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Related Concept Videos

Natural Selection and Mating Preferences01:06

Natural Selection and Mating Preferences

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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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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.
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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.
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Evolutionary psychology explores the origins of human behavior and mental processes by framing them within the context of natural selection, a theory famously propounded by Charles Darwin. This field asserts that many behaviors common across human societies — ranging from instinctive fear reactions to complex social interactions — arose as evolutionary adaptations. These adaptations enhanced the survival and reproductive success of our ancestors, thereby becoming embedded in the...
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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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Manipulation of Color Patterns in Jumping Spiders for Use in Behavioral Experiments
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Predation drives complex eco-evolutionary dynamics in sexually selected traits.

Brian A Lerch1, Maria R Servedio1

  • 1Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America.

Plos Biology
|April 3, 2023
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Density-dependent predation can drive complex eco-evolutionary cycles in sexual displays, potentially maintaining trait variation. This challenges simple models by revealing feedback loops between predator-prey dynamics and sexual selection.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Theoretical Biology

Background:

  • Sexual selection theory often models predation risk as a static cost to elaborate sexual displays.
  • Predation risk, however, is density-dependent, meaning it changes with population sizes.
  • This density dependence is often omitted in models of sexual selection.

Purpose of the Study:

  • To develop population and quantitative genetic models linking sexual display evolution with predator-prey dynamics.
  • To investigate the feedback between predator-prey interactions and the evolution of sexually selected traits.
  • To explore novel outcomes arising from density-dependent predation in sexual selection.

Main Methods:

  • Developed integrated population and quantitative genetic models.
  • Explicitly incorporated density-dependent predation into models of sexual selection.
  • Analyzed the resulting eco-evolutionary dynamics.

Main Results:

  • Predation can drive eco-evolutionary cycles in sexually selected traits.
  • Density-dependent predation can maintain polymorphism (variation) in sexual displays.
  • Ecological dynamics are altered, with prey cycles being muted.

Conclusions:

  • Predation, when modeled as density-dependent, can be a powerful driver of complex eco-evolutionary dynamics.
  • This mechanism offers a potential explanation for the maintenance of variation in sexual displays.
  • Short-term studies may not capture the long-term, complex feedback loops between predation and sexual selection.