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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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Evolutionary psychology explores the origins of human behavior and mental processes by framing them within the context of natural selection, a theory famously propounded by Charles Darwin. This field asserts that many behaviors common across human societies — ranging from instinctive fear reactions to complex social interactions — arose as evolutionary adaptations. These adaptations enhanced the survival and reproductive success of our ancestors, thereby becoming embedded in the...
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Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
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Related Experiment Video

Updated: Jan 1, 2026

Resurrection of Dormant Daphnia magna: Protocol and Applications
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Evolutionary Rescue from a Wave of Biological Invasion.

J David Van Dyken

    The American Naturalist
    |December 24, 2019
    PubMed
    Summary

    Evolution can help rescue populations from invasive species, but rescue is less likely during interference competition than exploitation competition. Understanding these differences aids conservation and biocontrol efforts.

    Area of Science:

    • Ecology
    • Evolutionary Biology
    • Conservation Biology

    Background:

    • Biological invasions pose a significant threat to native species, leading to population declines and extinctions.
    • Predicting the potential for evolutionary rescue (ER) in resident populations facing invasion is crucial for effective conservation strategies.
    • Understanding the dynamics of competition between native and invasive species is key to assessing extinction risks.

    Purpose of the Study:

    • To derive theoretical predictions for evolutionary rescue in resident populations invaded by a competitor.
    • To compare the effectiveness of evolutionary rescue under two distinct competition modes: exploitation and interference.
    • To investigate how invasion characteristics (e.g., dispersal, speed, range size) influence the likelihood of evolutionary rescue.

    Main Methods:

    Keywords:
    Fisher waveadaptationbistable traveling wavecompetitioncontinuous spacedispersalstepping-stone model

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    • Theoretical modeling of spatial invasion dynamics.
    • Derivation of conditions for evolutionary rescue under different competition scenarios.
    • Comparative analysis of rescue likelihood based on invasion parameters.

    Main Results:

    • Evolutionary rescue is less effective against interference competition than exploitation competition.
    • Rescue from interference-driven invasions is independent of invader dispersal rate and invasion speed.
    • Rescue from exploitation-driven invasions is highly dependent on resident range size and negatively impacted by fast invasions.

    Conclusions:

    • Interference competition presents a greater challenge for evolutionary rescue than exploitation competition.
    • Conservation and biocontrol strategies must account for the specific mode of competition during invasions.
    • Theoretical predictions can inform management decisions for conserving endemic species and controlling invasive pests.