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Ecology
 

Ecology

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intro ecology ocs biology

intro ecology ocs biology

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    Ecology Ecology Presentation Transcript

    • ecology
      ENERGY IN ECOSYSTEMS
    • Ecology
      Ecology is the study of how organisms live and interact in their environment. The term ecology literally means “study of the household” so if you are studying the ecology of fish, you are studying fish neighborhoods!
    • Community and Habitat
      A habitat is a particular place where organisms live. Forests, ponds or coral reefs are all examples of a habitat. Your backyard can be a habitat.
      Theorganismsin the habitat are community members. These organisms are community members of a pond habitat.
    • Community and habitat
      The habitat is like a neighborhood.
      The community is like the people.
    • ECOSYSTEMS
      An Ecosystem is made up of groups of organisms and their physical environment.
      Environment is everything living and nonliving that surrounds an animal.
      Can you name some of the things in this bears environment?
    • ECOSYSTEMS
      Living things depend on each other for energy. Plants get their energy from the sun, some animals get their energy from plants, and others get their energy from other animals.
    • ENERGY IN ECOSYSTEMS
      Most of the energy in an ecosystem comes from the sun. Organisms called producers take in that energy and store it in their cells. You have already studied that process, it is called photosynthesis.
      Producers include plants, some bacteria and algae. See some on the next slide!
    • PRODUCERS
    • ENERGY IN ECOSYSTEMS
      Everything else in an ecosystem is called a consumer. Consumers get their energy by consuming other organisms. They can’t make their own food.
      In an African Grassland habitat, Acacia trees are producers, and giraffes and lions are consumers.
    • CONSUMERS
    • ENERGY IN AN ECOSYSTEM
      There are 3 main groups of consumers:
    • ENERGY IN AN ECOSYSTEM
    • ENERGY IN AN ECOSYSTEM
    • ENERGY IN ECOSYSTEMS
      In every ecosystem there are also some consumers known as decomposers. Decomposers get their energy by consuming wastes (fallen leaves, dead bodies, feces). In an African Grassland habitat, dung beetles and fungi are the decomposers.
    • ENERGY IN AN ECOSYSTEM
      Consumers are sometimes separated into levels.
      First level consumers are animals that eat producers. These are herbivores.
      Second level consumers are either carnivores or omnivores and they eat first level consumers.
      Third level consumers eat second level consumers.
      See the next slide to learn more about the different levels of consumers.
    • 2ND LEVEL CONSUMER
      1ST LEVEL CONSUMERS
      PRODUCERS
    • ECOSYSTEMS
      Can you identify….
      The producer?
      Grasses
      The first level consumer?
      Cricket
      The second level consumer?
      Frog
    • ENERGY IN AN ECOSYSTEM
      Energy flows from the sun to the producers to the consumers. This path is called a FOOD CHAIN
    • In a food chain energy is passed from one animal to another. When an herbivore eats, like a giraffe eating twigs, only some of the energy stored in the leaves is used by the giraffe to grow, the rest is lost as waste, or is used up in life processes like digestion, reproduction and movementSo….
    • When a carnivore, like the cheetah, eats the giraffe, only a little of the energy is passed on to the cheetah. Remember, some energy was already lost by the giraffe, so there is less for the cheetah.
    • And the cheetah will lose some energy too. The cheetah will have to eat more of the herbivores to get enough energy to survive.
      Producer
      1st level consumer
      2nd level consumer
    • When we look at energy in a food chain we sometimes make an energy pyramid. Notice how you start out with a lot of producers (acacia trees and grasses), and then have fewer 1st level consumers and even fewer 2nd level consumers.
    • A food web looks at many more parts of the ecosystem. It shows how several animals interact with each other. In food chains on earlier slides we looked at only trees, giraffes and a cheetah. But there are many more producers and consumers in the African Savannah.
      FOOD WEBS
      A food web shows how the cheetah can consume more than just a giraffe, and that there are more than just trees as producers. It is more complex.
    • FOOD WEBS
      Can you follow what eats what?
    • BALANCE IN THE ECOSYSTEM
      A problem in one part of the food web can cause problems in all of it. Imagine what would happen if there were no trees in this picture. What would happen to the giraffes? What would happen to the lions?
    • BALANCE IN THE ECOSYSTEM
      This is why all of the planet’s resources are so important. We must learn to respect nature and not upset the balance through human activities.
    • BALANCE OF THE PLANET
      Afterall, man is just one small part of the planet’s giant ecosystem. Learn more about this in your next module on Cycles of Matter.
    • SUMMARY SLIDE
      • Ecology is the study of organisms and how they interact
      • Ecosystems include organisms and their surroundings
      • Organisms can be producers or consumers
      • Producers are mainly plants, algae and some bacteria
      • Consumers can be herbivores-plant eaters, carnivores-
      meat eaters, or omnivores-eat plants and animals
      • The relationship between producers and consumers is
      shown in either food chains or more complex food webs
      • The relationship between organisms and energy is
      shown in a food pyramid
      • Disturbances in a food web can cause problems in the
      entire ecosystem