概括
野生鸟类避开了模仿有毒新的色彩的. 这项研究证明了模仿.
科学领域:
- 生态生态学 生态生态学
- 进化生物学 进化生物学
- 动物行为 动物行为
背景情况:
- 仿真是一种常见的进化策略,一种物种进化以类似另一种物种.
- 的模仿效果主要是在受控的实验室环境中研究的.
- 捕食者与猎物的相互作用对于塑造这些进化动态至关重要.
研究的目的:
- 为了研究在自然环境中,在沙兰中模仿对自由飞行的捕食鸟类的有效性.
- 为了确定禽类捕食者是否能区分模仿性和非模仿性三明形态.
- 提供模仿对野生鸟类有效性的第一个证据.
主要方法:
- 一个自由活动的鸟类群体展示了东方红背 (Plethodon cinereus) 的两个形态:模仿形态和非模仿形态.
- 这种模仿形态类似于有毒的红斑 (Notophthalmus viridescens) 的第一个阶段.
- 捕食事件被观察和记录以评估回避行为.
主要成果:
- 与非模仿形态相比,鸟类捕食者显著避免了Plethodon cinereus的模仿形态.
- 这种回避行为是在自然环境中观察到的,这些鸟类没有被关在子里.
- 在实验中还使用了美味的鱼Desmognathus ochrophaeus.
结论:
- 的模仿色彩是有效的威野生鸟类的掠食.
- 这项研究提供了第一份经验证据,证明模仿对自由活动的禽类捕食者的成功.
- 这些发现强调了视觉线索在捕食者与猎物的相互作用以及模仿的进化中的生态重要性.
相关概念视频
Predator-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.Although predation is commonly associated with carnivory, for...
Limits to Natural Selection
Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.For one, natural selection can only act upon existing genetic variation. Hypothetically, redtusks may enhance elephant survival by deterring ivory-seeking poachers. However, if there are no gene variants—or alleles—for redtusks, natural selection cannot increase the prevalence of...
Understanding Species and Reproductive Barriers
A species is a group of organisms that interbreed and produce fertile offspring. Typically, individuals of the same species appear similar and share common characteristics due to their highly similar genomes. However, not all organisms that look alike are members of the same species. Various mechanisms keep most species discrete. While some mechanisms prevent reproductive behavior and fertilization (pre-zygotic isolation), others prevent the production of fertile offspring after mating has...
Frequency-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.Positive Frequency-Dependent SelectionIn positive...
Conservation of Declining Populations
Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
Types of Selection
Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...


