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How Ecosystems Work Part II
Nutrient Cycling & Change in Ecosystems
Carbon Cycle
• The process by which carbon is cycled between the atmosphere, land water, and organisms.
• Plants convert atmospheric CO2 into carbohydrates during photosynthesis and release CO2 during cellular respiration.– Ex: Elodea
http://mn-media-cluster-1.discoveryeducation.com/videos/1/Zeus_Animations/Carbon-Cycle_07-28_Fixed.swf
CARBON CYCLE
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.
http://mn-media-cluster-1.discoveryeducation.com/videos/1/Zeus_Animations/Nitrogen-Cycle_07-28_Fixed.swf
Nitrogen Cycle
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.
Phosphorus Cycle
Ecological Succession
• 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.
What Type of Succession?
1st Year 2nd Year 3rd Year
What Type of Succession?
Climax Community
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