Summary
The rate at which producers convert energy into organic matter, gross minus respiration equals net.
In depth
GPP is total energy fixed; NPP = GPP - respiration, and is the energy available to consumers. Tropical rainforests and estuaries are highly productive; open oceans, though low per area, contribute greatly by area. NPP is measured by biomass change, CO2 uptake or satellite data.
Productivity is limited by light, water, temperature and nutrients. In the oceans, nitrogen, phosphorus or iron may be limiting. NPP can be mapped globally from satellites.
Remember: NPP = GPP minus respiration of producers.
Frequently asked questions
What is Primary Productivity?
The rate at which producers convert energy into organic matter, gross minus respiration equals net.
Which area of biology covers Primary Productivity, and how advanced is it?
Primary Productivity is one of the 54 topics in Ecology. It is rated Intermediate, so it suits learners who already know the core vocabulary. Related topics in this area include Producers, Ecosystem, Trophic Levels.
Can you give an example of Primary Productivity?
The Amazon basin produces about 10 percent of global terrestrial NPP.
What should I learn before Primary Productivity?
Work through the Beginner topics in Ecology first, such as Ecology, Ecosystem, Biotic and Abiotic Factors, then return to Primary Productivity. Intermediate topics assume the Beginner vocabulary.
What topics are related to Primary Productivity?
The closest topics to Primary Productivity are Producers, Ecosystem, Trophic Levels, Consumers. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Primary Productivity?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Primary Productivity. To practise the whole of Ecology, use the Ecology quiz.
How is Primary Productivity different from Producers?
Primary Productivity: The rate at which producers convert energy into organic matter, gross minus respiration equals net. Producers: Autotrophs such as plants and algae that make organic compounds from light or chemical energy. Read both side by side and note what each one explains.
How should I study Primary Productivity step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Producers and explain the difference aloud. Finally, take the Ecology quiz and come back to this page for any question you miss.