Transcript
What factors determine the rate at which a
population can increase in size?
Reproductive PotentialReproductive Potential
What might happen to the populations of walkingsticks and birds in the bush environment over
time?
Limiting FactorsLimiting Factors• Besides predation by birds,
what other factors might limit the walkingstick population?
• Are these factors biotic or abiotic?
Migrating Birds
Webbed Feet
Swimming Upstream
Long Legs
Nocturnal Hunting
How would you describe these organisms?
FEATURE• Any general
structure, characteristic, or behavior of an organism– Wings, fur, pattern,
color and migration– ALL have this
TRAIT• The specific
expression of a feature in an individual– Wing length, number
of spots, thickness of fur, intensity of color, timing of migration
– SOME have this
VARIATION• When there are several traits for the
same feature in a population– One example are the 3 different colors
exhibited by walking sticks
• Allows a population to survive even if the environment changes
Reflection page 68Draw and color an illustration
of an organism or organisms and identify the feature,
trait and variation included in your picture.
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