Habitat Suitability and the Distrbution of Species

栖息地适宜性和物种分布

• 批准号: 0235371
• 负责人: H. Ronald Pulliam
• 金额: $ 38.56万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-01-15 至 2006-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0235371&HistoricalAwards=false
• 关键词: Habitat; Suitability; Distrbution; Species

Plant species characterized by short-distance dispersal (e.g. ant-dispersed species) arehypothesized to be absent from suitable habitat due to dispersal limitation while species characterized by long-distance dispersal (e.g. bird-dispersed species) are often present in unsuitable (sink) habitat due to frequent re-colonization and rescue. These two hypotheses are being tested in a study of the demography and distribution of six forest-understory herb species in a region extending from the lower Piedmont of Georgia to the upper elevations of the Blue Ridge. Among the goals of the study are 1) to develop a rigorous method of delineating suitable habitat by measuring the demographic response of each species to environmental variation, with particular emphasis on responses to soil moisture and light availability, and 2) to use this methodology to test hypotheses about how habitat suitability, demography, and dispersal interact to influence species distributions. In addition to continuing to follow the demography of approximately 15,000 marked individuals, the proposed research will test hypotheses specific to the biology of each of the six study species. The proposed research will help understand and evaluate the impact of climate and land-use change on biological diversity. A detailed knowledge of factors controlling the distribution of the study species will help policy analysts evaluate the potential negative impacts of global change and help resource managers better protect threatened species in times of global change. Graduate and undergraduate students will participate actively in all aspects of the research, gaining experience in experimental design, demographic studies, data management, statistical analysis, and preparation of results for presentations and publication.

以短途分散为特征的植物物种（例如，蚂蚁分散的物种）是由于分散限制而没有适当栖息地所缺乏的，而由于经常重新殖民化和救援，经常出现以长距离分散（例如，鸟类散布物种）的特征（例如，鸟类散布物种）。这两个假设正在研究从佐治亚州下皮埃蒙特到蓝岭的上海拔的一个地区的人口统计学和分布的研究和分布。在研究的目标中，1）通过测量每个物种对环境变化的人口反应来开发一种严格的方法来描述合适的栖息地，尤其强调对土壤水分和光的可用性的响应，以及2）使用这种方法来测试有关栖息地，人口统计学，人口统计学和分散对物种分布的相互作用的假设。除了继续遵循大约15,000个标记个体的人口统计学外，该研究还将检验对六种研究物种中每种生物学特有的假设。拟议的研究将有助于理解和评估气候和土地利用变化对生物多样性的影响。控制研究物种分布的因素的详细知识将有助于政策分析师评估全球变化的潜在负面影响，并帮助资源经理在全球变化时期更好地保护受威胁物种。研究生和本科生将积极参与研究的各个方面，在实验设计，人口统计研究，数据管理，统计分析以及为演示和出版的结果准备方面获得经验。