33: ecology II

Question 1

what classifies community interactions?

Answer 1

if they help, harm, or have no effect on the species involved

Question 2

what characterizes biological communities?

Answer 2

diversity and trophic structure

Question 3

interspecific interactions include?

Answer 3

• competition
• predation
• herbivory
• symbioses

Question 4

community ecology

Answer 4

the study of the effect of interspecific interactions on community structure and organization

Question 5

3 types of symbiosis

Answer 5

• parasitism (+/-)
• mutualism (+/+)
• commensalism (+/0)

Question 6

what strongly influences community structure?

Answer 6

all interactions

Question 7

exploitative interspecific competition

Answer 7

indirect interaction

Question 8

interference interspecific competition

Answer 8

direct interaction

Question 9

competition exclusion principle

Answer 9

2 species competing for the same limiting resources cannot coexist

Question 10

resource partitioning

Answer 10

niches differentiate to allow coexistence

Question 11

character displacement

Answer 11

evolution of traits due to competition

Question 12

asymmetric competition

Answer 12

restrictions within the niche

Question 13

obligate mutualism

Answer 13

one/both species has lost ability to survive without partner

Question 14

facultative mutualism

Answer 14

both species can survive on their own

Question 15

why is diversity good?

Answer 15

• more productive
• more stable productivity across years
• more stable community structure
• more resistant to invasive species

Question 16

trophic structure

Answer 16

the feeding relationships among species in a community

Question 17

trophic level

Answer 17

species groups deriving food/energy from a similar source