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在Heliconius蝶中通过杂交的物种化
Jesús Mavárez1, Camilo A Salazar, Eldredge Bermingham
1Smithsonian Tropical Research Institute, Apartado postal 0843-03092, Panamá, República de Panamá. mavarezj@si.edu
Nature
|June 17, 2006
概括
杂交物种化,即新物种从两个不同的血统中产生,可以由杂交特征驱动. 这项研究表明,蝶如何表现.
科学领域:
- 进化生物学是进化的生物学.
- 规格研究研究 规格研究
- 动物遗传学 动物遗传学
背景情况:
- 品种化通常涉及血统分裂,但杂交品种化是一种罕见的替代方案.
- 杂交物种发生在两个不同的血统合并形成一种新物种时.
- 蝶物种Heliconius heurippa表现出杂交物种化的特征.
研究的目的:
- 调查杂交特征是否可以直接导致动物物种的繁殖隔离.
- 在实验室环境中重现Heliconius heurippa的中间翅膀颜色和图案.
- 确定杂交表型在伴侣识别和生殖隔离中的作用.
主要方法:
- 在实验室中,Heliconius melpomene,Heliconius cydno及其F1杂交物进行了交叉.
- 分析了由此产生的后代表型,特别是翅膀颜色和图案.
- 进行了伴侣偏好实验,以评估物种之间的繁殖隔离.
主要成果:
- 重建的Heliconius heurippa的中间翅膀颜色和图案通过实验室交叉成功生成.
- 伴侣偏好实验揭示了所有三种物种之间强烈的分类交配.
- 已经证明,Heliconius heurippa的杂交表型会导致其与其父母物种的生殖隔离.
结论:
- 杂交特征可以直接导致繁殖隔离,支持杂交物种化作为一种机制.
- 从父母物种中获得的特定的翅膀图案和颜色元素对于Heliconius heurippa的伴侣识别至关重要.
- 这项研究提供了直接证据,证明杂交特征在驱动动物物种化中的作用.
相关概念视频
00:53Migration
Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
01:07Speciation Rates
Overview
01:21Frequency-dependent Selection
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.
02:39Predator-Prey Interactions
Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.
02:16Genetics of Speciation
Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
02:29Hybrid Zones
Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.