1. Community Relationships
between the species of an ecosystem

2. Predator and Prey relationship

4. Note the lag time! As prey increases, predators increase
a proportionate relationship
As predator populations increase, prey decrease
an inversely proportionate relationship

5. prey population size is greater than predator population size

6. Atlantic Rock Crab Predation
Predators are larger than their prey
Prey
size
Predator size

8. SYMBIOSIS

9. Teeth cleaning for the crocodile
Food for the plover
Both species benefit
MUTUALISM

10. Egrets ride on the backs of mammals,
cleaning the fur of the mammals.
Egrets are sensitive to changes in their surroundings providing
an early warnings system for the mammals.

11. Zebra has good sense of smell
Ostrich has good eyesight

12. Microorganisms in the termite gut digests the cellulose of the wood termites eat.
The bacteria gets a home; termites get nutrients

13. COMMENSALISM One species benefits In a coral reef, the
corals depend on the
algae for photosynthesis
If the temperature of the
ocean rises, the algae stop
carrying out photosynthesis,
creating a life threatening
danger for the coral

14. Baleen whales feed by swimming through clouds of plankton
The barnacle extend its feathery, filtering arm to capture food as well

15. One benefits, the other is harmed
PARASITISM
One benefits, the other is harmed
(but not killed!)
Oxpecker birds eat the parasites off of African buffalo
But in doing so, they pick at scabs and keep wounds open

16. Mistletoe steal food and
water from oak trees

17. Flea bites, feeds on blood
Dog itches

18. Parasites have specially designed mouth parts!

19. Ticks are external parasites

20. Lampreys are too - on fish

21. Many worms are parasites