1. Food Webs Within Ecosystems
Marine, Freshwater, and Terrestrial
FOOD WEBS

2. Ecosystems
An ecosystem is a community of organisms interacting with one another and their environment.
An ecosystem includes all biotic and abiotic factors.
Biotic Factors – All living things
Plants, animals, fungi and bacteria
Abiotic Factors – All nonliving things
Water, land, light, temperature and soil composition.

3. Marine Ecosystems
Oceans

4. Freshwater Ecosystems
Lakes, ponds, rivers, streams and aquifers

5. Terrestrial Ecosystems
Forests, Deserts, Grasslands, Mountains

6. A habitat is a place where an organism lives.

7. Population
A population is a group of individuals of the same species that live in a certain area.

8. Community
A community is all of the populations that live and interact with each other in an area.

9. Niche A niche is the role of an organism within it’s community.
Includes what it eats, when it eats and where it lives.
Coral, plankton, fish

10. Food Chain
A food chain shows how the energy in food is passed from organism to organism in an ecosystem.

11. Food Web
A food web is a combination of all the overlapping food chains in an ecosystem.

12. Producers
Producers are organisms that make their own food through photosynthesis.
Examples – plants, algae and plankton

13. Consumers
Consumers are organisms that eat other organisms to obtain food for energy.

14. There are 3 Types of Consumers
Herbivores – Animals that only eat plants
Omnivores – Animals that eat plants and other animals
Carnivores – Animals that only eat other animals (meat)

15. Primary Consumer
Secondary Consumer
Tertiary Consumer

16. Predator/Prey Relationships
Predator – Organism that eats another organism
Prey – Organism that is eaten by the predator

17. Parasite/Host Relationships
Parasite – organism that feeds off other living creatures
Fleas, Ticks, Worms, Lice, etc.
Host – organism on which the parasite is feeding. Always bad for host!

18. Decomposers
A decomposer is an organism that gets their energy by breaking down dead organisms.