Biodiversity
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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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Biodiversity

Biodiversity

Grade 9 Academic Science

R.H. King Academy


Recap

Recap

  • Define biodiversity

  • Define sustainability

  • How are biodiversity and sustainability related?


How many species are on the planet

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


Number of species vs number of organisms

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).


Areas of low biodiversity

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.


Areas of high biodiversity

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?


Tropical rainforest

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


So why does biodiversity even matter

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)


What does biodiversity do for us

What does biodiversity do for us?

  • http://wwf.panda.org/about_our_earth/biodiversity/biodiversity_and_you/


Videos

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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