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Related Concept Videos

Types of Selection01:46

Types of Selection

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...
Fixed Action Patterns01:06

Fixed Action Patterns

A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
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.

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Long-term Behavioral Tracking of Freely Swimming Weakly Electric Fish
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Front acceleration by dynamic selection in Fisher population waves.

O Bénichou1, V Calvez, N Meunier

  • 1Laboratoire de Physique Théorique de la Matière Condensée, UMR 7600 CNRS/UPMC, 4 Place Jussieu, 75255 Paris Cedex, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 11, 2012
PubMed
Summary
This summary is machine-generated.

Neutral phenotypic variability alone can drive phenotype segregation during population range expansion. This segregation accelerates the expansion wave

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Mathematical Biology

Background:

  • Population range expansion is a key ecological process.
  • Phenotypic differences can influence expansion dynamics, but selective advantages are often assumed.
  • Neutral variability's role in segregation and speed is less understood.

Purpose of the Study:

  • To investigate if neutral phenotypic variability can cause segregation at the expansion front.
  • To determine the impact of neutral phenotypic variability on the speed of population range expansion.
  • To provide a theoretical model compatible with empirical observations.

Main Methods:

  • Developed a minimal mathematical model of population range expansion.
  • Incorporated individuals with differing neutral diffusion rates (no selective advantage).
  • Derived an exact asymptotic traveling wave solution for analysis.

Main Results:

  • Neutral phenotypic variability alone can lead to phenotype segregation at the expansion front.
  • Segregation significantly impacts the dynamics of the expansion wave.
  • Analytical results show that phenotype segregation accelerates front propagation.

Conclusions:

  • Neutral phenotypic variability is a crucial factor in population range expansion dynamics.
  • Phenotype segregation can enhance invasion speed without selection.
  • The model aligns with field observations of invasive species like cane toads and bush crickets.