Regional and Local Diversity in a Patchy Environment: Serpentine Plants in California

加利福尼亚蛇形土壤的露头支持着丰富的特有植物群，其中许多是自然稀有的。这项研究将验证一种假设，即这种特殊植物群的物种多样性是由蛇形岩露头的岛屿性质和其他因素形成的。我将分析整个州蛇形特有植物群的物种多样性模式，同时考虑区域尺度（次县）和局部尺度（50 x 20 m地块）的多样性。区域数据将从已公布的来源收集，并用空间统计进行分析；当地数据将通过分布在全州的24个站点的密集实地采样来收集。通径分析和其他统计技术将被用于确定区域物种多样性、本地物种多样性和环境变量（如生物多样性）之间的关系。土壤化学、气候、地形和蛇纹石的空间分布)。”

ABSTRACTSusan P. HarrisonDEB 0075369Outcrops of serpentine soil in California support a rich flora of endemicspecies, many of which are naturally rare. This study will test thehypothesis that species diversity in this specialized flora is shaped by theisland-like nature of serpentine outcrops, among other factors. I willanalyze patterns of species diversity in the serpentine endemic flora acrossthe entire state, considering diversity at both the regional scale(subcounties) and the local scale (50 x 20 m plots). The regional data willbe gathered from published sources and analyzed with spatial statistics; thelocal data will be gathered by intensive field sampling at 24 sitesdistributed around the state. Path analysis and other statisticaltechniques will be used to determine the relationships between regionalspecies diversity, local species diversity, and environmental variables(e.g. soil chemistry, climate, topography, and the spatial distribution ofserpentine)."