1. Biological Communities
Chapter 17
Pre AP Biology
Spring ‘13

2. Relationships within an ecosystem
No one organism can survive by itself. Organisms depend on each other.

3. Predator-Prey
Predation is a relationship between 2 organisms in which one is being consumed so that the other can gain energy.
The predator does the eating, the prey gets eaten.

4. Symbiotic Relationships
Symbiosis – when two or more species live together in a close, long-term association.
Three major kinds of symbiosis:
Parasitism
Mutualism
Commensalism

5. Parasitism One organism feeds on another.
Usually lives on or in another larger organism which is called a “host”
Parasites don’t kill their host.

6. Mutualism
Mutualism is a relationship in which both species benefit.

7. Commensalism
Commensalism is a relationship in which one species benefits and the other is neither harmed nor hurt.

8. Climate's Effect on Where Species Live
Where organisms live is determined by the climate.
Climate is the prevailing weather conditions in a given area largely determine where species live.
2 most important aspects of weather are:
Temperature
Moisture

9. Temperature and Moisture are related
The warmer the air, the more moisture it will hold.
Temperature also decreases as altitude increases.
So the air is colder and drier in the mountains.

10. How Temperature and Moisture Effect Ecosystems

11. Biome
Biome - A major biological community that occurs over a large area of land.
There are 2 kinds: Aquatic biomes and Terrestrial biomes

12. Aquatic Communities
Aquatic communities interact with the terrestrial biomes
There are three kinds of Aquatic Communities:
Freshwater Communities
Wetlands
Marine Communities

13. Fresh Water Communities

14. Marine Communities