1. COMMUNITY ECOLOGY contpp

2. Species (organism)
Population
Community (interaction of different species)
Ecosystem
Biosphere

3. PROPERTIES OF A COMMUNITY
Species Richness
Species evenness
Species- Area Effect

4. Species Richness: # of different types of species
varies with latitude (closer to equator the more species)
more sun, better climate stability

5. Species evenness: the abundance of each species

6. ↑species richness and ↑ evenness:
↑ stability (ability to withstand
disturbances in the ecosystem)

7. Species- Areas Effect: larger areas contain more species than smaller areas

8. KEYSTONE SPECIES most dominant species in the community
Dictates community structure
Demonstrated by removal of keystone species from community
What would happen to the species richness if the keystone species is removed from the ecosystem?

10. SUCCESSION Sequential and gradual growth of a community Two types:
primary and secondary

11. Primary succession occurs when land is first formed.
1. Microbes, lichens and mosses must create soil before other plants can grow.
2. Pioneer species: first species to dominate early in succession (small and fast growing)

12. Secondary succession occurs when succession must start over after the destruction of a climax community (marked by the domination of long-lived species and great diversity).
- takes place on sites that have already supported life

13. Homework
Read pp
P 410 #1-5, 8
Worksheet #5