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Related Concept Videos

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...
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...
Keystone Species01:39

Keystone Species

Measures of species biodiversity, such as richness (i.e., the number of species present) and evenness (i.e., their relative abundance), describe an ecological community’s structure. Many factors affect community structure, including abiotic factors (e.g., sunlight and nutrients), disturbances (e.g., fire or flood), species interactions (e.g., predation or competition), and chance events (e.g., foreign species invasion). Certain species—such as keystone species—also play a pivotal role in the...
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...
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...
Transgenic Organisms00:53

Transgenic Organisms

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Updated: Jun 11, 2026

Assessing Intertidal Populations of the Invasive European Green Crab
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Assessing Intertidal Populations of the Invasive European Green Crab

Published on: September 16, 2020

Defining an invasive species.

F Moutou1, P P Pastoret

  • 1Agence Française de Sécurite Sanitaire des Aliments, Laboratoire d'Etudes et de Recherches en Pathologie Animale et Zoonoses, 23 Avenue du Général-de-Gaulle, 94706 Maisons-Alfort, France.

Revue Scientifique Et Technique (International Office of Epizootics)
|July 13, 2010
PubMed
Summary
This summary is machine-generated.

Defining invasive species requires considering human impact and ecological context. Intentional introductions of domestic animals, wildlife, and microbes highlight the varied consequences, including significant health risks.

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Integrating Remote Sensing with Species Distribution Models; Mapping Tamarisk Invasions Using the Software for Assisted Habitat Modeling (SAHM)
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Published on: October 11, 2016

Related Experiment Videos

Last Updated: Jun 11, 2026

Assessing Intertidal Populations of the Invasive European Green Crab
06:48

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Published on: September 16, 2020

Integrating Remote Sensing with Species Distribution Models; Mapping Tamarisk Invasions Using the Software for Assisted Habitat Modeling (SAHM)
12:26

Integrating Remote Sensing with Species Distribution Models; Mapping Tamarisk Invasions Using the Software for Assisted Habitat Modeling (SAHM)

Published on: October 11, 2016

Area of Science:

  • Ecology
  • Biogeography
  • Conservation Biology

Background:

  • Human activities have led to widespread species introductions globally.
  • The definition of invasive species is often observer-dependent and context-specific.
  • Historical and contemporary species movements have profound ecological implications.

Purpose of the Study:

  • To explore various definitions of invasive species.
  • To analyze intentional species transport cases (domestic animals, wildlife, microorganisms).
  • To support definitions with practical examples and ecological perspectives.

Main Methods:

  • Review of historical and contemporary species transport examples.
  • Analysis of intentional introductions for pest control and other purposes.
  • Comparison of biogeographical and ecological definitions of invasiveness.

Main Results:

  • Intentional introductions of domestic animals, wild species, and microbes are common.
  • Biogeographical and ecological definitions offer complementary perspectives on invasiveness.
  • Species movements have diverse consequences, with health impacts being critical.

Conclusions:

  • A practical, context-aware definition of invasive species is needed.
  • Human-mediated species transport necessitates careful consideration of ecological and health impacts.
  • Understanding species movement dynamics is crucial for conservation and biosecurity.