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Related Concept Videos

The Evidence for Evolution02:55

The Evidence for Evolution

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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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Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.
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Limits to Natural Selection01:38

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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.
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Related Experiment Video

Updated: Feb 26, 2026

Palatable Western-style Cafeteria Diet as a Reliable Method for Modeling Diet-induced Obesity in Rodents
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A Neutral Model for the Evolution of Diet Breadth.

Matthew L Forister, Stephen H Jenkins

    The American Naturalist
    |July 22, 2017
    PubMed
    Summary

    Organism diet breadth, particularly insect specialization, is often unexplained. A spatial model suggests specialization arises from diversification dynamics, not direct selection, with host richness impacting herbivore taxa.

    Area of Science:

    • Ecology
    • Evolutionary Biology
    • Theoretical Biology

    Background:

    • Diet breadth variation is common but poorly explained.
    • Expected trade-offs in resource use are rarely detected.
    • Plant-feeding insects provide a model for diet breadth evolution.

    Purpose of the Study:

    • To explore a spatial model for the evolution of diet specialization.
    • To investigate factors influencing diet breadth in simulated communities.
    • To generate hypotheses for global patterns of herbivore diet breadth.

    Main Methods:

    • Developed a neutral spatial model for diet breadth evolution.
    • Simulated communities without direct trade-offs or selection pressures on diet.
    • Analyzed the resulting distribution of specialized and generalized species.
    Keywords:
    generalistneutral modelsimulationspecialist

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    Main Results:

    • Simulated communities mirrored natural patterns, dominated by specialists.
    • A predictable, less species-rich component of generalists emerged.
    • Specialization may result from stochastic diversification dynamics.

    Conclusions:

    • Diet specialization could be a byproduct of diversification, not direct selection.
    • Host plant richness positively influences specialized herbivore taxa.
    • Host plant abundance evenness negatively impacts specialized herbivore taxa.