Adaptation

Adaptation: Definition and Purpose

• Adaptation: physical or behavioral traits that help an organism survive in its environment.
• Purpose: to cope with the environment and increase survival chances.

Types of Adaptations

• Structural adaptations: changes in body parts, color, shape.
• Behavioral adaptations: actions/strategies to survive (e.g., migration, hibernation, aestivation).

Desert Habitat Adaptations

• Desert plants:
  • Leaves modified as thorns to reduce water loss.
  • Stem enlarged to store water.
• Desert animals:
  • Camel: long legs to stay away from hot sand; hump stores fat; drinks large amounts of water at once.
  • Some animals/insects aestivate during the day to escape heat.
  • Water obtained from food.
• Habitat: Desert.

Aquatic Adaptations

• Aquatic plants:
  • Stems long, narrow, and flexible to withstand water currents.
  • Floating leaves large and flat.
• Aquatic animals:
  • Streamlined bodies for swimming.
  • Gills for underwater respiration.
  • Fins and tails to swim.
  • Air bladder for buoyancy and floating.
• Birds: ducks have webbed feet for swimming.

Polar/Arctic Adaptations

• Polar bear:
  • Thick fur and a fat layer under the skin for insulation.
  • Hibernation during colder months.
• Yak:
  • Long and thick coat for warmth.
  • Strong hooves to break ice and graze.

Seasonal Camouflage: Snowshoe Hare

• Fur color changes with seasons to camouflage and reduce predation.

Snowy/Cold Habitat Summary

• Plants: smaller leaves and insulating layers to reduce water/heat loss.
• Animals: polar bears with thick fur and fat; yaks with thick coats.

Changes in Body Parts vs Behavior

• Structural adaptations: changes in body parts (skin, color, shape).
  • Examples: blubber of a whale, beak of a woodpecker, baleen of a humpback whale.
• Behavioral adaptations: changes in behavior (migration, hibernation, aestivation).

Hibernation

• Hibernation: the condition or period of an animal spending winter in a dormant state; long sleep to avoid extreme cold.

Aestivation

• Aestivation: a period of deep and prolonged sleep during hot/dry season to escape heat.

Migration

• Migration: seasonal movement of animals from one region to another in response to temperature, food availability, and breeding.

Quick Recall

• Key concepts: adaptation, structural vs behavioral adaptations.
• Examples to recall: polar bear, camel, cactus, snowshoe hare, duck, yak.