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作者 Neil, Kaesha
書名 Effects of urbanization on flowering phenology in Phoenix, USA
國際標準書號 9780549862024
book jacket
說明 104 p
附註 Source: Dissertation Abstracts International, Volume: 69-10, Section: B, page: 5886
Thesis (Ph.D.)--Arizona State University, 2008
Phenology has experienced a resurgence of interest in the last few decades because it is a way to understand how global climate change and urbanization affects ecosystem structure and function. Both animals and plants demonstrate changes in phenology and recently, some cases of historically interdependent species (e.g., pollinators and plants) have become less synchronized. The purpose of this study was to determine (1) historical trends in flowering phenology of Sonoran desert plants in urban and non-urban areas, (2) if land cover or water availability causes changes in flowering phenology in brittlebush (Encelia farinosa), and (3) if brittlebush pollinators vary in availability in different land cover types and over time. Moreover, a lesson was developed to teach the interactions of flowering phenology, pollinators, and the environment. Herbarium records from Arizona State University were used to analyze historical flowering trends. Land cover and water availability effect on flowering phenology was tested by placing brittlebush plants in three land cover types with three water treatments and tracking flowering over the spring. Brittlebush pollinators were studied over the same time period in the brittlebush experiment. About 16% of the plants in the herbarium study demonstrated a change in flowering phenology over time (predominately earlier) and about 28% showed a difference in flowering time between Maricopa county and other counties in Arizona. Brittlebush plants in mesiscaped urban sites were found to have bloomed later, longer, and at a higher percentage than brittlebush in desert fringe and desert remnant sites. In addition, there was no difference found in flowering phenology between plants in desert fringe and desert remnant sites. Water treatment had no apparent affect on flowering phenology. Pollinator abundance and richness was lowest in mesiscaped urban sites. Desert remnant sites were lower in abundance, but not richness, than desert fringe sites. Furthermore, only hymenoptera pollinator abundance, but not coleoptera, lepidoptera, or diptera, was significantly higher in desert fringe land cover types than desert remnant and mesiscaped urban sites. In conclusion, the spatiotemporal flowering pattern of Sonoran desert plants was elucidated, with specific attention paid to the brittlebrush flowering cues modified by urbanization and associated pollinators
School code: 0010
Host Item Dissertation Abstracts International 69-10B
主題 Biology, Ecology
Alt Author Arizona State University
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