1. Interactions within Communities
Chapter 24, Section 3

2. Obtaining Energy Ways to Obtain Energy Organisms can:
Make their own energy
Get energy by eating something else

3. Obtaining Energy Producers
Organisms that use outside energy sources to make their own food.
2 processes:
photosynthesis
chemosynthesis

4. Obtaining Energy Producers Photosynthesis
Uses sunlight to make sugars (food).
Organisms contain chlorophyll.

5. Obtaining Energy Producers Chemosynthesis
Breaks down inorganic molecules (like sulfur) for food.

6. Obtaining Energy Consumers Organisms that cannot make their own food.
4 types:
Herbivores
Carnivores
Omnivores
Decomposers

7. Obtaining Energy
Consumers
Herbivores
Eat producers (vegetarians)

8. Obtaining Energy
Consumers
Carnivores
Eat other consumers

9. Obtaining Energy
Consumers
Omnivores
Eat both plants and animals

10. Obtaining Energy Consumers Decomposers
Break down and consume wastes and decaying materials

11. Obtaining Energy Food Chains
Simple model of feeding relationships in an ecosystem (what eats what)

12. Symbiotic Relationships
A close and permanent relationships between individuals of different species.
3 types:
Mutualism
Commensalism
Parasitism

13. Symbiotic Relationships
Mutualism
Both species benefit from the relationship.

14. Symbiotic Relationships
Commensalism
One species benefits and the other species is not harmed or helped.

15. Symbiotic Relationships
Parasitism
One species benefits but the other species is harmed.

16. Niches Niche How an organism survives, such as how it:
Obtains food
Obtains shelter
Finds a mate
Cares for young
Avoids danger
Includes any adaptations for survival.

17. Niches Predator-Prey Relationships
Presence of a predator limits the size of prey and increases the number of species that can survive in the ecosystem.

18. Niches
Cooperation
Cooperation among organisms living in a social group.
Increases the chance of survival.