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Related Concept Videos

Trophic Levels01:35

Trophic Levels

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All organisms in an ecosystem occupy a trophic level in the food chain. The lowest level consists of primary producers, which synthesize their food from either solar or chemical energy. Each subsequent level obtains energy from the levels below. Detritivores can occupy any of the levels above primary producers.
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Ecological Disturbance02:26

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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.
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What is an Ecosystem?01:17

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Overview
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What is Biodiversity?01:19

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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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Trophic Efficiency00:46

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Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain.
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Diversity of Protists II01:27

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Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...

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Related Experiment Video

Updated: Jun 5, 2025

JenaTron - An Experimental Approach to Study the Effects of Plant History and Soil History on Grassland Ecosystem Functioning
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JenaTron - An Experimental Approach to Study the Effects of Plant History and Soil History on Grassland Ecosystem Functioning

Published on: March 21, 2025

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Ecosystem stability relies on diversity difference between trophic levels.

Yizhou Liu1,2, Jiliang Hu1, Jeff Gore1

  • 1Physics of Living Systems, Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139.

Proceedings of the National Academy of Sciences of the United States of America
|December 6, 2024
PubMed
Summary
This summary is machine-generated.

Ecological community stability hinges on diversity differences between trophic levels, not absolute species counts. Similar diversity levels create instability, while differences enhance ecosystem resilience.

Keywords:
diversityecologystabilitytrophic level

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Area of Science:

  • Ecology
  • Theoretical Ecology
  • Community Ecology

Background:

  • The relationship between biodiversity and ecosystem stability is a central, debated topic in ecology.
  • Previous research has yielded conflicting findings on whether higher biodiversity enhances or diminishes stability.
  • Human well-being is directly linked to ecosystem stability through services and health.

Purpose of the Study:

  • To investigate the role of diversity differences between trophic levels in determining ecological community stability.
  • To resolve conflicting theories on the biodiversity-stability relationship.
  • To develop a quantitative stability criterion based on inter-level diversity.

Main Methods:

  • Analysis of a minimal two-level ecosystem model with multiple predator and prey species.
  • Derivation of an analytical stability criterion.
  • Extension of the model to three trophic levels and other interaction types (e.g., cross-feeding).

Main Results:

  • Community stability is determined by diversity differences between trophic levels, not absolute diversity.
  • Increasing diversity in one level shows a reentrant transition: initial destabilization followed by stabilization.
  • Least stable communities exhibit similar diversity levels across different trophic levels.
  • The derived stability criterion quantifies the impact of inter-level interaction correlations.

Conclusions:

  • The structure of trophic levels and diversity disparities are critical for ecosystem stability.
  • A nonmonotonic dependence of stability on diversity explains varied empirical observations.
  • The findings offer a new framework for predicting ecosystem behavior and stability.