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From Wikipedia, the free encyclopedia. Stream metabolism, also known as aquatic ecosystem metabolism in lakes, can be expressed as net ecosystem productivity (NEP), the difference between gross primary productivity (GPP) and ecosystem respiration (ER).
Merge this question into. Split and merge into it. Answer by Karthick kannan. Confidence votes 1. ecosystem is a smaller unit of earth,all ecosystems together form earth.the food webs to gether form a ecosystem.erge this question into. Split and merge into it. Answer by Karthick kannan. Confidence votes 1. ecosystem is a smaller unit of earth,all ecosystems together form earth.the food webs to gether form a ecosystem.