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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...

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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.

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All organisms in an ecosystem occupy a trophic level in the food chain. The lowest level consists of primary producers, which synthesize their food from either solar or chemical energy. Each subsequent level obtains energy from the levels below. Detritivores can occupy any of the levels above primary producers.

Trophic Efficiency

Trophic Efficiency

Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain.

Genetics of Speciation

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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...

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Related Experiment Video

Updated: Jun 25, 2026

A Concoction Pipeline for Generating Molecular Operational Taxonomic Units (MOTUs) Among Riparian and Aquatic Beetles

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Sequential sympatric speciation across trophic levels.

Andrew A Forbes¹, Thomas H Q Powell, Lukasz L Stelinski

¹Department of Biological Sciences, University of Notre Dame, Galvin Life Sciences Building, Notre Dame, IN 46556, USA. aaforbes@ucdavis.edu

Science (New York, N.Y.)

|February 7, 2009

Summary

This summary is machine-generated.

Biodiversity can drive its own evolution. New species create niches, triggering speciation across ecosystems. This study shows how parasitic wasps diversified alongside their diversifying fly hosts, demonstrating cascading speciation.

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Area of Science:

Ecology
Evolutionary Biology
Speciation Research

Background:

Biodiversity can be a driver of further diversification.
New species may create novel ecological niches, promoting further speciation.
The Rhagoletis pomonella (apple maggot fly) complex is a model system for studying sympatric speciation.

Purpose of the Study:

To investigate whether speciation can cascade across trophic levels.
To examine the role of host plant shifts in sympatric speciation.
To test if parasitic wasps diversify in response to their diversifying hosts.

Main Methods:

Studied the Rhagoletis pomonella fruit fly complex and its primary parasitoid, Diachasma alloeum.
Analyzed genetic and ecological data to assess species boundaries and host associations.
Investigated the evolution of host-related traits in both flies and wasps.

Main Results:

Diachasma alloeum has diversified into incipient species, specializing on different Rhagoletis pomonella host races.
Host-associated traits in Rhagoletis pomonella have rapidly evolved, creating reproductive isolation.
These fly-evolved traits also act as barriers to reproduction for the associated wasps.

Conclusions:

Speciation can cascade across trophic levels, initiated by host plant shifts in insects.
Niche construction by one species can drive diversification in interacting species.
The Rhagoletis-Diachasma system exemplifies rapid, multi-level speciation driven by ecological opportunity.