EAGER: Determining the role of priority effects within dominant species to govern intra-specific variation and diversity

这项研究将扩展当前研究的一个重要领域，该领域探索了生态群落在火灾、洪水或干旱等干扰事件后如何重新聚集。最近的研究表明，不同物种到达一个地区的顺序往往对由此产生的生态群落的组成和功能有很大影响，早到的人比晚到的人更有优势。这被称为优先效应。这项研究将使用美国大平原南部的植物种群，将这一想法扩展到物种之间的相互作用之外，观察同一物种个体之间相互作用的优先效应是否会在多样性及其在生态系统中的功能方面塑造种群。研究人员将研究六种不同的草种，将大平原原生的草种与入侵的非原生草种进行比较。这种比较将加强我们对物种多样性是如何产生并影响群落其他部分的理解，并可能帮助我们管理这一重要的栖息地。此外，这项研究的结果将是在更广泛的影响方面向前迈出的重要一步，包括可持续农业中生态强化努力的新方法。该项目还将为高中生、本科生和研究生提供研究培训，包括妇女和来自代表性不足的少数群体的学生。了解种内多样性对生态系统的功能和服务，包括水和碳的循环的重要性，是一项新的工作。这项研究项目将调查群落组装过程中资源竞争所驱动的优先效应推广到种内相互作用的背景下，以确定在大平原南部常见的三种本地植物和三种外来植物的种内生物多样性和生态系统功能。尖端植物基因分型将通过量化地上和地下的功能和生理特性与植物表型相联系，以描述地点内和地点之间遗传和表型多样性的关联模式。这些数据将为温室中胚层实验的建设提供信息，这些实验将被用来检验关于不同类型地点之间以及本地和非本地物种之间优先效应的相对重要性的假设。后一项实验将阐明在种群组织过程中植物基因型到达顺序的结果最终如何塑造生态系统的功能。

This research will extend an important area of current research that has explored how ecological communities re-assemble after disturbance events like fires, floods or droughts. Recent studies have shown that the order in which different species arrive to an area often has a big influence on the makeup and function of the resulting ecological community, with early arrivers having an advantage over late arrivers. This is referred to as a priority effect. This research will use plant populations in the Southern Great Plains to extend this idea beyond interactions among species, looking at whether priority effects in the interactions among individuals of the same species shape populations in terms of the diversity and their functions in the ecosystem. Researchers will study six different grass species, allowing comparison of species that are native to the Great Plains to some that are invading non-natives. This comparison will strengthen our understanding of how diversity within species comes about and influences the rest of the community, and may help us manage this important habitat. In addition, findings from this study will be a major step forward into broader implications including novel approaches to ecological intensification efforts in sustainable agriculture. The project also will provide research training for high school, undergraduate and graduate students, including women and students from underrepresented minority groups.Understanding the significance of intra-specific diversity for the functioning and services of ecosystems, including the cycling of water and carbon, is novel. The research project will investigate the generalization of priority effects driven by resource competition during community assembly to the context of intra-specific interactions, in order to determine intra-specific biodiversity and ecosystem function in three native and three exotic plant species commonly found in the Southern Great Plains. Cutting-edge plant genotyping will be linked with plant phenotyping via quantification of above- and belowground functional and physiological traits, to describe the patterns of association of genetic and phenotypic diversity within and across sites. These data will inform the construction of greenhouse mesocosm experiments which will be used to test hypotheses regarding the relative importance of priority effects among types of sites and between native and non-native species. The latter experiments will shed light on how the outcomes of plant genotype arrival order during population organization ultimately shapes the functioning of ecosystems.