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Impacts on Biodiversity

Michaelis. Impacts on Biodiversity. Overfishing and Overhunting . One threat to biodiversity occurs when humans cause ecosystems to ____________ by using too many natural resources or taking away a ______________________. collapse. k eystone species. Overfishing and Overhunting .

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Impacts on Biodiversity

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  1. Michaelis Impacts on Biodiversity

  2. Overfishing and Overhunting • One threat to biodiversity occurs when humans cause ecosystems to ____________ by using too many natural resources or taking away a ______________________. collapse keystone species

  3. Overfishing and Overhunting Keystone species • ____________________: An organism that is necessary for keeping an ecosystem in _____________. • Example: Sea Otter balance

  4. Overfishing and Overhunting Facts: • Only marine mammal without ___________... blubber

  5. Overfishing and Overhunting • How do they stay warm in the cold ocean? • Otters have the ____________________ fur of any mammal. • Fur is so thick that their skin never gets wet when they swim: ___________ hairs per square centimeter. densest fur 400,000

  6. Overfishing and Overhunting • During the fur trade humans hunted otters almost to _____________ for their ____________________. • By 1911 the sea otter population had dropped to roughly 1,000 individuals. extinction thick warm pelts

  7. Overfishing and Overhunting Sea Otter’s Niche: • Eats _______________. • Uses ___________________ to break open sea urchins. sea urchins rocks and shells

  8. Overfishing and Overhunting Sea Otter’s Niche: • Predators: _____________________________ • Uses ________________________ themselves while they eat and sleep. sharks and humans seaweed to anchor

  9. How Sea Otters Keep Their Ecosystem in Balance sea urchin population down • Otters keep the ___________________________. • Sea urchins eat away at the _______ of sea weed. • Fish and other sea life rely on the sea weed forests for _____________________________. base food and shelter

  10. Overhunting Keystone Species: How do you think the decreasing otter population affects the ocean ecosystem? • Otter population is DOWN • Sea Urchin Population = ______________ • Sea Weed Population = _______________ • Fish Population = ____________________ • Seal Population = ____________________ • Orca Population = ____________________ increases decreases decreases decreases decreases

  11. Overhunting Keystone Species: What are the long term implications on the food web in this situation? Urchin Barrens

  12. Biological Magnification • When carnivores eat herbivores that have been _________________________________. • Causes concentrations of harmful substances to ___________________________________. contaminated with pollution accumulate in higher trophic levels

  13. Biological Magnification • Class Demonstration • In this demo assume that __________ of pollutant will cause this animal to: • ___________ • Make them ___________ • Make them very ______________ 100 ppm die sterile unhealthy

  14. Biological Magnification • Class Demonstration • How many parts per million does the guppy have? • How many parts per million does the salmon have? • How many parts per million does the eagle have?

  15. Biological Magnification • Class Demonstration • What type of organisms are affected the most by biological magnification? • How do you think biodiversity will be affected?

  16. Invasive Species harm the ecosystem Species that are brought to an ecosystem by humans and _________________________ because they ______________________________. do not have any natural predators

  17. Invasive Species 50,000 • _______________ exotic species live in the U.S. • _____________________ spent to help undo the damage they cause • Invasive species also threaten _____________ of the species currently protected under the ________________________ $130 billion per year nearly half Endangered Species Act

  18. Kudzu in Alabama

  19. Zebra Mussels

  20. Invasive Species – Burmese Python, Florida

  21. Introduced Beavers - Tierra Del Fuego, South America

  22. Cane Toad Video

  23. Invasive Species Rats in Hawaii Example: ___________________________ I’iwi Birds are ________________. They are an ________________________. I’iwiare one of many Hawaiian Birds that _____ __________________________________ native to Hawaii endangered species face extinction due to invasive species.

  24. Hawaii Invasive Species • Hawaii Invasive Species Video

  25. Invasive Species Questions: How do you think rats harm the I’iwi bird population? Why do you think the rat population does so well in Hawaii?

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