Download - Interactions Among Living Organisms
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Interactions Among Living
OrganismsPage 539-549Chapter 18
Section 2 & 3
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Identify the characteristics that describe
populations.
Examine the different types of relationships that occur among populations in a community.
Determine the habitat and niches of a species in a community.
Objectives for Section 2
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Population Size
Number of individuals in the population Difficult to measure
Small populations that are made up of organisms that do not move are determined by counting the individuals.
Usually individuals are too widespread or move around too much to be counted.
Characteristics of Populations
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What does this graph tell
us?
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Change in population size due to-
Older mice die Mice are born Mice eaten by predators Some mice move away
Is this a fast changing population size or slow?
What happens if you observe Field Mice in a pasture for
several months?
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What have you noticed about the Pine Trees
here in Kentucky over the last several years? Has this effect been fast or slow?
How can Pine Tree population be effected more quickly? Forest Fire? Disease? Logging?
Pine Trees in a Mature Forest
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The number of individuals in a population that
occupy a definite area
Example: 100 mice live in an area of 1 square kilometer,
the population density is 100 mice per square kilometer.
Population Density
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Population Density
Map
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How the organisms are arranged in a given
area Can be:
Evenly spaced Consistent distance between them
Randomly spaced Wind or birds dispersing seeds
Clumped together Resources such as food or living space are clumped Results when animals gather in groups or plants
grow near each other in groups
Population Spacing
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Population Spacing
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What are the five limiting factors from the
video below?
http://www.youtube.com/watch?v=CuwrZUTeEqM
Limiting Factors
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Any abiotic or biotic factor that limits the number of
individuals in a population A limiting factor can affect other populations in the
community indirectly: Example:
A drought might reduce the number of seed-producing plants in a forest clearing. Fewer plants means that food can become limiting factor for deer that eat the plants and for a bird population that feeds on the seeds of these plants. Food also could become a limiting factor for animals that feed on the birds.
Limiting Factors
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Lets go outside!!!!
Limiting Factor Example
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Get out worksheet:
Key Terms Interactions of Living Things
Bell Ringer 1-10-13
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Open Book to Pages 541-543
Each group is responsible for the section they are assigned. Include Key Term Definition Explanation of the section must be presented
to class, so they can put in their notes!
Group Presentations