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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.Allopatric SpeciationIn allopatric speciation, gene flow between two populations of the same species is prevented by a geographic barrier, like...

Genetics of Speciation

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...

Speciation Rates

Speciation Rates

Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.

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.Gene flow and natural selection are evolutionary mechanisms that shape the outcome of a hybrid zone. Gene flow...

Understanding Species and Reproductive Barriers

Understanding Species and Reproductive Barriers

A species is a group of organisms that interbreed and produce fertile offspring. Typically, individuals of the same species appear similar and share common characteristics due to their highly similar genomes. However, not all organisms that look alike are members of the same species. Various mechanisms keep most species discrete. While some mechanisms prevent reproductive behavior and fertilization (pre-zygotic isolation), others prevent the production of fertile offspring after mating has...

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.The collection of fossils within sedimentary rocks give a record of common ancestry and often depicts the history of evolution.

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Related Experiment Video

Updated: Jun 18, 2026

In situ Protocol for Butterfly Pupal Wings Using Riboprobes

In situ Protocol for Butterfly Pupal Wings Using Riboprobes

Published on: May 28, 2007

Polymorphic butterfly reveals the missing link in ecological speciation.

Nicola L Chamberlain¹, Ryan I Hill, Durrell D Kapan

¹Faculty of Arts and Sciences Center for Systems Biology, Harvard University, Cambridge, MA 02138, USA.

Science (New York, N.Y.)

|November 7, 2009

Summary

This summary is machine-generated.

This study reveals a key stage in ecological speciation where distinct traits emerge within a single population. Butterflies with color differences showed assortative mating, bridging the gap between interbreeding groups and new species.

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Area of Science:

Evolutionary biology
Speciation research
Behavioral ecology

Background:

Ecological speciation drives reproductive isolation through divergent selection.
A critical, understudied phase involves trait segregation within a single population.
Understanding this stage is key to linking interbreeding populations with distinct species.

Purpose of the Study:

Investigate the early stages of ecological speciation.
Examine trait segregation and mate preference in a polymorphic butterfly population.
Identify the link between ecological divergence and reproductive isolation.

Main Methods:

Employed genetic mapping and population genetics.
Conducted mate-choice experiments and field observations.
Studied a butterfly population exhibiting mimetic wing color polymorphism.

Main Results:

Observed partial, color-based, assortative mate preference in butterflies.
Documented the segregation of ecologically and reproductively relevant traits.
Demonstrated the association between a recognition trait and mating behavior within a population.

Conclusions:

The observed traits represent key components of sexual isolation in incipient species.
This population provides an example of the missing link in speciation.
The association between trait and behavior may accelerate speciation probability.