Does Development Bias the Evolution of Beetle Horns?

甲虫角的进化是否受到发育的影响?

基本信息

  • 批准号:
    9807932
  • 负责人:
  • 金额:
    $ 25万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    1998
  • 资助国家:
    美国
  • 起止时间:
    1998-08-01 至 2001-07-31
  • 项目状态:
    已结题

项目摘要

Emlen 9807932 Many beetle species have "horns" which are only produced by males. These horns can be extreme (as dramatic as the antlers of elk), and investment by males into the production of horns is presumed to be substantial. In many beetle species only some of the males produce horns. other males being completely homless. In most species of the genus Onthophagus (Coleoptera: Scarabaeidae), male horn expression is facultative, and depends on whether or not a male grows larger than a threshold body size: males growing larger than this size produce horns, whereas males not attaining this size do not. Facultative expression of male horns provides an unusual opportunity to study how horns develop, and whether horns are "costly" to males to produce. Prior research revealed that males allocating developmental resources to horn production were forced to compensate by reducing allocation to other traits, including eyes. This suggests that there may be allocation tradeoffs operating during beetle development which restrict the range of beetle shapes that can be produced, and these may also restrict the directions of evolution within the genus. Here the PI extends his prior work by (1) using manipulative experiments on developing larvae to confirm the existence and nature of resource allocation tradeoffs, and (2) testing whether the biases predicted to arise from such a mechanism are manifest in the shape variation among taxa. This study will enhance our understanding of the relationship between developmental mechanisms and evolutionary change, as well as improve our understanding of the "costs" associated with the production of exaggerated secondary sexual characters like beetle horns.
埃姆伦9807932 许多种类的甲虫都有只由雄性产生的“角”。这些角可以是极端的(如麋鹿的鹿角),雄性对角的生产投资被认为是巨大的。在许多种类的甲虫中,只有部分雄性长角。其他雄性则无家可归在Onthophagus属(鞘翅目:金龟子科)的大多数物种中,雄性角的表达是兼性的,并且取决于雄性是否长得比阈值身体尺寸大:雄性长得比这个尺寸大会产生角,而雄性没有达到这个尺寸不会。 雄性角的兼性表达提供了一个不寻常的机会来研究角如何发育,以及雄性产生角是否“昂贵”。先前的研究表明,男性分配发展资源的角生产被迫补偿减少分配给其他特征,包括眼睛。这表明,可能有分配权衡操作过程中甲虫的发展,限制了范围内的甲虫形状,可以生产,这些也可能限制属内的进化方向。在这里,PI扩展了他以前的工作,(1)使用发育幼虫的操纵实验来确认资源分配权衡的存在和性质,以及(2)测试预测从这种机制产生的偏差是否表现在分类群之间的形状变化中。这项研究将增强我们对发育机制和进化变化之间关系的理解,并提高我们对与产生夸张的第二性征(如甲虫角)相关的“成本”的理解。

项目成果

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Douglas Emlen其他文献

Douglas Emlen的其他文献

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{{ truncateString('Douglas Emlen', 18)}}的其他基金

COLLABORATIVE RESEARCH: Multimodal Signaling in Rhinoceros Beetles
合作研究:犀牛甲虫的多模式信号传导
  • 批准号:
    2015907
  • 财政年份:
    2020
  • 资助金额:
    $ 25万
  • 项目类别:
    Continuing Grant
Collaborative Research: The Evolution of Extreme Trait Size
合作研究:极端特征尺寸的演变
  • 批准号:
    1456133
  • 财政年份:
    2015
  • 资助金额:
    $ 25万
  • 项目类别:
    Continuing Grant
DISSERTATION RESEARCH: Animal weapon diversity: Insights from the form and function of rhinoceros beetle horns
论文研究:动物武器多样性:犀牛甲虫角的形式和功能的见解
  • 批准号:
    1310235
  • 财政年份:
    2013
  • 资助金额:
    $ 25万
  • 项目类别:
    Standard Grant
Collaborative Research: Genetic mechanisms of conditional-expression and trait exaggeration in weapons of sexual selection
合作研究:性选择武器中条件表达和性状夸大的遗传机制
  • 批准号:
    0919781
  • 财政年份:
    2009
  • 资助金额:
    $ 25万
  • 项目类别:
    Continuing Grant
Collaborative Research: Insulin and Limb-Patterning Pathway Activities in the Horns of Beetles: An Integrative Study of the Mechanisms of Allometry, Dimorphism, Branching & Cur
合作研究:甲虫角中的胰岛素和肢体模式通路活动:异速生长、二态性、分支机制的综合研究
  • 批准号:
    0642409
  • 财政年份:
    2007
  • 资助金额:
    $ 25万
  • 项目类别:
    Continuing Grant
Dissertation Research: Interactions Between Primary and Secondary Sexual Characters in the Tortoise Beetle Acromis sparsa
论文研究: 龟甲虫 Acromis sparsa 主要和次要性特征之间的相互作用
  • 批准号:
    0508906
  • 财政年份:
    2005
  • 资助金额:
    $ 25万
  • 项目类别:
    Standard Grant
DISSERTATION RESEARCH: Linking Development with Evolution: Morphological and Ecological Consequences Associated with Walking Stick Limb Regeneration
论文研究:将发育与进化联系起来:与手杖肢体再生相关的形态和生态后果
  • 批准号:
    0309038
  • 财政年份:
    2003
  • 资助金额:
    $ 25万
  • 项目类别:
    Standard Grant
PECASE: Development and Evolution of Exaggerated Morphologies in Insects: An Integrated Study of Beetles with Horns
PECASE:昆虫夸张形态的发展和进化:有角甲虫的综合研究
  • 批准号:
    0092873
  • 财政年份:
    2001
  • 资助金额:
    $ 25万
  • 项目类别:
    Continuing Grant
Symposium: Insects as Models for Integrating Development with Evolution
研讨会:昆虫作为发育与进化相结合的模型
  • 批准号:
    0078320
  • 财政年份:
    2000
  • 资助金额:
    $ 25万
  • 项目类别:
    Standard Grant
Does Development Bias Evolution?
发展偏见会进化吗?
  • 批准号:
    9723637
  • 财政年份:
    1997
  • 资助金额:
    $ 25万
  • 项目类别:
    Standard Grant

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