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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.

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.

Ecological Succession

Ecological Succession

Ecological succession is influenced by the processes of facilitation, inhibition, and toleration. Facilitation occurs when early successional species create more favorable ecological conditions for subsequent species, such as enhanced nutrient, water, or light availability. In contrast, inhibition happens when early successional species create unfavorable ecological conditions for potential successive species, such as limiting resource availability. In some cases, later successional species...

Introduction to Plant Diversity

Introduction to Plant Diversity

From Water to Land

Predicting Reaction Outcomes

Predicting Reaction Outcomes

Kinetics describes the rate and path by which a reaction occurs. In contrast, thermodynamics deals with state functions and describes the properties, behavior, and components of a system. It is not concerned with the path taken by the process and cannot address the rate at which a reaction occurs. Although it does provide information about what can happen during a reaction process, it does not describe the detailed steps of what appears on an atomic or a molecular level. On the other hand,...

Production Efficiency

Production Efficiency

Net production efficiency (NPE) is the efficiency at which organisms assimilate energy into biomass for the next trophic level. Due to low metabolic rates and less energy spent on thermoregulatory processes, the NPE of ectotherms (cold-blooded animals) is 10 times higher than endotherms (warm-blooded animals).

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Related Experiment Video

Updated: Aug 28, 2025

A Low-Cost Method of Measuring the In Situ Primary Productivity of Periphyton Communities of Lentic Waters

A Low-Cost Method of Measuring the In Situ Primary Productivity of Periphyton Communities of Lentic Waters

Published on: December 16, 2022

Predicting ecosystem productivity based on plant community traits.

Nianpeng He¹, Pu Yan², Congcong Liu³

¹Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China; Center for Ecological Research, Northeast Forestry University, Harbin 150040, China.

Trends in Plant Science

|September 17, 2022

Summary

Integrating community traits and environmental data is key for predicting ecosystem productivity at landscape scales. This approach enhances ecological models for understanding ecosystem functions and predicting responses to global change.

Keywords:

big-leaf model emergentism macroecology plant community traits primary productivity resource acquisition efficiencies scale transition

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Area of Science:

Ecology
Ecosystem Science
Plant Ecology

Background:

Plant trait data are rapidly accumulating, offering opportunities for ecosystem productivity prediction.
Scaling plant traits from cellular to ecosystem levels for productivity prediction remains a challenge.

Purpose of the Study:

To demonstrate the necessity of combining community traits and environmental factors for predicting ecosystem productivity.
To extend the production ecology equation for integrating traits into ecosystem function models.

Main Methods:

Analysis of community-level plant traits.
Integration of environmental factors.
Extension of the production ecology equation.

Main Results:

Community traits combined with environmental factors effectively predict ecosystem productivity at landscape and biogeographic scales.
The extended production ecology equation provides a framework for trait integration.

Conclusions:

Combining community traits and environmental data is crucial for accurate ecosystem productivity prediction.
This integrated approach enhances ecological models for predicting ecosystem functions and responses to global change.