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Keystone and Non-Native Species

Keystone and Non-Native Species. Honors biology Mrs. Stewart Central magnet school. CLE 3210.2.3: Predict how global climate change, human activity, geologic events, and the introduction of non-native species impact an ecosystem. When you’ve mastered this you will be able to:

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Keystone and Non-Native Species

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  1. Keystone and Non-Native Species Honors biology Mrs. Stewart Central magnet school

  2. CLE 3210.2.3: Predict how global climate change, human activity, geologic events, and the introduction of non-native species impact an ecosystem. When you’ve mastered this you will be able to: Predict how a specific environmental change may lead to the extinction of a particular species (SPI 3210.2.6)

  3. CLE 3210.2.1 : Investigate how the dynamic equilibrium of an ecological community is associated with interactions among its organisms. When you’ve mastered this, you will be able to: Make inferences about how a specific environmental change can affect the amount of biodiversity (spi 3210.2.5)

  4. Wolves in Yellowstone

  5. Beavers in Yellowstone

  6. Keystone Species A species that plays a critical role in maintaining the structure of an ecological community and whose impact on the community is greater than would be expected based on its relative abundance or total biomass. Example: the disappearance of wolves in Yellowstone lead to the disappearance of beavers in Yellowstone.

  7. How did the disappearance of wolves lead to the disappearance of beavers? THINK – Pair – Share How do we get from here to there?

  8. The answer: Elk in Yellowstone

  9. Ecological Impacts

  10. Ecological Impacts Less wolves = more elk and more coyote More elk = less grazing land and less willows, aspen and cottonwood Less trees = less beavers More coyotes = less foxes, hares, ground nesting birds, small rodents and young deer Less small prey = More vegetation such as clover, nuts, etc.

  11. Non-Native Species Honors biology Mrs. Stewart Central magnet school

  12. CLE 3210.2.3: Predict how global climate change, human activity, geologic events, and the introduction of non-native species impact an ecosystem. When you’ve mastered this you will be able to: Predict how a specific environmental change may lead to the extinction of a particular species (SPI 3210.2.6)

  13. CLE 3210.2.1 : Investigate how the dynamic equilibrium of an ecological community is associated with interactions among its organisms. When you’ve mastered this, you will be able to: Make inferences about how a specific environmental change can affect the amount of biodiversity (spi 3210.2.5)

  14. Kudzu Vines

  15. Non-Native Species • A species that occurs outside its normal habitat (range) • Example: Kudzu vines in America • Originated in Japan and Southeast China • Brought to USA for: • Ornamental uses • Medicinal uses • Erosion control uses (among others)

  16. What has happened to the “native” species in the environment? What are the ecological impacts of non-native species?

  17. Ecological Impacts • Non-native species will consume limited resources usually available for native species • Such as: nutrients (nitrates), food, sunlight, groundwater, space • Negative effects include: • Decrease in biodiversity (due to decrease in resources) • Cover large amounts of space resulting in exclusion of local species • How do we control it?

  18. What are some of the impacts of invasive species? • Invasive = a new species arrives, survives and thrives • What could a new species cause to happen in an environment? • What do new species bring with them?

  19. Lionfish How could the introduction of the lionfish decrease the survival of the native reef fish? What ecological aspects are occurring?

  20. Homework: Find and analyze a scientific article about a Keystone species and its effect on an ecosystem Find and analyze a scientific article about a non-native species and its effect on an ecosystem

  21. CLE 3210.2.3: Predict how global climate change, human activity, geologic events, and the introduction of non-native species impact an ecosystem. When you’ve mastered this you will be able to: Predict how a specific environmental change may lead to the extinction of a particular species (SPI 3210.2.6)

  22. CLE 3210.2.1 : Investigate how the dynamic equilibrium of an ecological community is associated with interactions among its organisms. When you’ve mastered this, you will be able to: Make inferences about how a specific environmental change can affect the amount of biodiversity (spi 3210.2.5)

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