34 2 Patterns of Behavioral Cycles 1 Behavioral
34 -2 Patterns of Behavioral Cycles 1. Behavioral Cycles Many animals respond to periodic changes in the environment with daily or seasonal cycles of behavior.
34 -2 Patterns of Behavior Daily Cycles 2. Daily Cycles Behavioral cycles that occur in daily patterns are called circadian rhythms. http: //www. youtube. com/watch? v=Ub. Q 0 Rx. Qu 2 g. M • Synchronized w/ rising and setting of the sun • Circa Diem = approximately a day • Regulated by the hypothalamus in the brain
34 -2 Patterns of Behavior Daily Cycles 3. 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?
34 -2 Patterns of Behavior Daily Cycles Common Circadian Cycles 5. Diurnal 6. Nocturnal 7. Crepuscular Sleep @ ninght Awake during day Awake @ night Sleep during day Primarily active @ dawn & dusk Illustration: Examples: http: //www. youtube. com/watch? v=w 0 ffw. DYo 00 Q
34 -2 Patterns of Behavior Seasonal Cycles 8. 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.
34 -2 Patterns of Behavior Seasonal Cycles 10. 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 http: //video. nationalgeographic. com/video/animals/fish-animals/bonyfish/salmon_sockeye/
34 -2 Patterns of Behavior Seasonal Cycles 12. Monarch Migration http: //video. nationalgeographic. com/video/kids/animals-petskids/bugs-kids/monarch-butterflies-kids/ • 300 million • 2000 miles • NA to Mexico 13. What types of environmental conditions could endanger the Monarch butterflies? • Unusual or extreme weather conditions • Habitat destruction/ change
34 -2 Patterns of Behavior Seasonal Cycles 14. How can migration increase an organism’s biological fitness? • Increased access to food sources • Decreased exposure to predators • Better temperature control
34 -2 Patterns of Behavior Seasonal Cycles 15. Dormancy = a period in an organism's life cycle when growth, development, and physical activity are temporarily stopped. 15. Several species are active during warm seasons but enter into dormancy during cold seasons.
34 -2 Patterns of Behavior 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
34 -2 Patterns of Behavior Seasonal Cycles 18. Hibernation Example: Polar Bears http: //www. animalplanet. com/tv-shows/animal-planet-presents/videos/natural-world-bear-hibernation. htm Listen for key points. Create a bullet list: • • •
34 -2 Patterns of Behavior Seasonal Cycles 19. 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.
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