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Related Concept Videos

Trophic Efficiency00:46

Trophic Efficiency

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.
Freshwater Microbial Ecology01:24

Freshwater Microbial Ecology

Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic systems...
Marine Microbial Ecology01:30

Marine Microbial Ecology

Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
Trophic Levels01:35

Trophic Levels

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.
Microbial Interactions: Competition01:26

Microbial Interactions: Competition

Microbial competition is an ecological interaction in which microorganisms vie for limited resources within shared environments. These resources may include nutrients, space, or light, depending on the system. The intensity and outcome of competition are influenced by the environmental context, such as nutrient availability, spatial constraints, and the diversity of microbial species present. These competitive interactions significantly influence the structure, function, and resilience of...
What is an Ecosystem?01:17

What is an Ecosystem?

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Related Experiment Video

Updated: May 12, 2026

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
10:20

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter

Published on: March 12, 2013

Trophic complexity enhances ecosystem functioning in an aquatic detritus-based model system.

Jérémy Jabiol1, Brendan G McKie, Andreas Bruder

  • 1EcoLab (Laboratoire écologie fonctionnelle et environnement), Université de Toulouse, UPS, INPT, 118 route de Narbonne, Bât. 4R1, 31062, Toulouse Cedex 9, France; EcoLab, CNRS, 31055, Toulouse, France.

The Journal of Animal Ecology
|April 12, 2013
PubMed
Summary
This summary is machine-generated.

Biodiversity loss impacts ecosystem functioning. Experiments show that simultaneous species loss across multiple food web levels, not just within one, causes more severe functional impairment in leaf-litter decomposition.

Keywords:
aquatic hyphomycetesbiodiversity and ecosystem functioningdetritivoresfungilitter decompositionshreddersstreamtrophic cascade

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Published on: July 30, 2019

Area of Science:

  • Ecology
  • Ecosystem Functioning
  • Biodiversity Research

Background:

  • Global biodiversity decline poses challenges to understanding ecosystem functioning.
  • Consequences of species loss within (horizontal) or across (vertical) trophic levels are known, but interactive effects of simultaneous losses are less understood.
  • Assessing interactive effects is difficult in experiments with large species.

Purpose of the Study:

  • To experimentally assess the consequences of biodiversity changes in horizontal and vertical food web components on leaf-litter decomposition.
  • To investigate how simultaneous species loss at different trophic levels affects ecosystem functioning.
  • To understand the role of trophic complexity in mediating diversity effects.

Main Methods:

  • Utilized a detritus-based model system for experiments.
  • Manipulated fungal decomposer diversity (0, 1, or 5 species).
  • Manipulated detritivore diversity (0, 1, or 3 species) and included predatory fish scent.

Main Results:

  • Trophic complexity is crucial for diversity effects on ecosystem functioning.
  • Highest leaf-litter decomposition rates occurred in the most complete community with highest species richness across all trophic levels.
  • Trait-mediated effects were observed, with detritivore foraging responses influenced by predator scent.

Conclusions:

  • Interactive effects of simultaneous species loss across multiple trophic levels are important for ecosystem functioning.
  • Functional impairment from biodiversity loss may be underestimated by studies focusing on single trophic levels.
  • Maintaining species richness across food webs is vital for ecosystem health.