Focus is on more than one species
an association of interacting species living in a particular area
The struggle among organisms for vital resources (i.e. food, space, mate)
Types of Competition
Intraspecific competition & Interspecific competition
competition between organisms of different species
competition between organisms of the same species
6 Types of Interactions that lead to Interspecific Competition
1. Consumption 2. Overgrowth 3. Preemption 4. Territorial 5. Encounter 6. Chemical
Consumption and Overgrowth interactions are considered what type of interspecific competition?
Preemption, Territorial, Encounter, and Chemical interactions are considered what type of interspecific competition?
Four possible outcomes of Interspecific Competition
1. Species 1 wins 2. Species 2 wins 3. Competition can go either way 4. Coexistence
Logistic Growth Equation
What equation is used for Intraspecific Competition?
Logisitic growth curve
What equation is used for Interspecific Competition?
a12N2 represents what?
the relative level of interspecific competition
K1-N1 represents what?
the relative level of intraspecific competition
the competition coefficient
What determines the outcome of competition?
differences in alpha and N
What would the value of a12 have to be if the effect of each individual of species 2 is less than the effect of each individual of species 1?
What would the value of a12 have to be if the effect of each individual of species 2 is more than the effect of each individual of species 1?
What must happen for Coexistence to be possible?
interspecific competition is weaker than intraspecific competition
Competition Exclusion Principal
two species cannot coexist if they are in the same location and have the same fundamental niche and require the exact same resources
Competitive Exclusion Principle: What causes the abundances of the different species to diverge over time?
differences in the competitive ability of the different species
Competitive Exclusion Principle: What is meant by "exclusion"?
one species becomes more common while the other bocomes less common (excluded)
Competitive Exclusion Principle: What determines the time it takes for one species to be excluded?
the differences in abilities
What is Competitive Exclusion the result of?
How do seemingly similar species coexist?
Habitiat/resource partitioning (splitting up the resource "pie")
same resource used diffenetly be species in coexistence
use of different resources between species in coexistence
When competition causes shifts in a species morphology, physiology, or behavior