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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.

Primary Production

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.

What are Biogeochemical Cycles?

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.

Biological Clocks and Seasonal Responses

Biological Clocks and Seasonal Responses

The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.

What is an Ecosystem?

What is an Ecosystem?

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Related Experiment Video

Updated: Dec 20, 2025

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

Published on: March 6, 2014

Trophic control changes with season and nutrient loading in lakes.

Tanya L Rogers¹, Stephan B Munch¹, Simon D Stewart²

¹Southwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Santa Cruz, CA, 95060, USA.

Ecology Letters

|June 2, 2020

Summary

Trophic control in lake ecosystems is dynamic, not static. Zooplankton and phytoplankton interactions shift with nutrient levels and seasons, especially at the start of the growing season.

Keywords:

consumer control empirical dynamic modelling nutrients resource control species interactions temperature time series

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Last Updated: Dec 20, 2025

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Laboratory Estimation of Net Trophic Transfer Efficiencies of PCB Congeners to Lake Trout Salvelinus namaycush from Its Prey

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Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems

Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems

Published on: October 29, 2016

Area of Science:

Ecology
Limnology
Ecosystem Dynamics

Background:

Investigated trophic control (top-down and bottom-up) in lake ecosystems using long-term data.
Limited manipulative experiments in space and time hinder understanding of large-scale ecological processes.
Employed empirical dynamic modeling to quantify zooplankton-phytoplankton interactions over time across 13 global lakes.

Discussion:

Top-down effects varied with nutrient status, being negative in mesotrophic and positive in oligotrophic lakes.
Zooplankton nutrient recycling appears to outweigh grazing pressure in nutrient-limited systems.
Observed dynamics suggest trophic control is influenced by abiotic conditions and seasonal changes.

Key Insights:

Trophic control is not constant but fluctuates with environmental factors.
Seasonal reset hypothesis supported: interactions strongest at the growing season's onset.
Nutrient availability significantly modulates the direction and strength of top-down control.

Outlook:

Understanding large-scale, long-term ecological dynamics is crucial for effective ecosystem management.
Further research should explore how climate change impacts these seasonally-driven trophic interactions.
Long-term monitoring and advanced modeling are essential for predicting ecosystem responses to global change.