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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...
Ecological Niches02:02

Ecological Niches

All organisms have a position within an ecosystem. The complete set of living and nonliving factors—including food resources, climate, and terrain—that define the position of a given organism are collectively referred to as the organism’s ecological niche.Multiple species cannot occupy the exact same niche within their habitat. If the niches of two or more species overlap to a large extent, the competitive exclusion principle dictates that one species will outcompete the other, forcing it to...
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.
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...
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...
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...

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Visually Sexing Loggerhead Shrike (Lanius Ludovicianus) Using Plumage Coloration and Pattern
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"Same same but different": replicated ecological speciation at White Sands.

Erica Bree Rosenblum1, Luke J Harmon

  • 1Department of Biological Sciences, University of Idaho, Moscow, ID 83844-3051, USA. rosenblum@uidaho.edu

Evolution; International Journal of Organic Evolution
|November 16, 2010
PubMed
Summary
This summary is machine-generated.

This study examines three lizard species at White Sands, New Mexico, revealing unequal progress in ecological speciation due to varied geographic contexts and multifarious selection pressures. Understanding these differences illuminates general mechanisms of species formation.

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Area of Science:

  • Evolutionary Biology
  • Speciation Research
  • Ecology

Background:

  • Ecological speciation is key to understanding biodiversity.
  • Generalizing speciation processes is challenging due to unique case studies.
  • Replicated speciation events offer insights into commonalities and differences.

Purpose of the Study:

  • To investigate factors influencing ecological speciation using replicated lizard species.
  • To assess similarities and differences in speciation progress across taxa in a shared environment.
  • To identify mechanisms driving speciation in a natural setting.

Main Methods:

  • Studied three lizard species at White Sands, New Mexico.
  • Utilized multilocus nuclear DNA data to assess genetic divergence.
  • Employed morphometric analyses to identify traits under selection.
  • Incorporated geographic context to explain speciation differences.

Main Results:

  • All three lizard species show evidence of ecological speciation.
  • Progress toward speciation is unequal among the studied species.
  • Selection pressures are strong, multifarious, and affect traits beyond coloration.
  • Geographic context significantly influences the rate of speciation.

Conclusions:

  • Replicated ecological speciation provides a powerful model for studying species formation.
  • Geographic context and diverse selection pressures shape unequal speciation trajectories.
  • Comparative studies of similar yet distinct cases reveal speciation mechanisms.