Marine Bio- Day 5&6
 Drill: What are some abiotic and biotic factors that would
affect organisms in a salt water fish tank?
 Outcome: Define the different relationships between
marine organisms. Compare marine symbiotic
relationships.
 Agenda:
 Discuss interactions between marine organisms
 Begin Aquarium Project
Competition
 What is Competition?
 When two or more species compete
for the same resource.

Ex. Living space, food, mates, light
 There are two types of competition:
 Intraspecific - within one species
 Interspecific - between species
Competitive Exclusion
 What is Competitive Exclusion?
 When a less successful species is replaced by a more
successful one.
 This happens often when an invasive species appears.
Symbiosis
 Symbiosis - ecological relationship between the
individuals of two (or more) different species
 Four examples of symbiosis:
1) Parasitism – One benefits, the other is harmed (+ , - )
2) Commensalism – One benefits, the other is neither helped
nor harmed ( + , O )
3) Mutualism – Both benefit ( + , + )
4) Predator/Prey – One hunts and kills the other (+ , - )
Parasitism Examples
Cymothoid isopod and
a snapper fish
Grouper Fish with a parasite
Commensalism
Examples
Remora fish
Pearl fish and a sea cucumber
Shark with a remora fish
Mutualism Examples
Boxer Crab and anemone
Clown Fish and anemone
Predator/Prey Examples
Orcas and seal
Great White and seal
Symbiotic Worksheet
 Read the 6 scenarios and determine if they are M:
Mutualism, P: Parasitism, or C: Commensalism
 On the back explain why you chose each answer.
Aquarium Project
 When finished place in the turn in bin and pick up a rubric
and information sheet for the Aquarium Project
 Look over the rubric and be ready to discuss the project