bYTEBoss Online document search engine; Microsoft Word, Excel, Powerpoint Home Upload Report abuse Contact Search PDF DOC XLS RTF PPT All 3.5 003p.urbanisationkearns Open document | View with Google Docs | Download document | Copyright abuse Content preview The Effects of Urbanization on Pollinator Diversity and Abundance in Boulder Grassland Open Space, Boulder, Colorado, USA.. . Principle Investigator: Carol Ann Kearns Ph.D.. in collaboration with Drs. Diana Oliveras and Betsy Forrest . . Ecologists have called for more data from North America in order to evaluate the extent of pollinator declines and to address the problem. This ongoing study, begun in the summer of 2001, attempts to evaluate the effects of urbanization on the pollinator community in the Boulder area of the Colorado Front Range.. Objectives. The purpose of this study is to evaluate the effects of urbanization on species composition and abundance of pollinators by comparing pollinators in grassland plots near urban areas with those in areas less disturbed by human development. The study focuses on bees and pollinating flies. . Hypothesis. Grassland plots in areas with little urbanization will attract a more diverse assemblage of pollinators and a greater abundance of pollinators than grassland plots near urban areas. More urbanized areas will be dominated by a smaller number of generalist, cosmopolitan species. Grazing will impact flowering species composition which will in turn have an affect on pollinator abundance and diversity.. Methods. Twenty grassland biodiversity plots, characterized as remote or urban, and grazed or ungrazed were sampled. These same plots have been used to study urban edge effects on birds, grasshoppers, rodents and butterflies. Landscape parameters (e.g., vegetation type, area occupied by pavement, buildings, urban parks) were quantified for each plot. Approximately 3600 insects were collected over four summers. For three summers, each plot was sampled repeatedly from May to August and insects visiting flowers were netted during standardized time periods. In 2004, plots were sampled with pan traps. In 2005, urban gardens will be sampled as well.. The species composition of bees will be compared with records in Dr. Theodore Cockerell’s paper “The Bees of Boulder County― published in 1907.. EstimateS (a species estimation program developed by Robert Colwell, University of Connecticut, Connecticut, USA) will be used to estimate total species richness, species richness of urban and remote plots, and species richness of grazed and ungrazed plots. Jaccard’s index of similarity will be calculated for urban and remote plots, and total species richness will be compared to the subset of Cockerell’s (1907) records that can be expected in grassland habitats. General Linear Models analyses will be used for comparisons of the number of species in urban and remote plots, and grazed and ungrazed plots. Canonical correlation analysis will be used to determine what habitat variables are most closely associated with certain species of pollinators. The extent of pavement, buildings and other urban features surrounding each plot will be quantified and used to determine which species are most tolerant of urban conditions.. Preliminary Results. Currently only half of the bees have been identified to species and Diptera identifications are pending. These following results pertain only to the bees collected in 2001 and 2002, the only bees that have been identified to the species level. These preliminary results indicate differences in species composition between urban and remote plots and between grazed and ungrazed plots with significantly lower abundance in grazed plots. Only 54% of the anticipated bee species (based on Cockerell’s 1907 work) have been collected and estimators predict that only 64% of the grassland species that Cockerell collected are still present.. Search Wikipedia for 3.5-003P.urbanisationKearns Search Bing for 3.5-003P.urbanisationKearns Search Google for 3.5-003P.urbanisationKearns Latest files Document.ppt The Café at Café Royal is the first dessert restaurant in London, created by Executive Pastry Chef, Sarah Barber. 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