1. Symbiotic Relationships
Sym - together
Bio - life

2. Symbiosis means “living together”
Sym - together
Bio - life
So…..
Symbiosis means “living together”

3. Symbiosis
When one organism depends on another for its survival, they have a symbiotic relationship.
Another way to say it: Symbiosis is a relationship between one organism and another.

4. Symbiotic Relationships
Key Players
1. Host → the animal or plant on which another organism lives

5. Symbiotic Relationships
Key Players
2. Symbiont/Symbiote → organism that lives on a host—receives a benefit from the host;
ex: food, protection, transport

6. Can you identify the host and the symbiote?

7. Symbiotic Relationships
The host and symbiote can affect each other in 3 different ways:
1. Benefit
(help)

8. Symbiotic Relationships
The host and symbiote can affect each other in 3 different ways:
2. Harm
(hurt)

9. Symbiotic Relationships
The host and symbiote can affect each other in 3 different ways:
3. unaffected
(does not help
or harm)

10. Types of Symbiotic Relationships
Commensalism
Definition
Symbiote – benefits
Host – unaffected (no harm, no benefit)

11. Barnacles on a clam shell
Mites on Dragonfly
Ex: Commensalism
Birds nesting in tree
Barnacles on a clam shell
Epiphytes on Tree

12. Types of Symbiotic Relationships
Mutualism
Mutual = BOTH
“The feeling is mutual”
Definition
Symbiote – benefits
Host – benefits

13. Crocodile & Crocodile Bird
Bacteria in gut
Pollinator & Plant
Ex: Mutualism
Cleaner Fish & Eel
Crocodile & Crocodile Bird
Clown fish & Anemone

14. Types of Symbiotic Relationships
Parasitism
Definition
Symbiote – benefits
Host – is harmed

15. Tapeworm in Intestines
Mosquito Feeding on Human Blood
Tapeworm in Intestines
Tick

16. Giardia—protist parasite (causes serious diarrhea!)
Dracunculus
Pubic or “Crab” Lice
Loa Loa Worm
Giardia—protist parasite (causes serious diarrhea!)