Dissertation Research: When Does Propagule Limitation Matter? Interactions Between Propogule Supply and Other Constraints on the Distribution of a Native Annual Forb

论文研究：繁殖限制何时重要？

• 批准号: 0508658
• 负责人: Susan Harrison
• 金额: $ 1.2万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-07-01 至 2007-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0508658&HistoricalAwards=false
• 关键词: Dissertation; Research; When; Does; Propagule

Propagule, or seed limitation, is a little-explored factor that may have an important role in determining the distribution of native plant species in invaded grasslands. Distribution of species is classically considered to be controlled by a combination of abiotic factors, such as soil and climate, and biotic factors, such as competitors, predators, and seed bank dynamics. However, seed limitation is an additional constraint to species distributions that is poorly understood. The charismatic native wildflower sky lupine, Lupinus nanus, is an excellent model species because it has several attributes suggestive of seed limitation and it is found in a wide range of grassland habitats. Through large-scale surveys and field experiments in grasslands at the University of California McLaughlin Natural Reserve, we will determine specifically how seed availability interacts with competition and soil properties to delineate the distribution of sky lupine across multiple scales. This work has practical significance for grassland restoration because it will allow us to determine the characteristics of sites in which seed addition can result in recolonization by sky lupine, and potentially a more abundant and diverse native plant community. Given the limited resources available, restoration efforts should be focused on areas that are most likely to result in the establishment of long-term viable populations with minimal investment, areas in which native species absence is primarily a function of seed limitation. From our experiments, methodologies for native plant reinvasion will be developed that take into account interacting mechanisms limiting native plant distribution and pinpoint suitable sites to increase restoration success.

繁殖体，或种子限制，是一个很少被探索的因素，它可能在决定入侵草原上本土植物物种的分布方面发挥重要作用。物种的分布传统上被认为是由非生物因素(如土壤和气候)和生物因素(如竞争对手、捕食者和种子库动态)共同控制的。然而，种子限制是物种分布的一个额外限制，人们对此知之甚少。极具魅力的本土野生花卉天空羽扇豆属Lupinus nanus是一个很好的模式物种，因为它具有几个暗示种子限制的属性，而且它在广泛的草原生境中都能找到。通过在加州大学麦克劳克林自然保护区的草原上进行大规模调查和田间实验，我们将具体确定种子可用性如何与竞争和土壤属性相互作用，以描绘天空羽扇豆属植物在多个尺度上的分布。这项工作对草原恢复具有实际意义，因为它将使我们能够确定种子添加可能导致天空羽扇豆重定植的地点的特征，以及潜在的更丰富和多样化的本土植物群落。鉴于现有资源有限，恢复工作应侧重于最有可能以最少的投资建立长期可生存种群的地区，在这些地区，本地物种的缺乏主要是由于种子限制。从我们的实验中，我们将开发出本土植物再入侵的方法，这些方法将考虑限制本土植物分布的相互作用机制，并准确地确定合适的地点，以提高恢复的成功率。