Chapter 18: Community Structure Flashcards
0
Q
What is a community?
A
An assemblage of species occurring in one place
1
Q
What is an ecotone?
A
Regions of rapid replacement of species along a gradient
2
Q
What types of communities are separated by ecotones?
A
Closed communities
3
Q
What type of community has species distributed independently across an environmental gradient?
A
Open communities
4
Q
Describe top-down control
A
Consumers depress the tropic level on which they feed, indirectly increasing the next lower level.
5
Q
Describe bottom-up control.
A
Increased production results in greater productivity in all higher tropic levels.
