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Trophic Efficiency

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.

Trophic Levels

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.

What is an Ecosystem?

What is an Ecosystem?

Ecological Niches

Ecological Niches

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.

Predator-Prey Interactions

Predator-Prey Interactions

Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.

Keystone Species

Keystone Species

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: Aug 15, 2025

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

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

Published on: March 21, 2025

Analyzing trophic ecosystem functions with the interaction functional space.

Carolina Bello¹, Matthias Schleuning², Catherine H Graham³

¹Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, 8903 Birmensdorf, Switzerland; Institute of Integrative Biology, ETH Zürich, Universitätstrasse 2, 8092 Zürich, Switzerland.

Trends in Ecology & Evolution

|January 4, 2023

Summary

This summary is machine-generated.

Understanding ecosystem functions under global change is key. We introduce the interaction functional space (IFS) to link species traits and interactions, revealing how these affect ecosystem processes like seed dispersal and decomposition.

Keywords:

ecosystem functions species interactions trait diversity

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Area of Science:

Ecology
Ecosystem Science
Global Change Biology

Background:

Ecosystem functions are crucial for quantifying global change impacts.
Current research often separates functional diversity and network ecology approaches.
A unified framework is needed to understand how traits and interactions shape ecosystem functions.

Purpose of the Study:

To propose the interaction functional space (IFS) as a novel conceptual framework.
To integrate functional diversity and network ecology for analyzing trophic functions.
To demonstrate the IFS's utility in understanding ecosystem responses to global change.

Main Methods:

Developed the interaction functional space (IFS) framework.
Applied the IFS to exemplify seed dispersal and wood decomposition functions.
Analyzed how species interactions mediate the link between functional traits and trophic functions.

Main Results:

The IFS framework effectively integrates trait-based and interaction-based ecological perspectives.
Demonstrated how species interactions modulate the relationship between functional trait diversity and ecosystem functions.
Highlighted the IFS's applicability across various trophic functions.

Conclusions:

The IFS provides a powerful tool for understanding the mechanisms driving ecosystem functions.
This framework facilitates the prediction of functional changes in ecosystems under global change.
Integrating traits and interactions is essential for robust ecological assessments.