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Related Concept Videos

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.
Recycling Endosomes and Transcytosis00:58

Recycling Endosomes and Transcytosis

The recycling endosome, also known as the endosomal recycling compartment (ERC), is a part of the slow-recycling process of the endocytic pathway. Molecules internalized through receptor-mediated endocytosis are either degraded in the lysosomes or are recycled to the plasma membrane through the fast- or slow-recycling route.
The recycling endosome is not a single organelle but an extensively tubulated network of recycling pathways. It functions in storing molecules or transporting them across...
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.
What are Biogeochemical Cycles?00:54

What are Biogeochemical Cycles?

The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.
Bioremediation00:46

Bioremediation

Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
Microbial Wastewater Treatment01:30

Microbial Wastewater Treatment

Microbial communities in aquatic ecosystems play a key role in the natural breakdown of contaminants introduced through domestic and industrial effluents. Acting as biological catalysts, these microbes change and mineralize a wide range of organic and inorganic pollutants under different redox conditions.In oxygen-rich surface waters, aerobic heterotrophs lead organic matter breakdown, using oxygen as the terminal electron acceptor to efficiently oxidize substrates to carbon dioxide and water.

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Related Experiment Video

Updated: Jun 10, 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

Consumer-mediated recycling and cascading trophic interactions.

Shawn J Leroux1, Michel Loreau

  • 1Department of Biology, McGill University, 1205 Ave. Docteur Penfield, Montréal, Québec H3A 1B1, Canada. shawn.leroux@mail.mcgill.ca

Ecology
|August 19, 2010
PubMed
Summary

Consumer-mediated recycling positively impacts primary producers, sometimes more than predator regulation of herbivores. Ecosystem models reveal nutrient recycling strength depends on prey preference and nutrient loading.

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Area of Science:

  • Ecology
  • Ecosystem Dynamics
  • Theoretical Ecology

Background:

  • Trophic cascades are complex, involving direct and indirect consumer effects.
  • Research often emphasizes predator regulation of herbivores, overlooking nutrient recycling.
  • Aquatic ecosystems show consumer-mediated recycling can significantly boost primary producers.

Purpose of the Study:

  • To model and test hypotheses on consumer-mediated recycling in trophic cascades.
  • To compare the effects of herbivore regulation versus nutrient recycling on producers.
  • To identify conditions influencing the strength of these ecological interactions.

Main Methods:

  • Developed an ecosystem model with recipient- and donor-controlled trophic relationships.
  • Incorporated parameters for turnover rates, recycling efficiencies, and nutrient loading.
  • Simulated scenarios to test four hypotheses derived from empirical work.

Main Results:

  • Predator regulation of herbivores generally has stronger positive effects on producers than recycling.
  • Consumer-mediated recycling consistently shows a positive effect on producer stocks.
  • Recycling effects are amplified when predators prefer allochthonous prey and have high attack rates.
  • Recycling effects are diminished with low external nutrient loading.

Conclusions:

  • Consumer-mediated recycling is a significant factor in trophic cascades, alongside predator-prey dynamics.
  • The relative importance of recycling versus regulation depends on prey preference, nutrient availability, and turnover rates.
  • Generalizing trophic cascade hypotheses requires considering diverse mechanisms and ecosystem conditions.