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What is an Ecosystem?01:17

What is an Ecosystem?

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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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All organisms have a position within an ecosystem. The complete set of living and nonliving factors—including food resources, climate, and terrain—that define the position of a given organism are collectively referred to as the organism’s ecological niche.Multiple species cannot occupy the exact same niche within their habitat. If the niches of two or more species overlap to a large extent, the competitive exclusion principle dictates that one species will outcompete the other, forcing it to...
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An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.Ecological disturbances can be caused by an event as small as the trampling of underbrush to an incident as wide-ranging as a forest...
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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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Related Experiment Video

Updated: Jul 5, 2026

Ecotoxicological Methodologies to Evaluate Biomarkers at Different Scales in Neotropical Anurans
08:14

Ecotoxicological Methodologies to Evaluate Biomarkers at Different Scales in Neotropical Anurans

Published on: April 28, 2023

Ecological networks and their fragility.

José M Montoya1, Stuart L Pimm, Ricard V Solé

  • 1School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS, UK.

Nature
|July 21, 2006
PubMed
Summary

Ecological networks reveal complex species interactions, from predation to pollination. Studying these intricate webs offers insights into ecosystem mechanisms and stability.

Area of Science:

  • Ecology
  • Evolutionary Biology

Background:

  • Charles Darwin's "tangled bank" metaphor highlights the complexity of species interactions.
  • Interactions include antagonistic (predation, herbivory, parasitism) and mutualistic (pollination) relationships.
  • These complex interactions can be visualized as ecological networks.

Purpose of the Study:

  • To explore the patterns within ecological networks.
  • To understand the ecological mechanisms driving these patterns.
  • To investigate the relationship between ecological network complexity and stability.

Main Methods:

  • Conceptualization of species interactions as ecological networks.
  • Analysis of network patterns to infer underlying ecological mechanisms.
  • Examination of the link between network structure and ecosystem stability.

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Main Results:

  • Ecological networks exhibit well-defined patterns despite their complexity.
  • These patterns illuminate the mechanisms governing species interactions.
  • Network analysis provides a framework for understanding ecosystem stability.

Conclusions:

  • Ecological networks offer a powerful tool for studying complex ecosystems.
  • Understanding network patterns is key to deciphering ecological mechanisms.
  • The study of ecological networks promises insights into ecosystem stability and resilience.