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Related Concept Videos

Types of Selection01:46

Types of Selection

37.5K
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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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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Inclusive Fitness00:57

Inclusive Fitness

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Most altruistic behavior—in which one animal helps another at a cost to themselves—occurs between relatives. Scientists think these altruistic behaviors evolved because they increase the inclusive fitness of the animal providing help.
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Limits to Natural Selection01:38

Limits to Natural Selection

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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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Microbial Interactions: Competition01:26

Microbial Interactions: Competition

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Microbial competition is an ecological interaction in which microorganisms vie for limited resources within shared environments. These resources may include nutrients, space, or light, depending on the system. The intensity and outcome of competition are influenced by the environmental context, such as nutrient availability, spatial constraints, and the diversity of microbial species present. These competitive interactions significantly influence the structure, function, and resilience of...
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Competition02:34

Competition

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When organisms require the same limited resources within an environment, they may have to compete for them. Competition is a net-negative interaction. Even if two competing individuals or populations do not interact directly, the overall fitness of both competitors is lowered as a result of not having full access to the limited resource.
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Related Experiment Video

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New Variations for Strategy Set-shifting in the Rat
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Mobility-dependent selection of competing strategy associations.

Alexander Dobrinevski1, Mikko Alava2, Tobias Reichenbach3

  • 1CNRS-Laboratoire de Physique Théorique de l'Ecole Normale Supérieure, 24 rue Lhomond, 75005 Paris Cedex, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 4, 2014
PubMed
Summary

Ecological models can be simplified by studying strategy associations instead of individual species. A four-strategy bacterial system showed mobility influences selection between a three-strategy cycle or a neutral pair.

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Area of Science:

  • Ecology
  • Evolutionary Game Theory
  • Microbial Ecology

Background:

  • Traditional population dynamics models focus on individual species interactions.
  • Real ecosystems feature complex networks of numerous interacting species or strategies.
  • Studying strategy associations can offer a higher-level understanding of ecological dynamics.

Purpose of the Study:

  • To investigate a four-strategy system inspired by colicinogenic Escherichia coli.
  • To explore how higher-level descriptions of strategy associations can provide ecological insights.
  • To analyze the selection dynamics between a three-strategy cycle and a neutral pair.

Main Methods:

  • Development of a stochastic, spatial model.
  • Numerical analysis of the four-strategy system.
  • Analytical investigation of the observed phenomena.

Main Results:

  • The model demonstrated a mobility-dependent selection between a three-strategy cycle and a neutral pair.
  • This selection phenomenon was observed in the context of Escherichia coli strains.
  • Both numerical and analytical methods confirmed the findings.

Conclusions:

  • Higher-level descriptions of strategy associations offer valuable insights into complex ecological systems.
  • Mobility is a critical factor influencing the selection of strategy groups in microbial communities.
  • The study provides a novel perspective on understanding population dynamics in diverse species environments.