1 Adaptations. 2 What is Adaptation? “...the way in which a species becomes better suited to...
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Transcript of 1 Adaptations. 2 What is Adaptation? “...the way in which a species becomes better suited to...
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Adaptations
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What is Adaptation? “...the way in which a species becomes
better suited to living in its environment.”
structures, characteristics, and behaviors that increase an organisms’ chance of surviving and reproducing in an environment.
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Structural adaptations are physical characteristics that help the organism survive (keep warm or cold, feed, communicate, move, etc.).
Ex: Thick layer of blubber of a polar bear is used to keep it warm in the artic temperatures
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Movement
• Many methods: running, flying, swimming, etc.• Different habitats present different problems to
movement that need to be overcome• Specialists vs. Generalists
...cumbersome on landGood in water...
Leopard seal – aquatic specialist
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Why move?
Radiated tortoises mating
American pika collecting food Common warthog fleeing from cheetah
Grass snake hatchlings dispersing
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• Things to think about: • Speed vs. agility (mode of feeding dictates movement) :
– Move to catch prey or to escape predators– Land may be open or have obstacles such as trees
• Moving over different substrates e.g. sand, snow, mud
(What does it feel like when you run in sand?)
Adaptations to moving on land
Movement on Land
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• Meter long tail used for balance when walking across rocky cliffs
• Short fore limbs and long hind limbs for agility in steep rugged habitat.
Snow Leopard
Adaptations for living in trees
Things to think about:
• Forested areas may not be continuous• Moving from one tree to another :swinging, jumping, gliding • Balance and grip (falling could be fatal)
Arboreal Movement
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Sugar glider
• Patagium (flaps on side of body) allow it to glide up to 50 meters
• Tail used to control direction when gliding, grasp tree when sitting• Feet are hand-like to grasp branches
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Adaptations to aquatic movement
• Things to think about:
• Friction – causing drag• Buoyancy – saline (salt) vs. freshwater• Currents and tides
Aquatic Movement
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Great white shark
• Streamlined body to reduce drag
• Fins and tail used to propel/direct itself through water• No swim bladder, liver contains squalene which maintains constant buoyancy
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Spotted handfish
• Two different methods of moving through water a. fins for swimming or walking along sea floor
•Color allows it to blend into surroundings
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Adaptations to aerial movement
• Things to think about:
• Overcoming friction• Use of air currents• Hot air vs. cold air
Aerial Movement
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Peregrine falcon
Fastest flying bird 155 miles/hour• Tear drop body shape makes it aerodynamic• Nostrils with baffles (small cones) that slow down air
entering lungs so they do not explode
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Behavioral adaptations are actions that are used by an organisms to help it survive.
Ex: Birds migrating south during the winter
Why? When fall turns to winter, temperature dips, food sources become scarce Birds move to locations where there is a constant food supply and nesting opportunities.
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Sea otters wind themselves up in the tops of kelp. Young otters must learn this behavior from older otters.
Why? Prevents them from being swept away from their ecosystem by the tide.
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What occurs?oheartbeat drops from 55 beats/min to 10 beats/min
obody temperature drops 5-9 degrees below normal
oWhile in hibernation the bear uses stored energy it accumulated as fat to survive. A bear can lose 15 to 40 percent of its body weight during the winter just by sleeping!
Why?When fall turns to winter,temperature dips, food sourcesbecome scarce
Bear Hibernating
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• Fossa
• Habitat generalist – can move quickly through trees as well as on the ground
• Adapted to jump between branches
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Rainforest
Open grassland
Woodland
River
Ocean
Desert
Polar Which habitat?Mountains
Snow leopard
Nile crocodile
Bornean orangutan
Red squirrel
- You will be given an ‘Adaptations for Movement’ worksheet.
- Write in the adaptations that each species has for moving through its natural habitat.
Once you have finished the worksheet, you can begin your ‘Wild Journey’
• Get into groups of 5 or less
• Each group will need:
• 1x Wild Journey board game
• 5x Species characters - use as your playing pieces on the board
• 5x Species fact files - explains how your particular species is
adapted to moving through its natural habitat
• 1x Rules sheet - read before beginning the game
Wild Journey
SpeciesHabitat
Natural Least suitable
Cheetah African savannah Polar
White-handed gibbon Rainforest African savannah
Polar bear Polar Rainforest
Sidewinder Desert Rocky cliffs
Spanish ibex Rocky cliffs Desert
• If you land on your natural habitat square: roll the dice again.
• If you land on your least suitable habitat square: miss a go!