Ecological Relationships: Symbiosis

1. Ecological Relationships:Symbiosis In your notes, write your name in the center of the paper. Then write the names of 8 other people with whom you interact and share resources.

2. Symbiosis • In 1879 German botanist Heinrich Anton de Bary coined the term "symbiosis" to describe these relationships, meaning the living together of different species of organisms. • Biology Reference. http://www.biologyreference.com/Se-T/Symbiosis.html. Oct 29, 2007.

3. Mutualism • Species A and Species B both benefit(+, +) • For example, a bird lands on a blackberry bush and eats a berry, which contains many seeds. The plant provides a meal, and the bird disperses the seed, greatly expanding the plant’s range.

4. Commensalism • Species A benefits and there is no effect on Species B (+, 0)

5. Parasitism • Species A benefits (parasite) and Species B (host) is harmed (+, -) • Examples: ticks, tapeworms

6. Competition • Interaction between two or more organisms when resources are in short supply • Often results when organisms occupy the same niche • Results are: starvation, fighting, death and could even be elimination of species

7. Carrying capacity • Maximum number of organisms of a certain species an area can support • Example: Kaibab deer (30, 000) • What happens when we go above carrying capacity?

8. Your own resources • Look back at the names you wrote down. Draw an arrow to the different names and state whether that relationship is mutualistic, commensalistic, or parasitic and why