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Segment from the program How Ecosystems Work: Energy Flows and Nutrient Cycles.

DVD description
Looks at the processes that are fundamental to all ecosystems. First, the concepts of primary productivity, trophic levels, food chains, energy pyramids and the flow of energy through ecosystems are introduced. The program then explains how carbon, nitrogen, phosphorus and water cycle through ecosystems and how human activities can disrupt and unbalance these cycles, leading to accelerated eutrophication in lakes in the event of phosphorus imbalances and global warming in the case of carbon imbalances. .

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