Dissertation Research: Regulation of Species Diversity by Assembly History in Ecological Communities

论文研究：生态群落中装配史对物种多样性的调节

• 批准号: 0206598
• 负责人: James Drake
• 金额: $ 1万
• 依托单位: University of Tennessee Knoxville
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-06-15 至 2003-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0206598&HistoricalAwards=false
• 关键词: Dissertation; Research; Regulation; Species; Diversity

Spatial scale poses a fundamental problem in understanding species diversity becausemechanisms creating variation in diversity change with scale. Ecological communities arestructured over time as well as patterned across space. Community assembly, how species joincommunities over time, not only poses another problem, but also is responsible for observedspatial patterns. It is not well known how species diversity, community assembly, and spatialscale relate. This project examines three factors that may determine the degree to whichassembly contributes to diversity at different spatial scales. The number of species in theregional species pool, the amount of nutrients available to communities, and the number ofdisturbance types imposed on communities may all play important roles. Hypotheses addressingthese factors will be developed through computer simulations and tested through laboratoryexperiments using bacteria, protists, and rotifers. These approaches, unlike most field studies,ensure rigorous control over invasion sequence and environmental conditions and monitorcommunity dynamics over many generations. Overall, this project will provide an assembly-based model explaining species diversity. Adding temporal dynamics of community assembly toour perspective will enable ecologists to better understand how and when spatial scale is criticalin assessing the regulation of species diversity.

空间尺度是理解物种多样性的一个基本问题，因为多样性变化的机制会随着尺度的变化而变化。生态群落的结构随着时间的推移，以及跨空间的模式。群落组装，即物种如何随着时间的推移加入群落，不仅提出了另一个问题，而且也是造成空间格局的原因。物种多样性、群落聚集度和空间尺度之间的关系尚不清楚。这个项目研究了三个因素，这些因素可能决定了在不同的空间尺度上集合体对多样性的贡献程度。区域物种库中的物种数量、群落可利用的营养物质数量以及群落所受干扰类型的数量都可能起重要作用。假设解决这些因素将通过计算机模拟和实验室实验使用细菌，原生生物和轮虫进行测试。这些方法，不像大多数实地研究，确保严格控制入侵序列和环境条件和monitorcommunitydynamics在许多代。总的来说，这个项目将提供一个组合为基础的模型来解释物种多样性。将群落聚集的时间动态加入到我们的视角中，将使生态学家能够更好地理解空间尺度在评估物种多样性的调节中如何以及何时是关键的。