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Related Concept Videos

Formation of Species01:31

Formation of Species

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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.
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Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
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Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
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Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
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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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Resurrection of Dormant Daphnia magna: Protocol and Applications
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Speciation along environmental gradients.

Michael Doebeli1, Ulf Dieckmann

  • 1Department of Zoology, University of British Columbia, Vancouver, Canada V6T 1Z4. doebeli@zoology.ubc.ca

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This summary is machine-generated.

Speciation can occur more easily along environmental gradients, even without geographical barriers. Spatial evolutionary branching promotes species segregation, linking local ecological processes to geographical patterns.

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Area of Science:

  • Evolutionary biology
  • Ecology
  • Speciation research

Background:

  • Traditional speciation models emphasize geographical isolation (allopatric speciation).
  • Gene flow can hinder diversification in the absence of geographical barriers.
  • Recent data suggest sympatric or adjacent species ranges, challenging traditional views.

Purpose of the Study:

  • To link geographical patterns with ecological speciation processes.
  • To investigate evolutionary branching in spatially structured populations.
  • To understand how environmental gradients influence speciation.

Main Methods:

  • Studied evolutionary branching in spatially structured populations.
  • Modeled speciation along environmental gradients.
  • Compared spatial models with non-spatial speciation models.

Main Results:

  • Evolutionary branching is facilitated along environmental gradients, especially those of intermediate slope.
  • Spatial models show easier speciation compared to non-spatial models.
  • Spatial evolutionary branching generates segregated and adjacent species ranges.

Conclusions:

  • Local adaptive divergence processes are crucial for geographical speciation patterns.
  • Environmental gradients can promote speciation even with ongoing gene flow.
  • Caution is advised when inferring past speciation from current biogeographical data.