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首页> 外文学位 >Factors affecting defoliation of eastern hemlock ( Tsuga canadensis) by the pale-winged gray moth (Iridopsis ephyraria).
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Factors affecting defoliation of eastern hemlock ( Tsuga canadensis) by the pale-winged gray moth (Iridopsis ephyraria).

机译：苍翅灰蛾（Iridopsis ephyraria）影响东铁杉（加拿大铁杉）落叶的因素。

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摘要

The main objective of this thesis was to study the possible factors that could explain the feeding preference of the pale-winged gray moth (PWG) (Iridopsis ephyraria) for the mid-lower crown of eastern hemlocks in south-west Nova Scotia. I first described egg and larval distribution between crown locations of mature hemlocks. I then focused on testing two hypotheses that could explain the pale-winged gray feeding preference for the foliage located in the mid-lower crown: (1) hygrothermal and (2) foliage quality hypotheses.;My research shows that eggs and larvae were principally located in the mid-lower crown. This larval preference could partly explain the greatest defoliation in the mid-lower crown of mature hemlocks. Experimental and observational data revealed that both hygrothermal stress and foliage quality varied between crown locations and thus affected the PWG feeding preference. The disadvantages of heat and water stress in the upper crown, however, outweighed the benefits to feed on higher foliage quality which explains the PWG feeding preference for foliage in the mid-lower crown. Additional data on foliage age showed that larvae prefer to feed on current-year foliage presumably because this age-class had higher water and nitrogen content. This feeding preference may have helped larvae to survive in the upper crown where temperatures are warmer.;This research adds to the literature on plant-insect interactions, allows a better understanding of the pale-winged gray moth natural history but mostly, informs us on the factors that affect PWG survival.
机译：本论文的主要目的是研究可能的因素，这些因素可以解释苍蝇灰蛾（Iridopsis ephyraria）对西南新斯科舍省东部铁杉中下冠的摄食偏好。我首先描述了成熟铁杉冠位之间的卵和幼虫分布。然后，我重点研究了两个假设，这些假设可以解释位于树冠中下部的树叶的灰翅灰色取食偏好：（1）湿热和（2）树叶质量假设。；我的研究表明，卵和幼虫主要是卵位于中下部表冠。这种幼虫的偏爱可以部分解释成熟铁杉中下部冠的最大落叶。实验和观察数据表明，湿热胁迫和枝叶质量在树冠位置之间变化，因此影响了PWG的饲喂偏好。然而，上部树冠的热量和水分胁迫的弊端超过了以较高的叶子质量为食的好处，这解释了PWG对下部中冠的叶子的偏好。有关叶龄的其他数据显示，大概是由于该年龄层的水和氮含量较高，因此幼虫更喜欢以当年的叶为食。这种摄食偏好可能帮助幼虫在温度较高的上冠中存活。;本研究增加了植物-昆虫相互作用的文献，使人们能够更好地了解苍翅灰蛾的自然历史，但主要是在影响PWG生存的因素。

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  • 作者

    Hervieux, Meggy.;

  • 作者单位

    McGill University (Canada).;

  • 授予单位 McGill University (Canada).;
  • 学科 Biology Entomology.;Agriculture Forestry and Wildlife.;Biology Ecology.
  • 学位 M.Sc.
  • 年度 2012
  • 页码 83 p.
  • 总页数 83
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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