Lecture 15

Question 1

Succession

Answer 1

directional change in species composition over time as a result of abiotic and biotic agents of change

Question 2

Types of succession

Answer 2

primary
secondary

Question 3

Primary Succession

Answer 3

colonization of habitats devoid of life

Question 4

Secondary Succession

Answer 4

re-establishment of a community in which some, but not all, organisms have been destroyed

Question 5

Models of succession

Answer 5

facilitation model
tolerance model
inhibition model

Question 6

Facilitation Model

Answer 6

early species modify the environment in ways that benefit later species

Question 7

Tolerance Model

Answer 7

early species modify the environment in neutral ways that neither benefit not inhibit later species

Question 8

Inhibition Model

Answer 8

assumes early species modify conditions in negative ways that hinder later successional species

Question 9

Alternative Stable States

Answer 9

different communities follow different successional paths; develop in the same area under similar environmental conditions

Question 10

Hysteresis

Answer 10

if a community changes too much, it might not be able to return to its original state, even if original conditions are restored