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TOPIC:
BIODIVERSITY
Essential Question: Explain
biodiversity and why it is important to
have a diverse ecosystems.
INSTRUCTIONS:
1. Take Cornell Notes
2. Stop & Answer slides ~ on a plain
   sheet of notebook paper
3. Write the question & your answer.
   (Your answer MUST be in
   complete sentence.)
4. You MUST have a minimum of five
   (5) sentences for each question.
Biodiversity
iodiversity refers to the number and variety of
                species on Earth.


he number of known species on Earth is about
    1.6 million, most of which are insects.


  his is different from the actual number of
 species on Earth, which may be closer to 13
Importance of Biodiversity

iodiversity provides:
    a variety of products and resources
    a livable planet for us and for all other species.



iodiversity helps:
    maintain the atmosphere
    keep the soil fertile
Loss of Biodiversity
 e share the environment with other organisms in
 a complex network.
 ach species has a role or niche to play in its
 ecosystem.
 f one species disappears from an ecosystem,
 the ecosystem changes.



  eystone species are species that are so
     important to the functioning of an
   ecosystem that if they disappear, the
          ecosystem falls apart.
An Example in Texas:
Black-tailed Prairie
                       lack-tailed prairie dogs once
Dogs
                       roamed the western mid-west.

                       Now cover less than 1% of their
                        original territory.

                       Digging aerates and promotes soil
                        formation.

                       Clip back brush maintaining the
                        short grass prairie.

                       Provide food and shelter for as
                        many as 170 different animals.
Main Threats to
Biodiversity
• Habitat loss
• Introduced species
• Population growth
• Pollution
he destruction of habitats is the number
Habitat Loss   one cause of species extinction.
Stop & Answer
 ow does habitat loss affect biodiversity in an
 ecosystem?
Introduced Species
 onnative or Exotic species that are not native to a
 particular region.


   ire ants from South America entered the U.S. through
 Mobile, Alabama, probably in soil used for ships' ballasts.
 They were accidentally introduced around the 1930's and
             have been spreading ever since.
Stop & Answer:
 ow do introduced species affect biodiversity
 in an ecosystem?
Population Growth
 here are 6 billion humans living on Earth.

 arth’s population of human beings is increasing at a rate of
 about 222,000 people each day.

 umans take up more space and deplete more resources than
 any other species.
an be an oil spill, acid rain, trash or
Pollution   insecticides that can cause
            reproductive failure in fish, birds, and
            mammals (like DDT).
Stop & Answer:
 ow does pollution affect biodiversity in an
 ecosystem?
Extinction
Extinction occurs when the last individual of a species dies.


                  an Marcos Gambusia, Texas, 1983




                exas red wolf, Oklahoma, Texas, 1970
Mass Extinction
•   the extinction of many species during a
    relatively short period of time.
•   often caused by a change in climate.

•   Many scientists believe that we are living
    in a mass extinction, and that by the year
    2100, 25% or more of all species of plants
    and animals that were on Earth in 1900
    will have become extinct.
Stop & Answer:
ow will this mass extinction affect Earth?

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Biodiversity presentation2

  • 1. TOPIC: BIODIVERSITY Essential Question: Explain biodiversity and why it is important to have a diverse ecosystems.
  • 2. INSTRUCTIONS: 1. Take Cornell Notes 2. Stop & Answer slides ~ on a plain sheet of notebook paper 3. Write the question & your answer. (Your answer MUST be in complete sentence.) 4. You MUST have a minimum of five (5) sentences for each question.
  • 3. Biodiversity iodiversity refers to the number and variety of species on Earth. he number of known species on Earth is about 1.6 million, most of which are insects. his is different from the actual number of species on Earth, which may be closer to 13
  • 4. Importance of Biodiversity iodiversity provides:  a variety of products and resources  a livable planet for us and for all other species. iodiversity helps:  maintain the atmosphere  keep the soil fertile
  • 5. Loss of Biodiversity e share the environment with other organisms in a complex network. ach species has a role or niche to play in its ecosystem. f one species disappears from an ecosystem, the ecosystem changes. eystone species are species that are so important to the functioning of an ecosystem that if they disappear, the ecosystem falls apart.
  • 6. An Example in Texas: Black-tailed Prairie lack-tailed prairie dogs once Dogs roamed the western mid-west. Now cover less than 1% of their original territory. Digging aerates and promotes soil formation. Clip back brush maintaining the short grass prairie. Provide food and shelter for as many as 170 different animals.
  • 7. Main Threats to Biodiversity • Habitat loss • Introduced species • Population growth • Pollution
  • 8. he destruction of habitats is the number Habitat Loss one cause of species extinction.
  • 9. Stop & Answer ow does habitat loss affect biodiversity in an ecosystem?
  • 10. Introduced Species onnative or Exotic species that are not native to a particular region. ire ants from South America entered the U.S. through Mobile, Alabama, probably in soil used for ships' ballasts. They were accidentally introduced around the 1930's and have been spreading ever since.
  • 11. Stop & Answer: ow do introduced species affect biodiversity in an ecosystem?
  • 12. Population Growth here are 6 billion humans living on Earth. arth’s population of human beings is increasing at a rate of about 222,000 people each day. umans take up more space and deplete more resources than any other species.
  • 13. an be an oil spill, acid rain, trash or Pollution insecticides that can cause reproductive failure in fish, birds, and mammals (like DDT).
  • 14. Stop & Answer: ow does pollution affect biodiversity in an ecosystem?
  • 15. Extinction Extinction occurs when the last individual of a species dies. an Marcos Gambusia, Texas, 1983 exas red wolf, Oklahoma, Texas, 1970
  • 16. Mass Extinction • the extinction of many species during a relatively short period of time. • often caused by a change in climate. • Many scientists believe that we are living in a mass extinction, and that by the year 2100, 25% or more of all species of plants and animals that were on Earth in 1900 will have become extinct.
  • 17. Stop & Answer: ow will this mass extinction affect Earth?