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Related Concept Videos

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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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To understand intra-specific interactions in populations, scientists measure the spatial arrangement of species individuals. This geographic arrangement is known as the species distribution or dispersion. Highly territorial species exhibit a uniform distribution pattern, in which individuals are spaced at relatively equal distances from one another. Species that are highly tied to particular resources, such as food or shelter, tend to concentrate around those resources, and thus exhibit a...
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Monitoring Spatial Segregation in Surface Colonizing Microbial Populations
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Spatial sorting promotes the spread of maladaptive hybridization.

Winsor H Lowe1, Clint C Muhlfeld2, Fred W Allendorf1

  • 1Division of Biological Sciences, University of Montana, Missoula, MT 59812, USA.

Trends in Ecology & Evolution
|July 1, 2015
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Summary

Invasive hybridization threatens biodiversity. Spatial sorting, where dispersal-linked genes spread, explains how invasive hybrids expand geographically, even with low survival rates, impacting native species.

Keywords:
biodiversityconservationdispersalevolutionintrogressioninvasive species

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Conservation Biology

Background:

  • Invasive hybridization poses a significant threat to global biodiversity.
  • The spread of introgressed genes can persist despite reduced hybrid fitness over time.
  • Understanding the mechanisms driving hybrid expansion is crucial for conservation efforts.

Purpose of the Study:

  • To explain the paradox of invasive hybrid spread despite reduced fitness.
  • To highlight the role of spatial sorting in facilitating hybrid expansion.
  • To underscore the importance of understanding spatial sorting for biodiversity protection.

Main Methods:

  • This study is primarily theoretical, synthesizing existing research on invasive hybridization and spatial sorting.
  • It analyzes ecological and evolutionary principles governing gene flow and population dynamics.
  • The explanation relies on conceptual models of range expansion and genetic admixture.

Main Results:

  • Spatial sorting, favoring dispersal traits, drives hybrid expansion at range edges.
  • Invasive hybrids can increase in frequency through space, not just time, via spatial sorting.
  • Nonnative admixture can rise even if hybrid offspring have low survival rates.

Conclusions:

  • Spatial sorting is a key mechanism enabling invasive hybrid spread and admixture.
  • Protecting native biodiversity requires a deeper understanding of spatial sorting dynamics.
  • Further research into spatial sorting is essential for effective conservation strategies against invasive hybridization.