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Related Concept Videos

Symbiosis00:58

Symbiosis

Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...
Ecological Niches02:02

Ecological Niches

All organisms have a position within an ecosystem. The complete set of living and nonliving factors—including food resources, climate, and terrain—that define the position of a given organism are collectively referred to as the organism’s ecological niche.Multiple species cannot occupy the exact same niche within their habitat. If the niches of two or more species overlap to a large extent, the competitive exclusion principle dictates that one species will outcompete the other, forcing it to...
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.Intraspecific competition, which occurs between individuals of the same species, serves as a natural mechanism for regulating population size. Too much...
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.For one, natural selection can only act upon existing genetic variation. Hypothetically, redtusks may enhance elephant survival by deterring ivory-seeking poachers. However, if there are no gene variants—or alleles—for redtusks, natural selection cannot increase the prevalence of...
Genetics of Speciation02:16

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...
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...

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Related Experiment Video

Updated: Jul 10, 2026

Monitoring Intraspecies Competition in a Bacterial Cell Population by Cocultivation of Fluorescently Labelled Strains
06:45

Monitoring Intraspecies Competition in a Bacterial Cell Population by Cocultivation of Fluorescently Labelled Strains

Published on: January 18, 2014

Interspecific competition: a new approach to the classical theory.

J H Vandermeer

    Science (New York, N.Y.)
    |April 18, 1975
    PubMed
    Summary

    The classical competition theory

    Area of Science:

    • Ecology
    • Theoretical Biology
    • Mathematical Biology

    Background:

    • Classical competition theory is a cornerstone of ecological and evolutionary studies.
    • The interpretation of constants within competition models can influence outcomes.
    • Understanding these interpretations is crucial for accurate biological predictions.

    Purpose of the Study:

    • To investigate how different interpretations of constants in classical competition theory affect its biological consequences.
    • To demonstrate that alternative, plausible interpretations can lead to altered outcomes.

    Main Methods:

    • Analysis of simple mathematical equations used in classical competition theory.
    • Exploration of various interpretations for specific constants within these equations.

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    Coincubation Assay for Quantifying Competitive Interactions between Vibrio fischeri Isolates

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    Last Updated: Jul 10, 2026

    Monitoring Intraspecies Competition in a Bacterial Cell Population by Cocultivation of Fluorescently Labelled Strains
    06:45

    Monitoring Intraspecies Competition in a Bacterial Cell Population by Cocultivation of Fluorescently Labelled Strains

    Published on: January 18, 2014

    Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity
    08:16

    Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity

    Published on: March 13, 2014

    Coincubation Assay for Quantifying Competitive Interactions between Vibrio fischeri Isolates
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    Coincubation Assay for Quantifying Competitive Interactions between Vibrio fischeri Isolates

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    Main Results:

    • Biological consequences derived from classical competition theory are sensitive to the interpretation of specific constants.
    • Altered consequences can be achieved through different, yet equally plausible, interpretations of these constants.

    Conclusions:

    • The biological implications of classical competition theory are not solely determined by the equations themselves, but also by the interpretation of their parameters.
    • This highlights the need for careful consideration and explicit statement of parameter interpretations in ecological modeling.