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Natural Selection and Mating Preferences01:06

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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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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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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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Post-Copulatory Sexual Selection in an Insect With High Levels of Mating Failure.

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Summary
This summary is machine-generated.

Sexual selection involves multiple interacting processes. In seed bugs, cryptic male choice for larger females and sperm competition both influence reproduction, but act largely independently.

Keywords:
Lygaeus simulanscryptic male choicemate choicemating failurepost‐copulatory sexual selectionsperm competition

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Area of Science:

  • Evolutionary Biology
  • Behavioral Ecology
  • Sexual Selection

Background:

  • Sexual selection encompasses diverse processes that can interact in complex ways.
  • In the seed bug *Lygaeus simulans*, limited pre-copulatory selection contrasts with significant post-copulatory selection, including frequent mating failures.
  • Previous research suggested cryptic male choice favoring larger, more fecund females.

Purpose of the Study:

  • To investigate the interaction between cryptic male choice and sperm competition in *Lygaeus simulans*.
  • To determine how male and female size influence reproductive success and paternity share.

Main Methods:

  • Experimental manipulation of male and female size variation into large and small classes.
  • Double-mating females with males across all size combinations.
  • Utilizing a visible mutant marker for paternity assignment.
  • Analyzing the impact of copulation duration on insemination success and paternity.

Main Results:

  • Sperm competition outcomes were primarily determined by copulation duration; longer copulations increased a male's paternity share.
  • Larger females had higher offspring production, linked to longer copulation durations and reduced mating failure.
  • Larger males showed a slight advantage in sperm competition, particularly when mating second.
  • Female size had minimal direct impact on paternity, indicating independent action of selection processes.

Conclusions:

  • Cryptic male choice for female size and sperm competition operate relatively independently in *Lygaeus simulans*.
  • Copulation duration is a key factor mediating both mating success and paternity share.
  • Understanding the interplay of different sexual selection components is crucial for evolutionary dynamics.