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Related Concept Videos

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...
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.
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...
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...
Types of Selection01:46

Types of Selection

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 in Ficedula flycatchers.

Anna Qvarnström1, Amber M Rice, Hans Ellegren

  • 1Animal Ecology/Department of Ecology and Evolution, Uppsala University, Norbyvägen 18D, 752 36 Uppsala, Sweden. anna.qvarnstrom@ebc.uu.se

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|May 5, 2010
PubMed
Summary
This summary is machine-generated.

Speciation in animals involves ecological divergence, sexual isolation, and genetic incompatibility. Research on flycatchers reveals key genetic factors on the Z-chromosome driving these reproductive isolation stages.

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Area of Science:

  • Evolutionary biology
  • Speciation research
  • Animal behavior

Background:

  • Speciation, the formation of new species, typically progresses through ecological divergence, sexual isolation, and genetic incompatibility.
  • Empirical evidence for the final stages of speciation remains limited, despite theoretical consensus on favorable conditions.

Purpose of the Study:

  • To review recent research on animal speciation processes.
  • To investigate the interconnections between ecological divergence, sexual isolation, and genetic incompatibility.
  • To utilize the collared (Ficedula albicollis) and pied flycatcher (Ficedula hypoleuca) hybrid zones as a model system.

Main Methods:

  • Review of existing studies on flycatcher hybrid zones.
  • Analysis of ecological divergence in life-history traits.
  • Assessment of mate choice preferences based on plumage and song.
  • Examination of genetic incompatibility, including Haldane's rule.
  • Investigation of genetic factors on the Z-chromosome.

Main Results:

  • Ecological divergence is driven by differences in life-history traits.
  • Female flycatchers exhibit species-specific mate preferences based on plumage and song.
  • Male plumage has diverged, while song has converged in sympatry.
  • Genetic incompatibility is present, consistent with Haldane's rule.
  • The Z-chromosome is identified as a hotspot for genes related to sexual isolation and genetic incompatibility.

Conclusions:

  • The three major stages of speciation are empirically supported in flycatcher hybrid zones.
  • Genes on the Z-chromosome play a significant role in reproductive isolation.
  • Understanding these genetic links provides insights into the evolutionary processes driving speciation.