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Extent, Characteristics And Downstream Effects Of Stream Enclosure In Southwestern Ontario, Katie L. Stammler
Extent, Characteristics And Downstream Effects Of Stream Enclosure In Southwestern Ontario, Katie L. Stammler
Electronic Thesis and Dissertation Repository
In a 16000 km2 area of southwestern Ontario, almost 15% of all streams have been enclosed (buried) largely for agricultural purposes. ArcGIS was used to characterize the natural features of catchments and to calculate enclosedness (proportion of stream network enclosed; x̅ = 16.5%, n = 10106). Catchments with the highest enclosedness received >990 mm of precipitation annually and had high drainage density (>1.9 km/km2), while catchments with the lowest enclosedness receivedannually, were characterized by clay and undrumlinized till plains and had relatively shallow water tables (m). These natural features influence where enclosure is likely to occur, …
Identity And Diversity Of Agaricomycetes (Fungi: Basidiomycota) In Temperate Agricultural Soils, Barbara D. Bahnmann
Identity And Diversity Of Agaricomycetes (Fungi: Basidiomycota) In Temperate Agricultural Soils, Barbara D. Bahnmann
Digitized Theses
The objectives of this study were to identify and to compare the species richness, community composition and genetic diversity of Agaricomycetes in Michigan agricultural soils. Ribosomal DNA sequences were obtained from soils in four treatments: conventional till monocrop, no-till monocrop, historically tilled grassland and never-tilled grassland. The Agaricales dominated the community, with 85 % of all detected taxa. The taxonomic composition of conventional till plots was different from other plots due to the high prevalence of Pneumatospora (Cantharellales) and Lachnella/Calathella (Agaricales) clades and the absence of Hygrocybe (Agaricales) and Polyporales clades. These latter clades dominated less disturbed treatments. Genetic diversity …