What factors influence ecosystems


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Biotic and abiotic factors

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What factors influence ecosystems

  1. 1. What factorsaffectecosystems?
  2. 2. Do plants and animalsneed each other to survive?Yes
  3. 3. Plants and animalsLiving parts of the ecosystemThe living parts are calledBIOTIC FACTORS
  4. 4. Biotic factors affect:The ecosystem One anotherPlants helpanimalsAnimalshelp plantsAnimalsand plantsharm oneanother
  5. 5. Plants help animals1) Provide food for caterpillars,sheep, other animals and people.
  6. 6. 2) Provide shelter for animals.Example: Insects live in grassesSquirrels live in trees.
  7. 7. Animals helps plants1) Animals eat one kind of plant,so, that plant does not spread.(Other plants have space to grow)
  8. 8. 2) Animal droppings make the soilricher.3) Earthworms help loosen soil.(Rich, loose soil help plants grow)
  9. 9. Animals and plants harmone another.1) Hungry deer can eat enoughleaves to kill a tree.
  10. 10. 2) Swarm of locusts can leave afield without any plants.
  11. 11. 3) Gypsy moth caterpillars can eatall the leaves on a tree.
  12. 12. 1) Wolves eat rabbits.If the wolf population becomes toolarge what would happen to therabbits?They can eat all the rabbits.Animals affect one another
  13. 13. What would happen to the wolvesif there were no more rabbits?The wolves would go hungry andmight even die.
  14. 14. What would happen to the grass inthat area without the rabbits toeat them?The grass would spread.
  15. 15. A new kind of plant or animal canchange an ecosystem.Example: People brought skunkvine to the United States from AsiaIt was planted as a crop, but, now itgrows wild.
  16. 16. Sunlight, air, water, soil andclimateNon-Living parts of theecosystemThe non- living parts arecalled ABIOTIC FACTORS
  17. 17. Abiotic factors affect theecosystem.Example:1) WaterLittle rainPlants dieSome animals die, some find otherhomes
  18. 18. 2) SoilRich soil More plants growPoor soil Less plants grow3) Sunlight
  19. 19. Climate affects ecosystems
  20. 20. Rain forests1) Near the equator.2) Warm and rainy all the year.3) Has half of all kinds of plants onearth.
  21. 21. Deserts1) No or very little rain.2) Most desert animals hide duringthe day and come out to huntfor food at night.
  22. 22. Deciduous forests1) Have four seasons.2) Trees such as oaks and mapleslose their leaves in the fall (Helpthem survive in cold winters).
  23. 23. Savana1) Temperature stays same all theyear (between 18˚c and 22˚c)
  24. 24. Taiga1) Covers more of the earth thanany other community.2) Very cold in winter.3) Most of its trees are evergreens.
  25. 25. Tundra1) Coldest climate (-40˚c to 18˚c)2) Tundra means “treeless plain”.
  26. 26. DiversityThe number of differentkinds of living things.
  27. 27. Forest floorUnderstoryCanopy