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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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Predator-Prey Interactions02:39

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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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Frequency-dependent Selection01:21

Frequency-dependent Selection

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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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What is Natural Selection?01:32

What is Natural Selection?

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Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
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Limits to Natural Selection01:38

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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.
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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.
Females, due to their biological roles in conception, pregnancy, and nursing,...
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Evidence for the Stability Selection Mechanism in a Live Predator-Prey System.

John P DeLong1, Kyle E Coblentz1, Kristi L Montooth1

  • 1School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska, USA.

Ecology Letters
|March 20, 2026
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Summary
This summary is machine-generated.

Stability selection, where species loss is driven by extinction susceptibility, can cause evolutionary change. This study shows prey genetics influence predator-prey stability, driving evolution in aggregate populations.

Keywords:
didiniumeco‐evolutionary dynamicsparameciumpredator–preystabilitystability selection

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Population Genetics

Background:

  • Stability selection describes species loss due to extinction susceptibility, a non-adaptive process.
  • Despite being non-adaptive, stability selection can drive evolutionary change by linking population stability to heritable traits.

Purpose of the Study:

  • To demonstrate how stability selection influences prey genetics and drives evolutionary change in a predator-prey system.
  • To provide empirical evidence for the stability selection mechanism in eco-evolutionary dynamics.

Main Methods:

  • Utilized a live predator-prey system to investigate stability selection.
  • Analyzed how prey genetics affect predator-prey pair stability and population extinction.
  • Examined trait evolution in aggregate populations resulting from the loss of unstable subpopulations.

Main Results:

  • Prey genetics were found to influence predator-prey stability, indicating potential for differential extinction to shape population genotypic makeup.
  • The extinction of unstable predator-prey pairs in subpopulations led to observable trait evolution in the aggregate population.
  • Demonstrated empirical support for the stability selection mechanism.

Conclusions:

  • Community-level interactions, such as predator-prey dynamics, can drive eco-evolutionary change at the population level.
  • Stability selection, though non-adaptive, plays a significant role in evolutionary processes by influencing heritable traits and population structure.