• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Habitat selection by mountain pine beetles (Dendroctonus ponderosae) in dynamic environments.
【24h】

Habitat selection by mountain pine beetles (Dendroctonus ponderosae) in dynamic environments.

机译：在动态环境中按山地松甲虫（Dendroctonus tankerosae）选择栖息地。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Most organisms must survive and reproduce in environments that are spatially and temporally variable. Due to this variability the behaviour that optimizes an individual's fitness in one environment may be suboptimal in other environments. Here I examine habitat selection by mountain pine beetles (Dendroctonus ponderosae) and test how beetles modify their behaviour in response to shifts in habitat quality and availability. In particular, I focus on environmental changes that are due to density-dependent processes (competition, conspecific cueing).; Habitat selection behaviour often necessitates a trade-off between the benefits of locating high quality habitat and the costs associated with being selective and searching for the habitat. The costs of searching for good quality habitat may include energetic costs, mortality risks, and lost opportunities. I determined that mountain pine beetles face a trade-off between allocating energy to dispersal or reproduction; beetles that begin reproduction with low energy reserves have a decreased reproductive investment. Using simulation models I also demonstrated that when competition for habitat is high, the cost of being selective increases because habitat quality decreases quickly throughout time.; If the costs associated with searching for habitat are environmentally dependent, habitat acceptance behaviour may vary with environmental conditions. Using a combination of computer models and field experiments, I found that beetles modified their behaviour in response to density-influenced shifts in habitat quality both within a season, and across populations that differed in density. At low population densities the cost of being selective is determined primarily by the risk of not locating suitable habitat that is rare in the environment. Conversely, at high population densities intraspecific competition and a decrease in the reliability of cues that indicate habitat quality favour beetles to be less selective when searching for habitat. Changes in tree abundance and quality, such as due to fire damage, were generally less important than population factors in altering habitat selection behaviour. My findings indicate beetles' habitat acceptance behaviour is condition-dependent, and that beetles' optimal behaviour depends on both habitat availability and the dynamics of how habitat is settled.
机译：大多数生物必须在时空变化的环境中生存和繁殖。由于这种可变性，在一个环境中优化个体适应性的行为在其他环境中可能不是最佳的。在这里，我研究了按山松甲虫（Dendroctonus tankerosae）选择栖息地的方法，并测试了甲虫如何根据栖息地质量和可用性的变化来改变其行为。我特别关注由于密度依赖性过程（竞争，特定提示）引起的环境变化。栖息地的选择行为通常需要在定位高质量栖息地的好处与选择和寻找栖息地相关的成本之间进行权衡。寻找优质栖息地的成本可能包括能源成本，死亡风险和失去的机会。我确定山松甲虫在分配能量以分散或繁殖之间要权衡；以低能量储备开始繁殖的甲虫的繁殖投资减少。使用模拟模型，我还证明了当争夺生境的竞争激烈时，由于生境质量随时间而迅速下降，因此进行选择的成本会增加。如果与寻找栖息地相关的成本与环境有关，则栖息地的接受行为可能会随环境条件而变化。结合计算机模型和田间试验，我发现甲虫在一个季节内以及在密度不同的种群之间，都响应于栖息地质量受到密度影响而改变了它们的行为。在人口密度低的情况下，选择性的成本主要取决于无法找到环境中罕见的合适栖息地的风险。相反，在高种群密度下，种内竞争和指示栖息地质量的线索的可靠性下降，有利于甲虫在寻找栖息地时选择性较低。在改变生境选择行为方面，树木丰度和质量的变化（例如由于火灾造成的变化）通常不如人口因素重要。我的发现表明，甲虫的栖息地接受行为是与条件有关的，并且甲虫的最佳行为取决于栖息地的可利用性和栖息地的沉积动力学。

著录项

  • 作者

    Elkin, Che Miguel.;

  • 作者单位

    University of Calgary (Canada).;

  • 授予单位 University of Calgary (Canada).;
  • 学科 Biology Ecology.; Biology Entomology.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 234 p.
  • 总页数 234
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生态学（生物生态学）;昆虫学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号