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Related Concept Videos

Mate Choice01:20

Mate Choice

Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
Types of Selection01:46

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...
Natural Selection and Mating Preferences01:06

Natural Selection and Mating Preferences

The principle of natural selection posits that organisms better adapted to their environment are more likely to survive and reproduce. This principle is closely intertwined with mating preferences, a key aspect of sexual selection, which evolutionary psychologists believe is driven by instincts to propagate one's genes. Such instincts significantly influence mating behaviors and preferences between genders.
Females, due to their biological roles in conception, pregnancy, and nursing, inherently...
Frequency-dependent Selection01:21

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.
Ecological Disturbance02:26

Ecological Disturbance

An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.
Criticisms of the Evolutionary Perspective01:23

Criticisms of the Evolutionary Perspective

In a study where individuals posing as strangers offered compliments and proposed casual sex to students, the responses differed significantly based on gender. Not a single woman accepted the proposal, while 70% of the men agreed. This outcome provides a useful scenario to explore through the lens of evolutionary psychology and social learning theory, highlighting the diverse perspectives on human sexual behaviors.
Evolutionary psychology provides one explanation for these findings, suggesting...

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A Method to Test the Effect of Environmental Cues on Mating Behavior in Drosophila melanogaster
08:13

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Published on: July 17, 2017

Disruptive ecological selection on a mating cue.

Richard M Merrill1, Richard W R Wallbank, Vanessa Bull

  • 1Department of Zoology, University of Cambridge, Cambridge CB2 3EJ, UK. r.merrill@zoo.cam.ac.uk

Proceedings. Biological Sciences
|October 19, 2012
PubMed
Summary
This summary is machine-generated.

Speciation with gene flow is aided by traits influencing both ecology and mating. Heliconius butterfly wing patterns demonstrate disruptive ecological selection, confirming their role in speciation.

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Area of Science:

  • Evolutionary Biology
  • Speciation Research
  • Behavioral Ecology

Background:

  • Speciation can occur through adaptation to diverse ecological niches.
  • Traits influencing both ecological adaptation and mate choice (magic traits) are hypothesized to drive speciation with gene flow.
  • Empirical evidence for magic traits under divergent selection and assortative mating is limited.

Purpose of the Study:

  • To investigate the role of wing color patterns in Heliconius butterflies as magic traits.
  • To test if wing color patterns are under disruptive ecological selection and act as mating cues.
  • To provide empirical evidence for the role of magic traits in speciation.

Main Methods:

  • Field experiments using artificial butterflies mimicking natural wing patterns and avian vision.
  • Enclosure trials with live birds and actual Heliconius butterflies.
  • Analysis of predation rates on hybrid versus parental color morphs.

Main Results:

  • Hybrid wing pattern phenotypes experienced higher predation rates compared to parental forms.
  • Disruptive ecological selection was demonstrated on wing color patterns.
  • Wing color patterns were confirmed to function as both ecological traits under selection and mating cues.

Conclusions:

  • Wing color patterns in Heliconius butterflies act as magic traits, driving speciation.
  • Disruptive selection on traits involved in predator avoidance also influences mate recognition.
  • This study provides strong empirical support for the role of magic traits in generating biodiversity through speciation with gene flow.