Multi-scale Analysis of the Biogeography, Ecology, and Genetic Structure of Sand Pine in Florida

佛罗里达州沙松生物地理学、生态学和遗传结构的多尺度分析

• 批准号: 9313704
• 负责人: Kathleen Parker
• 金额: $ 17.5万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-01-15 至 1997-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9313704&HistoricalAwards=false
• 关键词: Multi; scale; Analysis; Biogeography; Ecology

9313704 PARKER Many biogeographers, ecologists, population biologists, and other scientists have recognized that scale is an important factor to be considered in their research. Hierarchy theory has highlighted the need to evaluate the broader spatial scales inherent in regional environmental histories as a context within which ecological and genetic interactions occur at finer scales of resolution. In order to identify how regional processes of disturbance and regeneration relate to spatial patterns, age structures, and genetic composition of related species, this project will examine two types of sand pine (Pinus clausa) in Florida. Ocala sand pine occurs in peninsular Florida, while Choctawhatchee sand pine is present in the Florida panhandle. Both species exist in both coastal and inland locations, where they occupy similar environments, but their stands are separated by more than 100 km. The project will be conducted in two phases. The first will consist of collection of materials and data on the diameter and tree-ring structure of sample trees as well as soil, foliage, and other environmental data for 18 representative sites. This information will be evaluated through detailed allozyme analyses to determine genetic and ecological variations between Ocala and Choctawhatchee sand pine. During a second phase of research, the demographic and genetic structure of four or five representative stands will be mapped in detail. This mapping will permit assessment of the ways that environmental and disturbance histories have affected each kind of sand pine. Of particular concern to the experienced team of geographers and population biologists undertaking this project is degree to which the dispersion of different trees are related to differences in the scales of disturbance (such as localized canopy fires vs. wide-spread wind damage from hurricanes). Attention also focuses on the extent to which these differences are related to finer-scale variations in g enetic structures within populations. This focused case study of variations among two species of Florida sand pine will provide valuable tests of hypotheses related to a broader range of topics. In addition to providing new insights regarding the possible impacts of Quaternary sea- level change on the isolation and genetic differentiation of species, the results of this research will shed light on multi- scale relationships among site characteristics, disturbance ecology, and the genetic structure of vegetation. ***

9313704帕克许多生物地理学家、生态学家、种群生物学家和其他科学家都认识到，规模是他们研究中要考虑的一个重要因素。等级理论强调，有必要评估区域环境历史中固有的更广泛的空间尺度，将其作为生态和遗传相互作用在更精细的分辨率尺度上发生的背景。为了确定区域干扰和更新过程如何与相关物种的空间格局、年龄结构和遗传组成相关，该项目将研究佛罗里达州的两种沙松(黄皮松)。奥卡拉沙松生长在佛罗里达半岛，而乔克塔奇沙松生长在佛罗里达狭长地带。这两个物种都生活在沿海和内陆地区，它们所处的环境相似，但它们的立场相隔100多公里。该项目将分两个阶段进行。第一个将包括收集材料和数据，关于样本树木的直径和树轮结构，以及18个代表性地点的土壤、树叶和其他环境数据。这些信息将通过详细的等位酶分析进行评估，以确定Ocala和ChoctaWhatchee沙松之间的遗传和生态差异。在第二阶段的研究中，将详细绘制四到五个具有代表性的林分的人口统计和遗传结构图。这份地图将允许评估环境和干扰历史对每种沙松的影响方式。从事这一项目的经验丰富的地理学家和种群生物学家团队特别关注的是，不同树木的分散程度与干扰规模的差异(如局部树冠火灾和飓风造成的大范围风灾)有关。人们还关注这些差异在多大程度上与种群内遗传结构的更细微规模的差异有关。这项关于佛罗里达沙松两种树种之间差异的重点案例研究将为与更广泛的主题相关的假设提供有价值的测试。除了对第四纪海平面变化对物种隔离和遗传分化的可能影响提供新的见解外，这项研究的结果还将揭示立地特征、干扰生态和植被遗传结构之间的多尺度关系。***