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Changes in Ecosystem

Changes in Ecosystem. Chapter 4. How are Ecosystems Balanced?. All living things depend on one another and their environment to live and grow. Interactions among living and nonliving things help maintain balance in ecosystems.

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Changes in Ecosystem

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  1. Changes in Ecosystem Chapter 4

  2. How are Ecosystems Balanced? • All living things depend on one another and their environment to live and grow. • Interactions among living and nonliving things help maintain balance in ecosystems. • All plants and animals need food, water, living space, shelter, light, and air to grow and be healthy. • Living things can ONLY survive in environments where their needs are met.

  3. A Balancing Act • Ecosystems are healthy when all their parts are in balance.

  4. Example of a Balanced Ecosystem • Rabbits eat grass. This keeps the grass from taking over the space • The Red Fox eats the rabbits. This helps keep the rabbit population from getting too large and eating too much grass. • The grass and plants provide the oxygen and moisture that the animals need.

  5. How do Organisms Interact • As the population INCREASES, more food, water, and living space is needed. • If the population continues to increase, they will use up all the resources. Example: The red fox population increases. They eat the rabbits. After a short time, there are no rabbits left for the foxes to eat. The foxes then have to move to another area or they will die.

  6. Competing • Competition happens when two or more species must share the same limited resources. • Animals must use their adaptations to compete for the resources. • The animal that competes more successfully will more likely live and reproduce. • Discovery Video

  7. Sharing Resources • Animals can successfully share resources by working together and eating at different times of day. • For example: Owls and Hawks both eat the same animals. However, hawks eat at night and owls eat at night. By eating at different times they can share the same resources.

  8. Helping Each Other • Two organisms can live by each other all their lives and BOTH organisms can be helped. • Fungi and algae live together on the surface of rocks. • The algae supply the fungi with sugar, nutrients, and water. • The fungi protect the algae from too much sunlight and from warm temperatures.

  9. One Helped • Sometimes 2 organisms live side by side and one organism is helped and the other is neither helped nor hurt. • Moss lives on an Oak Tree. The Oak Tree gives the moss shade from the sun. The moss does not help or harm the Oak Tree.

  10. One Helped, One Harmed • Sometimes two organisms live together and only one organism is helped, but one is harmed. • The one that is helped is called the PARASITE. • The one that is harmed is called the HOST. • Mistletoe is a Parasite that lives on a tree. The tree is the Host. Mistletoe takes the water and nutrients away from the tree.

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