---
title: "Secondary Production | Intro to Environmental Science"
description: "Secondary production is biomass made by consumers from eaten organic matter, showing how energy moves through food webs in Intro to Environmental Science."
canonical: "https://fiveable.me/introduction-environmental-science/key-terms/secondary-production"
type: "key-term"
subject: "Intro to Environmental Science"
unit: "Unit 3"
---

# Secondary Production | Intro to Environmental Science

## Definition

Secondary production is the biomass made by heterotrophs, like animals and microbes, when they turn food into new body tissue. In Intro to Environmental Science, it shows how energy moves from producers into the rest of the food web.

## What It Is

Secondary production is the amount of new biomass made by heterotrophs, usually consumers and decomposers, after they eat organic matter. In Intro to Environmental Science, that means the energy stored in plants, algae, or dead material gets converted into animal tissue, microbial growth, or other living biomass.

This is not the same as making food from sunlight. Primary producers capture energy first through photosynthesis or other energy-capturing processes, and secondary production comes after that. A deer growing muscle from grasses, or bacteria building new cells from dead leaves, are both examples of secondary production.

The term is about biomass increase, not just eating. An animal can consume a lot of food, but only part of that becomes new body mass. The rest is lost through respiration, movement, heat, and waste. That is why energy transfer between trophic levels is inefficient, and why less energy is available higher up the food chain.

You can think of secondary production as the ecosystem's conversion step. It shows how much of the energy captured by primary production is actually turned into consumer tissue. That makes it a useful way to compare ecosystems, because a nutrient-rich meadow, a forest, and a lake can all support different rates of consumer growth depending on food availability, temperature, and organism metabolism.

Secondary production also connects to decomposition. Microbes and detritivores may get energy from dead organic matter instead of living plants, but they are still turning that material into biomass. In class, this often comes up when you trace where matter goes after organisms eat, excrete, or die, and how that material keeps moving through the ecosystem.

## Why It Matters

Secondary production is the step that shows whether energy captured by producers actually becomes usable biomass for the rest of the food web. If you only look at primary production, you see how much energy enters the system, but secondary production shows how much of that energy is built into herbivores, predators, and decomposers.

This term also helps explain why food webs narrow at higher trophic levels. Most energy is lost between levels, so secondary production is always lower than the biomass or energy made by producers. That is why large predator populations need a lot of primary production below them.

In Intro to Environmental Science, you may use this idea when discussing ecosystem productivity, population changes, or the effects of temperature and food supply on living things. It also connects to nutrient cycling, because when consumers grow, excrete waste, or die, their biomass feeds the next round of decomposition and recycling. If a system has low secondary production, it often means less energy is being turned into animal growth and less support exists for higher trophic levels.

## Connections

### [primary production](/introduction-environmental-science/key-terms/primary-production)

Primary production is the starting point for most food webs, because producers make biomass from sunlight or chemical energy. Secondary production depends on that earlier step, since consumers can only build new tissue from organic matter that already exists. When you compare the two, you are looking at energy entry versus energy conversion inside the ecosystem.

### trophic levels

Secondary production changes as energy moves through trophic levels. Producers sit at the base, herbivores and other consumers come next, and each step upward receives less available energy. That is why food chains get shorter near the top and why high-level consumers are usually fewer in number.

### decomposition

Decomposition also involves secondary production, because decomposers use dead organic matter and turn part of it into microbial biomass. The rest is broken down and recycled back into the environment. This connection shows that energy flow and nutrient cycling are linked, even though energy leaves the ecosystem as heat while matter is reused.

### [biomass pyramid](/introduction-environmental-science/key-terms/biomass-pyramid)

A biomass pyramid can help you visualize secondary production because it shows how much living material exists at each trophic level. When secondary production is low, upper levels of the pyramid stay small. The shape of the pyramid reflects how efficiently energy from producers is converted into consumer biomass.

## On the AP Exam

A quiz question might ask you to label which part of a food web represents secondary production or explain why consumer biomass is smaller than producer biomass. In a short response, you may need to trace energy from plants to herbivores and then describe what happens to the part that is not stored as new growth. If you get a graph or pyramid, look for the amount of biomass added by consumers over time, not just the number of organisms. For case questions, connect low secondary production to limited food supply, cold temperatures, or high metabolic losses. The safest move is to separate biomass made by producers from biomass made by consumers and explain the transfer between them.

## Key Takeaways

- Secondary production is the biomass made by consumers and other heterotrophs after they eat organic matter.
- It measures how much producer energy is turned into new consumer tissue, not just how much food gets eaten.
- Secondary production is always limited by primary production, because consumers depend on biomass that already exists.
- Most energy is lost as heat, waste, and respiration, so less biomass appears at higher trophic levels.
- It connects energy flow to nutrient cycling because consumer biomass eventually returns to the ecosystem through waste and decomposition.

## FAQs

### What is secondary production in Intro to Environmental Science?

It is the creation of new biomass by heterotrophs, like animals and microbes, after they consume organic matter. In an ecosystem, it shows how energy captured by producers gets converted into consumer tissue. It is one way scientists track energy flow through food webs.

### How is secondary production different from primary production?

Primary production makes biomass from sunlight or inorganic energy sources, usually by plants, algae, and some bacteria. Secondary production happens later, when consumers and decomposers turn food into their own biomass. One starts the food web, the other moves energy through it.

### Does eating count as secondary production?

Not by itself. Eating is consumption, but secondary production only counts the part of that food that becomes new body mass. If an animal eats a lot but uses most of it for respiration or activity, its secondary production is still low.

### Why is secondary production usually lower at higher trophic levels?

Energy is lost at each step through metabolism, heat, and waste, so less is available to build new biomass. That is why top predators need a large base of primary production underneath them. This is one reason ecological pyramids usually narrow as you move upward.

## Related Study Guides

- [3.2 Energy Flow and Nutrient Cycling](/introduction-environmental-science/unit-3/energy-flow-nutrient-cycling/study-guide/ZtX9vUxqtlMUhkih)

## About This Document

Canonical Fiveable pages are available as Markdown at the same path plus `.md`.

- [llms.txt](https://fiveable.me/llms.txt): index of Fiveable's sections and URL patterns
- [llms-full.txt](https://fiveable.me/llms-full.txt): complete subject and unit listing
- [MCP server](https://fiveable.me/mcp): call Fiveable as tools instead of fetching pages (`https://fiveable.me/api/mcp`)
- [MCP server for AP teachers](https://fiveable.me/mcp/teachers): a teacher's classes, assignments and AP-rubric grading (`https://fiveable.me/api/mcp/teacher`)

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