DISSERTATION RESEARCH: The influence of plant-plant interactions on pollination and plant reproduction near poleward range margins

论文研究：植物间相互作用对极地范围边缘附近授粉和植物繁殖的影响

• 批准号: 1601526
• 负责人: Rebecca Irwin
• 金额: $ 1.74万
• 依托单位: Dartmouth College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-07-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1601526&HistoricalAwards=false
• 关键词: DISSERTATION; RESEARCH; influence; plant; interactions

Climate change may alleviate stressful environmental conditions, such as cold temperatures and a shorter growing season, that directly hinder flowering plants in northern regions. In addition, climate change may alter interactions between plants and other organisms. Will competition with neighbors affect whether plants respond to increasing temperatures? Observations and experiments on shrubs and pollinators at different distances from a glacier will answer this question. The scientific workforce will be strengthened through support for the education and training of a doctoral student and participation of undergraduates. Science communication will be enhanced through citizen scientist participation and outreach to middle-school and high-school students. The stress-gradient hypothesis, which posits that plant-plant interactions transition from being competitive to facilitative with increasing stress, will be extended to include pollinator networks. The low-shrub tundra of Kangerlussuaq, Greenland, which is near the poleward range edge of many plants, including our focal species, Vaccinium uliginosum (Ericaceae) encompasses a gradient of 3 degrees C, which mirrors the expected temperature increase in West Greenland over the next 70 years. Using a vegetation removal experiment, how co-occurring plants affect the reproduction of Vaccinium will be determined. Plant traits associated with pollinator attraction and pollinator visitation will be observed, and pollen supplementation treatments will assess pollen limitation. Fruit set and seed production will be measured to assess pollinator-mediated mechanisms in the stress gradient hypothesis. The outcome will improve understanding of the processes of increasing shrub cover in Arctic tundra.

气候变化可能会缓解不利的环境条件，例如寒冷的气温和较短的生长季节，这些条件直接阻碍了北部地区的开花植物。此外，气候变化可能会改变植物和其他生物之间的相互作用。 与邻居的竞争会影响植物对气温升高的反应吗？ 对距冰川不同距离的灌木和传粉者的观察和实验将回答这个问题。 将通过支持博士生的教育和培训以及本科生的参与来加强科学队伍。通过公民科学家的参与以及对中学生和高中生的宣传，将加强科学传播。胁迫梯度假说认为，随着胁迫的增加，植物与植物之间的相互作用从竞争性转变为促进性，该假说将扩展到包括传粉媒介网络。格陵兰康克鲁斯瓦克的低灌木苔原靠近许多植物的极地范围边缘，包括我们的重点物种越橘（杜鹃花科），其梯度为 3 摄氏度，这反映了格陵兰岛西部预计的气温升高。下一个70年。通过植被去除实验，将确定共生植物如何影响越橘的繁殖。 将观察与传粉媒介吸引和传粉媒介访问相关的植物性状，并且花粉补充处理将评估花粉限制。 将测量坐果和种子产量，以评估胁迫梯度假设中传粉媒介介导的机制。 研究结果将增进对北极苔原灌木覆盖增加过程的了解。