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Related Concept Videos

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.
Convergent Evolution01:54

Convergent Evolution

Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.The structures that arise from convergent evolution are called analogous structures. They are similar in function even if they are dissimilar in structure. Further, structures can be analogous while also...
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...
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.The collection of fossils within sedimentary rocks give a record of common ancestry and often depicts the history of evolution.
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...
Natural Selection and Adaptation01:15

Natural Selection and Adaptation

Natural selection, a fundamental concept in evolutionary biology, is the mechanism by which evolution is driven, favoring organisms that are best adapted to their environments. This process enhances their chances of survival and reproduction. Adaptation, a key outcome of this process, involves genetic modifications that optimize an organism's functionality under specific environmental challenges, such as extreme cold or thinner air at high altitudes.
Beyond physical adaptations, psychological...

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Updated: Jun 25, 2026

Resurrection of Dormant Daphnia magna: Protocol and Applications
07:37

Resurrection of Dormant Daphnia magna: Protocol and Applications

Published on: January 19, 2018

Adaptive radiation: contrasting theory with data.

Sergey Gavrilets1, Jonathan B Losos

  • 1Department of Ecology, National Institute for Mathematical and Biological Synthesis, University of Tennessee, Knoxville, TN 37996, USA. sergey@tiem.utk.edu

Science (New York, N.Y.)
|February 7, 2009
PubMed
Summary
This summary is machine-generated.

Adaptive radiation drives evolutionary group diversity through complex ecological and genetic factors. Modeling reveals 10 key patterns, but more empirical data are needed for a complete understanding.

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Area of Science:

  • Evolutionary Biology
  • Ecology
  • Genetics

Background:

  • High species diversity in certain evolutionary groups has long intrigued biologists.
  • Adaptive radiation is a complex evolutionary process shaped by ecological, genetic, developmental, and historical factors.

Purpose of the Study:

  • To identify general patterns in the temporal, spatial, and genetic/morphological properties of adaptive radiation.
  • To synthesize current understanding and highlight areas needing further research.

Main Methods:

  • Utilized modeling approaches to analyze adaptive radiation.
  • Reviewed and synthesized existing empirical data.

Main Results:

  • Identified 10 general patterns characterizing adaptive radiation.
  • Found strong empirical support for some patterns, while others require more data.
  • Highlighted the need for extensive data collection across various aspects of adaptive radiation.

Conclusions:

  • Adaptive radiation is a multifaceted process requiring integrated theoretical and empirical research.
  • Future advancements depend on combining modeling with robust empirical evidence.
  • Further data collection is crucial for a comprehensive understanding of adaptive radiation dynamics.