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How Ecosystems Work Part II Nutrient Cycling & Change in Ecosystems.

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Presentation on theme: "How Ecosystems Work Part II Nutrient Cycling & Change in Ecosystems."— Presentation transcript:

1 How Ecosystems Work Part II Nutrient Cycling & Change in Ecosystems

2 Carbon Cycle The process by which carbon is cycled between the atmosphere, land water, and organisms. Plants convert atmospheric CO 2 into carbohydrates during photosynthesis and release CO 2 during cellular respiration. – Ex: Elodea

3 CARBON CYCLE

4 Nitrogen Cycle A process in which nitrogen is cycled between the atmosphere, bacteria, and other organisms. – Nitrogen-fixing bacteria are bacteria that live in plant roots and convert atmospheric nitrogen into ammonia.

5 Nitrogen Cycle

6 Phosphorus Cycle The movement of phosphorus from the environment to organisms and then back to the environment. (P) rock deposits land living organisms ocean Rarely occurs because phosphorus as a gas rarely occurs as a gas.

7 Phosphorus Cycle

8 Ecological Succession – A gradual process of change and replacement of the types of species in a community. Primary Succession – Occurs on a surface where no ecosystem existed before. Secondary Succession – Occurs on a surface where an ecosystem has previously existed. – Ex: Volcanoes – Pioneer Species - colonizes an uninhabited area and that starts an ecological cycle. Climax Community – The final, stable community in equilibrium with the environment.

9 What Type of Succession? 1 st Year2 nd Year3 rd Year

10 What Type of Succession?

11 Climax Community


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