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Understanding the Biosphere and Ecosystems: Biotic and Abiotic Factors

Explore the concept of the biosphere and ecosystems, including the interplay between biotic and abiotic factors. Learn about populations, biodiversity, and the importance of keystone species.

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Understanding the Biosphere and Ecosystems: Biotic and Abiotic Factors

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  1. The portion of the Earth in which all life exists is known as (1) Climax stage (2) Biosphere (3) Population (4) Biotic community

  2. Which group of organisms is an example of a population • Leopard frogs in a stream • Birds in Colorado • Reptiles in Sahara desert • Trees in a forest

  3. An aquarium ecosystem is shown below A community in this aquarium consists of… • Plants and gravel • Fish, plants, snails • Fish, water, snails • Water and gravel

  4. Biotic vs. Abiotic Factors

  5. Example Ecosystem= Garden • The garden’s success depends on what factors? animals eating plants insects to pollinate plants’ flowers Sunlight water fertilizer worms aerating soil Kids trampling on plants

  6. Biotic vs. Abiotic • Biotic= • Abiotic= factors are living things such as plants, animals, fungi, and bacteria Factors are nonliving things such as moisture, temperature, wind, sunlight, and soil

  7. From the garden example… Worms aerating soil water fertilizer Animals eating plants sunlight Insects pollinating plants’ flowers Kids trampling plants

  8. Another example: Coral Reefs near salt water marshes Biotic factors: mangrove trees provide food and shelter for fish Abiotic factors: oxygen, salinity

  9. Ecosystems are always changing • Example: Long period of increased precipitation might allow one plant species to grow better than another Same number of plants but community’s composition is changing Dynamic equilibrium: factors are changing but remains in balance

  10. Biodiversity • Definition: Assortment or variety of living things in an ecosystem • Area with high biodiversity has a large assortment of different species living near one another

  11. Keystone Species • Ecosystem is a complex web of connected biotic and abiotic factors • Definition: -Example: species that has an unusually large effect on its ecosystem Beavers use trees to construct dams which modify streams

  12. Activity: Word Scramble • Include all of the following words from today’s discussion in a paragraph summarizing what you learned. Ecosystem Biotic Factors Biodiversity Abiotic Factors Keystone Species Changing Connected

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