness in small Ridge and Valley streams. My study objectives were to determine the effects of the sampling season, reach length, habitat sequences surveyed, and sampling intensity on estimates of fish species richness. Fish assemblages …
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An assessment of a herpetofaunal community in Hamilton, County, Tennessee: baseline ecology, species richness, and relative abundance
… I report on a 32-month study investigating species richness, abundance, sex ratios, and body sizes of amphibians and reptiles in a Hamilton County, Tennessee, wetland. Utilizing drift fencing in conjunction with pitfall arrays, a total of 14 reptile species and 16 amphibian species was …
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Species Richness and Ecological Diversity of Myxomycetes and Myxomycete-Like Organisms in the Tropical Forests of Brazil
… regarding the heterogeneity of microorganism species that compose the Brazilian microbiota increases slowly. Therefore, urgent efforts should be directed to the carrying out of inventories and studies on the species that make up the Brazilian microbiota, their biogeographical patterns, and …
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Patterns of plant species richness and diversity across two habitat types in the Upper Karoo, South Africa
… and climatic variables as drivers of species richness, relative cover, and growth form diversity in two habitat types (i.e. plains and rocky dolerite hillslopes), and along a longitudinal environmental gradient. A pairwise floristic survey approach was implemented, using modified …
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The relative importance of natural and human-induced environmental conditions for species richness distribution patterns in South Africa
… the spatial distribution of South African avian species richness from the viewpoint that humans are a substantial modifying force on earth, and have also modified the historical spatial distribution of species richness. The main aim of the thesis is to investigate the way in which humans have …
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Small Mammal Species Richness And Relative Abundance Across The Elevational Gradient And Microhabitats Of Pine Mountain, Eastern Kentucky
… 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 Pine …
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