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Related Concept Videos

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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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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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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...
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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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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Diversifying evolution of competitiveness.

Sebastian A Baldauf1, Leif Engqvist2, Franz J Weissing3

  • 11] Centre for Ecological and Evolutionary Studies, University of Groningen, Nijenborgh 7, Groningen 9747 AG, The Netherlands [2] Institute for Evolutionary Biology and Ecology, University of Bonn, An der Immenburg 1, 53121 Bonn, Germany.

Nature Communications
|October 30, 2014
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Summary
This summary is machine-generated.

Individual competitiveness, the ability to acquire resources, varies greatly. An evolutionary model explains this variation, showing it can lead to stable coexistence or cyclical shifts in competitive traits, with female preferences potentially causing extinction.

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Area of Science:

  • Evolutionary Biology
  • Behavioral Ecology

Background:

  • Individuals in many species exhibit phenotypic traits that influence resource acquisition.
  • Competitiveness, the ability to gain resources, varies significantly among individuals and over time.

Purpose of the Study:

  • To explain the observed variation in individual competitiveness using an evolutionary model.
  • To investigate the dynamics of competitiveness evolution under varying conditions.

Main Methods:

  • Development of an evolutionary model.
  • Assumption: Investment in competitiveness increases resource acquisition probability but decreases resource exploitation efficiency.

Main Results:

  • Model predicts competitiveness converges to a polymorphic state (stable coexistence of different strategies) or exhibits perpetual transitions between high and low competitiveness.
  • Incorporating female mate choice (preferences for or against competitive males) adds complexity.

Conclusions:

  • Evolutionary pressures can lead to stable diversity in competitive traits or dynamic fluctuations.
  • Extreme female preferences for competitiveness can negatively impact population viability, potentially leading to extinction.