Textbook: Chapter 18 - Factors Influencing the Structure of Communities

Question 1

Apparent Competition

Answer 1

Occurs whena single species of predator feeds ont wo prey species supporting a higher predator density, increasing the rate at which prey are consumed. As a result, the density of both prey species is lowered, suggesting a competitive interaction

Question 2

Bottom-up control

Answer 2

Influence of producers on the trophic levels above them in a food web

Question 3

Keystone predation

Answer 3

Predation that is central to the organization of a community; the predator enhances one or more inferior competitors by reducing the abundance of the superior competitor.

Question 4

Null model

Answer 4

Assumes that the presence and abundance of the individual species found in a given community are solely a result of the independent repsonses of each individual species to the prevailing physical environment

Question 5

Top-down control

Answer 5

Influence of predators on the structure of lower trophic levels in a food web.