FINAL EXAM - Interactions

Question 1

Symbiosis

Answer 1

“Together-living”
- Typically used to refer to any physically close association between two species, whether good, bad, or neutral

Question 2

Commensalism

Answer 2

”+/0”
- Population size & range of commensalism may depend on population size & distribution on host
- Strong selection on commensalism to increase fitness benefits in relationship; no selection on host
- Least studied

Question 3

Competition

Answer 3

”-/-“
- Reduces population size of both species; if competition is asymmetric, the weaker competitor may become locally extinct
- Niche differentiation via selection to reduce competition
- Lowers fitness of both individuals involved

Question 4

Consumption

Answer 4

”+/-“
- Impact on prey population depends on predator density
- Strong selection on prey for effective defenses; strong selection on consumers
- When one organism eats pars of all of another

Question 5

Mutualism

Answer 5

”+/+”
- Population size & range of each species defend on other species
- Strong selection on both species maximize fitness benefits

Question 6

Resource Use Efficiency

Answer 6

Limiting competition through niche partitioning; As you increase biodiversity, you are increasing the efficiency at which the limited resources are being used

Question 6

Sampling Effect

Answer 6

Random Chance - Super Producer

Question 7

Facilitation

Answer 7

Mutualism
- As you increase the number of species, you increase the chance that these two species are going to start helping each other