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Related Concept Videos

Limits to Natural Selection01:38

Limits to Natural Selection

Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.For one, natural selection can only act upon existing genetic variation. Hypothetically, redtusks may enhance elephant survival by deterring ivory-seeking poachers. However, if there are no gene variants—or alleles—for redtusks, natural selection cannot increase the prevalence of...
Competition02:34

Competition

When organisms require the same limited resources within an environment, they may have to compete for them. Competition is a net-negative interaction. Even if two competing individuals or populations do not interact directly, the overall fitness of both competitors is lowered as a result of not having full access to the limited resource.Intraspecific competition, which occurs between individuals of the same species, serves as a natural mechanism for regulating population size. Too much...
Types of Selection01:46

Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
Conservation of Small Populations02:04

Conservation of Small Populations

Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less likely to...
Genetic Drift03:33

Genetic Drift

Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.Life is not fair. A deer grazing contentedly in a field can have her meal cut tragically short by a bolt of lightning. If the doomed doe is one of only three in the population, 1/3 of the population’s gene pool is lost. Random events like this can...
Threats to Biodiversity01:50

Threats to Biodiversity

There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...

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Updated: Jun 26, 2026

Primer Extension Capture: Targeted Sequence Retrieval from Heavily Degraded DNA Sources
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Published on: September 3, 2009

Neanderthal extinction by competitive exclusion.

William E Banks1, Francesco d'Errico, A Townsend Peterson

  • 1Institut de Préhistoire et de Géologie du Quaternaire, UMR 5199-PACEA, Université Bordeaux 1, CNRS, Talence, France. w.banks@ipgq.u-bordeaux1.fr

Plos One
|December 25, 2008
PubMed
Summary

Neanderthals did not go extinct due to climate change. Instead, competition with anatomically modern humans (AMH) during their geographic expansion likely caused Neanderthal extinction.

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Area of Science:

  • Paleoanthropology
  • Paleoclimatology
  • Archaeology

Background:

  • Debate persists on Neanderthal extinction causes: climate change versus competition with anatomically modern humans (AMH).
  • Understanding Neanderthal extinction is crucial for human evolutionary studies.

Purpose of the Study:

  • To investigate the roles of climate change and AMH competition in Neanderthal extinction.
  • To define eco-cultural niches of Neanderthals and AMH during Marine Isotope Stage 3.

Main Methods:

  • Integrated archaeological and chronological data with high-resolution paleoclimatic simulations.
  • Defined eco-cultural niches for Neanderthal and AMH adaptive systems during cold and mild climate phases.
  • Analyzed Neanderthal range contraction in southwestern Europe during Greenland Interstadial 8.

Main Results:

  • Neanderthals and AMH exploited similar ecological niches.
  • Niche overlap persisted even without direct contact.
  • Neanderthal range contraction was not linked to climate or adaptation changes.

Conclusions:

  • Neanderthal extinction was driven by competition with expanding AMH populations.
  • Concurrent AMH geographic expansion, not climate change, led to Neanderthal demise.
  • This study refines our understanding of late Pleistocene hominin interactions and extinction dynamics.