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Related Concept Videos

Speciation Rates01:07

Speciation Rates

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Overview
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Genetics of Speciation02:16

Genetics of Speciation

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Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
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Reinforcement01:23

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Positive and negative reinforcement are key concepts in operant conditioning, a learning process where the consequences of a behavior affect the likelihood of that behavior being repeated.
Positive reinforcement occurs when a behavior is followed by the presentation of a rewarding stimulus, increasing the frequency of that behavior. For example:
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Corrosion of Reinforcement01:27

Corrosion of Reinforcement

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The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
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Reinforcement Schedules01:24

Reinforcement Schedules

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Positive reinforcement is a powerful method for teaching new behaviors to both animals and humans. B.F. Skinner demonstrated this with his experiments using rats in a Skinner box. When a rat pressed a lever, it received a food pellet. This immediate reward encouraged the rat to repeat the behavior. This method, where a reward follows every instance of the behavior, is known as continuous reinforcement. It is highly effective for establishing new behaviors quickly.
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Reinforcements in Concrete01:25

Reinforcements in Concrete

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Reinforced concrete is a composite material used extensively in construction, combining the compressive strength of concrete with the tensile strength of steel. This synergy is essential as concrete, while excellent at resisting compression, is weak under tension. Steel bars, or rebars, are embedded in the concrete to handle these tensile forces. The choice of steel is strategic; it shares a similar coefficient of thermal expansion with concrete, which ensures uniformity in response to...
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Related Experiment Video

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Novel Apparatus and Method for Drug Reinforcement
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Coupling, Reinforcement, and Speciation.

Roger K Butlin, Carole M Smadja

    The American Naturalist
    |January 20, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Speciation involves the evolution of multiple reproductive isolation barriers. Their coincidence, termed "coupling," significantly enhances gene flow barriers, a process that requires further investigation in speciation research.

    Keywords:
    adaptationgene flowlinkage disequilibriumreproductive isolationspecies

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    Area of Science:

    • Evolutionary Biology
    • Genetics
    • Speciation Research

    Background:

    • Reproductive isolation barriers are crucial for speciation.
    • Multiple barrier effects and their coincidence are necessary for strong reproductive isolation.

    Purpose of the Study:

    • Define and explore the concept of "coupling" in speciation.
    • Highlight the importance of considering both the origin and coupling of barrier effects in speciation research.

    Main Methods:

    • Conceptual framework development.
    • Review of theoretical and empirical speciation research.

    Main Results:

    • "Coupling" is defined as the coincidence of barrier effects, strengthening overall isolation.
    • Coincidence can arise as a byproduct or through adaptive selection.
    • An extended view of reinforcement includes coupling and enhancement of barrier effects.

    Conclusions:

    • Speciation research must integrate the study of barrier effect origins with their coupling mechanisms.
    • An expanded concept of reinforcement, encompassing coupling, offers new directions for research.