1. 2.1: intro to Biodiversity

2. The variety of life on earth

3. Three scales of biodiversity
1. Genetic Diversity: Genetic variation among individuals in a population (what’s a population?)

4. Environmental stressors
Physical Stress (natural disasters)
Wildfires
Pollution
Thermal stress
Radiation
Climatic (light, temperature)
Biological (predation, competition, parasitism, lack of mates)

5. Bottleneck Effect

6. 2. Species Diversity: The number of species in a region or habitat (in a community or ecosystem)

7. A species can interbreed and produce viable offspring.
# Identified and catalogued by scientists: 2 million
# Estimates of actual total number on earth: million
Most common estimate: million

8. Most common animal?

10. Most common organism: the bacterium Pelagibacter ubique (1/3rd of all single-celled ocean organisms)

11. CED
Textbook
3. Habitat/Ecosystem diversity: the variety of habitats that exist within a given region

12. Generalist species
can live under a wide range of biotic/abiotic conditions

13. Specialist species
live under a very narrow range of conditions or feed on one or a very small group of species

14. hehe

15. Species Richness:
# of Total Species

16. Species Evenness:
Abundance of individuals within each species

20. (Apple!)