quiz 5 Ch 17

Question 1

type of community webs

Answer 1

food web

Question 2

food webs

Answer 2

summarize feeding relationship in community

Question 3

Winemillers ways of representing a web

Answer 3

only common species

exclude weakest trophic level

Question 4

strong interactions

Answer 4

feeding activities of few species may have a dominant influence on community structure

Question 5

direct interaction

Answer 5

direct impact of one individual on another when not mediated or transmitted through a third individual

Question 6

indirect interactions

Answer 6

impact of one organism or species on another that is mediated or transmitted by a third

Question 7

keystone species

Answer 7

influence community structure more than expected given its biomass

Question 8

keystone predators

Answer 8

decrease competitive exclusion and increase number of coexisting species

Question 9

Paine’s predation

hypothesis

Answer 9

high numbers of predators produce high pressure on prey population which promotes high diversity on sub tropical intertidal zone

Question 10

Paine’s predation

result

Answer 10

increase number of species also increase number of predator species

increase predation pressure, increases predation pressure, which then increases diversity

Question 11

lubchenco: herbivore effects of plant diversity

prediction

Answer 11

need to know: food preference,
plant competitive relationship, and variation in feeding preferences and competitive relationships across environments

looked at littorina (snail)

Question 12

lubchenco: herbivore effects of plant diversity

result

Answer 12

prefers green algae, green usually out competes red algae in tide pools when littering is not present.
green crabs eat snail juveniles, and decrease their numbers