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相关概念视频

What is a Species?01:17

What is a Species?

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Formation of Species01:31

Formation of Species

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Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.
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Speciation Rates01:07

Speciation Rates

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Frequency-dependent Selection01:21

Frequency-dependent Selection

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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Genetics of Speciation02:16

Genetics of Speciation

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Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
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Gene Flow02:39

Gene Flow

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Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
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相关实验视频

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Field Experiments of Pollination Ecology: The Case of Lycoris sanguinea var. sanguinea
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宿主植物的适应驱动着生殖隔离的并行进化.

Patrik Nosil1, Bernard J Crespi, Cristina P Sandoval

  • 1Department of Biosciences, Behavioural Ecology Research Group, Simon Fraser University, Burnaby BC, Canada, V5A 1S6. pnosila@sfu.ca

Nature
|May 25, 2002
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概括
此摘要是机器生成的。

自然选择驱动并行物种化,在这种情况下,适应不同的环境反复导致繁殖隔离. 这项研究表明,行走棒昆虫的宿主植物适应促进了性隔离,证明了自然选择.

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科学领域:

  • 进化生物学 进化生物学
  • 规范研究研究 规范研究
  • 生态生态学 生态生态学

背景情况:

  • 平行进化,即类似的特征独立出现,表明了自然选择的作用.
  • 并行物种化涉及繁殖隔离的重复进化,作为适应的副产品.
  • 在生态上不同的种群往往比相似的种群表现出更大的生殖隔离.

研究的目的:

  • 研究自然选择与平行物种化中的遗传漂移之间的作用.
  • 为了提供自然界平行物种化的确例子.
  • 为了证明宿主植物适应在早期物种化中的可重复作用.

主要方法:

  • 研究了散步棒昆虫 (Timema cristinae) 种群,使用不同的宿主植物.
  • 分析了身体大小,形状,宿主偏好,行为和颜色形态频率的分歧.
  • 评估了宿主植物适应性隔离的贡献.

主要成果:

  • 对于宿主适应的不同选择,而不是遗传漂移,推动了性隔离的并行进化.
  • 使用不同宿主植物的种群在多个特征中显示出显著的分歧.
  • 这代表了一个明确的,可重复的宿主植物适应促进物种化的实例.

结论:

  • 宿主植物的适应是物种化的早期阶段的关键和可重复的因素.
  • 自然选择,特别是宿主适应的分离选择,是并行物种化的主要驱动因素.
  • 这些发现提供了强有力的证据,证明自然选择在繁殖隔离的反复进化中的作用.