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Related Concept Videos

Speciation Rates

Speciation Rates

Formation of Species

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.

Genetics of Speciation

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.

Hybrid Zones

Hybrid Zones

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.

What is a Species?

What is a Species?

The Evidence for Evolution

The Evidence for Evolution

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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Related Experiment Video

Updated: Mar 23, 2026

Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae

Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae

Published on: December 2, 2022

What Is Speciation?

B Jesse Shapiro¹, Jean-Baptiste Leducq¹, James Mallet²

¹Département de sciences biologiques, Université de Montréal, Montréal, Quebec, Canada.

|April 1, 2016

Summary

This summary is machine-generated.

Microbial genomics reveals speciation is driven by natural selection, forming genetic clusters despite horizontal gene transfer. This challenges traditional species concepts across all life.

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Area of Science:

Evolutionary Biology
Microbial Genomics
Speciation Research

Background:

Species concepts are debated, with microbes presenting unique challenges due to genetic diversity, asexual reproduction, and horizontal gene transfer (HGT).
Microbial systems offer rapid evolution and accessible genomes, ideal for studying speciation in real-time.
Population genomics provides powerful tools to investigate evolutionary processes in microbial populations.

Purpose of the Study:

To review how microbial population genomics has advanced the understanding of speciation.
To explore how microbial speciation challenges and enriches existing species concepts.
To discuss the implications of microbial speciation for all domains of life.

Main Methods:

Review of comparative genomics studies in microbial, animal, and plant populations.
Analysis of genomic data to understand the role of recombination, including HGT and introgression.
Examination of evidence for natural selection in initiating and maintaining speciation.

Main Results:

Comparative genomics highlights the significant impact of HGT on genome evolution, questioning the primacy of vertical descent in speciation.
Speciation in microbes, animals, and plants is shaped by recombination processes.
Natural selection plays a crucial role in the initiation and maintenance of species.

Conclusions:

Species exist as discernible clusters of genetic and ecological similarity.
Speciation is primarily driven by natural selection, irrespective of the balance between horizontal and vertical gene transfer.
Lessons from microbial speciation offer universal insights into evolutionary processes across the tree of life.