Sampling%20and%20Population%20Studies

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Sampling and Population Studies
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Why Sampling and Population Studies are Done...
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• To Monitor the Health of an Ecosystem

Christmas bird counts and the bird atlas
Frog mutations
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Freshwater Macro-invertebrate count
Looking at stream quality
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• Endangered Species

Brown pelicans
osprey
Bald eagles
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• Water rights in the Owens Valley (DWP)

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• Draw up Political Boundaries and Dispute money

The United States Census
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• Establish Hunting and Fishing Limits

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• Determine the Effectiveness of Experimental Drugs

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To Look at the Television Viewing Habits of
Americans
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• Monitor the Effect of Nature on an Ecosystem

Volcanoes
Hurricanes
Global Warming
EL Nino
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• To Track Subtle changes that may have been
  brought about by humans

Integrated pest management
Reintroduction of animals into National Parks
Determine the effectiveness of genetically
engineered crops
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• Because its interesting and fun, and you dont
  always know what the data will reveal!!!

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Key concepts
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1.Sampling is done because counting all of the
stars, bacteria, people etc, is too cumbersome or
just plain impossible.
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2. The sampling must be done randomly.
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2. The sampling technique assumes that the
population is distributed evenly (statistically)
throughout the area of study.
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3. The data is interpreted and analyzed knowing
the limitations presented earlier.
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The Study must be conducted over a long period of
time...
because populations fluctuate from year to year.
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Modeling Population Studies in the Classroom
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I. The Grid Method
II. Transect-Line Method
III. Tag and Recapture Method
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The Grid Method
Predator/Prey Relationships
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The Daily Newspaper serves as a Hypothetical
Forest
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Our Hypothetical Forest is full of Predators
(Owls) and Prey (Voles)
The Letter E
The Letter L
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By using different parts of the newspaper, we can
increase and decrease the amounts of predator and
prey in our forest for any given year...
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Then we divide the forest into a 10 inch by 10
inch grid
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Students then count only those squares that have
been randomly selected
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Plotting the Graph and Analyzing the Data
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Population Studies are an important part of our
science curriculum involving many different
skills
1. Data Collection and Analysis
2. Mathematics including statistics and
proportions
3. Graphing
4. Cooperative learning