Why is there an annual flux in the graph?
Agenda for
1.Species relationships

Symbiotic relationships
• Symbiosis
– Mutualism (+ +)
– Commensalism (+ 0)
– Antagonism (+ -)
• Parasitism
• Predation
• Competition
– Amensalism (- 0)

Predation
• One individual (predator) captures, kills, and consumes another individual (prey)
Common Defenses Against Predation
• Flight
• Mimicry
• Camouflage
• Chemicals/Physical Structures
• Bright Colors

Competition
• Niche Overlap - use of same limited resources by two species
– Too many organisms in an area
– Water during a drought
– Overpopulation
• One organism better uses a resource leaving less for other species

Mutualism
• Both species benefit
– Pollination

Parasitism
• One individual is harmed and one benefits
• Parasite feeds on the host
– No immediate death

Commensalism
• One species benefits and the other is not affected

Ammensalism
• one species is harmed or inhibited and the other species is unaffected
– shading out of one plant by a taller and wider one
– the inhibition of one plant by the secretions of another

Species Interactions
Symbiotic Relationship Species 1
Mutualism
Commensalism
+
Benefits
+
Benefits
Antagonism (Parasitism
& predations)
+
Benefits
Ammensalism
-
Harmed
Species 2
+
Benefits
0
Neutral
-
Harmed
0
Neutral

What is happening in the graph?
Agenda for Thursday Oct 4 th
1. Finish lab
2. Review Stuff
TEST TOMORROW