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Unit 2: Ecology
Lesson #3: Sampling Techniques
Please take out your composition notebook
“No Bags About It”
Objective: Explain how ecologists use mark and recapture to estimate
population size.
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I. Sampling Techniques NotesA. Ecologists study relationships
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B. Ecological research methods include observation, and experimentation.
1. Observation is the act of carefully watching something over time.
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2. Experiments a. Lab Experiments: more control,
but are not reflective of the complex interactions in nature.
b. Field experiments: more accurate, but cannot be manipulated to test certain variables.
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C. Sampling Techniques1. Mark-and-Recapture
a. Used to estimate the size of a population.
b. Capturing individuals, tag, release.c. Can be captured again.
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2. Quadrant Sampling: a. Place a quadrant in an areab. Count the population several areas,
then calculate the total population.
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3. Core Samplinga. obtained by drilling into
sediment, trees, or ice.b. Used to infer the history of
area.