Presentation on theme: "How Ecosystems Work Part II Nutrient Cycling & Change in Ecosystems."— Presentation transcript:
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 CO 2 into carbohydrates during photosynthesis and release CO 2 during cellular respiration. – Ex: Elodea http://mn-media-cluster-1.discoveryeducation.com/videos/1/Zeus_Animations/Carbon-Cycle_07-28_Fixed.swf
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
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.
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? 1 st Year2 nd Year3 rd Year