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首页> 外文学位 >Non-native plant species in mountainous areas: A case study of Linaria dalmatica in the Greater Yellowstone Ecosystem.
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Non-native plant species in mountainous areas: A case study of Linaria dalmatica in the Greater Yellowstone Ecosystem.

机译：山区非本地植物物种：以大黄石生态系统中的Linaria dalmatica为例。

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摘要

Non-native plant species are increasingly being viewed as a threat to sub-alpine and alpine ecosystems, and the need to determine the causes and mechanisms of non-native plant invasions in mountain systems has been recognized. This study was initiated to provide: (1) useful information for managers in the local area and, (2) information that can be used in concert with data from similar studies to help elucidate the causes and mechanisms of non-native plant species invasions in mountain systems at the global scale. Eighteen populations a non-native species (Linaria dalmatica) and 14 populations of a closely related native species (Castilleja miniata) were surveyed along an elevation gradient in the Greater Yellowstone Ecosystem. Climate, environmental, and species demographic data were collected from each site from 2008--2011. Climate and environmental predictors varied along the elevation gradient, with stem density of the two test species being explained by different sets of predictors. Vital rates of L. dalmatica were found to be more variable and more highly associated with climate and environmental predictor variables than those of C. miniata. The population growth rate of L. dalmatica did not show any consistent trend with elevation, but did appear to be influenced by extremely cold temperatures and predictors related to the vegetative community. Probability of occurrence of L. dalmatica was related to elevation. Percent cover of L. dalmatica was not associated with elevation, instead being strongly associated with vegetative community characteristics such as percent perennial cover. The current range of L. dalmatica was broader than the majority of native species in the study area, and the non-native plant community in the study area was significantly more nested with increased elevation than the native plant community. These results suggest that L. dalmatica is a broadly adapted species. Overall, our data fail to provide conclusive evidence of climatic limits for this species, but suggest that it may be limited from upward expansion by extremely cold winter temperatures. Until conclusive evidence of climatic limitation is provided, the upper populations of this species should be monitored and managed to prevent further spread into sub-alpine/alpine environments.
机译：越来越多地将非本地植物物种视为对亚高山和高山生态系统的威胁，并且认识到需要确定山区系统中非本地植物入侵的原因和机制。开始这项研究的目的是：（1）为当地的管理者提供有用的信息，以及（2）可以与类似研究的数据一起使用的信息，以帮助阐明非洲非本地植物物种入侵的原因和机制。全球范围内的山区系统。在大黄石生态系统中，沿海拔梯度调查了18个非本地物种（大叶利纳里亚）和14个密切相关的本地物种（Castilleja miniata）。从2008--2011年从每个站点收集了气候，环境和物种人口统计数据。气候和环境预测因子沿海拔梯度变化，两种测试物种的茎密度由不同的预测因子集解释。与小杯角藻相比，达美乳杆菌的生命率变化更大，与气候和环境预测变量的相关性更高。达玛.L。dalmatica的人口增长率没有显示出与海拔高度一致的趋势，但似乎受极端低温和与植物群落有关的预测因素的影响。 dalmatica发生的可能性与海拔高度有关。 L. dalmatica的覆盖率与海拔无关，而是与植物群落特征（如多年生覆盖率）密切相关。目前，达玛乳杆菌的范围比研究区域中的大多数本地物种都广，研究区域中的非本地植物群落比本地植物群落更明显地嵌套在海拔升高的地方。这些结果表明，达摩乳杆菌是广泛适应的物种。总体而言，我们的数据未能提供该物种气候极限的确凿证据，但表明，极寒的冬季温度可能会限制其向上扩展。在提供确凿的气候限制证据之前，应对该物种的高种群进行监测和管理，以防止其进一步扩散到亚高山/高山环境中。

著录项

  • 作者

    Pollnac, Fredric Winslow.;

  • 作者单位

    Montana State University.;

  • 授予单位 Montana State University.;
  • 学科 Botany.;Environmental management.;Ecology.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 274 p.
  • 总页数 274
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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