1. Chapter #13 – Interspecific Competition
(pg. 258 – 280)

2. Chapter #13 – Interspecific Competition
(pg. 258 – 280)
13.1 – Interspecific Competition Involves Two or More Species.
13.2 – There Are Four Possible Outcomes of Interspecific Competition.
13.3 – Laboratory Experiments Support the Lotka-Volterra Equations.
13.4 – Studies Support the Competitive Exclusion Principle.
13.5 – Competition is Influenced by Nonresource Factors.
13.6 – Temporal Variations in the Environment Influences Competitive Interactions.
13.7 – Competition Occurs for Multiple Resources.
13.8 – Relative Competitive Abilities Change Along Environmental Gradients.
13.9 – Interspecific Competition Influences the Niche of a Species.
13.10 – Coexistence of Species Often Involves Partitioning Available Resources.
13.11 – Competition Can Influence Natural Selection.
Competition is a Complex Interaction Involving Both Biotic and Abiotic Factors.

3. Chapter #13 – Interspecific Competition
(pg. 258 – 280)
13.1 – Interspecific Competition Involves Two or More Species.
Six different types of interactions:
Consumption (of a shared resource)
Preemption (sessile – occupation precludes establishment)
Over-growth (plants – when one overgrows another)
Chemical Interaction (released chemicals inhibit or kill)
Territoriality (behavioral exclusion)
Encounter (Non-territorial meetings w/negative effects)

4. Chapter #13 – Interspecific Competition
(pg. 258 – 280)
13.2 – There Are Four Possible Outcomes of Interspecific Competition.
Logistic Growth Equation for 1 species: dN Dt = rN
(K – N) K

5. Chapter #13 – Interspecific Competition
(pg. 258 – 280)
13.2 – There Are Four Possible Outcomes of Interspecific Competition.
Logistic Growth Equation for 2 species:
Species Species 2 rN
(K – N) K = rN
(K – N) K

6. Chapter #13 – Interspecific Competition
(pg. 258 – 280)
13.2 – There Are Four Possible Outcomes of Interspecific Competition.
Logistic Growth Equation for 2 species:
Species Species 2 rN
(K – N) K = rN
(K – N) K
β – competition coefficient of sp. #1 on sp. #2.
α – competition coefficient of sp. #2 on sp. #1.

7. Chapter #13 – Interspecific Competition
(pg. 258 – 280)
13.2 – There Are Four Possible Outcomes of Interspecific Competition.
Logistic Growth Equation for 2 species:
Species 1
dN1 dt =
r1N1
(K1 – N1 – αN2) K1
α – competition coefficient of sp. #2 on sp. #1.

8. Chapter #13 – Interspecific Competition
(pg. 258 – 280)
13.2 – There Are Four Possible Outcomes of Interspecific Competition.
Zero Growth
Isoclines

9. Chapter #13 – Interspecific Competition
(pg. 258 – 280)
13.2 – There Are Four Possible Outcomes of Interspecific Competition.
Lotka-Volterra Model for Competition
Vittora Volterra
Alfred Lotka

10. Chapter #13 – Interspecific Competition
(pg. 258 – 280)
13.2 – There Are Four Possible Outcomes of Interspecific Competition.
Lotka-Volterra Model for Competition

11. Chapter #13 – Interspecific Competition
(pg. 258 – 280)
13.3 – Laboratory Experiments Support the Lotka-Volterra Equations.
G. F. Gause

12. Chapter #13 – Interspecific Competition
(pg. 258 – 280)
13.2 – There Are Four Possible Outcomes of Interspecific Competition.
David Tilman

13. The Competitive Exclusion Principle:
Chapter #13 – Interspecific Competition
(pg. 258 – 280)
13.4 – Studies Support the Competitive Exclusion Principle.
13.2 – There Are Four Possible Outcomes of Interspecific Competition.
The Competitive Exclusion Principle:
“Complete Competitors cannot Coexist”
2 species
Non-interbreeding populations
Live in the sample and time
Possess exactly the same ecological requirements

14. Chapter #13 – Interspecific Competition
(pg. 258 – 280)
13.5 – Competition is Influenced by Nonresource Factors.

15. Chapter #13 – Interspecific Competition
(pg. 258 – 280)
13.6 – Temporal Variations in the Environment Influences Competitive Interactions.