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Related Concept Videos

What is Biodiversity?01:19

What is Biodiversity?

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Biodiversity describes the variety of living things at multiple organizational levels: genetic, species and ecosystem diversity. Species diversity includes all branches of the evolutionary tree from single-celled prokaryotic organisms, bacteria, and archaea, to the eukaryotic kingdoms: plants; animals; fungi; and protists. To date, there have been about 1.75 million species identified, and new species are discovered every week.
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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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According to statistical moment theory, mean residence time (MRT) is an important measure in pharmacokinetics. MRT can be defined as the expected mean of a probability density function distribution. It provides valuable insights into drug disposition in the body.
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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
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Updated: Jan 22, 2026

A Method to Define the Effects of Environmental Enrichment on Colon Microbiome Biodiversity in a Mouse Colon Tumor Model
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A Residence Time Theory for Biodiversity.

Kenneth J Locey, Jay T Lennon

    The American Naturalist
    |June 29, 2019
    PubMed
    Summary

    Residence time theory integrates ecosystem size and flow rates to explain biodiversity. This framework advances understanding of life history, community assembly, and ecological patterns across all organism scales.

    Area of Science:

    • Ecology
    • Biodiversity Science
    • Theoretical Ecology

    Background:

    • Earth's biodiversity faces physical turnover, impacting biological systems.
    • Residence time (ecosystem size/flow rate) is crucial but underutilized in biodiversity studies.
    • Existing ecological theories lack a unified framework incorporating physical turnover effects.

    Purpose of the Study:

    • To propose a novel residence time theory for ecological systems.
    • To explain how residence time influences growth, activity, abundance, and diversity.
    • To integrate residence time into broader ecological and evolutionary theories.

    Main Methods:

    • Developed a residence time theory based on ecosystem size and flow rates.
    • Utilized thousands of stochastic individual-based models for simulations.
    Keywords:
    chemostatdormancyemergent propertiesindividual-based modelsmacroecologymetabolic theory of ecology

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  • Incorporated energetically constrained life-history processes into models.

    • Main Results:

    • Simulations demonstrated conceptual soundness and compatibility of residence time theory.
    • The theory supports fundamental ecological relationships underpinning biodiversity.
    • Residence time influences trait and taxonomic diversity across scales.

    Conclusions:

    • Residence time is a unifying concept across the ecological hierarchy.
    • Integrating residence time theory can advance population genetics and macroecology.
    • This framework offers new insights into biodiversity patterns and ecological community assembly.