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Related Concept Videos

Competition02:34

Competition

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.
Microbial Interactions: Competition01:26

Microbial Interactions: Competition

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...
Predator-Prey Interactions02:39

Predator-Prey Interactions

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.
Frequency-dependent Selection01:21

Frequency-dependent Selection

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.
Evolution of New Traits in Microbes01:24

Evolution of New Traits in Microbes

Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
Limits to Natural Selection01:38

Limits to Natural Selection

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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Related Experiment Video

Updated: May 14, 2026

Assessing Differences in Sperm Competitive Ability in Drosophila
09:34

Assessing Differences in Sperm Competitive Ability in Drosophila

Published on: August 22, 2013

Pattern formation by competition: a biological example.

M Bezzi1, A Ciliberto, A Mengoni

  • 1Dipartimento di Fisica dell', Università and Sezione I.N.F.N. di Bologna, Via Irnerio 46, 40126 Bologna, Italy.

Journal of Biological Physics
|January 25, 2013
PubMed
Summary
This summary is machine-generated.

Resource competition drives pattern formation in Streptomyces bacteria. A reaction-diffusion model explains the spatial patterns observed in aerial mycelium growth across different nutrient conditions.

Keywords:
competitionfitnessmulticellular bacteriapattern formation

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Digital PCR-based Competitive Index for High-throughput Analysis of Fitness in Salmonella
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Last Updated: May 14, 2026

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Area of Science:

  • Microbiology
  • Mathematical Biology
  • Systems Biology

Background:

  • Multicellular bacteria like Streptomyces exhibit complex spatial patterns during growth.
  • Understanding the mechanisms behind these patterns is crucial for comprehending bacterial development and colony behavior.

Purpose of the Study:

  • To develop and validate a simple model for pattern formation in Streptomyces.
  • To investigate the role of resource competition in driving spatial organization within bacterial colonies.

Main Methods:

  • A reaction-diffusion equation was employed to model bacterial growth and interaction.
  • Simulations were performed for conditions of minimal (low resource) and maximal (high resource) nutrient availability.

Main Results:

  • The reaction-diffusion model successfully reproduced the observed spatial patterns of Streptomyces aerial mycelium.
  • The model demonstrated that competition for resources is a key factor in generating these patterns.
  • Distinct patterns emerged under low versus high resource conditions, aligning with experimental observations.

Conclusions:

  • Resource competition is a fundamental mechanism underlying pattern formation in multicellular bacteria.
  • The developed reaction-diffusion model provides a valuable tool for studying bacterial morphogenesis and colony dynamics.
  • This work offers insights into how simple ecological interactions can lead to complex biological structures.