1. Exam 1 key posted
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2. New species and extinction
Fig 25.14
New species and extinction

3. Biodiversity- number of species within an area
Fig 56.3
Genetic Diversity
Biodiversity- number of species within an area
Ecosystem Diversity

4. If a species loses genetic diversity, it can go extinct
Fig 56.11

5. Fig 56.10
Extinction vortex

6. Resources are not evenly distributed
Fig 55.6
Resources are not evenly distributed

7. Biodiversity- number of species within an area
Fig 56.3
Genetic Diversity
Biodiversity- number of species within an area
Ecosystem Diversity

8. Larger areas can support more biodiversity
Fig 54.28
Islands

9. Larger areas can support more biodiversity
Fig 54.26
# bird species

10. Water is critical for biodiversity
Fig 54.25

11. New species can have an affect throughout the ecosystem
Fig 54.16

12. Interactions include area, climate, competition...

13. Increased numbers of one species can reduce the population of other species

14. Competition limits where species can live
Fig 54.3
Competition limits where species can live

15. niche- the specific environment where a species lives
Fig 54.3
niche- the specific environment where a species lives

16. Niche overlap leads to competition.

17. Prolonged direct competition is rare.

18. Prolonged direct competition is rare.

19. Where these species overlap, they do not compete.
Fig 54.4
Where these species overlap, they do not compete.

20. Changes in Extinctions and Biodiversity

21. Have we overstated the tropical biodiversity crisis. William F
Have we overstated the tropical biodiversity crisis? William F. Laurance Trends in Ecology & Evolution Vol. 22: February 2007

22. Are we on the verge of a massive die-off of tropical species?

23. Increased rural density leads to decreased forest.

24. The good news?
About 21–24% of species in the Asian tropics and 16–35% of species in the African tropics are threatened with possible extinction.

25. Rural populations are expected to decline.

26. Substantial areas of agricultural land are likely to be abandoned.
This could enable significant forest regeneration, which could help buffer species losses from deforestation.

27. Not all habitats are equal
Fig 56.13
Not all habitats are equal

28. A third to a half of all old-growth species avoid younger (<30-year-old) regrowth.

29. Technology means that more resources can be extracted by fewer people.

30. Rural populations are expected to decline, but increased urban population will demand more resources.

31. Exam 1 key posted
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