Ecology Flashcards
1
Q
Ecology
A
- Interactions of organisms with either environment
- Biotic
- Abiotic
2
Q
Population
A
group of individuals of single species that occupy the same area
3
Q
Individuals in a pop
A
- Rely on the same resources
- influenced by the same environmental factors
- likely to interact and breed with one another
4
Q
Population ecology
A
- changes in population size
- factors that regulate populations over time
5
Q
Populations increase/decrease through
A
- birth/immigration
- death/emigration
6
Q
Factors affecting population size
A
- habitat quality
- habitat quantity
- dispersal patterns
- degree of habitat fragmentation
7
Q
Population growth model
A
Nt+1 = Nt + B - D + I - E
- Births
- Deaths
- Immigrants
- Emigrants
8
Q
Population Growth Model if Pop. closed
A
Nt+1 = Nt + B - D
∆N = G = B - D
b = births/individual•time
d -
9
Q
Difference between birth and death rates
A
r=b-d
10
Q
Exponential Growh Formula
A
G=rN
11
Q
Demographic Transition
A
- Shift from high birth and death rates to low
- Lowered rate of growth in developed countries
12
Q
Demographic transition in developing nations
A
- Death rates dropped, birth rates high
- Pop. growing rapidly
13
Q
Why can’t populateions increase exponentialy w/o bound?
A
Resources are limited
14
Q
Logistic growth includes
A
Carrying capacity
15
Q
Logistic growth formula
A
G=rN(K-N)/K
K-carrying capacity
