Animal Extinctionand Endangerment

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Powerpoint on Animal Mass Extinction and Endangerment for school. (World Issues)

Transcript of Animal Extinctionand Endangerment

  • 1. Mass Extinction

2. Discussion Questions

  • How many species have already been discovered on Earth?
  • How many animal/plant species go extinct every year?
  • What do you think, is the biggest cause of extinction?

3. Extinction

  • An extinct species is one that is no longer living on Earth.
  • Examples:
  • The Dodo
  • Passenger Pigeon
  • Tasmanian Wolf
  • Carolina Parakeet

4. Terms To Know

  • Vulnerable Species : A species at risk because of low or declining numbers, but not a threatened species.
  • Threatened Species : A species whose population is not yet low enough to be in danger of extinction, but they face serious problems. If problems arent resolved, they will become endangered.
  • Endangered Species : A plant or animal species that is in immediate danger of becoming extinct.
  • Extinct Species : One that no longer exists on Earth.

5. Previous Mass Extinctions

  • 5 great extinction events in the past.
  • Each one destroyed 50-95% of the life of the day.
  • The most recent, was the dinosaurs.
  • Usually driven by geological processes such as asteroids, volcanoes and sudden climate shifts.
  • Usually take millions of years to happen.
  • The 6 thgreat extinction is happening right now.
  • Called The Holocene Extinction Event.
  • It will take place in only a matter of decades.
  • The destroying of habitats, overexploitation and human induced climate change have increased during the 20 thcentury.

6. Previous Mass Extinctions

  • Scientists believe the last mass extinction was the dinosaurs caused by a meteor collision.

7. Permian Extinction

  • Happened at the end of the Permian period, 251 million years ago.
  • Volcanic eruptions created a buildup of carbon dioxide, which was then called global warming.
  • 6 degree Celsius increase in global temperature.
  • Killed 95% of species on Earth.
  • Called The Great Dying.
  • Took 100 million years for species diversity to return to normal levels.

8. How It Relates To Today?

  • Today, carbon dioxide is coming from our industrial activities and lifestyle.
  • Estimated at the end of this century there will be a 6 degree Celsius increase in global temp. if we dont make changes.
  • Global warming is already affecting timing of seasons and animals bearing young earlier than at beginning of 20 thcentury.
  • If 95% of species die out then, humans will be one of them.

9. Holocene Extinction

  • 1.5 million species have already been discovered on Earth to date.
  • Actual amount of species is estimated between 10 and 100 million, that we dont know of.
  • Approx. 150-270 species are erased from existence everyday. Including today.
  • The majority of life on Earth has never been and never will be known to us.
  • If we keep up what were doing now (pollution, deforestation), it will lead to the extinction of half of all plant and animal species by year 2100.

10. Holocene Extinction

  • The dangers of mass extinction are underestimated by almost everyone!
  • Humans are currently causing the greatest mass extinction since dinosaurs.
  • 7 in 10 biologists believe this mass extinction is a threat to human existence. Its a more serious problem than global warming.
  • They believe we are in the middle of the fastest mass extinction in the worlds history.
  • The rate of loss is greater than any time in history, including when the dinosaurs died by a meteor collision.

11. Holocene Extinction

  • The Earth is currently losing about 30,000 species of plants, animals and insects a year.
  • That is about 3 species every hour! Lost forever.
  • It will take millions of years to repair what we destroy in just a few decades.

12. Causes

  • These factors lead to the endangerment and extinction of species.
  • Habitat Destruction
  • Fast paced changes= little or no time for species to react and adjust to new circumstances.
  • Primary cause of species endangerment.
  • Humans are what cause this destruction.
  • Tropical forests are highly susceptible to destruction.
  • Examples of habitat destruction: Clear cutting, destroying by fire, logging, mining, expanding human settlements and building new towns and cities.

13. Causes

  • Everyday about 100 species are lost due to deforestation. Thats about 27,000 species a year!
  • Over half of the Earths original forests have disappeared.
  • Tropical forests contain half of the Earths species.
  • 17 million hectares are cleared/burned every year.
  • URBANIZATION
  • Increased habitat loss.
  • Bulldozing, paving, development, etc. for houses, malls, businesses and roads all destroy habitat.

14. Causes

  • Illegal Wildlife Trade/Overexploitation
  • Caused by the trade in animal parts.
  • Body Parts Trade.
  • Demands for items like rhino horns, walrus tusks and tiger bones in SE Asian countries like China.
  • Live animals are taken for the pet trade or their parts exported for medicines or food.
  • Thousands of species= part of the illegal international wildlife trade.
  • Ex. African/Asian elephants, parrots, rhinos, antelopes.
  • Causes massive declines in the numbers of many species.

15. Causes

  • Wildlife Trade Continued
  • Fur Trade.
  • Popular ins the 1950s and 1960s.
  • In the 1960s, pelts of 10,000 leopards, 15,000 jaguars and 3000 cheetahs were legally imported in the US and Europe every year!
  • Non existent now but it definitely contributed.
  • Bushmeat Trade.
  • The consumption of meat of wild animals for food in central Africa.
  • Main source of income for residents.

16. Causes

  • Bushmeat Trade Continued..
  • Hunting for bushmeat may even outrank habitat loss of rainforest animals.
  • Most common bushmeat is primates.
  • Contributes to animal extinction and linked to many diseases.

17. Causes

  • Global Warming and Pollution
  • Humans releasing carbon dioxide, chemicals and greenhouse gasses into the atmosphere which causes climate change to take place.
  • The warming of the global climate then happens.
  • Pollution affects mainly aquatic species.
  • Chemicals cause mutations and fertility problems.
  • Seen mostly in fish and polar bears.
  • A chemical commonly found in shampoos is responsible for causing many fish in the ocean to not reproduce.
  • Fish populations are decreasing.
  • As global temperature rise, many species will be forced into extinction.

18. Causes

  • Sewage dumped in water affects fish, frogs, etc.
  • 50% of freshwater species populations are declining from pollution and pesticides.
  • Global warming puts at least 20-40% of plant/animal species at risk of extinction.
  • Commercial Fishing
  • Overfishing affects fish populations and they begin to decrease.
  • About 1000 whales and dolphins drown everyday from getting tangled in fishing gear.

19. Causes

  • Pesticide
  • Spraying pesticides affects the insect populations.
  • Diseases
  • Rabies is currently destroying carnivore populations in East Africa.

20. Charts 21. Charts 22. Charts 23. How You Can Help

  • Visit a national park or wildlife reserve and appreciate the animals. Follow the guidelines, like fire regulations, dont litter and leave flowers and plants where you find them.
  • Make space for wildlife. Build a birdhouse or have a birdbath, plant a tree, compost your wastes and dont use harmful chemicals in your home or garden.
  • Recycle, Reduce and Reuse. Carpool, take public transportation, walk, ride bikes.

24. How You Can Help

  • Turn lights and appliances off when not using them.
  • Turn off the tap while brushing teeth.
  • Take your own bags to the grocery store.
  • Use energy efficient light bulbs.
  • Buy organic fruits and veggies.
  • Join an organization like WWF Canada or one in your community.

25. Facts and Stats

  • There are more than 1000 endangered species worldwide.
  • There are more than 3500 protected wildlife areas in the world. They cover 5 million sq. miles or 3% of our total land area.
  • 1/3 rdof the United State's fish species are in trouble.
  • More than 16,000 of the worlds mammals, birds and plants are threatened with ex