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Related Concept Videos

Conservation of Small Populations02:04

Conservation of Small Populations

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Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
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Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
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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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Habitat Fragmentation02:31

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Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.
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Keystone Species01:39

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Measures of species biodiversity, such as richness (i.e., the number of species present) and evenness (i.e., their relative abundance), describe an ecological community’s structure. Many factors affect community structure, including abiotic factors (e.g., sunlight and nutrients), disturbances (e.g., fire or flood), species interactions (e.g., predation or competition), and chance events (e.g., foreign species invasion). Certain species—such as keystone species—also play a...
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Related Experiment Video

Updated: Mar 13, 2026

At-Risk Butterfly Captive Propagation Programs to Enhance Life History Knowledge and Effective Ex Situ Conservation Techniques
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Endangered at What Level?

Gordon H Orians

    Ecological Applications : a Publication of the Ecological Society of America
    |May 1, 1993
    PubMed
    Summary

    The Endangered Species Act is ineffective due to late intervention and a narrow focus. Expanding protections to habitats and ecosystems requires a robust ecological classification system, which is currently lacking and politically challenging.

    Area of Science:

    • Conservation Biology
    • Environmental Policy
    • Ecology

    Background:

    • The Endangered Species Act (ESA) faces challenges in effectively protecting biodiversity.
    • Current ESA limitations include delayed action until species are critically endangered and a focus on individual species rather than broader ecological contexts.

    Purpose of the Study:

    • To identify the key limitations of the current Endangered Species Act.
    • To explore the need for and challenges associated with expanding ESA protections to habitats and ecosystems.
    • To highlight the necessity of a standardized ecological classification system for effective conservation.

    Main Methods:

    • Literature review and policy analysis of the Endangered Species Act's effectiveness.
    • Conceptual analysis of ecological classification systems and their application to conservation.

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  • Identification of policy gaps and future research directions.

    • Main Results:

    • The ESA's reactive approach and species-specific focus hinder proactive conservation efforts.
    • Protecting endangered habitats, communities, and ecosystems is proposed as a necessary expansion of the Act.
    • A significant barrier to this expansion is the absence of a universally accepted ecological classification system.

    Conclusions:

    • Reforming the Endangered Species Act requires a shift towards proactive, ecosystem-based conservation strategies.
    • The development of a standardized ecological classification system is crucial for implementing broader conservation measures.
    • Overcoming political and scientific challenges in creating such a system is essential for the future success of species and habitat protection.