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Biodiversity

Biodiversity. Grade 9 Academic Science R.H. King Academy. Recap. Define biodiversity Define sustainability How are biodiversity and sustainability related?. How many species are on the planet?. See Table 1.1. on p. 9 Which category of organisms has the most species?

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Biodiversity

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  1. Biodiversity Grade 9 Academic Science R.H. King Academy

  2. Recap • Define biodiversity • Define sustainability • How are biodiversity and sustainability related?

  3. How many species are on the planet? • See Table 1.1. on p. 9 • Which category of organisms has the most species? • There are about 2 million identified species on Earth • There are perhaps 5-100 million species on Earth, but many still haven’t been identified

  4. Number of species vs. number of organisms • An ecosystem can have a high number of organisms. But this does not mean it has high biodiversity. (E.g. 100000 pigeons) • What makes an ecosystem biodiverse is a high number of a variety species. (E.g. several bird species: pigeons, robins, sparrows, jays, grouse, starlings, hawks, etc).

  5. Areas of low biodiversity • Areas of low biodiversity tend to have: • Cooler temperatures • Low precipitation • More human disturbances • Urban areas tend to have lower biodiversity because most species’ niche does not allow them to live in urban areas with concrete, pollution, humans, cars, etc. • Only a few species have managed to find a niche in urban areas • Examples: raccoons, squirrels, pigeons, wasps, dandelions, etc.

  6. Areas of high biodiversity • The most biodiverse regions are those with • Warm temperatures • High precipitation • No/little human disturbance • Therefore, which biomes do you think have the most biodiversity?

  7. Tropical Rainforest • The Tropical Rainforest is the biome with the most biodiversity in the world • It is called a “biodiversity hotspot” • However, it is being greatly threatened by human disturbances: • Deforestation and logging • Poaching and hunting • Climate change

  8. So why does biodiversity even matter? • Low biodiversity makes an unsustainable ecosystem because • Fewer species are able to survive • Disease is more likely to spread across the same species… when there are many different species, disease likely won’t spread between them. • Biodiversity is needed to ensure sustainability for all life forms, including humans • Despite what you think, we are part of nature. We need ecosystems for our: • Food • Water • Medicine • Materials (e.g. paper)

  9. What does biodiversity do for us? • http://wwf.panda.org/about_our_earth/biodiversity/biodiversity_and_you/

  10. Videos • David Suzuki • https://www.youtube.com/watch?v=N5ssjM2Fjuc • Earth Focus: Biodiversity and Health • (up to 20:00) http://www.linktv.org/video/7724/biodiversity-and-health

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