6. Population Growth
Measure the size of a population, which can be affected by three factors.
I. The number of births
II. The number of deaths
III. The number of individuals that enter or leave the population
Remember, population doesn't count the number of individuals within an...
1. Population biology studies the interaction between populations and their
environment.
2. The three most important characteristics of a population area…
a. It's geographic distribution
b. It's population density
c. It's growth rate
3. Population density refers to the number of individuals of the same species within a
defined area
4. Which side would have a higher density? (In the space below, draw out the outline as
presented) (PICTURE IS MISSING)
, 5. In the space below, draw out the outline of a population dispersion as shown
6. Population Growth
a. Measure the size of a population, which can be affected by three factors.
I. The number of births
II. The number of deaths
III. The number of individuals that enter or leave the population
1. Remember, population doesn't count the number of individuals within an entire
species, just the number in a given area!
b. Populations simply grow when the birth rate exceeds the death rate
c. If the death rate is greater than the birthrate, the population shrinks
d. External factors such as immigration and emigration can also affect population
I. Immigration is the movement of individuals into an area, a factor that can
cause populations to grow
II. Emigration is the movement of individuals out of an area a factor that can
cause populations to decline
e. Draw out the diagrams of immigration and emigration below with respect to the two
“nations” of chemistry and biology.(PICTURE IS MISSING)
f. If a population has abundant space and food and is protected from predators and
diseases, then that population will increase
I. For example, the bacteria reproduce by splitting in half.
II. Suppose there was one bacterial cell with an abundance of food, resources, and unlimited
living space.
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