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首页> 外文学位 >Oogenesis in endemic Scolytus multistriatus (Marsham) (Coleoptera: Scolytidae) populations and the implications for host selection behavior.
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Oogenesis in endemic Scolytus multistriatus (Marsham) (Coleoptera: Scolytidae) populations and the implications for host selection behavior.

机译：地方性多带墨鱼（Marsham）（鞘翅目：鞘翅目）种群的卵子发生及其对宿主选择行为的影响。

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摘要

Twig-feeding by Scolytus multistriatus is a pre-vitellogenic feeding. Artificial diet studies were used to demonstrate that S. multistriatus females required a pre-vitellogenic feeding on a diet containing protein in order to complete oogenesis. Female S. multistriatus that did not ingest protein failed to complete oogenesis.;The timing of oogenesis during dispersal was determined using live-traps baited with the S. multistriatus aggregation pheromone. Female S. multistriatus responding to the aggregation pheromone in Seattle and Portland exhibited fully developed oocytes and evidence of twig-feeding. Furthermore, a large portion of the females had been mated prior to responding to the aggregation pheromone.;There are two periods in the S. multistriatus life cycle during which the female can engage in pre-vitellogenic feeding; twig-feeding during dispersal and feeding in phloem during egg gallery excavation. The Seattle and Portland populations appeared to use twigs exclusively for pre-vitellogenic feeding. This observation differed from reports on other field populations of S. multistriatus. The hypothesized explanation for the differences was that the Seattle and Portland populations were at endemic levels, while other populations were studied at outbreak levels.;Endemic conditions likely favor individuals that are physiologically and genotypically predisposed to long distance dispersal flights and twig-feeding behavior. Conversely, outbreak conditions likely favor individuals that are responding immediately to pheromone cues and forgoing long distance dispersal. As the dispersal environment shifts between endemic and outbreak conditions, the numbers of individual beetles exhibiting the dispersal behavior favored by the current conditions should increase. This would explain the differing observations between the Seattle/Portland population and other elm bark beetle populations.
机译：Scolytus multistriatus的枝条饲喂是早产卵的。人工饮食研究被用来证明多纹葡萄球菌雌性需要以含卵蛋白饮食来进行卵生前摄食，以完成卵子形成。不摄取蛋白质的雌性多纹葡萄球菌未能完成卵子发生。；使用诱集有多条葡萄球菌聚集信息素的活诱捕器确定散布期间卵子发生的时间。在西雅图和波特兰，对聚集信息素有反应的雌性S. multistriatus表现出完全发育的卵母细胞和取食小树枝的证据。此外，在对聚集信息素作出反应之前，已经有很大一部分雌性交配。；多纹葡萄球菌生命周期中有两个阶段，在此期间雌性可以进行玻璃体前喂养。在散布时喂树枝，在卵廊开挖时喂韧皮。西雅图和波特兰地区的人口似乎只使用树枝来进行早卵。这一观察结果与关于多纹葡萄球菌其他田间种群的报道不同。对于差异的假设解释是，西雅图和波特兰种群处于地方病流行水平，而其他种群则在疾病暴发水平上进行研究;;地方病条件可能偏爱那些生理上和基因型上倾向于长距离分散飞行和细枝觅食行为的个体。相反，暴发条件可能有利于对信息素线索立即做出反应并放弃长距离传播的个体。随着传播环境在地方病和暴发条件之间转移，表现出当前条件有利的传播行为的单个甲虫的数量应增加。这将解释西雅图/波特兰种群与其他榆树皮甲虫种群之间的不同观察结果。

著录项

  • 作者

    White, Bradley Robert.;

  • 作者单位

    University of Washington.;

  • 授予单位 University of Washington.;
  • 学科 Biology Entomology.;Agriculture Forestry and Wildlife.
  • 学位 Ph.D.
  • 年度 1997
  • 页码 163 p.
  • 总页数 163
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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