Chapter 7: Density Dependence Flashcards
1
Q
two types of density dependence
A
- negative density dependence
- positive density dependence
2
Q
possible causes of negative density dependence
A
- intraspecific competition
- disease
- predation
3
Q
negative density dependence is …
A
stabilizing
4
Q
negative density dependence is stabilizing
A
can help pull a population towards an equilibrium size range
5
Q
another name for equilibrium size range
A
K or carrying capacity
6
Q
K or carrying capacity
A
- when population is at K, r is approx 0
- it is a range, not a single value
7
Q
what is K affected by
A
- density dependence
- external density independent factors
8
Q
positive density dependence
A
- vital rates &/or population growth rates increase as density increases
- destabilizing
9
Q
positive density dependence: destabilizing
A
pushes big populations to get bigger, small populations to get smaller
10
Q
positive density dependence at low population numbers
A
positive density dependence = allee effect
11
Q
mating and caring for young mechanisms
A
- mate limitation
- cooperative breeding
12
Q
foraging advantages mechanisms
A
- detection and access to food
- cooperative feeding
13
Q
predator mediated mechanisms
A
- predator detection/confusion/defense
- predation rate changes with prey numbers
