1. Kinds of Organism Interactions
Predation
Competition
Symbiotic relationship
Some relationships are difficult to
categorize

2. Kinds of Organism Interactions
Predation (predator & prey relationship)
One organism known as a predator, kills and eats another known as prey

3. Robins & Earthworms: Predation

4. Venus Flytrap & Insect: Predation

5. Kinds of Organism Interactions
2. Competition
Two organisms strive to obtain the same limited resources.
Intraspecific competition
Is competition between members of the same species.
Interspecific competition
Is competition between members of different species.

6. Intraspecific competition (same species)

7. Interspecific competition (different species)

8. Kinds of Organism Interactions
3. Symbiotic relationships
Is a close, long lasting, physical relationship between TWO different species.
3.1 Parasitism (+,-)
Is a relationship in which one organism (parasite) lives inside or on surface of another organism known as the host, from which it derives nourishment

9. Live on the surface of their hosts such as fleas, lice, mildews.
3.1.1 Ectoparasite
Live on the surface of their hosts such as fleas, lice, mildews.
3.1.2 Endoparasites
Live inside the bodies of their hosts such as tapeworms, malaria parasites.

10. Ectoparasite: Live on the surface of hosts

11. Lice: Parasitism (Ectoparasite)

12. Mildews (Ectoparasite): a black, green, or whitish area caused by a fungus that grows on things such as plants, paper, cloth, or buildings, usually if the conditions are warm and wet:

13. Tape worms: Parasitism (Endoparasite)

14. Endoparasites: Live inside the bodies of hosts

15. Kinds of Organism Interactions
3.2 Commensalism (+,0) Is a relationship between organisms in which one organism benefits while the other is not affected.
Shark and remoras (small fish)

16. Wild Orchids: Commensalism

17. Kinds of Organism Interactions
3.3 Mutualism (+,+) Is actually beneficial to both species involved. The relationship is obligatory; the species cannot live without each other.

18. Bee and Flower: Mutualism

19. Kinds of Organism Interactions
4. Some relationship are difficult to categorize
How would you classify mosquitos?
There are also mutualistic relationship that do not require permanent contact between participants in the relationship