Lecture 6 - Lecture6[8/30/10]...

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Lecture 6 [8/30/10] Extra credit- Imagine yourself as part of the food web, sketch the food web. Question-  how many trophic levels are there in this web? Explain your answer. Hand in your  sketches and answers Wednesday September 8. Make sure it has name.  Human Impact on Populations People can induce both increases and decreases in population  Eutrophication- nutrient overload Table 3-2  People cause population decreases by imposing new limitations Table 3-3 A community consists of…. All the populations that inhabit a certain area Community analysis is “structural” because it emphasizes the distribution  of organisms through space and time - Open and closed communities - Community succession Community Structure
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Most communities are open because of the overlapping ranges of their  component populations
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Lecture 6 - Lecture6[8/30/10]...

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