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What factors influence ecosystems
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What factors influence ecosystems

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Biotic and abiotic factors

Biotic and abiotic factors

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    What factors influence ecosystems What factors influence ecosystems Presentation Transcript

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