1. Behavioral Cycles
1. Behavioral Cycles
Many animals respond to periodic changes in the environment with daily or seasonal cycles of behavior.
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2. Synchronized w/ rising and setting of the sun
Daily Cycles
2. Daily Cycles
Behavioral cycles that occur in daily patterns are called circadian rhythms.
Synchronized w/ rising and setting of the sun
Circa Diem = approximately a day
Regulated by the hypothalamus in the brain
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3. # ______ regular robins?
Daily Cycles
Pair and Share! What is your preferred circadian rhythm, your personal pattern for sleeping and being awake? _____________________________________
4. Class Poll!
# ______ early birds?
# ______ night owls?
# ______ regular robins?
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4. Common Circadian Cycles
Daily Cycles
Common Circadian Cycles
5. Diurnal
6. Nocturnal
7. Crepuscular
ninght
Awake during day
night
Sleep during day
Primarily active
@ dawn & dusk
Illustration:
Examples:
Catoon:

5. Many animals respond to seasonal changes.
Seasonal Cycles
Seasonal Cycles
Many animals respond to seasonal changes.
migration -> a geographic movement cycle
dormancy -> a bodily function cycle
9. Both are synchronized with the seasons of the earth.

6. Seasonal Cycles
migration = periodic movement from one place to another and back again.
Examples:
Green Sea Turtle
December  June
Feeding grounds
along the coast of
Brazil to Ascension Island
Mating and nesting
Sockeye Salmon

7. Unusual or extreme weather conditions Habitat destruction/ change
Seasonal Cycles
12. Monarch Migration
300 million
2000 miles
NA to Mexico
What types of environmental conditions could endanger the Monarch butterflies?
Unusual or extreme weather conditions
Habitat destruction/ change

8. How can migration increase an organism’s biological fitness?
Seasonal Cycles
How can migration increase an organism’s biological fitness?
Increased access to food sources
Decreased exposure to predators
Better temperature control

9. Seasonal Cycles
Dormancy = a period in an organism's life cycle when growth, development, and physical activity are temporarily stopped.
Several species are active during warm seasons but enter into dormancy during cold seasons.

10. Hibernation (mammals) Animals build up fat
Seasonal Cycles
17. Types of Dormancy:
Hibernation (mammals)
Animals build up fat
Metabolism slows down – heart can slow down by up to 95%
Brumation (reptiles)
Metabolism slows down, don’t eat
However, they need to drink water
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11. Hibernation Example: Polar Bears
Seasonal Cycles
Hibernation Example: Polar Bears
Listen for key points. Create a bullet list:

12. What kinds of stimuli can trigger a dormancy response?
Seasonal Cycles
What kinds of stimuli can trigger a dormancy response?
Lowered temperatures
Shorter days
20. How could dormancy increase an animal’s biological fitness?
It allows an animal to survive periods when food and other resources may not be available.