Vocabulary

1
Vocabulary

• Ecosystem
• Community
• Population
• Habitat
• Niche (Ecological Niche)

2
Relationship Notebook Quiz

1. What is the struggle between individual or
   different populations for a limited resource?
2. What is the relationship between individuals of
   two different species who live together in a
   close relationship?
3. What is the relationship between two species that
   both benefit from the interaction?
4. What is the relationship that a tick has with a
   deer?
5. In the example of a fox and a rabbit which is the
   predator?

3
Population Spacing
Describes how individuals arrange themselves
within a population.
4
Growth, Stability and Decline
5
Population Size
The number of individuals in a population at a
given time.
Methods of determining population size

• Direct Observation
• Indirect Observation
• Sampling
• Mark and Recapture Studies

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Direct Observation
Counting one by one to determine the population.
Christmas Island Crabs
7
Indirect Observation
Observe signs of organisms rather than the
organisms themselves.
Cliff Swallows
8
Sampling
Count the number of organisms in a small area and
then multiply to find the number in the larger
area.
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10
Mark and Recapture Study
Total Population marked x recaptured
recaptured with marks
Sea Turtles