1. Warm-Up
(S7L4e) All organisms that live in marine biomes are adapted to:
A. freshwater
B. salty water
C. water that fluctuates between fresh and salty
D. environments that fluctuate between wet and dry
octopus-vsShark.wmv

2. S7L4 How do we identify predator/prey and symbiotic relationships?
Students will examine the dependence of organisms on one another and their environments.
c. Categorize relationships between organisms that are competitive or mutually beneficial.

3. Gross…but it can happen to you!

4. Symbiotic Relationships:
Symbiosis: living together with another organism in close association
Types of (symbiosis):
MUTUALISM PARASITISM COMMENSALISM

5. Commensalism: one organism is benefited and the other is unharmed
ex. barnacles on whales, orchids on tropical trees

6. 2. Mutualism: both organisms benefit from the association

7. 3. Parasitism: the parasite benefits at the expense of the host
ex. athlete's foot fungus on humans, tapeworm and heartworm in dogs

8. Symbiosis Mutualism- both species benefit (+/+)
Examples: bacteria in digestive track, plover (bird) & crocodile , remora and shark
Commensalism- one member benefits, the other is not helped nor harmed (+/=)
Examples: sparrows and wrens building nest near a hawk
Orchids & bromeliads live in the tops of the trees in rain forest
Mites living at the base of eyebrows
Parasitism- one organism lives off the other organism while harming it (+/-)
Examples: ticks, fleas, mosquitos, heartworm, leeches,
Symbiosis with video links :: Symbiotic Relationships

9. Commensalism, Mutualism, or Parasitism
Acacia ants live on the bullhorn acacia tree, which provides the ants with food and shelter. The ants deter grazing animals from eating the tree.
Who are the two players in the relationship?
What type of relationship is it?
Mutualism

10. Commensalism, Mutualism, or Parasitism
Plants called epiphytes, such as certain orchids, live on other plants, which provide only a place to grow. Epiphytes absorb sunlight, water, and nutrients from their surroundings and make their own food.
Who are the two players in the relationship?
What type of relationship is it?
Commensalism

11. Commensalism, Mutualism, or Parasitism
There is a tiny wasp that lays eggs in a variety of other insects, such as caterpillars, spiders, aphids, and flies. The wasp larvae feed on the host insect and eventually kill it.
Who are the two players in the relationship?
What type of relationship is it?
Parasitism

12. Commensalism, Mutualism, or Parasitism
A young girl visiting her grandmother. The girl has noticed how her grandmother struggles to bend down to get things out of the lower cupboards. The girls then decides to assist her grandmother while collecting utensil as they prepare dinner. As the girl is helping, the grandmother notices the girl does not know some of the proper name of the utensils. The grandmother makes a game out of learning the utensils and then makes a song. The two worked together to prepare a meal. Grandma had help getting utensils, and it was a learning experience for the young girl.

13. Commensalism, Mutualism, or Parasitism
You are seated in class near a student. You do not “hang out” with this student, but you make conversation with him when he is there. When he is in school, you do not benefit from him anyway. You are smarter, you are self motivated, and you are social with others without him. When he is not there, you do not miss him. He, on the other hand, returns from an absence and tells you he missed you. He always wants to be your partner and without you in the room, he does not socialize with others. He frequently asks you to help him and asks you to check his progress on activities.

14. Commensalism, Mutualism, or Parasitism
You are walking through the woods and the tick bites you. The ticks is carrying the rocky Mountain Spotted Fever bacteria. The bacteria are transferred to you as long as the tick remains attached to your body as the ticks suck blood to feed itself. You find the tick and remove it, thinking nothing has happened. Within one month, you begin to see a rash around the bite site and begin to run a fever. You become very sick.
symbiotic-impaled-grossbugremoval.wmv

15. Homework Complete vocabulary on page 490 Interactive textbook 301-308
Complete worksheet