Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Hybrid Zones02:29

Hybrid Zones

21.6K
Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.
21.6K
What is a Species?01:17

What is a Species?

49.0K
Overview
49.0K
Genetics of Speciation02:16

Genetics of Speciation

20.7K
Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
20.7K
Formation of Species01:31

Formation of Species

44.4K
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.
44.4K
Speciation Rates01:07

Speciation Rates

22.5K
Overview
22.5K
Frequency-dependent Selection01:21

Frequency-dependent Selection

22.9K
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.
22.9K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Cross-decades stability of an avian hybrid zone.

Journal of evolutionary biology·2019
Same author

Population genomic analyses reveal a highly differentiated and endangered genetic cluster of northern goshawks (<i>Accipiter gentilis laingi</i>) in Haida Gwaii.

Evolutionary applications·2019
Same author

Comparative analysis examining patterns of genomic differentiation across multiple episodes of population divergence in birds.

Evolution letters·2018
Same author

A comparison of genomic islands of differentiation across three young avian species pairs.

Molecular ecology·2018
Same author

Sex chromosomes and speciation in birds and other ZW systems.

Molecular ecology·2018
Same author

Admixture mapping in a hybrid zone reveals loci associated with avian feather coloration.

Proceedings. Biological sciences·2017

Related Experiment Video

Updated: Dec 20, 2025

Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae
05:39

Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae

Published on: December 2, 2022

3.0K

Assortative Mating in Hybrid Zones Is Remarkably Ineffective in Promoting Speciation.

Darren E Irwin

    The American Naturalist
    |May 30, 2020
    PubMed
    Summary

    Low hybrid fitness, not assortative mating, is more effective in preventing species blending during speciation. This finding challenges the traditional view of prezygotic isolation

    Keywords:
    assortative matingcline theoryhybrid zonepremating isolationprezygotic isolationspeciation

    More Related Videos

    Using the Fluorescent Dye, Rhodamine B, to Study Mating Competitiveness in Male Aedes aegypti Mosquitoes
    07:10

    Using the Fluorescent Dye, Rhodamine B, to Study Mating Competitiveness in Male Aedes aegypti Mosquitoes

    Published on: May 7, 2021

    5.2K
    Genetic Mapping of Thermotolerance Differences Between Species of Saccharomyces Yeast via Genome-Wide Reciprocal Hemizygosity Analysis
    10:08

    Genetic Mapping of Thermotolerance Differences Between Species of Saccharomyces Yeast via Genome-Wide Reciprocal Hemizygosity Analysis

    Published on: August 12, 2019

    17.5K

    Related Experiment Videos

    Last Updated: Dec 20, 2025

    Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae
    05:39

    Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae

    Published on: December 2, 2022

    3.0K
    Using the Fluorescent Dye, Rhodamine B, to Study Mating Competitiveness in Male Aedes aegypti Mosquitoes
    07:10

    Using the Fluorescent Dye, Rhodamine B, to Study Mating Competitiveness in Male Aedes aegypti Mosquitoes

    Published on: May 7, 2021

    5.2K
    Genetic Mapping of Thermotolerance Differences Between Species of Saccharomyces Yeast via Genome-Wide Reciprocal Hemizygosity Analysis
    10:08

    Genetic Mapping of Thermotolerance Differences Between Species of Saccharomyces Yeast via Genome-Wide Reciprocal Hemizygosity Analysis

    Published on: August 12, 2019

    17.5K

    Area of Science:

    • Evolutionary biology
    • Speciation research
    • Population genetics

    Background:

    • Partial prezygotic isolation is traditionally considered more crucial than partial postzygotic isolation in early speciation.
    • Secondary contact between diverging populations allows for the study of reproductive isolation mechanisms.

    Purpose of the Study:

    • To investigate the relative importance of assortative mating and reduced hybrid fitness in preventing population blending.
    • To examine how these factors influence hybrid zone dynamics during secondary contact.

    Main Methods:

    • Computer simulations were used to model secondary contact between two populations.
    • The models incorporated varying degrees of assortative mating and reduced hybrid fitness.
    • The width of the resulting hybrid zone was analyzed to assess the strength of isolation.

    Main Results:

    • A small reduction in hybrid fitness (10%) resulted in a narrower hybrid zone compared to strong, imperfect assortative mating.
    • Strong assortative mating, without postzygotic isolation, can lead to a continuum of intermediates due to hybrids mating with each other.
    • The effectiveness of assortative mating in preventing blending is limited unless it is very strong, complete, or associated with high mate-search costs.

    Conclusions:

    • Reduced hybrid fitness is a more potent force than assortative mating in preventing species blending.
    • The concept of partial prezygotic isolation may be less significant than previously thought unless coupled with postzygotic isolation.
    • These findings necessitate a re-evaluation of the roles of prezygotic and postzygotic isolation in speciation.