Populations Flashcards
0
Q
Abiotic factors
A
Nonliving chemical and physical factors
1
Q
Ecology
A
The scientific study of the interactions between organisms and the environment
2
Q
Biotic factors
A
Living factors
3
Q
Four levels of ecological study
A
Individuals
Populations
Communities
Ecosystems
4
Q
How do population biologists determine the number of individuals in a population?
A
- Census- count every individual
2. Sampling- mark/recapture
5
Q
Population density?
Why is it important?
A
- Number of individuals of a species per unit space
2. As density increases, competition for resources increases
6
Q
What are the three dispersion patterns?
A
- Clumped- patchy reassures or social interactions. Most common
- Uniform- territorially
- Random- uniform resources. Least common. Trees
7
Q
What process increases population size?
A
- Birth
2. Immigration
8
Q
What process decreases population size?
A
- Death
2. Moving
9
Q
Carrying capacity
A
Number of individuals in a population that the environment can sustain
- More deaths and less births- population decreases
