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Related Concept Videos

Phylogenetic Species Concept in Microbiology01:22

Phylogenetic Species Concept in Microbiology

The phylogenetic species concept (PSC) is a framework used to delineate species based on evolutionary relationships, emphasizing shared ancestry and diagnosable genetic traits. Unlike morphological or biological species concepts, the PSC is particularly advantageous for microbial taxonomy, where traditional reproductive or phenotypic criteria often fall short due to the prevalence of asexual reproduction, minimal morphological differentiation, and widespread horizontal gene transfer among...
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...
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...
Phylogeny01:23

Phylogeny

Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire...
Generalization, Discrimination, and Extinction01:24

Generalization, Discrimination, and Extinction

Generalization, discrimination, and extinction are key concepts in operant conditioning that influence how behaviors are learned and maintained.
Generalization occurs when a behavior reinforced in one context is performed in similar situations. For instance, a student who studies diligently for calculus and receives excellent grades might apply the same study habits to psychology and history, expecting similar results. Generalization shows how learning in one setting can influence behavior in...
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...

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A Concoction Pipeline for Generating Molecular Operational Taxonomic Units (MOTUs) Among Riparian and Aquatic Beetles
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Published on: July 11, 2025

Progress toward a general species concept.

Bernhard Hausdorf1

  • 1Zoological Museum, University of Hamburg, Martin-Luther-King-Platz 3, 20146 Hamburg, Germany. hausdorf@zoologie.uni-hamburg.de

Evolution; International Journal of Organic Evolution
|April 6, 2011
PubMed
Summary
This summary is machine-generated.

The species concept needs updating due to new genetic insights. A generalized genic concept defines species by fitness-affecting traits that resist gene flow, applicable across all organisms.

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Area of Science:

  • Evolutionary Biology
  • Genetics
  • Speciation Research

Background:

  • Recent decades reveal reproductive barriers are often semipermeable, allowing gene flow.
  • Species can diverge despite ongoing interbreeding and originate polyphyletically.
  • Uniparental organisms form distinct units analogous to species in biparental organisms.

Purpose of the Study:

  • To re-evaluate existing species concepts in light of new evidence.
  • To propose a generalized species concept accommodating recent insights.
  • To address the nature of species in the context of gene flow and differentiation.

Main Methods:

  • Review and synthesis of existing species concepts.
  • Analysis of new evidence on reproductive barriers and gene flow.
  • Development of a generalized genic species concept.

Main Results:

  • Existing species concepts require adjustment to account for semipermeable barriers and ongoing gene flow.
  • A generalized genic concept is proposed, defining species by reciprocal, fitness-reducing traits resistant to regular exchange.
  • This new concept accommodates differentiation despite interbreeding and applies to both uni- and biparental organisms.

Conclusions:

  • The proposed differential fitness species concept integrates new findings and resolves limitations of previous concepts.
  • It provides a unified framework for defining species across the biological spectrum.
  • This concept supports the recognition of distinct species even with incomplete reproductive isolation.