Ecology & Environmental Problems Dr. Ron Chesser Lecture #14: Ecosystems and Ecosystems Management Reading: Chapter 6.

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Presentation transcript:

Ecology & Environmental Problems Dr. Ron Chesser Lecture #14: Ecosystems and Ecosystems Management Reading: Chapter 6

What is an Ecosystem? The minimal collection of features that will support and sustain life.

Food Webs Example of a Food WebExample

Energy Flow and Food Webs A pond Ecosystem

Arctic Food Web

The Energy Pyramid in Ecosystems kcal/m 2 /year

Biomass Pyramid in Ecosystems

Pyramid of Numbers in an Ecosystem

Trophic Levels All organisms in a food web that are the same number of feeding levels away from the original source of energy (usually the sun).

Decomposers Fungi play an important role in the decomposition process converting organic matter back into basic inorganic chemicals.

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