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Related Concept Videos

Speciation Rates01:07

Speciation Rates

Overview
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.
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.
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.
Ecological Succession02:17

Ecological Succession

Ecological succession is influenced by the processes of facilitation, inhibition, and toleration. Facilitation occurs when early successional species create more favorable ecological conditions for subsequent species, such as enhanced nutrient, water, or light availability. In contrast, inhibition happens when early successional species create unfavorable ecological conditions for potential successive species, such as limiting resource availability. In some cases, later successional species...
The Evidence for Evolution02:55

The Evidence for Evolution

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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Related Experiment Video

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Generating Controlled, Dynamic Chemical Landscapes to Study Microbial Behavior
10:07

Generating Controlled, Dynamic Chemical Landscapes to Study Microbial Behavior

Published on: January 31, 2020

Ecological speciation in dynamic landscapes.

R Aguilée1, A Lambert, D Claessen

  • 1Laboratoire Écologie et Évolution, UPMC Univ Paris 06, Ecole Normale Supérieure, CNRS, Paris, France. robin.aguilee@univ-montp2.fr

Journal of Evolutionary Biology
|September 30, 2011
PubMed
Summary
This summary is machine-generated.

Dynamic landscapes drive speciation by repeatedly connecting and dividing populations. Landscape changes influence evolutionary outcomes, particularly under disruptive selection, necessitating allopatric phases for reproductive isolation.

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Area of Science:

  • Evolutionary Biology
  • Ecology
  • Population Genetics

Background:

  • Ecological speciation models typically assume fixed geography, neglecting dynamic landscape changes.
  • Geological, climatic, and ecological processes cause landscape shifts, leading to population divisions and reconnections.

Purpose of the Study:

  • To investigate the impact of landscape dynamics on speciation.
  • To model the interplay between allopatry-sympatry oscillations and evolutionary processes.

Main Methods:

  • Utilized a stochastic, sexual population model with polygenic inheritance.
  • Integrated a landscape dynamics model simulating allopatry-sympatry oscillations.

Main Results:

  • Under stabilizing selection, allopatry promotes diversity but hinders species coexistence.
  • Refuge persistence in allopatry is contingent on landscape dynamics timescales.
  • Disruptive selection necessitates allopatry for ecological differentiation, with sympatric phases crucial for reproductive isolation via reinforcement.

Conclusions:

  • Landscape dynamics significantly influence speciation.
  • The history and future geographical arrangements are critical factors in the speciation process.