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Related Concept Videos

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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Interference and Decay01:16

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Forgetting is a complex cognitive phenomenon influenced by several factors, among which interference and decay are particularly prominent. These processes explain why individuals often struggle to retrieve specific information from memory, leading to lapses in recall that can be observed in everyday situations.
Interference occurs when competing memories hinder the retrieval of particular information. It can be classified into two types: proactive and retroactive interference. Proactive...
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Interference: Path Lengths01:10

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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
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Sound Waves: Interference00:53

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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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Interference and Diffraction02:18

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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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Interference and Superposition of Waves01:07

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When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
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Updated: Nov 9, 2025

Daily Transfers, Archiving Populations, and Measuring Fitness in the Long-Term Evolution Experiment with Escherichia coli
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Experimental Evolution of Interference Competition.

Florien A Gorter1,2,3, Carolina Tabares-Mafla1, Rees Kassen4

  • 1Laboratory of Genetics, Wageningen University & Research, Wageningen, Netherlands.

Frontiers in Microbiology
|April 12, 2021
PubMed
Summary
This summary is machine-generated.

Evolution of toxin production in Pseudomonas aeruginosa showed that antagonism decreased without competitors but varied with different recipients present. This highlights the dynamic nature of interference competition.

Keywords:
Pseudomonas aeruginosabacteriocinsbacteriophageclinical isolatesinterference competitionpyocinsrepeated serial transfer

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Microbiology

Background:

  • Interference competition, involving antagonistic traits like toxin production, is crucial in ecology.
  • The evolutionary dynamics of toxin-mediated competition remain incompletely understood.
  • Toxin production is generally considered advantageous when facing competitors.

Purpose of the Study:

  • To investigate the evolution of antagonism via toxin (pyocin) production in *Pseudomonas aeruginosa*.
  • To determine how long-term selection affects pyocin production in the presence and absence of competitors.
  • To understand the role of specific recipient strains in shaping the evolution of interference competition.

Main Methods:

  • Utilized *Pseudomonas aeruginosa* PAO1, a pyocin-producing strain, for experimental evolution.
  • Conducted ten serial transfers with and without three different clinical isolates as recipients.
  • Measured changes in pyocin inhibition as an indicator of evolved antagonism.

Main Results:

  • Pyocin inhibition significantly decreased when *P. aeruginosa* was cultured without any recipient.
  • The evolution of antagonism differed depending on the specific recipient isolate present.
  • Experimental evolution demonstrated that interference competition can either decrease or increase.

Conclusions:

  • The evolution of interference competition through toxin production is context-dependent.
  • The presence and identity of competitors critically influence the trajectory of antagonistic trait evolution.
  • This study experimentally validates the significance of interference competition in shaping species interactions.