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Related Concept Videos

Genetics of Speciation02:16

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 Rates01:07

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.
Formation of Species01:31

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...
The Evidence for Evolution02:55

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.
Hybrid Zones02:29

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 Barriers01:17

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...

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Resurrection of Dormant Daphnia magna: Protocol and Applications
07:37

Resurrection of Dormant Daphnia magna: Protocol and Applications

Published on: January 19, 2018

Ecology and speciation.

M R Orr1, T B Smith

  • 1Division of Insect Biology, 201 Wellman Hall, University of California, Berkeley, CA 94720, USA.

Trends in Ecology & Evolution
|January 18, 2011
PubMed
Summary
This summary is machine-generated.

Natural selection drives adaptive divergence and speciation through ecological shifts. New research shows these ecological changes can rapidly accelerate evolution, with experimental methods becoming increasingly valuable.

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Area of Science:

  • Evolutionary biology
  • Speciation research
  • Ecology and adaptation

Background:

  • Adaptive divergence and speciation are influenced by natural selection.
  • Ecological shifts and novel habitat invasions are key drivers.
  • Rapid evolutionary rates are increasingly recognized.

Purpose of the Study:

  • To review the role of natural selection in adaptive divergence.
  • To highlight rapid evolutionary divergence due to ecological shifts.
  • To discuss emerging experimental approaches linking divergence to speciation.

Main Methods:

  • Integration of field and laboratory studies.
  • Analysis of recent research on ecological divergence.
  • Exploration of experimental methodologies.

Main Results:

  • Natural selection is a significant factor in adaptive divergence.
  • Ecological shifts can lead to rapid evolutionary divergence.
  • Experimental approaches for studying speciation are developing.

Conclusions:

  • Ecological shifts are potent drivers of rapid evolution.
  • Further experimental research is needed to link divergence to speciation.
  • The study of adaptive divergence is a dynamic field.