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3.3 Community Interactions
Biology Notes
Community Interactions:
 Organisms interact with each other when they share the same ___________________________ or
________________________.
Types of Interactions:
1. Competition: organisms attempt to use a ________________________________ at the same time in
the same place:
a. Give examples of a “resource”
b. Give example of competing organisms:
2. _______________________________: one organism (____________________) captures & kills
another organism (____________________)
a. Give an example:
3. Define symbiosis:
a. _____________________________________: both species benefit from the relationship
i. Describe each of the following relationships:
Bee & Flowers
Organism
Benefit
Birds & Buffalo
Organism
Benefit
b. ______________________________________: one species benefits, one is unaffected.
Barnacle & Whale
Organism
Orchid & Tree
Benefit
Organism
Benefit
c. ____________________________________: one species (______________________________)
feeds on, but does not kill, another organism (______________________)
i. Ex: a tick (_________________________) on a deer (_______________________)
ii. Ex: tapeworms (__________________________) in animal’s intestines (_____________)
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3.3 Community Interactions
Biology Notes
Species Interactions
Part A: Chart
Directions: Using the definitions from your notes, use the following symbols to describe the
interactions between organisms in each type of species interaction.
+ = organism benefits
- = organism is harmed
0 = organism neither benefits nor is harmed (neutral)
Interaction
Organism #1
Organism #2
Parasitism
+
-
Predation
Competition
Mutualism
Commensalism
Part B: Scenarios
Directions: Read through each scenario and determine whether it is a case of parasitism, predation, competition,
mutualism, commensalism. In COMPLETE SENTENCES, explain the reasoning behind each choice.
1. Shrimp and Sea Anemone: The shrimp is immune to the stinging tentacles of the sea anemone.
By hiding in the sea anemone, the shrimp is protected from predators.
Interaction: ____________________________
2. Cattle Egrets and Livestock: As they graze, cattle stir up insects, which are eaten by the cattle egrets.
Interaction: ____________________________
3. Tapeworm and Dog: The tapeworm attaches to the intestinal wall of the dog and takes nutrients consumed
by the dog.
Interaction: ____________________________
4. Ant and Acacia Tree: The ant burrows into a thorn of the acacia tree to live and eats sugar secreted by the tree. The
ants often attacks other organisms that attempt to eat the tree.
Interaction: ____________________________
5. Cleaner Fish and Shark: The cleaner fish feeds on parasites in the shark's mouth and gills.
Interaction: ____________________________
6.
Tick and Cow: The tick burrows into the cow's skin to suck blood.
Interaction: ____________________________
7. Komodo Dragon and Water Buffalo: The komodo dragon bites a water buffalo to inject it with venom. About 1
week later, the water buffalo dies of poisoning and is eaten by the komodo dragon.
Interaction: ____________________________
8. Tigers and Golden Jackals: Lone golden jackals often follow tigers to feed on the tiger’s kills once the tiger has
finished eating.
Interaction: ___________________________
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