Collaborative Research: Late Holocene Expansion of Utah Juniper in Wyoming: A Model System for Studying Ecology of Natural Invasions

合作研究：怀俄明州犹他杜松的全新世晚期扩张：研究自然入侵生态学的模型系统

• 批准号: 9806574
• 负责人: Stephen Jackson
• 金额: $ 23.2万
• 依托单位: University of Wyoming
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-09-15 至 2002-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9806574&HistoricalAwards=false
• 关键词: Collaborative; Research; Late; Holocene; Expansion

9806574Jackson Local and regional expansion of native species due to migration, climate change or land use offer additional opportunities to study patterns and effects of invasion. Ongoing, natural invasions provide model systems to forecast biotic movements and consequences as climate and land use change in the future. This grant will use paleoecological and ecological methods to study the ongoing invasion of Utah juniper (Juniperus osteosperma) in central and eastern Wyoming and adjacent Montana, initiated when Utah juniper crossed the Rocky Mountains and the Continental Divide during the late Holocene. This invasion can be showcased as a model system for addressing central issues about natural invasions because: (1) it is ongoing and has been proceeding for at least 2000 years, long enough to encompass both long and short-distance dispersal events as well as population infilling at older sites; (2) it can be documented at unprecedented spatiotemporal resolution using fossil woodrat-middens, tree-ring based demographic analyses, and both ground and aerial repeat photography; (3) it has the potential to generate important hypotheses as well as provide diverse opportunities to study population dynamics, genetic consequences, and ecosystem effects across a chronosequence of sites representing different stages of invasion, and (4) it underscores the value of historical evidence in reexamining current paradigms about tree invasions in rangelands.

9806574杰克逊本地物种的本地和区域扩张，由于迁移，气候变化或土地利用提供了额外的机会来研究入侵的模式和影响。持续的自然入侵提供了模型系统，以预测未来气候和土地利用变化的生物运动和后果。这项拨款将使用古生态学和生态学方法来研究犹他州杜松（杜松osteosperma）在怀俄明州中部和东部以及邻近的蒙大拿州的持续入侵，当犹他州杜松在全新世晚期穿越落基山脉和大陆分水岭时开始。这种入侵可以作为解决自然入侵核心问题的模型系统来展示，因为：（1）它是持续的，并且已经持续了至少2000年，足够长的时间来包括长距离和短距离的传播事件以及在老地点的人口填充;（2）可以用化石木巢、基于年轮的人口分析以及地面和空中重复摄影以前所未有的时空分辨率记录它;（3）它有可能产生重要的假设，并提供各种机会，研究种群动态，遗传后果，以及在代表不同入侵阶段的地点的时间序列中的生态系统影响，（4）它强调了历史证据在重新审查当前关于牧场树木入侵的范例中的价值。