1. Biodiversity: Who cares?

2. Do Now: Turn in 3-2 Homework to bin.
What is the difference between primary and secondary succession? Make a T-chart to answer this question.
Ecological hotspots are areas in which species are at high risk of extinction. Why might species be at risk of extinction?

3. Which do you like better?A

4. Which do you like better?A

5. Which do you like better?A B

6. What do you think biodiversity means?

7. Biodiversity is the total variety of life
Biodiversity depends on the interdependence of all living things
Scientists have identified more than 1.4 million species. Tens of millions -- remain unknown (
The tremendous variety of life on Earth is made possible by complex interactions among all living things including micro-oganisms.
Students should have a definition for biodiversity

8. Within an ecosystem there can be many HABITATS
Area where organism lives, includes abiotic and biotic factors...
Students should have a definition for habitat

9. HABITATS might describe:
The NAME of the place where the organism lives.
E.g., Arctic Canada is the habitat of the polar bear Ursa maritima.

10. HABITATS might describe:
The DOMINANT VEGETATION of the place where the organism lives.
E.g., Heather moorland is the habitat of the grouse.

11. HABITATS might describe:
The TYPE of place where the organism lives.
E.g., species of fish like Pike (Esox lucius) are found in freshwater lakes and ponds.

12. Which is more diverse? B A

13. Which is more diverse? A B

14. Which has more biodiversity?

15. Which has more biodiversity?

16. What do we get from biodiversity?
Oxygen
Food
Clean Water
Medicine
Healthy Environment
Recreation
Students should know why biodiversity is important. Have students take 30 seconds for think pair share for ideas.

17. Ecological Hotspots: Biodiversity in Danger!!
Discuss the red zones as areas where biodiversity is most threatened. What are the causes of loss of biodiversity?

18. Should we be concerned about biodiversity?
What we know: The Earth is losing species at an alarming rate
Students don’t need these notes but should discuss.

20. Threats to biodiversity
*Habitat Loss
*Invasive Species
*Pollution
Global Climate Change
Overexploitation of Resources
* Are the threats we will discuss in class

21. Habitat Loss
Resulting from habitat destruction

22. Habitat Loss Resulting from habitat fragmentation
When a larger habitat is broken into smaller separate pieces

23. Habitat Fragmentation
Loss of connectivity between populations
Results in reduced gene flow between populations
Reduces the amount of habitat and resources

24. Invasive Species
When species are introduced to a new environment and negatively affect native species

25. Invasive Species Outcompete native species Disturbs existing food webs
Habitat
Food sources
Disturbs existing food webs
Overexploit native species
Transmit diseases and parasites
“Frankenfish” – invasive snakehead fish

26. The Problem With Pollution: Biological Magnification
The increase in concentration of toxic compounds in the food chain as the trophic levels increase.
Picture of thinning egg shells affectged by DDT

27. Biological Magnification
DDT as applied to reduce mosquitoes
Residues of DDT found in each trophic level
Higher trophic levels had greater amounts of DDT
Eagles showed thinning egg shells and reduced fitness
Eagles were listed as endangered and DDT spraying was banned in many countries.
Eagles now have increased fitness, including reproductive success
Students should understand general concept.
Remind students what fitness means.

28. If each grebe ate 8 fish, the grebe would have 1600 ppm.
If each water droplet contains 2 ppm, and a plankton ingests 2.5 water droplets, the plankton would have 5 ppm.
If each fish ate 40 plankton that had 5 ppm, the fish would have 200 ppm.
If each grebe ate 8 fish, the grebe would have 1600 ppm.
A simplified illustration of biological magnification. The red dots represent units of DDT. Starting with a low concentration in the water, the DDT concentration (density of red dots) increases within the bodies of each successive trophic level, ultimately reaching a lethal concentration in the Grebes.