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BEAVER, ELK, and TREES in YELLOWSTONE PARK An Interactive PowerPoint Experiment.

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Presentation on theme: "BEAVER, ELK, and TREES in YELLOWSTONE PARK An Interactive PowerPoint Experiment."— Presentation transcript:

1 BEAVER, ELK, and TREES in YELLOWSTONE PARK An Interactive PowerPoint Experiment

2 Teachers – Before viewing the slide show, right click on the document below. Go to Document Object and select Open. Print out worksheet and have students complete while viewing the PowerPoint.

3 INSTRUCTIONS You will need to take data in order to analyze what is going on and to answer questions at the end of the lesson. Pay attention to what is happening to the population of beaver, aspen, willow, and conifers. As the years go by, mark with a plus (+) if the population increases, and a minus (-), if it decreases.

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5 YEAR 1900 ELK POPULATION: LOW

6 YEAR 1910 ELK POPULATION: LOW

7 YEAR 1920 ELK POPULATION: LOW

8 YEAR 1930 ELK POPULATION: LOW

9 YEAR 1940 ELK POPULATION: LOW

10 YEAR 1950 ELK POPULATION: LOW

11 YEAR 1960 ELK POPULATION: LOW

12 YEAR 1970 ELK POPULATION: LOW

13 YEAR 1900 ELK POPULATION: HIGH

14 YEAR 1910 ELK POPULATION: HIGH

15 YEAR 1920 ELK POPULATION: HIGH

16 YEAR 1930 ELK POPULATION: HIGH

17 YEAR 1940 ELK POPULATION: HIGH

18 YEAR 1950 ELK POPULATION: HIGH

19 YEAR 1960 ELK POPULATION: HIGH

20 YEAR 1970 ELK POPULATION: HIGH

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