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Related Concept Videos

Distribution and Dispersion00:54

Distribution and Dispersion

Ecology is the study of how organisms interact with their environment and with one another. An important aspect of ecology is understanding where species are found and how individuals are distributed within those areas. The geographic range of a species refers to the total area where its members are located, while dispersion describes the pattern of spacing of individuals within that range.Geographic Range and Dispersion PatternsWithin a species’ geographic range, individuals may be distributed...
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Dihybrid Crosses

Overview
Law of Independent Assortment02:03

Law of Independent Assortment

While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.
Law of Independent Assortment02:03

Law of Independent Assortment

While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.
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Gene Flow

Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
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Formation of Species

Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.Allopatric SpeciationIn allopatric speciation, gene flow between two populations of the same species is prevented by a geographic barrier, like...

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Dispersal Propensity and Dispersal Distance Are Genetically Independent Traits in a Stream Salamander.

Winsor H Lowe1, Brett R Addis1, Madaline M Cochrane1

  • 1Division of Biological Sciences, University of Montana, Missoula, Montana, USA.

Molecular Ecology
|June 16, 2026
PubMed
Summary

Dispersal evolution is complex, but new research shows dispersal propensity and distance are independent genetic traits. Understanding these distinct traits is key to advancing knowledge of dispersal evolution in species like the salamander.

Keywords:
capture‐recapture analysisdispersal distancedispersal evolutionmigrationplethodontidsalamander

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Area of Science:

  • Ecology and Evolutionary Biology
  • Population Genetics

Background:

  • Empirical understanding of dispersal evolution is limited by the complexity of dispersal processes and challenges in direct quantification.
  • Dispersal is often characterized by propensity (emigration response) and distance, but the evolutionary independence of these traits is poorly understood.

Purpose of the Study:

  • To investigate the genetic basis of dispersal propensity and dispersal distance in the salamander *Gyrinophilus porphyriticus*.
  • To determine if dispersal propensity and dispersal distance are independent traits subject to different selective pressures.

Main Methods:

  • Utilized capture-recapture data and single nucleotide polymorphism (SNP) genotypes from 1906 salamanders over 10 years.
  • Quantified dispersal propensity and distance directly using recapture histories.
  • Employed principal component analysis on SNP genotypes to identify axes of genetic variation associated with dispersal traits.

Main Results:

  • Dispersal propensity and dispersal distance were significantly associated with different axes of genetic variation.
  • This indicates that propensity and distance are independent evolutionary traits.
  • Identified 81 non-dispersers and 92 dispersers among 173 recaptured individuals, with dispersal distances ranging from 4 to 1248 m.

Conclusions:

  • Dispersal propensity and distance represent independent traits that can evolve under different selective forces.
  • Quantifying these distinct traits and their interactions is crucial for advancing the study of dispersal evolution.
  • This research provides a framework for future studies on the genetic underpinnings of animal dispersal.