昆虫蛋的大小和形状随生态而演变,而不是发育速度
Samuel H Church1, Seth Donoughe2,3, Bruno A S de Medeiros2
1Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, USA. church@g.harvard.edu.
Nature
|July 5, 2019
概括
昆虫蛋的大小和形状是独一无二的, 寄生和水生产卵等因素极大地影响了它们的多样化.
科学领域:
- 进化生物学
- 发育生物学
- 生态学
背景情况:
- 生物体大小的多样化是一个关键的进化现象.
- 发育,形态和生态因素是尺寸进化的推测驱动因素.
- 了解昆虫蛋的大小和形状的演变需要整合各种数据集.
研究的目的:
- 研究昆虫蛋的大小和形状的遗传模式.
- 测试发育,形态和生态压力对卵子进化的影响.
- 确定驱动昆虫蛋形态多样化的关键因素.
主要方法:
- 编制了超过一万个昆虫蛋描述的大数据集.
- 综合卵子形态数据与遗传和生命史数据集.
- 进行了遗传学分析来测试进化假设.
主要成果:
- 在8个数量级上观察到昆虫蛋大小和形状之间的显著演变.
- 没有发现卵子大小与发育速度之间的相关性.
- 表明卵子的大小与昆虫的成体大小往往没有相关性.
- 已确定寄生虫和水生卵位是卵子大小和形状多样化的重要驱动因素.
结论:
- 普遍的等量尺度模式不能充分解释昆虫蛋形状的多样性.
- 昆虫蛋的大小和形状的演变主要受到生态因素的影响,特别是卵策略.
- 环境环境,如水生与陆生产卵,是卵形态进化的关键决定因素.
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