Animal Extinctionand Endangerment
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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?
- An extinct species is one that is no longer living on Earth.
- 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.
- 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.
- 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.
- Increased habitat loss.
- Bulldozing, paving, development, etc. for houses, malls, businesses and roads all destroy habitat.
- 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.
- 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.
- 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.
- 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.
- 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.
- Spraying pesticides affects the insect populations.
- 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