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Related Concept Videos

Types of Selection01:46

Types of Selection

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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...
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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.
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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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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.
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Maintaining Laboratory Cultures of Gryllus bimaculatus, a Versatile Orthopteran Model for Insect Agriculture and Invertebrate Physiology
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Sexual selection: When crickets go quiet.

Allen J Moore1

  • 1Department of Entomology, University of Georgia, Athens, GA 30602, USA.

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Male cricket song mutations are usually disadvantageous, but a new study shows females may prefer novel songs. This flexible female preference allows new mutations to spread, demonstrating evolution in action.

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Area of Science:

  • Evolutionary biology
  • Animal behavior
  • Bioacoustics

Background:

  • Male cricket song is a critical trait for female mate choice.
  • Mutations altering song structure are generally expected to be selected against due to female preference.
  • Understanding the dynamics of sexual selection and song evolution is key to explaining biodiversity.

Purpose of the Study:

  • To investigate the impact of song mutations on male mating success in crickets.
  • To determine if female mate preferences are flexible and can adapt to novel male song traits.
  • To observe evolutionary processes in real-time concerning sexual selection and genetic mutations.

Main Methods:

  • Field observations of cricket populations to record song characteristics and mating outcomes.
  • Playback experiments presenting females with different song variants, including novel mutations.
  • Genetic analysis to track the spread of specific song-related mutations within the population.

Main Results:

  • Contrary to expectations, novel male cricket songs resulting from mutations were not at a disadvantage.
  • Females exhibited flexible mating preferences, sometimes favoring the new, mutated songs over traditional ones.
  • The study documented the rapid spread of song-altering mutations within the observed cricket population.

Conclusions:

  • Female mate choice can be more dynamic than previously assumed, readily accepting song innovations.
  • Mutations that alter male sexual signals can rapidly increase in frequency when females exhibit flexible preferences.
  • This research provides a direct example of rapid evolutionary change driven by sexual selection and female choice.